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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 static const char copyright[] =
32 "@(#) Copyright (c) 1992, 1993\n\
33 The Regents of the University of California. All rights reserved.\n";
38 static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94";
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
45 #include <sys/param.h>
59 void compress(const char *, const char *, int);
60 void cwarn(const char *, ...) __printflike(1, 2);
61 void cwarnx(const char *, ...) __printflike(1, 2);
62 void decompress(const char *, const char *, int);
63 int permission(const char *);
64 void setfile(const char *, struct stat *);
67 int eval, force, verbose;
70 main(int argc, char *argv[])
72 enum {COMPRESS, DECOMPRESS} style;
75 char *p, newname[MAXPATHLEN];
78 if ((p = rindex(argv[0], '/')) == NULL)
82 if (!strcmp(p, "uncompress"))
84 else if (!strcmp(p, "compress"))
86 else if (!strcmp(p, "zcat")) {
90 errx(1, "unknown program name");
93 while ((ch = getopt(argc, argv, "b:cdfv")) != -1)
96 bits = strtol(optarg, &p, 10);
98 errx(1, "illegal bit count -- %s", optarg);
103 case 'd': /* Backward compatible. */
114 usage(style == COMPRESS);
122 (void)compress("/dev/stdin", "/dev/stdout", bits);
125 (void)decompress("/dev/stdin", "/dev/stdout", bits);
131 if (cat == 1 && argc > 1)
132 errx(1, "the -c option permits only a single file argument");
134 for (; *argv; ++argv)
137 if (strcmp(*argv, "-") == 0) {
138 compress("/dev/stdin", "/dev/stdout", bits);
141 compress(*argv, "/dev/stdout", bits);
144 if ((p = rindex(*argv, '.')) != NULL &&
146 cwarnx("%s: name already has trailing .Z",
151 if (len > sizeof(newname) - 3) {
152 cwarnx("%s: name too long", *argv);
155 memmove(newname, *argv, len);
157 newname[len + 1] = 'Z';
158 newname[len + 2] = '\0';
159 compress(*argv, newname, bits);
162 if (strcmp(*argv, "-") == 0) {
163 decompress("/dev/stdin", "/dev/stdout", bits);
167 if ((p = rindex(*argv, '.')) == NULL ||
169 if (len > sizeof(newname) - 3) {
170 cwarnx("%s: name too long", *argv);
173 memmove(newname, *argv, len);
175 newname[len + 1] = 'Z';
176 newname[len + 2] = '\0';
178 cat ? "/dev/stdout" : *argv, bits);
180 if (len - 2 > sizeof(newname) - 1) {
181 cwarnx("%s: name too long", *argv);
184 memmove(newname, *argv, len - 2);
185 newname[len - 2] = '\0';
187 cat ? "/dev/stdout" : newname, bits);
195 compress(const char *in, const char *out, int bits)
200 int exists, isreg, oreg;
203 exists = !stat(out, &sb);
204 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
206 isreg = oreg = !exists || S_ISREG(sb.st_mode);
209 if ((ifp = fopen(in, "r")) == NULL) {
213 if (stat(in, &isb)) { /* DON'T FSTAT! */
217 if (!S_ISREG(isb.st_mode))
220 if ((ofp = zopen(out, "w", bits)) == NULL) {
224 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
225 if (fwrite(buf, 1, nr, ofp) != nr) {
230 if (ferror(ifp) || fclose(ifp)) {
243 if (stat(out, &sb)) {
248 if (!force && sb.st_size >= isb.st_size) {
250 (void)fprintf(stderr, "%s: file would grow; left unmodified\n",
264 (void)fprintf(stderr, "%s: ", out);
265 if (isb.st_size > sb.st_size)
266 (void)fprintf(stderr, "%.0f%% compression\n",
267 ((float)sb.st_size / isb.st_size) * 100.0);
269 (void)fprintf(stderr, "%.0f%% expansion\n",
270 ((float)isb.st_size / sb.st_size) * 100.0);
285 decompress(const char *in, const char *out, int bits)
290 int exists, isreg, oreg;
293 exists = !stat(out, &sb);
294 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
296 isreg = oreg = !exists || S_ISREG(sb.st_mode);
299 if ((ifp = zopen(in, "r", bits)) == NULL) {
307 if (!S_ISREG(sb.st_mode))
311 * Try to read the first few uncompressed bytes from the input file
312 * before blindly truncating the output file.
314 if ((nr = fread(buf, 1, sizeof(buf), ifp)) == 0) {
319 if ((ofp = fopen(out, "w")) == NULL ||
320 (nr != 0 && fwrite(buf, 1, nr, ofp) != nr)) {
326 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
327 if (fwrite(buf, 1, nr, ofp) != nr) {
332 if (ferror(ifp) || fclose(ifp)) {
361 setfile(const char *name, struct stat *fs)
363 static struct timeval tv[2];
365 fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
367 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atim);
368 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtim);
369 if (utimes(name, tv))
370 cwarn("utimes: %s", name);
373 * Changing the ownership probably won't succeed, unless we're root
374 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
375 * the mode; current BSD behavior is to remove all setuid bits on
376 * chown. If chown fails, lose setuid/setgid bits.
378 if (chown(name, fs->st_uid, fs->st_gid)) {
380 cwarn("chown: %s", name);
381 fs->st_mode &= ~(S_ISUID|S_ISGID);
383 if (chmod(name, fs->st_mode) && errno != EOPNOTSUPP)
384 cwarn("chmod: %s", name);
386 if (chflags(name, fs->st_flags) && errno != EOPNOTSUPP)
387 cwarn("chflags: %s", name);
391 permission(const char *fname)
395 if (!isatty(fileno(stderr)))
397 (void)fprintf(stderr, "overwrite %s? ", fname);
398 first = ch = getchar();
399 while (ch != '\n' && ch != EOF)
401 return (first == 'y');
405 usage(int iscompress)
408 (void)fprintf(stderr,
409 "usage: compress [-cfv] [-b bits] [file ...]\n");
411 (void)fprintf(stderr,
412 "usage: uncompress [-c] [-b bits] [file ...]\n");
417 cwarnx(const char *fmt, ...)
428 cwarn(const char *fmt, ...)