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/* $OpenBSD: cmp.c,v 1.18 2018/03/05 16:57:37 cheloha Exp $ */
/* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */
/*
* 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. 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.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
int lflag, sflag;
static off_t get_skip(const char *, const char *);
static void __dead usage(void);
int
main(int argc, char *argv[])
{
struct stat sb1, sb2;
off_t skip1, skip2;
int ch, fd1, fd2, special;
char *file1, *file2;
if (pledge("stdio rpath", NULL) == -1)
err(ERR_EXIT, "pledge");
while ((ch = getopt(argc, argv, "ls")) != -1)
switch (ch) {
case 'l': /* print all differences */
lflag = 1;
break;
case 's': /* silent run */
sflag = 1;
break;
default:
usage();
}
argv += optind;
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";
} else if ((fd1 = open(file1, O_RDONLY, 0)) == -1)
fatal("%s", file1);
if (strcmp(file2 = argv[1], "-") == 0) {
if (special)
fatalx("standard input may only be specified once");
special = 1;
fd2 = 0;
file2 = "stdin";
} else if ((fd2 = open(file2, O_RDONLY, 0)) == -1)
fatal("%s", file2);
if (pledge("stdio", NULL) == -1)
err(ERR_EXIT, "pledge");
skip1 = (argc > 2) ? get_skip(argv[2], "skip1") : 0;
skip2 = (argc == 4) ? get_skip(argv[3], "skip2") : 0;
if (!special) {
if (fstat(fd1, &sb1) == -1)
fatal("%s", file1);
if (!S_ISREG(sb1.st_mode))
special = 1;
else {
if (fstat(fd2, &sb2) == -1)
fatal("%s", file2);
if (!S_ISREG(sb2.st_mode))
special = 1;
}
}
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);
return 0;
}
static off_t
get_skip(const char *arg, const char *name)
{
off_t skip;
char *ep;
errno = 0;
skip = strtoll(arg, &ep, 0);
if (arg[0] == '\0' || *ep != '\0')
fatalx("%s is invalid: %s", name, arg);
if (skip < 0)
fatalx("%s is too small: %s", name, arg);
if (skip == LLONG_MAX && errno == ERANGE)
fatalx("%s is too large: %s", name, arg);
return skip;
}
static void __dead
usage(void)
{
(void)fprintf(stderr,
"usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
exit(ERR_EXIT);
}
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