diff options
Diffstat (limited to 'usr.bin/cmp/cmp.c')
| -rw-r--r-- | usr.bin/cmp/cmp.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/usr.bin/cmp/cmp.c b/usr.bin/cmp/cmp.c new file mode 100644 index 000000000000..746616c0c20b --- /dev/null +++ b/usr.bin/cmp/cmp.c @@ -0,0 +1,269 @@ +/* + * SPDX-License-Identifier: BSD-3-Clause + * + * 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 <capsicum_helpers.h> +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <nl_types.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <libutil.h> + +#include "extern.h" + +bool bflag, lflag, sflag, xflag, zflag; + +static const struct option long_opts[] = +{ + {"print-bytes", no_argument, NULL, 'b'}, + {"ignore-initial", required_argument, NULL, 'i'}, + {"verbose", no_argument, NULL, 'l'}, + {"bytes", required_argument, NULL, 'n'}, + {"silent", no_argument, NULL, 's'}, + {"quiet", no_argument, NULL, 's'}, + {NULL, no_argument, NULL, 0} +}; + +#ifdef SIGINFO +volatile sig_atomic_t info; + +static void +siginfo(int signo) +{ + info = signo; +} +#endif + +static void usage(void) __dead2; + +static bool +parse_iskipspec(char *spec, off_t *skip1, off_t *skip2) +{ + char *colon; + + colon = strchr(spec, ':'); + if (colon != NULL) + *colon++ = '\0'; + + if (expand_number(spec, skip1) < 0) + return (false); + + if (colon != NULL) + return (expand_number(colon, skip2) == 0); + + *skip2 = *skip1; + return (true); +} + +int +main(int argc, char *argv[]) +{ + struct stat sb1, sb2; + off_t skip1, skip2, limit; + int ch, fd1, fd2, oflag; + bool special; + const char *file1, *file2; + int ret; + + limit = skip1 = skip2 = ret = 0; + oflag = O_RDONLY; + while ((ch = getopt_long(argc, argv, "+bhi:ln:sxz", long_opts, NULL)) != -1) + switch (ch) { + case 'b': /* Print bytes */ + bflag = true; + break; + case 'h': /* Don't follow symlinks */ + oflag |= O_NOFOLLOW; + break; + case 'i': + if (!parse_iskipspec(optarg, &skip1, &skip2)) { + fprintf(stderr, + "Invalid --ignore-initial: %s\n", + optarg); + usage(); + } + break; + case 'l': /* print all differences */ + lflag = true; + break; + case 'n': /* Limit */ + if (expand_number(optarg, &limit) < 0 || limit < 0) { + fprintf(stderr, "Invalid --bytes: %s\n", + optarg); + usage(); + } + break; + case 's': /* silent run */ + sflag = true; + break; + case 'x': /* hex output */ + lflag = true; + xflag = true; + break; + case 'z': /* compare size first */ + zflag = true; + break; + case '?': + default: + usage(); + } + argv += optind; + argc -= optind; + + if (lflag && sflag) + errx(ERR_EXIT, "specifying -s with -l or -x is not permitted"); + + if (argc < 2 || argc > 4) + usage(); + + /* Don't limit rights on stdin since it may be one of the inputs. */ + if (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF)) + err(ERR_EXIT, "unable to limit rights on stdout"); + if (caph_limit_stream(STDERR_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF)) + err(ERR_EXIT, "unable to limit rights on stderr"); + + /* Backward compatibility -- handle "-" meaning stdin. */ + special = false; + if (strcmp(file1 = argv[0], "-") == 0) { + special = true; + fd1 = STDIN_FILENO; + file1 = "stdin"; + } else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) { + if (!sflag) + err(ERR_EXIT, "%s", file1); + else + exit(ERR_EXIT); + } + if (strcmp(file2 = argv[1], "-") == 0) { + if (special) + errx(ERR_EXIT, + "standard input may only be specified once"); + special = true; + fd2 = STDIN_FILENO; + file2 = "stdin"; + } else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) { + if (!sflag) + err(ERR_EXIT, "%s", file2); + else + exit(ERR_EXIT); + } + + if (argc > 2 && expand_number(argv[2], &skip1) < 0) { + fprintf(stderr, "Invalid skip1: %s\n", argv[2]); + usage(); + } + + if (argc == 4 && expand_number(argv[3], &skip2) < 0) { + fprintf(stderr, "Invalid skip2: %s\n", argv[3]); + usage(); + } + + if (sflag && skip1 == 0 && skip2 == 0) + zflag = true; + + if (fd1 == -1) { + if (fd2 == -1) { + ret = c_link(file1, skip1, file2, skip2, limit); + goto end; + } else if (!sflag) + errx(ERR_EXIT, "%s: Not a symbolic link", file2); + else + exit(ERR_EXIT); + } else if (fd2 == -1) { + if (!sflag) + errx(ERR_EXIT, "%s: Not a symbolic link", file1); + else + exit(ERR_EXIT); + } + + /* FD rights are limited in c_special() and c_regular(). */ + caph_cache_catpages(); + + if (!special) { + if (fstat(fd1, &sb1)) { + if (!sflag) + err(ERR_EXIT, "%s", file1); + else + exit(ERR_EXIT); + } + if (!S_ISREG(sb1.st_mode)) + special = true; + else { + if (fstat(fd2, &sb2)) { + if (!sflag) + err(ERR_EXIT, "%s", file2); + else + exit(ERR_EXIT); + } + if (!S_ISREG(sb2.st_mode)) + special = true; + } + } + +#ifdef SIGINFO + (void)signal(SIGINFO, siginfo); +#endif + if (special) { + ret = c_special(fd1, file1, skip1, fd2, file2, skip2, limit); + } else { + if (zflag && sb1.st_size != sb2.st_size) { + if (!sflag) + (void)printf("%s %s differ: size\n", + file1, file2); + ret = DIFF_EXIT; + } else { + ret = c_regular(fd1, file1, skip1, sb1.st_size, + fd2, file2, skip2, sb2.st_size, limit); + } + } +end: + if (!sflag && fflush(stdout) != 0) + err(ERR_EXIT, "stdout"); + exit(ret); +} + +static void +usage(void) +{ + + (void)fprintf(stderr, + "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n"); + exit(ERR_EXIT); +} |