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. 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. 20 * 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 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1992, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94"; 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/time.h> 46 #include <sys/stat.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #ifdef __STDC__ 56 #include <stdarg.h> 57 #else 58 #include <varargs.h> 59 #endif 60 61 void compress __P((char *, char *, int)); 62 void cwarn __P((const char *, ...)); 63 void cwarnx __P((const char *, ...)); 64 void decompress __P((char *, char *, int)); 65 int permission __P((char *)); 66 void setfile __P((char *, struct stat *)); 67 void usage __P((int)); 68 69 int eval, force, verbose; 70 71 int 72 main(argc, argv) 73 int argc; 74 char *argv[]; 75 { 76 enum {COMPRESS, DECOMPRESS} style; 77 size_t len; 78 int bits, cat, ch; 79 char *p, newname[MAXPATHLEN]; 80 81 if ((p = rindex(argv[0], '/')) == NULL) 82 p = argv[0]; 83 else 84 ++p; 85 if (!strcmp(p, "uncompress")) 86 style = DECOMPRESS; 87 else if (!strcmp(p, "compress")) 88 style = COMPRESS; 89 else 90 errx(1, "unknown program name"); 91 92 bits = cat = 0; 93 while ((ch = getopt(argc, argv, "b:cdfv")) != EOF) 94 switch(ch) { 95 case 'b': 96 bits = strtol(optarg, &p, 10); 97 if (*p) 98 errx(1, "illegal bit count -- %s", optarg); 99 break; 100 case 'c': 101 cat = 1; 102 break; 103 case 'd': /* Backward compatible. */ 104 style = DECOMPRESS; 105 break; 106 case 'f': 107 force = 1; 108 break; 109 case 'v': 110 verbose = 1; 111 break; 112 case '?': 113 default: 114 usage(style == COMPRESS); 115 } 116 argc -= optind; 117 argv += optind; 118 119 if (argc == 0) { 120 switch(style) { 121 case COMPRESS: 122 (void)compress("/dev/stdin", "/dev/stdout", bits); 123 break; 124 case DECOMPRESS: 125 (void)decompress("/dev/stdin", "/dev/stdout", bits); 126 break; 127 } 128 exit (eval); 129 } 130 131 if (cat == 1 && argc > 1) 132 errx(1, "the -c option permits only a single file argument"); 133 134 for (; *argv; ++argv) 135 switch(style) { 136 case COMPRESS: 137 if (cat) { 138 compress(*argv, "/dev/stdout", bits); 139 break; 140 } 141 if ((p = rindex(*argv, '.')) != NULL && 142 !strcmp(p, ".Z")) { 143 cwarnx("%s: name already has trailing .Z", 144 *argv); 145 break; 146 } 147 len = strlen(*argv); 148 if (len > sizeof(newname) - 3) { 149 cwarnx("%s: name too long", *argv); 150 break; 151 } 152 memmove(newname, *argv, len); 153 newname[len] = '.'; 154 newname[len + 1] = 'Z'; 155 newname[len + 2] = '\0'; 156 compress(*argv, newname, bits); 157 break; 158 case DECOMPRESS: 159 len = strlen(*argv); 160 if ((p = rindex(*argv, '.')) == NULL || 161 strcmp(p, ".Z")) { 162 if (len > sizeof(newname) - 3) { 163 cwarnx("%s: name too long", *argv); 164 break; 165 } 166 memmove(newname, *argv, len); 167 newname[len] = '.'; 168 newname[len + 1] = 'Z'; 169 newname[len + 2] = '\0'; 170 decompress(newname, 171 cat ? "/dev/stdout" : *argv, bits); 172 } else { 173 if (len - 2 > sizeof(newname) - 1) { 174 cwarnx("%s: name too long", *argv); 175 break; 176 } 177 memmove(newname, *argv, len - 2); 178 newname[len - 2] = '\0'; 179 decompress(*argv, 180 cat ? "/dev/stdout" : newname, bits); 181 } 182 break; 183 } 184 exit (eval); 185 } 186 187 void 188 compress(in, out, bits) 189 char *in, *out; 190 int bits; 191 { 192 register int nr; 193 struct stat isb, sb; 194 FILE *ifp, *ofp; 195 int exists, isreg, oreg; 196 u_char buf[1024]; 197 198 exists = !stat(out, &sb); 199 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out)) 200 return; 201 isreg = oreg = !exists || S_ISREG(sb.st_mode); 202 203 ifp = ofp = NULL; 204 if ((ifp = fopen(in, "r")) == NULL) { 205 cwarn("%s", in); 206 return; 207 } 208 if (stat(in, &isb)) { /* DON'T FSTAT! */ 209 cwarn("%s", in); 210 goto err; 211 } 212 if (!S_ISREG(isb.st_mode)) 213 isreg = 0; 214 215 if ((ofp = zopen(out, "w", bits)) == NULL) { 216 cwarn("%s", out); 217 goto err; 218 } 219 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) 220 if (fwrite(buf, 1, nr, ofp) != nr) { 221 cwarn("%s", out); 222 goto err; 223 } 224 225 if (ferror(ifp) || fclose(ifp)) { 226 cwarn("%s", in); 227 goto err; 228 } 229 ifp = NULL; 230 231 if (fclose(ofp)) { 232 cwarn("%s", out); 233 goto err; 234 } 235 ofp = NULL; 236 237 if (isreg) { 238 if (stat(out, &sb)) { 239 cwarn("%s", out); 240 goto err; 241 } 242 243 if (!force && sb.st_size >= isb.st_size) { 244 if (verbose) 245 (void)printf("%s: file would grow; left unmodified\n", in); 246 if (unlink(out)) 247 cwarn("%s", out); 248 goto err; 249 } 250 251 setfile(out, &isb); 252 253 if (unlink(in)) 254 cwarn("%s", in); 255 256 if (verbose) { 257 (void)printf("%s: ", out); 258 if (isb.st_size > sb.st_size) 259 (void)printf("%.0f%% compression\n", 260 ((float)sb.st_size / isb.st_size) * 100.0); 261 else 262 (void)printf("%.0f%% expansion\n", 263 ((float)isb.st_size / sb.st_size) * 100.0); 264 } 265 } 266 return; 267 268 err: if (ofp) { 269 if (oreg) 270 (void)unlink(out); 271 (void)fclose(ofp); 272 } 273 if (ifp) 274 (void)fclose(ifp); 275 } 276 277 void 278 decompress(in, out, bits) 279 char *in, *out; 280 int bits; 281 { 282 register int nr; 283 struct stat sb; 284 FILE *ifp, *ofp; 285 int exists, isreg, oreg; 286 u_char buf[1024]; 287 288 exists = !stat(out, &sb); 289 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out)) 290 return; 291 isreg = oreg = !exists || S_ISREG(sb.st_mode); 292 293 ifp = ofp = NULL; 294 if ((ofp = fopen(out, "w")) == NULL) { 295 cwarn("%s", out); 296 return; 297 } 298 299 if ((ifp = zopen(in, "r", bits)) == NULL) { 300 cwarn("%s", in); 301 goto err; 302 } 303 if (stat(in, &sb)) { 304 cwarn("%s", in); 305 goto err; 306 } 307 if (!S_ISREG(sb.st_mode)) 308 isreg = 0; 309 310 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) 311 if (fwrite(buf, 1, nr, ofp) != nr) { 312 cwarn("%s", out); 313 goto err; 314 } 315 316 if (ferror(ifp) || fclose(ifp)) { 317 cwarn("%s", in); 318 goto err; 319 } 320 ifp = NULL; 321 322 if (fclose(ofp)) { 323 cwarn("%s", out); 324 goto err; 325 } 326 327 if (isreg) { 328 setfile(out, &sb); 329 330 if (unlink(in)) 331 cwarn("%s", in); 332 } 333 return; 334 335 err: if (ofp) { 336 if (oreg) 337 (void)unlink(out); 338 (void)fclose(ofp); 339 } 340 if (ifp) 341 (void)fclose(ifp); 342 } 343 344 void 345 setfile(name, fs) 346 char *name; 347 register struct stat *fs; 348 { 349 static struct timeval tv[2]; 350 351 fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; 352 353 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 354 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 355 if (utimes(name, tv)) 356 cwarn("utimes: %s", name); 357 358 /* 359 * Changing the ownership probably won't succeed, unless we're root 360 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 361 * the mode; current BSD behavior is to remove all setuid bits on 362 * chown. If chown fails, lose setuid/setgid bits. 363 */ 364 if (chown(name, fs->st_uid, fs->st_gid)) { 365 if (errno != EPERM) 366 cwarn("chown: %s", name); 367 fs->st_mode &= ~(S_ISUID|S_ISGID); 368 } 369 if (chmod(name, fs->st_mode)) 370 cwarn("chown: %s", name); 371 372 if (chflags(name, fs->st_flags)) 373 cwarn("chflags: %s", name); 374 } 375 376 int 377 permission(fname) 378 char *fname; 379 { 380 int ch, first; 381 382 if (!isatty(fileno(stderr))) 383 return (0); 384 (void)fprintf(stderr, "overwrite %s? ", fname); 385 first = ch = getchar(); 386 while (ch != '\n' && ch != EOF) 387 ch = getchar(); 388 return (first == 'y'); 389 } 390 391 void 392 usage(iscompress) 393 int iscompress; 394 { 395 if (iscompress) 396 (void)fprintf(stderr, 397 "usage: compress [-cfv] [-b bits] [file ...]\n"); 398 else 399 (void)fprintf(stderr, 400 "usage: uncompress [-c] [-b bits] [file ...]\n"); 401 exit(1); 402 } 403 404 void 405 #if __STDC__ 406 cwarnx(const char *fmt, ...) 407 #else 408 cwarnx(fmt, va_alist) 409 int eval; 410 const char *fmt; 411 va_dcl 412 #endif 413 { 414 va_list ap; 415 #if __STDC__ 416 va_start(ap, fmt); 417 #else 418 va_start(ap); 419 #endif 420 vwarnx(fmt, ap); 421 va_end(ap); 422 eval = 1; 423 } 424 425 void 426 #if __STDC__ 427 cwarn(const char *fmt, ...) 428 #else 429 cwarn(fmt, va_alist) 430 int eval; 431 const char *fmt; 432 va_dcl 433 #endif 434 { 435 va_list ap; 436 #if __STDC__ 437 va_start(ap, fmt); 438 #else 439 va_start(ap); 440 #endif 441 vwarn(fmt, ap); 442 va_end(ap); 443 eval = 1; 444 } 445