MFC after: 1 week Sponsored by: Klara, Inc. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D38280
280 lines
6.7 KiB
C
280 lines
6.7 KiB
C
/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1987, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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. 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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static const char copyright[] =
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"@(#) Copyright (c) 1987, 1990, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
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#endif
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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/types.h>
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#include <sys/stat.h>
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#include <capsicum_helpers.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 <getopt.h>
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#include <nl_types.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 <libutil.h>
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#include "extern.h"
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bool bflag, lflag, sflag, xflag, zflag;
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static const struct option long_opts[] =
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{
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{"print-bytes", no_argument, NULL, 'b'},
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{"ignore-initial", required_argument, NULL, 'i'},
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{"verbose", no_argument, NULL, 'l'},
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{"bytes", required_argument, NULL, 'n'},
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{"silent", no_argument, NULL, 's'},
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{"quiet", no_argument, NULL, 's'},
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{NULL, no_argument, NULL, 0}
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};
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#ifdef SIGINFO
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volatile sig_atomic_t info;
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static void
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siginfo(int signo)
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{
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info = signo;
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}
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#endif
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static void usage(void);
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static bool
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parse_iskipspec(char *spec, off_t *skip1, off_t *skip2)
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{
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char *colon;
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colon = strchr(spec, ':');
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if (colon != NULL)
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*colon++ = '\0';
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if (expand_number(spec, skip1) < 0)
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return (false);
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if (colon != NULL)
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return (expand_number(colon, skip2) == 0);
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*skip2 = *skip1;
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return (true);
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}
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int
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main(int argc, char *argv[])
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{
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struct stat sb1, sb2;
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off_t skip1, skip2, limit;
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int ch, fd1, fd2, oflag;
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bool special;
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const char *file1, *file2;
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limit = skip1 = skip2 = 0;
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oflag = O_RDONLY;
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while ((ch = getopt_long(argc, argv, "+bhi:ln:sxz", long_opts, NULL)) != -1)
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switch (ch) {
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case 'b': /* Print bytes */
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bflag = true;
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break;
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case 'h': /* Don't follow symlinks */
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oflag |= O_NOFOLLOW;
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break;
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case 'i':
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if (!parse_iskipspec(optarg, &skip1, &skip2)) {
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fprintf(stderr,
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"Invalid --ignore-initial: %s\n",
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optarg);
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usage();
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}
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break;
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case 'l': /* print all differences */
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lflag = true;
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break;
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case 'n': /* Limit */
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if (expand_number(optarg, &limit) < 0 || limit < 0) {
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fprintf(stderr, "Invalid --bytes: %s\n",
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optarg);
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usage();
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}
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break;
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case 's': /* silent run */
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sflag = true;
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break;
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case 'x': /* hex output */
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lflag = true;
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xflag = true;
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break;
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case 'z': /* compare size first */
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zflag = true;
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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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argv += optind;
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argc -= optind;
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if (lflag && sflag)
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errx(ERR_EXIT, "specifying -s with -l or -x is not permitted");
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if (argc < 2 || argc > 4)
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usage();
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/* Don't limit rights on stdin since it may be one of the inputs. */
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if (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF))
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err(ERR_EXIT, "unable to limit rights on stdout");
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if (caph_limit_stream(STDERR_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF))
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err(ERR_EXIT, "unable to limit rights on stderr");
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/* Backward compatibility -- handle "-" meaning stdin. */
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special = false;
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if (strcmp(file1 = argv[0], "-") == 0) {
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special = true;
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fd1 = STDIN_FILENO;
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file1 = "stdin";
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} else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) {
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if (!sflag)
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err(ERR_EXIT, "%s", file1);
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else
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exit(ERR_EXIT);
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}
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if (strcmp(file2 = argv[1], "-") == 0) {
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if (special)
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errx(ERR_EXIT,
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"standard input may only be specified once");
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special = true;
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fd2 = STDIN_FILENO;
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file2 = "stdin";
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} else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) {
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if (!sflag)
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err(ERR_EXIT, "%s", file2);
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else
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exit(ERR_EXIT);
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}
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if (argc > 2 && expand_number(argv[2], &skip1) < 0) {
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fprintf(stderr, "Invalid skip1: %s\n", argv[2]);
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usage();
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}
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if (argc == 4 && expand_number(argv[3], &skip2) < 0) {
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fprintf(stderr, "Invalid skip2: %s\n", argv[3]);
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usage();
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}
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if (sflag && skip1 == 0 && skip2 == 0)
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zflag = true;
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if (fd1 == -1) {
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if (fd2 == -1) {
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c_link(file1, skip1, file2, skip2, limit);
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exit(0);
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} else if (!sflag)
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errx(ERR_EXIT, "%s: Not a symbolic link", file2);
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else
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exit(ERR_EXIT);
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} else if (fd2 == -1) {
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if (!sflag)
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errx(ERR_EXIT, "%s: Not a symbolic link", file1);
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else
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exit(ERR_EXIT);
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}
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/* FD rights are limited in c_special() and c_regular(). */
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caph_cache_catpages();
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if (!special) {
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if (fstat(fd1, &sb1)) {
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if (!sflag)
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err(ERR_EXIT, "%s", file1);
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else
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exit(ERR_EXIT);
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}
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if (!S_ISREG(sb1.st_mode))
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special = true;
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else {
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if (fstat(fd2, &sb2)) {
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if (!sflag)
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err(ERR_EXIT, "%s", file2);
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else
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exit(ERR_EXIT);
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}
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if (!S_ISREG(sb2.st_mode))
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special = true;
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}
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}
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#ifdef SIGINFO
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(void)signal(SIGINFO, siginfo);
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#endif
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if (special)
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c_special(fd1, file1, skip1, fd2, file2, skip2, limit);
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else {
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if (zflag && sb1.st_size != sb2.st_size) {
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if (!sflag)
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(void) printf("%s %s differ: size\n",
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file1, file2);
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exit(DIFF_EXIT);
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}
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c_regular(fd1, file1, skip1, sb1.st_size,
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fd2, file2, skip2, sb2.st_size, limit);
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}
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n");
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exit(ERR_EXIT);
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}
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