424 lines
10 KiB
C
424 lines
10 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* John B. Roll Jr.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)xargs.c 5.11 (Berkeley) 6/19/91";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#if __minix
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#define _PATH_ECHO "/bin/echo"
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#else
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#include "pathnames.h"
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#endif
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#ifndef ARG_MAX
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#define ARG_MAX (sizeof(int) == 2 ? 4096 : 128 * 1024)
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#endif
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int exit_status = 0;
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int tflag;
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void err(const char *, ...);
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void run(char **argv);
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void usage(void);
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int main(int argc, char **argv)
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{
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extern int optind;
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extern char *optarg;
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register int ch;
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register char *p, *bbp, *ebp, **bxp, **exp, **xp;
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int cnt, indouble, insingle, nargs, nflag, nline, xflag, zflag;
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char **av, *argp;
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/*
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* POSIX.2 limits the exec line length to ARG_MAX - 2K. Running that
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* caused some E2BIG errors, so it was changed to ARG_MAX - 4K. Given
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* that the smallest argument is 2 bytes in length, this means that
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* the number of arguments is limited to:
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*
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* (ARG_MAX - 4K - LENGTH(utility + arguments)) / 2.
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*
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* We arbitrarily limit the number of arguments to 5000. This is
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* allowed by POSIX.2 as long as the resulting minimum exec line is
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* at least LINE_MAX. Realloc'ing as necessary is possible, but
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* probably not worthwhile.
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*/
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#if !__minix || __minix_vmd
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nargs = 5000;
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nline = ARG_MAX - 4 * 1024;
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#else
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/* Things are more cramped under standard Minix. */
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nargs = 80 * sizeof(int);
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nline = ARG_MAX - 512 * sizeof(int);
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#endif
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nflag = xflag = zflag = 0;
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while ((ch = getopt(argc, argv, "n:s:tx0")) != EOF)
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switch(ch) {
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case 'n':
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nflag = 1;
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if ((nargs = atoi(optarg)) <= 0)
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err("illegal argument count");
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break;
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case 's':
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nline = atoi(optarg);
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break;
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case 't':
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tflag = 1;
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break;
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case 'x':
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xflag = 1;
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break;
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case '0':
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zflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (xflag && !nflag)
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usage();
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/*
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* Allocate pointers for the utility name, the utility arguments,
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* the maximum arguments to be read from stdin and the trailing
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* NULL.
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*/
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if (!(av = bxp =
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malloc((u_int)(1 + argc + nargs + 1) * sizeof(char **))))
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err("%s", strerror(errno));
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/*
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* Use the user's name for the utility as argv[0], just like the
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* shell. Echo is the default. Set up pointers for the user's
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* arguments.
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*/
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if (!*argv)
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cnt = strlen(*bxp++ = _PATH_ECHO);
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else {
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cnt = 0;
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do {
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cnt += strlen(*bxp++ = *argv) + 1;
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} while (*++argv);
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}
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/*
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* Set up begin/end/traversing pointers into the array. The -n
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* count doesn't include the trailing NULL pointer, so the malloc
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* added in an extra slot.
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*/
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exp = (xp = bxp) + nargs;
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/*
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* Allocate buffer space for the arguments read from stdin and the
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* trailing NULL. Buffer space is defined as the default or specified
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* space, minus the length of the utility name and arguments. Set up
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* begin/end/traversing pointers into the array. The -s count does
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* include the trailing NULL, so the malloc didn't add in an extra
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* slot.
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*/
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nline -= cnt;
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if (nline <= 0)
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err("insufficient space for command");
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if (!(bbp = malloc((u_int)nline + 1)))
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err("%s", strerror(errno));
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ebp = (argp = p = bbp) + nline - 1;
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if (zflag) {
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/* Read pathnames terminated by null bytes as produced by
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* find ... -print0. No comments in this code, see further
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* below.
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*/
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for (;;)
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switch(ch = getchar()) {
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case EOF:
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if (p == bbp)
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exit(exit_status);
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if (argp == p) {
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*xp = NULL;
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run(av);
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exit(exit_status);
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}
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/*FALL THROUGH*/
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case '\0':
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if (argp == p)
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continue;
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*p = '\0';
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*xp++ = argp;
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if (xp == exp || p == ebp || ch == EOF) {
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if (xflag && xp != exp && p == ebp)
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err(
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"insufficient space for arguments");
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*xp = NULL;
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run(av);
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if (ch == EOF)
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exit(exit_status);
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p = bbp;
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xp = bxp;
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} else
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++p;
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argp = p;
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break;
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default:
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if (p < ebp) {
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*p++ = ch;
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break;
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}
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if (bxp == xp)
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err("insufficient space for argument");
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if (xflag)
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err("insufficient space for arguments");
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*xp = NULL;
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run(av);
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xp = bxp;
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cnt = ebp - argp;
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bcopy(argp, bbp, cnt);
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p = (argp = bbp) + cnt;
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*p++ = ch;
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break;
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}
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/* NOTREACHED */
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}
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for (insingle = indouble = 0;;)
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switch(ch = getchar()) {
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case EOF:
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/* No arguments since last exec. */
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if (p == bbp)
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exit(exit_status);
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/* Nothing since end of last argument. */
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if (argp == p) {
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*xp = NULL;
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run(av);
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exit(exit_status);
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}
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goto arg1;
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case ' ':
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case '\t':
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/* Quotes escape tabs and spaces. */
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if (insingle || indouble)
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goto addch;
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goto arg2;
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case '\n':
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/* Empty lines are skipped. */
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if (argp == p)
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continue;
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/* Quotes do not escape newlines. */
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arg1: if (insingle || indouble)
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err("unterminated quote");
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arg2: *p = '\0';
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*xp++ = argp;
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/*
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* If max'd out on args or buffer, or reached EOF,
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* run the command. If xflag and max'd out on buffer
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* but not on args, object.
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*/
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if (xp == exp || p == ebp || ch == EOF) {
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if (xflag && xp != exp && p == ebp)
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err("insufficient space for arguments");
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*xp = NULL;
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run(av);
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if (ch == EOF)
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exit(exit_status);
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p = bbp;
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xp = bxp;
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} else
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++p;
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argp = p;
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break;
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case '\'':
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if (indouble)
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goto addch;
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insingle = !insingle;
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break;
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case '"':
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if (insingle)
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goto addch;
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indouble = !indouble;
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break;
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case '\\':
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/* Backslash escapes anything, is escaped by quotes. */
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if (!insingle && !indouble && (ch = getchar()) == EOF)
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err("backslash at EOF");
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/* FALLTHROUGH */
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default:
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addch: if (p < ebp) {
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*p++ = ch;
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break;
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}
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/* If only one argument, not enough buffer space. */
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if (bxp == xp)
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err("insufficient space for argument");
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/* Didn't hit argument limit, so if xflag object. */
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if (xflag)
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err("insufficient space for arguments");
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*xp = NULL;
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run(av);
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xp = bxp;
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cnt = ebp - argp;
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bcopy(argp, bbp, cnt);
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p = (argp = bbp) + cnt;
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*p++ = ch;
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break;
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}
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/* NOTREACHED */
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}
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void run(char **argv)
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{
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register char **p;
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pid_t pid;
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int noinvoke;
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int status;
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int pfd[2];
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if (tflag) {
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(void)fprintf(stderr, "%s", *argv);
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for (p = argv + 1; *p; ++p)
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(void)fprintf(stderr, " %s", *p);
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(void)fprintf(stderr, "\n");
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(void)fflush(stderr);
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}
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if (pipe(pfd) < 0) err("pipe: %s", strerror(errno));
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switch(pid = fork()) {
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case -1:
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err("fork: %s", strerror(errno));
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case 0:
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close(pfd[0]);
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fcntl(pfd[1], F_SETFD, fcntl(pfd[1], F_GETFD) | FD_CLOEXEC);
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execvp(argv[0], argv);
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noinvoke = (errno == ENOENT) ? 127 : 126;
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(void)fprintf(stderr,
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"xargs: %s exec failed: %s.\n", argv[0], strerror(errno));
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/* Modern way of returning noinvoke instead of a dirty vfork()
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* trick: (kjb)
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*/
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write(pfd[1], &noinvoke, sizeof(noinvoke));
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_exit(-1);
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}
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close(pfd[1]);
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if (read(pfd[0], &noinvoke, sizeof(noinvoke)) < sizeof(noinvoke))
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noinvoke = 0;
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close(pfd[0]);
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pid = waitpid(pid, &status, 0);
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if (pid == -1)
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err("waitpid: %s", strerror(errno));
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/*
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* If we couldn't invoke the utility or the utility didn't exit
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* properly, quit with 127 or 126 respectively.
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*/
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if (noinvoke)
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exit(noinvoke);
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/*
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* According to POSIX, we have to exit if the utility exits with
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* a 255 status, or is interrupted by a signal. xargs is allowed
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* to return any exit status between 1 and 125 in these cases, but
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* we'll use 124 and 125, the same values used by GNU xargs.
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*/
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if (WIFEXITED(status)) {
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if (WEXITSTATUS (status) == 255) {
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fprintf (stderr, "xargs: %s exited with status 255\n",
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argv[0]);
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exit(124);
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} else if (WEXITSTATUS (status) != 0) {
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exit_status = 123;
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}
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} else if (WIFSTOPPED (status)) {
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fprintf (stderr, "xargs: %s terminated by signal %d\n",
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argv[0], WSTOPSIG (status));
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exit(125);
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} else if (WIFSIGNALED (status)) {
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fprintf (stderr, "xargs: %s terminated by signal %d\n",
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argv[0], WTERMSIG (status));
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exit(125);
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}
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}
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void usage(void)
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{
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(void)fprintf(stderr,
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"usage: xargs [-t0] [[-x] -n number] [-s size] [utility [argument ...]]\n");
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exit(1);
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}
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void err(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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(void)fprintf(stderr, "xargs: ");
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void)fprintf(stderr, "\n");
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exit(1);
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/* NOTREACHED */
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}
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