276 lines
6.5 KiB
C
276 lines
6.5 KiB
C
/*
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* Copyright (c) 1987 Regents of the University of California.
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* 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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char copyright[] =
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"@(#) Copyright (c) 1987, 1990 Regents of the University of California.\n\
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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 5.3 (Berkeley) 6/1/90";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#define EXITNODIFF 0
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#define EXITDIFF 1
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#define EXITERR 2
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int all, fd1, fd2, silent;
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u_char buf1[MAXBSIZE], buf2[MAXBSIZE];
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char *file1, *file2;
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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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extern char *optarg;
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extern int optind;
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int ch;
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u_long otoi();
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while ((ch = getopt(argc, argv, "-ls")) != EOF)
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switch (ch) {
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case 'l': /* print all differences */
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all = 1;
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break;
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case 's': /* silent run */
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silent = 1;
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break;
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case '-': /* must be after any flags */
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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 (argc < 2 || argc > 4)
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usage();
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if (all && silent) {
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fprintf(stderr,
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"cmp: only one of -l and -s may be specified.\n");
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exit(EXITERR);
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}
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if (strcmp(file1 = argv[0], "-") == 0)
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fd1 = 0;
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else if ((fd1 = open(file1, O_RDONLY, 0)) < 0)
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error(file1);
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if (strcmp(file2 = argv[1], "-") == 0)
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fd2 = 0;
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else if ((fd2 = open(file2, O_RDONLY, 0)) < 0)
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error(file2);
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if (fd1 == fd2) {
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fprintf(stderr,
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"cmp: standard input may only be specified once.\n");
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exit(EXITERR);
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}
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/* handle skip arguments */
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if (argc > 2) {
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skip(otoi(argv[2]), fd1, file1);
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if (argc == 4)
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skip(otoi(argv[3]), fd2, file2);
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}
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cmp();
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/*NOTREACHED*/
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}
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/*
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* skip --
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* skip first part of file
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*/
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skip(dist, fd, fname)
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register u_long dist;
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register int fd;
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char *fname;
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{
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register int rlen, nread;
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for (; dist; dist -= rlen) {
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rlen = MIN(dist, sizeof(buf1));
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if ((nread = read(fd, buf1, rlen)) != rlen) {
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if (nread < 0)
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error(fname);
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else
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endoffile(fname);
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}
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}
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}
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cmp()
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{
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register u_char *p1, *p2;
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register int cnt, len1, len2;
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register long byte, line;
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int dfound = 0;
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for (byte = 0, line = 1; ; ) {
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switch (len1 = read(fd1, buf1, MAXBSIZE)) {
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case -1:
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error(file1);
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case 0:
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/*
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* read of file 1 just failed, find out
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* if there's anything left in file 2
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*/
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switch (read(fd2, buf2, 1)) {
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case -1:
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error(file2);
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/* NOTREACHED */
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case 0:
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exit(dfound ? EXITDIFF : EXITNODIFF);
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/* NOTREACHED */
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default:
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endoffile(file1);
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break;
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}
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}
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/*
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* file1 might be stdio, which means that a read of less than
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* MAXBSIZE might not mean an EOF. So, read whatever we read
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* from file1 from file2.
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*/
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if ((len2 = read(fd2, buf2, len1)) == -1)
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error(file2);
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if (bcmp(buf1, buf2, len2)) {
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if (silent)
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exit(EXITDIFF);
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if (all) {
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dfound = 1;
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for (p1 = buf1, p2 = buf2, cnt = len2; cnt--;
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++p1, ++p2) {
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++byte;
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if (*p1 != *p2)
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printf("%6ld %3o %3o\n",
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byte, *p1, *p2);
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}
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} else for (p1 = buf1, p2 = buf2; ; ++p1, ++p2) {
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++byte;
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if (*p1 != *p2) {
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printf("%s %s differ: char %ld, line %ld\n", file1, file2, byte, line);
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exit(EXITDIFF);
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}
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if (*p1 == '\n')
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++line;
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}
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} else {
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byte += len2;
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/*
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* here's the real performance problem, we've got to
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* count the stupid lines, which means that -l is a
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* *much* faster version, i.e., unless you really
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* *want* to know the line number, run -s or -l.
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*/
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if (!silent && !all)
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for (p1 = buf1, cnt = len2; cnt--; )
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if (*p1++ == '\n')
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++line;
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}
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/*
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* couldn't read as much from file2 as from file1; checked
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* here because there might be a difference before we got
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* to this point, which would have precedence.
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*/
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if (len2 < len1)
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endoffile(file2);
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}
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}
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/*
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* otoi --
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* octal/decimal string to u_long
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*/
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u_long
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otoi(s)
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register char *s;
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{
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register u_long val;
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register int base;
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base = (*s == '0') ? 8 : 10;
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for (val = 0; isdigit(*s); ++s)
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val = val * base + *s - '0';
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return (val);
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}
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/*
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* error --
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* print I/O error message and die
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*/
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error(filename)
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char *filename;
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{
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extern int errno;
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char *strerror();
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if (!silent)
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(void) fprintf(stderr, "cmp: %s: %s\n",
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filename, strerror(errno));
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exit(EXITERR);
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}
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/*
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* endoffile --
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* print end-of-file message and exit indicating the files were different
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*/
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endoffile(filename)
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char *filename;
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{
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/* 32V put this message on stdout, S5 does it on stderr. */
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/* POSIX.2 currently does it on stdout-- Hooray! */
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if (!silent)
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(void) printf("cmp: EOF on %s\n", filename);
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exit(EXITDIFF);
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}
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/*
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* usage --
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* print usage and die
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*/
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usage()
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{
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fputs("usage: cmp [-ls] file1 file2 [skip1] [skip2]\n", stderr);
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exit(EXITERR);
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}
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