163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
/*
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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. 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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static 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 /* not lint */
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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 /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.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 "extern.h"
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int lflag, sflag;
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static void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct stat sb1, sb2;
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off_t skip1, skip2;
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int ch, fd1, fd2, special;
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char *file1, *file2;
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while ((ch = getopt(argc, argv, "-ls")) != -1)
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switch (ch) {
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case 'l': /* print all differences */
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lflag = 1;
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break;
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case 's': /* silent run */
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sflag = 1;
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break;
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case '-': /* stdin (must be after options) */
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--optind;
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goto endargs;
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case '?':
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default:
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usage();
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}
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endargs:
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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, "only one of -l and -s may be specified");
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if (argc < 2 || argc > 4)
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usage();
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/* Backward compatibility -- handle "-" meaning stdin. */
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special = 0;
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if (strcmp(file1 = argv[0], "-") == 0) {
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special = 1;
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fd1 = 0;
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file1 = "stdin";
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}
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else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) {
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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(1);
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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 = 1;
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fd2 = 0;
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file2 = "stdin";
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}
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else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) {
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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(1);
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}
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skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0;
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skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0;
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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(1);
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}
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if (!S_ISREG(sb1.st_mode))
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special = 1;
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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(1);
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}
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if (!S_ISREG(sb2.st_mode))
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special = 1;
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}
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}
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if (special)
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c_special(fd1, file1, skip1, fd2, file2, skip2);
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else
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c_regular(fd1, file1, skip1, sb1.st_size,
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fd2, file2, skip2, sb2.st_size);
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exit(0);
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}
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static void
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usage()
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{
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(void)fprintf(stderr,
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"usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
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exit(ERR_EXIT);
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}
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