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/* $OpenBSD: cmp.c,v 1.14 2015/12/29 19:04:46 gsoares Exp $ */ |
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/* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */ |
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/* |
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* Copyright (c) 1987, 1990, 1993, 1994 |
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* The Regents of the University of California. 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. 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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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <err.h> |
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#include <fcntl.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <locale.h> |
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#include "extern.h" |
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int lflag, sflag; |
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static void usage(void); |
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int |
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main(int argc, char *argv[]) |
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{ |
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struct stat sb1, sb2; |
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off_t skip1, skip2; |
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int ch, fd1, fd2, special; |
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char *file1, *file2; |
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setlocale(LC_ALL, ""); |
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✗✓ |
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if (pledge("stdio rpath wpath cpath", NULL) == -1) |
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err(ERR_EXIT, "pledge"); |
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✓✓ |
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while ((ch = getopt(argc, argv, "ls")) != -1) |
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✗✓✗ |
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switch (ch) { |
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case 'l': /* print all differences */ |
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lflag = 1; |
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break; |
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case 's': /* silent run */ |
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sflag = 1; |
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break; |
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case '?': |
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default: |
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usage(); |
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} |
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argv += optind; |
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argc -= optind; |
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✗✓✗✗
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if (lflag && sflag) |
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errx(ERR_EXIT, "only one of -l and -s may be specified"); |
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✗✓ |
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if (argc < 2 || argc > 4) |
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usage(); |
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/* Backward compatibility -- handle "-" meaning stdin. */ |
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special = 0; |
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✓✓ |
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if (strcmp(file1 = argv[0], "-") == 0) { |
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special = 1; |
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fd1 = 0; |
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file1 = "stdin"; |
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✗✓ |
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} else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { |
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if (sflag) |
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exit(ERR_EXIT); |
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else |
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err(ERR_EXIT, "%s", file1); |
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} |
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✓✓ |
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if (strcmp(file2 = argv[1], "-") == 0) { |
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✗✓ |
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if (special) { |
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if (sflag) |
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exit(ERR_EXIT); |
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else |
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errx(ERR_EXIT, |
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"standard input may only be specified once"); |
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} |
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special = 1; |
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fd2 = 0; |
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file2 = "stdin"; |
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✗✓ |
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} else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { |
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if (sflag) |
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exit(ERR_EXIT); |
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else |
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err(ERR_EXIT, "%s", file2); |
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} |
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✗✓ |
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if (pledge("stdio wpath cpath rpath", NULL) == -1) |
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err(ERR_EXIT, "pledge"); |
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✗✓ |
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skip1 = argc > 2 ? strtoq(argv[2], NULL, 0) : 0; |
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✗✓ |
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skip2 = argc == 4 ? strtoq(argv[3], NULL, 0) : 0; |
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✓✓ |
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if (!special) { |
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✗✓ |
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if (fstat(fd1, &sb1)) { |
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if (sflag) |
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exit(ERR_EXIT); |
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else |
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err(ERR_EXIT, "%s", file1); |
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} |
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✗✓ |
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if (!S_ISREG(sb1.st_mode)) |
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special = 1; |
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else { |
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✗✓ |
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if (fstat(fd2, &sb2)) { |
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if (sflag) |
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exit(ERR_EXIT); |
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else |
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err(ERR_EXIT, "%s", file2); |
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} |
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✓✓ |
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if (!S_ISREG(sb2.st_mode)) |
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special = 1; |
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} |
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} |
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✓✓ |
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if (special) |
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c_special(fd1, file1, skip1, fd2, file2, skip2); |
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else |
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c_regular(fd1, file1, skip1, sb1.st_size, |
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fd2, file2, skip2, sb2.st_size); |
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return 0; |
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} |
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static void |
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usage(void) |
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{ |
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(void)fprintf(stderr, |
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"usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n"); |
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exit(ERR_EXIT); |
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} |