Annotation of src/usr.bin/cmp/cmp.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1987, 1990, 1993, 1994
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by the University of
! 18: * California, Berkeley and its contributors.
! 19: * 4. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: */
! 35:
! 36: #ifndef lint
! 37: static char copyright[] =
! 38: "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\
! 39: The Regents of the University of California. All rights reserved.\n";
! 40: #endif /* not lint */
! 41:
! 42: #ifndef lint
! 43: #if 0
! 44: static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
! 45: #else
! 46: static char rcsid[] = "$NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $";
! 47: #endif
! 48: #endif /* not lint */
! 49:
! 50: #include <sys/types.h>
! 51: #include <sys/stat.h>
! 52:
! 53: #include <err.h>
! 54: #include <fcntl.h>
! 55: #include <stdio.h>
! 56: #include <stdlib.h>
! 57: #include <string.h>
! 58: #include <unistd.h>
! 59: #include <locale.h>
! 60:
! 61: #include "extern.h"
! 62:
! 63: int lflag, sflag;
! 64:
! 65: static void usage __P((void));
! 66:
! 67: int
! 68: main(argc, argv)
! 69: int argc;
! 70: char *argv[];
! 71: {
! 72: struct stat sb1, sb2;
! 73: off_t skip1, skip2;
! 74: int ch, fd1, fd2, special;
! 75: char *file1, *file2;
! 76:
! 77: setlocale(LC_ALL, "");
! 78:
! 79: while ((ch = getopt(argc, argv, "ls")) != EOF)
! 80: switch (ch) {
! 81: case 'l': /* print all differences */
! 82: lflag = 1;
! 83: break;
! 84: case 's': /* silent run */
! 85: sflag = 1;
! 86: break;
! 87: case '?':
! 88: default:
! 89: usage();
! 90: }
! 91: endargs:
! 92: argv += optind;
! 93: argc -= optind;
! 94:
! 95: if (lflag && sflag)
! 96: errx(ERR_EXIT, "only one of -l and -s may be specified");
! 97:
! 98: if (argc < 2 || argc > 4)
! 99: usage();
! 100:
! 101: /* Backward compatibility -- handle "-" meaning stdin. */
! 102: special = 0;
! 103: if (strcmp(file1 = argv[0], "-") == 0) {
! 104: special = 1;
! 105: fd1 = 0;
! 106: file1 = "stdin";
! 107: }
! 108: else if ((fd1 = open(file1, O_RDONLY, 0)) < 0)
! 109: err(ERR_EXIT, "%s", file1);
! 110: if (strcmp(file2 = argv[1], "-") == 0) {
! 111: if (special)
! 112: errx(ERR_EXIT,
! 113: "standard input may only be specified once");
! 114: special = 1;
! 115: fd2 = 0;
! 116: file2 = "stdin";
! 117: }
! 118: else if ((fd2 = open(file2, O_RDONLY, 0)) < 0)
! 119: err(ERR_EXIT, "%s", file2);
! 120:
! 121: skip1 = argc > 2 ? strtoq(argv[2], NULL, 10) : 0;
! 122: skip2 = argc == 4 ? strtoq(argv[3], NULL, 10) : 0;
! 123:
! 124: if (!special) {
! 125: if (fstat(fd1, &sb1))
! 126: err(ERR_EXIT, "%s", file1);
! 127: if (!S_ISREG(sb1.st_mode))
! 128: special = 1;
! 129: else {
! 130: if (fstat(fd2, &sb2))
! 131: err(ERR_EXIT, "%s", file2);
! 132: if (!S_ISREG(sb2.st_mode))
! 133: special = 1;
! 134: }
! 135: }
! 136:
! 137: if (special)
! 138: c_special(fd1, file1, skip1, fd2, file2, skip2);
! 139: else
! 140: c_regular(fd1, file1, skip1, sb1.st_size,
! 141: fd2, file2, skip2, sb2.st_size);
! 142: exit(0);
! 143: }
! 144:
! 145: static void
! 146: usage()
! 147: {
! 148:
! 149: (void)fprintf(stderr,
! 150: "usage: cmp [-l | s] file1 file2 [skip1 [skip2]]\n");
! 151: exit(ERR_EXIT);
! 152: }
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