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-Erik
This commit is contained in:
Erik Andersen 2000-03-16 08:09:57 +00:00
parent d75af99529
commit 13456d1fcd
8 changed files with 2262 additions and 0 deletions
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405
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/*
* Termios command line History and Editting for NetBSD sh (ash)
* Copyright (c) 1999
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Adjusted for busybox: Erik Andersen <andersee@debian.org>
*
* You may use this code as you wish, so long as the original author(s)
* are attributed in any redistributions of the source code.
* This code is 'as is' with no warranty.
* This code may safely be consumed by a BSD or GPL license.
*
* v 0.5 19990328 Initial release
*
* Future plans: Simple file and path name completion. (like BASH)
*
*/
/*
Usage and Known bugs:
Terminal key codes are not extensive, and more will probably
need to be added. This version was created on Debian GNU/Linux 2.x.
Delete, Backspace, Home, End, and the arrow keys were tested
to work in an Xterm and console. Ctrl-A also works as Home.
Ctrl-E also works as End. The binary size increase is <3K.
Editting will not display correctly for lines greater then the
terminal width. (more then one line.) However, history will.
*/
#include "internal.h"
#ifdef BB_FEATURE_SH_COMMAND_EDITING
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <termio.h>
#include <ctype.h>
#include <signal.h>
#include "cmdedit.h"
#define MAX_HISTORY 15 /* Maximum length of the linked list for the command line history */
#define ESC 27
#define DEL 127
static struct history *his_front = NULL; /* First element in command line list */
static struct history *his_end = NULL; /* Last element in command line list */
static struct termio old_term, new_term; /* Current termio and the previous termio before starting ash */
static int history_counter = 0; /* Number of commands in history list */
static int reset_term = 0; /* Set to true if the terminal needs to be reset upon exit */
char *parsenextc; /* copy of parsefile->nextc */
struct history {
char *s;
struct history *p;
struct history *n;
};
/* Version of write which resumes after a signal is caught. */
int xwrite(int fd, char *buf, int nbytes)
{
int ntry;
int i;
int n;
n = nbytes;
ntry = 0;
for (;;) {
i = write(fd, buf, n);
if (i > 0) {
if ((n -= i) <= 0)
return nbytes;
buf += i;
ntry = 0;
} else if (i == 0) {
if (++ntry > 10)
return nbytes - n;
} else if (errno != EINTR) {
return -1;
}
}
}
/* Version of ioctl that retries after a signal is caught. */
int xioctl(int fd, unsigned long request, char *arg)
{
int i;
while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
return i;
}
void cmdedit_reset_term(void)
{
if (reset_term)
xioctl(fileno(stdin), TCSETA, (void *) &old_term);
}
void gotaSignal(int sig)
{
cmdedit_reset_term();
fprintf(stdout, "\n");
exit(TRUE);
}
void input_home(int outputFd, int *cursor)
{ /* Command line input routines */
while (*cursor > 0) {
xwrite(outputFd, "\b", 1);
--*cursor;
}
}
void input_delete(int outputFd, int cursor)
{
int j = 0;
memmove(parsenextc + cursor, parsenextc + cursor + 1,
BUFSIZ - cursor - 1);
for (j = cursor; j < (BUFSIZ - 1); j++) {
if (!*(parsenextc + j))
break;
else
xwrite(outputFd, (parsenextc + j), 1);
}
xwrite(outputFd, " \b", 2);
while (j-- > cursor)
xwrite(outputFd, "\b", 1);
}
void input_end(int outputFd, int *cursor, int len)
{
while (*cursor < len) {
xwrite(outputFd, "\033[C", 3);
++*cursor;
}
}
void input_backspace(int outputFd, int *cursor, int *len)
{
int j = 0;
if (*cursor > 0) {
xwrite(outputFd, "\b \b", 3);
--*cursor;
memmove(parsenextc + *cursor, parsenextc + *cursor + 1,
BUFSIZ - *cursor + 1);
for (j = *cursor; j < (BUFSIZ - 1); j++) {
if (!*(parsenextc + j))
break;
else
xwrite(outputFd, (parsenextc + j), 1);
}
xwrite(outputFd, " \b", 2);
while (j-- > *cursor)
xwrite(outputFd, "\b", 1);
--*len;
}
}
extern int cmdedit_read_input(int inputFd, int outputFd,
char command[BUFSIZ])
{
int nr = 0;
int len = 0;
int j = 0;
int cursor = 0;
int break_out = 0;
int ret = 0;
char c = 0;
struct history *hp = his_end;
memset(command, 0, sizeof(command));
parsenextc = command;
if (!reset_term) {
xioctl(inputFd, TCGETA, (void *) &old_term);
memcpy(&new_term, &old_term, sizeof(struct termio));
new_term.c_cc[VMIN] = 1;
new_term.c_cc[VTIME] = 0;
new_term.c_lflag &= ~ICANON; /* unbuffered input */
new_term.c_lflag &= ~ECHO;
xioctl(inputFd, TCSETA, (void *) &new_term);
reset_term = 1;
} else {
xioctl(inputFd, TCSETA, (void *) &new_term);
}
memset(parsenextc, 0, BUFSIZ);
while (1) {
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
switch (c) {
case 1: /* Control-A Beginning of line */
input_home(outputFd, &cursor);
break;
case 5: /* Control-E EOL */
input_end(outputFd, &cursor, len);
break;
case 4: /* Control-D */
if (cursor != len) {
input_delete(outputFd, cursor);
len--;
}
break;
case '\b': /* Backspace */
case DEL:
input_backspace(outputFd, &cursor, &len);
break;
case '\n': /* Enter */
*(parsenextc + len++ + 1) = c;
xwrite(outputFd, &c, 1);
break_out = 1;
break;
case ESC: /* escape sequence follows */
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
if (c == '[') { /* 91 */
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
switch (c) {
case 'A':
if (hp && hp->p) { /* Up */
hp = hp->p;
goto hop;
}
break;
case 'B':
if (hp && hp->n && hp->n->s) { /* Down */
hp = hp->n;
goto hop;
}
break;
hop: /* hop */
len = strlen(parsenextc);
for (; cursor > 0; cursor--) /* return to begining of line */
xwrite(outputFd, "\b", 1);
for (j = 0; j < len; j++) /* erase old command */
xwrite(outputFd, " ", 1);
for (j = len; j > 0; j--) /* return to begining of line */
xwrite(outputFd, "\b", 1);
strcpy(parsenextc, hp->s); /* write new command */
len = strlen(hp->s);
xwrite(outputFd, parsenextc, len);
cursor = len;
break;
case 'C': /* Right */
if (cursor < len) {
xwrite(outputFd, "\033[C", 3);
cursor++;
}
break;
case 'D': /* Left */
if (cursor > 0) {
xwrite(outputFd, "\033[D", 3);
cursor--;
}
break;
case '3': /* Delete */
if (cursor != len) {
input_delete(outputFd, cursor);
len--;
}
break;
case '1': /* Home (Ctrl-A) */
input_home(outputFd, &cursor);
break;
case '4': /* End (Ctrl-E) */
input_end(outputFd, &cursor, len);
break;
}
if (c == '1' || c == '3' || c == '4')
if ((ret = read(inputFd, &c, 1)) < 1)
return ret; /* read 126 (~) */
}
if (c == 'O') { /* 79 */
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
switch (c) {
case 'H': /* Home (xterm) */
input_home(outputFd, &cursor);
break;
case 'F': /* End (xterm) */
input_end(outputFd, &cursor, len);
break;
}
}
c = 0;
break;
default: /* If it's regular input, do the normal thing */
if (!isprint(c)) /* Skip non-printable characters */
break;
if (len >= (BUFSIZ - 2)) /* Need to leave space for enter */
break;
len++;
if (cursor == (len - 1)) { /* Append if at the end of the line */
*(parsenextc + cursor) = c;
} else { /* Insert otherwise */
memmove(parsenextc + cursor + 1, parsenextc + cursor,
len - cursor - 1);
*(parsenextc + cursor) = c;
for (j = cursor; j < len; j++)
xwrite(outputFd, parsenextc + j, 1);
for (; j > cursor; j--)
xwrite(outputFd, "\033[D", 3);
}
cursor++;
xwrite(outputFd, &c, 1);
break;
}
if (break_out) /* Enter is the command terminator, no more input. */
break;
}
nr = len + 1;
xioctl(inputFd, TCSETA, (void *) &old_term);
reset_term = 0;
if (*(parsenextc)) { /* Handle command history log */
struct history *h = his_end;
if (!h) { /* No previous history */
h = his_front = malloc(sizeof(struct history));
h->n = malloc(sizeof(struct history));
h->p = NULL;
h->s = strdup(parsenextc);
h->n->p = h;
h->n->n = NULL;
h->n->s = NULL;
his_end = h->n;
history_counter++;
} else { /* Add a new history command */
h->n = malloc(sizeof(struct history));
h->n->p = h;
h->n->n = NULL;
h->n->s = NULL;
h->s = strdup(parsenextc);
his_end = h->n;
if (history_counter >= MAX_HISTORY) { /* After max history, remove the last known command */
struct history *p = his_front->n;
p->p = NULL;
free(his_front->s);
free(his_front);
his_front = p;
} else {
history_counter++;
}
}
}
return nr;
}
extern void cmdedit_init(void)
{
atexit(cmdedit_reset_term);
signal(SIGINT, gotaSignal);
signal(SIGQUIT, gotaSignal);
signal(SIGTERM, gotaSignal);
}
#endif /* BB_FEATURE_SH_COMMAND_EDITING */

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/*
* Termios command line History and Editting for NetBSD sh (ash)
* Copyright (c) 1999
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Adjusted for busybox: Erik Andersen <andersee@debian.org>
*
* You may use this code as you wish, so long as the original author(s)
* are attributed in any redistributions of the source code.
* This code is 'as is' with no warranty.
* This code may safely be consumed by a BSD or GPL license.
*
*/
extern int cmdedit_read_input(int inputFd, int outputFd, char command[BUFSIZ]);
extern void cmdedit_init(void);

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/* vi: set sw=4 ts=4: */
/*
* echo implementation for busybox
*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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
*
* Original copyright notice is retained at the end of this file.
*/
#include "internal.h"
#include <stdio.h>
extern int
echo_main(int argc, char** argv)
{
register char **ap;
register char *p;
register char c;
int nflag = 0;
int eflag = 0;
ap = argv;
if (argc)
ap++;
while ((p = *ap) != NULL && *p == '-') {
if (strcmp(p, "-n")==0) {
nflag = 1;
} else if (strcmp(p, "-e")==0) {
eflag = 1;
} else if (strcmp(p, "-E")==0) {
eflag = 0;
}
else break;
ap++;
}
while ((p = *ap++) != NULL) {
while ((c = *p++) != '\0') {
if (c == '\\' && eflag) {
switch (c = *p++) {
case 'a': c = '\007'; break;
case 'b': c = '\b'; break;
case 'c': exit( 0); /* exit */
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = '\v'; break;
case '\\': break; /* c = '\\' */
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c -= '0';
if (*p >= '0' && *p <= '7')
c = c * 8 + (*p++ - '0');
if (*p >= '0' && *p <= '7')
c = c * 8 + (*p++ - '0');
break;
default:
p--;
break;
}
}
putchar(c);
}
if (*ap)
putchar(' ');
}
if (! nflag)
putchar('\n');
fflush(stdout);
exit( 0);
}
/*-
* Copyright (c) 1991, 1993
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*
* @(#)echo.c 8.1 (Berkeley) 5/31/93
*/

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/* vi: set sw=4 ts=4: */
/*
* echo implementation for busybox
*
* Copyright (c) by a whole pile of folks:
*
* test(1); version 7-like -- author Erik Baalbergen
* modified by Eric Gisin to be used as built-in.
* modified by Arnold Robbins to add SVR3 compatibility
* (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
* modified by J.T. Conklin for NetBSD.
* modified by Herbert Xu to be used as built-in in ash.
* modified by Erik Andersen <andersee@debian.org> to be used
* in busybox.
*
* 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
*
* Original copyright notice states:
* "This program is in the Public Domain."
*/
#include "internal.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/* test(1) accepts the following grammar:
oexpr ::= aexpr | aexpr "-o" oexpr ;
aexpr ::= nexpr | nexpr "-a" aexpr ;
nexpr ::= primary | "!" primary
primary ::= unary-operator operand
| operand binary-operator operand
| operand
| "(" oexpr ")"
;
unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
"-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
"-nt"|"-ot"|"-ef";
operand ::= <any legal UNIX file name>
*/
enum token {
EOI,
FILRD,
FILWR,
FILEX,
FILEXIST,
FILREG,
FILDIR,
FILCDEV,
FILBDEV,
FILFIFO,
FILSOCK,
FILSYM,
FILGZ,
FILTT,
FILSUID,
FILSGID,
FILSTCK,
FILNT,
FILOT,
FILEQ,
FILUID,
FILGID,
STREZ,
STRNZ,
STREQ,
STRNE,
STRLT,
STRGT,
INTEQ,
INTNE,
INTGE,
INTGT,
INTLE,
INTLT,
UNOT,
BAND,
BOR,
LPAREN,
RPAREN,
OPERAND
};
enum token_types {
UNOP,
BINOP,
BUNOP,
BBINOP,
PAREN
};
struct t_op {
const char *op_text;
short op_num, op_type;
} const ops [] = {
{"-r", FILRD, UNOP},
{"-w", FILWR, UNOP},
{"-x", FILEX, UNOP},
{"-e", FILEXIST,UNOP},
{"-f", FILREG, UNOP},
{"-d", FILDIR, UNOP},
{"-c", FILCDEV,UNOP},
{"-b", FILBDEV,UNOP},
{"-p", FILFIFO,UNOP},
{"-u", FILSUID,UNOP},
{"-g", FILSGID,UNOP},
{"-k", FILSTCK,UNOP},
{"-s", FILGZ, UNOP},
{"-t", FILTT, UNOP},
{"-z", STREZ, UNOP},
{"-n", STRNZ, UNOP},
{"-h", FILSYM, UNOP}, /* for backwards compat */
{"-O", FILUID, UNOP},
{"-G", FILGID, UNOP},
{"-L", FILSYM, UNOP},
{"-S", FILSOCK,UNOP},
{"=", STREQ, BINOP},
{"!=", STRNE, BINOP},
{"<", STRLT, BINOP},
{">", STRGT, BINOP},
{"-eq", INTEQ, BINOP},
{"-ne", INTNE, BINOP},
{"-ge", INTGE, BINOP},
{"-gt", INTGT, BINOP},
{"-le", INTLE, BINOP},
{"-lt", INTLT, BINOP},
{"-nt", FILNT, BINOP},
{"-ot", FILOT, BINOP},
{"-ef", FILEQ, BINOP},
{"!", UNOT, BUNOP},
{"-a", BAND, BBINOP},
{"-o", BOR, BBINOP},
{"(", LPAREN, PAREN},
{")", RPAREN, PAREN},
{0, 0, 0}
};
char **t_wp;
struct t_op const *t_wp_op;
static gid_t *group_array = NULL;
static int ngroups;
static enum token t_lex();
static int oexpr();
static int aexpr();
static int nexpr();
static int binop();
static int primary();
static int filstat();
static int getn();
static int newerf();
static int olderf();
static int equalf();
static void syntax();
static int test_eaccess();
static int is_a_group_member();
static void initialize_group_array();
extern int
test_main(int argc, char** argv)
{
int res;
if (strcmp(argv[0], "[") == 0) {
if (strcmp(argv[--argc], "]"))
fatalError("missing ]");
argv[argc] = NULL;
}
/* Implement special cases from POSIX.2, section 4.62.4 */
switch (argc) {
case 1:
exit( 1);
case 2:
exit (*argv[1] == '\0');
case 3:
if (argv[1][0] == '!' && argv[1][1] == '\0') {
exit (!(*argv[2] == '\0'));
}
break;
case 4:
if (argv[1][0] != '!' || argv[1][1] != '\0') {
if (t_lex(argv[2]),
t_wp_op && t_wp_op->op_type == BINOP) {
t_wp = &argv[1];
exit (binop() == 0);
}
}
break;
case 5:
if (argv[1][0] == '!' && argv[1][1] == '\0') {
if (t_lex(argv[3]),
t_wp_op && t_wp_op->op_type == BINOP) {
t_wp = &argv[2];
exit (!(binop() == 0));
}
}
break;
}
t_wp = &argv[1];
res = !oexpr(t_lex(*t_wp));
if (*t_wp != NULL && *++t_wp != NULL)
syntax(*t_wp, "unknown operand");
exit( res);
}
static void
syntax(op, msg)
char *op;
char *msg;
{
if (op && *op)
fatalError("%s: %s", op, msg);
else
fatalError("%s", msg);
}
static int
oexpr(n)
enum token n;
{
int res;
res = aexpr(n);
if (t_lex(*++t_wp) == BOR)
return oexpr(t_lex(*++t_wp)) || res;
t_wp--;
return res;
}
static int
aexpr(n)
enum token n;
{
int res;
res = nexpr(n);
if (t_lex(*++t_wp) == BAND)
return aexpr(t_lex(*++t_wp)) && res;
t_wp--;
return res;
}
static int
nexpr(n)
enum token n; /* token */
{
if (n == UNOT)
return !nexpr(t_lex(*++t_wp));
return primary(n);
}
static int
primary(n)
enum token n;
{
int res;
if (n == EOI)
syntax(NULL, "argument expected");
if (n == LPAREN) {
res = oexpr(t_lex(*++t_wp));
if (t_lex(*++t_wp) != RPAREN)
syntax(NULL, "closing paren expected");
return res;
}
if (t_wp_op && t_wp_op->op_type == UNOP) {
/* unary expression */
if (*++t_wp == NULL)
syntax(t_wp_op->op_text, "argument expected");
switch (n) {
case STREZ:
return strlen(*t_wp) == 0;
case STRNZ:
return strlen(*t_wp) != 0;
case FILTT:
return isatty(getn(*t_wp));
default:
return filstat(*t_wp, n);
}
}
if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
return binop();
}
return strlen(*t_wp) > 0;
}
static int
binop()
{
const char *opnd1, *opnd2;
struct t_op const *op;
opnd1 = *t_wp;
(void) t_lex(*++t_wp);
op = t_wp_op;
if ((opnd2 = *++t_wp) == (char *)0)
syntax(op->op_text, "argument expected");
switch (op->op_num) {
case STREQ:
return strcmp(opnd1, opnd2) == 0;
case STRNE:
return strcmp(opnd1, opnd2) != 0;
case STRLT:
return strcmp(opnd1, opnd2) < 0;
case STRGT:
return strcmp(opnd1, opnd2) > 0;
case INTEQ:
return getn(opnd1) == getn(opnd2);
case INTNE:
return getn(opnd1) != getn(opnd2);
case INTGE:
return getn(opnd1) >= getn(opnd2);
case INTGT:
return getn(opnd1) > getn(opnd2);
case INTLE:
return getn(opnd1) <= getn(opnd2);
case INTLT:
return getn(opnd1) < getn(opnd2);
case FILNT:
return newerf (opnd1, opnd2);
case FILOT:
return olderf (opnd1, opnd2);
case FILEQ:
return equalf (opnd1, opnd2);
}
/* NOTREACHED */
return 1;
}
static int
filstat(nm, mode)
char *nm;
enum token mode;
{
struct stat s;
int i;
if (mode == FILSYM) {
#ifdef S_IFLNK
if (lstat(nm, &s) == 0) {
i = S_IFLNK;
goto filetype;
}
#endif
return 0;
}
if (stat(nm, &s) != 0)
return 0;
switch (mode) {
case FILRD:
return test_eaccess(nm, R_OK) == 0;
case FILWR:
return test_eaccess(nm, W_OK) == 0;
case FILEX:
return test_eaccess(nm, X_OK) == 0;
case FILEXIST:
return 1;
case FILREG:
i = S_IFREG;
goto filetype;
case FILDIR:
i = S_IFDIR;
goto filetype;
case FILCDEV:
i = S_IFCHR;
goto filetype;
case FILBDEV:
i = S_IFBLK;
goto filetype;
case FILFIFO:
#ifdef S_IFIFO
i = S_IFIFO;
goto filetype;
#else
return 0;
#endif
case FILSOCK:
#ifdef S_IFSOCK
i = S_IFSOCK;
goto filetype;
#else
return 0;
#endif
case FILSUID:
i = S_ISUID;
goto filebit;
case FILSGID:
i = S_ISGID;
goto filebit;
case FILSTCK:
i = S_ISVTX;
goto filebit;
case FILGZ:
return s.st_size > 0L;
case FILUID:
return s.st_uid == geteuid();
case FILGID:
return s.st_gid == getegid();
default:
return 1;
}
filetype:
return ((s.st_mode & S_IFMT) == i);
filebit:
return ((s.st_mode & i) != 0);
}
static enum token
t_lex(s)
char *s;
{
struct t_op const *op = ops;
if (s == 0) {
t_wp_op = (struct t_op *)0;
return EOI;
}
while (op->op_text) {
if (strcmp(s, op->op_text) == 0) {
t_wp_op = op;
return op->op_num;
}
op++;
}
t_wp_op = (struct t_op *)0;
return OPERAND;
}
/* atoi with error detection */
static int
getn(s)
char *s;
{
char *p;
long r;
errno = 0;
r = strtol(s, &p, 10);
if (errno != 0)
fatalError("%s: out of range", s);
while (isspace(*p))
p++;
if (*p)
fatalError("%s: bad number", s);
return (int) r;
}
static int
newerf (f1, f2)
char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_mtime > b2.st_mtime);
}
static int
olderf (f1, f2)
char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_mtime < b2.st_mtime);
}
static int
equalf (f1, f2)
char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_dev == b2.st_dev &&
b1.st_ino == b2.st_ino);
}
/* Do the same thing access(2) does, but use the effective uid and gid,
and don't make the mistake of telling root that any file is
executable. */
static int
test_eaccess (path, mode)
char *path;
int mode;
{
struct stat st;
int euid = geteuid();
if (stat (path, &st) < 0)
return (-1);
if (euid == 0) {
/* Root can read or write any file. */
if (mode != X_OK)
return (0);
/* Root can execute any file that has any one of the execute
bits set. */
if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
return (0);
}
if (st.st_uid == euid) /* owner */
mode <<= 6;
else if (is_a_group_member (st.st_gid))
mode <<= 3;
if (st.st_mode & mode)
return (0);
return (-1);
}
static void
initialize_group_array ()
{
ngroups = getgroups(0, NULL);
if ((group_array = realloc(group_array, ngroups * sizeof(gid_t))) == NULL)
fatalError("Out of space");
getgroups(ngroups, group_array);
}
/* Return non-zero if GID is one that we have in our groups list. */
static int
is_a_group_member (gid)
gid_t gid;
{
register int i;
/* Short-circuit if possible, maybe saving a call to getgroups(). */
if (gid == getgid() || gid == getegid())
return (1);
if (ngroups == 0)
initialize_group_array ();
/* Search through the list looking for GID. */
for (i = 0; i < ngroups; i++)
if (gid == group_array[i])
return (1);
return (0);
}

126
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/* vi: set sw=4 ts=4: */
/*
* echo implementation for busybox
*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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
*
* Original copyright notice is retained at the end of this file.
*/
#include "internal.h"
#include <stdio.h>
extern int
echo_main(int argc, char** argv)
{
register char **ap;
register char *p;
register char c;
int nflag = 0;
int eflag = 0;
ap = argv;
if (argc)
ap++;
while ((p = *ap) != NULL && *p == '-') {
if (strcmp(p, "-n")==0) {
nflag = 1;
} else if (strcmp(p, "-e")==0) {
eflag = 1;
} else if (strcmp(p, "-E")==0) {
eflag = 0;
}
else break;
ap++;
}
while ((p = *ap++) != NULL) {
while ((c = *p++) != '\0') {
if (c == '\\' && eflag) {
switch (c = *p++) {
case 'a': c = '\007'; break;
case 'b': c = '\b'; break;
case 'c': exit( 0); /* exit */
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = '\v'; break;
case '\\': break; /* c = '\\' */
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c -= '0';
if (*p >= '0' && *p <= '7')
c = c * 8 + (*p++ - '0');
if (*p >= '0' && *p <= '7')
c = c * 8 + (*p++ - '0');
break;
default:
p--;
break;
}
}
putchar(c);
}
if (*ap)
putchar(' ');
}
if (! nflag)
putchar('\n');
fflush(stdout);
exit( 0);
}
/*-
* Copyright (c) 1991, 1993
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*
* @(#)echo.c 8.1 (Berkeley) 5/31/93
*/

405
shell/cmdedit.c Normal file
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@ -0,0 +1,405 @@
/*
* Termios command line History and Editting for NetBSD sh (ash)
* Copyright (c) 1999
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Adjusted for busybox: Erik Andersen <andersee@debian.org>
*
* You may use this code as you wish, so long as the original author(s)
* are attributed in any redistributions of the source code.
* This code is 'as is' with no warranty.
* This code may safely be consumed by a BSD or GPL license.
*
* v 0.5 19990328 Initial release
*
* Future plans: Simple file and path name completion. (like BASH)
*
*/
/*
Usage and Known bugs:
Terminal key codes are not extensive, and more will probably
need to be added. This version was created on Debian GNU/Linux 2.x.
Delete, Backspace, Home, End, and the arrow keys were tested
to work in an Xterm and console. Ctrl-A also works as Home.
Ctrl-E also works as End. The binary size increase is <3K.
Editting will not display correctly for lines greater then the
terminal width. (more then one line.) However, history will.
*/
#include "internal.h"
#ifdef BB_FEATURE_SH_COMMAND_EDITING
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <termio.h>
#include <ctype.h>
#include <signal.h>
#include "cmdedit.h"
#define MAX_HISTORY 15 /* Maximum length of the linked list for the command line history */
#define ESC 27
#define DEL 127
static struct history *his_front = NULL; /* First element in command line list */
static struct history *his_end = NULL; /* Last element in command line list */
static struct termio old_term, new_term; /* Current termio and the previous termio before starting ash */
static int history_counter = 0; /* Number of commands in history list */
static int reset_term = 0; /* Set to true if the terminal needs to be reset upon exit */
char *parsenextc; /* copy of parsefile->nextc */
struct history {
char *s;
struct history *p;
struct history *n;
};
/* Version of write which resumes after a signal is caught. */
int xwrite(int fd, char *buf, int nbytes)
{
int ntry;
int i;
int n;
n = nbytes;
ntry = 0;
for (;;) {
i = write(fd, buf, n);
if (i > 0) {
if ((n -= i) <= 0)
return nbytes;
buf += i;
ntry = 0;
} else if (i == 0) {
if (++ntry > 10)
return nbytes - n;
} else if (errno != EINTR) {
return -1;
}
}
}
/* Version of ioctl that retries after a signal is caught. */
int xioctl(int fd, unsigned long request, char *arg)
{
int i;
while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
return i;
}
void cmdedit_reset_term(void)
{
if (reset_term)
xioctl(fileno(stdin), TCSETA, (void *) &old_term);
}
void gotaSignal(int sig)
{
cmdedit_reset_term();
fprintf(stdout, "\n");
exit(TRUE);
}
void input_home(int outputFd, int *cursor)
{ /* Command line input routines */
while (*cursor > 0) {
xwrite(outputFd, "\b", 1);
--*cursor;
}
}
void input_delete(int outputFd, int cursor)
{
int j = 0;
memmove(parsenextc + cursor, parsenextc + cursor + 1,
BUFSIZ - cursor - 1);
for (j = cursor; j < (BUFSIZ - 1); j++) {
if (!*(parsenextc + j))
break;
else
xwrite(outputFd, (parsenextc + j), 1);
}
xwrite(outputFd, " \b", 2);
while (j-- > cursor)
xwrite(outputFd, "\b", 1);
}
void input_end(int outputFd, int *cursor, int len)
{
while (*cursor < len) {
xwrite(outputFd, "\033[C", 3);
++*cursor;
}
}
void input_backspace(int outputFd, int *cursor, int *len)
{
int j = 0;
if (*cursor > 0) {
xwrite(outputFd, "\b \b", 3);
--*cursor;
memmove(parsenextc + *cursor, parsenextc + *cursor + 1,
BUFSIZ - *cursor + 1);
for (j = *cursor; j < (BUFSIZ - 1); j++) {
if (!*(parsenextc + j))
break;
else
xwrite(outputFd, (parsenextc + j), 1);
}
xwrite(outputFd, " \b", 2);
while (j-- > *cursor)
xwrite(outputFd, "\b", 1);
--*len;
}
}
extern int cmdedit_read_input(int inputFd, int outputFd,
char command[BUFSIZ])
{
int nr = 0;
int len = 0;
int j = 0;
int cursor = 0;
int break_out = 0;
int ret = 0;
char c = 0;
struct history *hp = his_end;
memset(command, 0, sizeof(command));
parsenextc = command;
if (!reset_term) {
xioctl(inputFd, TCGETA, (void *) &old_term);
memcpy(&new_term, &old_term, sizeof(struct termio));
new_term.c_cc[VMIN] = 1;
new_term.c_cc[VTIME] = 0;
new_term.c_lflag &= ~ICANON; /* unbuffered input */
new_term.c_lflag &= ~ECHO;
xioctl(inputFd, TCSETA, (void *) &new_term);
reset_term = 1;
} else {
xioctl(inputFd, TCSETA, (void *) &new_term);
}
memset(parsenextc, 0, BUFSIZ);
while (1) {
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
switch (c) {
case 1: /* Control-A Beginning of line */
input_home(outputFd, &cursor);
break;
case 5: /* Control-E EOL */
input_end(outputFd, &cursor, len);
break;
case 4: /* Control-D */
if (cursor != len) {
input_delete(outputFd, cursor);
len--;
}
break;
case '\b': /* Backspace */
case DEL:
input_backspace(outputFd, &cursor, &len);
break;
case '\n': /* Enter */
*(parsenextc + len++ + 1) = c;
xwrite(outputFd, &c, 1);
break_out = 1;
break;
case ESC: /* escape sequence follows */
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
if (c == '[') { /* 91 */
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
switch (c) {
case 'A':
if (hp && hp->p) { /* Up */
hp = hp->p;
goto hop;
}
break;
case 'B':
if (hp && hp->n && hp->n->s) { /* Down */
hp = hp->n;
goto hop;
}
break;
hop: /* hop */
len = strlen(parsenextc);
for (; cursor > 0; cursor--) /* return to begining of line */
xwrite(outputFd, "\b", 1);
for (j = 0; j < len; j++) /* erase old command */
xwrite(outputFd, " ", 1);
for (j = len; j > 0; j--) /* return to begining of line */
xwrite(outputFd, "\b", 1);
strcpy(parsenextc, hp->s); /* write new command */
len = strlen(hp->s);
xwrite(outputFd, parsenextc, len);
cursor = len;
break;
case 'C': /* Right */
if (cursor < len) {
xwrite(outputFd, "\033[C", 3);
cursor++;
}
break;
case 'D': /* Left */
if (cursor > 0) {
xwrite(outputFd, "\033[D", 3);
cursor--;
}
break;
case '3': /* Delete */
if (cursor != len) {
input_delete(outputFd, cursor);
len--;
}
break;
case '1': /* Home (Ctrl-A) */
input_home(outputFd, &cursor);
break;
case '4': /* End (Ctrl-E) */
input_end(outputFd, &cursor, len);
break;
}
if (c == '1' || c == '3' || c == '4')
if ((ret = read(inputFd, &c, 1)) < 1)
return ret; /* read 126 (~) */
}
if (c == 'O') { /* 79 */
if ((ret = read(inputFd, &c, 1)) < 1)
return ret;
switch (c) {
case 'H': /* Home (xterm) */
input_home(outputFd, &cursor);
break;
case 'F': /* End (xterm) */
input_end(outputFd, &cursor, len);
break;
}
}
c = 0;
break;
default: /* If it's regular input, do the normal thing */
if (!isprint(c)) /* Skip non-printable characters */
break;
if (len >= (BUFSIZ - 2)) /* Need to leave space for enter */
break;
len++;
if (cursor == (len - 1)) { /* Append if at the end of the line */
*(parsenextc + cursor) = c;
} else { /* Insert otherwise */
memmove(parsenextc + cursor + 1, parsenextc + cursor,
len - cursor - 1);
*(parsenextc + cursor) = c;
for (j = cursor; j < len; j++)
xwrite(outputFd, parsenextc + j, 1);
for (; j > cursor; j--)
xwrite(outputFd, "\033[D", 3);
}
cursor++;
xwrite(outputFd, &c, 1);
break;
}
if (break_out) /* Enter is the command terminator, no more input. */
break;
}
nr = len + 1;
xioctl(inputFd, TCSETA, (void *) &old_term);
reset_term = 0;
if (*(parsenextc)) { /* Handle command history log */
struct history *h = his_end;
if (!h) { /* No previous history */
h = his_front = malloc(sizeof(struct history));
h->n = malloc(sizeof(struct history));
h->p = NULL;
h->s = strdup(parsenextc);
h->n->p = h;
h->n->n = NULL;
h->n->s = NULL;
his_end = h->n;
history_counter++;
} else { /* Add a new history command */
h->n = malloc(sizeof(struct history));
h->n->p = h;
h->n->n = NULL;
h->n->s = NULL;
h->s = strdup(parsenextc);
his_end = h->n;
if (history_counter >= MAX_HISTORY) { /* After max history, remove the last known command */
struct history *p = his_front->n;
p->p = NULL;
free(his_front->s);
free(his_front);
his_front = p;
} else {
history_counter++;
}
}
}
return nr;
}
extern void cmdedit_init(void)
{
atexit(cmdedit_reset_term);
signal(SIGINT, gotaSignal);
signal(SIGQUIT, gotaSignal);
signal(SIGTERM, gotaSignal);
}
#endif /* BB_FEATURE_SH_COMMAND_EDITING */

17
shell/cmdedit.h Normal file
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/*
* Termios command line History and Editting for NetBSD sh (ash)
* Copyright (c) 1999
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Adjusted for busybox: Erik Andersen <andersee@debian.org>
*
* You may use this code as you wish, so long as the original author(s)
* are attributed in any redistributions of the source code.
* This code is 'as is' with no warranty.
* This code may safely be consumed by a BSD or GPL license.
*
*/
extern int cmdedit_read_input(int inputFd, int outputFd, char command[BUFSIZ]);
extern void cmdedit_init(void);

583
test.c Normal file
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/* vi: set sw=4 ts=4: */
/*
* echo implementation for busybox
*
* Copyright (c) by a whole pile of folks:
*
* test(1); version 7-like -- author Erik Baalbergen
* modified by Eric Gisin to be used as built-in.
* modified by Arnold Robbins to add SVR3 compatibility
* (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
* modified by J.T. Conklin for NetBSD.
* modified by Herbert Xu to be used as built-in in ash.
* modified by Erik Andersen <andersee@debian.org> to be used
* in busybox.
*
* 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
*
* Original copyright notice states:
* "This program is in the Public Domain."
*/
#include "internal.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/* test(1) accepts the following grammar:
oexpr ::= aexpr | aexpr "-o" oexpr ;
aexpr ::= nexpr | nexpr "-a" aexpr ;
nexpr ::= primary | "!" primary
primary ::= unary-operator operand
| operand binary-operator operand
| operand
| "(" oexpr ")"
;
unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
"-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
"-nt"|"-ot"|"-ef";
operand ::= <any legal UNIX file name>
*/
enum token {
EOI,
FILRD,
FILWR,
FILEX,
FILEXIST,
FILREG,
FILDIR,
FILCDEV,
FILBDEV,
FILFIFO,
FILSOCK,
FILSYM,
FILGZ,
FILTT,
FILSUID,
FILSGID,
FILSTCK,
FILNT,
FILOT,
FILEQ,
FILUID,
FILGID,
STREZ,
STRNZ,
STREQ,
STRNE,
STRLT,
STRGT,
INTEQ,
INTNE,
INTGE,
INTGT,
INTLE,
INTLT,
UNOT,
BAND,
BOR,
LPAREN,
RPAREN,
OPERAND
};
enum token_types {
UNOP,
BINOP,
BUNOP,
BBINOP,
PAREN
};
struct t_op {
const char *op_text;
short op_num, op_type;
} const ops [] = {
{"-r", FILRD, UNOP},
{"-w", FILWR, UNOP},
{"-x", FILEX, UNOP},
{"-e", FILEXIST,UNOP},
{"-f", FILREG, UNOP},
{"-d", FILDIR, UNOP},
{"-c", FILCDEV,UNOP},
{"-b", FILBDEV,UNOP},
{"-p", FILFIFO,UNOP},
{"-u", FILSUID,UNOP},
{"-g", FILSGID,UNOP},
{"-k", FILSTCK,UNOP},
{"-s", FILGZ, UNOP},
{"-t", FILTT, UNOP},
{"-z", STREZ, UNOP},
{"-n", STRNZ, UNOP},
{"-h", FILSYM, UNOP}, /* for backwards compat */
{"-O", FILUID, UNOP},
{"-G", FILGID, UNOP},
{"-L", FILSYM, UNOP},
{"-S", FILSOCK,UNOP},
{"=", STREQ, BINOP},
{"!=", STRNE, BINOP},
{"<", STRLT, BINOP},
{">", STRGT, BINOP},
{"-eq", INTEQ, BINOP},
{"-ne", INTNE, BINOP},
{"-ge", INTGE, BINOP},
{"-gt", INTGT, BINOP},
{"-le", INTLE, BINOP},
{"-lt", INTLT, BINOP},
{"-nt", FILNT, BINOP},
{"-ot", FILOT, BINOP},
{"-ef", FILEQ, BINOP},
{"!", UNOT, BUNOP},
{"-a", BAND, BBINOP},
{"-o", BOR, BBINOP},
{"(", LPAREN, PAREN},
{")", RPAREN, PAREN},
{0, 0, 0}
};
char **t_wp;
struct t_op const *t_wp_op;
static gid_t *group_array = NULL;
static int ngroups;
static enum token t_lex();
static int oexpr();
static int aexpr();
static int nexpr();
static int binop();
static int primary();
static int filstat();
static int getn();
static int newerf();
static int olderf();
static int equalf();
static void syntax();
static int test_eaccess();
static int is_a_group_member();
static void initialize_group_array();
extern int
test_main(int argc, char** argv)
{
int res;
if (strcmp(argv[0], "[") == 0) {
if (strcmp(argv[--argc], "]"))
fatalError("missing ]");
argv[argc] = NULL;
}
/* Implement special cases from POSIX.2, section 4.62.4 */
switch (argc) {
case 1:
exit( 1);
case 2:
exit (*argv[1] == '\0');
case 3:
if (argv[1][0] == '!' && argv[1][1] == '\0') {
exit (!(*argv[2] == '\0'));
}
break;
case 4:
if (argv[1][0] != '!' || argv[1][1] != '\0') {
if (t_lex(argv[2]),
t_wp_op && t_wp_op->op_type == BINOP) {
t_wp = &argv[1];
exit (binop() == 0);
}
}
break;
case 5:
if (argv[1][0] == '!' && argv[1][1] == '\0') {
if (t_lex(argv[3]),
t_wp_op && t_wp_op->op_type == BINOP) {
t_wp = &argv[2];
exit (!(binop() == 0));
}
}
break;
}
t_wp = &argv[1];
res = !oexpr(t_lex(*t_wp));
if (*t_wp != NULL && *++t_wp != NULL)
syntax(*t_wp, "unknown operand");
exit( res);
}
static void
syntax(op, msg)
char *op;
char *msg;
{
if (op && *op)
fatalError("%s: %s", op, msg);
else
fatalError("%s", msg);
}
static int
oexpr(n)
enum token n;
{
int res;
res = aexpr(n);
if (t_lex(*++t_wp) == BOR)
return oexpr(t_lex(*++t_wp)) || res;
t_wp--;
return res;
}
static int
aexpr(n)
enum token n;
{
int res;
res = nexpr(n);
if (t_lex(*++t_wp) == BAND)
return aexpr(t_lex(*++t_wp)) && res;
t_wp--;
return res;
}
static int
nexpr(n)
enum token n; /* token */
{
if (n == UNOT)
return !nexpr(t_lex(*++t_wp));
return primary(n);
}
static int
primary(n)
enum token n;
{
int res;
if (n == EOI)
syntax(NULL, "argument expected");
if (n == LPAREN) {
res = oexpr(t_lex(*++t_wp));
if (t_lex(*++t_wp) != RPAREN)
syntax(NULL, "closing paren expected");
return res;
}
if (t_wp_op && t_wp_op->op_type == UNOP) {
/* unary expression */
if (*++t_wp == NULL)
syntax(t_wp_op->op_text, "argument expected");
switch (n) {
case STREZ:
return strlen(*t_wp) == 0;
case STRNZ:
return strlen(*t_wp) != 0;
case FILTT:
return isatty(getn(*t_wp));
default:
return filstat(*t_wp, n);
}
}
if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
return binop();
}
return strlen(*t_wp) > 0;
}
static int
binop()
{
const char *opnd1, *opnd2;
struct t_op const *op;
opnd1 = *t_wp;
(void) t_lex(*++t_wp);
op = t_wp_op;
if ((opnd2 = *++t_wp) == (char *)0)
syntax(op->op_text, "argument expected");
switch (op->op_num) {
case STREQ:
return strcmp(opnd1, opnd2) == 0;
case STRNE:
return strcmp(opnd1, opnd2) != 0;
case STRLT:
return strcmp(opnd1, opnd2) < 0;
case STRGT:
return strcmp(opnd1, opnd2) > 0;
case INTEQ:
return getn(opnd1) == getn(opnd2);
case INTNE:
return getn(opnd1) != getn(opnd2);
case INTGE:
return getn(opnd1) >= getn(opnd2);
case INTGT:
return getn(opnd1) > getn(opnd2);
case INTLE:
return getn(opnd1) <= getn(opnd2);
case INTLT:
return getn(opnd1) < getn(opnd2);
case FILNT:
return newerf (opnd1, opnd2);
case FILOT:
return olderf (opnd1, opnd2);
case FILEQ:
return equalf (opnd1, opnd2);
}
/* NOTREACHED */
return 1;
}
static int
filstat(nm, mode)
char *nm;
enum token mode;
{
struct stat s;
int i;
if (mode == FILSYM) {
#ifdef S_IFLNK
if (lstat(nm, &s) == 0) {
i = S_IFLNK;
goto filetype;
}
#endif
return 0;
}
if (stat(nm, &s) != 0)
return 0;
switch (mode) {
case FILRD:
return test_eaccess(nm, R_OK) == 0;
case FILWR:
return test_eaccess(nm, W_OK) == 0;
case FILEX:
return test_eaccess(nm, X_OK) == 0;
case FILEXIST:
return 1;
case FILREG:
i = S_IFREG;
goto filetype;
case FILDIR:
i = S_IFDIR;
goto filetype;
case FILCDEV:
i = S_IFCHR;
goto filetype;
case FILBDEV:
i = S_IFBLK;
goto filetype;
case FILFIFO:
#ifdef S_IFIFO
i = S_IFIFO;
goto filetype;
#else
return 0;
#endif
case FILSOCK:
#ifdef S_IFSOCK
i = S_IFSOCK;
goto filetype;
#else
return 0;
#endif
case FILSUID:
i = S_ISUID;
goto filebit;
case FILSGID:
i = S_ISGID;
goto filebit;
case FILSTCK:
i = S_ISVTX;
goto filebit;
case FILGZ:
return s.st_size > 0L;
case FILUID:
return s.st_uid == geteuid();
case FILGID:
return s.st_gid == getegid();
default:
return 1;
}
filetype:
return ((s.st_mode & S_IFMT) == i);
filebit:
return ((s.st_mode & i) != 0);
}
static enum token
t_lex(s)
char *s;
{
struct t_op const *op = ops;
if (s == 0) {
t_wp_op = (struct t_op *)0;
return EOI;
}
while (op->op_text) {
if (strcmp(s, op->op_text) == 0) {
t_wp_op = op;
return op->op_num;
}
op++;
}
t_wp_op = (struct t_op *)0;
return OPERAND;
}
/* atoi with error detection */
static int
getn(s)
char *s;
{
char *p;
long r;
errno = 0;
r = strtol(s, &p, 10);
if (errno != 0)
fatalError("%s: out of range", s);
while (isspace(*p))
p++;
if (*p)
fatalError("%s: bad number", s);
return (int) r;
}
static int
newerf (f1, f2)
char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_mtime > b2.st_mtime);
}
static int
olderf (f1, f2)
char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_mtime < b2.st_mtime);
}
static int
equalf (f1, f2)
char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_dev == b2.st_dev &&
b1.st_ino == b2.st_ino);
}
/* Do the same thing access(2) does, but use the effective uid and gid,
and don't make the mistake of telling root that any file is
executable. */
static int
test_eaccess (path, mode)
char *path;
int mode;
{
struct stat st;
int euid = geteuid();
if (stat (path, &st) < 0)
return (-1);
if (euid == 0) {
/* Root can read or write any file. */
if (mode != X_OK)
return (0);
/* Root can execute any file that has any one of the execute
bits set. */
if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
return (0);
}
if (st.st_uid == euid) /* owner */
mode <<= 6;
else if (is_a_group_member (st.st_gid))
mode <<= 3;
if (st.st_mode & mode)
return (0);
return (-1);
}
static void
initialize_group_array ()
{
ngroups = getgroups(0, NULL);
if ((group_array = realloc(group_array, ngroups * sizeof(gid_t))) == NULL)
fatalError("Out of space");
getgroups(ngroups, group_array);
}
/* Return non-zero if GID is one that we have in our groups list. */
static int
is_a_group_member (gid)
gid_t gid;
{
register int i;
/* Short-circuit if possible, maybe saving a call to getgroups(). */
if (gid == getgid() || gid == getegid())
return (1);
if (ngroups == 0)
initialize_group_array ();
/* Search through the list looking for GID. */
for (i = 0; i < ngroups; i++)
if (gid == group_array[i])
return (1);
return (0);
}