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 * 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. 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 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1992, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif 35 36 #if 0 37 #ifndef lint 38 static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94"; 39 #endif 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 #include <sys/time.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <stdarg.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include "zopen.h" 58 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 *); 65 void usage(int); 66 67 int eval, force, verbose; 68 69 int 70 main(int argc, char *argv[]) 71 { 72 enum {COMPRESS, DECOMPRESS} style; 73 size_t len; 74 int bits, cat, ch; 75 char *p, newname[MAXPATHLEN]; 76 77 cat = 0; 78 if ((p = rindex(argv[0], '/')) == NULL) 79 p = argv[0]; 80 else 81 ++p; 82 if (!strcmp(p, "uncompress")) 83 style = DECOMPRESS; 84 else if (!strcmp(p, "compress")) 85 style = COMPRESS; 86 else if (!strcmp(p, "zcat")) { 87 cat = 1; 88 style = DECOMPRESS; 89 } else 90 errx(1, "unknown program name"); 91 92 bits = 0; 93 while ((ch = getopt(argc, argv, "b:cdfv")) != -1) 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 (strcmp(*argv, "-") == 0) { 138 compress("/dev/stdin", "/dev/stdout", bits); 139 break; 140 } else if (cat) { 141 compress(*argv, "/dev/stdout", bits); 142 break; 143 } 144 if ((p = rindex(*argv, '.')) != NULL && 145 !strcmp(p, ".Z")) { 146 cwarnx("%s: name already has trailing .Z", 147 *argv); 148 break; 149 } 150 len = strlen(*argv); 151 if (len > sizeof(newname) - 3) { 152 cwarnx("%s: name too long", *argv); 153 break; 154 } 155 memmove(newname, *argv, len); 156 newname[len] = '.'; 157 newname[len + 1] = 'Z'; 158 newname[len + 2] = '\0'; 159 compress(*argv, newname, bits); 160 break; 161 case DECOMPRESS: 162 if (strcmp(*argv, "-") == 0) { 163 decompress("/dev/stdin", "/dev/stdout", bits); 164 break; 165 } 166 len = strlen(*argv); 167 if ((p = rindex(*argv, '.')) == NULL || 168 strcmp(p, ".Z")) { 169 if (len > sizeof(newname) - 3) { 170 cwarnx("%s: name too long", *argv); 171 break; 172 } 173 memmove(newname, *argv, len); 174 newname[len] = '.'; 175 newname[len + 1] = 'Z'; 176 newname[len + 2] = '\0'; 177 decompress(newname, 178 cat ? "/dev/stdout" : *argv, bits); 179 } else { 180 if (len - 2 > sizeof(newname) - 1) { 181 cwarnx("%s: name too long", *argv); 182 break; 183 } 184 memmove(newname, *argv, len - 2); 185 newname[len - 2] = '\0'; 186 decompress(*argv, 187 cat ? "/dev/stdout" : newname, bits); 188 } 189 break; 190 } 191 exit (eval); 192 } 193 194 void 195 compress(const char *in, const char *out, int bits) 196 { 197 size_t nr; 198 struct stat isb, sb; 199 FILE *ifp, *ofp; 200 int exists, isreg, oreg; 201 u_char buf[1024]; 202 203 exists = !stat(out, &sb); 204 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out)) 205 return; 206 isreg = oreg = !exists || S_ISREG(sb.st_mode); 207 208 ifp = ofp = NULL; 209 if ((ifp = fopen(in, "r")) == NULL) { 210 cwarn("%s", in); 211 return; 212 } 213 if (stat(in, &isb)) { /* DON'T FSTAT! */ 214 cwarn("%s", in); 215 goto err; 216 } 217 if (!S_ISREG(isb.st_mode)) 218 isreg = 0; 219 220 if ((ofp = zopen(out, "w", bits)) == NULL) { 221 cwarn("%s", out); 222 goto err; 223 } 224 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) 225 if (fwrite(buf, 1, nr, ofp) != nr) { 226 cwarn("%s", out); 227 goto err; 228 } 229 230 if (ferror(ifp) || fclose(ifp)) { 231 cwarn("%s", in); 232 goto err; 233 } 234 ifp = NULL; 235 236 if (fclose(ofp)) { 237 cwarn("%s", out); 238 goto err; 239 } 240 ofp = NULL; 241 242 if (isreg) { 243 if (stat(out, &sb)) { 244 cwarn("%s", out); 245 goto err; 246 } 247 248 if (!force && sb.st_size >= isb.st_size) { 249 if (verbose) 250 (void)fprintf(stderr, "%s: file would grow; left unmodified\n", 251 in); 252 eval = 2; 253 if (unlink(out)) 254 cwarn("%s", out); 255 goto err; 256 } 257 258 setfile(out, &isb); 259 260 if (unlink(in)) 261 cwarn("%s", in); 262 263 if (verbose) { 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); 268 else 269 (void)fprintf(stderr, "%.0f%% expansion\n", 270 ((float)isb.st_size / sb.st_size) * 100.0); 271 } 272 } 273 return; 274 275 err: if (ofp) { 276 if (oreg) 277 (void)unlink(out); 278 (void)fclose(ofp); 279 } 280 if (ifp) 281 (void)fclose(ifp); 282 } 283 284 void 285 decompress(const char *in, const char *out, int bits) 286 { 287 size_t nr; 288 struct stat sb; 289 FILE *ifp, *ofp; 290 int exists, isreg, oreg; 291 u_char buf[1024]; 292 293 exists = !stat(out, &sb); 294 if (!force && exists && S_ISREG(sb.st_mode) && !permission(out)) 295 return; 296 isreg = oreg = !exists || S_ISREG(sb.st_mode); 297 298 ifp = ofp = NULL; 299 if ((ifp = zopen(in, "r", bits)) == NULL) { 300 cwarn("%s", in); 301 return; 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 /* 311 * Try to read the first few uncompressed bytes from the input file 312 * before blindly truncating the output file. 313 */ 314 if ((nr = fread(buf, 1, sizeof(buf), ifp)) == 0) { 315 cwarn("%s", in); 316 (void)fclose(ifp); 317 return; 318 } 319 if ((ofp = fopen(out, "w")) == NULL || 320 (nr != 0 && fwrite(buf, 1, nr, ofp) != nr)) { 321 cwarn("%s", out); 322 (void)fclose(ifp); 323 return; 324 } 325 326 while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) 327 if (fwrite(buf, 1, nr, ofp) != nr) { 328 cwarn("%s", out); 329 goto err; 330 } 331 332 if (ferror(ifp) || fclose(ifp)) { 333 cwarn("%s", in); 334 goto err; 335 } 336 ifp = NULL; 337 338 if (fclose(ofp)) { 339 cwarn("%s", out); 340 goto err; 341 } 342 343 if (isreg) { 344 setfile(out, &sb); 345 346 if (unlink(in)) 347 cwarn("%s", in); 348 } 349 return; 350 351 err: if (ofp) { 352 if (oreg) 353 (void)unlink(out); 354 (void)fclose(ofp); 355 } 356 if (ifp) 357 (void)fclose(ifp); 358 } 359 360 void 361 setfile(const char *name, struct stat *fs) 362 { 363 static struct timeval tv[2]; 364 365 fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; 366 367 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); 371 372 /* 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. 377 */ 378 if (chown(name, fs->st_uid, fs->st_gid)) { 379 if (errno != EPERM) 380 cwarn("chown: %s", name); 381 fs->st_mode &= ~(S_ISUID|S_ISGID); 382 } 383 if (chmod(name, fs->st_mode) && errno != EOPNOTSUPP) 384 cwarn("chmod: %s", name); 385 386 if (chflags(name, fs->st_flags) && errno != EOPNOTSUPP) 387 cwarn("chflags: %s", name); 388 } 389 390 int 391 permission(const char *fname) 392 { 393 int ch, first; 394 395 if (!isatty(fileno(stderr))) 396 return (0); 397 (void)fprintf(stderr, "overwrite %s? ", fname); 398 first = ch = getchar(); 399 while (ch != '\n' && ch != EOF) 400 ch = getchar(); 401 return (first == 'y'); 402 } 403 404 void 405 usage(int iscompress) 406 { 407 if (iscompress) 408 (void)fprintf(stderr, 409 "usage: compress [-cfv] [-b bits] [file ...]\n"); 410 else 411 (void)fprintf(stderr, 412 "usage: uncompress [-c] [-b bits] [file ...]\n"); 413 exit(1); 414 } 415 416 void 417 cwarnx(const char *fmt, ...) 418 { 419 va_list ap; 420 421 va_start(ap, fmt); 422 vwarnx(fmt, ap); 423 va_end(ap); 424 eval = 1; 425 } 426 427 void 428 cwarn(const char *fmt, ...) 429 { 430 va_list ap; 431 432 va_start(ap, fmt); 433 vwarn(fmt, ap); 434 va_end(ap); 435 eval = 1; 436 } 437