emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
b01b4e2a1f
busybox/shell/msh.c
Denis Vlasenko 8e1c71529c Convert cmdedit into more generic line input facility 
(make history and completion optional at runtime).
Use it for fdisk, as an example.
Some unrelated fixes in fdisk are also here.
2007-01-22 07:21:38 +00:00

5309 lines
97 KiB
C
Raw Blame History

/* vi: set sw=4 ts=4: */
/*
* Minix shell port for busybox
*
* This version of the Minix shell was adapted for use in busybox
* by Erik Andersen <andersen@codepoet.org>
*
* - backtick expansion did not work properly
* Jonas Holmberg <jonas.holmberg@axis.com>
* Robert Schwebel <r.schwebel@pengutronix.de>
* Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
#include <setjmp.h>
#include <sys/times.h>
/*#define MSHDEBUG 1*/
#ifdef MSHDEBUG
int mshdbg = MSHDEBUG;
#define DBGPRINTF(x) if(mshdbg>0)printf x
#define DBGPRINTF0(x) if(mshdbg>0)printf x
#define DBGPRINTF1(x) if(mshdbg>1)printf x
#define DBGPRINTF2(x) if(mshdbg>2)printf x
#define DBGPRINTF3(x) if(mshdbg>3)printf x
#define DBGPRINTF4(x) if(mshdbg>4)printf x
#define DBGPRINTF5(x) if(mshdbg>5)printf x
#define DBGPRINTF6(x) if(mshdbg>6)printf x
#define DBGPRINTF7(x) if(mshdbg>7)printf x
#define DBGPRINTF8(x) if(mshdbg>8)printf x
#define DBGPRINTF9(x) if(mshdbg>9)printf x
int mshdbg_rc = 0;
#define RCPRINTF(x) if(mshdbg_rc)printf x
#else
#define DBGPRINTF(x)
#define DBGPRINTF0(x)
#define DBGPRINTF1(x)
#define DBGPRINTF2(x)
#define DBGPRINTF3(x)
#define DBGPRINTF4(x)
#define DBGPRINTF5(x)
#define DBGPRINTF6(x)
#define DBGPRINTF7(x)
#define DBGPRINTF8(x)
#define DBGPRINTF9(x)
#define RCPRINTF(x)
#endif /* MSHDEBUG */
#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
# define DEFAULT_ROOT_PROMPT "\\u:\\w> "
# define DEFAULT_USER_PROMPT "\\u:\\w$ "
#else
# define DEFAULT_ROOT_PROMPT "# "
# define DEFAULT_USER_PROMPT "$ "
#endif
/* -------- sh.h -------- */
/*
* shell
*/
#define LINELIM 2100
#define NPUSH 8 /* limit to input nesting */
#undef NOFILE
#define NOFILE 20 /* Number of open files */
#define NUFILE 10 /* Number of user-accessible files */
#define FDBASE 10 /* First file usable by Shell */
/*
* values returned by wait
*/
#define WAITSIG(s) ((s)&0177)
#define WAITVAL(s) (((s)>>8)&0377)
#define WAITCORE(s) (((s)&0200)!=0)
/*
* library and system definitions
*/
typedef void xint; /* base type of jmp_buf, for not broken compilers */
/*
* shell components
*/
#define QUOTE 0200
#define NOBLOCK ((struct op *)NULL)
#define NOWORD ((char *)NULL)
#define NOWORDS ((char **)NULL)
#define NOPIPE ((int *)NULL)
/*
* Description of a command or an operation on commands.
* Might eventually use a union.
*/
struct op {
int type; /* operation type, see below */
char **words; /* arguments to a command */
struct ioword **ioact; /* IO actions (eg, < > >>) */
struct op *left;
struct op *right;
char *str; /* identifier for case and for */
};
#define TCOM 1 /* command */
#define TPAREN 2 /* (c-list) */
#define TPIPE 3 /* a | b */
#define TLIST 4 /* a [&;] b */
#define TOR 5 /* || */
#define TAND 6 /* && */
#define TFOR 7
#define TDO 8
#define TCASE 9
#define TIF 10
#define TWHILE 11
#define TUNTIL 12
#define TELIF 13
#define TPAT 14 /* pattern in case */
#define TBRACE 15 /* {c-list} */
#define TASYNC 16 /* c & */
/* Added to support "." file expansion */
#define TDOT 17
/* Strings for names to make debug easier */
#ifdef MSHDEBUG
static const char *const T_CMD_NAMES[] = {
"PLACEHOLDER",
"TCOM",
"TPAREN",
"TPIPE",
"TLIST",
"TOR",
"TAND",
"TFOR",
"TDO",
"TCASE",
"TIF",
"TWHILE",
"TUNTIL",
"TELIF",
"TPAT",
"TBRACE",
"TASYNC",
"TDOT",
};
#endif
/*
* actions determining the environment of a process
*/
#define BIT(i) (1<<(i))
#define FEXEC BIT(0) /* execute without forking */
#define AREASIZE (90000)
/*
* flags to control evaluation of words
*/
#define DOSUB 1 /* interpret $, `, and quotes */
#define DOBLANK 2 /* perform blank interpretation */
#define DOGLOB 4 /* interpret [?* */
#define DOKEY 8 /* move words with `=' to 2nd arg. list */
#define DOTRIM 16 /* trim resulting string */
#define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
/* PROTOTYPES */
static int newfile(char *s);
static char *findeq(char *cp);
static char *cclass(char *p, int sub);
static void initarea(void);
extern int msh_main(int argc, char **argv);
struct brkcon {
jmp_buf brkpt;
struct brkcon *nextlev;
};
/*
* redirection
*/
struct ioword {
short io_unit; /* unit affected */
short io_flag; /* action (below) */
char *io_name; /* file name */
};
#define IOREAD 1 /* < */
#define IOHERE 2 /* << (here file) */
#define IOWRITE 4 /* > */
#define IOCAT 8 /* >> */
#define IOXHERE 16 /* ${}, ` in << */
#define IODUP 32 /* >&digit */
#define IOCLOSE 64 /* >&- */
#define IODEFAULT (-1) /* token for default IO unit */
/*
* parsing & execution environment
*/
static struct env {
char *linep;
struct io *iobase;
struct io *iop;
xint *errpt; /* void * */
int iofd;
struct env *oenv;
} e;
/*
* flags:
* -e: quit on error
* -k: look for name=value everywhere on command line
* -n: no execution
* -t: exit after reading and executing one command
* -v: echo as read
* -x: trace
* -u: unset variables net diagnostic
*/
static char flags['z' - 'a' + 1];
/* this looks weird, but is OK ... we index flag with 'a'...'z' */
static char *flag = flags - 'a';
static char *null; /* null value for variable */
static int intr; /* interrupt pending */
static char *trap[_NSIG + 1];
static char ourtrap[_NSIG + 1];
static int trapset; /* trap pending */
static int heedint; /* heed interrupt signals */
static int yynerrs; /* yacc */
static char line[LINELIM];
static char *elinep;
/*
* other functions
*/
static int (*inbuilt(char *s)) (struct op *);
static char *rexecve(char *c, char **v, char **envp);
static char *space(int n);
static char *strsave(char *s, int a);
static char *evalstr(char *cp, int f);
static char *putn(int n);
static char *unquote(char *as);
static struct var *lookup(char *n);
static int rlookup(char *n);
static struct wdblock *glob(char *cp, struct wdblock *wb);
static int my_getc(int ec);
static int subgetc(char ec, int quoted);
static char **makenv(int all, struct wdblock *wb);
static char **eval(char **ap, int f);
static int setstatus(int s);
static int waitfor(int lastpid, int canintr);
static void onintr(int s); /* SIGINT handler */
static int newenv(int f);
static void quitenv(void);
static void err(char *s);
static int anys(char *s1, char *s2);
static int any(int c, char *s);
static void next(int f);
static void setdash(void);
static void onecommand(void);
static void runtrap(int i);
static int gmatch(char *s, char *p);
/*
* error handling
*/
static void leave(void); /* abort shell (or fail in subshell) */
static void fail(void); /* fail but return to process next command */
static void warn(char *s);
static void sig(int i); /* default signal handler */
/* -------- area stuff -------- */
#define REGSIZE sizeof(struct region)
#define GROWBY (256)
/* #define SHRINKBY (64) */
#undef SHRINKBY
#define FREE (32767)
#define BUSY (0)
#define ALIGN (sizeof(int)-1)
struct region {
struct region *next;
int area;
};
/* -------- grammar stuff -------- */
typedef union {
char *cp;
char **wp;
int i;
struct op *o;
} YYSTYPE;
#define WORD 256
#define LOGAND 257
#define LOGOR 258
#define BREAK 259
#define IF 260
#define THEN 261
#define ELSE 262
#define ELIF 263
#define FI 264
#define CASE 265
#define ESAC 266
#define FOR 267
#define WHILE 268
#define UNTIL 269
#define DO 270
#define DONE 271
#define IN 272
/* Added for "." file expansion */
#define DOT 273
#define YYERRCODE 300
/* flags to yylex */
#define CONTIN 01 /* skip new lines to complete command */
#define SYNTAXERR zzerr()
static struct op *pipeline(int cf);
static struct op *andor(void);
static struct op *c_list(void);
static int synio(int cf);
static void musthave(int c, int cf);
static struct op *simple(void);
static struct op *nested(int type, int mark);
static struct op *command(int cf);
static struct op *dogroup(int onlydone);
static struct op *thenpart(void);
static struct op *elsepart(void);
static struct op *caselist(void);
static struct op *casepart(void);
static char **pattern(void);
static char **wordlist(void);
static struct op *list(struct op *t1, struct op *t2);
static struct op *block(int type, struct op *t1, struct op *t2, char **wp);
static struct op *newtp(void);
static struct op *namelist(struct op *t);
static char **copyw(void);
static void word(char *cp);
static struct ioword **copyio(void);
static struct ioword *io(int u, int f, char *cp);
static void zzerr(void);
static void yyerror(char *s);
static int yylex(int cf);
static int collect(int c, int c1);
static int dual(int c);
static void diag(int ec);
static char *tree(unsigned size);
/* -------- var.h -------- */
struct var {
char *value;
char *name;
struct var *next;
char status;
};
#define COPYV 1 /* flag to setval, suggesting copy */
#define RONLY 01 /* variable is read-only */
#define EXPORT 02 /* variable is to be exported */
#define GETCELL 04 /* name & value space was got with getcell */
static int yyparse(void);
static struct var *lookup(char *n);
static void setval(struct var *vp, char *val);
static void nameval(struct var *vp, char *val, char *name);
static void export(struct var *vp);
static void ronly(struct var *vp);
static int isassign(char *s);
static int checkname(char *cp);
static int assign(char *s, int cf);
static void putvlist(int f, int out);
static int eqname(char *n1, char *n2);
static int execute(struct op *t, int *pin, int *pout, int act);
/* -------- io.h -------- */
/* io buffer */
struct iobuf {
unsigned id; /* buffer id */
char buf[512]; /* buffer */
char *bufp; /* pointer into buffer */
char *ebufp; /* pointer to end of buffer */
};
/* possible arguments to an IO function */
struct ioarg {
char *aword;
char **awordlist;
int afile; /* file descriptor */
unsigned afid; /* buffer id */
long afpos; /* file position */
struct iobuf *afbuf; /* buffer for this file */
};
//static struct ioarg ioargstack[NPUSH];
#define AFID_NOBUF (~0)
#define AFID_ID 0
/* an input generator's state */
struct io {
int (*iofn) (struct ioarg *, struct io *);
struct ioarg *argp;
int peekc;
char prev; /* previous character read by readc() */
char nlcount; /* for `'s */
char xchar; /* for `'s */
char task; /* reason for pushed IO */
};
//static struct io iostack[NPUSH];
#define XOTHER 0 /* none of the below */
#define XDOLL 1 /* expanding ${} */
#define XGRAVE 2 /* expanding `'s */
#define XIO 3 /* file IO */
/* in substitution */
#define INSUB() (e.iop->task == XGRAVE || e.iop->task == XDOLL)
/*
* input generators for IO structure
*/
static int nlchar(struct ioarg *ap);
static int strchar(struct ioarg *ap);
static int qstrchar(struct ioarg *ap);
static int filechar(struct ioarg *ap);
static int herechar(struct ioarg *ap);
static int linechar(struct ioarg *ap);
static int gravechar(struct ioarg *ap, struct io *iop);
static int qgravechar(struct ioarg *ap, struct io *iop);
static int dolchar(struct ioarg *ap);
static int wdchar(struct ioarg *ap);
static void scraphere(void);
static void freehere(int area);
static void gethere(void);
static void markhere(char *s, struct ioword *iop);
static int herein(char *hname, int xdoll);
static int run(struct ioarg *argp, int (*f) (struct ioarg *));
/*
* IO functions
*/
static int eofc(void);
static int readc(void);
static void unget(int c);
static void ioecho(char c);
static void prs(const char *s);
static void prn(unsigned u);
static void closef(int i);
static void closeall(void);
/*
* IO control
*/
static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
static int remap(int fd);
static int openpipe(int *pv);
static void closepipe(int *pv);
static struct io *setbase(struct io *ip);
#define PUSHIO(what,arg,gen) ((temparg.what = (arg)),pushio(&temparg,(gen)))
#define RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen)))
/* -------- word.h -------- */
#define NSTART 16 /* default number of words to allow for initially */
struct wdblock {
short w_bsize;
short w_nword;
/* bounds are arbitrary */
char *w_words[1];
};
static struct wdblock *addword(char *wd, struct wdblock *wb);
static struct wdblock *newword(int nw);
static char **getwords(struct wdblock *wb);
/* -------- area.h -------- */
/*
* storage allocation
*/
static char *getcell(unsigned nbytes);
static void garbage(void);
static void setarea(char *cp, int a);
static int getarea(char *cp);
static void freearea(int a);
static void freecell(char *cp);
static int areanum; /* current allocation area */
#define NEW(type) (type *)getcell(sizeof(type))
#define DELETE(obj) freecell((char *)obj)
/* -------- misc stuff -------- */
static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp);
static int iosetup(struct ioword *iop, int pipein, int pipeout);
static void echo(char **wp);
static struct op **find1case(struct op *t, char *w);
static struct op *findcase(struct op *t, char *w);
static void brkset(struct brkcon *bc);
static int dolabel(struct op *t);
static int dohelp(struct op *t);
static int dochdir(struct op *t);
static int doshift(struct op *t);
static int dologin(struct op *t);
static int doumask(struct op *t);
static int doexec(struct op *t);
static int dodot(struct op *t);
static int dowait(struct op *t);
static int doread(struct op *t);
static int doeval(struct op *t);
static int dotrap(struct op *t);
static int getsig(char *s);
static void setsig(int n, sighandler_t f);
static int getn(char *as);
static int dobreak(struct op *t);
static int docontinue(struct op *t);
static int brkcontin(char *cp, int val);
static int doexit(struct op *t);
static int doexport(struct op *t);
static int doreadonly(struct op *t);
static void rdexp(char **wp, void (*f) (struct var *), int key);
static void badid(char *s);
static int doset(struct op *t);
static void varput(char *s, int out);
static int dotimes(struct op *t);
static int expand(char *cp, struct wdblock **wbp, int f);
static char *blank(int f);
static int dollar(int quoted);
static int grave(int quoted);
static void globname(char *we, char *pp);
static char *generate(char *start1, char *end1, char *middle, char *end);
static int anyspcl(struct wdblock *wb);
static int xstrcmp(char *p1, char *p2);
static void glob0(char *a0, unsigned int a1, int a2,
int (*a3) (char *, char *));
static void glob1(char *base, char *lim);
static void glob2(char *i, char *j);
static void glob3(char *i, char *j, char *k);
static void readhere(char **name, char *s, int ec);
static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
static int xxchar(struct ioarg *ap);
struct here {
char *h_tag;
int h_dosub;
struct ioword *h_iop;
struct here *h_next;
};
static const char * const signame[] = {
"Signal 0",
"Hangup",
(char *) NULL, /* interrupt */
"Quit",
"Illegal instruction",
"Trace/BPT trap",
"Abort",
"Bus error",
"Floating Point Exception",
"Killed",
"SIGUSR1",
"SIGSEGV",
"SIGUSR2",
(char *) NULL, /* broken pipe */
"Alarm clock",
"Terminated",
};
#define NSIGNAL (sizeof(signame)/sizeof(signame[0]))
struct res {
const char *r_name;
int r_val;
};
static const struct res restab[] = {
{"for", FOR},
{"case", CASE},
{"esac", ESAC},
{"while", WHILE},
{"do", DO},
{"done", DONE},
{"if", IF},
{"in", IN},
{"then", THEN},
{"else", ELSE},
{"elif", ELIF},
{"until", UNTIL},
{"fi", FI},
{";;", BREAK},
{"||", LOGOR},
{"&&", LOGAND},
{"{", '{'},
{"}", '}'},
{".", DOT},
{0, 0},
};
struct builtincmd {
const char *name;
int (*builtinfunc) (struct op * t);
};
static const struct builtincmd builtincmds[] = {
{".", dodot},
{":", dolabel},
{"break", dobreak},
{"cd", dochdir},
{"continue", docontinue},
{"eval", doeval},
{"exec", doexec},
{"exit", doexit},
{"export", doexport},
{"help", dohelp},
{"login", dologin},
{"newgrp", dologin},
{"read", doread},
{"readonly", doreadonly},
{"set", doset},
{"shift", doshift},
{"times", dotimes},
{"trap", dotrap},
{"umask", doumask},
{"wait", dowait},
{0, 0}
};
static struct op *scantree(struct op *);
static struct op *dowholefile(int, int);
/* Globals */
extern char **environ; /* environment pointer */
static char **dolv;
static int dolc;
static int exstat;
static char gflg;
static int interactive; /* Is this an interactive shell */
static int execflg;
static int multiline; /* \n changed to ; */
static struct op *outtree; /* result from parser */
static xint *failpt;
static xint *errpt;
static struct brkcon *brklist;
static int isbreak;
static struct wdblock *wdlist;
static struct wdblock *iolist;
static char *trap[_NSIG + 1];
static char ourtrap[_NSIG + 1];
static int trapset; /* trap pending */
#ifdef MSHDEBUG
static struct var *mshdbg_var;
#endif
static struct var *vlist; /* dictionary */
static struct var *homedir; /* home directory */
static struct var *prompt; /* main prompt */
static struct var *cprompt; /* continuation prompt */
static struct var *path; /* search path for commands */
static struct var *shell; /* shell to interpret command files */
static struct var *ifs; /* field separators */
static int areanum; /* current allocation area */
static int intr;
static int inparse;
static char *null = "";
static int heedint = 1;
static void (*qflag) (int) = SIG_IGN;
static int startl;
static int peeksym;
static int nlseen;
static int iounit = IODEFAULT;
static YYSTYPE yylval;
static char *elinep = line + sizeof(line) - 5;
static struct ioarg temparg = { 0, 0, 0, AFID_NOBUF, 0 }; /* temporary for PUSHIO */
static struct ioarg ioargstack[NPUSH];
static struct io iostack[NPUSH];
static struct iobuf sharedbuf = { AFID_NOBUF };
static struct iobuf mainbuf = { AFID_NOBUF };
static unsigned bufid = AFID_ID; /* buffer id counter */
static struct here *inhere; /* list of hear docs while parsing */
static struct here *acthere; /* list of active here documents */
static struct region *areabot; /* bottom of area */
static struct region *areatop; /* top of area */
static struct region *areanxt; /* starting point of scan */
static void *brktop;
static void *brkaddr;
static struct env e = {
line, /* linep: char ptr */
iostack, /* iobase: struct io ptr */
iostack - 1, /* iop: struct io ptr */
(xint *) NULL, /* errpt: void ptr for errors? */
FDBASE, /* iofd: file desc */
(struct env *) NULL /* oenv: struct env ptr */
};
#ifdef MSHDEBUG
void print_t(struct op *t)
{
DBGPRINTF(("T: t=%p, type %s, words=%p, IOword=%p\n", t,
T_CMD_NAMES[t->type], t->words, t->ioact));
if (t->words) {
DBGPRINTF(("T: W1: %s", t->words[0]));
}
return;
}
void print_tree(struct op *head)
{
if (head == NULL) {
DBGPRINTF(("PRINT_TREE: no tree\n"));
return;
}
DBGPRINTF(("NODE: %p, left %p, right %p\n", head, head->left,
head->right));
if (head->left)
print_tree(head->left);
if (head->right)
print_tree(head->right);
return;
}
#endif /* MSHDEBUG */
#if ENABLE_FEATURE_COMMAND_EDITING
static char *current_prompt;
#endif
/* -------- sh.c -------- */
/*
* shell
*/
#if ENABLE_FEATURE_COMMAND_EDITING
static line_input_t *line_input_state;
#endif
int msh_main(int argc, char **argv)
{
int f;
char *s;
int cflag;
char *name, **ap;
int (*iof) (struct ioarg *);
#if ENABLE_FEATURE_COMMAND_EDITING
line_input_state = new_line_input_t(FOR_SHELL);
#endif
DBGPRINTF(("MSH_MAIN: argc %d, environ %p\n", argc, environ));
initarea();
ap = environ;
if (ap != NULL) {
while (*ap)
assign(*ap++, !COPYV);
for (ap = environ; *ap;)
export(lookup(*ap++));
}
closeall();
areanum = 1;
shell = lookup("SHELL");
if (shell->value == null)
setval(shell, (char *)DEFAULT_SHELL);
export(shell);
homedir = lookup("HOME");
if (homedir->value == null)
setval(homedir, "/");
export(homedir);
setval(lookup("$"), putn(getpid()));
path = lookup("PATH");
if (path->value == null) {
if (geteuid() == 0)
setval(path, "/sbin:/bin:/usr/sbin:/usr/bin");
else
setval(path, "/bin:/usr/bin");
}
export(path);
ifs = lookup("IFS");
if (ifs->value == null)
setval(ifs, " \t\n");
#ifdef MSHDEBUG
mshdbg_var = lookup("MSHDEBUG");
if (mshdbg_var->value == null)
setval(mshdbg_var, "0");
#endif
prompt = lookup("PS1");
#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
if (prompt->value == null)
#endif
setval(prompt, DEFAULT_USER_PROMPT);
if (geteuid() == 0) {
setval(prompt, DEFAULT_ROOT_PROMPT);
prompt->status &= ~EXPORT;
}
cprompt = lookup("PS2");
#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
if (cprompt->value == null)
#endif
setval(cprompt, "> ");
iof = filechar;
cflag = 0;
name = *argv++;
if (--argc >= 1) {
if (argv[0][0] == '-' && argv[0][1] != '\0') {
for (s = argv[0] + 1; *s; s++)
switch (*s) {
case 'c':
prompt->status &= ~EXPORT;
cprompt->status &= ~EXPORT;
setval(prompt, "");
setval(cprompt, "");
cflag = 1;
if (--argc > 0)
PUSHIO(aword, *++argv, iof = nlchar);
break;
case 'q':
qflag = SIG_DFL;
break;
case 's':
/* standard input */
break;
case 't':
prompt->status &= ~EXPORT;
setval(prompt, "");
iof = linechar;
break;
case 'i':
interactive++;
default:
if (*s >= 'a' && *s <= 'z')
flag[(int) *s]++;
}
} else {
argv--;
argc++;
}
if (iof == filechar && --argc > 0) {
setval(prompt, "");
setval(cprompt, "");
prompt->status &= ~EXPORT;
cprompt->status &= ~EXPORT;
/* Shell is non-interactive, activate printf-based debug */
#ifdef MSHDEBUG
mshdbg = (int) (((char) (mshdbg_var->value[0])) - '0');
if (mshdbg < 0)
mshdbg = 0;
#endif
DBGPRINTF(("MSH_MAIN: calling newfile()\n"));
if (newfile(name = *++argv))
exit(1); /* Exit on error */
}
}
setdash();
/* This won't be true if PUSHIO has been called, say from newfile() above */
if (e.iop < iostack) {
PUSHIO(afile, 0, iof);
if (isatty(0) && isatty(1) && !cflag) {
interactive++;
#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
#ifdef MSHDEBUG
printf("\n\n%s Built-in shell (msh with debug)\n", BB_BANNER);
#else
printf("\n\n%s Built-in shell (msh)\n", BB_BANNER);
#endif
printf("Enter 'help' for a list of built-in commands.\n\n");
#endif
}
}
signal(SIGQUIT, qflag);
if (name && name[0] == '-') {
interactive++;
if ((f = open(".profile", 0)) >= 0)
next(remap(f));
if ((f = open("/etc/profile", 0)) >= 0)
next(remap(f));
}
if (interactive)
signal(SIGTERM, sig);
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, onintr);
dolv = argv;
dolc = argc;
dolv[0] = name;
if (dolc > 1) {
for (ap = ++argv; --argc > 0;) {
if (assign(*ap = *argv++, !COPYV)) {
dolc--; /* keyword */
} else {
ap++;
}
}
}
setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, e.iop %p, iostack %p\n", interactive, e.iop, iostack));
for (;;) {
if (interactive && e.iop <= iostack) {
#if ENABLE_FEATURE_COMMAND_EDITING
current_prompt = prompt->value;
#else
prs(prompt->value);
#endif
}
onecommand();
/* Ensure that getenv("PATH") stays current */
setenv("PATH", path->value, 1);
}
DBGPRINTF(("MSH_MAIN: returning.\n"));
}
static void setdash(void)
{
char *cp;
int c;
char m['z' - 'a' + 1];
cp = m;
for (c = 'a'; c <= 'z'; c++)
if (flag[c])
*cp++ = c;
*cp = 0;
setval(lookup("-"), m);
}
static int newfile(char *s)
{
int f;
DBGPRINTF7(("NEWFILE: opening %s\n", s));
if (NOT_LONE_DASH(s)) {
DBGPRINTF(("NEWFILE: s is %s\n", s));
f = open(s, 0);
if (f < 0) {
prs(s);
err(": cannot open");
return 1;
}
} else
f = 0;
next(remap(f));
return 0;
}
struct op *scantree(struct op *head)
{
struct op *dotnode;
if (head == NULL)
return NULL;
if (head->left != NULL) {
dotnode = scantree(head->left);
if (dotnode)
return dotnode;
}
if (head->right != NULL) {
dotnode = scantree(head->right);
if (dotnode)
return dotnode;
}
if (head->words == NULL)
return NULL;
DBGPRINTF5(("SCANTREE: checking node %p\n", head));
if ((head->type != TDOT) && (strcmp(".", head->words[0]) == 0)) {
DBGPRINTF5(("SCANTREE: dot found in node %p\n", head));
return head;
}
return NULL;
}
static void onecommand(void)
{
int i;
jmp_buf m1;
DBGPRINTF(("ONECOMMAND: enter, outtree=%p\n", outtree));
while (e.oenv)
quitenv();
areanum = 1;
freehere(areanum);
freearea(areanum);
garbage();
wdlist = 0;
iolist = 0;
e.errpt = 0;
e.linep = line;
yynerrs = 0;
multiline = 0;
inparse = 1;
intr = 0;
execflg = 0;
setjmp(failpt = m1); /* Bruce Evans' fix */
if (setjmp(failpt = m1) || yyparse() || intr) {
DBGPRINTF(("ONECOMMAND: this is not good.\n"));
while (e.oenv)
quitenv();
scraphere();
if (!interactive && intr)
leave();
inparse = 0;
intr = 0;
return;
}
inparse = 0;
brklist = 0;
intr = 0;
execflg = 0;
if (!flag['n']) {
DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=%p\n",
outtree));
execute(outtree, NOPIPE, NOPIPE, 0);
}
if (!interactive && intr) {
execflg = 0;
leave();
}
i = trapset;
if (i != 0) {
trapset = 0;
runtrap(i);
}
}
static void fail(void)
{
longjmp(failpt, 1);
/* NOTREACHED */
}
static void leave(void)
{
DBGPRINTF(("LEAVE: leave called!\n"));
if (execflg)
fail();
scraphere();
freehere(1);
runtrap(0);
_exit(exstat);
/* NOTREACHED */
}
static void warn(char *s)
{
if (*s) {
prs(s);
exstat = -1;
}
prs("\n");
if (flag['e'])
leave();
}
static void err(char *s)
{
warn(s);
if (flag['n'])
return;
if (!interactive)
leave();
if (e.errpt)
longjmp(e.errpt, 1);
closeall();
e.iop = e.iobase = iostack;
}
static int newenv(int f)
{
struct env *ep;
DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f));
if (f) {
quitenv();
return 1;
}
ep = (struct env *) space(sizeof(*ep));
if (ep == NULL) {
while (e.oenv)
quitenv();
fail();
}
*ep = e;
e.oenv = ep;
e.errpt = errpt;
return 0;
}
static void quitenv(void)
{
struct env *ep;
int fd;
DBGPRINTF(("QUITENV: e.oenv=%p\n", e.oenv));
ep = e.oenv;
if (ep != NULL) {
fd = e.iofd;
e = *ep;
/* should close `'d files */
DELETE(ep);
while (--fd >= e.iofd)
close(fd);
}
}
/*
* Is any character from s1 in s2?
*/
static int anys(char *s1, char *s2)
{
while (*s1)
if (any(*s1++, s2))
return 1;
return 0;
}
/*
* Is character c in s?
*/
static int any(int c, char *s)
{
while (*s)
if (*s++ == c)
return 1;
return 0;
}
static char *putn(int n)
{
return itoa(n);
}
static void next(int f)
{
PUSHIO(afile, f, filechar);
}
static void onintr(int s) /* ANSI C requires a parameter */
{
signal(SIGINT, onintr);
intr = 1;
if (interactive) {
if (inparse) {
prs("\n");
fail();
}
} else if (heedint) {
execflg = 0;
leave();
}
}
static char *space(int n)
{
char *cp;
cp = getcell(n);
if (cp == 0)
err("out of string space");
return cp;
}
static char *strsave(char *s, int a)
{
char *cp;
cp = space(strlen(s) + 1);
if (cp != NULL) {
setarea(cp, a);
strcpy(cp, s);
return cp;
}
return "";
}
/*
* trap handling
*/
static void sig(int i)
{
trapset = i;
signal(i, sig);
}
static void runtrap(int i)
{
char *trapstr;
trapstr = trap[i];
if (trapstr == NULL)
return;
if (i == 0)
trap[i] = 0;
RUN(aword, trapstr, nlchar);
}
/* -------- var.c -------- */
/*
* Find the given name in the dictionary
* and return its value. If the name was
* not previously there, enter it now and
* return a null value.
*/
static struct var *lookup(char *n)
{
struct var *vp;
char *cp;
int c;
static struct var dummy;
if (isdigit(*n)) {
dummy.name = n;
for (c = 0; isdigit(*n) && c < 1000; n++)
c = c * 10 + *n - '0';
dummy.status = RONLY;
dummy.value = c <= dolc ? dolv[c] : null;
return &dummy;
}
for (vp = vlist; vp; vp = vp->next)
if (eqname(vp->name, n))
return vp;
cp = findeq(n);
vp = (struct var *) space(sizeof(*vp));
if (vp == 0 || (vp->name = space((int) (cp - n) + 2)) == 0) {
dummy.name = dummy.value = "";
return &dummy;
}
for (cp = vp->name; (*cp = *n++) && *cp != '='; cp++);
if (*cp == 0)
*cp = '=';
*++cp = 0;
setarea((char *) vp, 0);
setarea((char *) vp->name, 0);
vp->value = null;
vp->next = vlist;
vp->status = GETCELL;
vlist = vp;
return vp;
}
/*
* give variable at `vp' the value `val'.
*/
static void setval(struct var *vp, char *val)
{
nameval(vp, val, (char *) NULL);
}
/*
* if name is not NULL, it must be
* a prefix of the space `val',
* and end with `='.
* this is all so that exporting
* values is reasonably painless.
*/
static void nameval(struct var *vp, char *val, char *name)
{
char *cp, *xp;
char *nv;
int fl;
if (vp->status & RONLY) {
for (xp = vp->name; *xp && *xp != '=';)
putc(*xp++, stderr);
err(" is read-only");
return;
}
fl = 0;
if (name == NULL) {
xp = space(strlen(vp->name) + strlen(val) + 2);
if (xp == 0)
return;
/* make string: name=value */
setarea((char *) xp, 0);
name = xp;
for (cp = vp->name; (*xp = *cp++) && *xp != '='; xp++);
if (*xp++ == 0)
xp[-1] = '=';
nv = xp;
for (cp = val; (*xp++ = *cp++) != '\0';);
val = nv;
fl = GETCELL;
}
if (vp->status & GETCELL)
freecell(vp->name); /* form new string `name=value' */
vp->name = name;
vp->value = val;
vp->status |= fl;
}
static void export(struct var *vp)
{
vp->status |= EXPORT;
}
static void ronly(struct var *vp)
{
if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */
vp->status |= RONLY;
}
static int isassign(char *s)
{
DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
if (!isalpha((int) *s) && *s != '_')
return 0;
for (; *s != '='; s++)
if (*s == 0 || (!isalnum(*s) && *s != '_'))
return 0;
return 1;
}
static int assign(char *s, int cf)
{
char *cp;
struct var *vp;
DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf));
if (!isalpha(*s) && *s != '_')
return 0;
for (cp = s; *cp != '='; cp++)
if (*cp == 0 || (!isalnum(*cp) && *cp != '_'))
return 0;
vp = lookup(s);
nameval(vp, ++cp, cf == COPYV ? (char *) NULL : s);
if (cf != COPYV)
vp->status &= ~GETCELL;
return 1;
}
static int checkname(char *cp)
{
DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp));
if (!isalpha(*cp++) && *(cp - 1) != '_')
return 0;
while (*cp)
if (!isalnum(*cp++) && *(cp - 1) != '_')
return 0;
return 1;
}
static void putvlist(int f, int out)
{
struct var *vp;
for (vp = vlist; vp; vp = vp->next)
if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) {
if (vp->status & EXPORT)
write(out, "export ", 7);
if (vp->status & RONLY)
write(out, "readonly ", 9);
write(out, vp->name, (int) (findeq(vp->name) - vp->name));
write(out, "\n", 1);
}
}
static int eqname(char *n1, char *n2)
{
for (; *n1 != '=' && *n1 != 0; n1++)
if (*n2++ != *n1)
return 0;
return *n2 == 0 || *n2 == '=';
}
static char *findeq(char *cp)
{
while (*cp != '\0' && *cp != '=')
cp++;
return cp;
}
/* -------- gmatch.c -------- */
/*
* int gmatch(string, pattern)
* char *string, *pattern;
*
* Match a pattern as in sh(1).
*/
#define CMASK 0377
#define QUOTE 0200
#define QMASK (CMASK&~QUOTE)
#define NOT '!' /* might use ^ */
static int gmatch(char *s, char *p)
{
int sc, pc;
if (s == NULL || p == NULL)
return 0;
while ((pc = *p++ & CMASK) != '\0') {
sc = *s++ & QMASK;
switch (pc) {
case '[':
p = cclass(p, sc);
if (p == NULL)
return 0;
break;
case '?':
if (sc == 0)
return 0;
break;
case '*':
s--;
do {
if (*p == '\0' || gmatch(s, p))
return 1;
} while (*s++ != '\0');
return 0;
default:
if (sc != (pc & ~QUOTE))
return 0;
}
}
return *s == 0;
}
static char *cclass(char *p, int sub)
{
int c, d, not, found;
if ((not = *p == NOT) != 0)
p++;
found = not;
do {
if (*p == '\0')
return NULL;
c = *p & CMASK;
if (p[1] == '-' && p[2] != ']') {
d = p[2] & CMASK;
p++;
} else
d = c;
if (c == sub || (c <= sub && sub <= d))
found = !not;
} while (*++p != ']');
return found ? p + 1 : NULL;
}
/* -------- area.c -------- */
/*
* All memory between (char *)areabot and (char *)(areatop+1) is
* exclusively administered by the area management routines.
* It is assumed that sbrk() and brk() manipulate the high end.
*/
#define sbrk(X) ({ void * __q = (void *)-1; if (brkaddr + (int)(X) < brktop) { __q = brkaddr; brkaddr+=(int)(X); } __q;})
static void initarea(void)
{
brkaddr = xmalloc(AREASIZE);
brktop = brkaddr + AREASIZE;
while ((long) sbrk(0) & ALIGN)
sbrk(1);
areabot = (struct region *) sbrk(REGSIZE);
areabot->next = areabot;
areabot->area = BUSY;
areatop = areabot;
areanxt = areabot;
}
char *getcell(unsigned nbytes)
{
int nregio;
struct region *p, *q;
int i;
if (nbytes == 0) {
puts("getcell(0)");
abort();
}
/* silly and defeats the algorithm */
/*
* round upwards and add administration area
*/
nregio = (nbytes + (REGSIZE - 1)) / REGSIZE + 1;
for (p = areanxt;;) {
if (p->area > areanum) {
/*
* merge free cells
*/
while ((q = p->next)->area > areanum && q != areanxt)
p->next = q->next;
/*
* exit loop if cell big enough
*/
if (q >= p + nregio)
goto found;
}
p = p->next;
if (p == areanxt)
break;
}
i = nregio >= GROWBY ? nregio : GROWBY;
p = (struct region *) sbrk(i * REGSIZE);
if (p == (struct region *) -1)
return NULL;
p--;
if (p != areatop) {
puts("not contig");
abort(); /* allocated areas are contiguous */
}
q = p + i;
p->next = q;
p->area = FREE;
q->next = areabot;
q->area = BUSY;
areatop = q;
found:
/*
* we found a FREE area big enough, pointed to by 'p', and up to 'q'
*/
areanxt = p + nregio;
if (areanxt < q) {
/*
* split into requested area and rest
*/
if (areanxt + 1 > q) {
puts("OOM");
abort(); /* insufficient space left for admin */
}
areanxt->next = q;
areanxt->area = FREE;
p->next = areanxt;
}
p->area = areanum;
return (char *) (p + 1);
}
static void freecell(char *cp)
{
struct region *p;
p = (struct region *) cp;
if (p != NULL) {
p--;
if (p < areanxt)
areanxt = p;
p->area = FREE;
}
}
static void freearea(int a)
{
struct region *p, *top;
top = areatop;
for (p = areabot; p != top; p = p->next)
if (p->area >= a)
p->area = FREE;
}
static void setarea(char *cp, int a)
{
struct region *p;
if ((p = (struct region *) cp) != NULL)
(p - 1)->area = a;
}
int getarea(char *cp)
{
return ((struct region *) cp - 1)->area;
}
static void garbage(void)
{
struct region *p, *q, *top;
top = areatop;
for (p = areabot; p != top; p = p->next) {
if (p->area > areanum) {
while ((q = p->next)->area > areanum)
p->next = q->next;
areanxt = p;
}
}
#ifdef SHRINKBY
if (areatop >= q + SHRINKBY && q->area > areanum) {
brk((char *) (q + 1));
q->next = areabot;
q->area = BUSY;
areatop = q;
}
#endif
}
/* -------- csyn.c -------- */
/*
* shell: syntax (C version)
*/
int yyparse(void)
{
DBGPRINTF7(("YYPARSE: enter...\n"));
startl = 1;
peeksym = 0;
yynerrs = 0;
outtree = c_list();
musthave('\n', 0);
return (yynerrs != 0);
}
static struct op *pipeline(int cf)
{
struct op *t, *p;
int c;
DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf));
t = command(cf);
DBGPRINTF9(("PIPELINE: t=%p\n", t));
if (t != NULL) {
while ((c = yylex(0)) == '|') {
p = command(CONTIN);
if (p == NULL) {
DBGPRINTF8(("PIPELINE: error!\n"));
SYNTAXERR;
}
if (t->type != TPAREN && t->type != TCOM) {
/* shell statement */
t = block(TPAREN, t, NOBLOCK, NOWORDS);
}
t = block(TPIPE, t, p, NOWORDS);
}
peeksym = c;
}
DBGPRINTF7(("PIPELINE: returning t=%p\n", t));
return t;
}
static struct op *andor(void)
{
struct op *t, *p;
int c;
DBGPRINTF7(("ANDOR: enter...\n"));
t = pipeline(0);
DBGPRINTF9(("ANDOR: t=%p\n", t));
if (t != NULL) {
while ((c = yylex(0)) == LOGAND || c == LOGOR) {
p = pipeline(CONTIN);
if (p == NULL) {
DBGPRINTF8(("ANDOR: error!\n"));
SYNTAXERR;
}
t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS);
} /* WHILE */
peeksym = c;
}
DBGPRINTF7(("ANDOR: returning t=%p\n", t));
return t;
}
static struct op *c_list(void)
{
struct op *t, *p;
int c;
DBGPRINTF7(("C_LIST: enter...\n"));
t = andor();
if (t != NULL) {
peeksym = yylex(0);
if (peeksym == '&')
t = block(TASYNC, t, NOBLOCK, NOWORDS);
while ((c = yylex(0)) == ';' || c == '&'
|| (multiline && c == '\n')) {
p = andor();
if (p== NULL)
return t;
peeksym = yylex(0);
if (peeksym == '&')
p = block(TASYNC, p, NOBLOCK, NOWORDS);
t = list(t, p);
} /* WHILE */
peeksym = c;
}
/* IF */
DBGPRINTF7(("C_LIST: returning t=%p\n", t));
return t;
}
static int synio(int cf)
{
struct ioword *iop;
int i;
int c;
DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf));
c = yylex(cf);
if (c != '<' && c != '>') {
peeksym = c;
return 0;
}
i = yylval.i;
musthave(WORD, 0);
iop = io(iounit, i, yylval.cp);
iounit = IODEFAULT;
if (i & IOHERE)
markhere(yylval.cp, iop);
DBGPRINTF7(("SYNIO: returning 1\n"));
return 1;
}
static void musthave(int c, int cf)
{
if ((peeksym = yylex(cf)) != c) {
DBGPRINTF7(("MUSTHAVE: error!\n"));
SYNTAXERR;
}
peeksym = 0;
}
static struct op *simple(void)
{
struct op *t;
t = NULL;
for (;;) {
switch (peeksym = yylex(0)) {
case '<':
case '>':
(void) synio(0);
break;
case WORD:
if (t == NULL) {
t = newtp();
t->type = TCOM;
}
peeksym = 0;
word(yylval.cp);
break;
default:
return t;
}
}
}
static struct op *nested(int type, int mark)
{
struct op *t;
DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark));
multiline++;
t = c_list();
musthave(mark, 0);
multiline--;
return block(type, t, NOBLOCK, NOWORDS);
}
static struct op *command(int cf)
{
struct op *t;
struct wdblock *iosave;
int c;
DBGPRINTF(("COMMAND: enter, cf=%d\n", cf));
iosave = iolist;
iolist = NULL;
if (multiline)
cf |= CONTIN;
while (synio(cf))
cf = 0;
c = yylex(cf);
switch (c) {
default:
peeksym = c;
t = simple();
if (t == NULL) {
if (iolist == NULL)
return NULL;
t = newtp();
t->type = TCOM;
}
break;
case '(':
t = nested(TPAREN, ')');
break;
case '{':
t = nested(TBRACE, '}');
break;
case FOR:
t = newtp();
t->type = TFOR;
musthave(WORD, 0);
startl = 1;
t->str = yylval.cp;
multiline++;
t->words = wordlist();
c = yylex(0);
if (c != '\n' && c != ';')
peeksym = c;
t->left = dogroup(0);
multiline--;
break;
case WHILE:
case UNTIL:
multiline++;
t = newtp();
t->type = c == WHILE ? TWHILE : TUNTIL;
t->left = c_list();
t->right = dogroup(1);
t->words = NULL;
multiline--;
break;
case CASE:
t = newtp();
t->type = TCASE;
musthave(WORD, 0);
t->str = yylval.cp;
startl++;
multiline++;
musthave(IN, CONTIN);
startl++;
t->left = caselist();
musthave(ESAC, 0);
multiline--;
break;
case IF:
multiline++;
t = newtp();
t->type = TIF;
t->left = c_list();
t->right = thenpart();
musthave(FI, 0);
multiline--;
break;
case DOT:
t = newtp();
t->type = TDOT;
musthave(WORD, 0); /* gets name of file */
DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
word(yylval.cp); /* add word to wdlist */
word(NOWORD); /* terminate wdlist */
t->words = copyw(); /* dup wdlist */
break;
}
while (synio(0));
t = namelist(t);
iolist = iosave;
DBGPRINTF(("COMMAND: returning %p\n", t));
return t;
}
static struct op *dowholefile(int type, int mark)
{
struct op *t;
DBGPRINTF(("DOWHOLEFILE: enter, type=%d, mark=%d\n", type, mark));
multiline++;
t = c_list();
multiline--;
t = block(type, t, NOBLOCK, NOWORDS);
DBGPRINTF(("DOWHOLEFILE: return t=%p\n", t));
return t;
}
static struct op *dogroup(int onlydone)
{
int c;
struct op *mylist;
c = yylex(CONTIN);
if (c == DONE && onlydone)
return NULL;
if (c != DO)
SYNTAXERR;
mylist = c_list();
musthave(DONE, 0);
return mylist;
}
static struct op *thenpart(void)
{
int c;
struct op *t;
c = yylex(0);
if (c != THEN) {
peeksym = c;
return NULL;
}
t = newtp();
t->type = 0;
t->left = c_list();
if (t->left == NULL)
SYNTAXERR;
t->right = elsepart();
return t;
}
static struct op *elsepart(void)
{
int c;
struct op *t;
switch (c = yylex(0)) {
case ELSE:
t = c_list();
if (t == NULL)
SYNTAXERR;
return t;
case ELIF:
t = newtp();
t->type = TELIF;
t->left = c_list();
t->right = thenpart();
return t;
default:
peeksym = c;
return NULL;
}
}
static struct op *caselist(void)
{
struct op *t;
t = NULL;
while ((peeksym = yylex(CONTIN)) != ESAC) {
DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym));
t = list(t, casepart());
}
DBGPRINTF(("CASELIST, returning t=%p\n", t));
return t;
}
static struct op *casepart(void)
{
struct op *t;
DBGPRINTF7(("CASEPART: enter...\n"));
t = newtp();
t->type = TPAT;
t->words = pattern();
musthave(')', 0);
t->left = c_list();
peeksym = yylex(CONTIN);
if (peeksym != ESAC)
musthave(BREAK, CONTIN);
DBGPRINTF7(("CASEPART: made newtp(TPAT, t=%p)\n", t));
return t;
}
static char **pattern(void)
{
int c, cf;
cf = CONTIN;
do {
musthave(WORD, cf);
word(yylval.cp);
cf = 0;
c = yylex(0);
} while (c == '|');
peeksym = c;
word(NOWORD);
return copyw();
}
static char **wordlist(void)
{
int c;
c = yylex(0);
if (c != IN) {
peeksym = c;
return NULL;
}
startl = 0;
while ((c = yylex(0)) == WORD)
word(yylval.cp);
word(NOWORD);
peeksym = c;
return copyw();
}
/*
* supporting functions
*/
static struct op *list(struct op *t1, struct op *t2)
{
DBGPRINTF7(("LIST: enter, t1=%p, t2=%p\n", t1, t2));
if (t1 == NULL)
return t2;
if (t2 == NULL)
return t1;
return block(TLIST, t1, t2, NOWORDS);
}
static struct op *block(int type, struct op *t1, struct op *t2, char **wp)
{
struct op *t;
DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type]));
t = newtp();
t->type = type;
t->left = t1;
t->right = t2;
t->words = wp;
DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1,
t2));
return t;
}
/* See if given string is a shell multiline (FOR, IF, etc) */
static int rlookup(char *n)
{
const struct res *rp;
DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n));
for (rp = restab; rp->r_name; rp++)
if (strcmp(rp->r_name, n) == 0) {
DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val));
return rp->r_val; /* Return numeric code for shell multiline */
}
DBGPRINTF7(("RLOOKUP: NO match, returning 0\n"));
return 0; /* Not a shell multiline */
}
static struct op *newtp(void)
{
struct op *t;
t = (struct op *) tree(sizeof(*t));
t->type = 0;
t->words = NULL;
t->ioact = NULL;
t->left = NULL;
t->right = NULL;
t->str = NULL;
DBGPRINTF3(("NEWTP: allocated %p\n", t));
return t;
}
static struct op *namelist(struct op *t)
{
DBGPRINTF7(("NAMELIST: enter, t=%p, type %s, iolist=%p\n", t,
T_CMD_NAMES[t->type], iolist));
if (iolist) {
iolist = addword((char *) NULL, iolist);
t->ioact = copyio();
} else
t->ioact = NULL;
if (t->type != TCOM) {
if (t->type != TPAREN && t->ioact != NULL) {
t = block(TPAREN, t, NOBLOCK, NOWORDS);
t->ioact = t->left->ioact;
t->left->ioact = NULL;
}
return t;
}
word(NOWORD);
t->words = copyw();
return t;
}
static char **copyw(void)
{
char **wd;
wd = getwords(wdlist);
wdlist = 0;
return wd;
}
static void word(char *cp)
{
wdlist = addword(cp, wdlist);
}
static struct ioword **copyio(void)
{
struct ioword **iop;
iop = (struct ioword **) getwords(iolist);
iolist = 0;
return iop;
}
static struct ioword *io(int u, int f, char *cp)
{
struct ioword *iop;
iop = (struct ioword *) tree(sizeof(*iop));
iop->io_unit = u;
iop->io_flag = f;
iop->io_name = cp;
iolist = addword((char *) iop, iolist);
return iop;
}
static void zzerr(void)
{
yyerror("syntax error");
}
static void yyerror(char *s)
{
yynerrs++;
if (interactive && e.iop <= iostack) {
multiline = 0;
while (eofc() == 0 && yylex(0) != '\n');
}
err(s);
fail();
}
static int yylex(int cf)
{
int c, c1;
int atstart;
c = peeksym;
if (c > 0) {
peeksym = 0;
if (c == '\n')
startl = 1;
return c;
}
nlseen = 0;
atstart = startl;
startl = 0;
yylval.i = 0;
e.linep = line;
/* MALAMO */
line[LINELIM - 1] = '\0';
loop:
while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */
;
switch (c) {
default:
if (any(c, "0123456789")) {
unget(c1 = my_getc(0));
if (c1 == '<' || c1 == '>') {
iounit = c - '0';
goto loop;
}
*e.linep++ = c;
c = c1;
}
break;
case '#': /* Comment, skip to next newline or End-of-string */
while ((c = my_getc(0)) != 0 && c != '\n');
unget(c);
goto loop;
case 0:
DBGPRINTF5(("YYLEX: return 0, c=%d\n", c));
return c;
case '$':
DBGPRINTF9(("YYLEX: found $\n"));
*e.linep++ = c;
if ((c = my_getc(0)) == '{') {
if ((c = collect(c, '}')) != '\0')
return c;
goto pack;
}
break;
case '`':
case '\'':
case '"':
if ((c = collect(c, c)) != '\0')
return c;
goto pack;
case '|':
case '&':
case ';':
startl = 1;
/* If more chars process them, else return NULL char */
if ((c1 = dual(c)) != '\0')
return c1;
else
return c;
case '^':
startl = 1;
return '|';
case '>':
case '<':
diag(c);
return c;
case '\n':
nlseen++;
gethere();
startl = 1;
if (multiline || cf & CONTIN) {
if (interactive && e.iop <= iostack) {
#if ENABLE_FEATURE_COMMAND_EDITING
current_prompt = cprompt->value;
#else
prs(cprompt->value);
#endif
}
if (cf & CONTIN)
goto loop;
}
return c;
case '(':
case ')':
startl = 1;
return c;
}
unget(c);
pack:
while ((c = my_getc(0)) != 0 && !any(c, "`$ '\"\t;&<>()|^\n")) {
if (e.linep >= elinep)
err("word too long");
else
*e.linep++ = c;
};
unget(c);
if (any(c, "\"'`$"))
goto loop;
*e.linep++ = '\0';
if (atstart && (c = rlookup(line)) != 0) {
startl = 1;
return c;
}
yylval.cp = strsave(line, areanum);
return WORD;
}
static int collect(int c, int c1)
{
char s[2];
DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1));
*e.linep++ = c;
while ((c = my_getc(c1)) != c1) {
if (c == 0) {
unget(c);
s[0] = c1;
s[1] = 0;
prs("no closing ");
yyerror(s);
return YYERRCODE;
}
if (interactive && c == '\n' && e.iop <= iostack) {
#if ENABLE_FEATURE_COMMAND_EDITING
current_prompt = cprompt->value;
#else
prs(cprompt->value);
#endif
}
*e.linep++ = c;
}
*e.linep++ = c;
DBGPRINTF8(("COLLECT: return 0, line is %s\n", line));
return 0;
}
/* "multiline commands" helper func */
/* see if next 2 chars form a shell multiline */
static int dual(int c)
{
char s[3];
char *cp = s;
DBGPRINTF8(("DUAL: enter, c=%d\n", c));
*cp++ = c; /* c is the given "peek" char */
*cp++ = my_getc(0); /* get next char of input */
*cp = 0; /* add EOS marker */
c = rlookup(s); /* see if 2 chars form a shell multiline */
if (c == 0)
unget(*--cp); /* String is not a shell multiline, put peek char back */
return c; /* String is multiline, return numeric multiline (restab) code */
}
static void diag(int ec)
{
int c;
DBGPRINTF8(("DIAG: enter, ec=%d\n", ec));
c = my_getc(0);
if (c == '>' || c == '<') {
if (c != ec)
zzerr();
yylval.i = ec == '>' ? IOWRITE | IOCAT : IOHERE;
c = my_getc(0);
} else
yylval.i = ec == '>' ? IOWRITE : IOREAD;
if (c != '&' || yylval.i == IOHERE)
unget(c);
else
yylval.i |= IODUP;
}
static char *tree(unsigned size)
{
char *t;
t = getcell(size);
if (t == NULL) {
DBGPRINTF2(("TREE: getcell(%d) failed!\n", size));
prs("command line too complicated\n");
fail();
/* NOTREACHED */
}
return t;
}
/* VARARGS1 */
/* ARGSUSED */
/* -------- exec.c -------- */
/*
* execute tree
*/
static int execute(struct op *t, int *pin, int *pout, int act)
{
struct op *t1;
volatile int i, rv, a;
char *cp, **wp, **wp2;
struct var *vp;
struct op *outtree_save;
struct brkcon bc;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &wp;
#endif
if (t == NULL) {
DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n"));
return 0;
}
DBGPRINTF(("EXECUTE: t=%p, t->type=%d (%s), t->words is %s\n", t,
t->type, T_CMD_NAMES[t->type],
((t->words == NULL) ? "NULL" : t->words[0])));
rv = 0;
a = areanum++;
wp = (wp2 = t->words) != NULL
? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
: NULL;
switch (t->type) {
case TDOT:
DBGPRINTF3(("EXECUTE: TDOT\n"));
outtree_save = outtree;
newfile(evalstr(t->words[0], DOALL));
t->left = dowholefile(TLIST, 0);
t->right = NULL;
outtree = outtree_save;
if (t->left)
rv = execute(t->left, pin, pout, 0);
if (t->right)
rv = execute(t->right, pin, pout, 0);
break;
case TPAREN:
rv = execute(t->left, pin, pout, 0);
break;
case TCOM:
{
rv = forkexec(t, pin, pout, act, wp);
}
break;
case TPIPE:
{
int pv[2];
rv = openpipe(pv);
if (rv < 0)
break;
pv[0] = remap(pv[0]);
pv[1] = remap(pv[1]);
(void) execute(t->left, pin, pv, 0);
rv = execute(t->right, pv, pout, 0);
}
break;
case TLIST:
(void) execute(t->left, pin, pout, 0);
rv = execute(t->right, pin, pout, 0);
break;
case TASYNC:
{
int hinteractive = interactive;
DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
i = vfork();
if (i != 0) {
interactive = hinteractive;
if (i != -1) {
setval(lookup("!"), putn(i));
if (pin != NULL)
closepipe(pin);
if (interactive) {
prs(putn(i));
prs("\n");
}
} else
rv = -1;
setstatus(rv);
} else {
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
if (interactive)
signal(SIGTERM, SIG_DFL);
interactive = 0;
if (pin == NULL) {
close(0);
open(bb_dev_null, 0);
}
_exit(execute(t->left, pin, pout, FEXEC));
}
}
break;
case TOR:
case TAND:
rv = execute(t->left, pin, pout, 0);
t1 = t->right;
if (t1 != NULL && (rv == 0) == (t->type == TAND))
rv = execute(t1, pin, pout, 0);
break;
case TFOR:
if (wp == NULL) {
wp = dolv + 1;
if ((i = dolc) < 0)
i = 0;
} else {
i = -1;
while (*wp++ != NULL);
}
vp = lookup(t->str);
while (setjmp(bc.brkpt))
if (isbreak)
goto broken;
brkset(&bc);
for (t1 = t->left; i-- && *wp != NULL;) {
setval(vp, *wp++);
rv = execute(t1, pin, pout, 0);
}
brklist = brklist->nextlev;
break;
case TWHILE:
case TUNTIL:
while (setjmp(bc.brkpt))
if (isbreak)
goto broken;
brkset(&bc);
t1 = t->left;
while ((execute(t1, pin, pout, 0) == 0) == (t->type == TWHILE))
rv = execute(t->right, pin, pout, 0);
brklist = brklist->nextlev;
break;
case TIF:
case TELIF:
if (t->right != NULL) {
rv = !execute(t->left, pin, pout, 0) ?
execute(t->right->left, pin, pout, 0) :
execute(t->right->right, pin, pout, 0);
}
break;
case TCASE:
cp = evalstr(t->str, DOSUB | DOTRIM);
if (cp == 0)
cp = "";
DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n",
((t->str == NULL) ? "NULL" : t->str),
((cp == NULL) ? "NULL" : cp)));
t1 = findcase(t->left, cp);
if (t1 != NULL) {
DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=%p, t1=%p)...\n", t, t1));
rv = execute(t1, pin, pout, 0);
DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=%p, t1=%p)...\n", t, t1));
}
break;
case TBRACE:
/*
if (iopp = t->ioact)
while (*iopp)
if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) {
rv = -1;
break;
}
*/
if (rv >= 0 && (t1 = t->left))
rv = execute(t1, pin, pout, 0);
break;
};
broken:
t->words = wp2;
isbreak = 0;
freehere(areanum);
freearea(areanum);
areanum = a;
if (interactive && intr) {
closeall();
fail();
}
i = trapset;
if (i != 0) {
trapset = 0;
runtrap(i);
}
DBGPRINTF(("EXECUTE: returning from t=%p, rv=%d\n", t, rv));
return rv;
}
static int
forkexec(struct op *t, int *pin, int *pout, int act, char **wp)
{
pid_t newpid;
int i, rv;
int (*shcom) (struct op *) = NULL;
int f;
char *cp = NULL;
struct ioword **iopp;
int resetsig;
char **owp;
int forked = 0;
int *hpin = pin;
int *hpout = pout;
char *hwp;
int hinteractive;
int hintr;
struct brkcon *hbrklist;
int hexecflg;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &pin;
(void) &pout;
(void) &wp;
(void) &shcom;
(void) &cp;
(void) &resetsig;
(void) &owp;
#endif
DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, act %d\n", t, pin,
pout, act));
DBGPRINTF7(("FORKEXEC: t->words is %s\n",
((t->words == NULL) ? "NULL" : t->words[0])));
owp = wp;
resetsig = 0;
rv = -1; /* system-detected error */
if (t->type == TCOM) {
while ((cp = *wp++) != NULL);
cp = *wp;
/* strip all initial assignments */
/* not correct wrt PATH=yyy command etc */
if (flag['x']) {
DBGPRINTF9(("FORKEXEC: echo'ing, cp=%p, wp=%p, owp=%p\n",
cp, wp, owp));
echo(cp ? wp : owp);
}
if (cp == NULL && t->ioact == NULL) {
while ((cp = *owp++) != NULL && assign(cp, COPYV));
DBGPRINTF(("FORKEXEC: returning setstatus()\n"));
return setstatus(0);
} else if (cp != NULL) {
shcom = inbuilt(cp);
}
}
t->words = wp;
f = act;
DBGPRINTF(("FORKEXEC: shcom %p, f&FEXEC 0x%x, owp %p\n", shcom,
f & FEXEC, owp));
if (shcom == NULL && (f & FEXEC) == 0) {
/* Save values in case the child process alters them */
hpin = pin;
hpout = pout;
hwp = *wp;
hinteractive = interactive;
hintr = intr;
hbrklist = brklist;
hexecflg = execflg;
DBGPRINTF3(("FORKEXEC: calling vfork()...\n"));
newpid = vfork();
if (newpid == -1) {
DBGPRINTF(("FORKEXEC: ERROR, cannot vfork()!\n"));
return -1;
}
if (newpid > 0) { /* Parent */
/* Restore values */
pin = hpin;
pout = hpout;
*wp = hwp;
interactive = hinteractive;
intr = hintr;
brklist = hbrklist;
execflg = hexecflg;
/* moved up
if (i == -1)
return rv;
*/
if (pin != NULL)
closepipe(pin);
return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0);
}
/* Must be the child process, pid should be 0 */
DBGPRINTF(("FORKEXEC: child process, shcom=%p\n", shcom));
if (interactive) {
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
resetsig = 1;
}
interactive = 0;
intr = 0;
forked = 1;
brklist = 0;
execflg = 0;
}
if (owp != NULL)
while ((cp = *owp++) != NULL && assign(cp, COPYV))
if (shcom == NULL)
export(lookup(cp));
#ifdef COMPIPE
if ((pin != NULL || pout != NULL) && shcom != NULL && shcom != doexec) {
err("piping to/from shell builtins not yet done");
if (forked)
_exit(-1);
return -1;
}
#endif
if (pin != NULL) {
dup2(pin[0], 0);
closepipe(pin);
}
if (pout != NULL) {
dup2(pout[1], 1);
closepipe(pout);
}
iopp = t->ioact;
if (iopp != NULL) {
if (shcom != NULL && shcom != doexec) {
prs(cp);
err(": cannot redirect shell command");
if (forked)
_exit(-1);
return -1;
}
while (*iopp)
if (iosetup(*iopp++, pin != NULL, pout != NULL)) {
if (forked)
_exit(rv);
return rv;
}
}
if (shcom) {
i = setstatus((*shcom) (t));
if (forked)
_exit(i);
DBGPRINTF(("FORKEXEC: returning i=%d\n", i));
return i;
}
/* should use FIOCEXCL */
for (i = FDBASE; i < NOFILE; i++)
close(i);
if (resetsig) {
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
}
if (t->type == TPAREN)
_exit(execute(t->left, NOPIPE, NOPIPE, FEXEC));
if (wp[0] == NULL)
_exit(0);
cp = rexecve(wp[0], wp, makenv(0, NULL));
prs(wp[0]);
prs(": ");
err(cp);
if (!execflg)
trap[0] = NULL;
DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", newpid));
leave();
/* NOTREACHED */
_exit(1);
}
/*
* 0< 1> are ignored as required
* within pipelines.
*/
static int iosetup(struct ioword *iop, int pipein, int pipeout)
{
int u = -1;
char *cp = NULL, *msg;
DBGPRINTF(("IOSETUP: iop %p, pipein %i, pipeout %i\n", iop,
pipein, pipeout));
if (iop->io_unit == IODEFAULT) /* take default */
iop->io_unit = iop->io_flag & (IOREAD | IOHERE) ? 0 : 1;
if (pipein && iop->io_unit == 0)
return 0;
if (pipeout && iop->io_unit == 1)
return 0;
msg = iop->io_flag & (IOREAD | IOHERE) ? "open" : "create";
if ((iop->io_flag & IOHERE) == 0) {
cp = iop->io_name;
if ((cp = evalstr(cp, DOSUB | DOTRIM)) == NULL)
return 1;
}
if (iop->io_flag & IODUP) {
if (cp[1] || (!isdigit(*cp) && *cp != '-')) {
prs(cp);
err(": illegal >& argument");
return 1;
}
if (*cp == '-')
iop->io_flag = IOCLOSE;
iop->io_flag &= ~(IOREAD | IOWRITE);
}
switch (iop->io_flag) {
case IOREAD:
u = open(cp, 0);
break;
case IOHERE:
case IOHERE | IOXHERE:
u = herein(iop->io_name, iop->io_flag & IOXHERE);
cp = "here file";
break;
case IOWRITE | IOCAT:
if ((u = open(cp, 1)) >= 0) {
lseek(u, (long) 0, SEEK_END);
break;
}
case IOWRITE:
u = creat(cp, 0666);
break;
case IODUP:
u = dup2(*cp - '0', iop->io_unit);
break;
case IOCLOSE:
close(iop->io_unit);
return 0;
}
if (u < 0) {
prs(cp);
prs(": cannot ");
warn(msg);
return 1;
} else {
if (u != iop->io_unit) {
dup2(u, iop->io_unit);
close(u);
}
}
return 0;
}
static void echo(char **wp)
{
int i;
prs("+");
for (i = 0; wp[i]; i++) {
if (i)
prs(" ");
prs(wp[i]);
}
prs("\n");
}
static struct op **find1case(struct op *t, char *w)
{
struct op *t1;
struct op **tp;
char **wp, *cp;
if (t == NULL) {
DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n"));
return NULL;
}
DBGPRINTF3(("FIND1CASE: enter, t->type=%d (%s)\n", t->type,
T_CMD_NAMES[t->type]));
if (t->type == TLIST) {
if ((tp = find1case(t->left, w)) != NULL) {
DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=%p\n", tp));
return tp;
}
t1 = t->right; /* TPAT */
} else
t1 = t;
for (wp = t1->words; *wp;)
if ((cp = evalstr(*wp++, DOSUB)) && gmatch(w, cp)) {
DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n",
&t1->left));
return &t1->left;
}
DBGPRINTF(("FIND1CASE: returning NULL\n"));
return NULL;
}
static struct op *findcase(struct op *t, char *w)
{
struct op **tp;
tp = find1case(t, w);
return tp != NULL ? *tp : NULL;
}
/*
* Enter a new loop level (marked for break/continue).
*/
static void brkset(struct brkcon *bc)
{
bc->nextlev = brklist;
brklist = bc;
}
/*
* Wait for the last process created.
* Print a message for each process found
* that was killed by a signal.
* Ignore interrupt signals while waiting
* unless `canintr' is true.
*/
static int waitfor(int lastpid, int canintr)
{
int pid, rv;
int s;
int oheedint = heedint;
heedint = 0;
rv = 0;
do {
pid = wait(&s);
if (pid == -1) {
if (errno != EINTR || canintr)
break;
} else {
rv = WAITSIG(s);
if (rv != 0) {
if (rv < NSIGNAL) {
if (signame[rv] != NULL) {
if (pid != lastpid) {
prn(pid);
prs(": ");
}
prs(signame[rv]);
}
} else {
if (pid != lastpid) {
prn(pid);
prs(": ");
}
prs("Signal ");
prn(rv);
prs(" ");
}
if (WAITCORE(s))
prs(" - core dumped");
if (rv >= NSIGNAL || signame[rv])
prs("\n");
rv = -1;
} else
rv = WAITVAL(s);
}
} while (pid != lastpid);
heedint = oheedint;
if (intr) {
if (interactive) {
if (canintr)
intr = 0;
} else {
if (exstat == 0)
exstat = rv;
onintr(0);
}
}
return rv;
}
static int setstatus(int s)
{
exstat = s;
setval(lookup("?"), putn(s));
return s;
}
/*
* PATH-searching interface to execve.
* If getenv("PATH") were kept up-to-date,
* execvp might be used.
*/
static char *rexecve(char *c, char **v, char **envp)
{
int i;
char *sp, *tp;
int eacces = 0, asis = 0;
char *name = c;
if (ENABLE_FEATURE_SH_STANDALONE_SHELL) {
optind = 1;
if (find_applet_by_name(name)) {
/* We have to exec here since we vforked. Running
* run_applet_by_name() won't work and bad things
* will happen. */
execve(CONFIG_BUSYBOX_EXEC_PATH, v, envp);
}
}
DBGPRINTF(("REXECVE: c=%p, v=%p, envp=%p\n", c, v, envp));
sp = any('/', c) ? "" : path->value;
asis = *sp == '\0';
while (asis || *sp != '\0') {
asis = 0;
tp = e.linep;
for (; *sp != '\0'; tp++)
if ((*tp = *sp++) == ':') {
asis = *sp == '\0';
break;
}
if (tp != e.linep)
*tp++ = '/';
for (i = 0; (*tp++ = c[i++]) != '\0';);
DBGPRINTF3(("REXECVE: e.linep is %s\n", e.linep));
execve(e.linep, v, envp);
switch (errno) {
case ENOEXEC:
*v = e.linep;
tp = *--v;
*v = e.linep;
execve(DEFAULT_SHELL, v, envp);
*v = tp;
return "no Shell";
case ENOMEM:
return (char *) bb_msg_memory_exhausted;
case E2BIG:
return "argument list too long";
case EACCES:
eacces++;
break;
}
}
return errno == ENOENT ? "not found" : "cannot execute";
}
/*
* Run the command produced by generator `f'
* applied to stream `arg'.
*/
static int run(struct ioarg *argp, int (*f) (struct ioarg *))
{
struct op *otree;
struct wdblock *swdlist;
struct wdblock *siolist;
jmp_buf ev, rt;
xint *ofail;
int rv;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &rv;
#endif
DBGPRINTF(("RUN: enter, areanum %d, outtree %p, failpt %p\n",
areanum, outtree, failpt));
areanum++;
swdlist = wdlist;
siolist = iolist;
otree = outtree;
ofail = failpt;
rv = -1;
errpt = ev;
if (newenv(setjmp(errpt)) == 0) {
wdlist = 0;
iolist = 0;
pushio(argp, f);
e.iobase = e.iop;
yynerrs = 0;
failpt = rt;
if (setjmp(failpt) == 0 && yyparse() == 0)
rv = execute(outtree, NOPIPE, NOPIPE, 0);
quitenv();
} else {
DBGPRINTF(("RUN: error from newenv()!\n"));
}
wdlist = swdlist;
iolist = siolist;
failpt = ofail;
outtree = otree;
freearea(areanum--);
return rv;
}
/* -------- do.c -------- */
/*
* built-in commands: doX
*/
static int dohelp(struct op *t)
{
int col;
const struct builtincmd *x;
puts("\nBuilt-in commands:\n"
"-------------------");
for (col = 0, x = builtincmds; x->builtinfunc != NULL; x++) {
if (!x->name)
continue;
col += printf("%s%s", ((col == 0) ? "\t" : " "), x->name);
if (col > 60) {
puts("");
col = 0;
}
}
#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
{
int i;
const struct BB_applet *applet;
for (i = 0, applet = applets; i < NUM_APPLETS; applet++, i++) {
if (!applet->name)
continue;
col += printf("%s%s", ((col == 0) ? "\t" : " "), applet->name);
if (col > 60) {
puts("");
col = 0;
}
}
}
#endif
puts("\n");
return EXIT_SUCCESS;
}
static int dolabel(struct op *t)
{
return 0;
}
static int dochdir(struct op *t)
{
char *cp, *er;
cp = t->words[1];
if (cp == NULL && (cp = homedir->value) == NULL)
er = ": no home directory";
else if (chdir(cp) < 0)
er = ": bad directory";
else
return 0;
prs(cp != NULL ? cp : "cd");
err(er);
return 1;
}
static int doshift(struct op *t)
{
int n;
n = t->words[1] ? getn(t->words[1]) : 1;
if (dolc < n) {
err("nothing to shift");
return 1;
}
dolv[n] = dolv[0];
dolv += n;
dolc -= n;
setval(lookup("#"), putn(dolc));
return 0;
}
/*
* execute login and newgrp directly
*/
static int dologin(struct op *t)
{
char *cp;
if (interactive) {
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
}
cp = rexecve(t->words[0], t->words, makenv(0, NULL));
prs(t->words[0]);
prs(": ");
err(cp);
return 1;
}
static int doumask(struct op *t)
{
int i, n;
char *cp;
cp = t->words[1];
if (cp == NULL) {
i = umask(0);
umask(i);
for (n = 3 * 4; (n -= 3) >= 0;)
putc('0' + ((i >> n) & 07), stderr);
putc('\n', stderr);
} else {
for (n = 0; *cp >= '0' && *cp <= '9'; cp++)
n = n * 8 + (*cp - '0');
umask(n);
}
return 0;
}
static int doexec(struct op *t)
{
int i;
jmp_buf ex;
xint *ofail;
t->ioact = NULL;
for (i = 0; (t->words[i] = t->words[i + 1]) != NULL; i++);
if (i == 0)
return 1;
execflg = 1;
ofail = failpt;
failpt = ex;
if (setjmp(failpt) == 0)
execute(t, NOPIPE, NOPIPE, FEXEC);
failpt = ofail;
execflg = 0;
return 1;
}
static int dodot(struct op *t)
{
int i;
char *sp, *tp;
char *cp;
int maltmp;
DBGPRINTF(("DODOT: enter, t=%p, tleft %p, tright %p, e.linep is %s\n", t, t->left, t->right, ((e.linep == NULL) ? "NULL" : e.linep)));
cp = t->words[1];
if (cp == NULL) {
DBGPRINTF(("DODOT: bad args, ret 0\n"));
return 0;
} else {
DBGPRINTF(("DODOT: cp is %s\n", cp));
}
sp = any('/', cp) ? ":" : path->value;
DBGPRINTF(("DODOT: sp is %s, e.linep is %s\n",
((sp == NULL) ? "NULL" : sp),
((e.linep == NULL) ? "NULL" : e.linep)));
while (*sp) {
tp = e.linep;
while (*sp && (*tp = *sp++) != ':')
tp++;
if (tp != e.linep)
*tp++ = '/';
for (i = 0; (*tp++ = cp[i++]) != '\0';);
/* Original code */
i = open(e.linep, 0);
if (i >= 0) {
exstat = 0;
maltmp = remap(i);
DBGPRINTF(("DODOT: remap=%d, exstat=%d, e.iofd %d, i %d, e.linep is %s\n", maltmp, exstat, e.iofd, i, e.linep));
next(maltmp); /* Basically a PUSHIO */
DBGPRINTF(("DODOT: returning exstat=%d\n", exstat));
return exstat;
}
} /* While */
prs(cp);
err(": not found");
return -1;
}
static int dowait(struct op *t)
{
int i;
char *cp;
cp = t->words[1];
if (cp != NULL) {
i = getn(cp);
if (i == 0)
return 0;
} else
i = -1;
setstatus(waitfor(i, 1));
return 0;
}
static int doread(struct op *t)
{
char *cp, **wp;
int nb = 0;
int nl = 0;
if (t->words[1] == NULL) {
err("Usage: read name ...");
return 1;
}
for (wp = t->words + 1; *wp; wp++) {
for (cp = e.linep; !nl && cp < elinep - 1; cp++) {
nb = read(0, cp, sizeof(*cp));
if (nb != sizeof(*cp) || (nl = (*cp == '\n'))
|| (wp[1] && any(*cp, ifs->value))
) {
break;
}
}
*cp = 0;
if (nb <= 0)
break;
setval(lookup(*wp), e.linep);
}
return nb <= 0;
}
static int doeval(struct op *t)
{
return RUN(awordlist, t->words + 1, wdchar);
}
static int dotrap(struct op *t)
{
int n, i;
int resetsig;
if (t->words[1] == NULL) {
for (i = 0; i <= _NSIG; i++)
if (trap[i]) {
prn(i);
prs(": ");
prs(trap[i]);
prs("\n");
}
return 0;
}
resetsig = isdigit(*t->words[1]);
for (i = resetsig ? 1 : 2; t->words[i] != NULL; ++i) {
n = getsig(t->words[i]);
freecell(trap[n]);
trap[n] = 0;
if (!resetsig) {
if (*t->words[1] != '\0') {
trap[n] = strsave(t->words[1], 0);
setsig(n, sig);
} else
setsig(n, SIG_IGN);
} else {
if (interactive)
if (n == SIGINT)
setsig(n, onintr);
else
setsig(n, n == SIGQUIT ? SIG_IGN : SIG_DFL);
else
setsig(n, SIG_DFL);
}
}
return 0;
}
static int getsig(char *s)
{
int n;
n = getn(s);
if (n < 0 || n > _NSIG) {
err("trap: bad signal number");
n = 0;
}
return n;
}
static void setsig(int n, sighandler_t f)
{
if (n == 0)
return;
if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) {
ourtrap[n] = 1;
signal(n, f);
}
}
static int getn(char *as)
{
char *s;
int n, m;
s = as;
m = 1;
if (*s == '-') {
m = -1;
s++;
}
for (n = 0; isdigit(*s); s++)
n = (n * 10) + (*s - '0');
if (*s) {
prs(as);
err(": bad number");
}
return n * m;
}
static int dobreak(struct op *t)
{
return brkcontin(t->words[1], 1);
}
static int docontinue(struct op *t)
{
return brkcontin(t->words[1], 0);
}
static int brkcontin(char *cp, int val)
{
struct brkcon *bc;
int nl;
nl = cp == NULL ? 1 : getn(cp);
if (nl <= 0)
nl = 999;
do {
if ((bc = brklist) == NULL)
break;
brklist = bc->nextlev;
} while (--nl);
if (nl) {
err("bad break/continue level");
return 1;
}
isbreak = val;
longjmp(bc->brkpt, 1);
/* NOTREACHED */
}
static int doexit(struct op *t)
{
char *cp;
execflg = 0;
if ((cp = t->words[1]) != NULL)
setstatus(getn(cp));
DBGPRINTF(("DOEXIT: calling leave(), t=%p\n", t));
leave();
/* NOTREACHED */
return 0;
}
static int doexport(struct op *t)
{
rdexp(t->words + 1, export, EXPORT);
return 0;
}
static int doreadonly(struct op *t)
{
rdexp(t->words + 1, ronly, RONLY);
return 0;
}
static void rdexp(char **wp, void (*f) (struct var *), int key)
{
DBGPRINTF6(("RDEXP: enter, wp=%p, func=%p, key=%d\n", wp, f, key));
DBGPRINTF6(("RDEXP: *wp=%s\n", *wp));
if (*wp != NULL) {
for (; *wp != NULL; wp++) {
if (isassign(*wp)) {
char *cp;
assign(*wp, COPYV);
for (cp = *wp; *cp != '='; cp++);
*cp = '\0';
}
if (checkname(*wp))
(*f) (lookup(*wp));
else
badid(*wp);
}
} else
putvlist(key, 1);
}
static void badid(char *s)
{
prs(s);
err(": bad identifier");
}
static int doset(struct op *t)
{
struct var *vp;
char *cp;
int n;
cp = t->words[1];
if (cp == NULL) {
for (vp = vlist; vp; vp = vp->next)
varput(vp->name, 1);
return 0;
}
if (*cp == '-') {
/* bad: t->words++; */
for (n = 0; (t->words[n] = t->words[n + 1]) != NULL; n++);
if (*++cp == 0)
flag['x'] = flag['v'] = 0;
else
for (; *cp; cp++)
switch (*cp) {
case 'e':
if (!interactive)
flag['e']++;
break;
default:
if (*cp >= 'a' && *cp <= 'z')
flag[(int) *cp]++;
break;
}
setdash();
}
if (t->words[1]) {
t->words[0] = dolv[0];
for (n = 1; t->words[n]; n++)
setarea((char *) t->words[n], 0);
dolc = n - 1;
dolv = t->words;
setval(lookup("#"), putn(dolc));
setarea((char *) (dolv - 1), 0);
}
return 0;
}
static void varput(char *s, int out)
{
if (isalnum(*s) || *s == '_') {
write(out, s, strlen(s));
write(out, "\n", 1);
}
}
/*
* Copyright (c) 1999 Herbert Xu <herbert@debian.org>
* This file contains code for the times builtin.
*/
static int dotimes(struct op *t)
{
struct tms buf;
long int clk_tck = sysconf(_SC_CLK_TCK);
times(&buf);
printf("%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;
}
static int (*inbuilt(char *s)) (struct op *) {
const struct builtincmd *bp;
for (bp = builtincmds; bp->name != NULL; bp++)
if (strcmp(bp->name, s) == 0)
return bp->builtinfunc;
return NULL;
}
/* -------- eval.c -------- */
/*
* ${}
* `command`
* blank interpretation
* quoting
* glob
*/
static char **eval(char **ap, int f)
{
struct wdblock *wb;
char **wp;
char **wf;
jmp_buf ev;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &wp;
(void) &ap;
#endif
DBGPRINTF4(("EVAL: enter, f=%d\n", f));
wp = NULL;
wb = NULL;
wf = NULL;
errpt = ev;
if (newenv(setjmp(errpt)) == 0) {
while (*ap && isassign(*ap))
expand(*ap++, &wb, f & ~DOGLOB);
if (flag['k']) {
for (wf = ap; *wf; wf++) {
if (isassign(*wf))
expand(*wf, &wb, f & ~DOGLOB);
}
}
for (wb = addword((char *) 0, wb); *ap; ap++) {
if (!flag['k'] || !isassign(*ap))
expand(*ap, &wb, f & ~DOKEY);
}
wb = addword((char *) 0, wb);
wp = getwords(wb);
quitenv();
} else
gflg = 1;
return gflg ? (char **) NULL : wp;
}
/*
* Make the exported environment from the exported
* names in the dictionary. Keyword assignments
* will already have been done.
*/
static char **makenv(int all, struct wdblock *wb)
{
struct var *vp;
DBGPRINTF5(("MAKENV: enter, all=%d\n", all));
for (vp = vlist; vp; vp = vp->next)
if (all || vp->status & EXPORT)
wb = addword(vp->name, wb);
wb = addword((char *) 0, wb);
return getwords(wb);
}
static char *evalstr(char *cp, int f)
{
struct wdblock *wb;
DBGPRINTF6(("EVALSTR: enter, cp=%p, f=%d\n", cp, f));
wb = NULL;
if (expand(cp, &wb, f)) {
if (wb == NULL || wb->w_nword == 0
|| (cp = wb->w_words[0]) == NULL)
cp = "";
DELETE(wb);
} else
cp = NULL;
return cp;
}
static int expand(char *cp, struct wdblock **wbp, int f)
{
jmp_buf ev;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &cp;
#endif
DBGPRINTF3(("EXPAND: enter, f=%d\n", f));
gflg = 0;
if (cp == NULL)
return 0;
if (!anys("$`'\"", cp) &&
!anys(ifs->value, cp) && ((f & DOGLOB) == 0 || !anys("[*?", cp))) {
cp = strsave(cp, areanum);
if (f & DOTRIM)
unquote(cp);
*wbp = addword(cp, *wbp);
return 1;
}
if (newenv(setjmp(errpt = ev)) == 0) {
PUSHIO(aword, cp, strchar);
e.iobase = e.iop;
while ((cp = blank(f)) && gflg == 0) {
e.linep = cp;
cp = strsave(cp, areanum);
if ((f & DOGLOB) == 0) {
if (f & DOTRIM)
unquote(cp);
*wbp = addword(cp, *wbp);
} else
*wbp = glob(cp, *wbp);
}
quitenv();
} else
gflg = 1;
return gflg == 0;
}
/*
* Blank interpretation and quoting
*/
static char *blank(int f)
{
int c, c1;
char *sp;
int scanequals, foundequals;
DBGPRINTF3(("BLANK: enter, f=%d\n", f));
sp = e.linep;
scanequals = f & DOKEY;
foundequals = 0;
loop:
c = subgetc('"', foundequals);
switch (c) {
case 0:
if (sp == e.linep)
return 0;
*e.linep++ = 0;
return sp;
default:
if (f & DOBLANK && any(c, ifs->value))
goto loop;
break;
case '"':
case '\'':
scanequals = 0;
if (INSUB())
break;
for (c1 = c; (c = subgetc(c1, 1)) != c1;) {
if (c == 0)
break;
if (c == '\'' || !any(c, "$`\""))
c |= QUOTE;
*e.linep++ = c;
}
c = 0;
}
unget(c);
if (!isalpha(c) && c != '_')
scanequals = 0;
for (;;) {
c = subgetc('"', foundequals);
if (c == 0 ||
f & (DOBLANK && any(c, ifs->value)) ||
(!INSUB() && any(c, "\"'"))) {
scanequals = 0;
unget(c);
if (any(c, "\"'"))
goto loop;
break;
}
if (scanequals) {
if (c == '=') {
foundequals = 1;
scanequals = 0;
} else if (!isalnum(c) && c != '_')
scanequals = 0;
}
*e.linep++ = c;
}
*e.linep++ = 0;
return sp;
}
/*
* Get characters, substituting for ` and $
*/
static int subgetc(char ec, int quoted)
{
char c;
DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted));
again:
c = my_getc(ec);
if (!INSUB() && ec != '\'') {
if (c == '`') {
if (grave(quoted) == 0)
return 0;
e.iop->task = XGRAVE;
goto again;
}
if (c == '$' && (c = dollar(quoted)) == 0) {
e.iop->task = XDOLL;
goto again;
}
}
return c;
}
/*
* Prepare to generate the string returned by ${} substitution.
*/
static int dollar(int quoted)
{
int otask;
struct io *oiop;
char *dolp;
char *s, c, *cp = NULL;
struct var *vp;
DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted));
c = readc();
s = e.linep;
if (c != '{') {
*e.linep++ = c;
if (isalpha(c) || c == '_') {
while ((c = readc()) != 0 && (isalnum(c) || c == '_'))
if (e.linep < elinep)
*e.linep++ = c;
unget(c);
}
c = 0;
} else {
oiop = e.iop;
otask = e.iop->task;
e.iop->task = XOTHER;
while ((c = subgetc('"', 0)) != 0 && c != '}' && c != '\n')
if (e.linep < elinep)
*e.linep++ = c;
if (oiop == e.iop)
e.iop->task = otask;
if (c != '}') {
err("unclosed ${");
gflg++;
return c;
}
}
if (e.linep >= elinep) {
err("string in ${} too long");
gflg++;
e.linep -= 10;
}
*e.linep = 0;
if (*s)
for (cp = s + 1; *cp; cp++)
if (any(*cp, "=-+?")) {
c = *cp;
*cp++ = 0;
break;
}
if (s[1] == 0 && (*s == '*' || *s == '@')) {
if (dolc > 1) {
/* currently this does not distinguish $* and $@ */
/* should check dollar */
e.linep = s;
PUSHIO(awordlist, dolv + 1, dolchar);
return 0;
} else { /* trap the nasty ${=} */
s[0] = '1';
s[1] = 0;
}
}
vp = lookup(s);
if ((dolp = vp->value) == null) {
switch (c) {
case '=':
if (isdigit(*s)) {
err("cannot use ${...=...} with $n");
gflg++;
break;
}
setval(vp, cp);
dolp = vp->value;
break;
case '-':
dolp = strsave(cp, areanum);
break;
case '?':
if (*cp == 0) {
prs("missing value for ");
err(s);
} else
err(cp);
gflg++;
break;
}
} else if (c == '+')
dolp = strsave(cp, areanum);
if (flag['u'] && dolp == null) {
prs("unset variable: ");
err(s);
gflg++;
}
e.linep = s;
PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
return 0;
}
/*
* Run the command in `...` and read its output.
*/
static int grave(int quoted)
{
char *cp;
int i;
int j;
int pf[2];
static char child_cmd[LINELIM];
char *src;
char *dest;
int count;
int ignore;
int ignore_once;
char *argument_list[4];
struct wdblock *wb = NULL;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &cp;
#endif
for (cp = e.iop->argp->aword; *cp != '`'; cp++)
if (*cp == 0) {
err("no closing `");
return 0;
}
/* string copy with dollar expansion */
src = e.iop->argp->aword;
dest = child_cmd;
count = 0;
ignore = 0;
ignore_once = 0;
while ((*src != '`') && (count < LINELIM)) {
if (*src == '\'')
ignore = !ignore;
if (*src == '\\')
ignore_once = 1;
if (*src == '$' && !ignore && !ignore_once) {
struct var *vp;
char var_name[LINELIM];
char alt_value[LINELIM];
int var_index = 0;
int alt_index = 0;
char operator = 0;
int braces = 0;
char *value;
src++;
if (*src == '{') {
braces = 1;
src++;
}
var_name[var_index++] = *src++;
while (isalnum(*src) || *src=='_')
var_name[var_index++] = *src++;
var_name[var_index] = 0;
if (braces) {
switch (*src) {
case '}':
break;
case '-':
case '=':
case '+':
case '?':
operator = * src;
break;
default:
err("unclosed ${\n");
return 0;
}
if (operator) {
src++;
while (*src && (*src != '}')) {
alt_value[alt_index++] = *src++;
}
alt_value[alt_index] = 0;
if (*src != '}') {
err("unclosed ${\n");
return 0;
}
}
src++;
}
if (isalpha(*var_name)) {
/* let subshell handle it instead */
char *namep = var_name;
*dest++ = '$';
if (braces)
*dest++ = '{';
while (*namep)
*dest++ = *namep++;
if (operator) {
char *altp = alt_value;
*dest++ = operator;
while (*altp)
*dest++ = *altp++;
}
if (braces)
*dest++ = '}';
wb = addword(lookup(var_name)->name, wb);
} else {
/* expand */
vp = lookup(var_name);
if (vp->value != null)
value = (operator == '+') ?
alt_value : vp->value;
else if (operator == '?') {
err(alt_value);
return 0;
} else if (alt_index && (operator != '+')) {
value = alt_value;
if (operator == '=')
setval(vp, value);
} else
continue;
while (*value && (count < LINELIM)) {
*dest++ = *value++;
count++;
}
}
} else {
*dest++ = *src++;
count++;
ignore_once = 0;
}
}
*dest = '\0';
if (openpipe(pf) < 0)
return 0;
while ((i = vfork()) == -1 && errno == EAGAIN);
DBGPRINTF3(("GRAVE: i is %p\n", io));
if (i < 0) {
closepipe(pf);
err((char *) bb_msg_memory_exhausted);
return 0;
}
if (i != 0) {
waitpid(i, NULL, 0);
e.iop->argp->aword = ++cp;
close(pf[1]);
PUSHIO(afile, remap(pf[0]),
(int (*)(struct ioarg *)) ((quoted) ? qgravechar :
gravechar));
return 1;
}
/* allow trapped signals */
/* XXX - Maybe this signal stuff should go as well? */
for (j = 0; j <= _NSIG; j++)
if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN)
signal(j, SIG_DFL);
dup2(pf[1], 1);
closepipe(pf);
argument_list[0] = (char *) DEFAULT_SHELL;
argument_list[1] = "-c";
argument_list[2] = child_cmd;
argument_list[3] = 0;
cp = rexecve(argument_list[0], argument_list, makenv(1, wb));
prs(argument_list[0]);
prs(": ");
err(cp);
_exit(1);
}
static char *unquote(char *as)
{
char *s;
s = as;
if (s != NULL)
while (*s)
*s++ &= ~QUOTE;
return as;
}
/* -------- glob.c -------- */
/*
* glob
*/
#define scopy(x) strsave((x), areanum)
#define BLKSIZ 512
#define NDENT ((BLKSIZ+sizeof(struct dirent)-1)/sizeof(struct dirent))
static struct wdblock *cl, *nl;
static char spcl[] = "[?*";
static struct wdblock *glob(char *cp, struct wdblock *wb)
{
int i;
char *pp;
if (cp == 0)
return wb;
i = 0;
for (pp = cp; *pp; pp++)
if (any(*pp, spcl))
i++;
else if (!any(*pp & ~QUOTE, spcl))
*pp &= ~QUOTE;
if (i != 0) {
for (cl = addword(scopy(cp), (struct wdblock *) 0); anyspcl(cl);
cl = nl) {
nl = newword(cl->w_nword * 2);
for (i = 0; i < cl->w_nword; i++) { /* for each argument */
for (pp = cl->w_words[i]; *pp; pp++)
if (any(*pp, spcl)) {
globname(cl->w_words[i], pp);
break;
}
if (*pp == '\0')
nl = addword(scopy(cl->w_words[i]), nl);
}
for (i = 0; i < cl->w_nword; i++)
DELETE(cl->w_words[i]);
DELETE(cl);
}
for (i = 0; i < cl->w_nword; i++)
unquote(cl->w_words[i]);
glob0((char *) cl->w_words, cl->w_nword, sizeof(char *), xstrcmp);
if (cl->w_nword) {
for (i = 0; i < cl->w_nword; i++)
wb = addword(cl->w_words[i], wb);
DELETE(cl);
return wb;
}
}
wb = addword(unquote(cp), wb);
return wb;
}
static void globname(char *we, char *pp)
{
char *np, *cp;
char *name, *gp, *dp;
int k;
DIR *dirp;
struct dirent *de;
char dname[NAME_MAX + 1];
struct stat dbuf;
for (np = we; np != pp; pp--)
if (pp[-1] == '/')
break;
for (dp = cp = space((int) (pp - np) + 3); np < pp;)
*cp++ = *np++;
*cp++ = '.';
*cp = '\0';
for (gp = cp = space(strlen(pp) + 1); *np && *np != '/';)
*cp++ = *np++;
*cp = '\0';
dirp = opendir(dp);
if (dirp == 0) {
DELETE(dp);
DELETE(gp);
return;
}
dname[NAME_MAX] = '\0';
while ((de = readdir(dirp)) != NULL) {
/* XXX Hmmm... What this could be? (abial) */
/*
if (ent[j].d_ino == 0)
continue;
*/
strncpy(dname, de->d_name, NAME_MAX);
if (dname[0] == '.')
if (*gp != '.')
continue;
for (k = 0; k < NAME_MAX; k++)
if (any(dname[k], spcl))
dname[k] |= QUOTE;
if (gmatch(dname, gp)) {
name = generate(we, pp, dname, np);
if (*np && !anys(np, spcl)) {
if (stat(name, &dbuf)) {
DELETE(name);
continue;
}
}
nl = addword(name, nl);
}
}
closedir(dirp);
DELETE(dp);
DELETE(gp);
}
/*
* generate a pathname as below.
* start..end1 / middle end
* the slashes come for free
*/
static char *generate(char *start1, char *end1, char *middle, char *end)
{
char *p;
char *op, *xp;
p = op =
space((int) (end1 - start1) + strlen(middle) + strlen(end) + 2);
for (xp = start1; xp != end1;)
*op++ = *xp++;
for (xp = middle; (*op++ = *xp++) != '\0';);
op--;
for (xp = end; (*op++ = *xp++) != '\0';);
return p;
}
static int anyspcl(struct wdblock *wb)
{
int i;
char **wd;
wd = wb->w_words;
for (i = 0; i < wb->w_nword; i++)
if (anys(spcl, *wd++))
return 1;
return 0;
}
static int xstrcmp(char *p1, char *p2)
{
return strcmp(*(char **) p1, *(char **) p2);
}
/* -------- word.c -------- */
static struct wdblock *newword(int nw)
{
struct wdblock *wb;
wb = (struct wdblock *) space(sizeof(*wb) + nw * sizeof(char *));
wb->w_bsize = nw;
wb->w_nword = 0;
return wb;
}
static struct wdblock *addword(char *wd, struct wdblock *wb)
{
struct wdblock *wb2;
int nw;
if (wb == NULL)
wb = newword(NSTART);
nw = wb->w_nword;
if (nw >= wb->w_bsize) {
wb2 = newword(nw * 2);
memcpy((char *) wb2->w_words, (char *) wb->w_words,
nw * sizeof(char *));
wb2->w_nword = nw;
DELETE(wb);
wb = wb2;
}
wb->w_words[wb->w_nword++] = wd;
return wb;
}
static
char **getwords(struct wdblock *wb)
{
char **wd;
int nb;
if (wb == NULL)
return NULL;
if (wb->w_nword == 0) {
DELETE(wb);
return NULL;
}
wd = (char **) space(nb = sizeof(*wd) * wb->w_nword);
memcpy((char *) wd, (char *) wb->w_words, nb);
DELETE(wb); /* perhaps should done by caller */
return wd;
}
static int (*func) (char *, char *);
static int globv;
static void glob0(char *a0, unsigned a1, int a2, int (*a3) (char *, char *))
{
func = a3;
globv = a2;
glob1(a0, a0 + a1 * a2);
}
static void glob1(char *base, char *lim)
{
char *i, *j;
int v2;
char *lptr, *hptr;
int c;
unsigned n;
v2 = globv;
top:
n = (int) (lim - base);
if (n <= v2)
return;
n = v2 * (n / (2 * v2));
hptr = lptr = base + n;
i = base;
j = lim - v2;
for (;;) {
if (i < lptr) {
c = (*func) (i, lptr);
if (c == 0) {
glob2(i, lptr -= v2);
continue;
}
if (c < 0) {
i += v2;
continue;
}
}
begin:
if (j > hptr) {
c = (*func) (hptr, j);
if (c == 0) {
glob2(hptr += v2, j);
goto begin;
}
if (c > 0) {
if (i == lptr) {
glob3(i, hptr += v2, j);
i = lptr += v2;
goto begin;
}
glob2(i, j);
j -= v2;
i += v2;
continue;
}
j -= v2;
goto begin;
}
if (i == lptr) {
if (lptr - base >= lim - hptr) {
glob1(hptr + v2, lim);
lim = lptr;
} else {
glob1(base, lptr);
base = hptr + v2;
}
goto top;
}
glob3(j, lptr -= v2, i);
j = hptr -= v2;
}
}
static void glob2(char *i, char *j)
{
char *index1, *index2, c;
int m;
m = globv;
index1 = i;
index2 = j;
do {
c = *index1;
*index1++ = *index2;
*index2++ = c;
} while (--m);
}
static void glob3(char *i, char *j, char *k)
{
char *index1, *index2, *index3;
int c;
int m;
m = globv;
index1 = i;
index2 = j;
index3 = k;
do {
c = *index1;
*index1++ = *index3;
*index3++ = *index2;
*index2++ = c;
} while (--m);
}
/* -------- io.c -------- */
/*
* shell IO
*/
static int my_getc(int ec)
{
int c;
if (e.linep > elinep) {
while ((c = readc()) != '\n' && c);
err("input line too long");
gflg++;
return c;
}
c = readc();
if ((ec != '\'') && (ec != '`') && (e.iop->task != XGRAVE)) {
if (c == '\\') {
c = readc();
if (c == '\n' && ec != '\"')
return my_getc(ec);
c |= QUOTE;
}
}
return c;
}
static void unget(int c)
{
if (e.iop >= e.iobase)
e.iop->peekc = c;
}
static int eofc(void)
{
return e.iop < e.iobase || (e.iop->peekc == 0 && e.iop->prev == 0);
}
static int readc(void)
{
int c;
RCPRINTF(("READC: e.iop %p, e.iobase %p\n", e.iop, e.iobase));
for (; e.iop >= e.iobase; e.iop--) {
RCPRINTF(("READC: e.iop %p, peekc 0x%x\n", e.iop, e.iop->peekc));
c = e.iop->peekc;
if (c != '\0') {
e.iop->peekc = 0;
return c;
} else {
if (e.iop->prev != 0) {
if ((c = (*e.iop->iofn) (e.iop->argp, e.iop)) != '\0') {
if (c == -1) {
e.iop++;
continue;
}
if (e.iop == iostack)
ioecho(c);
return (e.iop->prev = c);
} else if (e.iop->task == XIO && e.iop->prev != '\n') {
e.iop->prev = 0;
if (e.iop == iostack)
ioecho('\n');
return '\n';
}
}
if (e.iop->task == XIO) {
if (multiline) {
return e.iop->prev = 0;
}
if (interactive && e.iop == iostack + 1) {
#if ENABLE_FEATURE_COMMAND_EDITING
current_prompt = prompt->value;
#else
prs(prompt->value);
#endif
}
}
}
} /* FOR */
if (e.iop >= iostack) {
RCPRINTF(("READC: return 0, e.iop %p\n", e.iop));
return 0;
}
DBGPRINTF(("READC: leave()...\n"));
leave();
/* NOTREACHED */
return 0;
}
static void ioecho(char c)
{
if (flag['v'])
write(2, &c, sizeof c);
}
static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
{
DBGPRINTF(("PUSHIO: argp %p, argp->afid 0x%x, e.iop %p\n", argp,
argp->afid, e.iop));
/* Set env ptr for io source to next array spot and check for array overflow */
if (++e.iop >= &iostack[NPUSH]) {
e.iop--;
err("Shell input nested too deeply");
gflg++;
return;
}
/* We did not overflow the NPUSH array spots so setup data structs */
e.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn; /* Store data source func ptr */
if (argp->afid != AFID_NOBUF)
e.iop->argp = argp;
else {
e.iop->argp = ioargstack + (e.iop - iostack); /* MAL - index into stack */
*e.iop->argp = *argp; /* copy data from temp area into stack spot */
/* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */
if (e.iop == &iostack[0])
e.iop->argp->afbuf = &mainbuf;
else
e.iop->argp->afbuf = &sharedbuf;
/* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */
/* This line appears to be active when running scripts from command line */
if ((isatty(e.iop->argp->afile) == 0)
&& (e.iop == &iostack[0]
|| lseek(e.iop->argp->afile, 0L, SEEK_CUR) != -1)) {
if (++bufid == AFID_NOBUF) /* counter rollover check, AFID_NOBUF = 11111111 */
bufid = AFID_ID; /* AFID_ID = 0 */
e.iop->argp->afid = bufid; /* assign buffer id */
}
DBGPRINTF(("PUSHIO: iostack %p, e.iop %p, afbuf %p\n",
iostack, e.iop, e.iop->argp->afbuf));
DBGPRINTF(("PUSHIO: mbuf %p, sbuf %p, bid %d, e.iop %p\n",
&mainbuf, &sharedbuf, bufid, e.iop));
}
e.iop->prev = ~'\n';
e.iop->peekc = 0;
e.iop->xchar = 0;
e.iop->nlcount = 0;
if (fn == filechar || fn == linechar)
e.iop->task = XIO;
else if (fn == (int (*)(struct ioarg *)) gravechar
|| fn == (int (*)(struct ioarg *)) qgravechar)
e.iop->task = XGRAVE;
else
e.iop->task = XOTHER;
return;
}
static struct io *setbase(struct io *ip)
{
struct io *xp;
xp = e.iobase;
e.iobase = ip;
return xp;
}
/*
* Input generating functions
*/
/*
* Produce the characters of a string, then a newline, then EOF.
*/
static int nlchar(struct ioarg *ap)
{
int c;
if (ap->aword == NULL)
return 0;
if ((c = *ap->aword++) == 0) {
ap->aword = NULL;
return '\n';
}
return c;
}
/*
* Given a list of words, produce the characters
* in them, with a space after each word.
*/
static int wdchar(struct ioarg *ap)
{
char c;
char **wl;
wl = ap->awordlist;
if (wl == NULL)
return 0;
if (*wl != NULL) {
c = *(*wl)++;
if (c != 0)
return c & 0177;
ap->awordlist++;
return ' ';
}
ap->awordlist = NULL;
return '\n';
}
/*
* Return the characters of a list of words,
* producing a space between them.
*/
static int dolchar(struct ioarg *ap)
{
char *wp;
wp = *ap->awordlist++;
if (wp != NULL) {
PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar);
return -1;
}
return 0;
}
static int xxchar(struct ioarg *ap)
{
int c;
if (ap->aword == NULL)
return 0;
c = *ap->aword++;
if (c == '\0') {
ap->aword = NULL;
return ' ';
}
return c;
}
/*
* Produce the characters from a single word (string).
*/
static int strchar(struct ioarg *ap)
{
if (ap->aword == NULL)
return 0;
return *ap->aword++;
}
/*
* Produce quoted characters from a single word (string).
*/
static int qstrchar(struct ioarg *ap)
{
int c;
if (ap->aword == NULL)
return 0;
c = *ap->aword++;
if (c)
c |= QUOTE;
return c;
}
/*
* Return the characters from a file.
*/
static int filechar(struct ioarg *ap)
{
int i;
char c;
struct iobuf *bp = ap->afbuf;
if (ap->afid != AFID_NOBUF) {
i = (ap->afid != bp->id);
if (i || bp->bufp == bp->ebufp) {
if (i)
lseek(ap->afile, ap->afpos, SEEK_SET);
i = safe_read(ap->afile, bp->buf, sizeof(bp->buf));
if (i <= 0) {
closef(ap->afile);
return 0;
}
bp->id = ap->afid;
bp->bufp = bp->buf;
bp->ebufp = bp->bufp + i;
}
ap->afpos++;
return *bp->bufp++ & 0177;
}
#if ENABLE_FEATURE_COMMAND_EDITING
if (interactive && isatty(ap->afile)) {
static char mycommand[BUFSIZ];
static int position = 0, size = 0;
while (size == 0 || position >= size) {
read_line_input(current_prompt, mycommand, BUFSIZ, line_input_state);
size = strlen(mycommand);
position = 0;
}
c = mycommand[position];
position++;
return c;
} else
#endif
{
i = safe_read(ap->afile, &c, sizeof(c));
return i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0);
}
}
/*
* Return the characters from a here temp file.
*/
static int herechar(struct ioarg *ap)
{
char c;
if (read(ap->afile, &c, sizeof(c)) != sizeof(c)) {
close(ap->afile);
c = 0;
}
return c;
}
/*
* Return the characters produced by a process (`...`).
* Quote them if required, and remove any trailing newline characters.
*/
static int gravechar(struct ioarg *ap, struct io *iop)
{
int c;
c = qgravechar(ap, iop) & ~QUOTE;
if (c == '\n')
c = ' ';
return c;
}
static int qgravechar(struct ioarg *ap, struct io *iop)
{
int c;
DBGPRINTF3(("QGRAVECHAR: enter, ap=%p, iop=%p\n", ap, iop));
if (iop->xchar) {
if (iop->nlcount) {
iop->nlcount--;
return '\n' | QUOTE;
}
c = iop->xchar;
iop->xchar = 0;
} else if ((c = filechar(ap)) == '\n') {
iop->nlcount = 1;
while ((c = filechar(ap)) == '\n')
iop->nlcount++;
iop->xchar = c;
if (c == 0)
return c;
iop->nlcount--;
c = '\n';
}
return c != 0 ? c | QUOTE : 0;
}
/*
* Return a single command (usually the first line) from a file.
*/
static int linechar(struct ioarg *ap)
{
int c;
c = filechar(ap);
if (c == '\n') {
if (!multiline) {
closef(ap->afile);
ap->afile = -1; /* illegal value */
}
}
return c;
}
static void prs(const char *s)
{
if (*s)
write(2, s, strlen(s));
}
static void prn(unsigned u)
{
prs(itoa(u));
}
static void closef(int i)
{
if (i > 2)
close(i);
}
static void closeall(void)
{
int u;
for (u = NUFILE; u < NOFILE;)
close(u++);
}
/*
* remap fd into Shell's fd space
*/
static int remap(int fd)
{
int i;
int map[NOFILE];
int newfd;
DBGPRINTF(("REMAP: fd=%d, e.iofd=%d\n", fd, e.iofd));
if (fd < e.iofd) {
for (i = 0; i < NOFILE; i++)
map[i] = 0;
do {
map[fd] = 1;
newfd = dup(fd);
fd = newfd;
} while (fd >= 0 && fd < e.iofd);
for (i = 0; i < NOFILE; i++)
if (map[i])
close(i);
if (fd < 0)
err("too many files open in shell");
}
return fd;
}
static int openpipe(int *pv)
{
int i;
i = pipe(pv);
if (i < 0)
err("can't create pipe - try again");
return i;
}
static void closepipe(int *pv)
{
if (pv != NULL) {
close(*pv++);
close(*pv);
}
}
/* -------- here.c -------- */
/*
* here documents
*/
static void markhere(char *s, struct ioword *iop)
{
struct here *h, *lh;
DBGPRINTF7(("MARKHERE: enter, s=%p\n", s));
h = (struct here *) space(sizeof(struct here));
if (h == 0)
return;
h->h_tag = evalstr(s, DOSUB);
if (h->h_tag == 0)
return;
h->h_iop = iop;
iop->io_name = 0;
h->h_next = NULL;
if (inhere == 0)
inhere = h;
else
for (lh = inhere; lh != NULL; lh = lh->h_next)
if (lh->h_next == 0) {
lh->h_next = h;
break;
}
iop->io_flag |= IOHERE | IOXHERE;
for (s = h->h_tag; *s; s++)
if (*s & QUOTE) {
iop->io_flag &= ~IOXHERE;
*s &= ~QUOTE;
}
h->h_dosub = iop->io_flag & IOXHERE;
}
static void gethere(void)
{
struct here *h, *hp;
DBGPRINTF7(("GETHERE: enter...\n"));
/* Scan here files first leaving inhere list in place */
for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub ? 0 : '\'');
/* Make inhere list active - keep list intact for scraphere */
if (hp != NULL) {
hp->h_next = acthere;
acthere = inhere;
inhere = NULL;
}
}
static void readhere(char **name, char *s, int ec)
{
int tf;
char tname[30] = ".msh_XXXXXX";
int c;
jmp_buf ev;
char myline[LINELIM + 1];
char *thenext;
DBGPRINTF7(("READHERE: enter, name=%p, s=%p\n", name, s));
tf = mkstemp(tname);
if (tf < 0)
return;
*name = strsave(tname, areanum);
errpt = ev;
if (newenv(setjmp(errpt)) != 0)
unlink(tname);
else {
pushio(e.iop->argp, (int (*)(struct ioarg *)) e.iop->iofn);
e.iobase = e.iop;
for (;;) {
if (interactive && e.iop <= iostack) {
#if ENABLE_FEATURE_COMMAND_EDITING
current_prompt = cprompt->value;
#else
prs(cprompt->value);
#endif
}
thenext = myline;
while ((c = my_getc(ec)) != '\n' && c) {
if (ec == '\'')
c &= ~QUOTE;
if (thenext >= &myline[LINELIM]) {
c = 0;
break;
}
*thenext++ = c;
}
*thenext = 0;
if (strcmp(s, myline) == 0 || c == 0)
break;
*thenext++ = '\n';
write(tf, myline, (int) (thenext - myline));
}
if (c == 0) {
prs("here document `");
prs(s);
err("' unclosed");
}
quitenv();
}
close(tf);
}
/*
* open here temp file.
* if unquoted here, expand here temp file into second temp file.
*/
static int herein(char *hname, int xdoll)
{
int hf;
int tf;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &tf;
#endif
if (hname == NULL)
return -1;
DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll));
hf = open(hname, 0);
if (hf < 0)
return -1;
if (xdoll) {
char c;
char tname[30] = ".msh_XXXXXX";
jmp_buf ev;
tf = mkstemp(tname);
if (tf < 0)
return -1;
if (newenv(setjmp(errpt = ev)) == 0) {
PUSHIO(afile, hf, herechar);
setbase(e.iop);
while ((c = subgetc(0, 0)) != 0) {
c &= ~QUOTE;
write(tf, &c, sizeof c);
}
quitenv();
} else
unlink(tname);
close(tf);
tf = open(tname, 0);
unlink(tname);
return tf;
} else
return hf;
}
static void scraphere(void)
{
struct here *h;
DBGPRINTF7(("SCRAPHERE: enter...\n"));
for (h = inhere; h != NULL; h = h->h_next) {
if (h->h_iop && h->h_iop->io_name)
unlink(h->h_iop->io_name);
}
inhere = NULL;
}
/* unlink here temp files before a freearea(area) */
static void freehere(int area)
{
struct here *h, *hl;
DBGPRINTF6(("FREEHERE: enter, area=%d\n", area));
hl = NULL;
for (h = acthere; h != NULL; h = h->h_next)
if (getarea((char *) h) >= area) {
if (h->h_iop->io_name != NULL)
unlink(h->h_iop->io_name);
if (hl == NULL)
acthere = h->h_next;
else
hl->h_next = h->h_next;
} else
hl = h;
}
/*
* Copyright (c) 1987,1997, Prentice Hall
* All rights reserved.
*
* Redistribution and use of the MINIX operating system in source and
* binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of Prentice Hall nor the names of the software
* authors or contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, 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 PRENTICE HALL OR ANY AUTHORS 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.
*
*/
Reference in New Issue View Git Blame Copy Permalink