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627 lines
15 KiB
C
627 lines
15 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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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* $xMach: xargs.c,v 1.6 2002/02/23 05:27:47 tim Exp $
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*/
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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1990, 1993\n\
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The Regents of the University of California. 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 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <paths.h>
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#include <regex.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 "pathnames.h"
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static void parse_input(int, char *[]);
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static void prerun(int, char *[]);
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static int prompt(void);
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static void run(char **);
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static void usage(void);
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void strnsubst(char **, const char *, const char *, size_t);
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static void waitchildren(const char *, int);
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static char echo[] = _PATH_ECHO;
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static char **av, **bxp, **ep, **endxp, **xp;
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static char *argp, *bbp, *ebp, *inpline, *p, *replstr;
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static const char *eofstr;
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static int count, insingle, indouble, oflag, pflag, tflag, Rflag, rval, zflag;
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static int cnt, Iflag, jfound, Lflag, Sflag, wasquoted, xflag;
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static int curprocs, maxprocs;
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static volatile int childerr;
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extern char **environ;
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int
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main(int argc, char *argv[])
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{
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long arg_max;
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int ch, Jflag, nargs, nflag, nline;
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size_t linelen;
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char *endptr;
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inpline = replstr = NULL;
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ep = environ;
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eofstr = "";
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Jflag = nflag = 0;
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(void)setlocale(LC_ALL, "");
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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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nargs = 5000;
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if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
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errx(1, "sysconf(_SC_ARG_MAX) failed");
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nline = arg_max - 4 * 1024;
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while (*ep != NULL) {
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/* 1 byte for each '\0' */
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nline -= strlen(*ep++) + 1 + sizeof(*ep);
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}
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maxprocs = 1;
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while ((ch = getopt(argc, argv, "0E:I:J:L:n:oP:pR:S:s:rtx")) != -1)
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switch (ch) {
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case 'E':
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eofstr = optarg;
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break;
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case 'I':
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Jflag = 0;
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Iflag = 1;
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Lflag = 1;
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replstr = optarg;
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break;
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case 'J':
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Iflag = 0;
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Jflag = 1;
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replstr = optarg;
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break;
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case 'L':
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Lflag = atoi(optarg);
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break;
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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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errx(1, "illegal argument count");
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break;
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case 'o':
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oflag = 1;
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break;
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case 'P':
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if ((maxprocs = atoi(optarg)) <= 0)
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errx(1, "max. processes must be >0");
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break;
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case 'p':
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pflag = 1;
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break;
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case 'R':
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Rflag = strtol(optarg, &endptr, 10);
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if (*endptr != '\0')
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errx(1, "replacements must be a number");
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break;
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case 'r':
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/* GNU compatibility */
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break;
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case 'S':
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Sflag = strtoul(optarg, &endptr, 10);
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if (*endptr != '\0')
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errx(1, "replsize must be a number");
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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 (!Iflag && Rflag)
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usage();
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if (!Iflag && Sflag)
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usage();
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if (Iflag && !Rflag)
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Rflag = 5;
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if (Iflag && !Sflag)
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Sflag = 255;
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if (xflag && !nflag)
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usage();
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if (Iflag || Lflag)
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xflag = 1;
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if (replstr != NULL && *replstr == '\0')
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errx(1, "replstr may not be empty");
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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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linelen = 1 + argc + nargs + 1;
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if ((av = bxp = malloc(linelen * sizeof(char **))) == NULL)
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errx(1, "malloc failed");
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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 == NULL)
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cnt = strlen(*bxp++ = echo);
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else {
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do {
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if (Jflag && strcmp(*argv, replstr) == 0) {
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char **avj;
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jfound = 1;
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argv++;
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for (avj = argv; *avj; avj++)
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cnt += strlen(*avj) + 1;
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break;
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}
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cnt += strlen(*bxp++ = *argv) + 1;
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} while (*++argv != NULL);
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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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endxp = (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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errx(1, "insufficient space for command");
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if ((bbp = malloc((size_t)(nline + 1))) == NULL)
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errx(1, "malloc failed");
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ebp = (argp = p = bbp) + nline - 1;
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for (;;)
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parse_input(argc, argv);
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}
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static void
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parse_input(int argc, char *argv[])
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{
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int ch, foundeof;
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char **avj;
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foundeof = 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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waitchildren(*argv, 1);
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exit(rval);
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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 || zflag)
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goto addch;
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goto arg2;
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case '\0':
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if (zflag) {
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/*
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* Increment 'count', so that nulls will be treated
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* as end-of-line, as well as end-of-argument. This
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* is needed so -0 works properly with -I and -L.
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*/
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count++;
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goto arg2;
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}
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goto addch;
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case '\n':
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if (zflag)
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goto addch;
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count++; /* Indicate end-of-line (used by -L) */
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/* Quotes do not escape newlines. */
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arg1: if (insingle || indouble)
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errx(1, "unterminated quote");
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arg2:
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foundeof = *eofstr != '\0' &&
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strncmp(argp, eofstr, p - argp) == 0;
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/* Do not make empty args unless they are quoted */
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if ((argp != p || wasquoted) && !foundeof) {
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*p++ = '\0';
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*xp++ = argp;
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if (Iflag) {
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size_t curlen;
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if (inpline == NULL)
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curlen = 0;
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else {
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/*
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* If this string is not zero
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* length, append a space for
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* separation before the next
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* argument.
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*/
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if ((curlen = strlen(inpline)))
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strcat(inpline, " ");
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}
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curlen++;
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/*
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* Allocate enough to hold what we will
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* be holding in a second, and to append
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* a space next time through, if we have
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* to.
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*/
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inpline = realloc(inpline, curlen + 2 +
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strlen(argp));
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if (inpline == NULL)
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errx(1, "realloc failed");
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if (curlen == 1)
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strcpy(inpline, argp);
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else
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strcat(inpline, argp);
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}
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}
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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. Having reached the limit
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* of input lines, as specified by -L is the same as
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* maxing out on arguments.
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*/
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if (xp == endxp || p > ebp || ch == EOF ||
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(Lflag <= count && xflag) || foundeof) {
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if (xflag && xp != endxp && p > ebp)
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errx(1, "insufficient space for arguments");
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if (jfound) {
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for (avj = argv; *avj; avj++)
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*xp++ = *avj;
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}
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prerun(argc, av);
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if (ch == EOF || foundeof) {
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waitchildren(*argv, 1);
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exit(rval);
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}
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p = bbp;
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xp = bxp;
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count = 0;
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}
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argp = p;
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wasquoted = 0;
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break;
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case '\'':
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if (indouble || zflag)
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goto addch;
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insingle = !insingle;
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wasquoted = 1;
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break;
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case '"':
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if (insingle || zflag)
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goto addch;
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indouble = !indouble;
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wasquoted = 1;
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break;
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case '\\':
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if (zflag)
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goto addch;
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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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errx(1, "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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errx(1, "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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errx(1, "insufficient space for arguments");
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if (jfound) {
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for (avj = argv; *avj; avj++)
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*xp++ = *avj;
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}
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prerun(argc, av);
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xp = bxp;
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cnt = ebp - argp;
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memcpy(bbp, argp, (size_t)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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}
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/*
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* Do things necessary before run()'ing, such as -I substitution,
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* and then call run().
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*/
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static void
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prerun(int argc, char *argv[])
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{
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char **tmp, **tmp2, **avj;
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int repls;
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repls = Rflag;
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if (argc == 0 || repls == 0) {
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*xp = NULL;
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run(argv);
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return;
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}
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avj = argv;
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/*
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* Allocate memory to hold the argument list, and
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* a NULL at the tail.
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*/
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tmp = malloc((argc + 1) * sizeof(char**));
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if (tmp == NULL)
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errx(1, "malloc failed");
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tmp2 = tmp;
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/*
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* Save the first argument and iterate over it, we
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* cannot do strnsubst() to it.
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*/
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if ((*tmp++ = strdup(*avj++)) == NULL)
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errx(1, "strdup failed");
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/*
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* For each argument to utility, if we have not used up
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* the number of replacements we are allowed to do, and
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* if the argument contains at least one occurrence of
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* replstr, call strnsubst(), else just save the string.
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* Iterations over elements of avj and tmp are done
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* where appropriate.
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*/
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while (--argc) {
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*tmp = *avj++;
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if (repls && strstr(*tmp, replstr) != NULL) {
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strnsubst(tmp++, replstr, inpline, (size_t)Sflag);
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if (repls > 0)
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repls--;
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} else {
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if ((*tmp = strdup(*tmp)) == NULL)
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errx(1, "strdup failed");
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tmp++;
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}
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}
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/*
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* Run it.
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*/
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*tmp = NULL;
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run(tmp2);
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/*
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* Walk from the tail to the head, free along the way.
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*/
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for (; tmp2 != tmp; tmp--)
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free(*tmp);
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/*
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* Now free the list itself.
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*/
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free(tmp2);
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/*
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* Free the input line buffer, if we have one.
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*/
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if (inpline != NULL) {
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free(inpline);
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inpline = NULL;
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}
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}
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static void
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run(char **argv)
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{
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pid_t pid;
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int fd;
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char **avec;
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/*
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* If the user wants to be notified of each command before it is
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* executed, notify them. If they want the notification to be
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* followed by a prompt, then prompt them.
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*/
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if (tflag || pflag) {
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(void)fprintf(stderr, "%s", *argv);
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for (avec = argv + 1; *avec != NULL; ++avec)
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(void)fprintf(stderr, " %s", *avec);
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/*
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* If the user has asked to be prompted, do so.
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*/
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if (pflag)
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/*
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* If they asked not to exec, return without execution
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* but if they asked to, go to the execution. If we
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* could not open their tty, break the switch and drop
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* back to -t behaviour.
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*/
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switch (prompt()) {
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case 0:
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return;
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case 1:
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goto exec;
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case 2:
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break;
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}
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(void)fprintf(stderr, "\n");
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(void)fflush(stderr);
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}
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exec:
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childerr = 0;
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switch (pid = vfork()) {
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case -1:
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err(1, "vfork");
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|
case 0:
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|
if (oflag) {
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if ((fd = open(_PATH_TTY, O_RDONLY)) == -1)
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|
err(1, "can't open /dev/tty");
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} else {
|
|
fd = open(_PATH_DEVNULL, O_RDONLY);
|
|
}
|
|
if (fd > STDIN_FILENO) {
|
|
if (dup2(fd, STDIN_FILENO) != 0)
|
|
err(1, "can't dup2 to stdin");
|
|
close(fd);
|
|
}
|
|
execvp(argv[0], argv);
|
|
childerr = errno;
|
|
_exit(1);
|
|
}
|
|
curprocs++;
|
|
waitchildren(*argv, 0);
|
|
}
|
|
|
|
static void
|
|
waitchildren(const char *name, int waitall)
|
|
{
|
|
pid_t pid;
|
|
int status;
|
|
|
|
while ((pid = waitpid(-1, &status, !waitall && curprocs < maxprocs ?
|
|
WNOHANG : 0)) > 0) {
|
|
curprocs--;
|
|
/* If we couldn't invoke the utility, exit. */
|
|
if (childerr != 0) {
|
|
errno = childerr;
|
|
err(errno == ENOENT ? 127 : 126, "%s", name);
|
|
}
|
|
/*
|
|
* If utility signaled or exited with a value of 255,
|
|
* exit 1-125.
|
|
*/
|
|
if (WIFSIGNALED(status) || WEXITSTATUS(status) == 255)
|
|
exit(1);
|
|
if (WEXITSTATUS(status))
|
|
rval = 1;
|
|
}
|
|
if (pid == -1 && errno != ECHILD)
|
|
err(1, "wait3");
|
|
}
|
|
|
|
/*
|
|
* Prompt the user about running a command.
|
|
*/
|
|
static int
|
|
prompt(void)
|
|
{
|
|
regex_t cre;
|
|
size_t rsize;
|
|
int match;
|
|
char *response;
|
|
FILE *ttyfp;
|
|
|
|
if ((ttyfp = fopen(_PATH_TTY, "r")) == NULL)
|
|
return (2); /* Indicate that the TTY failed to open. */
|
|
(void)fprintf(stderr, "?...");
|
|
(void)fflush(stderr);
|
|
if ((response = fgetln(ttyfp, &rsize)) == NULL ||
|
|
regcomp(&cre, nl_langinfo(YESEXPR), REG_BASIC) != 0) {
|
|
(void)fclose(ttyfp);
|
|
return (0);
|
|
}
|
|
response[rsize - 1] = '\0';
|
|
match = regexec(&cre, response, 0, NULL, 0);
|
|
(void)fclose(ttyfp);
|
|
regfree(&cre);
|
|
return (match == 0);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr,
|
|
"usage: xargs [-0opt] [-E eofstr] [-I replstr [-R replacements] [-S replsize]]\n"
|
|
" [-J replstr] [-L number] [-n number [-x]] [-P maxprocs]\n"
|
|
" [-s size] [utility [argument ...]]\n");
|
|
exit(1);
|
|
}
|