2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)compress.c 8.2 (Berkeley) 1/7/94
35 * $FreeBSD: src/usr.bin/compress/compress.c,v 1.7.6.5 2002/07/16 00:56:04 tjr Exp $
36 * $DragonFly: src/usr.bin/compress/compress.c,v 1.4 2004/08/30 18:06:49 eirikn Exp $
39 #include <sys/param.h>
53 void compress(const char *, const char *, int);
54 void cwarn(const char *, ...) __printflike(1, 2);
55 void cwarnx(const char *, ...) __printflike(1, 2);
56 void decompress(const char *, const char *, int);
57 int permission(const char *);
58 void setfile(const char *, struct stat *);
61 int eval, force, verbose;
64 main(int argc, char **argv)
66 enum {COMPRESS, DECOMPRESS} style;
69 char *p, newname[MAXPATHLEN];
72 if ((p = strrchr(argv[0], '/')) == NULL)
76 if (!strcmp(p, "uncompress"))
78 else if (!strcmp(p, "compress"))
80 else if (!strcmp(p, "zcat")) {
84 errx(1, "unknown program name");
87 while ((ch = getopt(argc, argv, "b:cdfv")) != -1)
90 bits = strtol(optarg, &p, 10);
92 errx(1, "illegal bit count -- %s", optarg);
97 case 'd': /* Backward compatible. */
108 usage(style == COMPRESS);
116 (void)compress("/dev/stdin", "/dev/stdout", bits);
119 (void)decompress("/dev/stdin", "/dev/stdout", bits);
125 if (cat == 1 && argc > 1)
126 errx(1, "the -c option permits only a single file argument");
128 for (; *argv; ++argv)
131 if (strcmp(*argv, "-") == 0) {
132 compress("/dev/stdin", "/dev/stdout", bits);
135 compress(*argv, "/dev/stdout", bits);
138 if ((p = strrchr(*argv, '.')) != NULL &&
140 cwarnx("%s: name already has trailing .Z",
145 if (len > sizeof(newname) - 3) {
146 cwarnx("%s: name too long", *argv);
149 memmove(newname, *argv, len);
151 newname[len + 1] = 'Z';
152 newname[len + 2] = '\0';
153 compress(*argv, newname, bits);
156 if (strcmp(*argv, "-") == 0) {
157 decompress("/dev/stdin", "/dev/stdout", bits);
161 if ((p = strrchr(*argv, '.')) == NULL ||
163 if (len > sizeof(newname) - 3) {
164 cwarnx("%s: name too long", *argv);
167 memmove(newname, *argv, len);
169 newname[len + 1] = 'Z';
170 newname[len + 2] = '\0';
172 cat ? "/dev/stdout" : *argv, bits);
174 if (len - 2 > sizeof(newname) - 1) {
175 cwarnx("%s: name too long", *argv);
178 memmove(newname, *argv, len - 2);
179 newname[len - 2] = '\0';
181 cat ? "/dev/stdout" : newname, bits);
189 compress(const char *in, const char *out, int bits)
194 int exists, isreg, oreg;
197 exists = !stat(out, &sb);
198 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
200 isreg = oreg = !exists || S_ISREG(sb.st_mode);
203 if ((ifp = fopen(in, "r")) == NULL) {
207 if (stat(in, &isb)) { /* DON'T FSTAT! */
211 if (!S_ISREG(isb.st_mode))
214 if ((ofp = zopen(out, "w", bits)) == NULL) {
218 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
219 if (fwrite(buf, 1, nr, ofp) != nr) {
224 if (ferror(ifp) || fclose(ifp)) {
237 if (stat(out, &sb)) {
242 if (!force && sb.st_size >= isb.st_size) {
244 (void)fprintf(stderr, "%s: file would grow; left unmodified\n",
258 (void)fprintf(stderr, "%s: ", out);
259 if (isb.st_size > sb.st_size)
260 (void)fprintf(stderr, "%.0f%% compression\n",
261 ((float)sb.st_size / isb.st_size) * 100.0);
263 (void)fprintf(stderr, "%.0f%% expansion\n",
264 ((float)isb.st_size / sb.st_size) * 100.0);
279 decompress(const char *in, const char *out, int bits)
284 int exists, isreg, oreg;
287 exists = !stat(out, &sb);
288 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
290 isreg = oreg = !exists || S_ISREG(sb.st_mode);
293 if ((ofp = fopen(out, "w")) == NULL) {
298 if ((ifp = zopen(in, "r", bits)) == NULL) {
306 if (!S_ISREG(sb.st_mode))
309 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
310 if (fwrite(buf, 1, nr, ofp) != nr) {
315 if (ferror(ifp) || fclose(ifp)) {
344 setfile(const char *name, struct stat *fs)
346 static struct timeval tv[2];
348 fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
350 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
351 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
352 if (utimes(name, tv))
353 cwarn("utimes: %s", name);
356 * Changing the ownership probably won't succeed, unless we're root
357 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
358 * the mode; current BSD behavior is to remove all setuid bits on
359 * chown. If chown fails, lose setuid/setgid bits.
361 if (chown(name, fs->st_uid, fs->st_gid)) {
363 cwarn("chown: %s", name);
364 fs->st_mode &= ~(S_ISUID|S_ISGID);
366 if (chmod(name, fs->st_mode) && errno != EOPNOTSUPP)
367 cwarn("chmod: %s", name);
369 if (chflags(name, fs->st_flags) && errno != EOPNOTSUPP)
370 cwarn("chflags: %s", name);
374 permission(const char *fname)
378 if (!isatty(fileno(stderr)))
380 (void)fprintf(stderr, "overwrite %s? ", fname);
381 first = ch = getchar();
382 while (ch != '\n' && ch != EOF)
384 return (first == 'y');
388 usage(int iscompress)
391 (void)fprintf(stderr,
392 "usage: compress [-cfv] [-b bits] [file ...]\n");
394 (void)fprintf(stderr,
395 "usage: uncompress [-c] [-b bits] [file ...]\n");
400 cwarnx(const char *fmt, ...)
411 cwarn(const char *fmt, ...)