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. 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
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 * $DragonFly: src/usr.bin/compress/compress.c,v 1.4 2004/08/30 18:06:49 eirikn Exp $
35 #include <sys/param.h>
49 void compress(const char *, const char *, int);
50 void cwarn(const char *, ...) __printflike(1, 2);
51 void cwarnx(const char *, ...) __printflike(1, 2);
52 void decompress(const char *, const char *, int);
53 int permission(const char *);
54 void setfile(const char *, struct stat
*);
57 int eval
, force
, verbose
;
60 main(int argc
, char **argv
)
62 enum {COMPRESS
, DECOMPRESS
} style
;
65 char *p
, newname
[MAXPATHLEN
];
68 if ((p
= strrchr(argv
[0], '/')) == NULL
)
72 if (!strcmp(p
, "uncompress"))
74 else if (!strcmp(p
, "compress"))
76 else if (!strcmp(p
, "zcat")) {
80 errx(1, "unknown program name");
83 while ((ch
= getopt(argc
, argv
, "b:cdfv")) != -1)
86 bits
= strtol(optarg
, &p
, 10);
88 errx(1, "illegal bit count -- %s", optarg
);
93 case 'd': /* Backward compatible. */
104 usage(style
== COMPRESS
);
112 (void)compress("/dev/stdin", "/dev/stdout", bits
);
115 (void)decompress("/dev/stdin", "/dev/stdout", bits
);
121 if (cat
== 1 && argc
> 1)
122 errx(1, "the -c option permits only a single file argument");
124 for (; *argv
; ++argv
)
127 if (strcmp(*argv
, "-") == 0) {
128 compress("/dev/stdin", "/dev/stdout", bits
);
131 compress(*argv
, "/dev/stdout", bits
);
134 if ((p
= strrchr(*argv
, '.')) != NULL
&&
136 cwarnx("%s: name already has trailing .Z",
141 if (len
> sizeof(newname
) - 3) {
142 cwarnx("%s: name too long", *argv
);
145 memmove(newname
, *argv
, len
);
147 newname
[len
+ 1] = 'Z';
148 newname
[len
+ 2] = '\0';
149 compress(*argv
, newname
, bits
);
152 if (strcmp(*argv
, "-") == 0) {
153 decompress("/dev/stdin", "/dev/stdout", bits
);
157 if ((p
= strrchr(*argv
, '.')) == NULL
||
159 if (len
> sizeof(newname
) - 3) {
160 cwarnx("%s: name too long", *argv
);
163 memmove(newname
, *argv
, len
);
165 newname
[len
+ 1] = 'Z';
166 newname
[len
+ 2] = '\0';
168 cat
? "/dev/stdout" : *argv
, bits
);
170 if (len
- 2 > sizeof(newname
) - 1) {
171 cwarnx("%s: name too long", *argv
);
174 memmove(newname
, *argv
, len
- 2);
175 newname
[len
- 2] = '\0';
177 cat
? "/dev/stdout" : newname
, bits
);
185 compress(const char *in
, const char *out
, int bits
)
190 int exists
, isreg
, oreg
;
193 exists
= !stat(out
, &sb
);
194 if (!force
&& exists
&& S_ISREG(sb
.st_mode
) && !permission(out
))
196 isreg
= oreg
= !exists
|| S_ISREG(sb
.st_mode
);
199 if ((ifp
= fopen(in
, "r")) == NULL
) {
203 if (stat(in
, &isb
)) { /* DON'T FSTAT! */
207 if (!S_ISREG(isb
.st_mode
))
210 if ((ofp
= zopen(out
, "w", bits
)) == NULL
) {
214 while ((nr
= fread(buf
, 1, sizeof(buf
), ifp
)) != 0)
215 if (fwrite(buf
, 1, nr
, ofp
) != nr
) {
220 if (ferror(ifp
) || fclose(ifp
)) {
233 if (stat(out
, &sb
)) {
238 if (!force
&& sb
.st_size
>= isb
.st_size
) {
240 (void)fprintf(stderr
, "%s: file would grow; left unmodified\n",
254 (void)fprintf(stderr
, "%s: ", out
);
255 if (isb
.st_size
> sb
.st_size
)
256 (void)fprintf(stderr
, "%.0f%% compression\n",
257 ((float)sb
.st_size
/ isb
.st_size
) * 100.0);
259 (void)fprintf(stderr
, "%.0f%% expansion\n",
260 ((float)isb
.st_size
/ sb
.st_size
) * 100.0);
275 decompress(const char *in
, const char *out
, int bits
)
280 int exists
, isreg
, oreg
;
283 exists
= !stat(out
, &sb
);
284 if (!force
&& exists
&& S_ISREG(sb
.st_mode
) && !permission(out
))
286 isreg
= oreg
= !exists
|| S_ISREG(sb
.st_mode
);
289 if ((ofp
= fopen(out
, "w")) == NULL
) {
294 if ((ifp
= zopen(in
, "r", bits
)) == NULL
) {
302 if (!S_ISREG(sb
.st_mode
))
305 while ((nr
= fread(buf
, 1, sizeof(buf
), ifp
)) != 0)
306 if (fwrite(buf
, 1, nr
, ofp
) != nr
) {
311 if (ferror(ifp
) || fclose(ifp
)) {
340 setfile(const char *name
, struct stat
*fs
)
342 static struct timeval tv
[2];
344 fs
->st_mode
&= S_ISUID
|S_ISGID
|S_IRWXU
|S_IRWXG
|S_IRWXO
;
346 TIMESPEC_TO_TIMEVAL(&tv
[0], &fs
->st_atimespec
);
347 TIMESPEC_TO_TIMEVAL(&tv
[1], &fs
->st_mtimespec
);
348 if (utimes(name
, tv
))
349 cwarn("utimes: %s", name
);
352 * Changing the ownership probably won't succeed, unless we're root
353 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
354 * the mode; current BSD behavior is to remove all setuid bits on
355 * chown. If chown fails, lose setuid/setgid bits.
357 if (chown(name
, fs
->st_uid
, fs
->st_gid
)) {
359 cwarn("chown: %s", name
);
360 fs
->st_mode
&= ~(S_ISUID
|S_ISGID
);
362 if (chmod(name
, fs
->st_mode
) && errno
!= EOPNOTSUPP
)
363 cwarn("chmod: %s", name
);
365 if (chflags(name
, fs
->st_flags
) && errno
!= EOPNOTSUPP
)
366 cwarn("chflags: %s", name
);
370 permission(const char *fname
)
374 if (!isatty(fileno(stderr
)))
376 (void)fprintf(stderr
, "overwrite %s? ", fname
);
377 first
= ch
= getchar();
378 while (ch
!= '\n' && ch
!= EOF
)
380 return (first
== 'y');
384 usage(int iscompress
)
387 (void)fprintf(stderr
,
388 "usage: compress [-cfv] [-b bits] [file ...]\n");
390 (void)fprintf(stderr
,
391 "usage: uncompress [-c] [-b bits] [file ...]\n");
396 cwarnx(const char *fmt
, ...)
407 cwarn(const char *fmt
, ...)