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81fe123040
busybox/shell/ash.c
Eric Andersen 81fe123040 Vladimir N. Oleynik writes: 
Last patch have synced form Manuel Nova III xxreadtoken() function,
corrected (C) form dash debian/copyright, removed my small mistake
with IFS_BROKEN (thanks by Herbert), and synced cmdedit.c from
current CVS (removed libc5 support, your email correction, my (C) year
corertion).
2003-07-29 06:38:40 +00:00

12743 lines
258 KiB
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/* vi: set sw=4 ts=4: */
/*
* ash shell port for busybox
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2003 Herbert Xu <herbert@debian.org>
* was re-ported from NetBSD and debianized.
*
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* Modified by Vladimir Oleynik <dzo@simtreas.ru> to be used in busybox
*
*
* Original BSD copyright notice is retained at the end of this file.
*/
/*
* The follow should be set to reflect the type of system you have:
* JOBS -> 1 if you have Berkeley job control, 0 otherwise.
* define SYSV if you are running under System V.
* define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
* define DEBUG=2 to compile in and turn on debugging.
*
* When debugging is on, debugging info will be written to ./trace and
* a quit signal will generate a core dump.
*/
#define IFS_BROKEN
#define PROFILE 0
#ifdef DEBUG
#define _GNU_SOURCE
#endif
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <stddef.h>
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <paths.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <sysexits.h>
#include <fnmatch.h>
#include <glob.h>
#include "busybox.h"
#include "pwd_.h"
#ifdef CONFIG_ASH_JOB_CONTROL
#define JOBS 1
#else
#undif JOBS
#endif
#if JOBS
#include <termios.h>
#endif
#include "cmdedit.h"
#ifdef __GLIBC__
/* glibc sucks */
static int *dash_errno;
#undef errno
#define errno (*dash_errno)
#endif
#if defined(__uClinux__)
#error "Do not even bother, ash will not run on uClinux"
#endif
#ifdef DEBUG
#define _DIAGASSERT(assert_expr) assert(assert_expr)
#else
#define _DIAGASSERT(assert_expr)
#endif
#ifdef CONFIG_ASH_ALIAS
/* $NetBSD: alias.h,v 1.5 2002/11/24 22:35:38 christos Exp $ */
#define ALIASINUSE 1
#define ALIASDEAD 2
struct alias {
struct alias *next;
char *name;
char *val;
int flag;
};
static struct alias *lookupalias(const char *, int);
static int aliascmd(int, char **);
static int unaliascmd(int, char **);
static void rmaliases(void);
static int unalias(const char *);
static void printalias(const struct alias *);
#endif
/* $NetBSD: cd.h,v 1.3 2002/11/24 22:35:39 christos Exp $ */
static void setpwd(const char *, int);
/* $NetBSD: error.h,v 1.15 2002/11/24 22:35:39 christos Exp $ */
/*
* Types of operations (passed to the errmsg routine).
*/
static const char not_found_msg[] = "%s: not found";
#define E_OPEN "No such file" /* opening a file */
#define E_CREAT "Directory nonexistent" /* creating a file */
#define E_EXEC not_found_msg+4 /* executing a program */
/*
* We enclose jmp_buf in a structure so that we can declare pointers to
* jump locations. The global variable handler contains the location to
* jump to when an exception occurs, and the global variable exception
* contains a code identifying the exeception. To implement nested
* exception handlers, the user should save the value of handler on entry
* to an inner scope, set handler to point to a jmploc structure for the
* inner scope, and restore handler on exit from the scope.
*/
struct jmploc {
jmp_buf loc;
};
static struct jmploc *handler;
static int exception;
static volatile int suppressint;
static volatile sig_atomic_t intpending;
static int exerrno; /* Last exec error, error for EXEXEC */
/* exceptions */
#define EXINT 0 /* SIGINT received */
#define EXERROR 1 /* a generic error */
#define EXSHELLPROC 2 /* execute a shell procedure */
#define EXEXEC 3 /* command execution failed */
#define EXEXIT 4 /* exit the shell */
#define EXSIG 5 /* trapped signal in wait(1) */
/* do we generate EXSIG events */
static int exsig;
/* last pending signal */
static volatile sig_atomic_t pendingsigs;
/*
* These macros allow the user to suspend the handling of interrupt signals
* over a period of time. This is similar to SIGHOLD to or sigblock, but
* much more efficient and portable. (But hacking the kernel is so much
* more fun than worrying about efficiency and portability. :-))
*/
#define barrier() ({ __asm__ __volatile__ ("": : :"memory"); })
#define INTOFF \
({ \
suppressint++; \
barrier(); \
0; \
})
#define SAVEINT(v) ((v) = suppressint)
#define RESTOREINT(v) \
({ \
barrier(); \
if ((suppressint = (v)) == 0 && intpending) onint(); \
0; \
})
#define EXSIGON() \
({ \
exsig++; \
barrier(); \
if (pendingsigs) \
exraise(EXSIG); \
0; \
})
/* EXSIG is turned off by evalbltin(). */
static void exraise(int) __attribute__((__noreturn__));
static void onint(void) __attribute__((__noreturn__));
static void error(const char *, ...) __attribute__((__noreturn__));
static void exerror(int, const char *, ...) __attribute__((__noreturn__));
static void sh_warnx(const char *, ...);
#ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
static void
inton(void) {
if (--suppressint == 0 && intpending) {
onint();
}
}
#define INTON inton()
static void forceinton(void)
{
suppressint = 0;
if (intpending)
onint();
}
#define FORCEINTON forceinton()
#else
#define INTON \
({ \
barrier(); \
if (--suppressint == 0 && intpending) onint(); \
0; \
})
#define FORCEINTON \
({ \
barrier(); \
suppressint = 0; \
if (intpending) onint(); \
0; \
})
#endif /* CONFIG_ASH_OPTIMIZE_FOR_SIZE */
/*
* BSD setjmp saves the signal mask, which violates ANSI C and takes time,
* so we use _setjmp instead.
*/
#if defined(BSD) && !defined(__SVR4) && !defined(__GLIBC__)
#define setjmp(jmploc) _setjmp(jmploc)
#define longjmp(jmploc, val) _longjmp(jmploc, val)
#endif
/* $NetBSD: expand.h,v 1.13 2002/11/24 22:35:40 christos Exp $ */
struct strlist {
struct strlist *next;
char *text;
};
struct arglist {
struct strlist *list;
struct strlist **lastp;
};
/*
* expandarg() flags
*/
#define EXP_FULL 0x1 /* perform word splitting & file globbing */
#define EXP_TILDE 0x2 /* do normal tilde expansion */
#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
#define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
#define EXP_WORD 0x80 /* expand word in parameter expansion */
#define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
union node;
static void expandarg(union node *, struct arglist *, int);
#define rmescapes(p) _rmescapes((p), 0)
static char *_rmescapes(char *, int);
static int casematch(union node *, char *);
#ifdef CONFIG_ASH_MATH_SUPPORT
static void expari(int);
#endif
/* $NetBSD: eval.h,v 1.13 2002/11/24 22:35:39 christos Exp $ */
static char *commandname; /* currently executing command */
static struct strlist *cmdenviron; /* environment for builtin command */
static int exitstatus; /* exit status of last command */
static int back_exitstatus; /* exit status of backquoted command */
struct backcmd { /* result of evalbackcmd */
int fd; /* file descriptor to read from */
char *buf; /* buffer */
int nleft; /* number of chars in buffer */
struct job *jp; /* job structure for command */
};
/*
* This file was generated by the mknodes program.
*/
#define NCMD 0
#define NPIPE 1
#define NREDIR 2
#define NBACKGND 3
#define NSUBSHELL 4
#define NAND 5
#define NOR 6
#define NSEMI 7
#define NIF 8
#define NWHILE 9
#define NUNTIL 10
#define NFOR 11
#define NCASE 12
#define NCLIST 13
#define NDEFUN 14
#define NARG 15
#define NTO 16
#define NCLOBBER 17
#define NFROM 18
#define NFROMTO 19
#define NAPPEND 20
#define NTOFD 21
#define NFROMFD 22
#define NHERE 23
#define NXHERE 24
#define NNOT 25
struct ncmd {
int type;
union node *assign;
union node *args;
union node *redirect;
};
struct npipe {
int type;
int backgnd;
struct nodelist *cmdlist;
};
struct nredir {
int type;
union node *n;
union node *redirect;
};
struct nbinary {
int type;
union node *ch1;
union node *ch2;
};
struct nif {
int type;
union node *test;
union node *ifpart;
union node *elsepart;
};
struct nfor {
int type;
union node *args;
union node *body;
char *var;
};
struct ncase {
int type;
union node *expr;
union node *cases;
};
struct nclist {
int type;
union node *next;
union node *pattern;
union node *body;
};
struct narg {
int type;
union node *next;
char *text;
struct nodelist *backquote;
};
struct nfile {
int type;
union node *next;
int fd;
union node *fname;
char *expfname;
};
struct ndup {
int type;
union node *next;
int fd;
int dupfd;
union node *vname;
};
struct nhere {
int type;
union node *next;
int fd;
union node *doc;
};
struct nnot {
int type;
union node *com;
};
union node {
int type;
struct ncmd ncmd;
struct npipe npipe;
struct nredir nredir;
struct nbinary nbinary;
struct nif nif;
struct nfor nfor;
struct ncase ncase;
struct nclist nclist;
struct narg narg;
struct nfile nfile;
struct ndup ndup;
struct nhere nhere;
struct nnot nnot;
};
struct nodelist {
struct nodelist *next;
union node *n;
};
struct funcnode {
int count;
union node n;
};
static void freefunc(struct funcnode *);
/* $NetBSD: parser.h,v 1.15 2002/11/24 22:35:42 christos Exp $ */
/* control characters in argument strings */
#define CTL_FIRST '\201' /* first 'special' character */
#define CTLESC '\201' /* escape next character */
#define CTLVAR '\202' /* variable defn */
#define CTLENDVAR '\203'
#define CTLBACKQ '\204'
#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
/* CTLBACKQ | CTLQUOTE == '\205' */
#define CTLARI '\206' /* arithmetic expression */
#define CTLENDARI '\207'
#define CTLQUOTEMARK '\210'
#define CTL_LAST '\210' /* last 'special' character */
/* variable substitution byte (follows CTLVAR) */
#define VSTYPE 0x0f /* type of variable substitution */
#define VSNUL 0x10 /* colon--treat the empty string as unset */
#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
/* values of VSTYPE field */
#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
#define VSMINUS 0x2 /* ${var-text} */
#define VSPLUS 0x3 /* ${var+text} */
#define VSQUESTION 0x4 /* ${var?message} */
#define VSASSIGN 0x5 /* ${var=text} */
#define VSTRIMRIGHT 0x6 /* ${var%pattern} */
#define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
#define VSTRIMLEFT 0x8 /* ${var#pattern} */
#define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
#define VSLENGTH 0xa /* ${#var} */
/* values of checkkwd variable */
#define CHKALIAS 0x1
#define CHKKWD 0x2
#define CHKNL 0x4
#define IBUFSIZ (BUFSIZ + 1)
/*
* NEOF is returned by parsecmd when it encounters an end of file. It
* must be distinct from NULL, so we use the address of a variable that
* happens to be handy.
*/
static int plinno = 1; /* input line number */
/* number of characters left in input buffer */
static int parsenleft; /* copy of parsefile->nleft */
static int parselleft; /* copy of parsefile->lleft */
/* next character in input buffer */
static char *parsenextc; /* copy of parsefile->nextc */
static struct parsefile basepf; /* top level input file */
static char basebuf[IBUFSIZ]; /* buffer for top level input file */
static struct parsefile *parsefile = &basepf; /* current input file */
static int tokpushback; /* last token pushed back */
#define NEOF ((union node *)&tokpushback)
static int parsebackquote; /* nonzero if we are inside backquotes */
static int doprompt; /* if set, prompt the user */
static int needprompt; /* true if interactive and at start of line */
static int lasttoken; /* last token read */
static char *wordtext; /* text of last word returned by readtoken */
static int checkkwd;
static struct nodelist *backquotelist;
static union node *redirnode;
static struct heredoc *heredoc;
static int quoteflag; /* set if (part of) last token was quoted */
static int startlinno; /* line # where last token started */
static union node *parsecmd(int);
static void fixredir(union node *, const char *, int);
static const char *const *findkwd(const char *);
static char *endofname(const char *);
/* $NetBSD: shell.h,v 1.16 2003/01/22 20:36:04 dsl Exp $ */
typedef void *pointer;
static char nullstr[1]; /* zero length string */
static const char spcstr[] = " ";
static const char snlfmt[] = "%s\n";
static const char dolatstr[] = { CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' };
static const char illnum[] = "Illegal number: %s";
static const char homestr[] = "HOME";
#ifdef DEBUG
#define TRACE(param) trace param
#define TRACEV(param) tracev param
#else
#define TRACE(param)
#define TRACEV(param)
#endif
#if defined(__GNUC__) && __GNUC__ < 3
#define va_copy __va_copy
#endif
#if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
#define __builtin_expect(x, expected_value) (x)
#endif
#define likely(x) __builtin_expect((x),1)
#define unlikely(x) __builtin_expect((x),0)
#define TEOF 0
#define TNL 1
#define TREDIR 2
#define TWORD 3
#define TSEMI 4
#define TBACKGND 5
#define TAND 6
#define TOR 7
#define TPIPE 8
#define TLP 9
#define TRP 10
#define TENDCASE 11
#define TENDBQUOTE 12
#define TNOT 13
#define TCASE 14
#define TDO 15
#define TDONE 16
#define TELIF 17
#define TELSE 18
#define TESAC 19
#define TFI 20
#define TFOR 21
#define TIF 22
#define TIN 23
#define TTHEN 24
#define TUNTIL 25
#define TWHILE 26
#define TBEGIN 27
#define TEND 28
/* first char is indicating which tokens mark the end of a list */
static const char *const tokname_array[] = {
"\1end of file",
"\0newline",
"\0redirection",
"\0word",
"\0;",
"\0&",
"\0&&",
"\0||",
"\0|",
"\0(",
"\1)",
"\1;;",
"\1`",
#define KWDOFFSET 13
/* the following are keywords */
"\0!",
"\0case",
"\1do",
"\1done",
"\1elif",
"\1else",
"\1esac",
"\1fi",
"\0for",
"\0if",
"\0in",
"\1then",
"\0until",
"\0while",
"\0{",
"\1}",
};
static const char *tokname(int tok)
{
static char buf[16];
if (tok >= TSEMI)
buf[0] = '"';
sprintf(buf + (tok >= TSEMI), "%s%c",
tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
return buf;
}
/* $NetBSD: machdep.h,v 1.10 2002/10/07 14:26:08 christos Exp $ */
/*
* Most machines require the value returned from malloc to be aligned
* in some way. The following macro will get this right on many machines.
*/
#define SHELL_SIZE (sizeof(union {int i; char *cp; double d; }) - 1)
/*
* It appears that grabstackstr() will barf with such alignments
* because stalloc() will return a string allocated in a new stackblock.
*/
#define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
/*
* This file was generated by the mksyntax program.
*/
/* Syntax classes */
#define CWORD 0 /* character is nothing special */
#define CNL 1 /* newline character */
#define CBACK 2 /* a backslash character */
#define CSQUOTE 3 /* single quote */
#define CDQUOTE 4 /* double quote */
#define CENDQUOTE 5 /* a terminating quote */
#define CBQUOTE 6 /* backwards single quote */
#define CVAR 7 /* a dollar sign */
#define CENDVAR 8 /* a '}' character */
#define CLP 9 /* a left paren in arithmetic */
#define CRP 10 /* a right paren in arithmetic */
#define CENDFILE 11 /* end of file */
#define CCTL 12 /* like CWORD, except it must be escaped */
#define CSPCL 13 /* these terminate a word */
#define CIGN 14 /* character should be ignored */
#ifdef CONFIG_ASH_ALIAS
#define SYNBASE 130
#define PEOF -130
#define PEOA -129
#define PEOA_OR_PEOF PEOA
#else
#define SYNBASE 129
#define PEOF -129
#define PEOA_OR_PEOF PEOF
#endif
#define is_digit(c) ((unsigned)((c) - '0') <= 9)
#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
/*
* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
* (assuming ascii char codes, as the original implementation did)
*/
#define is_special(c) \
( (((unsigned int)c) - 33 < 32) \
&& ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
#define digit_val(c) ((c) - '0')
/*
* This file was generated by the mksyntax program.
*/
#ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
#define USE_SIT_FUNCTION
#endif
/* number syntax index */
#define BASESYNTAX 0 /* not in quotes */
#define DQSYNTAX 1 /* in double quotes */
#define SQSYNTAX 2 /* in single quotes */
#define ARISYNTAX 3 /* in arithmetic */
#ifdef CONFIG_ASH_MATH_SUPPORT
static const char S_I_T[][4] = {
#ifdef CONFIG_ASH_ALIAS
{CSPCL, CIGN, CIGN, CIGN}, /* 0, PEOA */
#endif
{CSPCL, CWORD, CWORD, CWORD}, /* 1, ' ' */
{CNL, CNL, CNL, CNL}, /* 2, \n */
{CWORD, CCTL, CCTL, CWORD}, /* 3, !*-/:=?[]~ */
{CDQUOTE, CENDQUOTE, CWORD, CWORD}, /* 4, '"' */
{CVAR, CVAR, CWORD, CVAR}, /* 5, $ */
{CSQUOTE, CWORD, CENDQUOTE, CWORD}, /* 6, "'" */
{CSPCL, CWORD, CWORD, CLP}, /* 7, ( */
{CSPCL, CWORD, CWORD, CRP}, /* 8, ) */
{CBACK, CBACK, CCTL, CBACK}, /* 9, \ */
{CBQUOTE, CBQUOTE, CWORD, CBQUOTE}, /* 10, ` */
{CENDVAR, CENDVAR, CWORD, CENDVAR}, /* 11, } */
#ifndef USE_SIT_FUNCTION
{CENDFILE, CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */
{CWORD, CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */
{CCTL, CCTL, CCTL, CCTL} /* 14, CTLESC ... */
#endif
};
#else
static const char S_I_T[][3] = {
#ifdef CONFIG_ASH_ALIAS
{CSPCL, CIGN, CIGN}, /* 0, PEOA */
#endif
{CSPCL, CWORD, CWORD}, /* 1, ' ' */
{CNL, CNL, CNL}, /* 2, \n */
{CWORD, CCTL, CCTL}, /* 3, !*-/:=?[]~ */
{CDQUOTE, CENDQUOTE, CWORD}, /* 4, '"' */
{CVAR, CVAR, CWORD}, /* 5, $ */
{CSQUOTE, CWORD, CENDQUOTE}, /* 6, "'" */
{CSPCL, CWORD, CWORD}, /* 7, ( */
{CSPCL, CWORD, CWORD}, /* 8, ) */
{CBACK, CBACK, CCTL}, /* 9, \ */
{CBQUOTE, CBQUOTE, CWORD}, /* 10, ` */
{CENDVAR, CENDVAR, CWORD}, /* 11, } */
#ifndef USE_SIT_FUNCTION
{CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */
{CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */
{CCTL, CCTL, CCTL} /* 14, CTLESC ... */
#endif
};
#endif /* CONFIG_ASH_MATH_SUPPORT */
#ifdef USE_SIT_FUNCTION
#define U_C(c) ((unsigned char)(c))
static int SIT(int c, int syntax)
{
static const char spec_symbls[] = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
#ifdef CONFIG_ASH_ALIAS
static const char syntax_index_table[] = {
1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
11, 3 /* "}~" */
};
#else
static const char syntax_index_table[] = {
0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
10, 2 /* "}~" */
};
#endif
const char *s;
int indx;
if (c == PEOF) /* 2^8+2 */
return CENDFILE;
#ifdef CONFIG_ASH_ALIAS
if (c == PEOA) /* 2^8+1 */
indx = 0;
else
#endif
if (U_C(c) >= U_C(CTLESC) && U_C(c) <= U_C(CTLQUOTEMARK))
return CCTL;
else {
s = strchr(spec_symbls, c);
if (s == 0 || *s == 0)
return CWORD;
indx = syntax_index_table[(s - spec_symbls)];
}
return S_I_T[indx][syntax];
}
#else /* USE_SIT_FUNCTION */
#define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]
#ifdef CONFIG_ASH_ALIAS
#define CSPCL_CIGN_CIGN_CIGN 0
#define CSPCL_CWORD_CWORD_CWORD 1
#define CNL_CNL_CNL_CNL 2
#define CWORD_CCTL_CCTL_CWORD 3
#define CDQUOTE_CENDQUOTE_CWORD_CWORD 4
#define CVAR_CVAR_CWORD_CVAR 5
#define CSQUOTE_CWORD_CENDQUOTE_CWORD 6
#define CSPCL_CWORD_CWORD_CLP 7
#define CSPCL_CWORD_CWORD_CRP 8
#define CBACK_CBACK_CCTL_CBACK 9
#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
#define CENDVAR_CENDVAR_CWORD_CENDVAR 11
#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
#define CWORD_CWORD_CWORD_CWORD 13
#define CCTL_CCTL_CCTL_CCTL 14
#else
#define CSPCL_CWORD_CWORD_CWORD 0
#define CNL_CNL_CNL_CNL 1
#define CWORD_CCTL_CCTL_CWORD 2
#define CDQUOTE_CENDQUOTE_CWORD_CWORD 3
#define CVAR_CVAR_CWORD_CVAR 4
#define CSQUOTE_CWORD_CENDQUOTE_CWORD 5
#define CSPCL_CWORD_CWORD_CLP 6
#define CSPCL_CWORD_CWORD_CRP 7
#define CBACK_CBACK_CCTL_CBACK 8
#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9
#define CENDVAR_CENDVAR_CWORD_CENDVAR 10
#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11
#define CWORD_CWORD_CWORD_CWORD 12
#define CCTL_CCTL_CCTL_CCTL 13
#endif
static const char syntax_index_table[258] = {
/* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
/* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
#ifdef CONFIG_ASH_ALIAS
/* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN,
#endif
/* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD,
/* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL,
/* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
/* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
/* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
/* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
/* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL,
/* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
/* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
/* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
/* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
/* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
/* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
/* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
/* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
/* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
/* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
/* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
/* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
/* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
/* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
/* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
/* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
/* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
/* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
/* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
/* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
/* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
/* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
/* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
/* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
/* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
/* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
/* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
/* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
/* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
/* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
/* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
/* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
/* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
/* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
/* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
/* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
/* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
/* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
/* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
/* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
/* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
/* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
/* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
/* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
/* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
/* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
/* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
/* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
/* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
/* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
/* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
/* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
/* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
/* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
/* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
/* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
/* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
/* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
/* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
/* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
/* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
/* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
/* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
/* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
/* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
/* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
/* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
/* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
/* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
/* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
/* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
/* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
/* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
/* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
/* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
/* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
/* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
/* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
/* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
/* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
/* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
/* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
/* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
/* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
/* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
/* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
/* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
/* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
/* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
/* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
/* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
/* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
/* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
/* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
/* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
/* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
/* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
/* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
/* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
/* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
/* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
/* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
/* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
/* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
/* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
/* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
/* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
/* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
/* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
/* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
/* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
/* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
/* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
/* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
/* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
/* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
/* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
/* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
/* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
/* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
/* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
/* 130 0 */ CWORD_CWORD_CWORD_CWORD,
/* 131 1 */ CWORD_CWORD_CWORD_CWORD,
/* 132 2 */ CWORD_CWORD_CWORD_CWORD,
/* 133 3 */ CWORD_CWORD_CWORD_CWORD,
/* 134 4 */ CWORD_CWORD_CWORD_CWORD,
/* 135 5 */ CWORD_CWORD_CWORD_CWORD,
/* 136 6 */ CWORD_CWORD_CWORD_CWORD,
/* 137 7 */ CWORD_CWORD_CWORD_CWORD,
/* 138 8 */ CWORD_CWORD_CWORD_CWORD,
/* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
/* 140 10 "\n" */ CNL_CNL_CNL_CNL,
/* 141 11 */ CWORD_CWORD_CWORD_CWORD,
/* 142 12 */ CWORD_CWORD_CWORD_CWORD,
/* 143 13 */ CWORD_CWORD_CWORD_CWORD,
/* 144 14 */ CWORD_CWORD_CWORD_CWORD,
/* 145 15 */ CWORD_CWORD_CWORD_CWORD,
/* 146 16 */ CWORD_CWORD_CWORD_CWORD,
/* 147 17 */ CWORD_CWORD_CWORD_CWORD,
/* 148 18 */ CWORD_CWORD_CWORD_CWORD,
/* 149 19 */ CWORD_CWORD_CWORD_CWORD,
/* 150 20 */ CWORD_CWORD_CWORD_CWORD,
/* 151 21 */ CWORD_CWORD_CWORD_CWORD,
/* 152 22 */ CWORD_CWORD_CWORD_CWORD,
/* 153 23 */ CWORD_CWORD_CWORD_CWORD,
/* 154 24 */ CWORD_CWORD_CWORD_CWORD,
/* 155 25 */ CWORD_CWORD_CWORD_CWORD,
/* 156 26 */ CWORD_CWORD_CWORD_CWORD,
/* 157 27 */ CWORD_CWORD_CWORD_CWORD,
/* 158 28 */ CWORD_CWORD_CWORD_CWORD,
/* 159 29 */ CWORD_CWORD_CWORD_CWORD,
/* 160 30 */ CWORD_CWORD_CWORD_CWORD,
/* 161 31 */ CWORD_CWORD_CWORD_CWORD,
/* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
/* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
/* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
/* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
/* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
/* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
/* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
/* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
/* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
/* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
/* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
/* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
/* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
/* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
/* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
/* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
/* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
/* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
/* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
/* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
/* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
/* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
/* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
/* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
/* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
/* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
/* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
/* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
/* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
/* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
/* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
/* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
/* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
/* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
/* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
/* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
/* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
/* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
/* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
/* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
/* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
/* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
/* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
/* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
/* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
/* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
/* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
/* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
/* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
/* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
/* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
/* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
/* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
/* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
/* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
/* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
/* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
/* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
/* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
/* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
/* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
/* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
/* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
/* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
/* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
/* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
/* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
/* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
/* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
/* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
/* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
/* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
/* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
/* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
/* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
/* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
/* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
/* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
/* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
/* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
/* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
/* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
/* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
/* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
/* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
/* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
/* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
/* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
/* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
/* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
/* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
/* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
/* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
/* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
/* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
/* 257 127 */ CWORD_CWORD_CWORD_CWORD,
};
#endif /* USE_SIT_FUNCTION */
/* $NetBSD: alias.c,v 1.11 2002/11/24 22:35:38 christos Exp $ */
#define ATABSIZE 39
static int funcblocksize; /* size of structures in function */
static int funcstringsize; /* size of strings in node */
static pointer funcblock; /* block to allocate function from */
static char *funcstring; /* block to allocate strings from */
static const short nodesize[26] = {
SHELL_ALIGN(sizeof (struct ncmd)),
SHELL_ALIGN(sizeof (struct npipe)),
SHELL_ALIGN(sizeof (struct nredir)),
SHELL_ALIGN(sizeof (struct nredir)),
SHELL_ALIGN(sizeof (struct nredir)),
SHELL_ALIGN(sizeof (struct nbinary)),
SHELL_ALIGN(sizeof (struct nbinary)),
SHELL_ALIGN(sizeof (struct nbinary)),
SHELL_ALIGN(sizeof (struct nif)),
SHELL_ALIGN(sizeof (struct nbinary)),
SHELL_ALIGN(sizeof (struct nbinary)),
SHELL_ALIGN(sizeof (struct nfor)),
SHELL_ALIGN(sizeof (struct ncase)),
SHELL_ALIGN(sizeof (struct nclist)),
SHELL_ALIGN(sizeof (struct narg)),
SHELL_ALIGN(sizeof (struct narg)),
SHELL_ALIGN(sizeof (struct nfile)),
SHELL_ALIGN(sizeof (struct nfile)),
SHELL_ALIGN(sizeof (struct nfile)),
SHELL_ALIGN(sizeof (struct nfile)),
SHELL_ALIGN(sizeof (struct nfile)),
SHELL_ALIGN(sizeof (struct ndup)),
SHELL_ALIGN(sizeof (struct ndup)),
SHELL_ALIGN(sizeof (struct nhere)),
SHELL_ALIGN(sizeof (struct nhere)),
SHELL_ALIGN(sizeof (struct nnot)),
};
static void calcsize(union node *);
static void sizenodelist(struct nodelist *);
static union node *copynode(union node *);
static struct nodelist *copynodelist(struct nodelist *);
static char *nodesavestr(char *);
static void evalstring(char *, int);
union node; /* BLETCH for ansi C */
static void evaltree(union node *, int);
static void evalbackcmd(union node *, struct backcmd *);
/* in_function returns nonzero if we are currently evaluating a function */
#define in_function() funcnest
static int evalskip; /* set if we are skipping commands */
static int skipcount; /* number of levels to skip */
static int funcnest; /* depth of function calls */
/* reasons for skipping commands (see comment on breakcmd routine) */
#define SKIPBREAK 1
#define SKIPCONT 2
#define SKIPFUNC 3
#define SKIPFILE 4
/*
* This file was generated by the mkbuiltins program.
*/
#ifdef JOBS
static int bgcmd(int, char **);
#endif
static int breakcmd(int, char **);
static int cdcmd(int, char **);
#ifdef CONFIG_ASH_CMDCMD
static int commandcmd(int, char **);
#endif
static int dotcmd(int, char **);
static int evalcmd(int, char **);
static int execcmd(int, char **);
static int exitcmd(int, char **);
#ifdef CONFIG_ASH_MATH_SUPPORT
static int expcmd(int, char **);
#endif
static int exportcmd(int, char **);
static int falsecmd(int, char **);
#ifdef JOBS
static int fgcmd(int, char **);
#endif
#ifdef CONFIG_ASH_GETOPTS
static int getoptscmd(int, char **);
#endif
static int hashcmd(int, char **);
#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
static int helpcmd(int argc, char **argv);
#endif
#ifdef JOBS
static int jobscmd(int, char **);
#endif
static int localcmd(int, char **);
static int pwdcmd(int, char **);
static int readcmd(int, char **);
static int returncmd(int, char **);
static int setcmd(int, char **);
static int shiftcmd(int, char **);
static int timescmd(int, char **);
static int trapcmd(int, char **);
static int truecmd(int, char **);
static int typecmd(int, char **);
static int umaskcmd(int, char **);
static int unsetcmd(int, char **);
static int waitcmd(int, char **);
static int ulimitcmd(int, char **);
#ifdef JOBS
static int killcmd(int, char **);
#endif
/* $NetBSD: mail.h,v 1.9 2002/11/24 22:35:40 christos Exp $ */
#ifdef CONFIG_ASH_MAIL
static void chkmail(void);
static void changemail(const char *);
#endif
/* $NetBSD: exec.h,v 1.20 2003/01/22 20:36:04 dsl Exp $ */
/* values of cmdtype */
#define CMDUNKNOWN -1 /* no entry in table for command */
#define CMDNORMAL 0 /* command is an executable program */
#define CMDFUNCTION 1 /* command is a shell function */
#define CMDBUILTIN 2 /* command is a shell builtin */
struct builtincmd {
const char *name;
int (*builtin)(int, char **);
/* unsigned flags; */
};
#ifdef CONFIG_ASH_CMDCMD
# ifdef JOBS
# ifdef CONFIG_ASH_ALIAS
# define COMMANDCMD (builtincmd + 7)
# define EXECCMD (builtincmd + 10)
# else
# define COMMANDCMD (builtincmd + 6)
# define EXECCMD (builtincmd + 9)
# endif
# else /* ! JOBS */
# ifdef CONFIG_ASH_ALIAS
# define COMMANDCMD (builtincmd + 6)
# define EXECCMD (builtincmd + 9)
# else
# define COMMANDCMD (builtincmd + 5)
# define EXECCMD (builtincmd + 8)
# endif
# endif /* JOBS */
#else /* ! CONFIG_ASH_CMDCMD */
# ifdef JOBS
# ifdef CONFIG_ASH_ALIAS
# define EXECCMD (builtincmd + 9)
# else
# define EXECCMD (builtincmd + 8)
# endif
# else /* ! JOBS */
# ifdef CONFIG_ASH_ALIAS
# define EXECCMD (builtincmd + 8)
# else
# define EXECCMD (builtincmd + 7)
# endif
# endif /* JOBS */
#endif /* CONFIG_ASH_CMDCMD */
#define BUILTIN_NOSPEC "0"
#define BUILTIN_SPECIAL "1"
#define BUILTIN_REGULAR "2"
#define BUILTIN_SPEC_REG "3"
#define BUILTIN_ASSIGN "4"
#define BUILTIN_SPEC_ASSG "5"
#define BUILTIN_REG_ASSG "6"
#define BUILTIN_SPEC_REG_ASSG "7"
#define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
#define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
static const struct builtincmd builtincmd[] = {
{ BUILTIN_SPEC_REG ".", dotcmd },
{ BUILTIN_SPEC_REG ":", truecmd },
#ifdef CONFIG_ASH_ALIAS
{ BUILTIN_REG_ASSG "alias", aliascmd },
#endif
#ifdef JOBS
{ BUILTIN_REGULAR "bg", bgcmd },
#endif
{ BUILTIN_SPEC_REG "break", breakcmd },
{ BUILTIN_REGULAR "cd", cdcmd },
{ BUILTIN_NOSPEC "chdir", cdcmd },
#ifdef CONFIG_ASH_CMDCMD
{ BUILTIN_REGULAR "command", commandcmd },
#endif
{ BUILTIN_SPEC_REG "continue", breakcmd },
{ BUILTIN_SPEC_REG "eval", evalcmd },
{ BUILTIN_SPEC_REG "exec", execcmd },
{ BUILTIN_SPEC_REG "exit", exitcmd },
#ifdef CONFIG_ASH_MATH_SUPPORT
{ BUILTIN_NOSPEC "exp", expcmd },
#endif
{ BUILTIN_SPEC_REG_ASSG "export", exportcmd },
{ BUILTIN_REGULAR "false", falsecmd },
#ifdef JOBS
{ BUILTIN_REGULAR "fg", fgcmd },
#endif
#ifdef CONFIG_ASH_GETOPTS
{ BUILTIN_REGULAR "getopts", getoptscmd },
#endif
{ BUILTIN_NOSPEC "hash", hashcmd },
#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
{ BUILTIN_NOSPEC "help", helpcmd },
#endif
#ifdef JOBS
{ BUILTIN_REGULAR "jobs", jobscmd },
{ BUILTIN_REGULAR "kill", killcmd },
#endif
#ifdef CONFIG_ASH_MATH_SUPPORT
{ BUILTIN_NOSPEC "let", expcmd },
#endif
{ BUILTIN_ASSIGN "local", localcmd },
{ BUILTIN_NOSPEC "pwd", pwdcmd },
{ BUILTIN_REGULAR "read", readcmd },
{ BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
{ BUILTIN_SPEC_REG "return", returncmd },
{ BUILTIN_SPEC_REG "set", setcmd },
{ BUILTIN_SPEC_REG "shift", shiftcmd },
{ BUILTIN_SPEC_REG "times", timescmd },
{ BUILTIN_SPEC_REG "trap", trapcmd },
{ BUILTIN_REGULAR "true", truecmd },
{ BUILTIN_NOSPEC "type", typecmd },
{ BUILTIN_NOSPEC "ulimit", ulimitcmd },
{ BUILTIN_REGULAR "umask", umaskcmd },
#ifdef CONFIG_ASH_ALIAS
{ BUILTIN_REGULAR "unalias", unaliascmd },
#endif
{ BUILTIN_SPEC_REG "unset", unsetcmd },
{ BUILTIN_REGULAR "wait", waitcmd },
};
#define NUMBUILTINS (sizeof (builtincmd) / sizeof (struct builtincmd) )
struct cmdentry {
int cmdtype;
union param {
int index;
const struct builtincmd *cmd;
struct funcnode *func;
} u;
};
/* action to find_command() */
#define DO_ERR 0x01 /* prints errors */
#define DO_ABS 0x02 /* checks absolute paths */
#define DO_NOFUNC 0x04 /* don't return shell functions, for command */
#define DO_ALTPATH 0x08 /* using alternate path */
#define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
static const char *pathopt; /* set by padvance */
static void shellexec(char **, const char *, int)
__attribute__((__noreturn__));
static char *padvance(const char **, const char *);
static void find_command(char *, struct cmdentry *, int, const char *);
static struct builtincmd *find_builtin(const char *);
static void hashcd(void);
static void changepath(const char *);
static void defun(char *, union node *);
static void unsetfunc(const char *);
#ifdef CONFIG_ASH_MATH_SUPPORT
/* From arith.y */
static int dash_arith(const char *);
#endif
/* $NetBSD: init.h,v 1.9 2002/11/24 22:35:40 christos Exp $ */
static void reset(void);
/* $NetBSD: var.h,v 1.21 2003/01/22 20:36:04 dsl Exp $ */
/*
* Shell variables.
*/
/* flags */
#define VEXPORT 0x01 /* variable is exported */
#define VREADONLY 0x02 /* variable cannot be modified */
#define VSTRFIXED 0x04 /* variable struct is statically allocated */
#define VTEXTFIXED 0x08 /* text is statically allocated */
#define VSTACK 0x10 /* text is allocated on the stack */
#define VUNSET 0x20 /* the variable is not set */
#define VNOFUNC 0x40 /* don't call the callback function */
#define VNOSET 0x80 /* do not set variable - just readonly test */
#define VNOSAVE 0x100 /* when text is on the heap before setvareq */
struct var {
struct var *next; /* next entry in hash list */
int flags; /* flags are defined above */
const char *text; /* name=value */
void (*func)(const char *);
/* function to be called when */
/* the variable gets set/unset */
};
struct localvar {
struct localvar *next; /* next local variable in list */
struct var *vp; /* the variable that was made local */
int flags; /* saved flags */
const char *text; /* saved text */
};
static struct localvar *localvars;
/*
* Shell variables.
*/
#ifdef CONFIG_ASH_GETOPTS
static void getoptsreset(const char *);
#endif
#ifdef CONFIG_LOCALE_SUPPORT
#include <locale.h>
static void change_lc_all(const char *value);
static void change_lc_ctype(const char *value);
#endif
#define VTABSIZE 39
static const char defpathvar[] =
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
#ifdef IFS_BROKEN
static const char defifsvar[] = "IFS= \t\n";
#define defifs (defifsvar + 4)
#else
static const char defifs[] = " \t\n";
#endif
static struct var varinit[] = {
#ifdef IFS_BROKEN
{ 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0 },
#else
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", 0 },
#endif
#ifdef CONFIG_ASH_MAIL
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail },
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
#endif
{ 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath },
{ 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0 },
#ifdef CONFIG_ASH_GETOPTS
{ 0, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset },
#endif
#ifdef CONFIG_LOCALE_SUPPORT
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL=", change_lc_all},
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE=", change_lc_ctype},
#endif
#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE=", NULL},
#endif
};
#define vifs varinit[0]
#ifdef CONFIG_ASH_MAIL
#define vmail (&vifs)[1]
#define vmpath (&vmail)[1]
#else
#define vmpath vifs
#endif
#define vpath (&vmpath)[1]
#define vps1 (&vpath)[1]
#define vps2 (&vps1)[1]
#define vps4 (&vps2)[1]
#define voptind (&vps4)[1]
#define defpath (defpathvar + 5)
/*
* The following macros access the values of the above variables.
* They have to skip over the name. They return the null string
* for unset variables.
*/
#define ifsval() (vifs.text + 4)
#define ifsset() ((vifs.flags & VUNSET) == 0)
#define mailval() (vmail.text + 5)
#define mpathval() (vmpath.text + 9)
#define pathval() (vpath.text + 5)
#define ps1val() (vps1.text + 4)
#define ps2val() (vps2.text + 4)
#define ps4val() (vps4.text + 4)
#define optindval() (voptind.text + 7)
#define mpathset() ((vmpath.flags & VUNSET) == 0)
static void setvar(const char *, const char *, int);
static void setvareq(char *, int);
static void listsetvar(struct strlist *, int);
static char *lookupvar(const char *);
static char *bltinlookup(const char *);
static char **listvars(int, int, char ***);
#define environment() listvars(VEXPORT, VUNSET, 0)
static int showvars(const char *, int, int);
static void poplocalvars(void);
static int unsetvar(const char *);
#ifdef CONFIG_ASH_GETOPTS
static int setvarsafe(const char *, const char *, int);
#endif
static int varcmp(const char *, const char *);
static struct var **hashvar(const char *);
static inline int varequal(const char *a, const char *b) {
return !varcmp(a, b);
}
static int loopnest; /* current loop nesting level */
struct strpush {
struct strpush *prev; /* preceding string on stack */
char *prevstring;
int prevnleft;
#ifdef CONFIG_ASH_ALIAS
struct alias *ap; /* if push was associated with an alias */
#endif
char *string; /* remember the string since it may change */
};
struct parsefile {
struct parsefile *prev; /* preceding file on stack */
int linno; /* current line */
int fd; /* file descriptor (or -1 if string) */
int nleft; /* number of chars left in this line */
int lleft; /* number of chars left in this buffer */
char *nextc; /* next char in buffer */
char *buf; /* input buffer */
struct strpush *strpush; /* for pushing strings at this level */
struct strpush basestrpush; /* so pushing one is fast */
};
/*
* The parsefile structure pointed to by the global variable parsefile
* contains information about the current file being read.
*/
struct redirtab {
struct redirtab *next;
int renamed[10];
int nullredirs;
};
static struct redirtab *redirlist;
static int nullredirs;
extern char **environ;
/* $NetBSD: output.h,v 1.16 2002/11/24 22:35:42 christos Exp $ */
static void outstr(const char *, FILE *);
static void outcslow(int, FILE *);
static void flushall(void);
static void flushout(FILE *);
static int out1fmt(const char *, ...)
__attribute__((__format__(__printf__,1,2)));
static int fmtstr(char *, size_t, const char *, ...)
__attribute__((__format__(__printf__,3,4)));
static void xwrite(int, const void *, size_t);
#define outerr(f) ferror(f)
#define out2c(c) outcslow((c), stderr)
static void out1str(const char *p)
{
outstr(p, stdout);
}
static void out2str(const char *p)
{
outstr(p, stderr);
}
static void out1c(char c)
{
char s[2];
s[0] = c;
s[1] = 0;
outstr(s, stdout);
}
/*
* Initialization code.
*/
/*
* This routine initializes the builtin variables.
*/
static inline void
initvar(void)
{
struct var *vp;
struct var *end;
struct var **vpp;
/*
* PS1 depends on uid
*/
#if defined(CONFIG_FEATURE_COMMAND_EDITING) && defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
vps1.text = "PS1=\\w \\$ ";
#else
if (!geteuid())
vps1.text = "PS1=# ";
#endif
vp = varinit;
end = vp + sizeof(varinit) / sizeof(varinit[0]);
do {
vpp = hashvar(vp->text);
vp->next = *vpp;
*vpp = vp;
} while (++vp < end);
}
static inline void
init(void)
{
/* from input.c: */
{
basepf.nextc = basepf.buf = basebuf;
}
/* from trap.c: */
{
signal(SIGCHLD, SIG_DFL);
}
/* from var.c: */
{
char **envp;
char ppid[32];
initvar();
for (envp = environ ; *envp ; envp++) {
if (strchr(*envp, '=')) {
setvareq(*envp, VEXPORT|VTEXTFIXED);
}
}
snprintf(ppid, sizeof(ppid), "%d", (int) getppid());
setvar("PPID", ppid, 0);
setpwd(0, 0);
}
}
/* PEOF (the end of file marker) */
/*
* The input line number. Input.c just defines this variable, and saves
* and restores it when files are pushed and popped. The user of this
* package must set its value.
*/
static int pgetc(void);
static int pgetc2(void);
static int preadbuffer(void);
static void pungetc(void);
static void pushstring(char *, void *);
static void popstring(void);
static void setinputfile(const char *, int);
static void setinputfd(int, int);
static void setinputstring(char *);
static void popfile(void);
static void popallfiles(void);
static void closescript(void);
/* $NetBSD: jobs.h,v 1.17 2003/01/22 20:36:04 dsl Exp $ */
/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
#define FORK_FG 0
#define FORK_BG 1
#define FORK_NOJOB 2
/* mode flags for showjob(s) */
#define SHOW_PGID 0x01 /* only show pgid - for jobs -p */
#define SHOW_PID 0x04 /* include process pid */
#define SHOW_CHANGED 0x08 /* only jobs whose state has changed */
/*
* A job structure contains information about a job. A job is either a
* single process or a set of processes contained in a pipeline. In the
* latter case, pidlist will be non-NULL, and will point to a -1 terminated
* array of pids.
*/
struct procstat {
pid_t pid; /* process id */
int status; /* last process status from wait() */
char *cmd; /* text of command being run */
};
struct job {
struct procstat ps0; /* status of process */
struct procstat *ps; /* status or processes when more than one */
#if JOBS
int stopstatus; /* status of a stopped job */
#endif
uint32_t
nprocs: 16, /* number of processes */
state: 8,
#define JOBRUNNING 0 /* at least one proc running */
#define JOBSTOPPED 1 /* all procs are stopped */
#define JOBDONE 2 /* all procs are completed */
#if JOBS
sigint: 1, /* job was killed by SIGINT */
jobctl: 1, /* job running under job control */
#endif
waited: 1, /* true if this entry has been waited for */
used: 1, /* true if this entry is in used */
changed: 1; /* true if status has changed */
struct job *prev_job; /* previous job */
};
static pid_t backgndpid; /* pid of last background process */
static int job_warning; /* user was warned about stopped jobs */
#if JOBS
static int jobctl; /* true if doing job control */
#endif
static struct job *makejob(union node *, int);
static int forkshell(struct job *, union node *, int);
static int waitforjob(struct job *);
static int stoppedjobs(void);
#if ! JOBS
#define setjobctl(on) /* do nothing */
#else
static void setjobctl(int);
static void showjobs(FILE *, int);
#endif
/* $NetBSD: main.h,v 1.9 2002/11/24 22:35:41 christos Exp $ */
/* pid of main shell */
static int rootpid;
/* true if we aren't a child of the main shell */
static int rootshell;
static void readcmdfile(char *);
static void cmdloop(int);
/* $NetBSD: memalloc.h,v 1.13 2003/01/22 20:36:04 dsl Exp $ */
struct stackmark {
struct stack_block *stackp;
char *stacknxt;
size_t stacknleft;
struct stackmark *marknext;
};
/* minimum size of a block */
#define MINSIZE SHELL_ALIGN(504)
struct stack_block {
struct stack_block *prev;
char space[MINSIZE];
};
static struct stack_block stackbase;
static struct stack_block *stackp = &stackbase;
static struct stackmark *markp;
static char *stacknxt = stackbase.space;
static size_t stacknleft = MINSIZE;
static char *sstrend = stackbase.space + MINSIZE;
static int herefd = -1;
static pointer ckmalloc(size_t);
static pointer ckrealloc(pointer, size_t);
static char *savestr(const char *);
static pointer stalloc(size_t);
static void stunalloc(pointer);
static void setstackmark(struct stackmark *);
static void popstackmark(struct stackmark *);
static void growstackblock(void);
static void *growstackstr(void);
static char *makestrspace(size_t, char *);
static char *stnputs(const char *, size_t, char *);
static char *stputs(const char *, char *);
static inline char *_STPUTC(char c, char *p) {
if (p == sstrend)
p = growstackstr();
*p++ = c;
return p;
}
#define stackblock() ((void *)stacknxt)
#define stackblocksize() stacknleft
#define STARTSTACKSTR(p) ((p) = stackblock())
#define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
#define CHECKSTRSPACE(n, p) \
({ \
char *q = (p); \
size_t l = (n); \
size_t m = sstrend - q; \
if (l > m) \
(p) = makestrspace(l, q); \
0; \
})
#define USTPUTC(c, p) (*p++ = (c))
#define STACKSTRNUL(p) ((p) == sstrend? (p = growstackstr(), *p = '\0') : (*p = '\0'))
#define STUNPUTC(p) (--p)
#define STTOPC(p) p[-1]
#define STADJUST(amount, p) (p += (amount))
#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
#define ungrabstackstr(s, p) stunalloc((s))
#define stackstrend() ((void *)sstrend)
#define ckfree(p) free((pointer)(p))
/* $NetBSD: mystring.h,v 1.10 2002/11/24 22:35:42 christos Exp $ */
#define DOLATSTRLEN 4
static char *prefix(const char *, const char *);
static int number(const char *);
static int is_number(const char *);
static char *single_quote(const char *);
static char *sstrdup(const char *);
#define equal(s1, s2) (strcmp(s1, s2) == 0)
#define scopy(s1, s2) ((void)strcpy(s2, s1))
/* $NetBSD: options.h,v 1.16 2003/01/22 20:36:04 dsl Exp $ */
struct shparam {
int nparam; /* # of positional parameters (without $0) */
unsigned char malloc; /* if parameter list dynamically allocated */
char **p; /* parameter list */
#ifdef CONFIG_ASH_GETOPTS
int optind; /* next parameter to be processed by getopts */
int optoff; /* used by getopts */
#endif
};
#define eflag optlist[0]
#define fflag optlist[1]
#define Iflag optlist[2]
#define iflag optlist[3]
#define mflag optlist[4]
#define nflag optlist[5]
#define sflag optlist[6]
#define xflag optlist[7]
#define vflag optlist[8]
#define Cflag optlist[9]
#define aflag optlist[10]
#define bflag optlist[11]
#define uflag optlist[12]
#define qflag optlist[13]
#ifdef DEBUG
#define nolog optlist[14]
#define debug optlist[15]
#define NOPTS 16
#else
#define NOPTS 14
#endif
/* $NetBSD: options.c,v 1.33 2003/01/22 20:36:04 dsl Exp $ */
static const char *const optletters_optnames[NOPTS] = {
"e" "errexit",
"f" "noglob",
"I" "ignoreeof",
"i" "interactive",
"m" "monitor",
"n" "noexec",
"s" "stdin",
"x" "xtrace",
"v" "verbose",
"C" "noclobber",
"a" "allexport",
"b" "notify",
"u" "nounset",
"q" "quietprofile",
#ifdef DEBUG
"\0" "nolog",
"\0" "debug",
#endif
};
#define optletters(n) optletters_optnames[(n)][0]
#define optnames(n) (&optletters_optnames[(n)][1])
static char optlist[NOPTS];
static char *arg0; /* value of $0 */
static struct shparam shellparam; /* $@ current positional parameters */
static char **argptr; /* argument list for builtin commands */
static char *optionarg; /* set by nextopt (like getopt) */
static char *optptr; /* used by nextopt */
static char *minusc; /* argument to -c option */
static void procargs(int, char **);
static void optschanged(void);
static void setparam(char **);
static void freeparam(volatile struct shparam *);
static int shiftcmd(int, char **);
static int setcmd(int, char **);
static int nextopt(const char *);
/* $NetBSD: redir.h,v 1.14 2002/11/24 22:35:43 christos Exp $ */
/* flags passed to redirect */
#define REDIR_PUSH 01 /* save previous values of file descriptors */
union node;
static void redirect(union node *, int);
static void popredir(int);
static void clearredir(int);
static int copyfd(int, int);
static int redirectsafe(union node *, int);
/* $NetBSD: show.h,v 1.6 2003/01/22 20:36:04 dsl Exp $ */
#ifdef DEBUG
static void showtree(union node *);
static void trace(const char *, ...);
static void tracev(const char *, va_list);
static void trargs(char **);
static void trputc(int);
static void trputs(const char *);
static void opentrace(void);
#endif
/* $NetBSD: trap.h,v 1.16 2002/11/24 22:35:43 christos Exp $ */
/* trap handler commands */
static char *trap[NSIG];
/* current value of signal */
static char sigmode[NSIG - 1];
/* indicates specified signal received */
static char gotsig[NSIG - 1];
static void clear_traps(void);
static void setsignal(int);
static void ignoresig(int);
static void onsig(int);
static void dotrap(void);
static void setinteractive(int);
static void exitshell(void) __attribute__((__noreturn__));
static int decode_signal(const char *, int);
/*
* This routine is called when an error or an interrupt occurs in an
* interactive shell and control is returned to the main command loop.
*/
static void
reset(void)
{
/* from eval.c: */
{
evalskip = 0;
loopnest = 0;
funcnest = 0;
}
/* from input.c: */
{
parselleft = parsenleft = 0; /* clear input buffer */
popallfiles();
}
/* from parser.c: */
{
tokpushback = 0;
checkkwd = 0;
}
/* from redir.c: */
{
clearredir(0);
}
}
#ifdef CONFIG_ASH_ALIAS
static struct alias *atab[ATABSIZE];
static void setalias(const char *, const char *);
static struct alias *freealias(struct alias *);
static struct alias **__lookupalias(const char *);
static void
setalias(const char *name, const char *val)
{
struct alias *ap, **app;
app = __lookupalias(name);
ap = *app;
INTOFF;
if (ap) {
if (!(ap->flag & ALIASINUSE)) {
ckfree(ap->val);
}
ap->val = savestr(val);
ap->flag &= ~ALIASDEAD;
} else {
/* not found */
ap = ckmalloc(sizeof (struct alias));
ap->name = savestr(name);
ap->val = savestr(val);
ap->flag = 0;
ap->next = 0;
*app = ap;
}
INTON;
}
static int
unalias(const char *name)
{
struct alias **app;
app = __lookupalias(name);
if (*app) {
INTOFF;
*app = freealias(*app);
INTON;
return (0);
}
return (1);
}
static void
rmaliases(void)
{
struct alias *ap, **app;
int i;
INTOFF;
for (i = 0; i < ATABSIZE; i++) {
app = &atab[i];
for (ap = *app; ap; ap = *app) {
*app = freealias(*app);
if (ap == *app) {
app = &ap->next;
}
}
}
INTON;
}
static struct alias *
lookupalias(const char *name, int check)
{
struct alias *ap = *__lookupalias(name);
if (check && ap && (ap->flag & ALIASINUSE))
return (NULL);
return (ap);
}
/*
* TODO - sort output
*/
static int
aliascmd(int argc, char **argv)
{
char *n, *v;
int ret = 0;
struct alias *ap;
if (argc == 1) {
int i;
for (i = 0; i < ATABSIZE; i++)
for (ap = atab[i]; ap; ap = ap->next) {
printalias(ap);
}
return (0);
}
while ((n = *++argv) != NULL) {
if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
if ((ap = *__lookupalias(n)) == NULL) {
fprintf(stderr, "%s: %s not found\n", "alias", n);
ret = 1;
} else
printalias(ap);
} else {
*v++ = '\0';
setalias(n, v);
}
}
return (ret);
}
static int
unaliascmd(int argc, char **argv)
{
int i;
while ((i = nextopt("a")) != '\0') {
if (i == 'a') {
rmaliases();
return (0);
}
}
for (i = 0; *argptr; argptr++) {
if (unalias(*argptr)) {
fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
i = 1;
}
}
return (i);
}
static struct alias *
freealias(struct alias *ap) {
struct alias *next;
if (ap->flag & ALIASINUSE) {
ap->flag |= ALIASDEAD;
return ap;
}
next = ap->next;
ckfree(ap->name);
ckfree(ap->val);
ckfree(ap);
return next;
}
static void
printalias(const struct alias *ap) {
out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
}
static struct alias **
__lookupalias(const char *name) {
unsigned int hashval;
struct alias **app;
const char *p;
unsigned int ch;
p = name;
ch = (unsigned char)*p;
hashval = ch << 4;
while (ch) {
hashval += ch;
ch = (unsigned char)*++p;
}
app = &atab[hashval % ATABSIZE];
for (; *app; app = &(*app)->next) {
if (equal(name, (*app)->name)) {
break;
}
}
return app;
}
#endif /* CONFIG_ASH_ALIAS */
/* $NetBSD: cd.c,v 1.30 2003/01/22 20:36:03 dsl Exp $ */
/*
* The cd and pwd commands.
*/
#define CD_PHYSICAL 1
#define CD_PRINT 2
static int docd(const char *, int);
static int cdopt(void);
static char *curdir = nullstr; /* current working directory */
static char *physdir = nullstr; /* physical working directory */
static int
cdopt(void)
{
int flags = 0;
int i, j;
j = 'L';
while ((i = nextopt("LP"))) {
if (i != j) {
flags ^= CD_PHYSICAL;
j = i;
}
}
return flags;
}
static int
cdcmd(int argc, char **argv)
{
const char *dest;
const char *path;
const char *p;
char c;
struct stat statb;
int flags;
flags = cdopt();
dest = *argptr;
if (!dest)
dest = bltinlookup(homestr);
else if (dest[0] == '-' && dest[1] == '\0') {
dest = bltinlookup("OLDPWD");
flags |= CD_PRINT;
goto step7;
}
if (!dest)
dest = nullstr;
if (*dest == '/')
goto step7;
if (*dest == '.') {
c = dest[1];
dotdot:
switch (c) {
case '\0':
case '/':
goto step6;
case '.':
c = dest[2];
if (c != '.')
goto dotdot;
}
}
if (!*dest)
dest = ".";
if (!(path = bltinlookup("CDPATH"))) {
step6:
step7:
p = dest;
goto docd;
}
do {
c = *path;
p = padvance(&path, dest);
if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
if (c && c != ':')
flags |= CD_PRINT;
docd:
if (!docd(p, flags))
goto out;
break;
}
} while (path);
error("can't cd to %s", dest);
/* NOTREACHED */
out:
if (flags & CD_PRINT)
out1fmt(snlfmt, curdir);
return 0;
}
/*
* Update curdir (the name of the current directory) in response to a
* cd command.
*/
static inline const char *
updatepwd(const char *dir)
{
char *new;
char *p;
char *cdcomppath;
const char *lim;
cdcomppath = sstrdup(dir);
STARTSTACKSTR(new);
if (*dir != '/') {
if (curdir == nullstr)
return 0;
new = stputs(curdir, new);
}
new = makestrspace(strlen(dir) + 2, new);
lim = stackblock() + 1;
if (*dir != '/') {
if (new[-1] != '/')
USTPUTC('/', new);
if (new > lim && *lim == '/')
lim++;
} else {
USTPUTC('/', new);
cdcomppath++;
if (dir[1] == '/' && dir[2] != '/') {
USTPUTC('/', new);
cdcomppath++;
lim++;
}
}
p = strtok(cdcomppath, "/");
while (p) {
switch(*p) {
case '.':
if (p[1] == '.' && p[2] == '\0') {
while (new > lim) {
STUNPUTC(new);
if (new[-1] == '/')
break;
}
break;
} else if (p[1] == '\0')
break;
/* fall through */
default:
new = stputs(p, new);
USTPUTC('/', new);
}
p = strtok(0, "/");
}
if (new > lim)
STUNPUTC(new);
*new = 0;
return stackblock();
}
/*
* Actually do the chdir. We also call hashcd to let the routines in exec.c
* know that the current directory has changed.
*/
static int
docd(const char *dest, int flags)
{
const char *dir = 0;
int err;
TRACE(("docd(\"%s\", %d) called\n", dest, flags));
INTOFF;
if (!(flags & CD_PHYSICAL)) {
dir = updatepwd(dest);
if (dir)
dest = dir;
}
err = chdir(dest);
if (err)
goto out;
setpwd(dir, 1);
hashcd();
out:
INTON;
return err;
}
/*
* Find out what the current directory is. If we already know the current
* directory, this routine returns immediately.
*/
static inline char *
getpwd(void)
{
char *dir = getcwd(0, 0);
return dir ? dir : nullstr;
}
static int
pwdcmd(int argc, char **argv)
{
int flags;
const char *dir = curdir;
flags = cdopt();
if (flags) {
if (physdir == nullstr)
setpwd(dir, 0);
dir = physdir;
}
out1fmt(snlfmt, dir);
return 0;
}
static void
setpwd(const char *val, int setold)
{
char *oldcur, *dir;
oldcur = dir = curdir;
if (setold) {
setvar("OLDPWD", oldcur, VEXPORT);
}
INTOFF;
if (physdir != nullstr) {
if (physdir != oldcur)
free(physdir);
physdir = nullstr;
}
if (oldcur == val || !val) {
char *s = getpwd();
physdir = s;
if (!val)
dir = s;
} else
dir = savestr(val);
if (oldcur != dir && oldcur != nullstr) {
free(oldcur);
}
curdir = dir;
INTON;
setvar("PWD", dir, VEXPORT);
}
/* $NetBSD: error.c,v 1.30 2003/01/22 20:36:03 dsl Exp $ */
/*
* Errors and exceptions.
*/
/*
* Code to handle exceptions in C.
*/
static void exverror(int, const char *, va_list)
__attribute__((__noreturn__));
/*
* Called to raise an exception. Since C doesn't include exceptions, we
* just do a longjmp to the exception handler. The type of exception is
* stored in the global variable "exception".
*/
static void
exraise(int e)
{
#ifdef DEBUG
if (handler == NULL)
abort();
#endif
INTOFF;
exception = e;
longjmp(handler->loc, 1);
}
/*
* Called from trap.c when a SIGINT is received. (If the user specifies
* that SIGINT is to be trapped or ignored using the trap builtin, then
* this routine is not called.) Suppressint is nonzero when interrupts
* are held using the INTOFF macro. (The test for iflag is just
* defensive programming.)
*/
static void
onint(void) {
int i;
intpending = 0;
sigsetmask(0);
i = EXSIG;
if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
if (!(rootshell && iflag)) {
signal(SIGINT, SIG_DFL);
raise(SIGINT);
}
i = EXINT;
}
exraise(i);
/* NOTREACHED */
}
static void
exvwarning(const char *msg, va_list ap)
{
FILE *errs;
const char *name;
const char *fmt;
errs = stderr;
name = arg0;
fmt = "%s: ";
if (commandname) {
name = commandname;
fmt = "%s: %d: ";
}
fprintf(errs, fmt, name, startlinno);
vfprintf(errs, msg, ap);
outcslow('\n', errs);
}
/*
* Exverror is called to raise the error exception. If the second argument
* is not NULL then error prints an error message using printf style
* formatting. It then raises the error exception.
*/
static void
exverror(int cond, const char *msg, va_list ap)
{
#ifdef DEBUG
if (msg) {
TRACE(("exverror(%d, \"", cond));
TRACEV((msg, ap));
TRACE(("\") pid=%d\n", getpid()));
} else
TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
if (msg)
#endif
exvwarning(msg, ap);
flushall();
exraise(cond);
/* NOTREACHED */
}
static void
error(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(EXERROR, msg, ap);
/* NOTREACHED */
va_end(ap);
}
static void
exerror(int cond, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(cond, msg, ap);
/* NOTREACHED */
va_end(ap);
}
/*
* error/warning routines for external builtins
*/
static void
sh_warnx(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
exvwarning(fmt, ap);
va_end(ap);
}
/*
* Return a string describing an error. The returned string may be a
* pointer to a static buffer that will be overwritten on the next call.
* Action describes the operation that got the error.
*/
static const char *
errmsg(int e, const char *em)
{
if(e == ENOENT || e == ENOTDIR) {
return em;
}
return strerror(e);
}
/* $NetBSD: eval.c,v 1.71 2003/01/23 03:33:16 rafal Exp $ */
/*
* Evaluate a command.
*/
/* flags in argument to evaltree */
#define EV_EXIT 01 /* exit after evaluating tree */
#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
#define EV_BACKCMD 04 /* command executing within back quotes */
static void evalloop(union node *, int);
static void evalfor(union node *, int);
static void evalcase(union node *, int);
static void evalsubshell(union node *, int);
static void expredir(union node *);
static void evalpipe(union node *, int);
static void evalcommand(union node *, int);
static int evalbltin(const struct builtincmd *, int, char **);
static int evalfun(struct funcnode *, int, char **, int);
static void prehash(union node *);
static int eprintlist(struct strlist *, int);
static int bltincmd(int, char **);
static const struct builtincmd bltin = {
"\0\0", bltincmd
};
/*
* Called to reset things after an exception.
*/
/*
* The eval commmand.
*/
static int
evalcmd(int argc, char **argv)
{
char *p;
char *concat;
char **ap;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
STARTSTACKSTR(concat);
ap = argv + 2;
for (;;) {
concat = stputs(p, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(' ', concat);
}
STPUTC('\0', concat);
p = grabstackstr(concat);
}
evalstring(p, EV_TESTED);
}
return exitstatus;
}
/*
* Execute a command or commands contained in a string.
*/
static void
evalstring(char *s, int flag)
{
union node *n;
struct stackmark smark;
setstackmark(&smark);
setinputstring(s);
while ((n = parsecmd(0)) != NEOF) {
evaltree(n, flag);
popstackmark(&smark);
if (evalskip)
break;
}
popfile();
popstackmark(&smark);
}
/*
* Evaluate a parse tree. The value is left in the global variable
* exitstatus.
*/
static void
evaltree(union node *n, int flags)
{
int checkexit = 0;
void (*evalfn)(union node *, int);
unsigned isor;
int status;
if (n == NULL) {
TRACE(("evaltree(NULL) called\n"));
goto out;
}
TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
getpid(), n, n->type, flags));
switch (n->type) {
default:
#ifdef DEBUG
out1fmt("Node type = %d\n", n->type);
flushout(stdout);
break;
#endif
case NNOT:
evaltree(n->nnot.com, EV_TESTED);
status = !exitstatus;
goto setstatus;
case NREDIR:
expredir(n->nredir.redirect);
status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
if (!status) {
evaltree(n->nredir.n, flags & EV_TESTED);
status = exitstatus;
}
popredir(0);
goto setstatus;
case NCMD:
evalfn = evalcommand;
checkexit:
if (eflag && !(flags & EV_TESTED))
checkexit = ~0;
goto calleval;
case NFOR:
evalfn = evalfor;
goto calleval;
case NWHILE:
case NUNTIL:
evalfn = evalloop;
goto calleval;
case NSUBSHELL:
case NBACKGND:
evalfn = evalsubshell;
goto calleval;
case NPIPE:
evalfn = evalpipe;
goto checkexit;
case NCASE:
evalfn = evalcase;
goto calleval;
case NAND:
case NOR:
case NSEMI:
#if NAND + 1 != NOR
#error NAND + 1 != NOR
#endif
#if NOR + 1 != NSEMI
#error NOR + 1 != NSEMI
#endif
isor = n->type - NAND;
evaltree(
n->nbinary.ch1,
(flags | ((isor >> 1) - 1)) & EV_TESTED
);
if (!exitstatus == isor)
break;
if (!evalskip) {
n = n->nbinary.ch2;
evaln:
evalfn = evaltree;
calleval:
evalfn(n, flags);
break;
}
break;
case NIF:
evaltree(n->nif.test, EV_TESTED);
if (evalskip)
break;
if (exitstatus == 0) {
n = n->nif.ifpart;
goto evaln;
} else if (n->nif.elsepart) {
n = n->nif.elsepart;
goto evaln;
}
goto success;
case NDEFUN:
defun(n->narg.text, n->narg.next);
success:
status = 0;
setstatus:
exitstatus = status;
break;
}
out:
if (pendingsigs)
dotrap();
if (flags & EV_EXIT || checkexit & exitstatus)
exraise(EXEXIT);
}
#if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
static
#endif
void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
static void
evalloop(union node *n, int flags)
{
int status;
loopnest++;
status = 0;
flags &= EV_TESTED;
for (;;) {
int i;
evaltree(n->nbinary.ch1, EV_TESTED);
if (evalskip) {
skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
evalskip = 0;
continue;
}
if (evalskip == SKIPBREAK && --skipcount <= 0)
evalskip = 0;
break;
}
i = exitstatus;
if (n->type != NWHILE)
i = !i;
if (i != 0)
break;
evaltree(n->nbinary.ch2, flags);
status = exitstatus;
if (evalskip)
goto skipping;
}
loopnest--;
exitstatus = status;
}
static void
evalfor(union node *n, int flags)
{
struct arglist arglist;
union node *argp;
struct strlist *sp;
struct stackmark smark;
setstackmark(&smark);
arglist.lastp = &arglist.list;
for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
/* XXX */
if (evalskip)
goto out;
}
*arglist.lastp = NULL;
exitstatus = 0;
loopnest++;
flags &= EV_TESTED;
for (sp = arglist.list ; sp ; sp = sp->next) {
setvar(n->nfor.var, sp->text, 0);
evaltree(n->nfor.body, flags);
if (evalskip) {
if (evalskip == SKIPCONT && --skipcount <= 0) {
evalskip = 0;
continue;
}
if (evalskip == SKIPBREAK && --skipcount <= 0)
evalskip = 0;
break;
}
}
loopnest--;
out:
popstackmark(&smark);
}
static void
evalcase(union node *n, int flags)
{
union node *cp;
union node *patp;
struct arglist arglist;
struct stackmark smark;
setstackmark(&smark);
arglist.lastp = &arglist.list;
expandarg(n->ncase.expr, &arglist, EXP_TILDE);
exitstatus = 0;
for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
if (casematch(patp, arglist.list->text)) {
if (evalskip == 0) {
evaltree(cp->nclist.body, flags);
}
goto out;
}
}
}
out:
popstackmark(&smark);
}
/*
* Kick off a subshell to evaluate a tree.
*/
static void
evalsubshell(union node *n, int flags)
{
struct job *jp;
int backgnd = (n->type == NBACKGND);
int status;
expredir(n->nredir.redirect);
if (!backgnd && flags & EV_EXIT && !trap[0])
goto nofork;
INTOFF;
jp = makejob(n, 1);
if (forkshell(jp, n, backgnd) == 0) {
INTON;
flags |= EV_EXIT;
if (backgnd)
flags &=~ EV_TESTED;
nofork:
redirect(n->nredir.redirect, 0);
evaltreenr(n->nredir.n, flags);
/* never returns */
}
status = 0;
if (! backgnd)
status = waitforjob(jp);
exitstatus = status;
INTON;
}
/*
* Compute the names of the files in a redirection list.
*/
static void
expredir(union node *n)
{
union node *redir;
for (redir = n ; redir ; redir = redir->nfile.next) {
struct arglist fn;
fn.lastp = &fn.list;
switch (redir->type) {
case NFROMTO:
case NFROM:
case NTO:
case NCLOBBER:
case NAPPEND:
expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
redir->nfile.expfname = fn.list->text;
break;
case NFROMFD:
case NTOFD:
if (redir->ndup.vname) {
expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
fixredir(redir, fn.list->text, 1);
}
break;
}
}
}
/*
* Evaluate a pipeline. All the processes in the pipeline are children
* of the process creating the pipeline. (This differs from some versions
* of the shell, which make the last process in a pipeline the parent
* of all the rest.)
*/
static void
evalpipe(union node *n, int flags)
{
struct job *jp;
struct nodelist *lp;
int pipelen;
int prevfd;
int pip[2];
TRACE(("evalpipe(0x%lx) called\n", (long)n));
pipelen = 0;
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
pipelen++;
flags |= EV_EXIT;
INTOFF;
jp = makejob(n, pipelen);
prevfd = -1;
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
prehash(lp->n);
pip[1] = -1;
if (lp->next) {
if (pipe(pip) < 0) {
close(prevfd);
error("Pipe call failed");
}
}
if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
INTON;
if (pip[1] >= 0) {
close(pip[0]);
}
if (prevfd > 0) {
dup2(prevfd, 0);
close(prevfd);
}
if (pip[1] > 1) {
dup2(pip[1], 1);
close(pip[1]);
}
evaltreenr(lp->n, flags);
/* never returns */
}
if (prevfd >= 0)
close(prevfd);
prevfd = pip[0];
close(pip[1]);
}
if (n->npipe.backgnd == 0) {
exitstatus = waitforjob(jp);
TRACE(("evalpipe: job done exit status %d\n", exitstatus));
}
INTON;
}
/*
* Execute a command inside back quotes. If it's a builtin command, we
* want to save its output in a block obtained from malloc. Otherwise
* we fork off a subprocess and get the output of the command via a pipe.
* Should be called with interrupts off.
*/
static void
evalbackcmd(union node *n, struct backcmd *result)
{
int saveherefd;
result->fd = -1;
result->buf = NULL;
result->nleft = 0;
result->jp = NULL;
if (n == NULL) {
goto out;
}
saveherefd = herefd;
herefd = -1;
{
int pip[2];
struct job *jp;
if (pipe(pip) < 0)
error("Pipe call failed");
jp = makejob(n, 1);
if (forkshell(jp, n, FORK_NOJOB) == 0) {
FORCEINTON;
close(pip[0]);
if (pip[1] != 1) {
close(1);
copyfd(pip[1], 1);
close(pip[1]);
}
eflag = 0;
evaltreenr(n, EV_EXIT);
/* NOTREACHED */
}
close(pip[1]);
result->fd = pip[0];
result->jp = jp;
}
herefd = saveherefd;
out:
TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
result->fd, result->buf, result->nleft, result->jp));
}
#ifdef CONFIG_ASH_CMDCMD
static inline char **
parse_command_args(char **argv, const char **path)
{
char *cp, c;
for (;;) {
cp = *++argv;
if (!cp)
return 0;
if (*cp++ != '-')
break;
if (!(c = *cp++))
break;
if (c == '-' && !*cp) {
argv++;
break;
}
do {
switch (c) {
case 'p':
*path = defpath;
break;
default:
/* run 'typecmd' for other options */
return 0;
}
} while ((c = *cp++));
}
return argv;
}
#endif
/*
* Execute a simple command.
*/
static void
evalcommand(union node *cmd, int flags)
{
struct stackmark smark;
union node *argp;
struct arglist arglist;
struct arglist varlist;
char **argv;
int argc;
struct strlist *sp;
struct cmdentry cmdentry;
struct job *jp;
char *lastarg;
const char *path;
int spclbltin;
int cmd_is_exec;
int status;
char **nargv;
/* First expand the arguments. */
TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
setstackmark(&smark);
back_exitstatus = 0;
cmdentry.cmdtype = CMDBUILTIN;
cmdentry.u.cmd = &bltin;
varlist.lastp = &varlist.list;
*varlist.lastp = NULL;
arglist.lastp = &arglist.list;
*arglist.lastp = NULL;
argc = 0;
for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
struct strlist **spp;
spp = arglist.lastp;
expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
for (sp = *spp; sp; sp = sp->next)
argc++;
}
argv = nargv = stalloc(sizeof (char *) * (argc + 1));
for (sp = arglist.list ; sp ; sp = sp->next) {
TRACE(("evalcommand arg: %s\n", sp->text));
*nargv++ = sp->text;
}
*nargv = NULL;
lastarg = NULL;
if (iflag && funcnest == 0 && argc > 0)
lastarg = nargv[-1];
expredir(cmd->ncmd.redirect);
status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH);
path = vpath.text;
for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
struct strlist **spp;
char *p;
spp = varlist.lastp;
expandarg(argp, &varlist, EXP_VARTILDE);
/*
* Modify the command lookup path, if a PATH= assignment
* is present
*/
p = (*spp)->text;
if (varequal(p, path))
path = p;
}
/* Print the command if xflag is set. */
if (xflag) {
int sep;
out2str(ps4val());
sep = 0;
sep = eprintlist(varlist.list, sep);
eprintlist(arglist.list, sep);
out2c('\n');
flushall();
}
cmd_is_exec = 0;
spclbltin = -1;
/* Now locate the command. */
if (argc) {
const char *oldpath;
int cmd_flag = DO_ERR;
path += 5;
oldpath = path;
for (;;) {
find_command(argv[0], &cmdentry, cmd_flag, path);
if (cmdentry.cmdtype == CMDUNKNOWN) {
status = 127;
flushout(stderr);
goto bail;
}
/* implement bltin and command here */
if (cmdentry.cmdtype != CMDBUILTIN)
break;
if (spclbltin < 0)
spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
if (cmdentry.u.cmd == EXECCMD)
cmd_is_exec++;
#ifdef CONFIG_ASH_CMDCMD
if (cmdentry.u.cmd == COMMANDCMD) {
path = oldpath;
nargv = parse_command_args(argv, &path);
if (!nargv)
break;
argc -= nargv - argv;
argv = nargv;
cmd_flag |= DO_NOFUNC;
} else
#endif
break;
}
}
if (status) {
/* We have a redirection error. */
if (spclbltin > 0)
exraise(EXERROR);
bail:
exitstatus = status;
goto out;
}
/* Execute the command. */
switch (cmdentry.cmdtype) {
default:
/* Fork off a child process if necessary. */
if (!(flags & EV_EXIT) || trap[0]) {
INTOFF;
jp = makejob(cmd, 1);
if (forkshell(jp, cmd, FORK_FG) != 0) {
exitstatus = waitforjob(jp);
INTON;
break;
}
FORCEINTON;
}
listsetvar(varlist.list, VEXPORT|VSTACK);
shellexec(argv, path, cmdentry.u.index);
/* NOTREACHED */
case CMDBUILTIN:
cmdenviron = varlist.list;
if (cmdenviron) {
struct strlist *list = cmdenviron;
int i = VNOSET;
if (spclbltin > 0 || argc == 0) {
i = 0;
if (cmd_is_exec && argc > 1)
i = VEXPORT;
}
listsetvar(list, i);
}
if (evalbltin(cmdentry.u.cmd, argc, argv)) {
int exit_status;
int i, j;
i = exception;
if (i == EXEXIT)
goto raise;
exit_status = 2;
j = 0;
if (i == EXINT)
j = SIGINT;
if (i == EXSIG)
j = pendingsigs;
if (j)
exit_status = j + 128;
exitstatus = exit_status;
if (i == EXINT || spclbltin > 0) {
raise:
longjmp(handler->loc, 1);
}
FORCEINTON;
}
break;
case CMDFUNCTION:
listsetvar(varlist.list, 0);
if (evalfun(cmdentry.u.func, argc, argv, flags))
goto raise;
break;
}
out:
popredir(cmd_is_exec);
if (lastarg)
/* dsl: I think this is intended to be used to support
* '_' in 'vi' command mode during line editing...
* However I implemented that within libedit itself.
*/
setvar("_", lastarg, 0);
popstackmark(&smark);
}
static int
evalbltin(const struct builtincmd *cmd, int argc, char **argv) {
char *volatile savecmdname;
struct jmploc *volatile savehandler;
struct jmploc jmploc;
int i;
savecmdname = commandname;
if ((i = setjmp(jmploc.loc)))
goto cmddone;
savehandler = handler;
handler = &jmploc;
commandname = argv[0];
argptr = argv + 1;
optptr = NULL; /* initialize nextopt */
exitstatus = (*cmd->builtin)(argc, argv);
flushall();
cmddone:
exitstatus |= outerr(stdout);
commandname = savecmdname;
exsig = 0;
handler = savehandler;
return i;
}
static int
evalfun(struct funcnode *func, int argc, char **argv, int flags)
{
volatile struct shparam saveparam;
struct localvar *volatile savelocalvars;
struct jmploc *volatile savehandler;
struct jmploc jmploc;
int e;
saveparam = shellparam;
savelocalvars = localvars;
if ((e = setjmp(jmploc.loc))) {
goto funcdone;
}
INTOFF;
savehandler = handler;
handler = &jmploc;
localvars = NULL;
shellparam.malloc = 0;
func->count++;
INTON;
shellparam.nparam = argc - 1;
shellparam.p = argv + 1;
#ifdef CONFIG_ASH_GETOPTS
shellparam.optind = 1;
shellparam.optoff = -1;
#endif
funcnest++;
evaltree(&func->n, flags & EV_TESTED);
funcnest--;
funcdone:
INTOFF;
freefunc(func);
poplocalvars();
localvars = savelocalvars;
freeparam(&shellparam);
shellparam = saveparam;
handler = savehandler;
INTON;
if (evalskip == SKIPFUNC) {
evalskip = 0;
skipcount = 0;
}
return e;
}
/*
* Search for a command. This is called before we fork so that the
* location of the command will be available in the parent as well as
* the child.
*/
static void
prehash(union node *n)
{
struct cmdentry entry;
if (n->type == NCMD && n->ncmd.args)
find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
}
/*
* Builtin commands. Builtin commands whose functions are closely
* tied to evaluation are implemented here.
*/
/*
* No command given.
*/
static int
bltincmd(int argc, char **argv)
{
/*
* Preserve exitstatus of a previous possible redirection
* as POSIX mandates
*/
return back_exitstatus;
}
/*
* Handle break and continue commands. Break, continue, and return are
* all handled by setting the evalskip flag. The evaluation routines
* above all check this flag, and if it is set they start skipping
* commands rather than executing them. The variable skipcount is
* the number of loops to break/continue, or the number of function
* levels to return. (The latter is always 1.) It should probably
* be an error to break out of more loops than exist, but it isn't
* in the standard shell so we don't make it one here.
*/
static int
breakcmd(int argc, char **argv)
{
int n = argc > 1 ? number(argv[1]) : 1;
if (n <= 0)
error(illnum, argv[1]);
if (n > loopnest)
n = loopnest;
if (n > 0) {
evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
skipcount = n;
}
return 0;
}
/*
* The return command.
*/
static int
returncmd(int argc, char **argv)
{
int ret = argc > 1 ? number(argv[1]) : exitstatus;
if (funcnest) {
evalskip = SKIPFUNC;
skipcount = 1;
return ret;
}
else {
/* Do what ksh does; skip the rest of the file */
evalskip = SKIPFILE;
skipcount = 1;
return ret;
}
}
static int
falsecmd(int argc, char **argv)
{
return 1;
}
static int
truecmd(int argc, char **argv)
{
return 0;
}
static int
execcmd(int argc, char **argv)
{
if (argc > 1) {
iflag = 0; /* exit on error */
mflag = 0;
optschanged();
shellexec(argv + 1, pathval(), 0);
}
return 0;
}
static int
eprintlist(struct strlist *sp, int sep)
{
while (sp) {
const char *p;
p = " %s" + (1 - sep);
sep |= 1;
fprintf(stderr, p, sp->text);
sp = sp->next;
}
return sep;
}
/* $NetBSD: exec.c,v 1.35 2003/01/22 20:36:04 dsl Exp $ */
/*
* When commands are first encountered, they are entered in a hash table.
* This ensures that a full path search will not have to be done for them
* on each invocation.
*
* We should investigate converting to a linear search, even though that
* would make the command name "hash" a misnomer.
*/
#define CMDTABLESIZE 31 /* should be prime */
#define ARB 1 /* actual size determined at run time */
struct tblentry {
struct tblentry *next; /* next entry in hash chain */
union param param; /* definition of builtin function */
short cmdtype; /* index identifying command */
char rehash; /* if set, cd done since entry created */
char cmdname[ARB]; /* name of command */
};
static struct tblentry *cmdtable[CMDTABLESIZE];
static int builtinloc = -1; /* index in path of %builtin, or -1 */
static void tryexec(char *, char **, char **);
static void printentry(struct tblentry *);
static void clearcmdentry(int);
static struct tblentry *cmdlookup(const char *, int);
static void delete_cmd_entry(void);
/*
* Exec a program. Never returns. If you change this routine, you may
* have to change the find_command routine as well.
*/
static void
shellexec(char **argv, const char *path, int idx)
{
char *cmdname;
int e;
char **envp;
clearredir(1);
envp = environment();
if (strchr(argv[0], '/') != NULL
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
|| find_applet_by_name(argv[0])
#endif
) {
tryexec(argv[0], argv, envp);
e = errno;
} else {
e = ENOENT;
while ((cmdname = padvance(&path, argv[0])) != NULL) {
if (--idx < 0 && pathopt == NULL) {
tryexec(cmdname, argv, envp);
if (errno != ENOENT && errno != ENOTDIR)
e = errno;
}
stunalloc(cmdname);
}
}
/* Map to POSIX errors */
switch (e) {
case EACCES:
exerrno = 126;
break;
case ENOENT:
exerrno = 127;
break;
default:
exerrno = 2;
break;
}
TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
argv[0], e, suppressint ));
exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
/* NOTREACHED */
}
static void
tryexec(char *cmd, char **argv, char **envp)
{
int repeated = 0;
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
int flg_bb = 0;
char *name = cmd;
#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
name = bb_get_last_path_component(name);
if(find_applet_by_name(name) != NULL)
flg_bb = 1;
#else
if(strchr(name, '/') == NULL && find_applet_by_name(name) != NULL) {
flg_bb = 1;
}
#endif
if(flg_bb) {
char **ap;
char **new;
*argv = name;
if(strcmp(name, "busybox")) {
for (ap = argv; *ap; ap++);
ap = new = xmalloc((ap - argv + 2) * sizeof(char *));
*ap++ = cmd = "/bin/busybox";
while ((*ap++ = *argv++));
argv = new;
repeated++;
} else {
cmd = "/bin/busybox";
}
}
#endif
repeat:
#ifdef SYSV
do {
execve(cmd, argv, envp);
} while (errno == EINTR);
#else
execve(cmd, argv, envp);
#endif
if (repeated++) {
ckfree(argv);
} else if (errno == ENOEXEC) {
char **ap;
char **new;
for (ap = argv; *ap; ap++)
;
ap = new = ckmalloc((ap - argv + 2) * sizeof(char *));
*ap++ = cmd = "/bin/sh";
while ((*ap++ = *argv++))
;
argv = new;
goto repeat;
}
}
/*
* Do a path search. The variable path (passed by reference) should be
* set to the start of the path before the first call; padvance will update
* this value as it proceeds. Successive calls to padvance will return
* the possible path expansions in sequence. If an option (indicated by
* a percent sign) appears in the path entry then the global variable
* pathopt will be set to point to it; otherwise pathopt will be set to
* NULL.
*/
static char *
padvance(const char **path, const char *name)
{
const char *p;
char *q;
const char *start;
size_t len;
if (*path == NULL)
return NULL;
start = *path;
for (p = start ; *p && *p != ':' && *p != '%' ; p++);
len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
while (stackblocksize() < len)
growstackblock();
q = stackblock();
if (p != start) {
memcpy(q, start, p - start);
q += p - start;
*q++ = '/';
}
strcpy(q, name);
pathopt = NULL;
if (*p == '%') {
pathopt = ++p;
while (*p && *p != ':') p++;
}
if (*p == ':')
*path = p + 1;
else
*path = NULL;
return stalloc(len);
}
/*** Command hashing code ***/
static int
hashcmd(int argc, char **argv)
{
struct tblentry **pp;
struct tblentry *cmdp;
int c;
struct cmdentry entry;
char *name;
while ((c = nextopt("r")) != '\0') {
clearcmdentry(0);
return 0;
}
if (*argptr == NULL) {
for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
if (cmdp->cmdtype == CMDNORMAL)
printentry(cmdp);
}
}
return 0;
}
c = 0;
while ((name = *argptr) != NULL) {
if ((cmdp = cmdlookup(name, 0)) != NULL
&& (cmdp->cmdtype == CMDNORMAL
|| (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
delete_cmd_entry();
find_command(name, &entry, DO_ERR, pathval());
if (entry.cmdtype == CMDUNKNOWN)
c = 1;
argptr++;
}
return c;
}
static void
printentry(struct tblentry *cmdp)
{
int idx;
const char *path;
char *name;
idx = cmdp->param.index;
path = pathval();
do {
name = padvance(&path, cmdp->cmdname);
stunalloc(name);
} while (--idx >= 0);
out1str(name);
out1fmt(snlfmt, cmdp->rehash ? "*" : nullstr);
}
/*
* Resolve a command name. If you change this routine, you may have to
* change the shellexec routine as well.
*/
static void
find_command(char *name, struct cmdentry *entry, int act, const char *path)
{
struct tblentry *cmdp;
int idx;
int prev;
char *fullname;
struct stat statb;
int e;
int updatetbl;
struct builtincmd *bcmd;
/* If name contains a slash, don't use PATH or hash table */
if (strchr(name, '/') != NULL) {
entry->u.index = -1;
if (act & DO_ABS) {
while (stat(name, &statb) < 0) {
#ifdef SYSV
if (errno == EINTR)
continue;
#endif
entry->cmdtype = CMDUNKNOWN;
return;
}
}
entry->cmdtype = CMDNORMAL;
return;
}
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
if (find_applet_by_name(name)) {
entry->cmdtype = CMDNORMAL;
entry->u.index = -1;
return;
}
#endif
updatetbl = (path == pathval());
if (!updatetbl) {
act |= DO_ALTPATH;
if (strstr(path, "%builtin") != NULL)
act |= DO_ALTBLTIN;
}
/* If name is in the table, check answer will be ok */
if ((cmdp = cmdlookup(name, 0)) != NULL) {
int bit;
switch (cmdp->cmdtype) {
default:
#if DEBUG
abort();
#endif
case CMDNORMAL:
bit = DO_ALTPATH;
break;
case CMDFUNCTION:
bit = DO_NOFUNC;
break;
case CMDBUILTIN:
bit = DO_ALTBLTIN;
break;
}
if (act & bit) {
updatetbl = 0;
cmdp = NULL;
} else if (cmdp->rehash == 0)
/* if not invalidated by cd, we're done */
goto success;
}
/* If %builtin not in path, check for builtin next */
bcmd = find_builtin(name);
if (bcmd && (IS_BUILTIN_REGULAR(bcmd) || (
act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : builtinloc <= 0
)))
goto builtin_success;
/* We have to search path. */
prev = -1; /* where to start */
if (cmdp && cmdp->rehash) { /* doing a rehash */
if (cmdp->cmdtype == CMDBUILTIN)
prev = builtinloc;
else
prev = cmdp->param.index;
}
e = ENOENT;
idx = -1;
loop:
while ((fullname = padvance(&path, name)) != NULL) {
stunalloc(fullname);
idx++;
if (pathopt) {
if (prefix(pathopt, "builtin")) {
if (bcmd)
goto builtin_success;
continue;
} else if (!(act & DO_NOFUNC) &&
prefix(pathopt, "func")) {
/* handled below */
} else {
/* ignore unimplemented options */
continue;
}
}
/* if rehash, don't redo absolute path names */
if (fullname[0] == '/' && idx <= prev) {
if (idx < prev)
continue;
TRACE(("searchexec \"%s\": no change\n", name));
goto success;
}
while (stat(fullname, &statb) < 0) {
#ifdef SYSV
if (errno == EINTR)
continue;
#endif
if (errno != ENOENT && errno != ENOTDIR)
e = errno;
goto loop;
}
e = EACCES; /* if we fail, this will be the error */
if (!S_ISREG(statb.st_mode))
continue;
if (pathopt) { /* this is a %func directory */
stalloc(strlen(fullname) + 1);
readcmdfile(fullname);
if ((cmdp = cmdlookup(name, 0)) == NULL ||
cmdp->cmdtype != CMDFUNCTION)
error("%s not defined in %s", name, fullname);
stunalloc(fullname);
goto success;
}
TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
if (!updatetbl) {
entry->cmdtype = CMDNORMAL;
entry->u.index = idx;
return;
}
INTOFF;
cmdp = cmdlookup(name, 1);
cmdp->cmdtype = CMDNORMAL;
cmdp->param.index = idx;
INTON;
goto success;
}
/* We failed. If there was an entry for this command, delete it */
if (cmdp && updatetbl)
delete_cmd_entry();
if (act & DO_ERR)
sh_warnx("%s: %s", name, errmsg(e, E_EXEC));
entry->cmdtype = CMDUNKNOWN;
return;
builtin_success:
if (!updatetbl) {
entry->cmdtype = CMDBUILTIN;
entry->u.cmd = bcmd;
return;
}
INTOFF;
cmdp = cmdlookup(name, 1);
cmdp->cmdtype = CMDBUILTIN;
cmdp->param.cmd = bcmd;
INTON;
success:
cmdp->rehash = 0;
entry->cmdtype = cmdp->cmdtype;
entry->u = cmdp->param;
}
/*
* Wrapper around strcmp for qsort/bsearch/...
*/
static int pstrcmp(const void *a, const void *b)
{
return strcmp((const char *) a, (*(const char *const *) b) + 1);
}
/*
* Search the table of builtin commands.
*/
static struct builtincmd *
find_builtin(const char *name)
{
struct builtincmd *bp;
bp = bsearch(
name, builtincmd, NUMBUILTINS, sizeof(struct builtincmd),
pstrcmp
);
return bp;
}
/*
* Called when a cd is done. Marks all commands so the next time they
* are executed they will be rehashed.
*/
static void
hashcd(void)
{
struct tblentry **pp;
struct tblentry *cmdp;
for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
if (cmdp->cmdtype == CMDNORMAL || (
cmdp->cmdtype == CMDBUILTIN &&
!(IS_BUILTIN_REGULAR(cmdp->param.cmd)) &&
builtinloc > 0
))
cmdp->rehash = 1;
}
}
}
/*
* Fix command hash table when PATH changed.
* Called before PATH is changed. The argument is the new value of PATH;
* pathval() still returns the old value at this point.
* Called with interrupts off.
*/
static void
changepath(const char *newval)
{
const char *old, *new;
int idx;
int firstchange;
int idx_bltin;
old = pathval();
new = newval;
firstchange = 9999; /* assume no change */
idx = 0;
idx_bltin = -1;
for (;;) {
if (*old != *new) {
firstchange = idx;
if ((*old == '\0' && *new == ':')
|| (*old == ':' && *new == '\0'))
firstchange++;
old = new; /* ignore subsequent differences */
}
if (*new == '\0')
break;
if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
idx_bltin = idx;
if (*new == ':') {
idx++;
}
new++, old++;
}
if (builtinloc < 0 && idx_bltin >= 0)
builtinloc = idx_bltin; /* zap builtins */
if (builtinloc >= 0 && idx_bltin < 0)
firstchange = 0;
clearcmdentry(firstchange);
builtinloc = idx_bltin;
}
/*
* Clear out command entries. The argument specifies the first entry in
* PATH which has changed.
*/
static void
clearcmdentry(int firstchange)
{
struct tblentry **tblp;
struct tblentry **pp;
struct tblentry *cmdp;
INTOFF;
for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
pp = tblp;
while ((cmdp = *pp) != NULL) {
if ((cmdp->cmdtype == CMDNORMAL &&
cmdp->param.index >= firstchange)
|| (cmdp->cmdtype == CMDBUILTIN &&
builtinloc >= firstchange)) {
*pp = cmdp->next;
ckfree(cmdp);
} else {
pp = &cmdp->next;
}
}
}
INTON;
}
/*
* Locate a command in the command hash table. If "add" is nonzero,
* add the command to the table if it is not already present. The
* variable "lastcmdentry" is set to point to the address of the link
* pointing to the entry, so that delete_cmd_entry can delete the
* entry.
*
* Interrupts must be off if called with add != 0.
*/
static struct tblentry **lastcmdentry;
static struct tblentry *
cmdlookup(const char *name, int add)
{
unsigned int hashval;
const char *p;
struct tblentry *cmdp;
struct tblentry **pp;
p = name;
hashval = (unsigned char)*p << 4;
while (*p)
hashval += (unsigned char)*p++;
hashval &= 0x7FFF;
pp = &cmdtable[hashval % CMDTABLESIZE];
for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
if (equal(cmdp->cmdname, name))
break;
pp = &cmdp->next;
}
if (add && cmdp == NULL) {
cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
+ strlen(name) + 1);
cmdp->next = NULL;
cmdp->cmdtype = CMDUNKNOWN;
strcpy(cmdp->cmdname, name);
}
lastcmdentry = pp;
return cmdp;
}
/*
* Delete the command entry returned on the last lookup.
*/
static void
delete_cmd_entry(void)
{
struct tblentry *cmdp;
INTOFF;
cmdp = *lastcmdentry;
*lastcmdentry = cmdp->next;
if (cmdp->cmdtype == CMDFUNCTION)
freefunc(cmdp->param.func);
ckfree(cmdp);
INTON;
}
/*
* Add a new command entry, replacing any existing command entry for
* the same name - except special builtins.
*/
static inline void
addcmdentry(char *name, struct cmdentry *entry)
{
struct tblentry *cmdp;
cmdp = cmdlookup(name, 1);
if (cmdp->cmdtype == CMDFUNCTION) {
freefunc(cmdp->param.func);
}
cmdp->cmdtype = entry->cmdtype;
cmdp->param = entry->u;
cmdp->rehash = 0;
}
/*
* Make a copy of a parse tree.
*/
static inline struct funcnode *
copyfunc(union node *n)
{
struct funcnode *f;
size_t blocksize;
funcblocksize = offsetof(struct funcnode, n);
funcstringsize = 0;
calcsize(n);
blocksize = funcblocksize;
f = ckmalloc(blocksize + funcstringsize);
funcblock = (char *) f + offsetof(struct funcnode, n);
funcstring = (char *) f + blocksize;
copynode(n);
f->count = 0;
return f;
}
/*
* Define a shell function.
*/
static void
defun(char *name, union node *func)
{
struct cmdentry entry;
INTOFF;
entry.cmdtype = CMDFUNCTION;
entry.u.func = copyfunc(func);
addcmdentry(name, &entry);
INTON;
}
/*
* Delete a function if it exists.
*/
static void
unsetfunc(const char *name)
{
struct tblentry *cmdp;
if ((cmdp = cmdlookup(name, 0)) != NULL &&
cmdp->cmdtype == CMDFUNCTION)
delete_cmd_entry();
}
/*
* Locate and print what a word is...
*/
#ifdef CONFIG_ASH_CMDCMD
static int
describe_command(char *command, int describe_command_verbose)
#else
#define describe_command_verbose 1
static int
describe_command(char *command)
#endif
{
struct cmdentry entry;
struct tblentry *cmdp;
#ifdef CONFIG_ASH_ALIAS
const struct alias *ap;
#endif
const char *path = pathval();
if (describe_command_verbose) {
out1str(command);
}
/* First look at the keywords */
if (findkwd(command)) {
out1str(describe_command_verbose ? " is a shell keyword" : command);
goto out;
}
#ifdef CONFIG_ASH_ALIAS
/* Then look at the aliases */
if ((ap = lookupalias(command, 0)) != NULL) {
if (describe_command_verbose) {
out1fmt(" is an alias for %s", ap->val);
} else {
out1str("alias ");
printalias(ap);
return 0;
}
goto out;
}
#endif
/* Then check if it is a tracked alias */
if ((cmdp = cmdlookup(command, 0)) != NULL) {
entry.cmdtype = cmdp->cmdtype;
entry.u = cmdp->param;
} else {
/* Finally use brute force */
find_command(command, &entry, DO_ABS, path);
}
switch (entry.cmdtype) {
case CMDNORMAL: {
int j = entry.u.index;
char *p;
if (j == -1) {
p = command;
} else {
do {
p = padvance(&path, command);
stunalloc(p);
} while (--j >= 0);
}
if (describe_command_verbose) {
out1fmt(" is%s %s",
(cmdp ? " a tracked alias for" : nullstr), p
);
} else {
out1str(p);
}
break;
}
case CMDFUNCTION:
if (describe_command_verbose) {
out1str(" is a shell function");
} else {
out1str(command);
}
break;
case CMDBUILTIN:
if (describe_command_verbose) {
out1fmt(" is a %sshell builtin",
IS_BUILTIN_SPECIAL(entry.u.cmd) ?
"special " : nullstr
);
} else {
out1str(command);
}
break;
default:
if (describe_command_verbose) {
out1str(": not found\n");
}
return 127;
}
out:
out1c('\n');
return 0;
}
static int
typecmd(int argc, char **argv)
{
int i;
int err = 0;
for (i = 1; i < argc; i++) {
#ifdef CONFIG_ASH_CMDCMD
err |= describe_command(argv[i], 1);
#else
err |= describe_command(argv[i]);
#endif
}
return err;
}
#ifdef CONFIG_ASH_CMDCMD
static int
commandcmd(int argc, char **argv)
{
int c;
int default_path = 0;
int verify_only = 0;
int verbose_verify_only = 0;
while ((c = nextopt("pvV")) != '\0')
switch (c) {
default:
#ifdef DEBUG
fprintf(stderr,
"command: nextopt returned character code 0%o\n", c);
return EX_SOFTWARE;
#endif
case 'p':
default_path = 1;
break;
case 'v':
verify_only = 1;
break;
case 'V':
verbose_verify_only = 1;
break;
}
if (default_path + verify_only + verbose_verify_only > 1 ||
!*argptr) {
fprintf(stderr,
"command [-p] command [arg ...]\n"
"command {-v|-V} command\n");
return EX_USAGE;
}
if (verify_only || verbose_verify_only) {
return describe_command(*argptr, verbose_verify_only);
}
return 0;
}
#endif
/* $NetBSD: expand.c,v 1.56 2002/11/24 22:35:39 christos Exp $ */
/*
* Routines to expand arguments to commands. We have to deal with
* backquotes, shell variables, and file metacharacters.
*/
/*
* _rmescape() flags
*/
#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
#define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
#define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
#define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
/*
* Structure specifying which parts of the string should be searched
* for IFS characters.
*/
struct ifsregion {
struct ifsregion *next; /* next region in list */
int begoff; /* offset of start of region */
int endoff; /* offset of end of region */
int nulonly; /* search for nul bytes only */
};
/* output of current string */
static char *expdest;
/* list of back quote expressions */
static struct nodelist *argbackq;
/* first struct in list of ifs regions */
static struct ifsregion ifsfirst;
/* last struct in list */
static struct ifsregion *ifslastp;
/* holds expanded arg list */
static struct arglist exparg;
static void argstr(char *, int);
static char *exptilde(char *, char *, int);
static void expbackq(union node *, int, int);
static const char *subevalvar(char *, char *, int, int, int, int, int);
static char *evalvar(char *, int);
static int varisset(char *, int);
static void strtodest(const char *, int, int);
static void memtodest(const char *p, size_t len, int syntax, int quotes);
static void varvalue(char *, int, int);
static void recordregion(int, int, int);
static void removerecordregions(int);
static void ifsbreakup(char *, struct arglist *);
static void ifsfree(void);
static void expandmeta(struct strlist *, int);
static void addglob(const glob_t *);
static void addfname(char *);
static int patmatch(char *, const char *);
static int cvtnum(long);
static size_t esclen(const char *, const char *);
static char *scanleft(char *, char *, char *, char *, int, int);
static char *scanright(char *, char *, char *, char *, int, int);
static void varunset(const char *, const char *, const char *, int)
__attribute__((__noreturn__));
#define pmatch(a, b) !fnmatch((a), (b), 0)
/*
* Prepare a pattern for a glob(3) call.
*
* Returns an stalloced string.
*/
static inline char *
preglob(const char *pattern, int quoted, int flag) {
flag |= RMESCAPE_GLOB;
if (quoted) {
flag |= RMESCAPE_QUOTED;
}
return _rmescapes((char *)pattern, flag);
}
static size_t
esclen(const char *start, const char *p) {
size_t esc = 0;
while (p > start && *--p == CTLESC) {
esc++;
}
return esc;
}
/*
* Expand shell variables and backquotes inside a here document.
*/
static inline void
expandhere(union node *arg, int fd)
{
herefd = fd;
expandarg(arg, (struct arglist *)NULL, 0);
xwrite(fd, stackblock(), expdest - (char *)stackblock());
}
/*
* Perform variable substitution and command substitution on an argument,
* placing the resulting list of arguments in arglist. If EXP_FULL is true,
* perform splitting and file name expansion. When arglist is NULL, perform
* here document expansion.
*/
void
expandarg(union node *arg, struct arglist *arglist, int flag)
{
struct strlist *sp;
char *p;
argbackq = arg->narg.backquote;
STARTSTACKSTR(expdest);
ifsfirst.next = NULL;
ifslastp = NULL;
argstr(arg->narg.text, flag);
if (arglist == NULL) {
return; /* here document expanded */
}
STPUTC('\0', expdest);
p = grabstackstr(expdest);
exparg.lastp = &exparg.list;
/*
* TODO - EXP_REDIR
*/
if (flag & EXP_FULL) {
ifsbreakup(p, &exparg);
*exparg.lastp = NULL;
exparg.lastp = &exparg.list;
expandmeta(exparg.list, flag);
} else {
if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
rmescapes(p);
sp = (struct strlist *)stalloc(sizeof (struct strlist));
sp->text = p;
*exparg.lastp = sp;
exparg.lastp = &sp->next;
}
if (ifsfirst.next)
ifsfree();
*exparg.lastp = NULL;
if (exparg.list) {
*arglist->lastp = exparg.list;
arglist->lastp = exparg.lastp;
}
}
/*
* Perform variable and command substitution. If EXP_FULL is set, output CTLESC
* characters to allow for further processing. Otherwise treat
* $@ like $* since no splitting will be performed.
*/
static void
argstr(char *p, int flag)
{
static const char spclchars[] = {
'=',
':',
CTLQUOTEMARK,
CTLENDVAR,
CTLESC,
CTLVAR,
CTLBACKQ,
CTLBACKQ | CTLQUOTE,
#ifdef CONFIG_ASH_MATH_SUPPORT
CTLENDARI,
#endif
0
};
const char *reject = spclchars;
int c;
int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
int breakall = flag & EXP_WORD;
int inquotes;
size_t length;
int startloc;
if (!(flag & EXP_VARTILDE)) {
reject += 2;
} else if (flag & EXP_VARTILDE2) {
reject++;
}
inquotes = 0;
length = 0;
if (flag & EXP_TILDE) {
char *q;
flag &= ~EXP_TILDE;
tilde:
q = p;
if (*q == CTLESC && (flag & EXP_QWORD))
q++;
if (*q == '~')
p = exptilde(p, q, flag);
}
start:
startloc = expdest - (char *)stackblock();
for (;;) {
length += strcspn(p + length, reject);
c = p[length];
if (c && (!(c & 0x80)
#ifdef CONFIG_ASH_MATH_SUPPORT
|| c == CTLENDARI
#endif
)) {
/* c == '=' || c == ':' || c == CTLENDARI */
length++;
}
if (length > 0) {
int newloc;
expdest = stnputs(p, length, expdest);
newloc = expdest - (char *)stackblock();
if (breakall && !inquotes && newloc > startloc) {
recordregion(startloc, newloc, 0);
}
startloc = newloc;
}
p += length + 1;
length = 0;
switch (c) {
case '\0':
goto breakloop;
case '=':
if (flag & EXP_VARTILDE2) {
p--;
continue;
}
flag |= EXP_VARTILDE2;
reject++;
/* fall through */
case ':':
/*
* sort of a hack - expand tildes in variable
* assignments (after the first '=' and after ':'s).
*/
if (*--p == '~') {
goto tilde;
}
continue;
}
switch (c) {
case CTLENDVAR: /* ??? */
goto breakloop;
case CTLQUOTEMARK:
/* "$@" syntax adherence hack */
if (
!inquotes &&
!memcmp(p, dolatstr, DOLATSTRLEN) &&
(p[4] == CTLQUOTEMARK || (
p[4] == CTLENDVAR &&
p[5] == CTLQUOTEMARK
))
) {
p = evalvar(p + 1, flag) + 1;
goto start;
}
inquotes = !inquotes;
addquote:
if (quotes) {
p--;
length++;
startloc++;
}
break;
case CTLESC:
startloc++;
length++;
goto addquote;
case CTLVAR:
p = evalvar(p, flag);
goto start;
case CTLBACKQ:
c = 0;
case CTLBACKQ|CTLQUOTE:
expbackq(argbackq->n, c, quotes);
argbackq = argbackq->next;
goto start;
#ifdef CONFIG_ASH_MATH_SUPPORT
case CTLENDARI:
p--;
expari(quotes);
goto start;
#endif
}
}
breakloop:
;
}
static char *
exptilde(char *startp, char *p, int flag)
{
char c;
char *name;
struct passwd *pw;
const char *home;
int quotes = flag & (EXP_FULL | EXP_CASE);
int startloc;
name = p + 1;
while ((c = *++p) != '\0') {
switch(c) {
case CTLESC:
return (startp);
case CTLQUOTEMARK:
return (startp);
case ':':
if (flag & EXP_VARTILDE)
goto done;
break;
case '/':
case CTLENDVAR:
goto done;
}
}
done:
*p = '\0';
if (*name == '\0') {
if ((home = lookupvar(homestr)) == NULL)
goto lose;
} else {
if ((pw = getpwnam(name)) == NULL)
goto lose;
home = pw->pw_dir;
}
if (*home == '\0')
goto lose;
*p = c;
startloc = expdest - (char *)stackblock();
strtodest(home, SQSYNTAX, quotes);
recordregion(startloc, expdest - (char *)stackblock(), 0);
return (p);
lose:
*p = c;
return (startp);
}
static void
removerecordregions(int endoff)
{
if (ifslastp == NULL)
return;
if (ifsfirst.endoff > endoff) {
while (ifsfirst.next != NULL) {
struct ifsregion *ifsp;
INTOFF;
ifsp = ifsfirst.next->next;
ckfree(ifsfirst.next);
ifsfirst.next = ifsp;
INTON;
}
if (ifsfirst.begoff > endoff)
ifslastp = NULL;
else {
ifslastp = &ifsfirst;
ifsfirst.endoff = endoff;
}
return;
}
ifslastp = &ifsfirst;
while (ifslastp->next && ifslastp->next->begoff < endoff)
ifslastp=ifslastp->next;
while (ifslastp->next != NULL) {
struct ifsregion *ifsp;
INTOFF;
ifsp = ifslastp->next->next;
ckfree(ifslastp->next);
ifslastp->next = ifsp;
INTON;
}
if (ifslastp->endoff > endoff)
ifslastp->endoff = endoff;
}
#ifdef CONFIG_ASH_MATH_SUPPORT
/*
* Expand arithmetic expression. Backup to start of expression,
* evaluate, place result in (backed up) result, adjust string position.
*/
void
expari(int quotes)
{
char *p, *start;
int begoff;
int flag;
int len;
/* ifsfree(); */
/*
* This routine is slightly over-complicated for
* efficiency. Next we scan backwards looking for the
* start of arithmetic.
*/
start = stackblock();
p = expdest - 1;
*p = '\0';
p--;
do {
int esc;
while (*p != CTLARI) {
p--;
#ifdef DEBUG
if (p < start) {
error("missing CTLARI (shouldn't happen)");
}
#endif
}
esc = esclen(start, p);
if (!(esc % 2)) {
break;
}
p -= esc + 1;
} while (1);
begoff = p - start;
removerecordregions(begoff);
flag = p[1];
expdest = p;
if (quotes)
rmescapes(p + 2);
len = cvtnum(dash_arith(p + 2));
if (flag != '"')
recordregion(begoff, begoff + len, 0);
}
#endif
/*
* Expand stuff in backwards quotes.
*/
static void
expbackq(union node *cmd, int quoted, int quotes)
{
struct backcmd in;
int i;
char buf[128];
char *p;
char *dest;
int startloc;
int syntax = quoted? DQSYNTAX : BASESYNTAX;
struct stackmark smark;
INTOFF;
setstackmark(&smark);
dest = expdest;
startloc = dest - (char *)stackblock();
grabstackstr(dest);
evalbackcmd(cmd, (struct backcmd *) &in);
popstackmark(&smark);
p = in.buf;
i = in.nleft;
if (i == 0)
goto read;
for (;;) {
memtodest(p, i, syntax, quotes);
read:
if (in.fd < 0)
break;
i = safe_read(in.fd, buf, sizeof buf);
TRACE(("expbackq: read returns %d\n", i));
if (i <= 0)
break;
p = buf;
}
if (in.buf)
ckfree(in.buf);
if (in.fd >= 0) {
close(in.fd);
back_exitstatus = waitforjob(in.jp);
}
INTON;
/* Eat all trailing newlines */
dest = expdest;
for (; dest > (char *)stackblock() && dest[-1] == '\n';)
STUNPUTC(dest);
expdest = dest;
if (quoted == 0)
recordregion(startloc, dest - (char *)stackblock(), 0);
TRACE(("evalbackq: size=%d: \"%.*s\"\n",
(dest - (char *)stackblock()) - startloc,
(dest - (char *)stackblock()) - startloc,
stackblock() + startloc));
}
static char *
scanleft(
char *startp, char *rmesc, char *rmescend, char *str, int quotes,
int zero
) {
char *loc;
char *loc2;
char c;
loc = startp;
loc2 = rmesc;
do {
int match;
const char *s = loc2;
c = *loc2;
if (zero) {
*loc2 = '\0';
s = rmesc;
}
match = pmatch(str, s);
*loc2 = c;
if (match)
return loc;
if (quotes && *loc == CTLESC)
loc++;
loc++;
loc2++;
} while (c);
return 0;
}
static char *
scanright(
char *startp, char *rmesc, char *rmescend, char *str, int quotes,
int zero
) {
int esc = 0;
char *loc;
char *loc2;
for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
int match;
char c = *loc2;
const char *s = loc2;
if (zero) {
*loc2 = '\0';
s = rmesc;
}
match = pmatch(str, s);
*loc2 = c;
if (match)
return loc;
loc--;
if (quotes) {
if (--esc < 0) {
esc = esclen(startp, loc);
}
if (esc % 2) {
esc--;
loc--;
}
}
}
return 0;
}
static const char *
subevalvar(char *p, char *str, int strloc, int subtype, int startloc, int varflags, int quotes)
{
char *startp;
char *loc;
int saveherefd = herefd;
struct nodelist *saveargbackq = argbackq;
int amount;
char *rmesc, *rmescend;
int zero;
char *(*scan)(char *, char *, char *, char *, int , int);
herefd = -1;
argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
STPUTC('\0', expdest);
herefd = saveherefd;
argbackq = saveargbackq;
startp = stackblock() + startloc;
switch (subtype) {
case VSASSIGN:
setvar(str, startp, 0);
amount = startp - expdest;
STADJUST(amount, expdest);
return startp;
case VSQUESTION:
varunset(p, str, startp, varflags);
/* NOTREACHED */
}
subtype -= VSTRIMRIGHT;
#ifdef DEBUG
if (subtype < 0 || subtype > 3)
abort();
#endif
rmesc = startp;
rmescend = stackblock() + strloc;
if (quotes) {
rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
if (rmesc != startp) {
rmescend = expdest;
startp = stackblock() + startloc;
}
}
rmescend--;
str = stackblock() + strloc;
preglob(str, varflags & VSQUOTE, 0);
/* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
zero = subtype >> 1;
/* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
scan = (subtype & 1) ^ zero ? scanleft : scanright;
loc = scan(startp, rmesc, rmescend, str, quotes, zero);
if (loc) {
if (zero) {
memmove(startp, loc, str - loc);
loc = startp + (str - loc) - 1;
}
*loc = '\0';
amount = loc - expdest;
STADJUST(amount, expdest);
}
return loc;
}
/*
* Expand a variable, and return a pointer to the next character in the
* input string.
*/
static char *
evalvar(char *p, int flag)
{
int subtype;
int varflags;
char *var;
int patloc;
int c;
int set;
int startloc;
size_t varlen;
int easy;
int quotes;
int quoted;
quotes = flag & (EXP_FULL | EXP_CASE);
varflags = *p++;
subtype = varflags & VSTYPE;
quoted = varflags & VSQUOTE;
var = p;
easy = (!quoted || (*var == '@' && shellparam.nparam));
varlen = 0;
startloc = expdest - (char *)stackblock();
p = strchr(p, '=') + 1;
if (!is_name(*var)) {
set = varisset(var, varflags & VSNUL);
set--;
if (subtype == VSPLUS)
goto vsplus;
if (++set) {
varvalue(var, quoted, flag);
if (subtype == VSLENGTH) {
varlen =
expdest - (char *)stackblock() -
startloc;
STADJUST(-varlen, expdest);
goto vslen;
}
}
} else {
const char *val;
again:
/* jump here after setting a variable with ${var=text} */
val = lookupvar(var);
set = !val || ((varflags & VSNUL) && !*val);
if (subtype == VSPLUS)
goto vsplus;
if (--set) {
varlen = strlen(val);
if (subtype == VSLENGTH)
goto vslen;
memtodest(
val, varlen, quoted ? DQSYNTAX : BASESYNTAX,
quotes
);
}
}
if (subtype == VSMINUS) {
vsplus:
if (!set) {
argstr(
p, flag | EXP_TILDE |
(quoted ? EXP_QWORD : EXP_WORD)
);
goto end;
}
if (easy)
goto record;
goto end;
}
if (subtype == VSASSIGN || subtype == VSQUESTION) {
if (!set) {
if (subevalvar(p, var, 0, subtype, startloc,
varflags, 0)) {
varflags &= ~VSNUL;
/*
* Remove any recorded regions beyond
* start of variable
*/
removerecordregions(startloc);
goto again;
}
goto end;
}
if (easy)
goto record;
goto end;
}
if (!set && uflag)
varunset(p, var, 0, 0);
if (subtype == VSLENGTH) {
vslen:
cvtnum(varlen);
goto record;
}
if (subtype == VSNORMAL) {
if (!easy)
goto end;
record:
recordregion(startloc, expdest - (char *)stackblock(), quoted);
goto end;
}
#ifdef DEBUG
switch (subtype) {
case VSTRIMLEFT:
case VSTRIMLEFTMAX:
case VSTRIMRIGHT:
case VSTRIMRIGHTMAX:
break;
default:
abort();
}
#endif
if (set) {
/*
* Terminate the string and start recording the pattern
* right after it
*/
STPUTC('\0', expdest);
patloc = expdest - (char *)stackblock();
if (subevalvar(p, NULL, patloc, subtype,
startloc, varflags, quotes) == 0) {
int amount = expdest - (
(char *)stackblock() + patloc - 1
);
STADJUST(-amount, expdest);
}
/* Remove any recorded regions beyond start of variable */
removerecordregions(startloc);
goto record;
}
end:
if (subtype != VSNORMAL) { /* skip to end of alternative */
int nesting = 1;
for (;;) {
if ((c = *p++) == CTLESC)
p++;
else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
if (set)
argbackq = argbackq->next;
} else if (c == CTLVAR) {
if ((*p++ & VSTYPE) != VSNORMAL)
nesting++;
} else if (c == CTLENDVAR) {
if (--nesting == 0)
break;
}
}
}
return p;
}
/*
* Test whether a specialized variable is set.
*/
static int
varisset(char *name, int nulok)
{
if (*name == '!')
return backgndpid != 0;
else if (*name == '@' || *name == '*') {
if (*shellparam.p == NULL)
return 0;
if (nulok) {
char **av;
for (av = shellparam.p; *av; av++)
if (**av != '\0')
return 1;
return 0;
}
} else if (is_digit(*name)) {
char *ap;
int num = atoi(name);
if (num > shellparam.nparam)
return 0;
if (num == 0)
ap = arg0;
else
ap = shellparam.p[num - 1];
if (nulok && (ap == NULL || *ap == '\0'))
return 0;
}
return 1;
}
/*
* Put a string on the stack.
*/
static void
memtodest(const char *p, size_t len, int syntax, int quotes) {
char *q = expdest;
q = makestrspace(len * 2, q);
while (len--) {
int c = *p++;
if (!c)
continue;
if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
USTPUTC(CTLESC, q);
USTPUTC(c, q);
}
expdest = q;
}
static void
strtodest(const char *p, int syntax, int quotes)
{
memtodest(p, strlen(p), syntax, quotes);
}
/*
* Add the value of a specialized variable to the stack string.
*/
static void
varvalue(char *name, int quoted, int flags)
{
int num;
char *p;
int i;
int sep;
int sepq = 0;
char **ap;
int syntax;
int allow_split = flags & EXP_FULL;
int quotes = flags & (EXP_FULL | EXP_CASE);
syntax = quoted ? DQSYNTAX : BASESYNTAX;
switch (*name) {
case '$':
num = rootpid;
goto numvar;
case '?':
num = exitstatus;
goto numvar;
case '#':
num = shellparam.nparam;
goto numvar;
case '!':
num = backgndpid;
numvar:
cvtnum(num);
break;
case '-':
for (i = 0 ; i < NOPTS ; i++) {
if (optlist[i])
STPUTC(optletters(i), expdest);
}
break;
case '@':
if (allow_split && quoted) {
sep = 1 << CHAR_BIT;
goto param;
}
/* fall through */
case '*':
sep = ifsset() ? ifsval()[0] : ' ';
if (quotes) {
sepq = (SIT(sep, syntax) == CCTL) || (SIT(sep, syntax) == CBACK);
}
param:
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
strtodest(p, syntax, quotes);
if (*ap && sep) {
p = expdest;
if (sepq)
STPUTC(CTLESC, p);
STPUTC(sep, p);
expdest = p;
}
}
break;
case '0':
strtodest(arg0, syntax, quotes);
break;
default:
num = atoi(name);
if (num > 0 && num <= shellparam.nparam) {
strtodest(shellparam.p[num - 1], syntax, quotes);
}
break;
}
}
/*
* Record the fact that we have to scan this region of the
* string for IFS characters.
*/
static void
recordregion(int start, int end, int nulonly)
{
struct ifsregion *ifsp;
if (ifslastp == NULL) {
ifsp = &ifsfirst;
} else {
INTOFF;
ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
ifsp->next = NULL;
ifslastp->next = ifsp;
INTON;
}
ifslastp = ifsp;
ifslastp->begoff = start;
ifslastp->endoff = end;
ifslastp->nulonly = nulonly;
}
/*
* Break the argument string into pieces based upon IFS and add the
* strings to the argument list. The regions of the string to be
* searched for IFS characters have been stored by recordregion.
*/
static void
ifsbreakup(char *string, struct arglist *arglist)
{
struct ifsregion *ifsp;
struct strlist *sp;
char *start;
char *p;
char *q;
const char *ifs, *realifs;
int ifsspc;
int nulonly;
start = string;
if (ifslastp != NULL) {
ifsspc = 0;
nulonly = 0;
realifs = ifsset() ? ifsval() : defifs;
ifsp = &ifsfirst;
do {
p = string + ifsp->begoff;
nulonly = ifsp->nulonly;
ifs = nulonly ? nullstr : realifs;
ifsspc = 0;
while (p < string + ifsp->endoff) {
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p)) {
if (!nulonly)
ifsspc = (strchr(defifs, *p) != NULL);
/* Ignore IFS whitespace at start */
if (q == start && ifsspc) {
p++;
start = p;
continue;
}
*q = '\0';
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
p++;
if (!nulonly) {
for (;;) {
if (p >= string + ifsp->endoff) {
break;
}
q = p;
if (*p == CTLESC)
p++;
if (strchr(ifs, *p) == NULL ) {
p = q;
break;
} else if (strchr(defifs, *p) == NULL) {
if (ifsspc) {
p++;
ifsspc = 0;
} else {
p = q;
break;
}
} else
p++;
}
}
start = p;
} else
p++;
}
} while ((ifsp = ifsp->next) != NULL);
if (nulonly)
goto add;
}
if (!*start)
return;
add:
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = start;
*arglist->lastp = sp;
arglist->lastp = &sp->next;
}
static void
ifsfree(void)
{
struct ifsregion *p;
INTOFF;
p = ifsfirst.next;
do {
struct ifsregion *ifsp;
ifsp = p->next;
ckfree(p);
p = ifsp;
} while (p);
ifslastp = NULL;
ifsfirst.next = NULL;
INTON;
}
/*
* Expand shell metacharacters. At this point, the only control characters
* should be escapes. The results are stored in the list exparg.
*/
static void
expandmeta(str, flag)
struct strlist *str;
int flag;
{
/* TODO - EXP_REDIR */
while (str) {
const char *p;
glob_t pglob;
int i;
if (fflag)
goto nometa;
INTOFF;
p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
i = glob(p, GLOB_NOMAGIC, 0, &pglob);
if (p != str->text)
ckfree(p);
switch (i) {
case 0:
if (!(pglob.gl_flags & GLOB_MAGCHAR))
goto nometa2;
addglob(&pglob);
globfree(&pglob);
INTON;
break;
case GLOB_NOMATCH:
nometa2:
globfree(&pglob);
INTON;
nometa:
*exparg.lastp = str;
rmescapes(str->text);
exparg.lastp = &str->next;
break;
default: /* GLOB_NOSPACE */
error(bb_msg_memory_exhausted);
}
str = str->next;
}
}
/*
* Add the result of glob(3) to the list.
*/
static void
addglob(pglob)
const glob_t *pglob;
{
char **p = pglob->gl_pathv;
do {
addfname(*p);
} while (*++p);
}
/*
* Add a file name to the list.
*/
static void
addfname(char *name)
{
struct strlist *sp;
sp = (struct strlist *)stalloc(sizeof *sp);
sp->text = sstrdup(name);
*exparg.lastp = sp;
exparg.lastp = &sp->next;
}
/*
* Returns true if the pattern matches the string.
*/
static inline int
patmatch(char *pattern, const char *string)
{
return pmatch(preglob(pattern, 0, 0), string);
}
/*
* Remove any CTLESC characters from a string.
*/
static char *
_rmescapes(char *str, int flag)
{
char *p, *q, *r;
static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
unsigned inquotes;
int notescaped;
int globbing;
p = strpbrk(str, qchars);
if (!p) {
return str;
}
q = p;
r = str;
if (flag & RMESCAPE_ALLOC) {
size_t len = p - str;
size_t fulllen = len + strlen(p) + 1;
if (flag & RMESCAPE_GROW) {
r = makestrspace(fulllen, expdest);
} else if (flag & RMESCAPE_HEAP) {
r = ckmalloc(fulllen);
} else {
r = stalloc(fulllen);
}
q = r;
if (len > 0) {
q = mempcpy(q, str, len);
}
}
inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
globbing = flag & RMESCAPE_GLOB;
notescaped = globbing;
while (*p) {
if (*p == CTLQUOTEMARK) {
inquotes = ~inquotes;
p++;
notescaped = globbing;
continue;
}
if (*p == '\\') {
/* naked back slash */
notescaped = 0;
goto copy;
}
if (*p == CTLESC) {
p++;
if (notescaped && inquotes && *p != '/') {
*q++ = '\\';
}
}
notescaped = globbing;
copy:
*q++ = *p++;
}
*q = '\0';
if (flag & RMESCAPE_GROW) {
expdest = r;
STADJUST(q - r + 1, expdest);
}
return r;
}
/*
* See if a pattern matches in a case statement.
*/
int
casematch(union node *pattern, char *val)
{
struct stackmark smark;
int result;
setstackmark(&smark);
argbackq = pattern->narg.backquote;
STARTSTACKSTR(expdest);
ifslastp = NULL;
argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
STACKSTRNUL(expdest);
result = patmatch(stackblock(), val);
popstackmark(&smark);
return result;
}
/*
* Our own itoa().
*/
static int
cvtnum(long num)
{
int len;
expdest = makestrspace(32, expdest);
len = fmtstr(expdest, 32, "%ld", num);
STADJUST(len, expdest);
return len;
}
static void
varunset(const char *end, const char *var, const char *umsg, int varflags)
{
const char *msg;
const char *tail;
tail = nullstr;
msg = "parameter not set";
if (umsg) {
if (*end == CTLENDVAR) {
if (varflags & VSNUL)
tail = " or null";
} else
msg = umsg;
}
error("%.*s: %s%s", end - var - 1, var, msg, tail);
}
/* $NetBSD: input.c,v 1.37 2002/11/24 22:35:40 christos Exp $ */
/*
* This file implements the input routines used by the parser.
*/
#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
#define IBUFSIZ (BUFSIZ + 1)
static void pushfile(void);
/*
* Read a line from the script.
*/
static inline char *
pfgets(char *line, int len)
{
char *p = line;
int nleft = len;
int c;
while (--nleft > 0) {
c = pgetc2();
if (c == PEOF) {
if (p == line)
return NULL;
break;
}
*p++ = c;
if (c == '\n')
break;
}
*p = '\0';
return line;
}
/*
* Read a character from the script, returning PEOF on end of file.
* Nul characters in the input are silently discarded.
*/
#define pgetc_as_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer())
#ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
#define pgetc_macro() pgetc()
static int
pgetc(void)
{
return pgetc_as_macro();
}
#else
#define pgetc_macro() pgetc_as_macro()
static int
pgetc(void)
{
return pgetc_macro();
}
#endif
/*
* Same as pgetc(), but ignores PEOA.
*/
#ifdef CONFIG_ASH_ALIAS
static int pgetc2(void)
{
int c;
do {
c = pgetc_macro();
} while (c == PEOA);
return c;
}
#else
static inline int pgetc2(void)
{
return pgetc_macro();
}
#endif
#ifdef CONFIG_FEATURE_COMMAND_EDITING
static const char *cmdedit_prompt;
static inline void putprompt(const char *s)
{
cmdedit_prompt = s;
}
#else
static inline void putprompt(const char *s)
{
out2str(s);
}
#endif
static inline int
preadfd(void)
{
int nr;
char *buf = parsefile->buf;
parsenextc = buf;
retry:
#ifdef CONFIG_FEATURE_COMMAND_EDITING
if (!iflag || parsefile->fd)
nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
else {
nr = cmdedit_read_input((char *) cmdedit_prompt, buf);
if(nr == 0) {
/* Ctrl+C presend */
raise(SIGINT);
goto retry;
}
if(nr < 0) {
/* Ctrl+D presend */
nr = 0;
}
}
#else
nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
#endif
if (nr < 0) {
if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
int flags = fcntl(0, F_GETFL, 0);
if (flags >= 0 && flags & O_NONBLOCK) {
flags &=~ O_NONBLOCK;
if (fcntl(0, F_SETFL, flags) >= 0) {
out2str("sh: turning off NDELAY mode\n");
goto retry;
}
}
}
}
return nr;
}
/*
* Refill the input buffer and return the next input character:
*
* 1) If a string was pushed back on the input, pop it;
* 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
* from a string so we can't refill the buffer, return EOF.
* 3) If the is more stuff in this buffer, use it else call read to fill it.
* 4) Process input up to the next newline, deleting nul characters.
*/
int
preadbuffer(void)
{
char *p, *q;
int more;
char savec;
while (parsefile->strpush) {
#ifdef CONFIG_ASH_ALIAS
if (parsenleft == -1 && parsefile->strpush->ap &&
parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
return PEOA;
}
#endif
popstring();
if (--parsenleft >= 0)
return (*parsenextc++);
}
if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
return PEOF;
flushall();
again:
if (parselleft <= 0) {
if ((parselleft = preadfd()) <= 0) {
parselleft = parsenleft = EOF_NLEFT;
return PEOF;
}
}
q = p = parsenextc;
/* delete nul characters */
for (more = 1; more;) {
switch (*p) {
case '\0':
p++; /* Skip nul */
goto check;
case '\n':
parsenleft = q - parsenextc;
more = 0; /* Stop processing here */
break;
}
*q++ = *p++;
check:
if (--parselleft <= 0 && more) {
parsenleft = q - parsenextc - 1;
if (parsenleft < 0)
goto again;
more = 0;
}
}
savec = *q;
*q = '\0';
if (vflag) {
out2str(parsenextc);
flushout(stderr);
}
*q = savec;
return *parsenextc++;
}
/*
* Undo the last call to pgetc. Only one character may be pushed back.
* PEOF may be pushed back.
*/
void
pungetc(void)
{
parsenleft++;
parsenextc--;
}
/*
* Push a string back onto the input at this current parsefile level.
* We handle aliases this way.
*/
void
pushstring(char *s, void *ap)
{
struct strpush *sp;
size_t len;
len = strlen(s);
INTOFF;
/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
if (parsefile->strpush) {
sp = ckmalloc(sizeof (struct strpush));
sp->prev = parsefile->strpush;
parsefile->strpush = sp;
} else
sp = parsefile->strpush = &(parsefile->basestrpush);
sp->prevstring = parsenextc;
sp->prevnleft = parsenleft;
#ifdef CONFIG_ASH_ALIAS
sp->ap = (struct alias *)ap;
if (ap) {
((struct alias *)ap)->flag |= ALIASINUSE;
sp->string = s;
}
#endif
parsenextc = s;
parsenleft = len;
INTON;
}
void
popstring(void)
{
struct strpush *sp = parsefile->strpush;
INTOFF;
#ifdef CONFIG_ASH_ALIAS
if (sp->ap) {
if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
checkkwd |= CHKALIAS;
}
if (sp->string != sp->ap->val) {
ckfree(sp->string);
}
sp->ap->flag &= ~ALIASINUSE;
if (sp->ap->flag & ALIASDEAD) {
unalias(sp->ap->name);
}
}
#endif
parsenextc = sp->prevstring;
parsenleft = sp->prevnleft;
/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
parsefile->strpush = sp->prev;
if (sp != &(parsefile->basestrpush))
ckfree(sp);
INTON;
}
/*
* Set the input to take input from a file. If push is set, push the
* old input onto the stack first.
*/
void
setinputfile(const char *fname, int push)
{
int fd;
int fd2;
INTOFF;
if ((fd = open(fname, O_RDONLY)) < 0)
error("Can't open %s", fname);
if (fd < 10) {
fd2 = copyfd(fd, 10);
close(fd);
if (fd2 < 0)
error("Out of file descriptors");
fd = fd2;
}
setinputfd(fd, push);
INTON;
}
/*
* Like setinputfile, but takes an open file descriptor. Call this with
* interrupts off.
*/
static void
setinputfd(int fd, int push)
{
(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
if (push) {
pushfile();
parsefile->buf = 0;
}
parsefile->fd = fd;
if (parsefile->buf == NULL)
parsefile->buf = ckmalloc(IBUFSIZ);
parselleft = parsenleft = 0;
plinno = 1;
}
/*
* Like setinputfile, but takes input from a string.
*/
static void
setinputstring(char *string)
{
INTOFF;
pushfile();
parsenextc = string;
parsenleft = strlen(string);
parsefile->buf = NULL;
plinno = 1;
INTON;
}
/*
* To handle the "." command, a stack of input files is used. Pushfile
* adds a new entry to the stack and popfile restores the previous level.
*/
static void
pushfile(void)
{
struct parsefile *pf;
parsefile->nleft = parsenleft;
parsefile->lleft = parselleft;
parsefile->nextc = parsenextc;
parsefile->linno = plinno;
pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
pf->prev = parsefile;
pf->fd = -1;
pf->strpush = NULL;
pf->basestrpush.prev = NULL;
parsefile = pf;
}
static void
popfile(void)
{
struct parsefile *pf = parsefile;
INTOFF;
if (pf->fd >= 0)
close(pf->fd);
if (pf->buf)
ckfree(pf->buf);
while (pf->strpush)
popstring();
parsefile = pf->prev;
ckfree(pf);
parsenleft = parsefile->nleft;
parselleft = parsefile->lleft;
parsenextc = parsefile->nextc;
plinno = parsefile->linno;
INTON;
}
/*
* Return to top level.
*/
static void
popallfiles(void)
{
while (parsefile != &basepf)
popfile();
}
/*
* Close the file(s) that the shell is reading commands from. Called
* after a fork is done.
*/
static void
closescript(void)
{
popallfiles();
if (parsefile->fd > 0) {
close(parsefile->fd);
parsefile->fd = 0;
}
}
/* $NetBSD: jobs.c,v 1.56 2002/11/25 12:13:03 agc Exp $ */
/* mode flags for set_curjob */
#define CUR_DELETE 2
#define CUR_RUNNING 1
#define CUR_STOPPED 0
/* mode flags for dowait */
#define DOWAIT_NORMAL 0
#define DOWAIT_BLOCK 1
/* array of jobs */
static struct job *jobtab;
/* size of array */
static unsigned njobs;
#if JOBS
/* pgrp of shell on invocation */
static int initialpgrp;
static int ttyfd = -1;
#endif
/* current job */
static struct job *curjob;
/* number of presumed living untracked jobs */
static int jobless;
static void set_curjob(struct job *, unsigned);
#if JOBS
static int restartjob(struct job *, int);
static void xtcsetpgrp(int, pid_t);
static char *commandtext(union node *);
static void cmdlist(union node *, int);
static void cmdtxt(union node *);
static void cmdputs(const char *);
static void showpipe(struct job *, FILE *);
#endif
static int sprint_status(char *, int, int);
static void freejob(struct job *);
static struct job *getjob(const char *, int);
static struct job *growjobtab(void);
static void forkchild(struct job *, union node *, int);
static void forkparent(struct job *, union node *, int, pid_t);
static int dowait(int, struct job *);
static int getstatus(struct job *);
static void
set_curjob(struct job *jp, unsigned mode)
{
struct job *jp1;
struct job **jpp, **curp;
/* first remove from list */
jpp = curp = &curjob;
do {
jp1 = *jpp;
if (jp1 == jp)
break;
jpp = &jp1->prev_job;
} while (1);
*jpp = jp1->prev_job;
/* Then re-insert in correct position */
jpp = curp;
switch (mode) {
default:
#ifdef DEBUG
abort();
#endif
case CUR_DELETE:
/* job being deleted */
break;
case CUR_RUNNING:
/* newly created job or backgrounded job,
put after all stopped jobs. */
do {
jp1 = *jpp;
#ifdef JOBS
if (!jp1 || jp1->state != JOBSTOPPED)
#endif
break;
jpp = &jp1->prev_job;
} while (1);
/* FALLTHROUGH */
#ifdef JOBS
case CUR_STOPPED:
#endif
/* newly stopped job - becomes curjob */
jp->prev_job = *jpp;
*jpp = jp;
break;
}
}
#if JOBS
/*
* Turn job control on and off.
*
* Note: This code assumes that the third arg to ioctl is a character
* pointer, which is true on Berkeley systems but not System V. Since
* System V doesn't have job control yet, this isn't a problem now.
*
* Called with interrupts off.
*/
void
setjobctl(int on)
{
int fd;
int pgrp;
if (on == jobctl || rootshell == 0)
return;
if (on) {
int ofd;
ofd = fd = open(_PATH_TTY, O_RDWR);
if (fd < 0) {
fd += 3;
while (!isatty(fd) && --fd >= 0)
;
}
fd = fcntl(fd, F_DUPFD, 10);
close(ofd);
if (fd < 0)
goto out;
fcntl(fd, F_SETFD, FD_CLOEXEC);
do { /* while we are in the background */
if ((pgrp = tcgetpgrp(fd)) < 0) {
out:
sh_warnx("can't access tty; job control turned off");
mflag = on = 0;
goto close;
}
if (pgrp == getpgrp())
break;
killpg(0, SIGTTIN);
} while (1);
initialpgrp = pgrp;
setsignal(SIGTSTP);
setsignal(SIGTTOU);
setsignal(SIGTTIN);
pgrp = rootpid;
setpgid(0, pgrp);
xtcsetpgrp(fd, pgrp);
} else {
/* turning job control off */
fd = ttyfd;
pgrp = initialpgrp;
xtcsetpgrp(fd, pgrp);
setpgid(0, pgrp);
setsignal(SIGTSTP);
setsignal(SIGTTOU);
setsignal(SIGTTIN);
close:
close(fd);
fd = -1;
}
ttyfd = fd;
jobctl = on;
}
static int
killcmd(argc, argv)
int argc;
char **argv;
{
int signo = -1;
int list = 0;
int i;
pid_t pid;
struct job *jp;
if (argc <= 1) {
usage:
error(
"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
"kill -l [exitstatus]"
);
}
if (**++argv == '-') {
signo = decode_signal(*argv + 1, 1);
if (signo < 0) {
int c;
while ((c = nextopt("ls:")) != '\0')
switch (c) {
default:
#ifdef DEBUG
abort();
#endif
case 'l':
list = 1;
break;
case 's':
signo = decode_signal(optionarg, 1);
if (signo < 0) {
error(
"invalid signal number or name: %s",
optionarg
);
}
break;
}
argv = argptr;
} else
argv++;
}
if (!list && signo < 0)
signo = SIGTERM;
if ((signo < 0 || !*argv) ^ list) {
goto usage;
}
if (list) {
const char *name;
if (!*argv) {
for (i = 1; i < NSIG; i++) {
name = u_signal_names(0, &i, 1);
if (name)
out1fmt(snlfmt, name);
}
return 0;
}
name = u_signal_names(*argptr, &signo, -1);
if (name)
out1fmt(snlfmt, name);
else
error("invalid signal number or exit status: %s", *argptr);
return 0;
}
i = 0;
do {
if (**argv == '%') {
jp = getjob(*argv, 0);
pid = -jp->ps[0].pid;
} else
pid = number(*argv);
if (kill(pid, signo) != 0) {
sh_warnx("%m\n");
i = 1;
}
} while (*++argv);
return i;
}
#endif /* JOBS */
#if defined(JOBS) || defined(DEBUG)
static int
jobno(const struct job *jp)
{
return jp - jobtab + 1;
}
#endif
#ifdef JOBS
static int
fgcmd(int argc, char **argv)
{
struct job *jp;
FILE *out;
int mode;
int retval;
mode = (**argv == 'f') ? FORK_FG : FORK_BG;
nextopt(nullstr);
argv = argptr;
out = stdout;
do {
jp = getjob(*argv, 1);
if (mode == FORK_BG) {
set_curjob(jp, CUR_RUNNING);
fprintf(out, "[%d] ", jobno(jp));
}
outstr(jp->ps->cmd, out);
showpipe(jp, out);
retval = restartjob(jp, mode);
} while (*argv && *++argv);
return retval;
}
static int bgcmd(int, char **) __attribute__((__alias__("fgcmd")));
static int
restartjob(struct job *jp, int mode)
{
struct procstat *ps;
int i;
int status;
pid_t pgid;
INTOFF;
if (jp->state == JOBDONE)
goto out;
jp->state = JOBRUNNING;
pgid = jp->ps->pid;
if (mode == FORK_FG)
xtcsetpgrp(ttyfd, pgid);
killpg(pgid, SIGCONT);
ps = jp->ps;
i = jp->nprocs;
do {
if (WIFSTOPPED(ps->status)) {
ps->status = -1;
}
} while (ps++, --i);
out:
status = (mode == FORK_FG) ? waitforjob(jp) : 0;
INTON;
return status;
}
#endif
static int
sprint_status(char *s, int status, int sigonly)
{
int col;
int st;
col = 0;
st = WEXITSTATUS(status);
if (!WIFEXITED(status)) {
st = WSTOPSIG(status);
#if JOBS
if (!WIFSTOPPED(status))
st = WTERMSIG(status);
#endif
if (sigonly) {
if (st == SIGINT || st == SIGPIPE)
goto out;
if (WIFSTOPPED(status))
goto out;
}
st &= 0x7f;
col = fmtstr(s, 32, u_signal_names(NULL, &st, 0));
if (WCOREDUMP(status)) {
col += fmtstr(s + col, 16, " (core dumped)");
}
} else if (!sigonly) {
if (st)
col = fmtstr(s, 16, "Done(%d)", st);
else
col = fmtstr(s, 16, "Done");
}
out:
return col;
}
#if JOBS
static void
showjob(FILE *out, struct job *jp, int mode)
{
struct procstat *ps;
struct procstat *psend;
int col;
int indent;
char s[80];
ps = jp->ps;
if (mode & SHOW_PGID) {
/* just output process (group) id of pipeline */
fprintf(out, "%d\n", ps->pid);
return;
}
col = fmtstr(s, 16, "[%d] ", jobno(jp));
indent = col;
if (jp == curjob)
s[col - 2] = '+';
else if (curjob && jp == curjob->prev_job)
s[col - 2] = '-';
if (mode & SHOW_PID)
col += fmtstr(s + col, 16, "%d ", ps->pid);
psend = ps + jp->nprocs;
if (jp->state == JOBRUNNING) {
scopy("Running", s + col);
col += strlen("Running");
} else {
int status = psend[-1].status;
#if JOBS
if (jp->state == JOBSTOPPED)
status = jp->stopstatus;
#endif
col += sprint_status(s + col, status, 0);
}
goto start;
do {
/* for each process */
col = fmtstr(s, 48, " |\n%*c%d ", indent, ' ', ps->pid) - 3;
start:
fprintf(
out, "%s%*c%s",
s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd
);
if (!(mode & SHOW_PID)) {
showpipe(jp, out);
break;
}
if (++ps == psend) {
outcslow('\n', out);
break;
}
} while (1);
jp->changed = 0;
if (jp->state == JOBDONE) {
TRACE(("showjob: freeing job %d\n", jobno(jp)));
freejob(jp);
}
}
static int
jobscmd(int argc, char **argv)
{
int mode, m;
FILE *out;
mode = 0;
while ((m = nextopt("lp")))
if (m == 'l')
mode = SHOW_PID;
else
mode = SHOW_PGID;
out = stdout;
argv = argptr;
if (*argv)
do
showjob(out, getjob(*argv,0), mode);
while (*++argv);
else
showjobs(out, mode);
return 0;
}
/*
* Print a list of jobs. If "change" is nonzero, only print jobs whose
* statuses have changed since the last call to showjobs.
*/
static void
showjobs(FILE *out, int mode)
{
struct job *jp;
TRACE(("showjobs(%x) called\n", mode));
/* If not even one one job changed, there is nothing to do */
while (dowait(DOWAIT_NORMAL, NULL) > 0)
continue;
for (jp = curjob; jp; jp = jp->prev_job) {
if (!(mode & SHOW_CHANGED) || jp->changed)
showjob(out, jp, mode);
}
}
#endif /* JOBS */
/*
* Mark a job structure as unused.
*/
static void
freejob(struct job *jp)
{
struct procstat *ps;
int i;
INTOFF;
for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
if (ps->cmd != nullstr)
ckfree(ps->cmd);
}
if (jp->ps != &jp->ps0)
ckfree(jp->ps);
jp->used = 0;
set_curjob(jp, CUR_DELETE);
INTON;
}
static int
waitcmd(int argc, char **argv)
{
struct job *job;
int retval;
struct job *jp;
EXSIGON();
nextopt(nullstr);
retval = 0;
argv = argptr;
if (!*argv) {
/* wait for all jobs */
for (;;) {
jp = curjob;
while (1) {
if (!jp) {
/* no running procs */
goto out;
}
if (jp->state == JOBRUNNING)
break;
jp->waited = 1;
jp = jp->prev_job;
}
dowait(DOWAIT_BLOCK, 0);
}
}
retval = 127;
do {
if (**argv != '%') {
pid_t pid = number(*argv);
job = curjob;
goto start;
do {
if (job->ps[job->nprocs - 1].pid == pid)
break;
job = job->prev_job;
start:
if (!job)
goto repeat;
} while (1);
} else
job = getjob(*argv, 0);
/* loop until process terminated or stopped */
while (job->state == JOBRUNNING)
dowait(DOWAIT_BLOCK, 0);
job->waited = 1;
retval = getstatus(job);
repeat:
;
} while (*++argv);
out:
return retval;
}
/*
* Convert a job name to a job structure.
*/
static struct job *
getjob(const char *name, int getctl)
{
struct job *jp;
struct job *found;
const char *err_msg = "No such job: %s";
unsigned num;
int c;
const char *p;
char *(*match)(const char *, const char *);
jp = curjob;
p = name;
if (!p)
goto currentjob;
if (*p != '%')
goto err;
c = *++p;
if (!c)
goto currentjob;
if (!p[1]) {
if (c == '+' || c == '%') {
currentjob:
err_msg = "No current job";
goto check;
} else if (c == '-') {
if (jp)
jp = jp->prev_job;
err_msg = "No previous job";
check:
if (!jp)
goto err;
goto gotit;
}
}
if (is_number(p)) {
num = atoi(p);
if (num < njobs) {
jp = jobtab + num - 1;
if (jp->used)
goto gotit;
goto err;
}
}
match = prefix;
if (*p == '?') {
match = strstr;
p++;
}
found = 0;
while (1) {
if (!jp)
goto err;
if (match(jp->ps[0].cmd, p)) {
if (found)
goto err;
found = jp;
err_msg = "%s: ambiguous";
}
jp = jp->prev_job;
}
gotit:
#if JOBS
err_msg = "job %s not created under job control";
if (getctl && jp->jobctl == 0)
goto err;
#endif
return jp;
err:
error(err_msg, name);
}
/*
* Return a new job structure.
* Called with interrupts off.
*/
static struct job *
makejob(union node *node, int nprocs)
{
int i;
struct job *jp;
for (i = njobs, jp = jobtab ; ; jp++) {
if (--i < 0) {
jp = growjobtab();
break;
}
if (jp->used == 0)
break;
if (jp->state != JOBDONE || !jp->waited)
continue;
#if JOBS
if (jobctl)
continue;
#endif
freejob(jp);
break;
}
memset(jp, 0, sizeof(*jp));
#if JOBS
if (jobctl)
jp->jobctl = 1;
#endif
jp->prev_job = curjob;
curjob = jp;
jp->used = 1;
jp->ps = &jp->ps0;
if (nprocs > 1) {
jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
}
TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
jobno(jp)));
return jp;
}
static struct job *
growjobtab(void)
{
size_t len;
ptrdiff_t offset;
struct job *jp, *jq;
len = njobs * sizeof(*jp);
jq = jobtab;
jp = ckrealloc(jq, len + 4 * sizeof(*jp));
offset = (char *)jp - (char *)jq;
if (offset) {
/* Relocate pointers */
size_t l = len;
jq = (struct job *)((char *)jq + l);
while (l) {
l -= sizeof(*jp);
jq--;
#define joff(p) ((struct job *)((char *)(p) + l))
#define jmove(p) (p) = (void *)((char *)(p) + offset)
if (likely(joff(jp)->ps == &jq->ps0))
jmove(joff(jp)->ps);
if (joff(jp)->prev_job)
jmove(joff(jp)->prev_job);
}
if (curjob)
jmove(curjob);
#undef joff
#undef jmove
}
njobs += 4;
jobtab = jp;
jp = (struct job *)((char *)jp + len);
jq = jp + 3;
do {
jq->used = 0;
} while (--jq >= jp);
return jp;
}
/*
* Fork off a subshell. If we are doing job control, give the subshell its
* own process group. Jp is a job structure that the job is to be added to.
* N is the command that will be evaluated by the child. Both jp and n may
* be NULL. The mode parameter can be one of the following:
* FORK_FG - Fork off a foreground process.
* FORK_BG - Fork off a background process.
* FORK_NOJOB - Like FORK_FG, but don't give the process its own
* process group even if job control is on.
*
* When job control is turned off, background processes have their standard
* input redirected to /dev/null (except for the second and later processes
* in a pipeline).
*
* Called with interrupts off.
*/
static inline void
forkchild(struct job *jp, union node *n, int mode)
{
int wasroot;
TRACE(("Child shell %d\n", getpid()));
wasroot = rootshell;
rootshell = 0;
closescript();
clear_traps();
#if JOBS
/* do job control only in root shell */
jobctl = 0;
if (mode != FORK_NOJOB && jp->jobctl && wasroot) {
pid_t pgrp;
if (jp->nprocs == 0)
pgrp = getpid();
else
pgrp = jp->ps[0].pid;
/* This can fail because we are doing it in the parent also */
(void)setpgid(0, pgrp);
if (mode == FORK_FG)
xtcsetpgrp(ttyfd, pgrp);
setsignal(SIGTSTP);
setsignal(SIGTTOU);
} else
#endif
if (mode == FORK_BG) {
ignoresig(SIGINT);
ignoresig(SIGQUIT);
if (jp->nprocs == 0) {
close(0);
if (open(_PATH_DEVNULL, O_RDONLY) != 0)
error("Can't open %s", _PATH_DEVNULL);
}
}
if (wasroot && iflag) {
setsignal(SIGINT);
setsignal(SIGQUIT);
setsignal(SIGTERM);
}
for (jp = curjob; jp; jp = jp->prev_job)
freejob(jp);
jobless = 0;
}
static inline void
forkparent(struct job *jp, union node *n, int mode, pid_t pid)
{
TRACE(("In parent shell: child = %d\n", pid));
if (!jp) {
while (jobless && dowait(DOWAIT_NORMAL, 0) > 0);
jobless++;
return;
}
#if JOBS
if (mode != FORK_NOJOB && jp->jobctl) {
int pgrp;
if (jp->nprocs == 0)
pgrp = pid;
else
pgrp = jp->ps[0].pid;
/* This can fail because we are doing it in the child also */
(void)setpgid(pid, pgrp);
}
#endif
if (mode == FORK_BG) {
backgndpid = pid; /* set $! */
set_curjob(jp, CUR_RUNNING);
}
if (jp) {
struct procstat *ps = &jp->ps[jp->nprocs++];
ps->pid = pid;
ps->status = -1;
ps->cmd = nullstr;
#if JOBS
if (jobctl && n)
ps->cmd = commandtext(n);
#endif
}
}
static int
forkshell(struct job *jp, union node *n, int mode)
{
int pid;
TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
pid = fork();
if (pid < 0) {
TRACE(("Fork failed, errno=%d", errno));
if (jp)
freejob(jp);
error("Cannot fork");
}
if (pid == 0)
forkchild(jp, n, mode);
else
forkparent(jp, n, mode, pid);
return pid;
}
/*
* Wait for job to finish.
*
* Under job control we have the problem that while a child process is
* running interrupts generated by the user are sent to the child but not
* to the shell. This means that an infinite loop started by an inter-
* active user may be hard to kill. With job control turned off, an
* interactive user may place an interactive program inside a loop. If
* the interactive program catches interrupts, the user doesn't want
* these interrupts to also abort the loop. The approach we take here
* is to have the shell ignore interrupt signals while waiting for a
* forground process to terminate, and then send itself an interrupt
* signal if the child process was terminated by an interrupt signal.
* Unfortunately, some programs want to do a bit of cleanup and then
* exit on interrupt; unless these processes terminate themselves by
* sending a signal to themselves (instead of calling exit) they will
* confuse this approach.
*
* Called with interrupts off.
*/
int
waitforjob(struct job *jp)
{
int st;
TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
while (jp->state == JOBRUNNING) {
dowait(DOWAIT_BLOCK, jp);
}
st = getstatus(jp);
#if JOBS
if (jp->jobctl) {
xtcsetpgrp(ttyfd, rootpid);
/*
* This is truly gross.
* If we're doing job control, then we did a TIOCSPGRP which
* caused us (the shell) to no longer be in the controlling
* session -- so we wouldn't have seen any ^C/SIGINT. So, we
* intuit from the subprocess exit status whether a SIGINT
* occurred, and if so interrupt ourselves. Yuck. - mycroft
*/
if (jp->sigint)
raise(SIGINT);
}
if (jp->state == JOBDONE)
#endif
freejob(jp);
return st;
}
/*
* Do a wait system call. If job control is compiled in, we accept
* stopped processes. If block is zero, we return a value of zero
* rather than blocking.
*
* System V doesn't have a non-blocking wait system call. It does
* have a SIGCLD signal that is sent to a process when one of it's
* children dies. The obvious way to use SIGCLD would be to install
* a handler for SIGCLD which simply bumped a counter when a SIGCLD
* was received, and have waitproc bump another counter when it got
* the status of a process. Waitproc would then know that a wait
* system call would not block if the two counters were different.
* This approach doesn't work because if a process has children that
* have not been waited for, System V will send it a SIGCLD when it
* installs a signal handler for SIGCLD. What this means is that when
* a child exits, the shell will be sent SIGCLD signals continuously
* until is runs out of stack space, unless it does a wait call before
* restoring the signal handler. The code below takes advantage of
* this (mis)feature by installing a signal handler for SIGCLD and
* then checking to see whether it was called. If there are any
* children to be waited for, it will be.
*
* If neither SYSV nor BSD is defined, we don't implement nonblocking
* waits at all. In this case, the user will not be informed when
* a background process until the next time she runs a real program
* (as opposed to running a builtin command or just typing return),
* and the jobs command may give out of date information.
*/
static inline int
waitproc(int block, int *status)
{
int flags = 0;
#if JOBS
if (jobctl)
flags |= WUNTRACED;
#endif
if (block == 0)
flags |= WNOHANG;
return wait3(status, flags, (struct rusage *)NULL);
}
/*
* Wait for a process to terminate.
*/
static int
dowait(int block, struct job *job)
{
int pid;
int status;
struct job *jp;
struct job *thisjob;
int state;
TRACE(("dowait(%d) called\n", block));
pid = waitproc(block, &status);
TRACE(("wait returns pid %d, status=%d\n", pid, status));
if (pid <= 0)
return pid;
INTOFF;
thisjob = NULL;
for (jp = curjob; jp; jp = jp->prev_job) {
struct procstat *sp;
struct procstat *spend;
if (jp->state == JOBDONE)
continue;
state = JOBDONE;
spend = jp->ps + jp->nprocs;
sp = jp->ps;
do {
if (sp->pid == pid) {
TRACE(("Job %d: changing status of proc %d from 0x%x to 0x%x\n", jobno(jp), pid, sp->status, status));
sp->status = status;
thisjob = jp;
}
if (sp->status == -1)
state = JOBRUNNING;
#ifdef JOBS
if (state == JOBRUNNING)
continue;
if (WIFSTOPPED(sp->status)) {
jp->stopstatus = sp->status;
state = JOBSTOPPED;
}
#endif
} while (++sp < spend);
if (thisjob)
goto gotjob;
}
#ifdef JOBS
if (!WIFSTOPPED(status))
#endif
jobless--;
goto out;
gotjob:
if (state != JOBRUNNING) {
thisjob->changed = 1;
if (thisjob->state != state) {
TRACE(("Job %d: changing state from %d to %d\n", jobno(thisjob), thisjob->state, state));
thisjob->state = state;
#ifdef JOBS
if (state == JOBSTOPPED) {
set_curjob(thisjob, CUR_STOPPED);
}
#endif
}
}
out:
INTON;
if (thisjob && thisjob == job) {
char s[48 + 1];
int len;
len = sprint_status(s, status, 1);
if (len) {
s[len] = '\n';
s[len + 1] = 0;
out2str(s);
}
}
return pid;
}
/*
* return 1 if there are stopped jobs, otherwise 0
*/
int
stoppedjobs(void)
{
struct job *jp;
int retval;
retval = 0;
if (job_warning)
goto out;
jp = curjob;
if (jp && jp->state == JOBSTOPPED) {
out2str("You have stopped jobs.\n");
job_warning = 2;
retval++;
}
out:
return retval;
}
/*
* Return a string identifying a command (to be printed by the
* jobs command).
*/
#if JOBS
static char *cmdnextc;
static char *
commandtext(union node *n)
{
char *name;
STARTSTACKSTR(cmdnextc);
cmdtxt(n);
name = stackblock();
TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
name, cmdnextc, cmdnextc));
return savestr(name);
}
static void
cmdtxt(union node *n)
{
union node *np;
struct nodelist *lp;
const char *p;
char s[2];
switch (n->type) {
default:
#if DEBUG
abort();
#endif
case NPIPE:
lp = n->npipe.cmdlist;
for (;;) {
cmdtxt(lp->n);
lp = lp->next;
if (!lp)
break;
cmdputs(" | ");
}
break;
case NSEMI:
p = "; ";
goto binop;
case NAND:
p = " && ";
goto binop;
case NOR:
p = " || ";
binop:
cmdtxt(n->nbinary.ch1);
cmdputs(p);
n = n->nbinary.ch2;
goto donode;
case NREDIR:
case NBACKGND:
n = n->nredir.n;
goto donode;
case NNOT:
cmdputs("!");
n = n->nnot.com;
donode:
cmdtxt(n);
break;
case NIF:
cmdputs("if ");
cmdtxt(n->nif.test);
cmdputs("; then ");
n = n->nif.ifpart;
if (n->nif.elsepart) {
cmdtxt(n);
cmdputs("; else ");
n = n->nif.elsepart;
}
p = "; fi";
goto dotail;
case NSUBSHELL:
cmdputs("(");
n = n->nredir.n;
p = ")";
goto dotail;
case NWHILE:
p = "while ";
goto until;
case NUNTIL:
p = "until ";
until:
cmdputs(p);
cmdtxt(n->nbinary.ch1);
n = n->nbinary.ch2;
p = "; done";
dodo:
cmdputs("; do ");
dotail:
cmdtxt(n);
goto dotail2;
case NFOR:
cmdputs("for ");
cmdputs(n->nfor.var);
cmdputs(" in ");
cmdlist(n->nfor.args, 1);
n = n->nfor.body;
p = "; done";
goto dodo;
case NDEFUN:
cmdputs(n->narg.text);
p = "() { ... }";
goto dotail2;
case NCMD:
cmdlist(n->ncmd.args, 1);
cmdlist(n->ncmd.redirect, 0);
break;
case NARG:
p = n->narg.text;
dotail2:
cmdputs(p);
break;
case NHERE:
case NXHERE:
p = "<<...";
goto dotail2;
case NCASE:
cmdputs("case ");
cmdputs(n->ncase.expr->narg.text);
cmdputs(" in ");
for (np = n->ncase.cases; np; np = np->nclist.next) {
cmdtxt(np->nclist.pattern);
cmdputs(") ");
cmdtxt(np->nclist.body);
cmdputs(";; ");
}
p = "esac";
goto dotail2;
case NTO:
p = ">";
goto redir;
case NCLOBBER:
p = ">|";
goto redir;
case NAPPEND:
p = ">>";
goto redir;
case NTOFD:
p = ">&";
goto redir;
case NFROM:
p = "<";
goto redir;
case NFROMFD:
p = "<&";
goto redir;
case NFROMTO:
p = "<>";
redir:
s[0] = n->nfile.fd + '0';
s[1] = '\0';
cmdputs(s);
cmdputs(p);
if (n->type == NTOFD || n->type == NFROMFD) {
s[0] = n->ndup.dupfd + '0';
p = s;
goto dotail2;
} else {
n = n->nfile.fname;
goto donode;
}
}
}
static void
cmdlist(union node *np, int sep)
{
for (; np; np = np->narg.next) {
if (!sep)
cmdputs(spcstr);
cmdtxt(np);
if (sep && np->narg.next)
cmdputs(spcstr);
}
}
static void
cmdputs(const char *s)
{
const char *p, *str;
char c, cc[2] = " ";
char *nextc;
int subtype = 0;
int quoted = 0;
static const char *const vstype[16] = {
nullstr, "}", "-", "+", "?", "=",
"#", "##", "%", "%%"
};
nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
p = s;
while ((c = *p++) != 0) {
str = 0;
switch (c) {
case CTLESC:
c = *p++;
break;
case CTLVAR:
subtype = *p++;
if ((subtype & VSTYPE) == VSLENGTH)
str = "${#";
else
str = "${";
if (!(subtype & VSQUOTE) != !(quoted & 1)) {
quoted ^= 1;
c = '"';
} else
goto dostr;
break;
case CTLENDVAR:
quoted >>= 1;
subtype = 0;
if (quoted & 1) {
str = "\"}";
goto dostr;
}
c = '}';
break;
case CTLBACKQ:
str = "$(...)";
goto dostr;
case CTLBACKQ+CTLQUOTE:
str = "\"$(...)\"";
goto dostr;
#ifdef CONFIG_ASH_MATH_SUPPORT
case CTLARI:
str = "$((";
goto dostr;
case CTLENDARI:
str = "))";
goto dostr;
#endif
case CTLQUOTEMARK:
quoted ^= 1;
c = '"';
break;
case '=':
if (subtype == 0)
break;
str = vstype[subtype & VSTYPE];
if (subtype & VSNUL)
c = ':';
else
c = *str++;
if (c != '}')
quoted <<= 1;
break;
case '\'':
case '\\':
case '"':
case '$':
/* These can only happen inside quotes */
cc[0] = c;
str = cc;
c = '\\';
break;
default:
break;
}
USTPUTC(c, nextc);
if (!str)
continue;
dostr:
while ((c = *str++)) {
USTPUTC(c, nextc);
}
}
if (quoted & 1) {
USTPUTC('"', nextc);
}
*nextc = 0;
cmdnextc = nextc;
}
static void
showpipe(struct job *jp, FILE *out)
{
struct procstat *sp;
struct procstat *spend;
spend = jp->ps + jp->nprocs;
for (sp = jp->ps + 1; sp < spend; sp++)
fprintf(out, " | %s", sp->cmd);
outcslow('\n', out);
flushall();
}
static void
xtcsetpgrp(int fd, pid_t pgrp)
{
if (tcsetpgrp(fd, pgrp))
error("Cannot set tty process group (%m)");
}
#endif /* JOBS */
static int
getstatus(struct job *job) {
int status;
int retval;
status = job->ps[job->nprocs - 1].status;
retval = WEXITSTATUS(status);
if (!WIFEXITED(status)) {
#if JOBS
retval = WSTOPSIG(status);
if (!WIFSTOPPED(status))
#endif
{
/* XXX: limits number of signals */
retval = WTERMSIG(status);
#if JOBS
if (retval == SIGINT)
job->sigint = 1;
#endif
}
retval += 128;
}
TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n",
jobno(job), job->nprocs, status, retval));
return retval;
}
#ifdef CONFIG_ASH_MAIL
/* $NetBSD: mail.c,v 1.15 2002/11/24 22:35:40 christos Exp $ */
/*
* Routines to check for mail. (Perhaps make part of main.c?)
*/
#define MAXMBOXES 10
/* times of mailboxes */
static time_t mailtime[MAXMBOXES];
/* Set if MAIL or MAILPATH is changed. */
static int mail_var_path_changed;
/*
* Print appropriate message(s) if mail has arrived.
* If mail_var_path_changed is set,
* then the value of MAIL has mail_var_path_changed,
* so we just update the values.
*/
static void
chkmail(void)
{
const char *mpath;
char *p;
char *q;
time_t *mtp;
struct stackmark smark;
struct stat statb;
setstackmark(&smark);
mpath = mpathset() ? mpathval() : mailval();
for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
p = padvance(&mpath, nullstr);
if (p == NULL)
break;
if (*p == '\0')
continue;
for (q = p ; *q ; q++);
#ifdef DEBUG
if (q[-1] != '/')
abort();
#endif
q[-1] = '\0'; /* delete trailing '/' */
if (stat(p, &statb) < 0) {
*mtp = 0;
continue;
}
if (!mail_var_path_changed && statb.st_mtime != *mtp) {
fprintf(
stderr, snlfmt,
pathopt ? pathopt : "you have mail"
);
}
*mtp = statb.st_mtime;
}
mail_var_path_changed = 0;
popstackmark(&smark);
}
static void
changemail(const char *val)
{
mail_var_path_changed++;
}
#endif /* CONFIG_ASH_MAIL */
/* $NetBSD: main.c,v 1.46 2002/12/11 19:12:18 christos Exp $ */
#if PROFILE
static short profile_buf[16384];
extern int etext();
#endif
static int isloginsh;
static void read_profile(const char *);
/*
* Main routine. We initialize things, parse the arguments, execute
* profiles if we're a login shell, and then call cmdloop to execute
* commands. The setjmp call sets up the location to jump to when an
* exception occurs. When an exception occurs the variable "state"
* is used to figure out how far we had gotten.
*/
int
ash_main(int argc, char **argv)
{
char *shinit;
volatile int state;
struct jmploc jmploc;
struct stackmark smark;
#ifdef __GLIBC__
dash_errno = __errno_location();
#endif
#if PROFILE
monitor(4, etext, profile_buf, sizeof profile_buf, 50);
#endif
state = 0;
if (setjmp(jmploc.loc)) {
int status;
int e;
reset();
e = exception;
switch (exception) {
case EXEXEC:
status = exerrno;
break;
case EXERROR:
status = 2;
break;
default:
status = exitstatus;
break;
}
exitstatus = status;
if (e == EXEXIT || state == 0 || iflag == 0 || ! rootshell)
exitshell();
if (e == EXINT ) {
outcslow('\n', stderr);
}
popstackmark(&smark);
FORCEINTON; /* enable interrupts */
if (state == 1)
goto state1;
else if (state == 2)
goto state2;
else if (state == 3)
goto state3;
else
goto state4;
}
handler = &jmploc;
#ifdef DEBUG
opentrace();
trputs("Shell args: "); trargs(argv);
#endif
rootpid = getpid();
rootshell = 1;
init();
setstackmark(&smark);
procargs(argc, argv);
#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
if ( iflag ) {
const char *hp = lookupvar("HISTFILE");
if(hp == NULL ) {
hp = lookupvar("HOME");
if(hp != NULL) {
char *defhp = concat_path_file(hp, ".ash_history");
setvar("HISTFILE", defhp, 0);
free(defhp);
}
}
}
#endif
if (argv[0] && argv[0][0] == '-')
isloginsh = 1;
if (isloginsh) {
state = 1;
read_profile("/etc/profile");
state1:
state = 2;
read_profile(".profile");
}
state2:
state = 3;
if (
#ifndef linux
getuid() == geteuid() && getgid() == getegid() &&
#endif
iflag
) {
if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
read_profile(shinit);
}
}
state3:
state = 4;
if (minusc)
evalstring(minusc, 0);
if (sflag || minusc == NULL) {
state4: /* XXX ??? - why isn't this before the "if" statement */
#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
if ( iflag ) {
const char *hp = lookupvar("HISTFILE");
if(hp != NULL )
load_history ( hp );
}
#endif
cmdloop(1);
}
#if PROFILE
monitor(0);
#endif
#if GPROF
{
extern void _mcleanup(void);
_mcleanup();
}
#endif
exitshell();
/* NOTREACHED */
}
/*
* Read and execute commands. "Top" is nonzero for the top level command
* loop; it turns on prompting if the shell is interactive.
*/
static void
cmdloop(int top)
{
union node *n;
struct stackmark smark;
int inter;
int numeof = 0;
TRACE(("cmdloop(%d) called\n", top));
setstackmark(&smark);
for (;;) {
if (pendingsigs)
dotrap();
#if JOBS
if (jobctl)
showjobs(stderr, SHOW_CHANGED);
#endif
inter = 0;
if (iflag && top) {
inter++;
#ifdef CONFIG_ASH_MAIL
chkmail();
#endif
}
n = parsecmd(inter);
/* showtree(n); DEBUG */
if (n == NEOF) {
if (!top || numeof >= 50)
break;
if (!stoppedjobs()) {
if (!Iflag)
break;
out2str("\nUse \"exit\" to leave shell.\n");
}
numeof++;
} else if (n != NULL && nflag == 0) {
job_warning = (job_warning == 2) ? 1 : 0;
numeof = 0;
evaltree(n, 0);
}
popstackmark(&smark);
setstackmark(&smark);
if (evalskip == SKIPFILE) {
evalskip = 0;
break;
}
}
popstackmark(&smark);
}
/*
* Read /etc/profile or .profile. Return on error.
*/
static void
read_profile(const char *name)
{
int fd;
int xflag_set = 0;
int vflag_set = 0;
INTOFF;
if ((fd = open(name, O_RDONLY)) >= 0)
setinputfd(fd, 1);
INTON;
if (fd < 0)
return;
/* -q turns off -x and -v just when executing init files */
if (qflag) {
if (xflag)
xflag = 0, xflag_set = 1;
if (vflag)
vflag = 0, vflag_set = 1;
}
cmdloop(0);
if (qflag) {
if (xflag_set)
xflag = 1;
if (vflag_set)
vflag = 1;
}
popfile();
}
/*
* Read a file containing shell functions.
*/
static void
readcmdfile(char *name)
{
int fd;
INTOFF;
if ((fd = open(name, O_RDONLY)) >= 0)
setinputfd(fd, 1);
else
error("Can't open %s", name);
INTON;
cmdloop(0);
popfile();
}
/*
* Take commands from a file. To be compatible we should do a path
* search for the file, which is necessary to find sub-commands.
*/
static inline char *
find_dot_file(char *name)
{
char *fullname;
const char *path = pathval();
struct stat statb;
/* don't try this for absolute or relative paths */
if (strchr(name, '/'))
return name;
while ((fullname = padvance(&path, name)) != NULL) {
if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
/*
* Don't bother freeing here, since it will
* be freed by the caller.
*/
return fullname;
}
stunalloc(fullname);
}
/* not found in the PATH */
error(not_found_msg, name);
/* NOTREACHED */
}
int
dotcmd(int argc, char **argv)
{
exitstatus = 0;
if (argc >= 2) { /* That's what SVR2 does */
char *fullname;
struct stackmark smark;
setstackmark(&smark);
fullname = find_dot_file(argv[1]);
setinputfile(fullname, 1);
commandname = fullname;
cmdloop(0);
popfile();
popstackmark(&smark);
}
return exitstatus;
}
static int
exitcmd(int argc, char **argv)
{
if (stoppedjobs())
return 0;
if (argc > 1)
exitstatus = number(argv[1]);
exraise(EXEXIT);
/* NOTREACHED */
}
/* $NetBSD: memalloc.c,v 1.27 2003/01/22 20:36:04 dsl Exp $ */
/*
* Like malloc, but returns an error when out of space.
*/
static pointer
ckmalloc(size_t nbytes)
{
pointer p;
p = malloc(nbytes);
if (p == NULL)
error(bb_msg_memory_exhausted);
return p;
}
/*
* Same for realloc.
*/
static pointer
ckrealloc(pointer p, size_t nbytes)
{
p = realloc(p, nbytes);
if (p == NULL)
error(bb_msg_memory_exhausted);
return p;
}
/*
* Make a copy of a string in safe storage.
*/
static char *
savestr(const char *s)
{
char *p = strdup(s);
if (!p)
error(bb_msg_memory_exhausted);
return p;
}
/*
* Parse trees for commands are allocated in lifo order, so we use a stack
* to make this more efficient, and also to avoid all sorts of exception
* handling code to handle interrupts in the middle of a parse.
*
* The size 504 was chosen because the Ultrix malloc handles that size
* well.
*/
static pointer
stalloc(size_t nbytes)
{
char *p;
size_t aligned;
aligned = SHELL_ALIGN(nbytes);
if (aligned > stacknleft) {
size_t len;
size_t blocksize;
struct stack_block *sp;
blocksize = aligned;
if (blocksize < MINSIZE)
blocksize = MINSIZE;
len = sizeof(struct stack_block) - MINSIZE + blocksize;
if (len < blocksize)
error(bb_msg_memory_exhausted);
INTOFF;
sp = ckmalloc(len);
sp->prev = stackp;
stacknxt = sp->space;
stacknleft = blocksize;
sstrend = stacknxt + blocksize;
stackp = sp;
INTON;
}
p = stacknxt;
stacknxt += aligned;
stacknleft -= aligned;
return p;
}
void
stunalloc(pointer p)
{
#ifdef DEBUG
if (!p || (stacknxt < (char *)p) || ((char *)p < stackp->space)) {
write(2, "stunalloc\n", 10);
abort();
}
#endif
stacknleft += stacknxt - (char *)p;
stacknxt = p;
}
void
setstackmark(struct stackmark *mark)
{
mark->stackp = stackp;
mark->stacknxt = stacknxt;
mark->stacknleft = stacknleft;
mark->marknext = markp;
markp = mark;
}
void
popstackmark(struct stackmark *mark)
{
struct stack_block *sp;
INTOFF;
markp = mark->marknext;
while (stackp != mark->stackp) {
sp = stackp;
stackp = sp->prev;
ckfree(sp);
}
stacknxt = mark->stacknxt;
stacknleft = mark->stacknleft;
sstrend = mark->stacknxt + mark->stacknleft;
INTON;
}
/*
* When the parser reads in a string, it wants to stick the string on the
* stack and only adjust the stack pointer when it knows how big the
* string is. Stackblock (defined in stack.h) returns a pointer to a block
* of space on top of the stack and stackblocklen returns the length of
* this block. Growstackblock will grow this space by at least one byte,
* possibly moving it (like realloc). Grabstackblock actually allocates the
* part of the block that has been used.
*/
void
growstackblock(void)
{
size_t newlen;
newlen = stacknleft * 2;
if (newlen < stacknleft)
error(bb_msg_memory_exhausted);
if (newlen < 128)
newlen += 128;
if (stacknxt == stackp->space && stackp != &stackbase) {
struct stack_block *oldstackp;
struct stackmark *xmark;
struct stack_block *sp;
struct stack_block *prevstackp;
size_t grosslen;
INTOFF;
oldstackp = stackp;
sp = stackp;
prevstackp = sp->prev;
grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
sp = ckrealloc((pointer)sp, grosslen);
sp->prev = prevstackp;
stackp = sp;
stacknxt = sp->space;
stacknleft = newlen;
sstrend = sp->space + newlen;
/*
* Stack marks pointing to the start of the old block
* must be relocated to point to the new block
*/
xmark = markp;
while (xmark != NULL && xmark->stackp == oldstackp) {
xmark->stackp = stackp;
xmark->stacknxt = stacknxt;
xmark->stacknleft = stacknleft;
xmark = xmark->marknext;
}
INTON;
} else {
char *oldspace = stacknxt;
int oldlen = stacknleft;
char *p = stalloc(newlen);
/* free the space we just allocated */
stacknxt = memcpy(p, oldspace, oldlen);
stacknleft += newlen;
}
}
static inline void
grabstackblock(size_t len)
{
len = SHELL_ALIGN(len);
stacknxt += len;
stacknleft -= len;
}
/*
* The following routines are somewhat easier to use than the above.
* The user declares a variable of type STACKSTR, which may be declared
* to be a register. The macro STARTSTACKSTR initializes things. Then
* the user uses the macro STPUTC to add characters to the string. In
* effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
* grown as necessary. When the user is done, she can just leave the
* string there and refer to it using stackblock(). Or she can allocate
* the space for it using grabstackstr(). If it is necessary to allow
* someone else to use the stack temporarily and then continue to grow
* the string, the user should use grabstack to allocate the space, and
* then call ungrabstr(p) to return to the previous mode of operation.
*
* USTPUTC is like STPUTC except that it doesn't check for overflow.
* CHECKSTACKSPACE can be called before USTPUTC to ensure that there
* is space for at least one character.
*/
void *
growstackstr(void)
{
size_t len = stackblocksize();
if (herefd >= 0 && len >= 1024) {
xwrite(herefd, stackblock(), len);
return stackblock();
}
growstackblock();
return stackblock() + len;
}
/*
* Called from CHECKSTRSPACE.
*/
char *
makestrspace(size_t newlen, char *p)
{
size_t len = p - stacknxt;
size_t size = stackblocksize();
for (;;) {
size_t nleft;
size = stackblocksize();
nleft = size - len;
if (nleft >= newlen)
break;
growstackblock();
}
return stackblock() + len;
}
char *
stnputs(const char *s, size_t n, char *p)
{
p = makestrspace(n, p);
p = mempcpy(p, s, n);
return p;
}
char *
stputs(const char *s, char *p)
{
return stnputs(s, strlen(s), p);
}
/* $NetBSD: mystring.c,v 1.15 2002/11/24 22:35:42 christos Exp $ */
/*
* String functions.
*
* number(s) Convert a string of digits to an integer.
* is_number(s) Return true if s is a string of digits.
*/
/*
* prefix -- see if pfx is a prefix of string.
*/
char *
prefix(const char *string, const char *pfx)
{
while (*pfx) {
if (*pfx++ != *string++)
return 0;
}
return (char *) string;
}
/*
* Convert a string of digits to an integer, printing an error message on
* failure.
*/
int
number(const char *s)
{
if (! is_number(s))
error(illnum, s);
return atoi(s);
}
/*
* Check for a valid number. This should be elsewhere.
*/
int
is_number(const char *p)
{
do {
if (! is_digit(*p))
return 0;
} while (*++p != '\0');
return 1;
}
/*
* Produce a possibly single quoted string suitable as input to the shell.
* The return string is allocated on the stack.
*/
char *
single_quote(const char *s) {
char *p;
STARTSTACKSTR(p);
do {
char *q;
size_t len;
len = strchrnul(s, '\'') - s;
q = p = makestrspace(len + 3, p);
*q++ = '\'';
q = mempcpy(q, s, len);
*q++ = '\'';
s += len;
STADJUST(q - p, p);
len = strspn(s, "'");
if (!len)
break;
q = p = makestrspace(len + 3, p);
*q++ = '"';
q = mempcpy(q, s, len);
*q++ = '"';
s += len;
STADJUST(q - p, p);
} while (*s);
USTPUTC(0, p);
return stackblock();
}
/*
* Like strdup but works with the ash stack.
*/
char *
sstrdup(const char *p)
{
size_t len = strlen(p) + 1;
return memcpy(stalloc(len), p, len);
}
static void
calcsize(union node *n)
{
if (n == NULL)
return;
funcblocksize += nodesize[n->type];
switch (n->type) {
case NCMD:
calcsize(n->ncmd.redirect);
calcsize(n->ncmd.args);
calcsize(n->ncmd.assign);
break;
case NPIPE:
sizenodelist(n->npipe.cmdlist);
break;
case NREDIR:
case NBACKGND:
case NSUBSHELL:
calcsize(n->nredir.redirect);
calcsize(n->nredir.n);
break;
case NAND:
case NOR:
case NSEMI:
case NWHILE:
case NUNTIL:
calcsize(n->nbinary.ch2);
calcsize(n->nbinary.ch1);
break;
case NIF:
calcsize(n->nif.elsepart);
calcsize(n->nif.ifpart);
calcsize(n->nif.test);
break;
case NFOR:
funcstringsize += strlen(n->nfor.var) + 1;
calcsize(n->nfor.body);
calcsize(n->nfor.args);
break;
case NCASE:
calcsize(n->ncase.cases);
calcsize(n->ncase.expr);
break;
case NCLIST:
calcsize(n->nclist.body);
calcsize(n->nclist.pattern);
calcsize(n->nclist.next);
break;
case NDEFUN:
case NARG:
sizenodelist(n->narg.backquote);
funcstringsize += strlen(n->narg.text) + 1;
calcsize(n->narg.next);
break;
case NTO:
case NCLOBBER:
case NFROM:
case NFROMTO:
case NAPPEND:
calcsize(n->nfile.fname);
calcsize(n->nfile.next);
break;
case NTOFD:
case NFROMFD:
calcsize(n->ndup.vname);
calcsize(n->ndup.next);
break;
case NHERE:
case NXHERE:
calcsize(n->nhere.doc);
calcsize(n->nhere.next);
break;
case NNOT:
calcsize(n->nnot.com);
break;
};
}
static void
sizenodelist(struct nodelist *lp)
{
while (lp) {
funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
calcsize(lp->n);
lp = lp->next;
}
}
static union node *
copynode(union node *n)
{
union node *new;
if (n == NULL)
return NULL;
new = funcblock;
funcblock = (char *) funcblock + nodesize[n->type];
switch (n->type) {
case NCMD:
new->ncmd.redirect = copynode(n->ncmd.redirect);
new->ncmd.args = copynode(n->ncmd.args);
new->ncmd.assign = copynode(n->ncmd.assign);
break;
case NPIPE:
new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
new->npipe.backgnd = n->npipe.backgnd;
break;
case NREDIR:
case NBACKGND:
case NSUBSHELL:
new->nredir.redirect = copynode(n->nredir.redirect);
new->nredir.n = copynode(n->nredir.n);
break;
case NAND:
case NOR:
case NSEMI:
case NWHILE:
case NUNTIL:
new->nbinary.ch2 = copynode(n->nbinary.ch2);
new->nbinary.ch1 = copynode(n->nbinary.ch1);
break;
case NIF:
new->nif.elsepart = copynode(n->nif.elsepart);
new->nif.ifpart = copynode(n->nif.ifpart);
new->nif.test = copynode(n->nif.test);
break;
case NFOR:
new->nfor.var = nodesavestr(n->nfor.var);
new->nfor.body = copynode(n->nfor.body);
new->nfor.args = copynode(n->nfor.args);
break;
case NCASE:
new->ncase.cases = copynode(n->ncase.cases);
new->ncase.expr = copynode(n->ncase.expr);
break;
case NCLIST:
new->nclist.body = copynode(n->nclist.body);
new->nclist.pattern = copynode(n->nclist.pattern);
new->nclist.next = copynode(n->nclist.next);
break;
case NDEFUN:
case NARG:
new->narg.backquote = copynodelist(n->narg.backquote);
new->narg.text = nodesavestr(n->narg.text);
new->narg.next = copynode(n->narg.next);
break;
case NTO:
case NCLOBBER:
case NFROM:
case NFROMTO:
case NAPPEND:
new->nfile.fname = copynode(n->nfile.fname);
new->nfile.fd = n->nfile.fd;
new->nfile.next = copynode(n->nfile.next);
break;
case NTOFD:
case NFROMFD:
new->ndup.vname = copynode(n->ndup.vname);
new->ndup.dupfd = n->ndup.dupfd;
new->ndup.fd = n->ndup.fd;
new->ndup.next = copynode(n->ndup.next);
break;
case NHERE:
case NXHERE:
new->nhere.doc = copynode(n->nhere.doc);
new->nhere.fd = n->nhere.fd;
new->nhere.next = copynode(n->nhere.next);
break;
case NNOT:
new->nnot.com = copynode(n->nnot.com);
break;
};
new->type = n->type;
return new;
}
static struct nodelist *
copynodelist(struct nodelist *lp)
{
struct nodelist *start;
struct nodelist **lpp;
lpp = &start;
while (lp) {
*lpp = funcblock;
funcblock = (char *) funcblock +
SHELL_ALIGN(sizeof(struct nodelist));
(*lpp)->n = copynode(lp->n);
lp = lp->next;
lpp = &(*lpp)->next;
}
*lpp = NULL;
return start;
}
static char *
nodesavestr(char *s)
{
char *rtn = funcstring;
funcstring = stpcpy(funcstring, s) + 1;
return rtn;
}
/*
* Free a parse tree.
*/
static void
freefunc(struct funcnode *f)
{
if (f && --f->count < 0)
ckfree(f);
}
static void options(int);
static void setoption(int, int);
/*
* Process the shell command line arguments.
*/
void
procargs(int argc, char **argv)
{
int i;
const char *xminusc;
char **xargv;
xargv = argv;
arg0 = xargv[0];
if (argc > 0)
xargv++;
for (i = 0; i < NOPTS; i++)
optlist[i] = 2;
argptr = xargv;
options(1);
xargv = argptr;
xminusc = minusc;
if (*xargv == NULL) {
if (xminusc)
error("-c requires an argument");
sflag = 1;
}
if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
iflag = 1;
if (mflag == 2)
mflag = iflag;
for (i = 0; i < NOPTS; i++)
if (optlist[i] == 2)
optlist[i] = 0;
#if DEBUG == 2
debug = 1;
#endif
/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
if (xminusc) {
minusc = *xargv++;
if (*xargv)
goto setarg0;
} else if (!sflag) {
setinputfile(*xargv, 0);
setarg0:
arg0 = *xargv++;
commandname = arg0;
}
shellparam.p = xargv;
#ifdef CONFIG_ASH_GETOPTS
shellparam.optind = 1;
shellparam.optoff = -1;
#endif
/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
while (*xargv) {
shellparam.nparam++;
xargv++;
}
optschanged();
}
void
optschanged(void)
{
#ifdef DEBUG
opentrace();
#endif
setinteractive(iflag);
setjobctl(mflag);
}
static inline void
minus_o(char *name, int val)
{
int i;
if (name == NULL) {
out1str("Current option settings\n");
for (i = 0; i < NOPTS; i++)
out1fmt("%-16s%s\n", optnames(i),
optlist[i] ? "on" : "off");
} else {
for (i = 0; i < NOPTS; i++)
if (equal(name, optnames(i))) {
optlist[i] = val;
return;
}
error("Illegal option -o %s", name);
}
}
/*
* Process shell options. The global variable argptr contains a pointer
* to the argument list; we advance it past the options.
*/
static void
options(int cmdline)
{
char *p;
int val;
int c;
if (cmdline)
minusc = NULL;
while ((p = *argptr) != NULL) {
argptr++;
if ((c = *p++) == '-') {
val = 1;
if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
if (!cmdline) {
/* "-" means turn off -x and -v */
if (p[0] == '\0')
xflag = vflag = 0;
/* "--" means reset params */
else if (*argptr == NULL)
setparam(argptr);
}
break; /* "-" or "--" terminates options */
}
} else if (c == '+') {
val = 0;
} else {
argptr--;
break;
}
while ((c = *p++) != '\0') {
if (c == 'c' && cmdline) {
minusc = p; /* command is after shell args*/
} else if (c == 'o') {
minus_o(*argptr, val);
if (*argptr)
argptr++;
} else if (cmdline && (c == '-')) { // long options
if (strcmp(p, "login") == 0)
isloginsh = 1;
break;
} else {
setoption(c, val);
}
}
}
}
static void
setoption(int flag, int val)
{
int i;
for (i = 0; i < NOPTS; i++)
if (optletters(i) == flag) {
optlist[i] = val;
return;
}
error("Illegal option -%c", flag);
/* NOTREACHED */
}
/*
* Set the shell parameters.
*/
void
setparam(char **argv)
{
char **newparam;
char **ap;
int nparam;
for (nparam = 0 ; argv[nparam] ; nparam++);
ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
while (*argv) {
*ap++ = savestr(*argv++);
}
*ap = NULL;
freeparam(&shellparam);
shellparam.malloc = 1;
shellparam.nparam = nparam;
shellparam.p = newparam;
#ifdef CONFIG_ASH_GETOPTS
shellparam.optind = 1;
shellparam.optoff = -1;
#endif
}
/*
* Free the list of positional parameters.
*/
void
freeparam(volatile struct shparam *param)
{
char **ap;
if (param->malloc) {
for (ap = param->p ; *ap ; ap++)
ckfree(*ap);
ckfree(param->p);
}
}
/*
* The shift builtin command.
*/
int
shiftcmd(int argc, char **argv)
{
int n;
char **ap1, **ap2;
n = 1;
if (argc > 1)
n = number(argv[1]);
if (n > shellparam.nparam)
error("can't shift that many");
INTOFF;
shellparam.nparam -= n;
for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
if (shellparam.malloc)
ckfree(*ap1);
}
ap2 = shellparam.p;
while ((*ap2++ = *ap1++) != NULL);
#ifdef CONFIG_ASH_GETOPTS
shellparam.optind = 1;
shellparam.optoff = -1;
#endif
INTON;
return 0;
}
/*
* The set command builtin.
*/
int
setcmd(int argc, char **argv)
{
if (argc == 1)
return showvars(nullstr, 0, VUNSET);
INTOFF;
options(0);
optschanged();
if (*argptr != NULL) {
setparam(argptr);
}
INTON;
return 0;
}
#ifdef CONFIG_ASH_GETOPTS
static void
getoptsreset(value)
const char *value;
{
shellparam.optind = number(value);
shellparam.optoff = -1;
}
#endif
#ifdef CONFIG_LOCALE_SUPPORT
static void change_lc_all(const char *value)
{
if (value != 0 && *value != 0)
setlocale(LC_ALL, value);
}
static void change_lc_ctype(const char *value)
{
if (value != 0 && *value != 0)
setlocale(LC_CTYPE, value);
}
#endif
#ifdef CONFIG_ASH_GETOPTS
static int
getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
{
char *p, *q;
char c = '?';
int done = 0;
int err = 0;
char s[10];
char **optnext = optfirst + *param_optind - 1;
if (*param_optind <= 1 || *optoff < 0 || !(*(optnext - 1)) ||
strlen(*(optnext - 1)) < *optoff)
p = NULL;
else
p = *(optnext - 1) + *optoff;
if (p == NULL || *p == '\0') {
/* Current word is done, advance */
if (optnext == NULL)
return 1;
p = *optnext;
if (p == NULL || *p != '-' || *++p == '\0') {
atend:
p = NULL;
done = 1;
goto out;
}
optnext++;
if (p[0] == '-' && p[1] == '\0') /* check for "--" */
goto atend;
}
c = *p++;
for (q = optstr; *q != c; ) {
if (*q == '\0') {
if (optstr[0] == ':') {
s[0] = c;
s[1] = '\0';
err |= setvarsafe("OPTARG", s, 0);
} else {
fprintf(stderr, "Illegal option -%c\n", c);
(void) unsetvar("OPTARG");
}
c = '?';
goto out;
}
if (*++q == ':')
q++;
}
if (*++q == ':') {
if (*p == '\0' && (p = *optnext) == NULL) {
if (optstr[0] == ':') {
s[0] = c;
s[1] = '\0';
err |= setvarsafe("OPTARG", s, 0);
c = ':';
} else {
fprintf(stderr, "No arg for -%c option\n", c);
(void) unsetvar("OPTARG");
c = '?';
}
goto out;
}
if (p == *optnext)
optnext++;
err |= setvarsafe("OPTARG", p, 0);
p = NULL;
} else
err |= setvarsafe("OPTARG", nullstr, 0);
out:
*optoff = p ? p - *(optnext - 1) : -1;
*param_optind = optnext - optfirst + 1;
fmtstr(s, sizeof(s), "%d", *param_optind);
err |= setvarsafe("OPTIND", s, VNOFUNC);
s[0] = c;
s[1] = '\0';
err |= setvarsafe(optvar, s, 0);
if (err) {
*param_optind = 1;
*optoff = -1;
flushall();
exraise(EXERROR);
}
return done;
}
/*
* The getopts builtin. Shellparam.optnext points to the next argument
* to be processed. Shellparam.optptr points to the next character to
* be processed in the current argument. If shellparam.optnext is NULL,
* then it's the first time getopts has been called.
*/
int
getoptscmd(int argc, char **argv)
{
char **optbase;
if (argc < 3)
error("Usage: getopts optstring var [arg]");
else if (argc == 3) {
optbase = shellparam.p;
if (shellparam.optind > shellparam.nparam + 1) {
shellparam.optind = 1;
shellparam.optoff = -1;
}
}
else {
optbase = &argv[3];
if (shellparam.optind > argc - 2) {
shellparam.optind = 1;
shellparam.optoff = -1;
}
}
return getopts(argv[1], argv[2], optbase, &shellparam.optind,
&shellparam.optoff);
}
#endif /* CONFIG_ASH_GETOPTS */
/*
* XXX - should get rid of. have all builtins use getopt(3). the
* library getopt must have the BSD extension static variable "optreset"
* otherwise it can't be used within the shell safely.
*
* Standard option processing (a la getopt) for builtin routines. The
* only argument that is passed to nextopt is the option string; the
* other arguments are unnecessary. It return the character, or '\0' on
* end of input.
*/
static int
nextopt(const char *optstring)
{
char *p;
const char *q;
char c;
if ((p = optptr) == NULL || *p == '\0') {
p = *argptr;
if (p == NULL || *p != '-' || *++p == '\0')
return '\0';
argptr++;
if (p[0] == '-' && p[1] == '\0') /* check for "--" */
return '\0';
}
c = *p++;
for (q = optstring ; *q != c ; ) {
if (*q == '\0')
error("Illegal option -%c", c);
if (*++q == ':')
q++;
}
if (*++q == ':') {
if (*p == '\0' && (p = *argptr++) == NULL)
error("No arg for -%c option", c);
optionarg = p;
p = NULL;
}
optptr = p;
return c;
}
/* $NetBSD: output.c,v 1.27 2002/11/24 22:35:42 christos Exp $ */
void
outstr(const char *p, FILE *file)
{
INTOFF;
fputs(p, file);
INTON;
}
void
flushall(void)
{
INTOFF;
fflush(stdout);
fflush(stderr);
INTON;
}
void
flushout(FILE *dest)
{
INTOFF;
fflush(dest);
INTON;
}
static void
outcslow(int c, FILE *dest)
{
INTOFF;
putc(c, dest);
fflush(dest);
INTON;
}
static int
out1fmt(const char *fmt, ...)
{
va_list ap;
int r;
INTOFF;
va_start(ap, fmt);
r = vprintf(fmt, ap);
va_end(ap);
INTON;
return r;
}
int
fmtstr(char *outbuf, size_t length, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
INTOFF;
ret = vsnprintf(outbuf, length, fmt, ap);
va_end(ap);
INTON;
return ret;
}
/*
* Version of write which resumes after a signal is caught.
*/
static void
xwrite(int fd, const void *p, size_t n)
{
ssize_t i;
do {
i = bb_full_write(fd, p, n);
} while (i < 0 && errno == EINTR);
}
/* $NetBSD: parser.c,v 1.54 2002/11/24 22:35:42 christos Exp $ */
/*
* Shell command parser.
*/
#define EOFMARKLEN 79
struct heredoc {
struct heredoc *next; /* next here document in list */
union node *here; /* redirection node */
char *eofmark; /* string indicating end of input */
int striptabs; /* if set, strip leading tabs */
};
static struct heredoc *heredoclist; /* list of here documents to read */
static union node *list(int);
static union node *andor(void);
static union node *pipeline(void);
static union node *command(void);
static union node *simplecmd(void);
static union node *makename(void);
static void parsefname(void);
static void parseheredoc(void);
static char peektoken(void);
static int readtoken(void);
static int xxreadtoken(void);
static int readtoken1(int firstc, int syntax, char *eofmark, int striptabs);
static int noexpand(char *);
static void synexpect(int) __attribute__((__noreturn__));
static void synerror(const char *) __attribute__((__noreturn__));
static void setprompt(int);
static inline int
goodname(const char *p)
{
return !*endofname(p);
}
static inline int
isassignment(const char *p)
{
const char *q = endofname(p);
if (p == q)
return 0;
return *q == '=';
}
/*
* Read and parse a command. Returns NEOF on end of file. (NULL is a
* valid parse tree indicating a blank line.)
*/
union node *
parsecmd(int interact)
{
int t;
tokpushback = 0;
doprompt = interact;
if (doprompt)
setprompt(doprompt);
needprompt = 0;
t = readtoken();
if (t == TEOF)
return NEOF;
if (t == TNL)
return NULL;
tokpushback++;
return list(1);
}
static union node *
list(int nlflag)
{
union node *n1, *n2, *n3;
int tok;
checkkwd = CHKNL | CHKKWD | CHKALIAS;
if (nlflag == 2 && peektoken())
return NULL;
n1 = NULL;
for (;;) {
n2 = andor();
tok = readtoken();
if (tok == TBACKGND) {
if (n2->type == NPIPE) {
n2->npipe.backgnd = 1;
} else {
if (n2->type != NREDIR) {
n3 = stalloc(sizeof(struct nredir));
n3->nredir.n = n2;
n3->nredir.redirect = NULL;
n2 = n3;
}
n2->type = NBACKGND;
}
}
if (n1 == NULL) {
n1 = n2;
}
else {
n3 = (union node *)stalloc(sizeof (struct nbinary));
n3->type = NSEMI;
n3->nbinary.ch1 = n1;
n3->nbinary.ch2 = n2;
n1 = n3;
}
switch (tok) {
case TBACKGND:
case TSEMI:
tok = readtoken();
/* fall through */
case TNL:
if (tok == TNL) {
parseheredoc();
if (nlflag == 1)
return n1;
} else {
tokpushback++;
}
checkkwd = CHKNL | CHKKWD | CHKALIAS;
if (peektoken())
return n1;
break;
case TEOF:
if (heredoclist)
parseheredoc();
else
pungetc(); /* push back EOF on input */
return n1;
default:
if (nlflag == 1)
synexpect(-1);
tokpushback++;
return n1;
}
}
}
static union node *
andor(void)
{
union node *n1, *n2, *n3;
int t;
n1 = pipeline();
for (;;) {
if ((t = readtoken()) == TAND) {
t = NAND;
} else if (t == TOR) {
t = NOR;
} else {
tokpushback++;
return n1;
}
checkkwd = CHKNL | CHKKWD | CHKALIAS;
n2 = pipeline();
n3 = (union node *)stalloc(sizeof (struct nbinary));
n3->type = t;
n3->nbinary.ch1 = n1;
n3->nbinary.ch2 = n2;
n1 = n3;
}
}
static union node *
pipeline(void)
{
union node *n1, *n2, *pipenode;
struct nodelist *lp, *prev;
int negate;
negate = 0;
TRACE(("pipeline: entered\n"));
if (readtoken() == TNOT) {
negate = !negate;
checkkwd = CHKKWD | CHKALIAS;
} else
tokpushback++;
n1 = command();
if (readtoken() == TPIPE) {
pipenode = (union node *)stalloc(sizeof (struct npipe));
pipenode->type = NPIPE;
pipenode->npipe.backgnd = 0;
lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
pipenode->npipe.cmdlist = lp;
lp->n = n1;
do {
prev = lp;
lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
checkkwd = CHKNL | CHKKWD | CHKALIAS;
lp->n = command();
prev->next = lp;
} while (readtoken() == TPIPE);
lp->next = NULL;
n1 = pipenode;
}
tokpushback++;
if (negate) {
n2 = (union node *)stalloc(sizeof (struct nnot));
n2->type = NNOT;
n2->nnot.com = n1;
return n2;
} else
return n1;
}
static union node *
command(void)
{
union node *n1, *n2;
union node *ap, **app;
union node *cp, **cpp;
union node *redir, **rpp;
union node **rpp2;
int t;
redir = NULL;
rpp2 = &redir;
switch (readtoken()) {
default:
synexpect(-1);
/* NOTREACHED */
case TIF:
n1 = (union node *)stalloc(sizeof (struct nif));
n1->type = NIF;
n1->nif.test = list(0);
if (readtoken() != TTHEN)
synexpect(TTHEN);
n1->nif.ifpart = list(0);
n2 = n1;
while (readtoken() == TELIF) {
n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
n2 = n2->nif.elsepart;
n2->type = NIF;
n2->nif.test = list(0);
if (readtoken() != TTHEN)
synexpect(TTHEN);
n2->nif.ifpart = list(0);
}
if (lasttoken == TELSE)
n2->nif.elsepart = list(0);
else {
n2->nif.elsepart = NULL;
tokpushback++;
}
t = TFI;
break;
case TWHILE:
case TUNTIL: {
int got;
n1 = (union node *)stalloc(sizeof (struct nbinary));
n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
n1->nbinary.ch1 = list(0);
if ((got=readtoken()) != TDO) {
TRACE(("expecting DO got %s %s\n", tokname(got), got == TWORD ? wordtext : ""));
synexpect(TDO);
}
n1->nbinary.ch2 = list(0);
t = TDONE;
break;
}
case TFOR:
if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
synerror("Bad for loop variable");
n1 = (union node *)stalloc(sizeof (struct nfor));
n1->type = NFOR;
n1->nfor.var = wordtext;
checkkwd = CHKKWD | CHKALIAS;
if (readtoken() == TIN) {
app = &ap;
while (readtoken() == TWORD) {
n2 = (union node *)stalloc(sizeof (struct narg));
n2->type = NARG;
n2->narg.text = wordtext;
n2->narg.backquote = backquotelist;
*app = n2;
app = &n2->narg.next;
}
*app = NULL;
n1->nfor.args = ap;
if (lasttoken != TNL && lasttoken != TSEMI)
synexpect(-1);
} else {
n2 = (union node *)stalloc(sizeof (struct narg));
n2->type = NARG;
n2->narg.text = (char *)dolatstr;
n2->narg.backquote = NULL;
n2->narg.next = NULL;
n1->nfor.args = n2;
/*
* Newline or semicolon here is optional (but note
* that the original Bourne shell only allowed NL).
*/
if (lasttoken != TNL && lasttoken != TSEMI)
tokpushback++;
}
checkkwd = CHKNL | CHKKWD | CHKALIAS;
if (readtoken() != TDO)
synexpect(TDO);
n1->nfor.body = list(0);
t = TDONE;
break;
case TCASE:
n1 = (union node *)stalloc(sizeof (struct ncase));
n1->type = NCASE;
if (readtoken() != TWORD)
synexpect(TWORD);
n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
n2->type = NARG;
n2->narg.text = wordtext;
n2->narg.backquote = backquotelist;
n2->narg.next = NULL;
do {
checkkwd = CHKKWD | CHKALIAS;
} while (readtoken() == TNL);
if (lasttoken != TIN)
synexpect(TIN);
cpp = &n1->ncase.cases;
next_case:
checkkwd = CHKNL | CHKKWD;
t = readtoken();
while(t != TESAC) {
if (lasttoken == TLP)
readtoken();
*cpp = cp = (union node *)stalloc(sizeof (struct nclist));
cp->type = NCLIST;
app = &cp->nclist.pattern;
for (;;) {
*app = ap = (union node *)stalloc(sizeof (struct narg));
ap->type = NARG;
ap->narg.text = wordtext;
ap->narg.backquote = backquotelist;
if (readtoken() != TPIPE)
break;
app = &ap->narg.next;
readtoken();
}
ap->narg.next = NULL;
if (lasttoken != TRP)
synexpect(TRP);
cp->nclist.body = list(2);
cpp = &cp->nclist.next;
checkkwd = CHKNL | CHKKWD;
if ((t = readtoken()) != TESAC) {
if (t != TENDCASE)
synexpect(TENDCASE);
else
goto next_case;
}
}
*cpp = NULL;
goto redir;
case TLP:
n1 = (union node *)stalloc(sizeof (struct nredir));
n1->type = NSUBSHELL;
n1->nredir.n = list(0);
n1->nredir.redirect = NULL;
t = TRP;
break;
case TBEGIN:
n1 = list(0);
t = TEND;
break;
case TWORD:
case TREDIR:
tokpushback++;
return simplecmd();
}
if (readtoken() != t)
synexpect(t);
redir:
/* Now check for redirection which may follow command */
checkkwd = CHKKWD | CHKALIAS;
rpp = rpp2;
while (readtoken() == TREDIR) {
*rpp = n2 = redirnode;
rpp = &n2->nfile.next;
parsefname();
}
tokpushback++;
*rpp = NULL;
if (redir) {
if (n1->type != NSUBSHELL) {
n2 = (union node *)stalloc(sizeof (struct nredir));
n2->type = NREDIR;
n2->nredir.n = n1;
n1 = n2;
}
n1->nredir.redirect = redir;
}
return n1;
}
static union node *
simplecmd(void) {
union node *args, **app;
union node *n = NULL;
union node *vars, **vpp;
union node **rpp, *redir;
int savecheckkwd;
args = NULL;
app = &args;
vars = NULL;
vpp = &vars;
redir = NULL;
rpp = &redir;
savecheckkwd = CHKALIAS;
for (;;) {
checkkwd = savecheckkwd;
switch (readtoken()) {
case TWORD:
n = (union node *)stalloc(sizeof (struct narg));
n->type = NARG;
n->narg.text = wordtext;
n->narg.backquote = backquotelist;
if (savecheckkwd && isassignment(wordtext)) {
*vpp = n;
vpp = &n->narg.next;
} else {
*app = n;
app = &n->narg.next;
savecheckkwd = 0;
}
break;
case TREDIR:
*rpp = n = redirnode;
rpp = &n->nfile.next;
parsefname(); /* read name of redirection file */
break;
case TLP:
if (
args && app == &args->narg.next &&
!vars && !redir
) {
struct builtincmd *bcmd;
const char *name;
/* We have a function */
if (readtoken() != TRP)
synexpect(TRP);
name = n->narg.text;
if (
!goodname(name) || (
(bcmd = find_builtin(name)) &&
IS_BUILTIN_SPECIAL(bcmd)
)
)
synerror("Bad function name");
n->type = NDEFUN;
checkkwd = CHKNL | CHKKWD | CHKALIAS;
n->narg.next = command();
return n;
}
/* fall through */
default:
tokpushback++;
goto out;
}
}
out:
*app = NULL;
*vpp = NULL;
*rpp = NULL;
n = (union node *)stalloc(sizeof (struct ncmd));
n->type = NCMD;
n->ncmd.args = args;
n->ncmd.assign = vars;
n->ncmd.redirect = redir;
return n;
}
static union node *
makename(void)
{
union node *n;
n = (union node *)stalloc(sizeof (struct narg));
n->type = NARG;
n->narg.next = NULL;
n->narg.text = wordtext;
n->narg.backquote = backquotelist;
return n;
}
void fixredir(union node *n, const char *text, int err)
{
TRACE(("Fix redir %s %d\n", text, err));
if (!err)
n->ndup.vname = NULL;
if (is_digit(text[0]) && text[1] == '\0')
n->ndup.dupfd = digit_val(text[0]);
else if (text[0] == '-' && text[1] == '\0')
n->ndup.dupfd = -1;
else {
if (err)
synerror("Bad fd number");
else
n->ndup.vname = makename();
}
}
static void
parsefname(void)
{
union node *n = redirnode;
if (readtoken() != TWORD)
synexpect(-1);
if (n->type == NHERE) {
struct heredoc *here = heredoc;
struct heredoc *p;
int i;
if (quoteflag == 0)
n->type = NXHERE;
TRACE(("Here document %d\n", n->type));
if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
synerror("Illegal eof marker for << redirection");
rmescapes(wordtext);
here->eofmark = wordtext;
here->next = NULL;
if (heredoclist == NULL)
heredoclist = here;
else {
for (p = heredoclist ; p->next ; p = p->next);
p->next = here;
}
} else if (n->type == NTOFD || n->type == NFROMFD) {
fixredir(n, wordtext, 0);
} else {
n->nfile.fname = makename();
}
}
/*
* Input any here documents.
*/
static void
parseheredoc(void)
{
struct heredoc *here;
union node *n;
here = heredoclist;
heredoclist = 0;
while (here) {
if (needprompt) {
setprompt(2);
needprompt = 0;
}
readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
here->eofmark, here->striptabs);
n = (union node *)stalloc(sizeof (struct narg));
n->narg.type = NARG;
n->narg.next = NULL;
n->narg.text = wordtext;
n->narg.backquote = backquotelist;
here->here->nhere.doc = n;
here = here->next;
}
}
static char peektoken(void)
{
int t;
t = readtoken();
tokpushback++;
return tokname_array[t][0];
}
static int
readtoken(void)
{
int t;
#ifdef DEBUG
int alreadyseen = tokpushback;
#endif
#ifdef CONFIG_ASH_ALIAS
top:
#endif
t = xxreadtoken();
/*
* eat newlines
*/
if (checkkwd & CHKNL) {
while (t == TNL) {
parseheredoc();
t = xxreadtoken();
}
}
if (t != TWORD || quoteflag) {
goto out;
}
/*
* check for keywords
*/
if (checkkwd & CHKKWD) {
const char *const *pp;
if ((pp = findkwd(wordtext))) {
lasttoken = t = pp - tokname_array;
TRACE(("keyword %s recognized\n", tokname(t)));
goto out;
}
}
if (checkkwd & CHKALIAS) {
#ifdef CONFIG_ASH_ALIAS
struct alias *ap;
if ((ap = lookupalias(wordtext, 1)) != NULL) {
if (*ap->val) {
pushstring(ap->val, ap);
}
goto top;
}
#endif
}
out:
checkkwd = 0;
#ifdef DEBUG
if (!alreadyseen)
TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
else
TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
#endif
return (t);
}
/*
* Read the next input token.
* If the token is a word, we set backquotelist to the list of cmds in
* backquotes. We set quoteflag to true if any part of the word was
* quoted.
* If the token is TREDIR, then we set redirnode to a structure containing
* the redirection.
* In all cases, the variable startlinno is set to the number of the line
* on which the token starts.
*
* [Change comment: here documents and internal procedures]
* [Readtoken shouldn't have any arguments. Perhaps we should make the
* word parsing code into a separate routine. In this case, readtoken
* doesn't need to have any internal procedures, but parseword does.
* We could also make parseoperator in essence the main routine, and
* have parseword (readtoken1?) handle both words and redirection.]
*/
#define NEW_xxreadtoken
#ifdef NEW_xxreadtoken
/* singles must be first! */
static const char xxreadtoken_chars[7] = { '\n', '(', ')', '&', '|', ';', 0 };
static const char xxreadtoken_tokens[] = {
TNL, TLP, TRP, /* only single occurrence allowed */
TBACKGND, TPIPE, TSEMI, /* if single occurrence */
TEOF, /* corresponds to trailing nul */
TAND, TOR, TENDCASE, /* if double occurrence */
};
#define xxreadtoken_doubles \
(sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
#define xxreadtoken_singles \
(sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
static int xxreadtoken()
{
int c;
if (tokpushback) {
tokpushback = 0;
return lasttoken;
}
if (needprompt) {
setprompt(2);
needprompt = 0;
}
startlinno = plinno;
for (;;) { /* until token or start of word found */
c = pgetc_macro();
if ((c != ' ') && (c != '\t')
#ifdef CONFIG_ASH_ALIAS
&& (c != PEOA)
#endif
) {
if (c == '#') {
while ((c = pgetc()) != '\n' && c != PEOF);
pungetc();
} else if (c == '\\') {
if (pgetc() != '\n') {
pungetc();
goto READTOKEN1;
}
startlinno = ++plinno;
if (doprompt)
setprompt(2);
} else {
const char *p
= xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
if (c != PEOF) {
if (c == '\n') {
plinno++;
needprompt = doprompt;
}
p = strchr(xxreadtoken_chars, c);
if (p == NULL) {
READTOKEN1:
return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
}
if (p - xxreadtoken_chars >= xxreadtoken_singles) {
if (pgetc() == *p) { /* double occurrence? */
p += xxreadtoken_doubles + 1;
} else {
pungetc();
}
}
}
return lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
}
}
}
}
#else
#define RETURN(token) return lasttoken = token
static int
xxreadtoken(void)
{
int c;
if (tokpushback) {
tokpushback = 0;
return lasttoken;
}
if (needprompt) {
setprompt(2);
needprompt = 0;
}
startlinno = plinno;
for (;;) { /* until token or start of word found */
c = pgetc_macro();
switch (c) {
case ' ': case '\t':
#ifdef CONFIG_ASH_ALIAS
case PEOA:
#endif
continue;
case '#':
while ((c = pgetc()) != '\n' && c != PEOF);
pungetc();
continue;
case '\\':
if (pgetc() == '\n') {
startlinno = ++plinno;
if (doprompt)
setprompt(2);
continue;
}
pungetc();
goto breakloop;
case '\n':
plinno++;
needprompt = doprompt;
RETURN(TNL);
case PEOF:
RETURN(TEOF);
case '&':
if (pgetc() == '&')
RETURN(TAND);
pungetc();
RETURN(TBACKGND);
case '|':
if (pgetc() == '|')
RETURN(TOR);
pungetc();
RETURN(TPIPE);
case ';':
if (pgetc() == ';')
RETURN(TENDCASE);
pungetc();
RETURN(TSEMI);
case '(':
RETURN(TLP);
case ')':
RETURN(TRP);
default:
goto breakloop;
}
}
breakloop:
return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
#undef RETURN
}
#endif /* NEW_xxreadtoken */
/*
* If eofmark is NULL, read a word or a redirection symbol. If eofmark
* is not NULL, read a here document. In the latter case, eofmark is the
* word which marks the end of the document and striptabs is true if
* leading tabs should be stripped from the document. The argument firstc
* is the first character of the input token or document.
*
* Because C does not have internal subroutines, I have simulated them
* using goto's to implement the subroutine linkage. The following macros
* will run code that appears at the end of readtoken1.
*/
#define CHECKEND() {goto checkend; checkend_return:;}
#define PARSEREDIR() {goto parseredir; parseredir_return:;}
#define PARSESUB() {goto parsesub; parsesub_return:;}
#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
#define PARSEARITH() {goto parsearith; parsearith_return:;}
static int
readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
{
int c = firstc;
char *out;
int len;
char line[EOFMARKLEN + 1];
struct nodelist *bqlist;
int quotef;
int dblquote;
int varnest; /* levels of variables expansion */
int arinest; /* levels of arithmetic expansion */
int parenlevel; /* levels of parens in arithmetic */
int dqvarnest; /* levels of variables expansion within double quotes */
int oldstyle;
int prevsyntax; /* syntax before arithmetic */
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &out;
(void) &quotef;
(void) &dblquote;
(void) &varnest;
(void) &arinest;
(void) &parenlevel;
(void) &dqvarnest;
(void) &oldstyle;
(void) &prevsyntax;
(void) &syntax;
#endif
startlinno = plinno;
dblquote = 0;
if (syntax == DQSYNTAX)
dblquote = 1;
quotef = 0;
bqlist = NULL;
varnest = 0;
arinest = 0;
parenlevel = 0;
dqvarnest = 0;
STARTSTACKSTR(out);
loop: { /* for each line, until end of word */
CHECKEND(); /* set c to PEOF if at end of here document */
for (;;) { /* until end of line or end of word */
CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
switch(SIT(c, syntax)) {
case CNL: /* '\n' */
if (syntax == BASESYNTAX)
goto endword; /* exit outer loop */
USTPUTC(c, out);
plinno++;
if (doprompt)
setprompt(2);
c = pgetc();
goto loop; /* continue outer loop */
case CWORD:
USTPUTC(c, out);
break;
case CCTL:
if (eofmark == NULL || dblquote)
USTPUTC(CTLESC, out);
USTPUTC(c, out);
break;
case CBACK: /* backslash */
c = pgetc2();
if (c == PEOF) {
USTPUTC(CTLESC, out);
USTPUTC('\\', out);
pungetc();
} else if (c == '\n') {
if (doprompt)
setprompt(2);
} else {
if (
dblquote &&
c != '\\' && c != '`' &&
c != '$' && (
c != '"' ||
eofmark != NULL
)
) {
USTPUTC(CTLESC, out);
USTPUTC('\\', out);
}
if (SIT(c, SQSYNTAX) == CCTL)
USTPUTC(CTLESC, out);
USTPUTC(c, out);
quotef++;
}
break;
case CSQUOTE:
syntax = SQSYNTAX;
quotemark:
if (eofmark == NULL) {
USTPUTC(CTLQUOTEMARK, out);
}
break;
case CDQUOTE:
syntax = DQSYNTAX;
dblquote = 1;
goto quotemark;
case CENDQUOTE:
if (eofmark != NULL && arinest == 0 &&
varnest == 0) {
USTPUTC(c, out);
} else {
if (dqvarnest == 0) {
syntax = BASESYNTAX;
dblquote = 0;
}
quotef++;
goto quotemark;
}
break;
case CVAR: /* '$' */
PARSESUB(); /* parse substitution */
break;
case CENDVAR: /* '}' */
if (varnest > 0) {
varnest--;
if (dqvarnest > 0) {
dqvarnest--;
}
USTPUTC(CTLENDVAR, out);
} else {
USTPUTC(c, out);
}
break;
#ifdef CONFIG_ASH_MATH_SUPPORT
case CLP: /* '(' in arithmetic */
parenlevel++;
USTPUTC(c, out);
break;
case CRP: /* ')' in arithmetic */
if (parenlevel > 0) {
USTPUTC(c, out);
--parenlevel;
} else {
if (pgetc() == ')') {
if (--arinest == 0) {
USTPUTC(CTLENDARI, out);
syntax = prevsyntax;
if (syntax == DQSYNTAX)
dblquote = 1;
else
dblquote = 0;
} else
USTPUTC(')', out);
} else {
/*
* unbalanced parens
* (don't 2nd guess - no error)
*/
pungetc();
USTPUTC(')', out);
}
}
break;
#endif
case CBQUOTE: /* '`' */
PARSEBACKQOLD();
break;
case CENDFILE:
goto endword; /* exit outer loop */
case CIGN:
break;
default:
if (varnest == 0)
goto endword; /* exit outer loop */
#ifdef CONFIG_ASH_ALIAS
if (c != PEOA)
#endif
USTPUTC(c, out);
}
c = pgetc_macro();
}
}
endword:
#ifdef CONFIG_ASH_MATH_SUPPORT
if (syntax == ARISYNTAX)
synerror("Missing '))'");
#endif
if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
synerror("Unterminated quoted string");
if (varnest != 0) {
startlinno = plinno;
/* { */
synerror("Missing '}'");
}
USTPUTC('\0', out);
len = out - (char *)stackblock();
out = stackblock();
if (eofmark == NULL) {
if ((c == '>' || c == '<')
&& quotef == 0
&& len <= 2
&& (*out == '\0' || is_digit(*out))) {
PARSEREDIR();
return lasttoken = TREDIR;
} else {
pungetc();
}
}
quoteflag = quotef;
backquotelist = bqlist;
grabstackblock(len);
wordtext = out;
return lasttoken = TWORD;
/* end of readtoken routine */
/*
* Check to see whether we are at the end of the here document. When this
* is called, c is set to the first character of the next input line. If
* we are at the end of the here document, this routine sets the c to PEOF.
*/
checkend: {
if (eofmark) {
#ifdef CONFIG_ASH_ALIAS
if (c == PEOA) {
c = pgetc2();
}
#endif
if (striptabs) {
while (c == '\t') {
c = pgetc2();
}
}
if (c == *eofmark) {
if (pfgets(line, sizeof line) != NULL) {
char *p, *q;
p = line;
for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
if (*p == '\n' && *q == '\0') {
c = PEOF;
plinno++;
needprompt = doprompt;
} else {
pushstring(line, NULL);
}
}
}
}
goto checkend_return;
}
/*
* Parse a redirection operator. The variable "out" points to a string
* specifying the fd to be redirected. The variable "c" contains the
* first character of the redirection operator.
*/
parseredir: {
char fd = *out;
union node *np;
np = (union node *)stalloc(sizeof (struct nfile));
if (c == '>') {
np->nfile.fd = 1;
c = pgetc();
if (c == '>')
np->type = NAPPEND;
else if (c == '|')
np->type = NCLOBBER;
else if (c == '&')
np->type = NTOFD;
else {
np->type = NTO;
pungetc();
}
} else { /* c == '<' */
np->nfile.fd = 0;
switch (c = pgetc()) {
case '<':
if (sizeof (struct nfile) != sizeof (struct nhere)) {
np = (union node *)stalloc(sizeof (struct nhere));
np->nfile.fd = 0;
}
np->type = NHERE;
heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
heredoc->here = np;
if ((c = pgetc()) == '-') {
heredoc->striptabs = 1;
} else {
heredoc->striptabs = 0;
pungetc();
}
break;
case '&':
np->type = NFROMFD;
break;
case '>':
np->type = NFROMTO;
break;
default:
np->type = NFROM;
pungetc();
break;
}
}
if (fd != '\0')
np->nfile.fd = digit_val(fd);
redirnode = np;
goto parseredir_return;
}
/*
* Parse a substitution. At this point, we have read the dollar sign
* and nothing else.
*/
parsesub: {
int subtype;
int typeloc;
int flags;
char *p;
static const char types[] = "}-+?=";
c = pgetc();
if (
c <= PEOA_OR_PEOF ||
(c != '(' && c != '{' && !is_name(c) && !is_special(c))
) {
USTPUTC('$', out);
pungetc();
} else if (c == '(') { /* $(command) or $((arith)) */
if (pgetc() == '(') {
#ifdef CONFIG_ASH_MATH_SUPPORT
PARSEARITH();
#else
synerror("We unsupport $((arith))");
#endif
} else {
pungetc();
PARSEBACKQNEW();
}
} else {
USTPUTC(CTLVAR, out);
typeloc = out - (char *)stackblock();
USTPUTC(VSNORMAL, out);
subtype = VSNORMAL;
if (c == '{') {
c = pgetc();
if (c == '#') {
if ((c = pgetc()) == '}')
c = '#';
else
subtype = VSLENGTH;
}
else
subtype = 0;
}
if (c > PEOA_OR_PEOF && is_name(c)) {
do {
STPUTC(c, out);
c = pgetc();
} while (c > PEOA_OR_PEOF && is_in_name(c));
} else if (is_digit(c)) {
do {
STPUTC(c, out);
c = pgetc();
} while (is_digit(c));
}
else if (is_special(c)) {
USTPUTC(c, out);
c = pgetc();
}
else
badsub: synerror("Bad substitution");
STPUTC('=', out);
flags = 0;
if (subtype == 0) {
switch (c) {
case ':':
flags = VSNUL;
c = pgetc();
/*FALLTHROUGH*/
default:
p = strchr(types, c);
if (p == NULL)
goto badsub;
subtype = p - types + VSNORMAL;
break;
case '%':
case '#':
{
int cc = c;
subtype = c == '#' ? VSTRIMLEFT :
VSTRIMRIGHT;
c = pgetc();
if (c == cc)
subtype++;
else
pungetc();
break;
}
}
} else {
pungetc();
}
if (dblquote || arinest)
flags |= VSQUOTE;
*((char *)stackblock() + typeloc) = subtype | flags;
if (subtype != VSNORMAL) {
varnest++;
if (dblquote || arinest) {
dqvarnest++;
}
}
}
goto parsesub_return;
}
/*
* Called to parse command substitutions. Newstyle is set if the command
* is enclosed inside $(...); nlpp is a pointer to the head of the linked
* list of commands (passed by reference), and savelen is the number of
* characters on the top of the stack which must be preserved.
*/
parsebackq: {
struct nodelist **nlpp;
int savepbq;
union node *n;
char *volatile str;
struct jmploc jmploc;
struct jmploc *volatile savehandler;
size_t savelen;
int saveprompt;
#ifdef __GNUC__
(void) &saveprompt;
#endif
savepbq = parsebackquote;
if (setjmp(jmploc.loc)) {
if (str)
ckfree(str);
parsebackquote = 0;
handler = savehandler;
longjmp(handler->loc, 1);
}
INTOFF;
str = NULL;
savelen = out - (char *)stackblock();
if (savelen > 0) {
str = ckmalloc(savelen);
memcpy(str, stackblock(), savelen);
}
savehandler = handler;
handler = &jmploc;
INTON;
if (oldstyle) {
/* We must read until the closing backquote, giving special
treatment to some slashes, and then push the string and
reread it as input, interpreting it normally. */
char *pout;
int pc;
size_t psavelen;
char *pstr;
STARTSTACKSTR(pout);
for (;;) {
if (needprompt) {
setprompt(2);
needprompt = 0;
}
switch (pc = pgetc()) {
case '`':
goto done;
case '\\':
if ((pc = pgetc()) == '\n') {
plinno++;
if (doprompt)
setprompt(2);
/*
* If eating a newline, avoid putting
* the newline into the new character
* stream (via the STPUTC after the
* switch).
*/
continue;
}
if (pc != '\\' && pc != '`' && pc != '$'
&& (!dblquote || pc != '"'))
STPUTC('\\', pout);
if (pc > PEOA_OR_PEOF) {
break;
}
/* fall through */
case PEOF:
#ifdef CONFIG_ASH_ALIAS
case PEOA:
#endif
startlinno = plinno;
synerror("EOF in backquote substitution");
case '\n':
plinno++;
needprompt = doprompt;
break;
default:
break;
}
STPUTC(pc, pout);
}
done:
STPUTC('\0', pout);
psavelen = pout - (char *)stackblock();
if (psavelen > 0) {
pstr = grabstackstr(pout);
setinputstring(pstr);
}
}
nlpp = &bqlist;
while (*nlpp)
nlpp = &(*nlpp)->next;
*nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
(*nlpp)->next = NULL;
parsebackquote = oldstyle;
if (oldstyle) {
saveprompt = doprompt;
doprompt = 0;
}
n = list(2);
if (oldstyle)
doprompt = saveprompt;
else {
if (readtoken() != TRP)
synexpect(TRP);
}
(*nlpp)->n = n;
if (oldstyle) {
/*
* Start reading from old file again, ignoring any pushed back
* tokens left from the backquote parsing
*/
popfile();
tokpushback = 0;
}
while (stackblocksize() <= savelen)
growstackblock();
STARTSTACKSTR(out);
if (str) {
memcpy(out, str, savelen);
STADJUST(savelen, out);
INTOFF;
ckfree(str);
str = NULL;
INTON;
}
parsebackquote = savepbq;
handler = savehandler;
if (arinest || dblquote)
USTPUTC(CTLBACKQ | CTLQUOTE, out);
else
USTPUTC(CTLBACKQ, out);
if (oldstyle)
goto parsebackq_oldreturn;
else
goto parsebackq_newreturn;
}
#ifdef CONFIG_ASH_MATH_SUPPORT
/*
* Parse an arithmetic expansion (indicate start of one and set state)
*/
parsearith: {
if (++arinest == 1) {
prevsyntax = syntax;
syntax = ARISYNTAX;
USTPUTC(CTLARI, out);
if (dblquote)
USTPUTC('"',out);
else
USTPUTC(' ',out);
} else {
/*
* we collapse embedded arithmetic expansion to
* parenthesis, which should be equivalent
*/
USTPUTC('(', out);
}
goto parsearith_return;
}
#endif
} /* end of readtoken */
/*
* Returns true if the text contains nothing to expand (no dollar signs
* or backquotes).
*/
static int
noexpand(char *text)
{
char *p;
char c;
p = text;
while ((c = *p++) != '\0') {
if (c == CTLQUOTEMARK)
continue;
if (c == CTLESC)
p++;
else if (SIT(c, BASESYNTAX) == CCTL)
return 0;
}
return 1;
}
/*
* Return of a legal variable name (a letter or underscore followed by zero or
* more letters, underscores, and digits).
*/
char *
endofname(const char *name)
{
char *p;
p = (char *) name;
if (! is_name(*p))
return p;
while (*++p) {
if (! is_in_name(*p))
break;
}
return p;
}
/*
* Called when an unexpected token is read during the parse. The argument
* is the token that is expected, or -1 if more than one type of token can
* occur at this point.
*/
static void synexpect(int token)
{
char msg[64];
int l;
l = sprintf(msg, "%s unexpected", tokname(lasttoken));
if (token >= 0)
sprintf(msg + l, " (expecting %s)", tokname(token));
synerror(msg);
/* NOTREACHED */
}
static void
synerror(const char *msg)
{
error("Syntax error: %s", msg);
/* NOTREACHED */
}
/*
* called by editline -- any expansions to the prompt
* should be added here.
*/
static void setprompt(int whichprompt)
{
const char *prompt;
switch (whichprompt) {
case 1:
prompt = ps1val();
break;
case 2:
prompt = ps2val();
break;
default: /* 0 */
prompt = nullstr;
}
putprompt(prompt);
}
static const char *const *findkwd(const char *s)
{
return bsearch(s, tokname_array + KWDOFFSET,
(sizeof(tokname_array) / sizeof(const char *)) - KWDOFFSET,
sizeof(const char *), pstrcmp);
}
/* $NetBSD: redir.c,v 1.27 2002/11/24 22:35:42 christos Exp $ */
/*
* Code for dealing with input/output redirection.
*/
#define EMPTY -2 /* marks an unused slot in redirtab */
#ifndef PIPE_BUF
# define PIPESIZE 4096 /* amount of buffering in a pipe */
#else
# define PIPESIZE PIPE_BUF
#endif
/*
* Open a file in noclobber mode.
* The code was copied from bash.
*/
static inline int
noclobberopen(const char *fname)
{
int r, fd;
struct stat finfo, finfo2;
/*
* If the file exists and is a regular file, return an error
* immediately.
*/
r = stat(fname, &finfo);
if (r == 0 && S_ISREG(finfo.st_mode)) {
errno = EEXIST;
return -1;
}
/*
* If the file was not present (r != 0), make sure we open it
* exclusively so that if it is created before we open it, our open
* will fail. Make sure that we do not truncate an existing file.
* Note that we don't turn on O_EXCL unless the stat failed -- if the
* file was not a regular file, we leave O_EXCL off.
*/
if (r != 0)
return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
fd = open(fname, O_WRONLY|O_CREAT, 0666);
/* If the open failed, return the file descriptor right away. */
if (fd < 0)
return fd;
/*
* OK, the open succeeded, but the file may have been changed from a
* non-regular file to a regular file between the stat and the open.
* We are assuming that the O_EXCL open handles the case where FILENAME
* did not exist and is symlinked to an existing file between the stat
* and open.
*/
/*
* If we can open it and fstat the file descriptor, and neither check
* revealed that it was a regular file, and the file has not been
* replaced, return the file descriptor.
*/
if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
return fd;
/* The file has been replaced. badness. */
close(fd);
errno = EEXIST;
return -1;
}
/*
* Handle here documents. Normally we fork off a process to write the
* data to a pipe. If the document is short, we can stuff the data in
* the pipe without forking.
*/
static inline int
openhere(union node *redir)
{
int pip[2];
size_t len = 0;
if (pipe(pip) < 0)
error("Pipe call failed");
if (redir->type == NHERE) {
len = strlen(redir->nhere.doc->narg.text);
if (len <= PIPESIZE) {
xwrite(pip[1], redir->nhere.doc->narg.text, len);
goto out;
}
}
if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
close(pip[0]);
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
#endif
signal(SIGPIPE, SIG_DFL);
if (redir->type == NHERE)
xwrite(pip[1], redir->nhere.doc->narg.text, len);
else
expandhere(redir->nhere.doc, pip[1]);
_exit(0);
}
out:
close(pip[1]);
return pip[0];
}
static int
openredirect(union node *redir)
{
char *fname;
int f;
switch (redir->nfile.type) {
case NFROM:
fname = redir->nfile.expfname;
if ((f = open(fname, O_RDONLY)) < 0)
goto eopen;
break;
case NFROMTO:
fname = redir->nfile.expfname;
if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
goto ecreate;
break;
case NTO:
/* Take care of noclobber mode. */
if (Cflag) {
fname = redir->nfile.expfname;
if ((f = noclobberopen(fname)) < 0)
goto ecreate;
break;
}
/* FALLTHROUGH */
case NCLOBBER:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
goto ecreate;
break;
case NAPPEND:
fname = redir->nfile.expfname;
if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
goto ecreate;
break;
default:
#ifdef DEBUG
abort();
#endif
/* Fall through to eliminate warning. */
case NTOFD:
case NFROMFD:
f = -1;
break;
case NHERE:
case NXHERE:
f = openhere(redir);
break;
}
return f;
ecreate:
error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
eopen:
error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
}
static inline void
dupredirect(union node *redir, int f)
{
int fd = redir->nfile.fd;
if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
copyfd(redir->ndup.dupfd, fd);
}
return;
}
if (f != fd) {
copyfd(f, fd);
close(f);
}
return;
}
/*
* Process a list of redirection commands. If the REDIR_PUSH flag is set,
* old file descriptors are stashed away so that the redirection can be
* undone by calling popredir. If the REDIR_BACKQ flag is set, then the
* standard output, and the standard error if it becomes a duplicate of
* stdout, is saved in memory.
*/
static void
redirect(union node *redir, int flags)
{
union node *n;
struct redirtab *sv;
int i;
int fd;
int newfd;
int *p;
nullredirs++;
if (!redir) {
return;
}
sv = NULL;
INTOFF;
if (flags & REDIR_PUSH) {
struct redirtab *q;
q = ckmalloc(sizeof (struct redirtab));
q->next = redirlist;
redirlist = q;
q->nullredirs = nullredirs - 1;
for (i = 0 ; i < 10 ; i++)
q->renamed[i] = EMPTY;
nullredirs = 0;
sv = q;
}
n = redir;
do {
fd = n->nfile.fd;
if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
n->ndup.dupfd == fd)
continue; /* redirect from/to same file descriptor */
newfd = openredirect(n);
if (fd == newfd)
continue;
if (sv && *(p = &sv->renamed[fd]) == EMPTY) {
i = fcntl(fd, F_DUPFD, 10);
if (i == -1) {
i = errno;
if (i != EBADF) {
close(newfd);
errno = i;
error("%d: %m", fd);
/* NOTREACHED */
}
} else {
*p = i;
close(fd);
}
} else {
close(fd);
}
dupredirect(n, newfd);
} while ((n = n->nfile.next));
INTON;
}
/*
* Undo the effects of the last redirection.
*/
void
popredir(int drop)
{
struct redirtab *rp;
int i;
if (--nullredirs >= 0)
return;
INTOFF;
rp = redirlist;
for (i = 0 ; i < 10 ; i++) {
if (rp->renamed[i] != EMPTY) {
if (!drop) {
close(i);
copyfd(rp->renamed[i], i);
}
close(rp->renamed[i]);
}
}
redirlist = rp->next;
nullredirs = rp->nullredirs;
ckfree(rp);
INTON;
}
/*
* Undo all redirections. Called on error or interrupt.
*/
/*
* Discard all saved file descriptors.
*/
void
clearredir(int drop)
{
for (;;) {
nullredirs = 0;
if (!redirlist)
break;
popredir(drop);
}
}
/*
* Copy a file descriptor to be >= to. Returns -1
* if the source file descriptor is closed, EMPTY if there are no unused
* file descriptors left.
*/
int
copyfd(int from, int to)
{
int newfd;
newfd = fcntl(from, F_DUPFD, to);
if (newfd < 0) {
if (errno == EMFILE)
return EMPTY;
else
error("%d: %m", from);
}
return newfd;
}
int
redirectsafe(union node *redir, int flags)
{
int err;
volatile int saveint;
struct jmploc *volatile savehandler = handler;
struct jmploc jmploc;
SAVEINT(saveint);
if (!(err = setjmp(jmploc.loc) * 2)) {
handler = &jmploc;
redirect(redir, flags);
}
handler = savehandler;
if (err && exception != EXERROR)
longjmp(handler->loc, 1);
RESTOREINT(saveint);
return err;
}
/* $NetBSD: show.c,v 1.24 2003/01/22 20:36:04 dsl Exp $ */
#ifdef DEBUG
static void shtree(union node *, int, char *, FILE*);
static void shcmd(union node *, FILE *);
static void sharg(union node *, FILE *);
static void indent(int, char *, FILE *);
static void trstring(char *);
void
showtree(union node *n)
{
trputs("showtree called\n");
shtree(n, 1, NULL, stdout);
}
static void
shtree(union node *n, int ind, char *pfx, FILE *fp)
{
struct nodelist *lp;
const char *s;
if (n == NULL)
return;
indent(ind, pfx, fp);
switch(n->type) {
case NSEMI:
s = "; ";
goto binop;
case NAND:
s = " && ";
goto binop;
case NOR:
s = " || ";
binop:
shtree(n->nbinary.ch1, ind, NULL, fp);
/* if (ind < 0) */
fputs(s, fp);
shtree(n->nbinary.ch2, ind, NULL, fp);
break;
case NCMD:
shcmd(n, fp);
if (ind >= 0)
putc('\n', fp);
break;
case NPIPE:
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
shcmd(lp->n, fp);
if (lp->next)
fputs(" | ", fp);
}
if (n->npipe.backgnd)
fputs(" &", fp);
if (ind >= 0)
putc('\n', fp);
break;
default:
fprintf(fp, "<node type %d>", n->type);
if (ind >= 0)
putc('\n', fp);
break;
}
}
static void
shcmd(union node *cmd, FILE *fp)
{
union node *np;
int first;
const char *s;
int dftfd;
first = 1;
for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
if (! first)
putchar(' ');
sharg(np, fp);
first = 0;
}
for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
if (! first)
putchar(' ');
switch (np->nfile.type) {
case NTO: s = ">"; dftfd = 1; break;
case NCLOBBER: s = ">|"; dftfd = 1; break;
case NAPPEND: s = ">>"; dftfd = 1; break;
case NTOFD: s = ">&"; dftfd = 1; break;
case NFROM: s = "<"; dftfd = 0; break;
case NFROMFD: s = "<&"; dftfd = 0; break;
case NFROMTO: s = "<>"; dftfd = 0; break;
default: s = "*error*"; dftfd = 0; break;
}
if (np->nfile.fd != dftfd)
fprintf(fp, "%d", np->nfile.fd);
fputs(s, fp);
if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
fprintf(fp, "%d", np->ndup.dupfd);
} else {
sharg(np->nfile.fname, fp);
}
first = 0;
}
}
static void
sharg(union node *arg, FILE *fp)
{
char *p;
struct nodelist *bqlist;
int subtype;
if (arg->type != NARG) {
out1fmt("<node type %d>\n", arg->type);
abort();
}
bqlist = arg->narg.backquote;
for (p = arg->narg.text ; *p ; p++) {
switch (*p) {
case CTLESC:
putc(*++p, fp);
break;
case CTLVAR:
putc('$', fp);
putc('{', fp);
subtype = *++p;
if (subtype == VSLENGTH)
putc('#', fp);
while (*p != '=')
putc(*p++, fp);
if (subtype & VSNUL)
putc(':', fp);
switch (subtype & VSTYPE) {
case VSNORMAL:
putc('}', fp);
break;
case VSMINUS:
putc('-', fp);
break;
case VSPLUS:
putc('+', fp);
break;
case VSQUESTION:
putc('?', fp);
break;
case VSASSIGN:
putc('=', fp);
break;
case VSTRIMLEFT:
putc('#', fp);
break;
case VSTRIMLEFTMAX:
putc('#', fp);
putc('#', fp);
break;
case VSTRIMRIGHT:
putc('%', fp);
break;
case VSTRIMRIGHTMAX:
putc('%', fp);
putc('%', fp);
break;
case VSLENGTH:
break;
default:
out1fmt("<subtype %d>", subtype);
}
break;
case CTLENDVAR:
putc('}', fp);
break;
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE:
putc('$', fp);
putc('(', fp);
shtree(bqlist->n, -1, NULL, fp);
putc(')', fp);
break;
default:
putc(*p, fp);
break;
}
}
}
static void
indent(int amount, char *pfx, FILE *fp)
{
int i;
for (i = 0 ; i < amount ; i++) {
if (pfx && i == amount - 1)
fputs(pfx, fp);
putc('\t', fp);
}
}
/*
* Debugging stuff.
*/
FILE *tracefile;
void
trputc(int c)
{
if (debug != 1)
return;
putc(c, tracefile);
}
void
trace(const char *fmt, ...)
{
va_list va;
if (debug != 1)
return;
va_start(va, fmt);
(void) vfprintf(tracefile, fmt, va);
va_end(va);
}
void
tracev(const char *fmt, va_list va)
{
if (debug != 1)
return;
(void) vfprintf(tracefile, fmt, va);
}
void
trputs(const char *s)
{
if (debug != 1)
return;
fputs(s, tracefile);
}
static void
trstring(char *s)
{
char *p;
char c;
if (debug != 1)
return;
putc('"', tracefile);
for (p = s ; *p ; p++) {
switch (*p) {
case '\n': c = 'n'; goto backslash;
case '\t': c = 't'; goto backslash;
case '\r': c = 'r'; goto backslash;
case '"': c = '"'; goto backslash;
case '\\': c = '\\'; goto backslash;
case CTLESC: c = 'e'; goto backslash;
case CTLVAR: c = 'v'; goto backslash;
case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
case CTLBACKQ: c = 'q'; goto backslash;
case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
backslash: putc('\\', tracefile);
putc(c, tracefile);
break;
default:
if (*p >= ' ' && *p <= '~')
putc(*p, tracefile);
else {
putc('\\', tracefile);
putc(*p >> 6 & 03, tracefile);
putc(*p >> 3 & 07, tracefile);
putc(*p & 07, tracefile);
}
break;
}
}
putc('"', tracefile);
}
void
trargs(char **ap)
{
if (debug != 1)
return;
while (*ap) {
trstring(*ap++);
if (*ap)
putc(' ', tracefile);
else
putc('\n', tracefile);
}
}
void
opentrace(void)
{
char s[100];
#ifdef O_APPEND
int flags;
#endif
if (debug != 1) {
if (tracefile)
fflush(tracefile);
/* leave open because libedit might be using it */
return;
}
scopy("./trace", s);
if (tracefile) {
if (!freopen(s, "a", tracefile)) {
fprintf(stderr, "Can't re-open %s\n", s);
debug = 0;
return;
}
} else {
if ((tracefile = fopen(s, "a")) == NULL) {
fprintf(stderr, "Can't open %s\n", s);
debug = 0;
return;
}
}
#ifdef O_APPEND
if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
#endif
setlinebuf(tracefile);
fputs("\nTracing started.\n", tracefile);
}
#endif /* DEBUG */
/* $NetBSD: trap.c,v 1.28 2002/11/24 22:35:43 christos Exp $ */
/*
* Sigmode records the current value of the signal handlers for the various
* modes. A value of zero means that the current handler is not known.
* S_HARD_IGN indicates that the signal was ignored on entry to the shell,
*/
#define S_DFL 1 /* default signal handling (SIG_DFL) */
#define S_CATCH 2 /* signal is caught */
#define S_IGN 3 /* signal is ignored (SIG_IGN) */
#define S_HARD_IGN 4 /* signal is ignored permenantly */
#define S_RESET 5 /* temporary - to reset a hard ignored sig */
/*
* The trap builtin.
*/
int
trapcmd(int argc, char **argv)
{
char *action;
char **ap;
int signo;
nextopt(nullstr);
ap = argptr;
if (!*ap) {
for (signo = 0 ; signo < NSIG ; signo++) {
if (trap[signo] != NULL) {
const char *sn;
sn = u_signal_names(0, &signo, 0);
if (sn == NULL)
sn = "???";
out1fmt("trap -- %s %s\n",
single_quote(trap[signo]), sn);
}
}
return 0;
}
if (!ap[1])
action = NULL;
else
action = *ap++;
while (*ap) {
if ((signo = decode_signal(*ap, 0)) < 0)
error("%s: bad trap", *ap);
INTOFF;
if (action) {
if (action[0] == '-' && action[1] == '\0')
action = NULL;
else
action = savestr(action);
}
if (trap[signo])
ckfree(trap[signo]);
trap[signo] = action;
if (signo != 0)
setsignal(signo);
INTON;
ap++;
}
return 0;
}
/*
* Clear traps on a fork.
*/
void
clear_traps(void)
{
char **tp;
for (tp = trap ; tp < &trap[NSIG] ; tp++) {
if (*tp && **tp) { /* trap not NULL or SIG_IGN */
INTOFF;
ckfree(*tp);
*tp = NULL;
if (tp != &trap[0])
setsignal(tp - trap);
INTON;
}
}
}
/*
* Set the signal handler for the specified signal. The routine figures
* out what it should be set to.
*/
void
setsignal(int signo)
{
int action;
char *t, tsig;
struct sigaction act;
if ((t = trap[signo]) == NULL)
action = S_DFL;
else if (*t != '\0')
action = S_CATCH;
else
action = S_IGN;
if (rootshell && action == S_DFL) {
switch (signo) {
case SIGINT:
if (iflag || minusc || sflag == 0)
action = S_CATCH;
break;
case SIGQUIT:
#ifdef DEBUG
if (debug)
break;
#endif
/* FALLTHROUGH */
case SIGTERM:
if (iflag)
action = S_IGN;
break;
#if JOBS
case SIGTSTP:
case SIGTTOU:
if (mflag)
action = S_IGN;
break;
#endif
}
}
t = &sigmode[signo - 1];
tsig = *t;
if (tsig == 0) {
/*
* current setting unknown
*/
if (sigaction(signo, 0, &act) == -1) {
/*
* Pretend it worked; maybe we should give a warning
* here, but other shells don't. We don't alter
* sigmode, so that we retry every time.
*/
return;
}
if (act.sa_handler == SIG_IGN) {
if (mflag && (signo == SIGTSTP ||
signo == SIGTTIN || signo == SIGTTOU)) {
tsig = S_IGN; /* don't hard ignore these */
} else
tsig = S_HARD_IGN;
} else {
tsig = S_RESET; /* force to be set */
}
}
if (tsig == S_HARD_IGN || tsig == action)
return;
switch (action) {
case S_CATCH:
act.sa_handler = onsig;
break;
case S_IGN:
act.sa_handler = SIG_IGN;
break;
default:
act.sa_handler = SIG_DFL;
}
*t = action;
act.sa_flags = 0;
sigfillset(&act.sa_mask);
sigaction(signo, &act, 0);
}
/*
* Ignore a signal.
*/
void
ignoresig(int signo)
{
if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
signal(signo, SIG_IGN);
}
sigmode[signo - 1] = S_HARD_IGN;
}
/*
* Signal handler.
*/
void
onsig(int signo)
{
gotsig[signo - 1] = 1;
pendingsigs = signo;
if (exsig || (signo == SIGINT && !trap[SIGINT])) {
if (!suppressint)
onint();
intpending = 1;
}
}
/*
* Called to execute a trap. Perhaps we should avoid entering new trap
* handlers while we are executing a trap handler.
*/
void
dotrap(void)
{
char *p;
char *q;
int savestatus;
savestatus = exitstatus;
q = gotsig;
while (pendingsigs = 0, barrier(), (p = memchr(q, 1, NSIG - 1))) {
*p = 0;
p = trap[p - q + 1];
if (!p)
continue;
evalstring(p, 0);
exitstatus = savestatus;
}
}
/*
* Controls whether the shell is interactive or not.
*/
void
setinteractive(int on)
{
static int is_interactive;
if (++on == is_interactive)
return;
is_interactive = on;
setsignal(SIGINT);
setsignal(SIGQUIT);
setsignal(SIGTERM);
#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
if(is_interactive > 1) {
/* Looks like they want an interactive shell */
static int do_banner;
if(!do_banner) {
out1fmt(
"\n\n" BB_BANNER " Built-in shell (ash)\n"
"Enter 'help' for a list of built-in commands.\n\n");
do_banner++;
}
}
#endif
}
#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
/*** List the available builtins ***/
static int helpcmd(int argc, char **argv)
{
int col, i;
out1fmt("\nBuilt-in commands:\n-------------------\n");
for (col = 0, i = 0; i < NUMBUILTINS; i++) {
col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
builtincmd[i].name + 1);
if (col > 60) {
out1fmt("\n");
col = 0;
}
}
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
{
extern const struct BB_applet applets[];
extern const size_t NUM_APPLETS;
for (i = 0; i < NUM_APPLETS; i++) {
col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), applets[i].name);
if (col > 60) {
out1fmt("\n");
col = 0;
}
}
}
#endif
out1fmt("\n\n");
return EXIT_SUCCESS;
}
#endif /* CONFIG_FEATURE_SH_EXTRA_QUIET */
/*
* Called to exit the shell.
*/
void
exitshell(void)
{
struct jmploc loc;
char *p;
int status;
status = exitstatus;
TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
if (setjmp(loc.loc)) {
goto out;
}
handler = &loc;
if ((p = trap[0]) != NULL && *p != '\0') {
trap[0] = NULL;
evalstring(p, 0);
}
flushall();
#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
if (iflag && rootshell) {
const char *hp = lookupvar("HISTFILE");
if(hp != NULL )
save_history ( hp );
}
#endif
out:
_exit(status);
/* NOTREACHED */
}
static int decode_signal(const char *string, int minsig)
{
int signo;
const char *name = u_signal_names(string, &signo, minsig);
return name ? signo : -1;
}
/* $NetBSD: var.c,v 1.32 2003/01/22 20:36:04 dsl Exp $ */
static struct var *vartab[VTABSIZE];
static int vpcmp(const void *, const void *);
static struct var **findvar(struct var **, const char *);
/*
* Initialize the varable symbol tables and import the environment
*/
#ifdef CONFIG_ASH_GETOPTS
/*
* Safe version of setvar, returns 1 on success 0 on failure.
*/
int
setvarsafe(const char *name, const char *val, int flags)
{
int err;
volatile int saveint;
struct jmploc *volatile savehandler = handler;
struct jmploc jmploc;
SAVEINT(saveint);
if (setjmp(jmploc.loc))
err = 1;
else {
handler = &jmploc;
setvar(name, val, flags);
err = 0;
}
handler = savehandler;
RESTOREINT(saveint);
return err;
}
#endif
/*
* Set the value of a variable. The flags argument is ored with the
* flags of the variable. If val is NULL, the variable is unset.
*/
static void
setvar(const char *name, const char *val, int flags)
{
char *p, *q;
size_t namelen;
char *nameeq;
size_t vallen;
q = endofname(name);
p = strchrnul(q, '=');
namelen = p - name;
if (!namelen || p != q)
error("%.*s: bad variable name", namelen, name);
vallen = 0;
if (val == NULL) {
flags |= VUNSET;
} else {
vallen = strlen(val);
}
INTOFF;
p = mempcpy(nameeq = ckmalloc(namelen + vallen + 2), name, namelen);
*p++ = '\0';
if (vallen) {
p[-1] = '=';
p = mempcpy(p, val, vallen);
}
*p = '\0';
setvareq(nameeq, flags | VNOSAVE);
INTON;
}
/*
* Same as setvar except that the variable and value are passed in
* the first argument as name=value. Since the first argument will
* be actually stored in the table, it should not be a string that
* will go away.
* Called with interrupts off.
*/
void
setvareq(char *s, int flags)
{
struct var *vp, **vpp;
vpp = hashvar(s);
flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
vp = *findvar(vpp, s);
if (vp) {
if (vp->flags & VREADONLY) {
if (flags & VNOSAVE)
free(s);
error("%.*s: is read only", strchrnul(s, '=') - s, s);
}
if (flags & VNOSET)
return;
if (vp->func && (flags & VNOFUNC) == 0)
(*vp->func)(strchrnul(s, '=') + 1);
if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
ckfree(vp->text);
flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
} else {
if (flags & VNOSET)
return;
/* not found */
vp = ckmalloc(sizeof (*vp));
vp->next = *vpp;
vp->func = NULL;
*vpp = vp;
}
if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
s = savestr(s);
vp->text = s;
vp->flags = flags;
}
/*
* Process a linked list of variable assignments.
*/
static void
listsetvar(struct strlist *list_set_var, int flags)
{
struct strlist *lp = list_set_var;
if (!lp)
return;
INTOFF;
do {
setvareq(lp->text, flags);
} while ((lp = lp->next));
INTON;
}
/*
* Find the value of a variable. Returns NULL if not set.
*/
static char *
lookupvar(const char *name)
{
struct var *v;
if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) {
return strchrnul(v->text, '=') + 1;
}
return NULL;
}
/*
* Search the environment of a builtin command.
*/
static char *
bltinlookup(const char *name)
{
struct strlist *sp;
for (sp = cmdenviron ; sp ; sp = sp->next) {
if (varequal(sp->text, name))
return strchrnul(sp->text, '=') + 1;
}
return lookupvar(name);
}
/*
* Generate a list of variables satisfying the given conditions.
*/
static char **
listvars(int on, int off, char ***end)
{
struct var **vpp;
struct var *vp;
char **ep;
int mask;
STARTSTACKSTR(ep);
vpp = vartab;
mask = on | off;
do {
for (vp = *vpp ; vp ; vp = vp->next)
if ((vp->flags & mask) == on) {
if (ep == stackstrend())
ep = growstackstr();
*ep++ = (char *) vp->text;
}
} while (++vpp < vartab + VTABSIZE);
if (ep == stackstrend())
ep = growstackstr();
if (end)
*end = ep;
*ep++ = NULL;
return grabstackstr(ep);
}
/*
* POSIX requires that 'set' (but not export or readonly) output the
* variables in lexicographic order - by the locale's collating order (sigh).
* Maybe we could keep them in an ordered balanced binary tree
* instead of hashed lists.
* For now just roll 'em through qsort for printing...
*/
static int
showvars(const char *sep_prefix, int on, int off)
{
const char *sep;
char **ep, **epend;
ep = listvars(on, off, &epend);
qsort(ep, epend - ep, sizeof(char *), vpcmp);
sep = *sep_prefix ? spcstr : sep_prefix;
for (; ep < epend; ep++) {
const char *p;
const char *q;
p = strchrnul(*ep, '=');
q = nullstr;
if (*p)
q = single_quote(++p);
out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
}
return 0;
}
/*
* The export and readonly commands.
*/
static int
exportcmd(int argc, char **argv)
{
struct var *vp;
char *name;
const char *p;
char **aptr;
int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
int notp;
notp = nextopt("p") - 'p';
if (notp && ((name = *(aptr = argptr)))) {
do {
if ((p = strchr(name, '=')) != NULL) {
p++;
} else {
if ((vp = *findvar(hashvar(name), name))) {
vp->flags |= flag;
continue;
}
}
setvar(name, p, flag);
} while ((name = *++aptr) != NULL);
} else {
showvars(argv[0], flag, 0);
}
return 0;
}
/*
* Make a variable a local variable. When a variable is made local, it's
* value and flags are saved in a localvar structure. The saved values
* will be restored when the shell function returns. We handle the name
* "-" as a special case.
*/
static inline void
mklocal(char *name)
{
struct localvar *lvp;
struct var **vpp;
struct var *vp;
INTOFF;
lvp = ckmalloc(sizeof (struct localvar));
if (name[0] == '-' && name[1] == '\0') {
char *p;
p = ckmalloc(sizeof(optlist));
lvp->text = memcpy(p, optlist, sizeof(optlist));
vp = NULL;
} else {
char *eq;
vpp = hashvar(name);
vp = *findvar(vpp, name);
eq = strchr(name, '=');
if (vp == NULL) {
if (eq)
setvareq(name, VSTRFIXED);
else
setvar(name, NULL, VSTRFIXED);
vp = *vpp; /* the new variable */
lvp->flags = VUNSET;
} else {
lvp->text = vp->text;
lvp->flags = vp->flags;
vp->flags |= VSTRFIXED|VTEXTFIXED;
if (eq)
setvareq(name, 0);
}
}
lvp->vp = vp;
lvp->next = localvars;
localvars = lvp;
INTON;
}
/*
* The "local" command.
*/
static int
localcmd(int argc, char **argv)
{
char *name;
argv = argptr;
while ((name = *argv++) != NULL) {
mklocal(name);
}
return 0;
}
/*
* Called after a function returns.
* Interrupts must be off.
*/
static void
poplocalvars(void)
{
struct localvar *lvp;
struct var *vp;
while ((lvp = localvars) != NULL) {
localvars = lvp->next;
vp = lvp->vp;
TRACE(("poplocalvar %s", vp ? vp->text : "-"));
if (vp == NULL) { /* $- saved */
memcpy(optlist, lvp->text, sizeof(optlist));
ckfree(lvp->text);
optschanged();
} else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
unsetvar(vp->text);
} else {
if (vp->func)
(*vp->func)(strchrnul(lvp->text, '=') + 1);
if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
ckfree(vp->text);
vp->flags = lvp->flags;
vp->text = lvp->text;
}
ckfree(lvp);
}
}
/*
* The unset builtin command. We unset the function before we unset the
* variable to allow a function to be unset when there is a readonly variable
* with the same name.
*/
int
unsetcmd(int argc, char **argv)
{
char **ap;
int i;
int flag = 0;
int ret = 0;
while ((i = nextopt("vf")) != '\0') {
flag = i;
}
for (ap = argptr; *ap ; ap++) {
if (flag != 'f') {
i = unsetvar(*ap);
ret |= i;
if (!(i & 2))
continue;
}
if (flag != 'v')
unsetfunc(*ap);
}
return ret & 1;
}
/*
* Unset the specified variable.
*/
int
unsetvar(const char *s)
{
struct var **vpp;
struct var *vp;
int retval;
vpp = findvar(hashvar(s), s);
vp = *vpp;
retval = 2;
if (vp) {
int flags = vp->flags;
retval = 1;
if (flags & VREADONLY)
goto out;
if (flags & VUNSET)
goto ok;
if ((flags & VSTRFIXED) == 0) {
INTOFF;
if ((flags & (VTEXTFIXED|VSTACK)) == 0)
ckfree(vp->text);
*vpp = vp->next;
ckfree(vp);
INTON;
} else {
setvar(s, 0, 0);
vp->flags &= ~VEXPORT;
}
ok:
retval = 0;
}
out:
return retval;
}
/*
* Find the appropriate entry in the hash table from the name.
*/
static struct var **
hashvar(const char *p)
{
unsigned int hashval;
hashval = ((unsigned char) *p) << 4;
while (*p && *p != '=')
hashval += (unsigned char) *p++;
return &vartab[hashval % VTABSIZE];
}
/*
* Compares two strings up to the first = or '\0'. The first
* string must be terminated by '='; the second may be terminated by
* either '=' or '\0'.
*/
int
varcmp(const char *p, const char *q)
{
int c, d;
while ((c = *p) == (d = *q)) {
if (!c || c == '=')
goto out;
p++;
q++;
}
if (c == '=')
c = 0;
if (d == '=')
d = 0;
out:
return c - d;
}
static int
vpcmp(const void *a, const void *b)
{
return varcmp(*(const char **)a, *(const char **)b);
}
static struct var **
findvar(struct var **vpp, const char *name)
{
for (; *vpp; vpp = &(*vpp)->next) {
if (varequal((*vpp)->text, name)) {
break;
}
}
return vpp;
}
/* $NetBSD: setmode.c,v 1.29 2003/01/15 23:58:03 kleink Exp $ */
/*
* Copyright (c) 1999 Herbert Xu <herbert@debian.org>
* This code for the times builtin.
*/
#include <sys/times.h>
int timescmd(int ac, char **av) {
struct tms buf;
long int clk_tck = sysconf(_SC_CLK_TCK);
times(&buf);
out1fmt("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
(int) (buf.tms_utime / clk_tck / 60),
((double) buf.tms_utime) / clk_tck,
(int) (buf.tms_stime / clk_tck / 60),
((double) buf.tms_stime) / clk_tck,
(int) (buf.tms_cutime / clk_tck / 60),
((double) buf.tms_cutime) / clk_tck,
(int) (buf.tms_cstime / clk_tck / 60),
((double) buf.tms_cstime) / clk_tck);
return 0;
}
#ifdef CONFIG_ASH_MATH_SUPPORT
static int
dash_arith(const char *s)
{
long result = 0;
int errcode = 0;
INTOFF;
result = arith(s, &errcode);
if (errcode < 0) {
if (errcode == -2)
error("divide by zero");
else
synerror(s);
}
INTON;
return (result);
}
/*
* The exp(1) builtin.
*/
static int
expcmd(int argc, char **argv)
{
const char *p;
char *concat;
char **ap;
long i;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
/*
* concatenate arguments
*/
STARTSTACKSTR(concat);
ap = argv + 2;
for (;;) {
while (*p)
STPUTC(*p++, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(' ', concat);
}
STPUTC('\0', concat);
p = grabstackstr(concat);
}
} else
p = nullstr;
i = dash_arith(p);
out1fmt("%ld\n", i);
return (! i);
}
#endif /* CONFIG_ASH_MATH_SUPPORT */
/* $NetBSD: miscbltin.c,v 1.31 2002/11/24 22:35:41 christos Exp $ */
/*
* Miscelaneous builtins.
*/
#undef rflag
#ifdef __GLIBC__
#if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
typedef enum __rlimit_resource rlim_t;
#endif
#endif
/*
* The read builtin. The -e option causes backslashes to escape the
* following character.
*
* This uses unbuffered input, which may be avoidable in some cases.
*/
static int
readcmd(int argc, char **argv)
{
char **ap;
int backslash;
char c;
int rflag;
char *prompt;
const char *ifs;
char *p;
int startword;
int status;
int i;
rflag = 0;
prompt = NULL;
while ((i = nextopt("p:r")) != '\0') {
if (i == 'p')
prompt = optionarg;
else
rflag = 1;
}
if (prompt && isatty(0)) {
out2str(prompt);
flushall();
}
if (*(ap = argptr) == NULL)
error("arg count");
if ((ifs = bltinlookup("IFS")) == NULL)
ifs = defifs;
status = 0;
startword = 1;
backslash = 0;
STARTSTACKSTR(p);
for (;;) {
if (read(0, &c, 1) != 1) {
status = 1;
break;
}
if (c == '\0')
continue;
if (backslash) {
backslash = 0;
if (c != '\n')
goto put;
continue;
}
if (!rflag && c == '\\') {
backslash++;
continue;
}
if (c == '\n')
break;
if (startword && *ifs == ' ' && strchr(ifs, c)) {
continue;
}
startword = 0;
if (ap[1] != NULL && strchr(ifs, c) != NULL) {
STACKSTRNUL(p);
setvar(*ap, stackblock(), 0);
ap++;
startword = 1;
STARTSTACKSTR(p);
} else {
put:
STPUTC(c, p);
}
}
STACKSTRNUL(p);
/* Remove trailing blanks */
while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
*p = '\0';
setvar(*ap, stackblock(), 0);
while (*++ap != NULL)
setvar(*ap, nullstr, 0);
return status;
}
static int umaskcmd(int argc, char **argv)
{
static const char permuser[3] = "ugo";
static const char permmode[3] = "rwx";
static const short int permmask[] = {
S_IRUSR, S_IWUSR, S_IXUSR,
S_IRGRP, S_IWGRP, S_IXGRP,
S_IROTH, S_IWOTH, S_IXOTH
};
char *ap;
mode_t mask;
int i;
int symbolic_mode = 0;
while (nextopt("S") != '\0') {
symbolic_mode = 1;
}
INTOFF;
mask = umask(0);
umask(mask);
INTON;
if ((ap = *argptr) == NULL) {
if (symbolic_mode) {
char buf[18];
char *p = buf;
for (i = 0; i < 3; i++) {
int j;
*p++ = permuser[i];
*p++ = '=';
for (j = 0; j < 3; j++) {
if ((mask & permmask[3 * i + j]) == 0) {
*p++ = permmode[j];
}
}
*p++ = ',';
}
*--p = 0;
puts(buf);
} else {
out1fmt("%.4o\n", mask);
}
} else {
if (is_digit((unsigned char) *ap)) {
mask = 0;
do {
if (*ap >= '8' || *ap < '0')
error(illnum, argv[1]);
mask = (mask << 3) + (*ap - '0');
} while (*++ap != '\0');
umask(mask);
} else {
mask = ~mask & 0777;
if (!bb_parse_mode(ap, &mask)) {
error("Illegal mode: %s", ap);
}
umask(~mask & 0777);
}
}
return 0;
}
/*
* ulimit builtin
*
* This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
* Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
* ash by J.T. Conklin.
*
* Public domain.
*/
struct limits {
const char *name;
int cmd;
int factor; /* multiply by to get rlim_{cur,max} values */
char option;
};
static const struct limits limits[] = {
#ifdef RLIMIT_CPU
{ "time(seconds)", RLIMIT_CPU, 1, 't' },
#endif
#ifdef RLIMIT_FSIZE
{ "file(blocks)", RLIMIT_FSIZE, 512, 'f' },
#endif
#ifdef RLIMIT_DATA
{ "data(kbytes)", RLIMIT_DATA, 1024, 'd' },
#endif
#ifdef RLIMIT_STACK
{ "stack(kbytes)", RLIMIT_STACK, 1024, 's' },
#endif
#ifdef RLIMIT_CORE
{ "coredump(blocks)", RLIMIT_CORE, 512, 'c' },
#endif
#ifdef RLIMIT_RSS
{ "memory(kbytes)", RLIMIT_RSS, 1024, 'm' },
#endif
#ifdef RLIMIT_MEMLOCK
{ "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' },
#endif
#ifdef RLIMIT_NPROC
{ "process(processes)", RLIMIT_NPROC, 1, 'p' },
#endif
#ifdef RLIMIT_NOFILE
{ "nofiles(descriptors)", RLIMIT_NOFILE, 1, 'n' },
#endif
#ifdef RLIMIT_VMEM
{ "vmemory(kbytes)", RLIMIT_VMEM, 1024, 'v' },
#endif
#ifdef RLIMIT_SWAP
{ "swap(kbytes)", RLIMIT_SWAP, 1024, 'w' },
#endif
{ (char *) 0, 0, 0, '\0' }
};
int
ulimitcmd(int argc, char **argv)
{
int c;
rlim_t val = 0;
enum { SOFT = 0x1, HARD = 0x2 }
how = SOFT | HARD;
const struct limits *l;
int set, all = 0;
int optc, what;
struct rlimit limit;
what = 'f';
while ((optc = nextopt("HSatfdsmcnpl")) != '\0')
switch (optc) {
case 'H':
how = HARD;
break;
case 'S':
how = SOFT;
break;
case 'a':
all = 1;
break;
default:
what = optc;
}
for (l = limits; l->name && l->option != what; l++)
;
if (!l->name)
error("internal error (%c)", what);
set = *argptr ? 1 : 0;
if (set) {
char *p = *argptr;
if (all || argptr[1])
error("too many arguments");
if (strncmp(p, "unlimited\n", 9) == 0)
val = RLIM_INFINITY;
else {
val = (rlim_t) 0;
while ((c = *p++) >= '0' && c <= '9')
{
val = (val * 10) + (long)(c - '0');
if (val < (rlim_t) 0)
break;
}
if (c)
error("bad number");
val *= l->factor;
}
}
if (all) {
for (l = limits; l->name; l++) {
getrlimit(l->cmd, &limit);
if (how & SOFT)
val = limit.rlim_cur;
else if (how & HARD)
val = limit.rlim_max;
out1fmt("%-20s ", l->name);
if (val == RLIM_INFINITY)
out1fmt("unlimited\n");
else
{
val /= l->factor;
out1fmt("%lld\n", (long long) val);
}
}
return 0;
}
getrlimit(l->cmd, &limit);
if (set) {
if (how & HARD)
limit.rlim_max = val;
if (how & SOFT)
limit.rlim_cur = val;
if (setrlimit(l->cmd, &limit) < 0)
error("error setting limit (%m)");
} else {
if (how & SOFT)
val = limit.rlim_cur;
else if (how & HARD)
val = limit.rlim_max;
if (val == RLIM_INFINITY)
out1fmt("unlimited\n");
else
{
val /= l->factor;
out1fmt("%lld\n", (long long) val);
}
}
return 0;
}
#ifdef DEBUG
const char *bb_applet_name = "debug stuff usage";
int main(int argc, char **argv)
{
return ash_main(argc, argv);
}
#endif
/*-
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
*
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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