1 /* $NetBSD: gzip.c,v 1.112 2017/08/23 13:04:17 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017 5 * Matthew R. Green 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * 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 31 #include <sys/cdefs.h> 32 #ifndef lint 33 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\ 34 2009, 2010, 2011, 2015, 2017 Matthew R. Green. All rights reserved."); 35 __FBSDID("$FreeBSD$"); 36 #endif /* not lint */ 37 38 /* 39 * gzip.c -- GPL free gzip using zlib. 40 * 41 * RFC 1950 covers the zlib format 42 * RFC 1951 covers the deflate format 43 * RFC 1952 covers the gzip format 44 * 45 * TODO: 46 * - use mmap where possible 47 * - make bzip2/compress -v/-t/-l support work as well as possible 48 */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 54 #include <inttypes.h> 55 #include <unistd.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <stdlib.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <zlib.h> 63 #include <fts.h> 64 #include <libgen.h> 65 #include <stdarg.h> 66 #include <getopt.h> 67 #include <time.h> 68 69 /* what type of file are we dealing with */ 70 enum filetype { 71 FT_GZIP, 72 #ifndef NO_BZIP2_SUPPORT 73 FT_BZIP2, 74 #endif 75 #ifndef NO_COMPRESS_SUPPORT 76 FT_Z, 77 #endif 78 #ifndef NO_PACK_SUPPORT 79 FT_PACK, 80 #endif 81 #ifndef NO_XZ_SUPPORT 82 FT_XZ, 83 #endif 84 FT_LAST, 85 FT_UNKNOWN 86 }; 87 88 #ifndef NO_BZIP2_SUPPORT 89 #include <bzlib.h> 90 91 #define BZ2_SUFFIX ".bz2" 92 #define BZIP2_MAGIC "BZh" 93 #endif 94 95 #ifndef NO_COMPRESS_SUPPORT 96 #define Z_SUFFIX ".Z" 97 #define Z_MAGIC "\037\235" 98 #endif 99 100 #ifndef NO_PACK_SUPPORT 101 #define PACK_MAGIC "\037\036" 102 #endif 103 104 #ifndef NO_XZ_SUPPORT 105 #include <lzma.h> 106 #define XZ_SUFFIX ".xz" 107 #define XZ_MAGIC "\3757zXZ" 108 #endif 109 110 #define GZ_SUFFIX ".gz" 111 112 #define BUFLEN (64 * 1024) 113 114 #define GZIP_MAGIC0 0x1F 115 #define GZIP_MAGIC1 0x8B 116 #define GZIP_OMAGIC1 0x9E 117 118 #define GZIP_TIMESTAMP (off_t)4 119 #define GZIP_ORIGNAME (off_t)10 120 121 #define HEAD_CRC 0x02 122 #define EXTRA_FIELD 0x04 123 #define ORIG_NAME 0x08 124 #define COMMENT 0x10 125 126 #define OS_CODE 3 /* Unix */ 127 128 typedef struct { 129 const char *zipped; 130 int ziplen; 131 const char *normal; /* for unzip - must not be longer than zipped */ 132 } suffixes_t; 133 static suffixes_t suffixes[] = { 134 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N} 135 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */ 136 #ifndef SMALL 137 SUFFIX(GZ_SUFFIX, ""), 138 SUFFIX(".z", ""), 139 SUFFIX("-gz", ""), 140 SUFFIX("-z", ""), 141 SUFFIX("_z", ""), 142 SUFFIX(".taz", ".tar"), 143 SUFFIX(".tgz", ".tar"), 144 #ifndef NO_BZIP2_SUPPORT 145 SUFFIX(BZ2_SUFFIX, ""), 146 SUFFIX(".tbz", ".tar"), 147 SUFFIX(".tbz2", ".tar"), 148 #endif 149 #ifndef NO_COMPRESS_SUPPORT 150 SUFFIX(Z_SUFFIX, ""), 151 #endif 152 #ifndef NO_XZ_SUPPORT 153 SUFFIX(XZ_SUFFIX, ""), 154 #endif 155 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */ 156 #endif /* SMALL */ 157 #undef SUFFIX 158 }; 159 #define NUM_SUFFIXES (nitems(suffixes)) 160 #define SUFFIX_MAXLEN 30 161 162 static const char gzip_version[] = "FreeBSD gzip 20171121"; 163 164 #ifndef SMALL 165 static const char gzip_copyright[] = \ 166 " Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n" 167 " All rights reserved.\n" 168 "\n" 169 " Redistribution and use in source and binary forms, with or without\n" 170 " modification, are permitted provided that the following conditions\n" 171 " are met:\n" 172 " 1. Redistributions of source code must retain the above copyright\n" 173 " notice, this list of conditions and the following disclaimer.\n" 174 " 2. Redistributions in binary form must reproduce the above copyright\n" 175 " notice, this list of conditions and the following disclaimer in the\n" 176 " documentation and/or other materials provided with the distribution.\n" 177 "\n" 178 " THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n" 179 " IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" 180 " OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" 181 " IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" 182 " INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n" 183 " BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n" 184 " LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n" 185 " AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n" 186 " OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n" 187 " OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n" 188 " SUCH DAMAGE."; 189 #endif 190 191 static int cflag; /* stdout mode */ 192 static int dflag; /* decompress mode */ 193 static int lflag; /* list mode */ 194 static int numflag = 6; /* gzip -1..-9 value */ 195 196 static const char *remove_file = NULL; /* file to be removed upon SIGINT */ 197 198 static int fflag; /* force mode */ 199 #ifndef SMALL 200 static int kflag; /* don't delete input files */ 201 static int nflag; /* don't save name/timestamp */ 202 static int Nflag; /* don't restore name/timestamp */ 203 static int qflag; /* quiet mode */ 204 static int rflag; /* recursive mode */ 205 static int tflag; /* test */ 206 static int vflag; /* verbose mode */ 207 static sig_atomic_t print_info = 0; 208 #else 209 #define qflag 0 210 #define tflag 0 211 #endif 212 213 static int exit_value = 0; /* exit value */ 214 215 static const char *infile; /* name of file coming in */ 216 217 static void maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2; 218 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 219 !defined(NO_XZ_SUPPORT) 220 static void maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2; 221 #endif 222 static void maybe_warn(const char *fmt, ...) __printflike(1, 2); 223 static void maybe_warnx(const char *fmt, ...) __printflike(1, 2); 224 static enum filetype file_gettype(u_char *); 225 #ifdef SMALL 226 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz) 227 #endif 228 static off_t gz_compress(int, int, off_t *, const char *, uint32_t); 229 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *); 230 static off_t file_compress(char *, char *, size_t); 231 static off_t file_uncompress(char *, char *, size_t); 232 static void handle_pathname(char *); 233 static void handle_file(char *, struct stat *); 234 static void handle_stdin(void); 235 static void handle_stdout(void); 236 static void print_ratio(off_t, off_t, FILE *); 237 static void print_list(int fd, off_t, const char *, time_t); 238 static void usage(void) __dead2; 239 static void display_version(void) __dead2; 240 #ifndef SMALL 241 static void display_license(void); 242 #endif 243 static const suffixes_t *check_suffix(char *, int); 244 static ssize_t read_retry(int, void *, size_t); 245 static ssize_t write_retry(int, const void *, size_t); 246 247 #ifdef SMALL 248 #define infile_set(f,t) infile_set(f) 249 #endif 250 static void infile_set(const char *newinfile, off_t total); 251 252 #ifdef SMALL 253 #define unlink_input(f, sb) unlink(f) 254 #define check_siginfo() /* nothing */ 255 #define setup_signals() /* nothing */ 256 #define infile_newdata(t) /* nothing */ 257 #else 258 static off_t infile_total; /* total expected to read/write */ 259 static off_t infile_current; /* current read/write */ 260 261 static void check_siginfo(void); 262 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd); 263 static void prepend_gzip(char *, int *, char ***); 264 static void handle_dir(char *); 265 static void print_verbage(const char *, const char *, off_t, off_t); 266 static void print_test(const char *, int); 267 static void copymodes(int fd, const struct stat *, const char *file); 268 static int check_outfile(const char *outfile); 269 static void setup_signals(void); 270 static void infile_newdata(size_t newdata); 271 static void infile_clear(void); 272 #endif 273 274 #ifndef NO_BZIP2_SUPPORT 275 static off_t unbzip2(int, int, char *, size_t, off_t *); 276 #endif 277 278 #ifndef NO_COMPRESS_SUPPORT 279 static FILE *zdopen(int); 280 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *); 281 #endif 282 283 #ifndef NO_PACK_SUPPORT 284 static off_t unpack(int, int, char *, size_t, off_t *); 285 #endif 286 287 #ifndef NO_XZ_SUPPORT 288 static off_t unxz(int, int, char *, size_t, off_t *); 289 #endif 290 291 #ifdef SMALL 292 #define getopt_long(a,b,c,d,e) getopt(a,b,c) 293 #else 294 static const struct option longopts[] = { 295 { "stdout", no_argument, 0, 'c' }, 296 { "to-stdout", no_argument, 0, 'c' }, 297 { "decompress", no_argument, 0, 'd' }, 298 { "uncompress", no_argument, 0, 'd' }, 299 { "force", no_argument, 0, 'f' }, 300 { "help", no_argument, 0, 'h' }, 301 { "keep", no_argument, 0, 'k' }, 302 { "list", no_argument, 0, 'l' }, 303 { "no-name", no_argument, 0, 'n' }, 304 { "name", no_argument, 0, 'N' }, 305 { "quiet", no_argument, 0, 'q' }, 306 { "recursive", no_argument, 0, 'r' }, 307 { "suffix", required_argument, 0, 'S' }, 308 { "test", no_argument, 0, 't' }, 309 { "verbose", no_argument, 0, 'v' }, 310 { "version", no_argument, 0, 'V' }, 311 { "fast", no_argument, 0, '1' }, 312 { "best", no_argument, 0, '9' }, 313 { "ascii", no_argument, 0, 'a' }, 314 { "license", no_argument, 0, 'L' }, 315 { NULL, no_argument, 0, 0 }, 316 }; 317 #endif 318 319 int 320 main(int argc, char **argv) 321 { 322 const char *progname = getprogname(); 323 #ifndef SMALL 324 char *gzip; 325 int len; 326 #endif 327 int ch; 328 329 setup_signals(); 330 331 #ifndef SMALL 332 if ((gzip = getenv("GZIP")) != NULL) 333 prepend_gzip(gzip, &argc, &argv); 334 #endif 335 336 /* 337 * XXX 338 * handle being called `gunzip', `zcat' and `gzcat' 339 */ 340 if (strcmp(progname, "gunzip") == 0) 341 dflag = 1; 342 else if (strcmp(progname, "zcat") == 0 || 343 strcmp(progname, "gzcat") == 0) 344 dflag = cflag = 1; 345 346 #ifdef SMALL 347 #define OPT_LIST "123456789cdhlV" 348 #else 349 #define OPT_LIST "123456789acdfhklLNnqrS:tVv" 350 #endif 351 352 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) { 353 switch (ch) { 354 case '1': case '2': case '3': 355 case '4': case '5': case '6': 356 case '7': case '8': case '9': 357 numflag = ch - '0'; 358 break; 359 case 'c': 360 cflag = 1; 361 break; 362 case 'd': 363 dflag = 1; 364 break; 365 case 'l': 366 lflag = 1; 367 dflag = 1; 368 break; 369 case 'V': 370 display_version(); 371 /* NOTREACHED */ 372 #ifndef SMALL 373 case 'a': 374 fprintf(stderr, "%s: option --ascii ignored on this system\n", progname); 375 break; 376 case 'f': 377 fflag = 1; 378 break; 379 case 'k': 380 kflag = 1; 381 break; 382 case 'L': 383 display_license(); 384 /* NOT REACHED */ 385 case 'N': 386 nflag = 0; 387 Nflag = 1; 388 break; 389 case 'n': 390 nflag = 1; 391 Nflag = 0; 392 break; 393 case 'q': 394 qflag = 1; 395 break; 396 case 'r': 397 rflag = 1; 398 break; 399 case 'S': 400 len = strlen(optarg); 401 if (len != 0) { 402 if (len > SUFFIX_MAXLEN) 403 errx(1, "incorrect suffix: '%s': too long", optarg); 404 suffixes[0].zipped = optarg; 405 suffixes[0].ziplen = len; 406 } else { 407 suffixes[NUM_SUFFIXES - 1].zipped = ""; 408 suffixes[NUM_SUFFIXES - 1].ziplen = 0; 409 } 410 break; 411 case 't': 412 cflag = 1; 413 tflag = 1; 414 dflag = 1; 415 break; 416 case 'v': 417 vflag = 1; 418 break; 419 #endif 420 default: 421 usage(); 422 /* NOTREACHED */ 423 } 424 } 425 argv += optind; 426 argc -= optind; 427 428 if (argc == 0) { 429 if (dflag) /* stdin mode */ 430 handle_stdin(); 431 else /* stdout mode */ 432 handle_stdout(); 433 } else { 434 do { 435 handle_pathname(argv[0]); 436 } while (*++argv); 437 } 438 #ifndef SMALL 439 if (qflag == 0 && lflag && argc > 1) 440 print_list(-1, 0, "(totals)", 0); 441 #endif 442 exit(exit_value); 443 } 444 445 /* maybe print a warning */ 446 void 447 maybe_warn(const char *fmt, ...) 448 { 449 va_list ap; 450 451 if (qflag == 0) { 452 va_start(ap, fmt); 453 vwarn(fmt, ap); 454 va_end(ap); 455 } 456 if (exit_value == 0) 457 exit_value = 1; 458 } 459 460 /* ... without an errno. */ 461 void 462 maybe_warnx(const char *fmt, ...) 463 { 464 va_list ap; 465 466 if (qflag == 0) { 467 va_start(ap, fmt); 468 vwarnx(fmt, ap); 469 va_end(ap); 470 } 471 if (exit_value == 0) 472 exit_value = 1; 473 } 474 475 /* maybe print an error */ 476 void 477 maybe_err(const char *fmt, ...) 478 { 479 va_list ap; 480 481 if (qflag == 0) { 482 va_start(ap, fmt); 483 vwarn(fmt, ap); 484 va_end(ap); 485 } 486 exit(2); 487 } 488 489 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 490 !defined(NO_XZ_SUPPORT) 491 /* ... without an errno. */ 492 void 493 maybe_errx(const char *fmt, ...) 494 { 495 va_list ap; 496 497 if (qflag == 0) { 498 va_start(ap, fmt); 499 vwarnx(fmt, ap); 500 va_end(ap); 501 } 502 exit(2); 503 } 504 #endif 505 506 #ifndef SMALL 507 /* split up $GZIP and prepend it to the argument list */ 508 static void 509 prepend_gzip(char *gzip, int *argc, char ***argv) 510 { 511 char *s, **nargv, **ac; 512 int nenvarg = 0, i; 513 514 /* scan how many arguments there are */ 515 for (s = gzip;;) { 516 while (*s == ' ' || *s == '\t') 517 s++; 518 if (*s == 0) 519 goto count_done; 520 nenvarg++; 521 while (*s != ' ' && *s != '\t') 522 if (*s++ == 0) 523 goto count_done; 524 } 525 count_done: 526 /* punt early */ 527 if (nenvarg == 0) 528 return; 529 530 *argc += nenvarg; 531 ac = *argv; 532 533 nargv = (char **)malloc((*argc + 1) * sizeof(char *)); 534 if (nargv == NULL) 535 maybe_err("malloc"); 536 537 /* stash this away */ 538 *argv = nargv; 539 540 /* copy the program name first */ 541 i = 0; 542 nargv[i++] = *(ac++); 543 544 /* take a copy of $GZIP and add it to the array */ 545 s = strdup(gzip); 546 if (s == NULL) 547 maybe_err("strdup"); 548 for (;;) { 549 /* Skip whitespaces. */ 550 while (*s == ' ' || *s == '\t') 551 s++; 552 if (*s == 0) 553 goto copy_done; 554 nargv[i++] = s; 555 /* Find the end of this argument. */ 556 while (*s != ' ' && *s != '\t') 557 if (*s++ == 0) 558 /* Argument followed by NUL. */ 559 goto copy_done; 560 /* Terminate by overwriting ' ' or '\t' with NUL. */ 561 *s++ = 0; 562 } 563 copy_done: 564 565 /* copy the original arguments and a NULL */ 566 while (*ac) 567 nargv[i++] = *(ac++); 568 nargv[i] = NULL; 569 } 570 #endif 571 572 /* compress input to output. Return bytes read, -1 on error */ 573 static off_t 574 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime) 575 { 576 z_stream z; 577 char *outbufp, *inbufp; 578 off_t in_tot = 0, out_tot = 0; 579 ssize_t in_size; 580 int i, error; 581 uLong crc; 582 #ifdef SMALL 583 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0, 584 0, 0, 0, 0, 585 0, OS_CODE }; 586 #endif 587 588 outbufp = malloc(BUFLEN); 589 inbufp = malloc(BUFLEN); 590 if (outbufp == NULL || inbufp == NULL) { 591 maybe_err("malloc failed"); 592 goto out; 593 } 594 595 memset(&z, 0, sizeof z); 596 z.zalloc = Z_NULL; 597 z.zfree = Z_NULL; 598 z.opaque = 0; 599 600 #ifdef SMALL 601 memcpy(outbufp, header, sizeof header); 602 i = sizeof header; 603 #else 604 if (nflag != 0) { 605 mtime = 0; 606 origname = ""; 607 } 608 609 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s", 610 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 611 *origname ? ORIG_NAME : 0, 612 mtime & 0xff, 613 (mtime >> 8) & 0xff, 614 (mtime >> 16) & 0xff, 615 (mtime >> 24) & 0xff, 616 numflag == 1 ? 4 : numflag == 9 ? 2 : 0, 617 OS_CODE, origname); 618 if (i >= BUFLEN) 619 /* this need PATH_MAX > BUFLEN ... */ 620 maybe_err("snprintf"); 621 if (*origname) 622 i++; 623 #endif 624 625 z.next_out = (unsigned char *)outbufp + i; 626 z.avail_out = BUFLEN - i; 627 628 error = deflateInit2(&z, numflag, Z_DEFLATED, 629 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY); 630 if (error != Z_OK) { 631 maybe_warnx("deflateInit2 failed"); 632 in_tot = -1; 633 goto out; 634 } 635 636 crc = crc32(0L, Z_NULL, 0); 637 for (;;) { 638 if (z.avail_out == 0) { 639 if (write_retry(out, outbufp, BUFLEN) != BUFLEN) { 640 maybe_warn("write"); 641 out_tot = -1; 642 goto out; 643 } 644 645 out_tot += BUFLEN; 646 z.next_out = (unsigned char *)outbufp; 647 z.avail_out = BUFLEN; 648 } 649 650 if (z.avail_in == 0) { 651 in_size = read(in, inbufp, BUFLEN); 652 if (in_size < 0) { 653 maybe_warn("read"); 654 in_tot = -1; 655 goto out; 656 } 657 if (in_size == 0) 658 break; 659 infile_newdata(in_size); 660 661 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size); 662 in_tot += in_size; 663 z.next_in = (unsigned char *)inbufp; 664 z.avail_in = in_size; 665 } 666 667 error = deflate(&z, Z_NO_FLUSH); 668 if (error != Z_OK && error != Z_STREAM_END) { 669 maybe_warnx("deflate failed"); 670 in_tot = -1; 671 goto out; 672 } 673 } 674 675 /* clean up */ 676 for (;;) { 677 size_t len; 678 ssize_t w; 679 680 error = deflate(&z, Z_FINISH); 681 if (error != Z_OK && error != Z_STREAM_END) { 682 maybe_warnx("deflate failed"); 683 in_tot = -1; 684 goto out; 685 } 686 687 len = (char *)z.next_out - outbufp; 688 689 w = write_retry(out, outbufp, len); 690 if (w == -1 || (size_t)w != len) { 691 maybe_warn("write"); 692 out_tot = -1; 693 goto out; 694 } 695 out_tot += len; 696 z.next_out = (unsigned char *)outbufp; 697 z.avail_out = BUFLEN; 698 699 if (error == Z_STREAM_END) 700 break; 701 } 702 703 if (deflateEnd(&z) != Z_OK) { 704 maybe_warnx("deflateEnd failed"); 705 in_tot = -1; 706 goto out; 707 } 708 709 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c", 710 (int)crc & 0xff, 711 (int)(crc >> 8) & 0xff, 712 (int)(crc >> 16) & 0xff, 713 (int)(crc >> 24) & 0xff, 714 (int)in_tot & 0xff, 715 (int)(in_tot >> 8) & 0xff, 716 (int)(in_tot >> 16) & 0xff, 717 (int)(in_tot >> 24) & 0xff); 718 if (i != 8) 719 maybe_err("snprintf"); 720 if (write_retry(out, outbufp, i) != i) { 721 maybe_warn("write"); 722 in_tot = -1; 723 } else 724 out_tot += i; 725 726 out: 727 if (inbufp != NULL) 728 free(inbufp); 729 if (outbufp != NULL) 730 free(outbufp); 731 if (gsizep) 732 *gsizep = out_tot; 733 return in_tot; 734 } 735 736 /* 737 * uncompress input to output then close the input. return the 738 * uncompressed size written, and put the compressed sized read 739 * into `*gsizep'. 740 */ 741 static off_t 742 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep, 743 const char *filename) 744 { 745 z_stream z; 746 char *outbufp, *inbufp; 747 off_t out_tot = -1, in_tot = 0; 748 uint32_t out_sub_tot = 0; 749 enum { 750 GZSTATE_MAGIC0, 751 GZSTATE_MAGIC1, 752 GZSTATE_METHOD, 753 GZSTATE_FLAGS, 754 GZSTATE_SKIPPING, 755 GZSTATE_EXTRA, 756 GZSTATE_EXTRA2, 757 GZSTATE_EXTRA3, 758 GZSTATE_ORIGNAME, 759 GZSTATE_COMMENT, 760 GZSTATE_HEAD_CRC1, 761 GZSTATE_HEAD_CRC2, 762 GZSTATE_INIT, 763 GZSTATE_READ, 764 GZSTATE_CRC, 765 GZSTATE_LEN, 766 } state = GZSTATE_MAGIC0; 767 int flags = 0, skip_count = 0; 768 int error = Z_STREAM_ERROR, done_reading = 0; 769 uLong crc = 0; 770 ssize_t wr; 771 int needmore = 0; 772 773 #define ADVANCE() { z.next_in++; z.avail_in--; } 774 775 if ((outbufp = malloc(BUFLEN)) == NULL) { 776 maybe_err("malloc failed"); 777 goto out2; 778 } 779 if ((inbufp = malloc(BUFLEN)) == NULL) { 780 maybe_err("malloc failed"); 781 goto out1; 782 } 783 784 memset(&z, 0, sizeof z); 785 z.avail_in = prelen; 786 z.next_in = (unsigned char *)pre; 787 z.avail_out = BUFLEN; 788 z.next_out = (unsigned char *)outbufp; 789 z.zalloc = NULL; 790 z.zfree = NULL; 791 z.opaque = 0; 792 793 in_tot = prelen; 794 out_tot = 0; 795 796 for (;;) { 797 check_siginfo(); 798 if ((z.avail_in == 0 || needmore) && done_reading == 0) { 799 ssize_t in_size; 800 801 if (z.avail_in > 0) { 802 memmove(inbufp, z.next_in, z.avail_in); 803 } 804 z.next_in = (unsigned char *)inbufp; 805 in_size = read(in, z.next_in + z.avail_in, 806 BUFLEN - z.avail_in); 807 808 if (in_size == -1) { 809 maybe_warn("failed to read stdin"); 810 goto stop_and_fail; 811 } else if (in_size == 0) { 812 done_reading = 1; 813 } 814 infile_newdata(in_size); 815 816 z.avail_in += in_size; 817 needmore = 0; 818 819 in_tot += in_size; 820 } 821 if (z.avail_in == 0) { 822 if (done_reading && state != GZSTATE_MAGIC0) { 823 maybe_warnx("%s: unexpected end of file", 824 filename); 825 goto stop_and_fail; 826 } 827 goto stop; 828 } 829 switch (state) { 830 case GZSTATE_MAGIC0: 831 if (*z.next_in != GZIP_MAGIC0) { 832 if (in_tot > 0) { 833 maybe_warnx("%s: trailing garbage " 834 "ignored", filename); 835 exit_value = 2; 836 goto stop; 837 } 838 maybe_warnx("input not gziped (MAGIC0)"); 839 goto stop_and_fail; 840 } 841 ADVANCE(); 842 state++; 843 out_sub_tot = 0; 844 crc = crc32(0L, Z_NULL, 0); 845 break; 846 847 case GZSTATE_MAGIC1: 848 if (*z.next_in != GZIP_MAGIC1 && 849 *z.next_in != GZIP_OMAGIC1) { 850 maybe_warnx("input not gziped (MAGIC1)"); 851 goto stop_and_fail; 852 } 853 ADVANCE(); 854 state++; 855 break; 856 857 case GZSTATE_METHOD: 858 if (*z.next_in != Z_DEFLATED) { 859 maybe_warnx("unknown compression method"); 860 goto stop_and_fail; 861 } 862 ADVANCE(); 863 state++; 864 break; 865 866 case GZSTATE_FLAGS: 867 flags = *z.next_in; 868 ADVANCE(); 869 skip_count = 6; 870 state++; 871 break; 872 873 case GZSTATE_SKIPPING: 874 if (skip_count > 0) { 875 skip_count--; 876 ADVANCE(); 877 } else 878 state++; 879 break; 880 881 case GZSTATE_EXTRA: 882 if ((flags & EXTRA_FIELD) == 0) { 883 state = GZSTATE_ORIGNAME; 884 break; 885 } 886 skip_count = *z.next_in; 887 ADVANCE(); 888 state++; 889 break; 890 891 case GZSTATE_EXTRA2: 892 skip_count |= ((*z.next_in) << 8); 893 ADVANCE(); 894 state++; 895 break; 896 897 case GZSTATE_EXTRA3: 898 if (skip_count > 0) { 899 skip_count--; 900 ADVANCE(); 901 } else 902 state++; 903 break; 904 905 case GZSTATE_ORIGNAME: 906 if ((flags & ORIG_NAME) == 0) { 907 state++; 908 break; 909 } 910 if (*z.next_in == 0) 911 state++; 912 ADVANCE(); 913 break; 914 915 case GZSTATE_COMMENT: 916 if ((flags & COMMENT) == 0) { 917 state++; 918 break; 919 } 920 if (*z.next_in == 0) 921 state++; 922 ADVANCE(); 923 break; 924 925 case GZSTATE_HEAD_CRC1: 926 if (flags & HEAD_CRC) 927 skip_count = 2; 928 else 929 skip_count = 0; 930 state++; 931 break; 932 933 case GZSTATE_HEAD_CRC2: 934 if (skip_count > 0) { 935 skip_count--; 936 ADVANCE(); 937 } else 938 state++; 939 break; 940 941 case GZSTATE_INIT: 942 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) { 943 maybe_warnx("failed to inflateInit"); 944 goto stop_and_fail; 945 } 946 state++; 947 break; 948 949 case GZSTATE_READ: 950 error = inflate(&z, Z_FINISH); 951 switch (error) { 952 /* Z_BUF_ERROR goes with Z_FINISH... */ 953 case Z_BUF_ERROR: 954 if (z.avail_out > 0 && !done_reading) 955 continue; 956 957 case Z_STREAM_END: 958 case Z_OK: 959 break; 960 961 case Z_NEED_DICT: 962 maybe_warnx("Z_NEED_DICT error"); 963 goto stop_and_fail; 964 case Z_DATA_ERROR: 965 maybe_warnx("data stream error"); 966 goto stop_and_fail; 967 case Z_STREAM_ERROR: 968 maybe_warnx("internal stream error"); 969 goto stop_and_fail; 970 case Z_MEM_ERROR: 971 maybe_warnx("memory allocation error"); 972 goto stop_and_fail; 973 974 default: 975 maybe_warn("unknown error from inflate(): %d", 976 error); 977 } 978 wr = BUFLEN - z.avail_out; 979 980 if (wr != 0) { 981 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr); 982 if ( 983 #ifndef SMALL 984 /* don't write anything with -t */ 985 tflag == 0 && 986 #endif 987 write_retry(out, outbufp, wr) != wr) { 988 maybe_warn("error writing to output"); 989 goto stop_and_fail; 990 } 991 992 out_tot += wr; 993 out_sub_tot += wr; 994 } 995 996 if (error == Z_STREAM_END) { 997 inflateEnd(&z); 998 state++; 999 } 1000 1001 z.next_out = (unsigned char *)outbufp; 1002 z.avail_out = BUFLEN; 1003 1004 break; 1005 case GZSTATE_CRC: 1006 { 1007 uLong origcrc; 1008 1009 if (z.avail_in < 4) { 1010 if (!done_reading) { 1011 needmore = 1; 1012 continue; 1013 } 1014 maybe_warnx("truncated input"); 1015 goto stop_and_fail; 1016 } 1017 origcrc = ((unsigned)z.next_in[0] & 0xff) | 1018 ((unsigned)z.next_in[1] & 0xff) << 8 | 1019 ((unsigned)z.next_in[2] & 0xff) << 16 | 1020 ((unsigned)z.next_in[3] & 0xff) << 24; 1021 if (origcrc != crc) { 1022 maybe_warnx("invalid compressed" 1023 " data--crc error"); 1024 goto stop_and_fail; 1025 } 1026 } 1027 1028 z.avail_in -= 4; 1029 z.next_in += 4; 1030 1031 if (!z.avail_in && done_reading) { 1032 goto stop; 1033 } 1034 state++; 1035 break; 1036 case GZSTATE_LEN: 1037 { 1038 uLong origlen; 1039 1040 if (z.avail_in < 4) { 1041 if (!done_reading) { 1042 needmore = 1; 1043 continue; 1044 } 1045 maybe_warnx("truncated input"); 1046 goto stop_and_fail; 1047 } 1048 origlen = ((unsigned)z.next_in[0] & 0xff) | 1049 ((unsigned)z.next_in[1] & 0xff) << 8 | 1050 ((unsigned)z.next_in[2] & 0xff) << 16 | 1051 ((unsigned)z.next_in[3] & 0xff) << 24; 1052 1053 if (origlen != out_sub_tot) { 1054 maybe_warnx("invalid compressed" 1055 " data--length error"); 1056 goto stop_and_fail; 1057 } 1058 } 1059 1060 z.avail_in -= 4; 1061 z.next_in += 4; 1062 1063 if (error < 0) { 1064 maybe_warnx("decompression error"); 1065 goto stop_and_fail; 1066 } 1067 state = GZSTATE_MAGIC0; 1068 break; 1069 } 1070 continue; 1071 stop_and_fail: 1072 out_tot = -1; 1073 stop: 1074 break; 1075 } 1076 if (state > GZSTATE_INIT) 1077 inflateEnd(&z); 1078 1079 free(inbufp); 1080 out1: 1081 free(outbufp); 1082 out2: 1083 if (gsizep) 1084 *gsizep = in_tot; 1085 return (out_tot); 1086 } 1087 1088 #ifndef SMALL 1089 /* 1090 * set the owner, mode, flags & utimes using the given file descriptor. 1091 * file is only used in possible warning messages. 1092 */ 1093 static void 1094 copymodes(int fd, const struct stat *sbp, const char *file) 1095 { 1096 struct timespec times[2]; 1097 struct stat sb; 1098 1099 /* 1100 * If we have no info on the input, give this file some 1101 * default values and return.. 1102 */ 1103 if (sbp == NULL) { 1104 mode_t mask = umask(022); 1105 1106 (void)fchmod(fd, DEFFILEMODE & ~mask); 1107 (void)umask(mask); 1108 return; 1109 } 1110 sb = *sbp; 1111 1112 /* if the chown fails, remove set-id bits as-per compress(1) */ 1113 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) { 1114 if (errno != EPERM) 1115 maybe_warn("couldn't fchown: %s", file); 1116 sb.st_mode &= ~(S_ISUID|S_ISGID); 1117 } 1118 1119 /* we only allow set-id and the 9 normal permission bits */ 1120 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 1121 if (fchmod(fd, sb.st_mode) < 0) 1122 maybe_warn("couldn't fchmod: %s", file); 1123 1124 times[0] = sb.st_atim; 1125 times[1] = sb.st_mtim; 1126 if (futimens(fd, times) < 0) 1127 maybe_warn("couldn't futimens: %s", file); 1128 1129 /* only try flags if they exist already */ 1130 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0) 1131 maybe_warn("couldn't fchflags: %s", file); 1132 } 1133 #endif 1134 1135 /* what sort of file is this? */ 1136 static enum filetype 1137 file_gettype(u_char *buf) 1138 { 1139 1140 if (buf[0] == GZIP_MAGIC0 && 1141 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1)) 1142 return FT_GZIP; 1143 else 1144 #ifndef NO_BZIP2_SUPPORT 1145 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 && 1146 buf[3] >= '0' && buf[3] <= '9') 1147 return FT_BZIP2; 1148 else 1149 #endif 1150 #ifndef NO_COMPRESS_SUPPORT 1151 if (memcmp(buf, Z_MAGIC, 2) == 0) 1152 return FT_Z; 1153 else 1154 #endif 1155 #ifndef NO_PACK_SUPPORT 1156 if (memcmp(buf, PACK_MAGIC, 2) == 0) 1157 return FT_PACK; 1158 else 1159 #endif 1160 #ifndef NO_XZ_SUPPORT 1161 if (memcmp(buf, XZ_MAGIC, 4) == 0) /* XXX: We only have 4 bytes */ 1162 return FT_XZ; 1163 else 1164 #endif 1165 return FT_UNKNOWN; 1166 } 1167 1168 #ifndef SMALL 1169 /* check the outfile is OK. */ 1170 static int 1171 check_outfile(const char *outfile) 1172 { 1173 struct stat sb; 1174 int ok = 1; 1175 1176 if (lflag == 0 && stat(outfile, &sb) == 0) { 1177 if (fflag) 1178 unlink(outfile); 1179 else if (isatty(STDIN_FILENO)) { 1180 char ans[10] = { 'n', '\0' }; /* default */ 1181 1182 fprintf(stderr, "%s already exists -- do you wish to " 1183 "overwrite (y or n)? " , outfile); 1184 (void)fgets(ans, sizeof(ans) - 1, stdin); 1185 if (ans[0] != 'y' && ans[0] != 'Y') { 1186 fprintf(stderr, "\tnot overwriting\n"); 1187 ok = 0; 1188 } else 1189 unlink(outfile); 1190 } else { 1191 maybe_warnx("%s already exists -- skipping", outfile); 1192 ok = 0; 1193 } 1194 } 1195 return ok; 1196 } 1197 1198 static void 1199 unlink_input(const char *file, const struct stat *sb) 1200 { 1201 struct stat nsb; 1202 1203 if (kflag) 1204 return; 1205 if (stat(file, &nsb) != 0) 1206 /* Must be gone already */ 1207 return; 1208 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino) 1209 /* Definitely a different file */ 1210 return; 1211 unlink(file); 1212 } 1213 1214 static void 1215 got_sigint(int signo __unused) 1216 { 1217 1218 if (remove_file != NULL) 1219 unlink(remove_file); 1220 _exit(2); 1221 } 1222 1223 static void 1224 got_siginfo(int signo __unused) 1225 { 1226 1227 print_info = 1; 1228 } 1229 1230 static void 1231 setup_signals(void) 1232 { 1233 1234 signal(SIGINFO, got_siginfo); 1235 signal(SIGINT, got_sigint); 1236 } 1237 1238 static void 1239 infile_newdata(size_t newdata) 1240 { 1241 1242 infile_current += newdata; 1243 } 1244 #endif 1245 1246 static void 1247 infile_set(const char *newinfile, off_t total) 1248 { 1249 1250 if (newinfile) 1251 infile = newinfile; 1252 #ifndef SMALL 1253 infile_total = total; 1254 #endif 1255 } 1256 1257 static void 1258 infile_clear(void) 1259 { 1260 1261 infile = NULL; 1262 #ifndef SMALL 1263 infile_total = infile_current = 0; 1264 #endif 1265 } 1266 1267 static const suffixes_t * 1268 check_suffix(char *file, int xlate) 1269 { 1270 const suffixes_t *s; 1271 int len = strlen(file); 1272 char *sp; 1273 1274 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) { 1275 /* if it doesn't fit in "a.suf", don't bother */ 1276 if (s->ziplen >= len) 1277 continue; 1278 sp = file + len - s->ziplen; 1279 if (strcmp(s->zipped, sp) != 0) 1280 continue; 1281 if (xlate) 1282 strcpy(sp, s->normal); 1283 return s; 1284 } 1285 return NULL; 1286 } 1287 1288 /* 1289 * compress the given file: create a corresponding .gz file and remove the 1290 * original. 1291 */ 1292 static off_t 1293 file_compress(char *file, char *outfile, size_t outsize) 1294 { 1295 int in; 1296 int out; 1297 off_t size, in_size; 1298 #ifndef SMALL 1299 struct stat isb, osb; 1300 const suffixes_t *suff; 1301 #endif 1302 1303 in = open(file, O_RDONLY); 1304 if (in == -1) { 1305 maybe_warn("can't open %s", file); 1306 return (-1); 1307 } 1308 1309 #ifndef SMALL 1310 if (fstat(in, &isb) != 0) { 1311 maybe_warn("couldn't stat: %s", file); 1312 close(in); 1313 return (-1); 1314 } 1315 #endif 1316 1317 #ifndef SMALL 1318 if (fstat(in, &isb) != 0) { 1319 close(in); 1320 maybe_warn("can't stat %s", file); 1321 return -1; 1322 } 1323 infile_set(file, isb.st_size); 1324 #endif 1325 1326 if (cflag == 0) { 1327 #ifndef SMALL 1328 if (isb.st_nlink > 1 && fflag == 0) { 1329 maybe_warnx("%s has %ju other link%s -- " 1330 "skipping", file, 1331 (uintmax_t)isb.st_nlink - 1, 1332 isb.st_nlink == 1 ? "" : "s"); 1333 close(in); 1334 return -1; 1335 } 1336 1337 if (fflag == 0 && (suff = check_suffix(file, 0)) && 1338 suff->zipped[0] != 0) { 1339 maybe_warnx("%s already has %s suffix -- unchanged", 1340 file, suff->zipped); 1341 close(in); 1342 return (-1); 1343 } 1344 #endif 1345 1346 /* Add (usually) .gz to filename */ 1347 if ((size_t)snprintf(outfile, outsize, "%s%s", 1348 file, suffixes[0].zipped) >= outsize) 1349 memcpy(outfile + outsize - suffixes[0].ziplen - 1, 1350 suffixes[0].zipped, suffixes[0].ziplen + 1); 1351 1352 #ifndef SMALL 1353 if (check_outfile(outfile) == 0) { 1354 close(in); 1355 return (-1); 1356 } 1357 #endif 1358 } 1359 1360 if (cflag == 0) { 1361 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600); 1362 if (out == -1) { 1363 maybe_warn("could not create output: %s", outfile); 1364 fclose(stdin); 1365 return (-1); 1366 } 1367 #ifndef SMALL 1368 remove_file = outfile; 1369 #endif 1370 } else 1371 out = STDOUT_FILENO; 1372 1373 in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime); 1374 1375 (void)close(in); 1376 1377 /* 1378 * If there was an error, in_size will be -1. 1379 * If we compressed to stdout, just return the size. 1380 * Otherwise stat the file and check it is the correct size. 1381 * We only blow away the file if we can stat the output and it 1382 * has the expected size. 1383 */ 1384 if (cflag != 0) 1385 return in_size == -1 ? -1 : size; 1386 1387 #ifndef SMALL 1388 if (fstat(out, &osb) != 0) { 1389 maybe_warn("couldn't stat: %s", outfile); 1390 goto bad_outfile; 1391 } 1392 1393 if (osb.st_size != size) { 1394 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting", 1395 outfile, (uintmax_t)osb.st_size, (uintmax_t)size); 1396 goto bad_outfile; 1397 } 1398 1399 copymodes(out, &isb, outfile); 1400 remove_file = NULL; 1401 #endif 1402 if (close(out) == -1) 1403 maybe_warn("couldn't close output"); 1404 1405 /* output is good, ok to delete input */ 1406 unlink_input(file, &isb); 1407 return (size); 1408 1409 #ifndef SMALL 1410 bad_outfile: 1411 if (close(out) == -1) 1412 maybe_warn("couldn't close output"); 1413 1414 maybe_warnx("leaving original %s", file); 1415 unlink(outfile); 1416 return (size); 1417 #endif 1418 } 1419 1420 /* uncompress the given file and remove the original */ 1421 static off_t 1422 file_uncompress(char *file, char *outfile, size_t outsize) 1423 { 1424 struct stat isb, osb; 1425 off_t size; 1426 ssize_t rbytes; 1427 unsigned char header1[4]; 1428 enum filetype method; 1429 int fd, ofd, zfd = -1; 1430 size_t in_size; 1431 #ifndef SMALL 1432 ssize_t rv; 1433 time_t timestamp = 0; 1434 char name[PATH_MAX + 1]; 1435 #endif 1436 1437 /* gather the old name info */ 1438 1439 fd = open(file, O_RDONLY); 1440 if (fd < 0) { 1441 maybe_warn("can't open %s", file); 1442 goto lose; 1443 } 1444 if (fstat(fd, &isb) != 0) { 1445 close(fd); 1446 maybe_warn("can't stat %s", file); 1447 goto lose; 1448 } 1449 if (S_ISREG(isb.st_mode)) 1450 in_size = isb.st_size; 1451 else 1452 in_size = 0; 1453 infile_set(file, in_size); 1454 1455 strlcpy(outfile, file, outsize); 1456 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1457 maybe_warnx("%s: unknown suffix -- ignored", file); 1458 goto lose; 1459 } 1460 1461 rbytes = read(fd, header1, sizeof header1); 1462 if (rbytes != sizeof header1) { 1463 /* we don't want to fail here. */ 1464 #ifndef SMALL 1465 if (fflag) 1466 goto lose; 1467 #endif 1468 if (rbytes == -1) 1469 maybe_warn("can't read %s", file); 1470 else 1471 goto unexpected_EOF; 1472 goto lose; 1473 } 1474 infile_newdata(rbytes); 1475 1476 method = file_gettype(header1); 1477 #ifndef SMALL 1478 if (fflag == 0 && method == FT_UNKNOWN) { 1479 maybe_warnx("%s: not in gzip format", file); 1480 goto lose; 1481 } 1482 1483 #endif 1484 1485 #ifndef SMALL 1486 if (method == FT_GZIP && Nflag) { 1487 unsigned char ts[4]; /* timestamp */ 1488 1489 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1490 if (rv >= 0 && rv < (ssize_t)(sizeof ts)) 1491 goto unexpected_EOF; 1492 if (rv == -1) { 1493 if (!fflag) 1494 maybe_warn("can't read %s", file); 1495 goto lose; 1496 } 1497 infile_newdata(rv); 1498 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0]; 1499 1500 if (header1[3] & ORIG_NAME) { 1501 rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME); 1502 if (rbytes < 0) { 1503 maybe_warn("can't read %s", file); 1504 goto lose; 1505 } 1506 if (name[0] != '\0') { 1507 char *dp, *nf; 1508 1509 /* Make sure that name is NUL-terminated */ 1510 name[rbytes] = '\0'; 1511 1512 /* strip saved directory name */ 1513 nf = strrchr(name, '/'); 1514 if (nf == NULL) 1515 nf = name; 1516 else 1517 nf++; 1518 1519 /* preserve original directory name */ 1520 dp = strrchr(file, '/'); 1521 if (dp == NULL) 1522 dp = file; 1523 else 1524 dp++; 1525 snprintf(outfile, outsize, "%.*s%.*s", 1526 (int) (dp - file), 1527 file, (int) rbytes, nf); 1528 } 1529 } 1530 } 1531 #endif 1532 lseek(fd, 0, SEEK_SET); 1533 1534 if (cflag == 0 || lflag) { 1535 #ifndef SMALL 1536 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1537 maybe_warnx("%s has %ju other links -- skipping", 1538 file, (uintmax_t)isb.st_nlink - 1); 1539 goto lose; 1540 } 1541 if (nflag == 0 && timestamp) 1542 isb.st_mtime = timestamp; 1543 if (check_outfile(outfile) == 0) 1544 goto lose; 1545 #endif 1546 } 1547 1548 if (cflag) 1549 zfd = STDOUT_FILENO; 1550 else if (lflag) 1551 zfd = -1; 1552 else { 1553 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1554 if (zfd == STDOUT_FILENO) { 1555 /* We won't close STDOUT_FILENO later... */ 1556 zfd = dup(zfd); 1557 close(STDOUT_FILENO); 1558 } 1559 if (zfd == -1) { 1560 maybe_warn("can't open %s", outfile); 1561 goto lose; 1562 } 1563 remove_file = outfile; 1564 } 1565 1566 switch (method) { 1567 #ifndef NO_BZIP2_SUPPORT 1568 case FT_BZIP2: 1569 /* XXX */ 1570 if (lflag) { 1571 maybe_warnx("no -l with bzip2 files"); 1572 goto lose; 1573 } 1574 1575 size = unbzip2(fd, zfd, NULL, 0, NULL); 1576 break; 1577 #endif 1578 1579 #ifndef NO_COMPRESS_SUPPORT 1580 case FT_Z: { 1581 FILE *in, *out; 1582 1583 /* XXX */ 1584 if (lflag) { 1585 maybe_warnx("no -l with Lempel-Ziv files"); 1586 goto lose; 1587 } 1588 1589 if ((in = zdopen(fd)) == NULL) { 1590 maybe_warn("zdopen for read: %s", file); 1591 goto lose; 1592 } 1593 1594 out = fdopen(dup(zfd), "w"); 1595 if (out == NULL) { 1596 maybe_warn("fdopen for write: %s", outfile); 1597 fclose(in); 1598 goto lose; 1599 } 1600 1601 size = zuncompress(in, out, NULL, 0, NULL); 1602 /* need to fclose() if ferror() is true... */ 1603 if (ferror(in) | fclose(in)) { 1604 maybe_warn("failed infile fclose"); 1605 unlink(outfile); 1606 (void)fclose(out); 1607 } 1608 if (fclose(out) != 0) { 1609 maybe_warn("failed outfile fclose"); 1610 unlink(outfile); 1611 goto lose; 1612 } 1613 break; 1614 } 1615 #endif 1616 1617 #ifndef NO_PACK_SUPPORT 1618 case FT_PACK: 1619 if (lflag) { 1620 maybe_warnx("no -l with packed files"); 1621 goto lose; 1622 } 1623 1624 size = unpack(fd, zfd, NULL, 0, NULL); 1625 break; 1626 #endif 1627 1628 #ifndef NO_XZ_SUPPORT 1629 case FT_XZ: 1630 if (lflag) { 1631 maybe_warnx("no -l with xz files"); 1632 goto lose; 1633 } 1634 1635 size = unxz(fd, zfd, NULL, 0, NULL); 1636 break; 1637 #endif 1638 1639 #ifndef SMALL 1640 case FT_UNKNOWN: 1641 if (lflag) { 1642 maybe_warnx("no -l for unknown filetypes"); 1643 goto lose; 1644 } 1645 size = cat_fd(NULL, 0, NULL, fd); 1646 break; 1647 #endif 1648 default: 1649 if (lflag) { 1650 print_list(fd, in_size, outfile, isb.st_mtime); 1651 close(fd); 1652 return -1; /* XXX */ 1653 } 1654 1655 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1656 break; 1657 } 1658 1659 if (close(fd) != 0) 1660 maybe_warn("couldn't close input"); 1661 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1662 maybe_warn("couldn't close output"); 1663 1664 if (size == -1) { 1665 if (cflag == 0) 1666 unlink(outfile); 1667 maybe_warnx("%s: uncompress failed", file); 1668 return -1; 1669 } 1670 1671 /* if testing, or we uncompressed to stdout, this is all we need */ 1672 #ifndef SMALL 1673 if (tflag) 1674 return size; 1675 #endif 1676 /* if we are uncompressing to stdin, don't remove the file. */ 1677 if (cflag) 1678 return size; 1679 1680 /* 1681 * if we create a file... 1682 */ 1683 /* 1684 * if we can't stat the file don't remove the file. 1685 */ 1686 1687 ofd = open(outfile, O_RDWR, 0); 1688 if (ofd == -1) { 1689 maybe_warn("couldn't open (leaving original): %s", 1690 outfile); 1691 return -1; 1692 } 1693 if (fstat(ofd, &osb) != 0) { 1694 maybe_warn("couldn't stat (leaving original): %s", 1695 outfile); 1696 close(ofd); 1697 return -1; 1698 } 1699 if (osb.st_size != size) { 1700 maybe_warnx("stat gave different size: %ju != %ju (leaving original)", 1701 (uintmax_t)size, (uintmax_t)osb.st_size); 1702 close(ofd); 1703 unlink(outfile); 1704 return -1; 1705 } 1706 #ifndef SMALL 1707 copymodes(ofd, &isb, outfile); 1708 remove_file = NULL; 1709 #endif 1710 close(ofd); 1711 unlink_input(file, &isb); 1712 return size; 1713 1714 unexpected_EOF: 1715 maybe_warnx("%s: unexpected end of file", file); 1716 lose: 1717 if (fd != -1) 1718 close(fd); 1719 if (zfd != -1 && zfd != STDOUT_FILENO) 1720 close(fd); 1721 return -1; 1722 } 1723 1724 #ifndef SMALL 1725 static void 1726 check_siginfo(void) 1727 { 1728 if (print_info == 0) 1729 return; 1730 if (infile) { 1731 if (infile_total) { 1732 int pcent = (int)((100.0 * infile_current) / infile_total); 1733 1734 fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n", 1735 infile, (unsigned long long)infile_current, 1736 (unsigned long long)infile_total, pcent); 1737 } else 1738 fprintf(stderr, "%s: done %llu bytes\n", 1739 infile, (unsigned long long)infile_current); 1740 } 1741 print_info = 0; 1742 } 1743 1744 static off_t 1745 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1746 { 1747 char buf[BUFLEN]; 1748 off_t in_tot; 1749 ssize_t w; 1750 1751 in_tot = count; 1752 w = write_retry(STDOUT_FILENO, prepend, count); 1753 if (w == -1 || (size_t)w != count) { 1754 maybe_warn("write to stdout"); 1755 return -1; 1756 } 1757 for (;;) { 1758 ssize_t rv; 1759 1760 rv = read(fd, buf, sizeof buf); 1761 if (rv == 0) 1762 break; 1763 if (rv < 0) { 1764 maybe_warn("read from fd %d", fd); 1765 break; 1766 } 1767 infile_newdata(rv); 1768 1769 if (write_retry(STDOUT_FILENO, buf, rv) != rv) { 1770 maybe_warn("write to stdout"); 1771 break; 1772 } 1773 in_tot += rv; 1774 } 1775 1776 if (gsizep) 1777 *gsizep = in_tot; 1778 return (in_tot); 1779 } 1780 #endif 1781 1782 static void 1783 handle_stdin(void) 1784 { 1785 struct stat isb; 1786 unsigned char header1[4]; 1787 size_t in_size; 1788 off_t usize, gsize; 1789 enum filetype method; 1790 ssize_t bytes_read; 1791 #ifndef NO_COMPRESS_SUPPORT 1792 FILE *in; 1793 #endif 1794 1795 #ifndef SMALL 1796 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1797 maybe_warnx("standard input is a terminal -- ignoring"); 1798 goto out; 1799 } 1800 #endif 1801 1802 if (fstat(STDIN_FILENO, &isb) < 0) { 1803 maybe_warn("fstat"); 1804 goto out; 1805 } 1806 if (S_ISREG(isb.st_mode)) 1807 in_size = isb.st_size; 1808 else 1809 in_size = 0; 1810 infile_set("(stdin)", in_size); 1811 1812 if (lflag) { 1813 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime); 1814 goto out; 1815 } 1816 1817 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1); 1818 if (bytes_read == -1) { 1819 maybe_warn("can't read stdin"); 1820 goto out; 1821 } else if (bytes_read != sizeof(header1)) { 1822 maybe_warnx("(stdin): unexpected end of file"); 1823 goto out; 1824 } 1825 1826 method = file_gettype(header1); 1827 switch (method) { 1828 default: 1829 #ifndef SMALL 1830 if (fflag == 0) { 1831 maybe_warnx("unknown compression format"); 1832 goto out; 1833 } 1834 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO); 1835 break; 1836 #endif 1837 case FT_GZIP: 1838 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1839 (char *)header1, sizeof header1, &gsize, "(stdin)"); 1840 break; 1841 #ifndef NO_BZIP2_SUPPORT 1842 case FT_BZIP2: 1843 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1844 (char *)header1, sizeof header1, &gsize); 1845 break; 1846 #endif 1847 #ifndef NO_COMPRESS_SUPPORT 1848 case FT_Z: 1849 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1850 maybe_warnx("zopen of stdin"); 1851 goto out; 1852 } 1853 1854 usize = zuncompress(in, stdout, (char *)header1, 1855 sizeof header1, &gsize); 1856 fclose(in); 1857 break; 1858 #endif 1859 #ifndef NO_PACK_SUPPORT 1860 case FT_PACK: 1861 usize = unpack(STDIN_FILENO, STDOUT_FILENO, 1862 (char *)header1, sizeof header1, &gsize); 1863 break; 1864 #endif 1865 #ifndef NO_XZ_SUPPORT 1866 case FT_XZ: 1867 usize = unxz(STDIN_FILENO, STDOUT_FILENO, 1868 (char *)header1, sizeof header1, &gsize); 1869 break; 1870 #endif 1871 } 1872 1873 #ifndef SMALL 1874 if (vflag && !tflag && usize != -1 && gsize != -1) 1875 print_verbage(NULL, NULL, usize, gsize); 1876 if (vflag && tflag) 1877 print_test("(stdin)", usize != -1); 1878 #else 1879 (void)&usize; 1880 #endif 1881 1882 out: 1883 infile_clear(); 1884 } 1885 1886 static void 1887 handle_stdout(void) 1888 { 1889 off_t gsize; 1890 #ifndef SMALL 1891 off_t usize; 1892 struct stat sb; 1893 time_t systime; 1894 uint32_t mtime; 1895 int ret; 1896 1897 infile_set("(stdout)", 0); 1898 1899 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1900 maybe_warnx("standard output is a terminal -- ignoring"); 1901 return; 1902 } 1903 1904 /* If stdin is a file use its mtime, otherwise use current time */ 1905 ret = fstat(STDIN_FILENO, &sb); 1906 if (ret < 0) { 1907 maybe_warn("Can't stat stdin"); 1908 return; 1909 } 1910 1911 if (S_ISREG(sb.st_mode)) { 1912 infile_set("(stdout)", sb.st_size); 1913 mtime = (uint32_t)sb.st_mtime; 1914 } else { 1915 systime = time(NULL); 1916 if (systime == -1) { 1917 maybe_warn("time"); 1918 return; 1919 } 1920 mtime = (uint32_t)systime; 1921 } 1922 1923 usize = 1924 #endif 1925 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1926 #ifndef SMALL 1927 if (vflag && !tflag && usize != -1 && gsize != -1) 1928 print_verbage(NULL, NULL, usize, gsize); 1929 #endif 1930 } 1931 1932 /* do what is asked for, for the path name */ 1933 static void 1934 handle_pathname(char *path) 1935 { 1936 char *opath = path, *s = NULL; 1937 ssize_t len; 1938 int slen; 1939 struct stat sb; 1940 1941 /* check for stdout/stdin */ 1942 if (path[0] == '-' && path[1] == '\0') { 1943 if (dflag) 1944 handle_stdin(); 1945 else 1946 handle_stdout(); 1947 return; 1948 } 1949 1950 retry: 1951 if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 && 1952 lstat(path, &sb) != 0)) { 1953 /* lets try <path>.gz if we're decompressing */ 1954 if (dflag && s == NULL && errno == ENOENT) { 1955 len = strlen(path); 1956 slen = suffixes[0].ziplen; 1957 s = malloc(len + slen + 1); 1958 if (s == NULL) 1959 maybe_err("malloc"); 1960 memcpy(s, path, len); 1961 memcpy(s + len, suffixes[0].zipped, slen + 1); 1962 path = s; 1963 goto retry; 1964 } 1965 maybe_warn("can't stat: %s", opath); 1966 goto out; 1967 } 1968 1969 if (S_ISDIR(sb.st_mode)) { 1970 #ifndef SMALL 1971 if (rflag) 1972 handle_dir(path); 1973 else 1974 #endif 1975 maybe_warnx("%s is a directory", path); 1976 goto out; 1977 } 1978 1979 if (S_ISREG(sb.st_mode)) 1980 handle_file(path, &sb); 1981 else 1982 maybe_warnx("%s is not a regular file", path); 1983 1984 out: 1985 if (s) 1986 free(s); 1987 } 1988 1989 /* compress/decompress a file */ 1990 static void 1991 handle_file(char *file, struct stat *sbp) 1992 { 1993 off_t usize, gsize; 1994 char outfile[PATH_MAX]; 1995 1996 infile_set(file, sbp->st_size); 1997 if (dflag) { 1998 usize = file_uncompress(file, outfile, sizeof(outfile)); 1999 #ifndef SMALL 2000 if (vflag && tflag) 2001 print_test(file, usize != -1); 2002 #endif 2003 if (usize == -1) 2004 return; 2005 gsize = sbp->st_size; 2006 } else { 2007 gsize = file_compress(file, outfile, sizeof(outfile)); 2008 if (gsize == -1) 2009 return; 2010 usize = sbp->st_size; 2011 } 2012 infile_clear(); 2013 2014 #ifndef SMALL 2015 if (vflag && !tflag) 2016 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 2017 #endif 2018 } 2019 2020 #ifndef SMALL 2021 /* this is used with -r to recursively descend directories */ 2022 static void 2023 handle_dir(char *dir) 2024 { 2025 char *path_argv[2]; 2026 FTS *fts; 2027 FTSENT *entry; 2028 2029 path_argv[0] = dir; 2030 path_argv[1] = 0; 2031 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL); 2032 if (fts == NULL) { 2033 warn("couldn't fts_open %s", dir); 2034 return; 2035 } 2036 2037 while ((entry = fts_read(fts))) { 2038 switch(entry->fts_info) { 2039 case FTS_D: 2040 case FTS_DP: 2041 continue; 2042 2043 case FTS_DNR: 2044 case FTS_ERR: 2045 case FTS_NS: 2046 maybe_warn("%s", entry->fts_path); 2047 continue; 2048 case FTS_F: 2049 handle_file(entry->fts_path, entry->fts_statp); 2050 } 2051 } 2052 (void)fts_close(fts); 2053 } 2054 #endif 2055 2056 /* print a ratio - size reduction as a fraction of uncompressed size */ 2057 static void 2058 print_ratio(off_t in, off_t out, FILE *where) 2059 { 2060 int percent10; /* 10 * percent */ 2061 off_t diff; 2062 char buff[8]; 2063 int len; 2064 2065 diff = in - out/2; 2066 if (in == 0 && out == 0) 2067 percent10 = 0; 2068 else if (diff < 0) 2069 /* 2070 * Output is more than double size of input! print -99.9% 2071 * Quite possibly we've failed to get the original size. 2072 */ 2073 percent10 = -999; 2074 else { 2075 /* 2076 * We only need 12 bits of result from the final division, 2077 * so reduce the values until a 32bit division will suffice. 2078 */ 2079 while (in > 0x100000) { 2080 diff >>= 1; 2081 in >>= 1; 2082 } 2083 if (in != 0) 2084 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 2085 else 2086 percent10 = 0; 2087 } 2088 2089 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 2090 /* Move the '.' to before the last digit */ 2091 buff[len - 1] = buff[len - 2]; 2092 buff[len - 2] = '.'; 2093 fprintf(where, "%5s%%", buff); 2094 } 2095 2096 #ifndef SMALL 2097 /* print compression statistics, and the new name (if there is one!) */ 2098 static void 2099 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 2100 { 2101 if (file) 2102 fprintf(stderr, "%s:%s ", file, 2103 strlen(file) < 7 ? "\t\t" : "\t"); 2104 print_ratio(usize, gsize, stderr); 2105 if (nfile) 2106 fprintf(stderr, " -- replaced with %s", nfile); 2107 fprintf(stderr, "\n"); 2108 fflush(stderr); 2109 } 2110 2111 /* print test results */ 2112 static void 2113 print_test(const char *file, int ok) 2114 { 2115 2116 if (exit_value == 0 && ok == 0) 2117 exit_value = 1; 2118 fprintf(stderr, "%s:%s %s\n", file, 2119 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 2120 fflush(stderr); 2121 } 2122 #endif 2123 2124 /* print a file's info ala --list */ 2125 /* eg: 2126 compressed uncompressed ratio uncompressed_name 2127 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 2128 */ 2129 static void 2130 print_list(int fd, off_t out, const char *outfile, time_t ts) 2131 { 2132 static int first = 1; 2133 #ifndef SMALL 2134 static off_t in_tot, out_tot; 2135 uint32_t crc = 0; 2136 #endif 2137 off_t in = 0, rv; 2138 2139 if (first) { 2140 #ifndef SMALL 2141 if (vflag) 2142 printf("method crc date time "); 2143 #endif 2144 if (qflag == 0) 2145 printf(" compressed uncompressed " 2146 "ratio uncompressed_name\n"); 2147 } 2148 first = 0; 2149 2150 /* print totals? */ 2151 #ifndef SMALL 2152 if (fd == -1) { 2153 in = in_tot; 2154 out = out_tot; 2155 } else 2156 #endif 2157 { 2158 /* read the last 4 bytes - this is the uncompressed size */ 2159 rv = lseek(fd, (off_t)(-8), SEEK_END); 2160 if (rv != -1) { 2161 unsigned char buf[8]; 2162 uint32_t usize; 2163 2164 rv = read(fd, (char *)buf, sizeof(buf)); 2165 if (rv == -1) 2166 maybe_warn("read of uncompressed size"); 2167 else if (rv != sizeof(buf)) 2168 maybe_warnx("read of uncompressed size"); 2169 2170 else { 2171 usize = buf[4] | buf[5] << 8 | 2172 buf[6] << 16 | buf[7] << 24; 2173 in = (off_t)usize; 2174 #ifndef SMALL 2175 crc = buf[0] | buf[1] << 8 | 2176 buf[2] << 16 | buf[3] << 24; 2177 #endif 2178 } 2179 } 2180 } 2181 2182 #ifndef SMALL 2183 if (vflag && fd == -1) 2184 printf(" "); 2185 else if (vflag) { 2186 char *date = ctime(&ts); 2187 2188 /* skip the day, 1/100th second, and year */ 2189 date += 4; 2190 date[12] = 0; 2191 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 2192 } 2193 in_tot += in; 2194 out_tot += out; 2195 #else 2196 (void)&ts; /* XXX */ 2197 #endif 2198 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 2199 print_ratio(in, out, stdout); 2200 printf(" %s\n", outfile); 2201 } 2202 2203 /* display the usage of NetBSD gzip */ 2204 static void 2205 usage(void) 2206 { 2207 2208 fprintf(stderr, "%s\n", gzip_version); 2209 fprintf(stderr, 2210 #ifdef SMALL 2211 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n", 2212 #else 2213 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n" 2214 " -1 --fast fastest (worst) compression\n" 2215 " -2 .. -8 set compression level\n" 2216 " -9 --best best (slowest) compression\n" 2217 " -c --stdout write to stdout, keep original files\n" 2218 " --to-stdout\n" 2219 " -d --decompress uncompress files\n" 2220 " --uncompress\n" 2221 " -f --force force overwriting & compress links\n" 2222 " -h --help display this help\n" 2223 " -k --keep don't delete input files during operation\n" 2224 " -l --list list compressed file contents\n" 2225 " -N --name save or restore original file name and time stamp\n" 2226 " -n --no-name don't save original file name or time stamp\n" 2227 " -q --quiet output no warnings\n" 2228 " -r --recursive recursively compress files in directories\n" 2229 " -S .suf use suffix .suf instead of .gz\n" 2230 " --suffix .suf\n" 2231 " -t --test test compressed file\n" 2232 " -V --version display program version\n" 2233 " -v --verbose print extra statistics\n", 2234 #endif 2235 getprogname()); 2236 exit(0); 2237 } 2238 2239 #ifndef SMALL 2240 /* display the license information of FreeBSD gzip */ 2241 static void 2242 display_license(void) 2243 { 2244 2245 fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version); 2246 fprintf(stderr, "%s\n", gzip_copyright); 2247 exit(0); 2248 } 2249 #endif 2250 2251 /* display the version of NetBSD gzip */ 2252 static void 2253 display_version(void) 2254 { 2255 2256 fprintf(stderr, "%s\n", gzip_version); 2257 exit(0); 2258 } 2259 2260 #ifndef NO_BZIP2_SUPPORT 2261 #include "unbzip2.c" 2262 #endif 2263 #ifndef NO_COMPRESS_SUPPORT 2264 #include "zuncompress.c" 2265 #endif 2266 #ifndef NO_PACK_SUPPORT 2267 #include "unpack.c" 2268 #endif 2269 #ifndef NO_XZ_SUPPORT 2270 #include "unxz.c" 2271 #endif 2272 2273 static ssize_t 2274 read_retry(int fd, void *buf, size_t sz) 2275 { 2276 char *cp = buf; 2277 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2278 2279 while (left > 0) { 2280 ssize_t ret; 2281 2282 ret = read(fd, cp, left); 2283 if (ret == -1) { 2284 return ret; 2285 } else if (ret == 0) { 2286 break; /* EOF */ 2287 } 2288 cp += ret; 2289 left -= ret; 2290 } 2291 2292 return sz - left; 2293 } 2294 2295 static ssize_t 2296 write_retry(int fd, const void *buf, size_t sz) 2297 { 2298 const char *cp = buf; 2299 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2300 2301 while (left > 0) { 2302 ssize_t ret; 2303 2304 ret = write(fd, cp, left); 2305 if (ret == -1) { 2306 return ret; 2307 } else if (ret == 0) { 2308 abort(); /* Can't happen */ 2309 } 2310 cp += ret; 2311 left -= ret; 2312 } 2313 2314 return sz - left; 2315 } 2316