1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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. 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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)compress.c 8.2 (Berkeley) 1/7/94
31 * $FreeBSD: src/usr.bin/compress/compress.c,v 1.7.6.5 2002/07/16 00:56:04 tjr Exp $
32 */
33
34 #include <sys/param.h>
35 #include <sys/stat.h>
36 #include <sys/time.h>
37
38 #include <err.h>
39 #include <errno.h>
40 #include <stdarg.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 #include "zopen.h"
47
48 static void compress(const char *, const char *, int);
49 static void cwarn(const char *, ...) __printflike(1, 2);
50 static void cwarnx(const char *, ...) __printflike(1, 2);
51 static void decompress(const char *, const char *, int);
52 static int permission(const char *);
53 static void setfile(const char *, struct stat *);
54 static void usage(int) __dead2;
55
56 static int eval, force, verbose;
57
58 int
main(int argc,char ** argv)59 main(int argc, char **argv)
60 {
61 enum {COMPRESS, DECOMPRESS} style;
62 size_t len;
63 int bits, cat, ch;
64 char *p, newname[MAXPATHLEN];
65
66 cat = 0;
67 if ((p = strrchr(argv[0], '/')) == NULL)
68 p = argv[0];
69 else
70 ++p;
71 if (!strcmp(p, "uncompress"))
72 style = DECOMPRESS;
73 else if (!strcmp(p, "compress"))
74 style = COMPRESS;
75 else if (!strcmp(p, "zcat")) {
76 cat = 1;
77 style = DECOMPRESS;
78 } else
79 errx(1, "unknown program name");
80
81 bits = 0;
82 while ((ch = getopt(argc, argv, "b:cdfv")) != -1)
83 switch(ch) {
84 case 'b':
85 bits = strtol(optarg, &p, 10);
86 if (*p)
87 errx(1, "illegal bit count -- %s", optarg);
88 break;
89 case 'c':
90 cat = 1;
91 break;
92 case 'd': /* Backward compatible. */
93 style = DECOMPRESS;
94 break;
95 case 'f':
96 force = 1;
97 break;
98 case 'v':
99 verbose = 1;
100 break;
101 case '?':
102 default:
103 usage(style == COMPRESS);
104 }
105 argc -= optind;
106 argv += optind;
107
108 if (argc == 0) {
109 switch(style) {
110 case COMPRESS:
111 (void)compress("/dev/stdin", "/dev/stdout", bits);
112 break;
113 case DECOMPRESS:
114 (void)decompress("/dev/stdin", "/dev/stdout", bits);
115 break;
116 }
117 exit (eval);
118 }
119
120 if (cat == 1 && argc > 1)
121 errx(1, "the -c option permits only a single file argument");
122
123 for (; *argv; ++argv)
124 switch(style) {
125 case COMPRESS:
126 if (strcmp(*argv, "-") == 0) {
127 compress("/dev/stdin", "/dev/stdout", bits);
128 break;
129 } else if (cat) {
130 compress(*argv, "/dev/stdout", bits);
131 break;
132 }
133 if ((p = strrchr(*argv, '.')) != NULL &&
134 !strcmp(p, ".Z")) {
135 cwarnx("%s: name already has trailing .Z",
136 *argv);
137 break;
138 }
139 len = strlen(*argv);
140 if (len > sizeof(newname) - 3) {
141 cwarnx("%s: name too long", *argv);
142 break;
143 }
144 memmove(newname, *argv, len);
145 newname[len] = '.';
146 newname[len + 1] = 'Z';
147 newname[len + 2] = '\0';
148 compress(*argv, newname, bits);
149 break;
150 case DECOMPRESS:
151 if (strcmp(*argv, "-") == 0) {
152 decompress("/dev/stdin", "/dev/stdout", bits);
153 break;
154 }
155 len = strlen(*argv);
156 if ((p = strrchr(*argv, '.')) == NULL ||
157 strcmp(p, ".Z")) {
158 if (len > sizeof(newname) - 3) {
159 cwarnx("%s: name too long", *argv);
160 break;
161 }
162 memmove(newname, *argv, len);
163 newname[len] = '.';
164 newname[len + 1] = 'Z';
165 newname[len + 2] = '\0';
166 decompress(newname,
167 cat ? "/dev/stdout" : *argv, bits);
168 } else {
169 if (len - 2 > sizeof(newname) - 1) {
170 cwarnx("%s: name too long", *argv);
171 break;
172 }
173 memmove(newname, *argv, len - 2);
174 newname[len - 2] = '\0';
175 decompress(*argv,
176 cat ? "/dev/stdout" : newname, bits);
177 }
178 break;
179 }
180 exit (eval);
181 }
182
183 static void
compress(const char * in,const char * out,int bits)184 compress(const char *in, const char *out, int bits)
185 {
186 size_t nr;
187 struct stat isb, sb;
188 FILE *ifp, *ofp;
189 int exists, isreg, oreg;
190 u_char buf[1024];
191
192 exists = !stat(out, &sb);
193 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
194 return;
195 isreg = oreg = !exists || S_ISREG(sb.st_mode);
196
197 ifp = ofp = NULL;
198 if ((ifp = fopen(in, "r")) == NULL) {
199 cwarn("%s", in);
200 return;
201 }
202 if (stat(in, &isb)) { /* DON'T FSTAT! */
203 cwarn("%s", in);
204 goto err;
205 }
206 if (!S_ISREG(isb.st_mode))
207 isreg = 0;
208
209 if ((ofp = zopen(out, "w", bits)) == NULL) {
210 cwarn("%s", out);
211 goto err;
212 }
213 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
214 if (fwrite(buf, 1, nr, ofp) != nr) {
215 cwarn("%s", out);
216 goto err;
217 }
218
219 if (ferror(ifp) || fclose(ifp)) {
220 cwarn("%s", in);
221 goto err;
222 }
223 ifp = NULL;
224
225 if (fclose(ofp)) {
226 cwarn("%s", out);
227 goto err;
228 }
229 ofp = NULL;
230
231 if (isreg) {
232 if (stat(out, &sb)) {
233 cwarn("%s", out);
234 goto err;
235 }
236
237 if (!force && sb.st_size >= isb.st_size) {
238 if (verbose)
239 (void)fprintf(stderr, "%s: file would grow; left unmodified\n",
240 in);
241 eval = 2;
242 if (unlink(out))
243 cwarn("%s", out);
244 goto err;
245 }
246
247 setfile(out, &isb);
248
249 if (unlink(in))
250 cwarn("%s", in);
251
252 if (verbose) {
253 (void)fprintf(stderr, "%s: ", out);
254 if (isb.st_size > sb.st_size)
255 (void)fprintf(stderr, "%.0f%% compression\n",
256 ((float)sb.st_size / isb.st_size) * 100.0);
257 else
258 (void)fprintf(stderr, "%.0f%% expansion\n",
259 ((float)isb.st_size / sb.st_size) * 100.0);
260 }
261 }
262 return;
263
264 err: if (ofp) {
265 if (oreg)
266 (void)unlink(out);
267 (void)fclose(ofp);
268 }
269 if (ifp)
270 (void)fclose(ifp);
271 }
272
273 static void
decompress(const char * in,const char * out,int bits)274 decompress(const char *in, const char *out, int bits)
275 {
276 size_t nr;
277 struct stat sb;
278 FILE *ifp, *ofp;
279 int exists, isreg, oreg;
280 u_char buf[1024];
281
282 exists = !stat(out, &sb);
283 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out))
284 return;
285 isreg = oreg = !exists || S_ISREG(sb.st_mode);
286
287 ifp = ofp = NULL;
288 if ((ofp = fopen(out, "w")) == NULL) {
289 cwarn("%s", out);
290 return;
291 }
292
293 if ((ifp = zopen(in, "r", bits)) == NULL) {
294 cwarn("%s", in);
295 goto err;
296 }
297 if (stat(in, &sb)) {
298 cwarn("%s", in);
299 goto err;
300 }
301 if (!S_ISREG(sb.st_mode))
302 isreg = 0;
303
304 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0)
305 if (fwrite(buf, 1, nr, ofp) != nr) {
306 cwarn("%s", out);
307 goto err;
308 }
309
310 if (ferror(ifp) || fclose(ifp)) {
311 cwarn("%s", in);
312 goto err;
313 }
314 ifp = NULL;
315
316 if (fclose(ofp)) {
317 cwarn("%s", out);
318 goto err;
319 }
320
321 if (isreg) {
322 setfile(out, &sb);
323
324 if (unlink(in))
325 cwarn("%s", in);
326 }
327 return;
328
329 err: if (ofp) {
330 if (oreg)
331 (void)unlink(out);
332 (void)fclose(ofp);
333 }
334 if (ifp)
335 (void)fclose(ifp);
336 }
337
338 static void
setfile(const char * name,struct stat * fs)339 setfile(const char *name, struct stat *fs)
340 {
341 static struct timeval tv[2];
342
343 fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
344
345 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
346 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
347 if (utimes(name, tv))
348 cwarn("utimes: %s", name);
349
350 /*
351 * Changing the ownership probably won't succeed, unless we're root
352 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
353 * the mode; current BSD behavior is to remove all setuid bits on
354 * chown. If chown fails, lose setuid/setgid bits.
355 */
356 if (chown(name, fs->st_uid, fs->st_gid)) {
357 if (errno != EPERM)
358 cwarn("chown: %s", name);
359 fs->st_mode &= ~(S_ISUID|S_ISGID);
360 }
361 if (chmod(name, fs->st_mode) && errno != EOPNOTSUPP)
362 cwarn("chmod: %s", name);
363
364 if (chflags(name, fs->st_flags) && errno != EOPNOTSUPP)
365 cwarn("chflags: %s", name);
366 }
367
368 static int
permission(const char * fname)369 permission(const char *fname)
370 {
371 int ch, first;
372
373 if (!isatty(fileno(stderr)))
374 return (0);
375 (void)fprintf(stderr, "overwrite %s? ", fname);
376 first = ch = getchar();
377 while (ch != '\n' && ch != EOF)
378 ch = getchar();
379 return (first == 'y');
380 }
381
382 static void
usage(int iscompress)383 usage(int iscompress)
384 {
385 if (iscompress)
386 (void)fprintf(stderr,
387 "usage: compress [-cfv] [-b bits] [file ...]\n");
388 else
389 (void)fprintf(stderr,
390 "usage: uncompress [-c] [-b bits] [file ...]\n");
391 exit(1);
392 }
393
394 static void
cwarnx(const char * fmt,...)395 cwarnx(const char *fmt, ...)
396 {
397 va_list ap;
398
399 va_start(ap, fmt);
400 vwarnx(fmt, ap);
401 va_end(ap);
402 eval = 1;
403 }
404
405 static void
cwarn(const char * fmt,...)406 cwarn(const char *fmt, ...)
407 {
408 va_list ap;
409
410 va_start(ap, fmt);
411 vwarn(fmt, ap);
412 va_end(ap);
413 eval = 1;
414 }
415