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
35 static const char copyright[] =
36 "@(#) Copyright (c) 1992, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
42 static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94";
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
49 #include <sys/param.h>
63 void compress(const char *, const char *, int);
64 void cwarn(const char *, ...) __printflike(1, 2);
65 void cwarnx(const char *, ...) __printflike(1, 2);
66 void decompress(const char *, const char *, int);
67 int permission(const char *);
68 void setfile(const char *, struct stat *);
71 int eval, force, verbose;
74 main(int argc, char *argv[])
76 enum {COMPRESS, DECOMPRESS} style;
79 char *p, newname[MAXPATHLEN];
82 if ((p = rindex(argv[0], '/')) == NULL)
86 if (!strcmp(p, "uncompress"))
88 else if (!strcmp(p, "compress"))
90 else if (!strcmp(p, "zcat")) {
94 errx(1, "unknown program name");
97 while ((ch = getopt(argc, argv, "b:cdfv")) != -1)
100 bits = strtol(optarg, &p, 10);
102 errx(1, "illegal bit count -- %s", optarg);
107 case 'd': /* Backward compatible. */
118 usage(style == COMPRESS);
126 (void)compress("/dev/stdin", "/dev/stdout", bits);
129 (void)decompress("/dev/stdin", "/dev/stdout", bits);
135 if (cat == 1 && argc > 1)
136 errx(1, "the -c option permits only a single file argument");
138 for (; *argv; ++argv)
141 if (strcmp(*argv, "-") == 0) {
142 compress("/dev/stdin", "/dev/stdout", bits);
145 compress(*argv, "/dev/stdout", bits);
148 if ((p = rindex(*argv, '.')) != NULL &&
150 cwarnx("%s: name already has trailing .Z",
155 if (len > sizeof(newname) - 3) {
156 cwarnx("%s: name too long", *argv);
159 memmove(newname, *argv, len);
161 newname[len + 1] = 'Z';
162 newname[len + 2] = '\0';
163 compress(*argv, newname, bits);
166 if (strcmp(*argv, "-") == 0) {
167 decompress("/dev/stdin", "/dev/stdout", bits);
171 if ((p = rindex(*argv, '.')) == NULL ||
173 if (len > sizeof(newname) - 3) {
174 cwarnx("%s: name too long", *argv);
177 memmove(newname, *argv, len);
179 newname[len + 1] = 'Z';
180 newname[len + 2] = '\0';
182 cat ? "/dev/stdout" : *argv, bits);
184 if (len - 2 > sizeof(newname) - 1) {
185 cwarnx("%s: name too long", *argv);
188 memmove(newname, *argv, len - 2);
189 newname[len - 2] = '\0';
191 cat ? "/dev/stdout" : newname, bits);
199 compress(const char *in, const char *out, int bits)
204 int exists, isreg, oreg;
207 exists = !stat(out, &sb);
208 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
210 isreg = oreg = !exists || S_ISREG(sb.st_mode);
213 if ((ifp = fopen(in, "r")) == NULL) {
217 if (stat(in, &isb)) { /* DON'T FSTAT! */
221 if (!S_ISREG(isb.st_mode))
224 if ((ofp = zopen(out, "w", bits)) == NULL) {
228 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
229 if (fwrite(buf, 1, nr, ofp) != nr) {
234 if (ferror(ifp) || fclose(ifp)) {
247 if (stat(out, &sb)) {
252 if (!force && sb.st_size >= isb.st_size) {
254 (void)fprintf(stderr, "%s: file would grow; left unmodified\n",
268 (void)fprintf(stderr, "%s: ", out);
269 if (isb.st_size > sb.st_size)
270 (void)fprintf(stderr, "%.0f%% compression\n",
271 ((float)sb.st_size / isb.st_size) * 100.0);
273 (void)fprintf(stderr, "%.0f%% expansion\n",
274 ((float)isb.st_size / sb.st_size) * 100.0);
289 decompress(const char *in, const char *out, int bits)
294 int exists, isreg, oreg;
297 exists = !stat(out, &sb);
298 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
300 isreg = oreg = !exists || S_ISREG(sb.st_mode);
303 if ((ifp = zopen(in, "r", bits)) == NULL) {
311 if (!S_ISREG(sb.st_mode))
315 * Try to read the first few uncompressed bytes from the input file
316 * before blindly truncating the output file.
318 if ((nr = fread(buf, 1, sizeof(buf), ifp)) == 0) {
323 if ((ofp = fopen(out, "w")) == NULL ||
324 (nr != 0 && fwrite(buf, 1, nr, ofp) != nr)) {
330 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
331 if (fwrite(buf, 1, nr, ofp) != nr) {
336 if (ferror(ifp) || fclose(ifp)) {
365 setfile(const char *name, struct stat *fs)
367 static struct timeval tv[2];
369 fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
371 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
372 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
373 if (utimes(name, tv))
374 cwarn("utimes: %s", name);
377 * Changing the ownership probably won't succeed, unless we're root
378 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
379 * the mode; current BSD behavior is to remove all setuid bits on
380 * chown. If chown fails, lose setuid/setgid bits.
382 if (chown(name, fs->st_uid, fs->st_gid)) {
384 cwarn("chown: %s", name);
385 fs->st_mode &= ~(S_ISUID|S_ISGID);
387 if (chmod(name, fs->st_mode) && errno != EOPNOTSUPP)
388 cwarn("chmod: %s", name);
390 if (chflags(name, fs->st_flags) && errno != EOPNOTSUPP)
391 cwarn("chflags: %s", name);
395 permission(const char *fname)
399 if (!isatty(fileno(stderr)))
401 (void)fprintf(stderr, "overwrite %s? ", fname);
402 first = ch = getchar();
403 while (ch != '\n' && ch != EOF)
405 return (first == 'y');
409 usage(int iscompress)
412 (void)fprintf(stderr,
413 "usage: compress [-cfv] [-b bits] [file ...]\n");
415 (void)fprintf(stderr,
416 "usage: uncompress [-c] [-b bits] [file ...]\n");
421 cwarnx(const char *fmt, ...)
432 cwarn(const char *fmt, ...)