/* $OpenBSD: cmp.c,v 1.19 2021/10/24 21:24:16 deraadt Exp $ */ /* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls 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/types.h> #include <sys/stat.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <limits.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "extern.h" int lflag, sflag; static off_t get_skip(const char *, const char *); static void __dead usage(void); int main(int argc, char *argv[]) { struct stat sb1, sb2; off_t skip1, skip2; int ch, fd1, fd2, special; char *file1, *file2; if (pledge("stdio rpath", NULL) == -1) err(ERR_EXIT, "pledge"); while ((ch = getopt(argc, argv, "ls")) != -1) switch (ch) { case 'l': /* print all differences */ lflag = 1; break; case 's': /* silent run */ sflag = 1; break; 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. */ special = 0; if (strcmp(file1 = argv[0], "-") == 0) { special = 1; fd1 = 0; file1 = "stdin"; } else if ((fd1 = open(file1, O_RDONLY)) == -1) fatal("%s", file1); if (strcmp(file2 = argv[1], "-") == 0) { if (special) fatalx("standard input may only be specified once"); special = 1; fd2 = 0; file2 = "stdin"; } else if ((fd2 = open(file2, O_RDONLY)) == -1) fatal("%s", file2); if (pledge("stdio", NULL) == -1) err(ERR_EXIT, "pledge"); skip1 = (argc > 2) ? get_skip(argv[2], "skip1") : 0; skip2 = (argc == 4) ? get_skip(argv[3], "skip2") : 0; if (!special) { if (fstat(fd1, &sb1) == -1) fatal("%s", file1); if (!S_ISREG(sb1.st_mode)) special = 1; else { if (fstat(fd2, &sb2) == -1) fatal("%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); return 0; } static off_t get_skip(const char *arg, const char *name) { off_t skip; char *ep; errno = 0; skip = strtoll(arg, &ep, 0); if (arg[0] == '\0' || *ep != '\0') fatalx("%s is invalid: %s", name, arg); if (skip < 0) fatalx("%s is too small: %s", name, arg); if (skip == LLONG_MAX && errno == ERANGE) fatalx("%s is too large: %s", name, arg); return skip; } static void __dead usage(void) { (void)fprintf(stderr, "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n"); exit(ERR_EXIT); }