NetBSD/usr.bin/cmp/cmp.c

159 lines
4.2 KiB
C
Raw Normal View History

1997-01-09 23:18:21 +03:00
/* $NetBSD: cmp.c,v 1.9 1997/01/09 20:18:28 tls Exp $ */
1995-09-08 07:22:54 +04:00
1993-03-21 12:45:37 +03:00
/*
1995-09-08 07:22:54 +04:00
* Copyright (c) 1987, 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
1993-03-21 12:45:37 +03:00
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
1995-09-08 07:22:54 +04:00
static char copyright[] =
"@(#) Copyright (c) 1987, 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
1993-03-21 12:45:37 +03:00
#endif /* not lint */
#ifndef lint
1995-09-08 07:22:54 +04:00
#if 0
static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
#else
1997-01-09 23:18:21 +03:00
static char rcsid[] = "$NetBSD: cmp.c,v 1.9 1997/01/09 20:18:28 tls Exp $";
1995-09-08 07:22:54 +04:00
#endif
1993-03-21 12:45:37 +03:00
#endif /* not lint */
1995-09-08 07:22:54 +04:00
#include <sys/types.h>
1993-03-21 12:45:37 +03:00
#include <sys/stat.h>
1995-09-08 07:22:54 +04:00
#include <err.h>
#include <fcntl.h>
1993-03-21 12:45:37 +03:00
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
1995-09-08 07:22:54 +04:00
#include <locale.h>
1993-03-21 12:45:37 +03:00
1995-09-08 07:22:54 +04:00
#include "extern.h"
1993-03-21 12:45:37 +03:00
1995-09-08 07:22:54 +04:00
int lflag, sflag;
1995-09-08 07:22:54 +04:00
static void usage __P((void));
1993-03-21 12:45:37 +03:00
int
1993-03-21 12:45:37 +03:00
main(argc, argv)
int argc;
1995-09-08 07:22:54 +04:00
char *argv[];
1993-03-21 12:45:37 +03:00
{
1995-09-08 07:22:54 +04:00
struct stat sb1, sb2;
off_t skip1, skip2;
int ch, fd1, fd2, special;
char *file1, *file2;
setlocale(LC_ALL, "");
1993-03-21 12:45:37 +03:00
1995-09-08 07:22:54 +04:00
while ((ch = getopt(argc, argv, "ls")) != EOF)
1993-03-21 12:45:37 +03:00
switch (ch) {
case 'l': /* print all differences */
1995-09-08 07:22:54 +04:00
lflag = 1;
1993-03-21 12:45:37 +03:00
break;
case 's': /* silent run */
1995-09-08 07:22:54 +04:00
sflag = 1;
1993-03-21 12:45:37 +03:00
break;
case '?':
default:
usage();
}
1995-09-08 07:22:54 +04:00
endargs:
1993-03-21 12:45:37 +03:00
argv += optind;
argc -= optind;
1995-09-08 07:22:54 +04:00
if (lflag && sflag)
errx(ERR_EXIT, "only one of -l and -s may be specified");
1993-03-21 12:45:37 +03:00
if (argc < 2 || argc > 4)
usage();
1995-09-08 07:22:54 +04:00
/* Backward compatibility -- handle "-" meaning stdin. */
special = 0;
if (strcmp(file1 = argv[0], "-") == 0) {
special = 1;
1993-03-21 12:45:37 +03:00
fd1 = 0;
1995-09-08 07:22:54 +04:00
file1 = "stdin";
}
else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) {
if (!sflag)
warn("%s", file1);
exit(ERR_EXIT);
}
1995-09-08 07:22:54 +04:00
if (strcmp(file2 = argv[1], "-") == 0) {
if (special)
errx(ERR_EXIT,
"standard input may only be specified once");
special = 1;
1993-03-21 12:45:37 +03:00
fd2 = 0;
1995-09-08 07:22:54 +04:00
file2 = "stdin";
1993-03-21 12:45:37 +03:00
}
else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) {
if (!sflag)
warn("%s", file2);
exit(ERR_EXIT);
}
1995-09-08 07:22:54 +04:00
skip1 = argc > 2 ? strtoq(argv[2], NULL, 10) : 0;
skip2 = argc == 4 ? strtoq(argv[3], NULL, 10) : 0;
if (!special) {
if (fstat(fd1, &sb1))
err(ERR_EXIT, "%s", file1);
if (!S_ISREG(sb1.st_mode))
special = 1;
else {
if (fstat(fd2, &sb2))
err(ERR_EXIT, "%s", file2);
if (!S_ISREG(sb2.st_mode))
special = 1;
1993-03-21 12:45:37 +03:00
}
}
1995-09-08 07:22:54 +04:00
if (special)
c_special(fd1, file1, skip1, fd2, file2, skip2);
else
c_regular(fd1, file1, skip1, sb1.st_size,
fd2, file2, skip2, sb2.st_size);
exit(0);
1993-03-21 12:45:37 +03:00
}
1995-09-08 07:22:54 +04:00
static void
1993-03-21 12:45:37 +03:00
usage()
{
1995-09-08 07:22:54 +04:00
(void)fprintf(stderr,
"usage: cmp [-l | s] file1 file2 [skip1 [skip2]]\n");
exit(ERR_EXIT);
1993-03-21 12:45:37 +03:00
}