gno/bin/cmp/cmp.c

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/*
* Copyright (c) 1987, 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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.
*/
/*
* cmp for GNO/ME v2.0.6
*
* $Id: cmp.c,v 1.1 1997/10/03 05:13:22 gdr Exp $
*/
#ifndef __GNO__
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1987, 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#endif
#ifndef __GNO__
#ifndef lint
static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
#endif /* not lint */
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
int lflag, sflag;
#ifdef __GNO__
int rflag;
#endif
static void usage __P((void));
#ifdef __STACK_CHECK__
#include <gno/gno.h>
static void cleanup(void)
{
(void) fprintf(stderr, "%d\n", _endStackCheck());
}
#endif
int
#ifndef __STDC__
main(argc, argv)
int argc;
char *argv[];
#else
main(int argc, char *argv[])
#endif
{
struct stat sb1, sb2;
off_t skip1, skip2;
int ch, fd1, fd2, special;
char *file1, *file2;
#ifdef __STACK_CHECK__
atexit(cleanup);
_beginStackCheck();
#endif
#ifdef __GNO__
while ((ch = getopt(argc, argv, "-lsr")) != -1)
#else
while ((ch = getopt(argc, argv, "-ls")) != -1)
#endif
switch (ch) {
case 'l': /* print all differences */
lflag = 1;
break;
case 's': /* silent run */
sflag = 1;
break;
#ifdef __GNO__
case 'r':
rflag = 1; /* ignore resource fork */
break;
#endif
case '-': /* stdin (must be after options) */
--optind;
goto endargs;
case '?':
default:
usage();
}
endargs:
#ifndef __ORCAC__
argv += optind;
#else
argv = argv + optind;
#endif
argc -= optind;
if (lflag && sflag)
errx(ERR_EXIT, "only one of -l and -s may be specified");
if (argc < 2 || argc > 4)
usage();
/* Backward compatibility -- handle "-" meaning stdin. */
special = 0;
if (strcmp(file1 = argv[0], "-") == 0) {
special = 1;
fd1 = 0;
file1 = "stdin";
}
#ifndef __GNO__
else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) {
#else
/* open() for GNO/ME requires 3rd arg iff creating file */
else if ((fd1 = open(file1, O_RDONLY)) < 0) {
#endif
if (!sflag)
err(ERR_EXIT, "%s", file1);
else
exit(1);
}
if (strcmp(file2 = argv[1], "-") == 0) {
if (special)
errx(ERR_EXIT,
"standard input may only be specified once");
special = 1;
fd2 = 0;
file2 = "stdin";
}
#ifndef __GNO__
else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) {
#else
else if ((fd2 = open(file2, O_RDONLY)) < 0) {
#endif
if (!sflag)
err(ERR_EXIT, "%s", file2);
else
exit(1);
}
skip1 = argc > 2 ? strtol(argv[2], NULL, 10) : 0;
skip2 = argc == 4 ? strtol(argv[3], NULL, 10) : 0;
#ifndef __GNO__
if (!special) {
if (fstat(fd1, &sb1)) {
if (!sflag)
err(ERR_EXIT, "%s", file1);
else
exit(1);
}
if (!S_ISREG(sb1.st_mode))
special = 1;
else {
if (fstat(fd2, &sb2)) {
if (!sflag)
err(ERR_EXIT, "%s", file2);
else
exit(1);
}
if (!S_ISREG(sb2.st_mode))
special = 1;
}
}
#else
special = 1; /* GNO doesn't have mmap.h, so treat every file as
a special file and process byte by byte */
#endif
if (special)
#ifdef __GNO__
{
#endif
c_special(fd1, file1, skip1, fd2, file2, skip2);
#ifdef __GNO__
close(fd1);
close(fd2);
}
if (rflag != 1) {
rflag = 2;
rcmp(&fd1, &fd2, file1, file2);
close(fd1);
close(fd2);
}
#else
else
c_regular(fd1, file1, skip1, sb1.st_size,
fd2, file2, skip2, sb2.st_size);
#endif
/* exit(0); */
}
static void
#ifndef __STDC__
usage()
#else
usage(void)
#endif
{
(void)fprintf(stderr,
#ifndef __GNO__
"usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
#else
"usage: cmp [-l | -s] [-r] file1 file2 [skip1 [skip2]]\n");
#endif
exit(ERR_EXIT);
}