diff options
Diffstat (limited to 'usr.bin/cmp/cmp.c')
| -rw-r--r-- | usr.bin/cmp/cmp.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/usr.bin/cmp/cmp.c b/usr.bin/cmp/cmp.c new file mode 100644 index 0000000..4301731 --- /dev/null +++ b/usr.bin/cmp/cmp.c @@ -0,0 +1,168 @@ +/* $NetBSD: cmp.c,v 1.20 2016/10/30 19:33:49 christos 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/cdefs.h> +#ifndef lint +__COPYRIGHT("@(#) Copyright (c) 1987, 1990, 1993, 1994\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; +#else +__RCSID("$NetBSD: cmp.c,v 1.20 2016/10/30 19:33:49 christos Exp $"); +#endif +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/stat.h> + +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <locale.h> + +#include "extern.h" + +int lflag, sflag; + +__dead static void usage(void); + +int +main(int argc, char *argv[]) +{ + struct stat sb1, sb2; + off_t skip1 = 0, skip2 = 0; + int ch, fd1, fd2, special; + const char *file1, *file2; + + setlocale(LC_ALL, ""); + + special = 0; + while ((ch = getopt(argc, argv, "cls")) != -1) + switch (ch) { + case 'c': + special = 1; /* careful! Don't use mmap() */ + break; + case 'l': /* print all differences */ + lflag = 1; + break; + case 's': /* silent run */ + sflag = 1; + break; + case '?': + 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. */ + if (strcmp(file1 = argv[0], "-") == 0) { + special = 1; + fd1 = 0; + file1 = "stdin"; + } + else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { + if (!sflag) + warn("%s", file1); + exit(ERR_EXIT); + } + if (strcmp(file2 = argv[1], "-") == 0) { + if (special) + errx(ERR_EXIT, + "standard input may only be specified once"); + special = 1; + fd2 = 0; + file2 = "stdin"; + } + else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { + if (!sflag) + warn("%s", file2); + exit(ERR_EXIT); + } + + if (argc > 2) { + char *ep; + + errno = 0; + skip1 = strtoq(argv[2], &ep, 0); + if (errno || ep == argv[2]) + usage(); + + if (argc == 4) { + skip2 = strtoq(argv[3], &ep, 0); + if (errno || ep == argv[3]) + usage(); + } + } + + if (!special) { + if (fstat(fd1, &sb1)) + err(ERR_EXIT, "%s", file1); + if (!S_ISREG(sb1.st_mode)) + special = 1; + else { + if (fstat(fd2, &sb2)) + err(ERR_EXIT, "%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); + exit(0); +} + +static void +usage(void) +{ + + (void)fprintf(stderr, + "Usage: %s [-c] [-l | -s] file1 file2 [skip1 [skip2]]\n", + getprogname()); + exit(ERR_EXIT); +} |