269 lines
6.3 KiB
C
269 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 1987 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
char copyright[] =
|
|
"@(#) Copyright (c) 1987, 1990 Regents of the University of California.\n\
|
|
All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
/*static char sccsid[] = "from: @(#)cmp.c 5.3 (Berkeley) 6/1/90";*/
|
|
static char rcsid[] = "$Id: cmp.c,v 1.3 1993/09/21 22:35:56 jtc Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
|
|
#define EXITNODIFF 0
|
|
#define EXITDIFF 1
|
|
#define EXITERR 2
|
|
|
|
int all, fd1, fd2, silent;
|
|
u_char buf1[MAXBSIZE], buf2[MAXBSIZE];
|
|
char *file1, *file2;
|
|
|
|
main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
extern char *optarg;
|
|
extern int optind;
|
|
int ch;
|
|
u_long otoi();
|
|
|
|
while ((ch = getopt(argc, argv, "ls")) != -1)
|
|
switch (ch) {
|
|
case 'l': /* print all differences */
|
|
all = 1;
|
|
break;
|
|
case 's': /* silent run */
|
|
silent = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argv += optind;
|
|
argc -= optind;
|
|
|
|
if (argc < 2 || argc > 4)
|
|
usage();
|
|
|
|
if (all && silent)
|
|
usage ();
|
|
|
|
if (strcmp(file1 = argv[0], "-") == 0)
|
|
fd1 = 0;
|
|
else if ((fd1 = open(file1, O_RDONLY, 0)) < 0)
|
|
error(file1);
|
|
if (strcmp(file2 = argv[1], "-") == 0)
|
|
fd2 = 0;
|
|
else if ((fd2 = open(file2, O_RDONLY, 0)) < 0)
|
|
error(file2);
|
|
if (fd1 == fd2) {
|
|
fprintf(stderr,
|
|
"cmp: standard input may only be specified once.\n");
|
|
exit(EXITERR);
|
|
}
|
|
|
|
/* handle skip arguments */
|
|
if (argc > 2) {
|
|
skip(otoi(argv[2]), fd1, file1);
|
|
if (argc == 4)
|
|
skip(otoi(argv[3]), fd2, file2);
|
|
}
|
|
cmp();
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
/*
|
|
* skip --
|
|
* skip first part of file
|
|
*/
|
|
skip(dist, fd, fname)
|
|
register u_long dist;
|
|
register int fd;
|
|
char *fname;
|
|
{
|
|
register int rlen, nread;
|
|
|
|
for (; dist; dist -= rlen) {
|
|
rlen = MIN(dist, sizeof(buf1));
|
|
if ((nread = read(fd, buf1, rlen)) != rlen) {
|
|
if (nread < 0)
|
|
error(fname);
|
|
else
|
|
endoffile(fname);
|
|
}
|
|
}
|
|
}
|
|
|
|
cmp()
|
|
{
|
|
register u_char *p1, *p2;
|
|
register int cnt, len1, len2;
|
|
register long byte, line;
|
|
int dfound = 0;
|
|
|
|
for (byte = 0, line = 1; ; ) {
|
|
switch (len1 = read(fd1, buf1, MAXBSIZE)) {
|
|
case -1:
|
|
error(file1);
|
|
case 0:
|
|
/*
|
|
* read of file 1 just failed, find out
|
|
* if there's anything left in file 2
|
|
*/
|
|
switch (read(fd2, buf2, 1)) {
|
|
case -1:
|
|
error(file2);
|
|
/* NOTREACHED */
|
|
case 0:
|
|
exit(dfound ? EXITDIFF : EXITNODIFF);
|
|
/* NOTREACHED */
|
|
default:
|
|
endoffile(file1);
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* file1 might be stdio, which means that a read of less than
|
|
* MAXBSIZE might not mean an EOF. So, read whatever we read
|
|
* from file1 from file2.
|
|
*/
|
|
if ((len2 = read(fd2, buf2, len1)) == -1)
|
|
error(file2);
|
|
if (bcmp(buf1, buf2, len2)) {
|
|
if (silent)
|
|
exit(EXITDIFF);
|
|
if (all) {
|
|
dfound = 1;
|
|
for (p1 = buf1, p2 = buf2, cnt = len2; cnt--;
|
|
++p1, ++p2) {
|
|
++byte;
|
|
if (*p1 != *p2)
|
|
printf("%6ld %3o %3o\n",
|
|
byte, *p1, *p2);
|
|
}
|
|
} else for (p1 = buf1, p2 = buf2; ; ++p1, ++p2) {
|
|
++byte;
|
|
if (*p1 != *p2) {
|
|
printf("%s %s differ: char %ld, line %ld\n", file1, file2, byte, line);
|
|
exit(EXITDIFF);
|
|
}
|
|
if (*p1 == '\n')
|
|
++line;
|
|
}
|
|
} else {
|
|
byte += len2;
|
|
/*
|
|
* here's the real performance problem, we've got to
|
|
* count the stupid lines, which means that -l is a
|
|
* *much* faster version, i.e., unless you really
|
|
* *want* to know the line number, run -s or -l.
|
|
*/
|
|
if (!silent && !all)
|
|
for (p1 = buf1, cnt = len2; cnt--; )
|
|
if (*p1++ == '\n')
|
|
++line;
|
|
}
|
|
/*
|
|
* couldn't read as much from file2 as from file1; checked
|
|
* here because there might be a difference before we got
|
|
* to this point, which would have precedence.
|
|
*/
|
|
if (len2 < len1)
|
|
endoffile(file2);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* otoi --
|
|
* octal/decimal string to u_long
|
|
*/
|
|
u_long
|
|
otoi(s)
|
|
register char *s;
|
|
{
|
|
register u_long val;
|
|
register int base;
|
|
|
|
base = (*s == '0') ? 8 : 10;
|
|
for (val = 0; isdigit(*s); ++s)
|
|
val = val * base + *s - '0';
|
|
return (val);
|
|
}
|
|
|
|
/*
|
|
* error --
|
|
* print I/O error message and die
|
|
*/
|
|
error(filename)
|
|
char *filename;
|
|
{
|
|
extern int errno;
|
|
char *strerror();
|
|
|
|
if (!silent)
|
|
(void) fprintf(stderr, "cmp: %s: %s\n",
|
|
filename, strerror(errno));
|
|
exit(EXITERR);
|
|
}
|
|
|
|
/*
|
|
* endoffile --
|
|
* print end-of-file message and exit indicating the files were different
|
|
*/
|
|
endoffile(filename)
|
|
char *filename;
|
|
{
|
|
if (!silent)
|
|
(void) fprintf(stderr, "cmp: EOF on %s\n", filename);
|
|
exit(EXITDIFF);
|
|
}
|
|
|
|
/*
|
|
* usage --
|
|
* print usage and die
|
|
*/
|
|
usage()
|
|
{
|
|
fputs("usage: cmp [-l | -s] file1 file2 [skip1] [skip2]\n", stderr);
|
|
exit(EXITERR);
|
|
}
|