1 /* $NetBSD: gzip.c,v 1.112 2017/08/23 13:04:17 christos Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017 7 * Matthew R. Green 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\ 36 2009, 2010, 2011, 2015, 2017 Matthew R. Green. All rights reserved."); 37 __FBSDID("$FreeBSD$"); 38 #endif /* not lint */ 39 40 /* 41 * gzip.c -- GPL free gzip using zlib. 42 * 43 * RFC 1950 covers the zlib format 44 * RFC 1951 covers the deflate format 45 * RFC 1952 covers the gzip format 46 * 47 * TODO: 48 * - use mmap where possible 49 * - make bzip2/compress -v/-t/-l support work as well as possible 50 */ 51 52 #include <sys/param.h> 53 #include <sys/stat.h> 54 #include <sys/time.h> 55 56 #include <inttypes.h> 57 #include <unistd.h> 58 #include <stdio.h> 59 #include <string.h> 60 #include <stdlib.h> 61 #include <err.h> 62 #include <errno.h> 63 #include <fcntl.h> 64 #include <zlib.h> 65 #include <fts.h> 66 #include <libgen.h> 67 #include <stdarg.h> 68 #include <getopt.h> 69 #include <time.h> 70 71 /* what type of file are we dealing with */ 72 enum filetype { 73 FT_GZIP, 74 #ifndef NO_BZIP2_SUPPORT 75 FT_BZIP2, 76 #endif 77 #ifndef NO_COMPRESS_SUPPORT 78 FT_Z, 79 #endif 80 #ifndef NO_PACK_SUPPORT 81 FT_PACK, 82 #endif 83 #ifndef NO_XZ_SUPPORT 84 FT_XZ, 85 #endif 86 FT_LAST, 87 FT_UNKNOWN 88 }; 89 90 #ifndef NO_BZIP2_SUPPORT 91 #include <bzlib.h> 92 93 #define BZ2_SUFFIX ".bz2" 94 #define BZIP2_MAGIC "BZh" 95 #endif 96 97 #ifndef NO_COMPRESS_SUPPORT 98 #define Z_SUFFIX ".Z" 99 #define Z_MAGIC "\037\235" 100 #endif 101 102 #ifndef NO_PACK_SUPPORT 103 #define PACK_MAGIC "\037\036" 104 #endif 105 106 #ifndef NO_XZ_SUPPORT 107 #include <lzma.h> 108 #define XZ_SUFFIX ".xz" 109 #define XZ_MAGIC "\3757zXZ" 110 #endif 111 112 #define GZ_SUFFIX ".gz" 113 114 #define BUFLEN (64 * 1024) 115 116 #define GZIP_MAGIC0 0x1F 117 #define GZIP_MAGIC1 0x8B 118 #define GZIP_OMAGIC1 0x9E 119 120 #define GZIP_TIMESTAMP (off_t)4 121 #define GZIP_ORIGNAME (off_t)10 122 123 #define HEAD_CRC 0x02 124 #define EXTRA_FIELD 0x04 125 #define ORIG_NAME 0x08 126 #define COMMENT 0x10 127 128 #define OS_CODE 3 /* Unix */ 129 130 typedef struct { 131 const char *zipped; 132 int ziplen; 133 const char *normal; /* for unzip - must not be longer than zipped */ 134 } suffixes_t; 135 static suffixes_t suffixes[] = { 136 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N} 137 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */ 138 #ifndef SMALL 139 SUFFIX(GZ_SUFFIX, ""), 140 SUFFIX(".z", ""), 141 SUFFIX("-gz", ""), 142 SUFFIX("-z", ""), 143 SUFFIX("_z", ""), 144 SUFFIX(".taz", ".tar"), 145 SUFFIX(".tgz", ".tar"), 146 #ifndef NO_BZIP2_SUPPORT 147 SUFFIX(BZ2_SUFFIX, ""), 148 SUFFIX(".tbz", ".tar"), 149 SUFFIX(".tbz2", ".tar"), 150 #endif 151 #ifndef NO_COMPRESS_SUPPORT 152 SUFFIX(Z_SUFFIX, ""), 153 #endif 154 #ifndef NO_XZ_SUPPORT 155 SUFFIX(XZ_SUFFIX, ""), 156 #endif 157 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */ 158 #endif /* SMALL */ 159 #undef SUFFIX 160 }; 161 #define NUM_SUFFIXES (nitems(suffixes)) 162 #define SUFFIX_MAXLEN 30 163 164 static const char gzip_version[] = "FreeBSD gzip 20171121"; 165 166 #ifndef SMALL 167 static const char gzip_copyright[] = \ 168 " Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n" 169 " All rights reserved.\n" 170 "\n" 171 " Redistribution and use in source and binary forms, with or without\n" 172 " modification, are permitted provided that the following conditions\n" 173 " are met:\n" 174 " 1. Redistributions of source code must retain the above copyright\n" 175 " notice, this list of conditions and the following disclaimer.\n" 176 " 2. Redistributions in binary form must reproduce the above copyright\n" 177 " notice, this list of conditions and the following disclaimer in the\n" 178 " documentation and/or other materials provided with the distribution.\n" 179 "\n" 180 " THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n" 181 " IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" 182 " OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" 183 " IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" 184 " INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n" 185 " BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n" 186 " LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n" 187 " AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n" 188 " OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n" 189 " OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n" 190 " SUCH DAMAGE."; 191 #endif 192 193 static int cflag; /* stdout mode */ 194 static int dflag; /* decompress mode */ 195 static int lflag; /* list mode */ 196 static int numflag = 6; /* gzip -1..-9 value */ 197 198 static const char *remove_file = NULL; /* file to be removed upon SIGINT */ 199 200 static int fflag; /* force mode */ 201 #ifndef SMALL 202 static int kflag; /* don't delete input files */ 203 static int nflag; /* don't save name/timestamp */ 204 static int Nflag; /* don't restore name/timestamp */ 205 static int qflag; /* quiet mode */ 206 static int rflag; /* recursive mode */ 207 static int tflag; /* test */ 208 static int vflag; /* verbose mode */ 209 static sig_atomic_t print_info = 0; 210 #else 211 #define qflag 0 212 #define tflag 0 213 #endif 214 215 static int exit_value = 0; /* exit value */ 216 217 static const char *infile; /* name of file coming in */ 218 219 static void maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2; 220 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 221 !defined(NO_XZ_SUPPORT) 222 static void maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2; 223 #endif 224 static void maybe_warn(const char *fmt, ...) __printflike(1, 2); 225 static void maybe_warnx(const char *fmt, ...) __printflike(1, 2); 226 static enum filetype file_gettype(u_char *); 227 #ifdef SMALL 228 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz) 229 #endif 230 static off_t gz_compress(int, int, off_t *, const char *, uint32_t); 231 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *); 232 static off_t file_compress(char *, char *, size_t); 233 static off_t file_uncompress(char *, char *, size_t); 234 static void handle_pathname(char *); 235 static void handle_file(char *, struct stat *); 236 static void handle_stdin(void); 237 static void handle_stdout(void); 238 static void print_ratio(off_t, off_t, FILE *); 239 static void print_list(int fd, off_t, const char *, time_t); 240 static void usage(void) __dead2; 241 static void display_version(void) __dead2; 242 #ifndef SMALL 243 static void display_license(void); 244 #endif 245 static const suffixes_t *check_suffix(char *, int); 246 static ssize_t read_retry(int, void *, size_t); 247 static ssize_t write_retry(int, const void *, size_t); 248 249 #ifdef SMALL 250 #define infile_set(f,t) infile_set(f) 251 #endif 252 static void infile_set(const char *newinfile, off_t total); 253 254 #ifdef SMALL 255 #define unlink_input(f, sb) unlink(f) 256 #define check_siginfo() /* nothing */ 257 #define setup_signals() /* nothing */ 258 #define infile_newdata(t) /* nothing */ 259 #else 260 static off_t infile_total; /* total expected to read/write */ 261 static off_t infile_current; /* current read/write */ 262 263 static void check_siginfo(void); 264 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd); 265 static void prepend_gzip(char *, int *, char ***); 266 static void handle_dir(char *); 267 static void print_verbage(const char *, const char *, off_t, off_t); 268 static void print_test(const char *, int); 269 static void copymodes(int fd, const struct stat *, const char *file); 270 static int check_outfile(const char *outfile); 271 static void setup_signals(void); 272 static void infile_newdata(size_t newdata); 273 static void infile_clear(void); 274 #endif 275 276 #ifndef NO_BZIP2_SUPPORT 277 static off_t unbzip2(int, int, char *, size_t, off_t *); 278 #endif 279 280 #ifndef NO_COMPRESS_SUPPORT 281 static FILE *zdopen(int); 282 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *); 283 #endif 284 285 #ifndef NO_PACK_SUPPORT 286 static off_t unpack(int, int, char *, size_t, off_t *); 287 #endif 288 289 #ifndef NO_XZ_SUPPORT 290 static off_t unxz(int, int, char *, size_t, off_t *); 291 #endif 292 293 #ifdef SMALL 294 #define getopt_long(a,b,c,d,e) getopt(a,b,c) 295 #else 296 static const struct option longopts[] = { 297 { "stdout", no_argument, 0, 'c' }, 298 { "to-stdout", no_argument, 0, 'c' }, 299 { "decompress", no_argument, 0, 'd' }, 300 { "uncompress", no_argument, 0, 'd' }, 301 { "force", no_argument, 0, 'f' }, 302 { "help", no_argument, 0, 'h' }, 303 { "keep", no_argument, 0, 'k' }, 304 { "list", no_argument, 0, 'l' }, 305 { "no-name", no_argument, 0, 'n' }, 306 { "name", no_argument, 0, 'N' }, 307 { "quiet", no_argument, 0, 'q' }, 308 { "recursive", no_argument, 0, 'r' }, 309 { "suffix", required_argument, 0, 'S' }, 310 { "test", no_argument, 0, 't' }, 311 { "verbose", no_argument, 0, 'v' }, 312 { "version", no_argument, 0, 'V' }, 313 { "fast", no_argument, 0, '1' }, 314 { "best", no_argument, 0, '9' }, 315 { "ascii", no_argument, 0, 'a' }, 316 { "license", no_argument, 0, 'L' }, 317 { NULL, no_argument, 0, 0 }, 318 }; 319 #endif 320 321 int 322 main(int argc, char **argv) 323 { 324 const char *progname = getprogname(); 325 #ifndef SMALL 326 char *gzip; 327 int len; 328 #endif 329 int ch; 330 331 setup_signals(); 332 333 #ifndef SMALL 334 if ((gzip = getenv("GZIP")) != NULL) 335 prepend_gzip(gzip, &argc, &argv); 336 #endif 337 338 /* 339 * XXX 340 * handle being called `gunzip', `zcat' and `gzcat' 341 */ 342 if (strcmp(progname, "gunzip") == 0) 343 dflag = 1; 344 else if (strcmp(progname, "zcat") == 0 || 345 strcmp(progname, "gzcat") == 0) 346 dflag = cflag = 1; 347 348 #ifdef SMALL 349 #define OPT_LIST "123456789cdhlV" 350 #else 351 #define OPT_LIST "123456789acdfhklLNnqrS:tVv" 352 #endif 353 354 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) { 355 switch (ch) { 356 case '1': case '2': case '3': 357 case '4': case '5': case '6': 358 case '7': case '8': case '9': 359 numflag = ch - '0'; 360 break; 361 case 'c': 362 cflag = 1; 363 break; 364 case 'd': 365 dflag = 1; 366 break; 367 case 'l': 368 lflag = 1; 369 dflag = 1; 370 break; 371 case 'V': 372 display_version(); 373 /* NOTREACHED */ 374 #ifndef SMALL 375 case 'a': 376 fprintf(stderr, "%s: option --ascii ignored on this system\n", progname); 377 break; 378 case 'f': 379 fflag = 1; 380 break; 381 case 'k': 382 kflag = 1; 383 break; 384 case 'L': 385 display_license(); 386 /* NOT REACHED */ 387 case 'N': 388 nflag = 0; 389 Nflag = 1; 390 break; 391 case 'n': 392 nflag = 1; 393 Nflag = 0; 394 break; 395 case 'q': 396 qflag = 1; 397 break; 398 case 'r': 399 rflag = 1; 400 break; 401 case 'S': 402 len = strlen(optarg); 403 if (len != 0) { 404 if (len > SUFFIX_MAXLEN) 405 errx(1, "incorrect suffix: '%s': too long", optarg); 406 suffixes[0].zipped = optarg; 407 suffixes[0].ziplen = len; 408 } else { 409 suffixes[NUM_SUFFIXES - 1].zipped = ""; 410 suffixes[NUM_SUFFIXES - 1].ziplen = 0; 411 } 412 break; 413 case 't': 414 cflag = 1; 415 tflag = 1; 416 dflag = 1; 417 break; 418 case 'v': 419 vflag = 1; 420 break; 421 #endif 422 default: 423 usage(); 424 /* NOTREACHED */ 425 } 426 } 427 argv += optind; 428 argc -= optind; 429 430 if (argc == 0) { 431 if (dflag) /* stdin mode */ 432 handle_stdin(); 433 else /* stdout mode */ 434 handle_stdout(); 435 } else { 436 do { 437 handle_pathname(argv[0]); 438 } while (*++argv); 439 } 440 #ifndef SMALL 441 if (qflag == 0 && lflag && argc > 1) 442 print_list(-1, 0, "(totals)", 0); 443 #endif 444 exit(exit_value); 445 } 446 447 /* maybe print a warning */ 448 void 449 maybe_warn(const char *fmt, ...) 450 { 451 va_list ap; 452 453 if (qflag == 0) { 454 va_start(ap, fmt); 455 vwarn(fmt, ap); 456 va_end(ap); 457 } 458 if (exit_value == 0) 459 exit_value = 1; 460 } 461 462 /* ... without an errno. */ 463 void 464 maybe_warnx(const char *fmt, ...) 465 { 466 va_list ap; 467 468 if (qflag == 0) { 469 va_start(ap, fmt); 470 vwarnx(fmt, ap); 471 va_end(ap); 472 } 473 if (exit_value == 0) 474 exit_value = 1; 475 } 476 477 /* maybe print an error */ 478 void 479 maybe_err(const char *fmt, ...) 480 { 481 va_list ap; 482 483 if (qflag == 0) { 484 va_start(ap, fmt); 485 vwarn(fmt, ap); 486 va_end(ap); 487 } 488 exit(2); 489 } 490 491 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 492 !defined(NO_XZ_SUPPORT) 493 /* ... without an errno. */ 494 void 495 maybe_errx(const char *fmt, ...) 496 { 497 va_list ap; 498 499 if (qflag == 0) { 500 va_start(ap, fmt); 501 vwarnx(fmt, ap); 502 va_end(ap); 503 } 504 exit(2); 505 } 506 #endif 507 508 #ifndef SMALL 509 /* split up $GZIP and prepend it to the argument list */ 510 static void 511 prepend_gzip(char *gzip, int *argc, char ***argv) 512 { 513 char *s, **nargv, **ac; 514 int nenvarg = 0, i; 515 516 /* scan how many arguments there are */ 517 for (s = gzip;;) { 518 while (*s == ' ' || *s == '\t') 519 s++; 520 if (*s == 0) 521 goto count_done; 522 nenvarg++; 523 while (*s != ' ' && *s != '\t') 524 if (*s++ == 0) 525 goto count_done; 526 } 527 count_done: 528 /* punt early */ 529 if (nenvarg == 0) 530 return; 531 532 *argc += nenvarg; 533 ac = *argv; 534 535 nargv = (char **)malloc((*argc + 1) * sizeof(char *)); 536 if (nargv == NULL) 537 maybe_err("malloc"); 538 539 /* stash this away */ 540 *argv = nargv; 541 542 /* copy the program name first */ 543 i = 0; 544 nargv[i++] = *(ac++); 545 546 /* take a copy of $GZIP and add it to the array */ 547 s = strdup(gzip); 548 if (s == NULL) 549 maybe_err("strdup"); 550 for (;;) { 551 /* Skip whitespaces. */ 552 while (*s == ' ' || *s == '\t') 553 s++; 554 if (*s == 0) 555 goto copy_done; 556 nargv[i++] = s; 557 /* Find the end of this argument. */ 558 while (*s != ' ' && *s != '\t') 559 if (*s++ == 0) 560 /* Argument followed by NUL. */ 561 goto copy_done; 562 /* Terminate by overwriting ' ' or '\t' with NUL. */ 563 *s++ = 0; 564 } 565 copy_done: 566 567 /* copy the original arguments and a NULL */ 568 while (*ac) 569 nargv[i++] = *(ac++); 570 nargv[i] = NULL; 571 } 572 #endif 573 574 /* compress input to output. Return bytes read, -1 on error */ 575 static off_t 576 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime) 577 { 578 z_stream z; 579 char *outbufp, *inbufp; 580 off_t in_tot = 0, out_tot = 0; 581 ssize_t in_size; 582 int i, error; 583 uLong crc; 584 #ifdef SMALL 585 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0, 586 0, 0, 0, 0, 587 0, OS_CODE }; 588 #endif 589 590 outbufp = malloc(BUFLEN); 591 inbufp = malloc(BUFLEN); 592 if (outbufp == NULL || inbufp == NULL) { 593 maybe_err("malloc failed"); 594 goto out; 595 } 596 597 memset(&z, 0, sizeof z); 598 z.zalloc = Z_NULL; 599 z.zfree = Z_NULL; 600 z.opaque = 0; 601 602 #ifdef SMALL 603 memcpy(outbufp, header, sizeof header); 604 i = sizeof header; 605 #else 606 if (nflag != 0) { 607 mtime = 0; 608 origname = ""; 609 } 610 611 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s", 612 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 613 *origname ? ORIG_NAME : 0, 614 mtime & 0xff, 615 (mtime >> 8) & 0xff, 616 (mtime >> 16) & 0xff, 617 (mtime >> 24) & 0xff, 618 numflag == 1 ? 4 : numflag == 9 ? 2 : 0, 619 OS_CODE, origname); 620 if (i >= BUFLEN) 621 /* this need PATH_MAX > BUFLEN ... */ 622 maybe_err("snprintf"); 623 if (*origname) 624 i++; 625 #endif 626 627 z.next_out = (unsigned char *)outbufp + i; 628 z.avail_out = BUFLEN - i; 629 630 error = deflateInit2(&z, numflag, Z_DEFLATED, 631 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY); 632 if (error != Z_OK) { 633 maybe_warnx("deflateInit2 failed"); 634 in_tot = -1; 635 goto out; 636 } 637 638 crc = crc32(0L, Z_NULL, 0); 639 for (;;) { 640 if (z.avail_out == 0) { 641 if (write_retry(out, outbufp, BUFLEN) != BUFLEN) { 642 maybe_warn("write"); 643 out_tot = -1; 644 goto out; 645 } 646 647 out_tot += BUFLEN; 648 z.next_out = (unsigned char *)outbufp; 649 z.avail_out = BUFLEN; 650 } 651 652 if (z.avail_in == 0) { 653 in_size = read(in, inbufp, BUFLEN); 654 if (in_size < 0) { 655 maybe_warn("read"); 656 in_tot = -1; 657 goto out; 658 } 659 if (in_size == 0) 660 break; 661 infile_newdata(in_size); 662 663 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size); 664 in_tot += in_size; 665 z.next_in = (unsigned char *)inbufp; 666 z.avail_in = in_size; 667 } 668 669 error = deflate(&z, Z_NO_FLUSH); 670 if (error != Z_OK && error != Z_STREAM_END) { 671 maybe_warnx("deflate failed"); 672 in_tot = -1; 673 goto out; 674 } 675 } 676 677 /* clean up */ 678 for (;;) { 679 size_t len; 680 ssize_t w; 681 682 error = deflate(&z, Z_FINISH); 683 if (error != Z_OK && error != Z_STREAM_END) { 684 maybe_warnx("deflate failed"); 685 in_tot = -1; 686 goto out; 687 } 688 689 len = (char *)z.next_out - outbufp; 690 691 w = write_retry(out, outbufp, len); 692 if (w == -1 || (size_t)w != len) { 693 maybe_warn("write"); 694 out_tot = -1; 695 goto out; 696 } 697 out_tot += len; 698 z.next_out = (unsigned char *)outbufp; 699 z.avail_out = BUFLEN; 700 701 if (error == Z_STREAM_END) 702 break; 703 } 704 705 if (deflateEnd(&z) != Z_OK) { 706 maybe_warnx("deflateEnd failed"); 707 in_tot = -1; 708 goto out; 709 } 710 711 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c", 712 (int)crc & 0xff, 713 (int)(crc >> 8) & 0xff, 714 (int)(crc >> 16) & 0xff, 715 (int)(crc >> 24) & 0xff, 716 (int)in_tot & 0xff, 717 (int)(in_tot >> 8) & 0xff, 718 (int)(in_tot >> 16) & 0xff, 719 (int)(in_tot >> 24) & 0xff); 720 if (i != 8) 721 maybe_err("snprintf"); 722 if (write_retry(out, outbufp, i) != i) { 723 maybe_warn("write"); 724 in_tot = -1; 725 } else 726 out_tot += i; 727 728 out: 729 if (inbufp != NULL) 730 free(inbufp); 731 if (outbufp != NULL) 732 free(outbufp); 733 if (gsizep) 734 *gsizep = out_tot; 735 return in_tot; 736 } 737 738 /* 739 * uncompress input to output then close the input. return the 740 * uncompressed size written, and put the compressed sized read 741 * into `*gsizep'. 742 */ 743 static off_t 744 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep, 745 const char *filename) 746 { 747 z_stream z; 748 char *outbufp, *inbufp; 749 off_t out_tot = -1, in_tot = 0; 750 uint32_t out_sub_tot = 0; 751 enum { 752 GZSTATE_MAGIC0, 753 GZSTATE_MAGIC1, 754 GZSTATE_METHOD, 755 GZSTATE_FLAGS, 756 GZSTATE_SKIPPING, 757 GZSTATE_EXTRA, 758 GZSTATE_EXTRA2, 759 GZSTATE_EXTRA3, 760 GZSTATE_ORIGNAME, 761 GZSTATE_COMMENT, 762 GZSTATE_HEAD_CRC1, 763 GZSTATE_HEAD_CRC2, 764 GZSTATE_INIT, 765 GZSTATE_READ, 766 GZSTATE_CRC, 767 GZSTATE_LEN, 768 } state = GZSTATE_MAGIC0; 769 int flags = 0, skip_count = 0; 770 int error = Z_STREAM_ERROR, done_reading = 0; 771 uLong crc = 0; 772 ssize_t wr; 773 int needmore = 0; 774 775 #define ADVANCE() { z.next_in++; z.avail_in--; } 776 777 if ((outbufp = malloc(BUFLEN)) == NULL) { 778 maybe_err("malloc failed"); 779 goto out2; 780 } 781 if ((inbufp = malloc(BUFLEN)) == NULL) { 782 maybe_err("malloc failed"); 783 goto out1; 784 } 785 786 memset(&z, 0, sizeof z); 787 z.avail_in = prelen; 788 z.next_in = (unsigned char *)pre; 789 z.avail_out = BUFLEN; 790 z.next_out = (unsigned char *)outbufp; 791 z.zalloc = NULL; 792 z.zfree = NULL; 793 z.opaque = 0; 794 795 in_tot = prelen; 796 out_tot = 0; 797 798 for (;;) { 799 check_siginfo(); 800 if ((z.avail_in == 0 || needmore) && done_reading == 0) { 801 ssize_t in_size; 802 803 if (z.avail_in > 0) { 804 memmove(inbufp, z.next_in, z.avail_in); 805 } 806 z.next_in = (unsigned char *)inbufp; 807 in_size = read(in, z.next_in + z.avail_in, 808 BUFLEN - z.avail_in); 809 810 if (in_size == -1) { 811 maybe_warn("failed to read stdin"); 812 goto stop_and_fail; 813 } else if (in_size == 0) { 814 done_reading = 1; 815 } 816 infile_newdata(in_size); 817 818 z.avail_in += in_size; 819 needmore = 0; 820 821 in_tot += in_size; 822 } 823 if (z.avail_in == 0) { 824 if (done_reading && state != GZSTATE_MAGIC0) { 825 maybe_warnx("%s: unexpected end of file", 826 filename); 827 goto stop_and_fail; 828 } 829 goto stop; 830 } 831 switch (state) { 832 case GZSTATE_MAGIC0: 833 if (*z.next_in != GZIP_MAGIC0) { 834 if (in_tot > 0) { 835 maybe_warnx("%s: trailing garbage " 836 "ignored", filename); 837 exit_value = 2; 838 goto stop; 839 } 840 maybe_warnx("input not gziped (MAGIC0)"); 841 goto stop_and_fail; 842 } 843 ADVANCE(); 844 state++; 845 out_sub_tot = 0; 846 crc = crc32(0L, Z_NULL, 0); 847 break; 848 849 case GZSTATE_MAGIC1: 850 if (*z.next_in != GZIP_MAGIC1 && 851 *z.next_in != GZIP_OMAGIC1) { 852 maybe_warnx("input not gziped (MAGIC1)"); 853 goto stop_and_fail; 854 } 855 ADVANCE(); 856 state++; 857 break; 858 859 case GZSTATE_METHOD: 860 if (*z.next_in != Z_DEFLATED) { 861 maybe_warnx("unknown compression method"); 862 goto stop_and_fail; 863 } 864 ADVANCE(); 865 state++; 866 break; 867 868 case GZSTATE_FLAGS: 869 flags = *z.next_in; 870 ADVANCE(); 871 skip_count = 6; 872 state++; 873 break; 874 875 case GZSTATE_SKIPPING: 876 if (skip_count > 0) { 877 skip_count--; 878 ADVANCE(); 879 } else 880 state++; 881 break; 882 883 case GZSTATE_EXTRA: 884 if ((flags & EXTRA_FIELD) == 0) { 885 state = GZSTATE_ORIGNAME; 886 break; 887 } 888 skip_count = *z.next_in; 889 ADVANCE(); 890 state++; 891 break; 892 893 case GZSTATE_EXTRA2: 894 skip_count |= ((*z.next_in) << 8); 895 ADVANCE(); 896 state++; 897 break; 898 899 case GZSTATE_EXTRA3: 900 if (skip_count > 0) { 901 skip_count--; 902 ADVANCE(); 903 } else 904 state++; 905 break; 906 907 case GZSTATE_ORIGNAME: 908 if ((flags & ORIG_NAME) == 0) { 909 state++; 910 break; 911 } 912 if (*z.next_in == 0) 913 state++; 914 ADVANCE(); 915 break; 916 917 case GZSTATE_COMMENT: 918 if ((flags & COMMENT) == 0) { 919 state++; 920 break; 921 } 922 if (*z.next_in == 0) 923 state++; 924 ADVANCE(); 925 break; 926 927 case GZSTATE_HEAD_CRC1: 928 if (flags & HEAD_CRC) 929 skip_count = 2; 930 else 931 skip_count = 0; 932 state++; 933 break; 934 935 case GZSTATE_HEAD_CRC2: 936 if (skip_count > 0) { 937 skip_count--; 938 ADVANCE(); 939 } else 940 state++; 941 break; 942 943 case GZSTATE_INIT: 944 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) { 945 maybe_warnx("failed to inflateInit"); 946 goto stop_and_fail; 947 } 948 state++; 949 break; 950 951 case GZSTATE_READ: 952 error = inflate(&z, Z_FINISH); 953 switch (error) { 954 /* Z_BUF_ERROR goes with Z_FINISH... */ 955 case Z_BUF_ERROR: 956 if (z.avail_out > 0 && !done_reading) 957 continue; 958 959 case Z_STREAM_END: 960 case Z_OK: 961 break; 962 963 case Z_NEED_DICT: 964 maybe_warnx("Z_NEED_DICT error"); 965 goto stop_and_fail; 966 case Z_DATA_ERROR: 967 maybe_warnx("data stream error"); 968 goto stop_and_fail; 969 case Z_STREAM_ERROR: 970 maybe_warnx("internal stream error"); 971 goto stop_and_fail; 972 case Z_MEM_ERROR: 973 maybe_warnx("memory allocation error"); 974 goto stop_and_fail; 975 976 default: 977 maybe_warn("unknown error from inflate(): %d", 978 error); 979 } 980 wr = BUFLEN - z.avail_out; 981 982 if (wr != 0) { 983 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr); 984 if ( 985 #ifndef SMALL 986 /* don't write anything with -t */ 987 tflag == 0 && 988 #endif 989 write_retry(out, outbufp, wr) != wr) { 990 maybe_warn("error writing to output"); 991 goto stop_and_fail; 992 } 993 994 out_tot += wr; 995 out_sub_tot += wr; 996 } 997 998 if (error == Z_STREAM_END) { 999 inflateEnd(&z); 1000 state++; 1001 } 1002 1003 z.next_out = (unsigned char *)outbufp; 1004 z.avail_out = BUFLEN; 1005 1006 break; 1007 case GZSTATE_CRC: 1008 { 1009 uLong origcrc; 1010 1011 if (z.avail_in < 4) { 1012 if (!done_reading) { 1013 needmore = 1; 1014 continue; 1015 } 1016 maybe_warnx("truncated input"); 1017 goto stop_and_fail; 1018 } 1019 origcrc = ((unsigned)z.next_in[0] & 0xff) | 1020 ((unsigned)z.next_in[1] & 0xff) << 8 | 1021 ((unsigned)z.next_in[2] & 0xff) << 16 | 1022 ((unsigned)z.next_in[3] & 0xff) << 24; 1023 if (origcrc != crc) { 1024 maybe_warnx("invalid compressed" 1025 " data--crc error"); 1026 goto stop_and_fail; 1027 } 1028 } 1029 1030 z.avail_in -= 4; 1031 z.next_in += 4; 1032 1033 if (!z.avail_in && done_reading) { 1034 goto stop; 1035 } 1036 state++; 1037 break; 1038 case GZSTATE_LEN: 1039 { 1040 uLong origlen; 1041 1042 if (z.avail_in < 4) { 1043 if (!done_reading) { 1044 needmore = 1; 1045 continue; 1046 } 1047 maybe_warnx("truncated input"); 1048 goto stop_and_fail; 1049 } 1050 origlen = ((unsigned)z.next_in[0] & 0xff) | 1051 ((unsigned)z.next_in[1] & 0xff) << 8 | 1052 ((unsigned)z.next_in[2] & 0xff) << 16 | 1053 ((unsigned)z.next_in[3] & 0xff) << 24; 1054 1055 if (origlen != out_sub_tot) { 1056 maybe_warnx("invalid compressed" 1057 " data--length error"); 1058 goto stop_and_fail; 1059 } 1060 } 1061 1062 z.avail_in -= 4; 1063 z.next_in += 4; 1064 1065 if (error < 0) { 1066 maybe_warnx("decompression error"); 1067 goto stop_and_fail; 1068 } 1069 state = GZSTATE_MAGIC0; 1070 break; 1071 } 1072 continue; 1073 stop_and_fail: 1074 out_tot = -1; 1075 stop: 1076 break; 1077 } 1078 if (state > GZSTATE_INIT) 1079 inflateEnd(&z); 1080 1081 free(inbufp); 1082 out1: 1083 free(outbufp); 1084 out2: 1085 if (gsizep) 1086 *gsizep = in_tot; 1087 return (out_tot); 1088 } 1089 1090 #ifndef SMALL 1091 /* 1092 * set the owner, mode, flags & utimes using the given file descriptor. 1093 * file is only used in possible warning messages. 1094 */ 1095 static void 1096 copymodes(int fd, const struct stat *sbp, const char *file) 1097 { 1098 struct timespec times[2]; 1099 struct stat sb; 1100 1101 /* 1102 * If we have no info on the input, give this file some 1103 * default values and return.. 1104 */ 1105 if (sbp == NULL) { 1106 mode_t mask = umask(022); 1107 1108 (void)fchmod(fd, DEFFILEMODE & ~mask); 1109 (void)umask(mask); 1110 return; 1111 } 1112 sb = *sbp; 1113 1114 /* if the chown fails, remove set-id bits as-per compress(1) */ 1115 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) { 1116 if (errno != EPERM) 1117 maybe_warn("couldn't fchown: %s", file); 1118 sb.st_mode &= ~(S_ISUID|S_ISGID); 1119 } 1120 1121 /* we only allow set-id and the 9 normal permission bits */ 1122 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 1123 if (fchmod(fd, sb.st_mode) < 0) 1124 maybe_warn("couldn't fchmod: %s", file); 1125 1126 times[0] = sb.st_atim; 1127 times[1] = sb.st_mtim; 1128 if (futimens(fd, times) < 0) 1129 maybe_warn("couldn't futimens: %s", file); 1130 1131 /* only try flags if they exist already */ 1132 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0) 1133 maybe_warn("couldn't fchflags: %s", file); 1134 } 1135 #endif 1136 1137 /* what sort of file is this? */ 1138 static enum filetype 1139 file_gettype(u_char *buf) 1140 { 1141 1142 if (buf[0] == GZIP_MAGIC0 && 1143 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1)) 1144 return FT_GZIP; 1145 else 1146 #ifndef NO_BZIP2_SUPPORT 1147 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 && 1148 buf[3] >= '0' && buf[3] <= '9') 1149 return FT_BZIP2; 1150 else 1151 #endif 1152 #ifndef NO_COMPRESS_SUPPORT 1153 if (memcmp(buf, Z_MAGIC, 2) == 0) 1154 return FT_Z; 1155 else 1156 #endif 1157 #ifndef NO_PACK_SUPPORT 1158 if (memcmp(buf, PACK_MAGIC, 2) == 0) 1159 return FT_PACK; 1160 else 1161 #endif 1162 #ifndef NO_XZ_SUPPORT 1163 if (memcmp(buf, XZ_MAGIC, 4) == 0) /* XXX: We only have 4 bytes */ 1164 return FT_XZ; 1165 else 1166 #endif 1167 return FT_UNKNOWN; 1168 } 1169 1170 #ifndef SMALL 1171 /* check the outfile is OK. */ 1172 static int 1173 check_outfile(const char *outfile) 1174 { 1175 struct stat sb; 1176 int ok = 1; 1177 1178 if (lflag == 0 && stat(outfile, &sb) == 0) { 1179 if (fflag) 1180 unlink(outfile); 1181 else if (isatty(STDIN_FILENO)) { 1182 char ans[10] = { 'n', '\0' }; /* default */ 1183 1184 fprintf(stderr, "%s already exists -- do you wish to " 1185 "overwrite (y or n)? " , outfile); 1186 (void)fgets(ans, sizeof(ans) - 1, stdin); 1187 if (ans[0] != 'y' && ans[0] != 'Y') { 1188 fprintf(stderr, "\tnot overwriting\n"); 1189 ok = 0; 1190 } else 1191 unlink(outfile); 1192 } else { 1193 maybe_warnx("%s already exists -- skipping", outfile); 1194 ok = 0; 1195 } 1196 } 1197 return ok; 1198 } 1199 1200 static void 1201 unlink_input(const char *file, const struct stat *sb) 1202 { 1203 struct stat nsb; 1204 1205 if (kflag) 1206 return; 1207 if (stat(file, &nsb) != 0) 1208 /* Must be gone already */ 1209 return; 1210 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino) 1211 /* Definitely a different file */ 1212 return; 1213 unlink(file); 1214 } 1215 1216 static void 1217 got_sigint(int signo __unused) 1218 { 1219 1220 if (remove_file != NULL) 1221 unlink(remove_file); 1222 _exit(2); 1223 } 1224 1225 static void 1226 got_siginfo(int signo __unused) 1227 { 1228 1229 print_info = 1; 1230 } 1231 1232 static void 1233 setup_signals(void) 1234 { 1235 1236 signal(SIGINFO, got_siginfo); 1237 signal(SIGINT, got_sigint); 1238 } 1239 1240 static void 1241 infile_newdata(size_t newdata) 1242 { 1243 1244 infile_current += newdata; 1245 } 1246 #endif 1247 1248 static void 1249 infile_set(const char *newinfile, off_t total) 1250 { 1251 1252 if (newinfile) 1253 infile = newinfile; 1254 #ifndef SMALL 1255 infile_total = total; 1256 #endif 1257 } 1258 1259 static void 1260 infile_clear(void) 1261 { 1262 1263 infile = NULL; 1264 #ifndef SMALL 1265 infile_total = infile_current = 0; 1266 #endif 1267 } 1268 1269 static const suffixes_t * 1270 check_suffix(char *file, int xlate) 1271 { 1272 const suffixes_t *s; 1273 int len = strlen(file); 1274 char *sp; 1275 1276 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) { 1277 /* if it doesn't fit in "a.suf", don't bother */ 1278 if (s->ziplen >= len) 1279 continue; 1280 sp = file + len - s->ziplen; 1281 if (strcmp(s->zipped, sp) != 0) 1282 continue; 1283 if (xlate) 1284 strcpy(sp, s->normal); 1285 return s; 1286 } 1287 return NULL; 1288 } 1289 1290 /* 1291 * compress the given file: create a corresponding .gz file and remove the 1292 * original. 1293 */ 1294 static off_t 1295 file_compress(char *file, char *outfile, size_t outsize) 1296 { 1297 int in; 1298 int out; 1299 off_t size, in_size; 1300 #ifndef SMALL 1301 struct stat isb, osb; 1302 const suffixes_t *suff; 1303 #endif 1304 1305 in = open(file, O_RDONLY); 1306 if (in == -1) { 1307 maybe_warn("can't open %s", file); 1308 return (-1); 1309 } 1310 1311 #ifndef SMALL 1312 if (fstat(in, &isb) != 0) { 1313 maybe_warn("couldn't stat: %s", file); 1314 close(in); 1315 return (-1); 1316 } 1317 #endif 1318 1319 #ifndef SMALL 1320 if (fstat(in, &isb) != 0) { 1321 close(in); 1322 maybe_warn("can't stat %s", file); 1323 return -1; 1324 } 1325 infile_set(file, isb.st_size); 1326 #endif 1327 1328 if (cflag == 0) { 1329 #ifndef SMALL 1330 if (isb.st_nlink > 1 && fflag == 0) { 1331 maybe_warnx("%s has %ju other link%s -- " 1332 "skipping", file, 1333 (uintmax_t)isb.st_nlink - 1, 1334 isb.st_nlink == 1 ? "" : "s"); 1335 close(in); 1336 return -1; 1337 } 1338 1339 if (fflag == 0 && (suff = check_suffix(file, 0)) && 1340 suff->zipped[0] != 0) { 1341 maybe_warnx("%s already has %s suffix -- unchanged", 1342 file, suff->zipped); 1343 close(in); 1344 return (-1); 1345 } 1346 #endif 1347 1348 /* Add (usually) .gz to filename */ 1349 if ((size_t)snprintf(outfile, outsize, "%s%s", 1350 file, suffixes[0].zipped) >= outsize) 1351 memcpy(outfile + outsize - suffixes[0].ziplen - 1, 1352 suffixes[0].zipped, suffixes[0].ziplen + 1); 1353 1354 #ifndef SMALL 1355 if (check_outfile(outfile) == 0) { 1356 close(in); 1357 return (-1); 1358 } 1359 #endif 1360 } 1361 1362 if (cflag == 0) { 1363 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600); 1364 if (out == -1) { 1365 maybe_warn("could not create output: %s", outfile); 1366 fclose(stdin); 1367 return (-1); 1368 } 1369 #ifndef SMALL 1370 remove_file = outfile; 1371 #endif 1372 } else 1373 out = STDOUT_FILENO; 1374 1375 in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime); 1376 1377 (void)close(in); 1378 1379 /* 1380 * If there was an error, in_size will be -1. 1381 * If we compressed to stdout, just return the size. 1382 * Otherwise stat the file and check it is the correct size. 1383 * We only blow away the file if we can stat the output and it 1384 * has the expected size. 1385 */ 1386 if (cflag != 0) 1387 return in_size == -1 ? -1 : size; 1388 1389 #ifndef SMALL 1390 if (fstat(out, &osb) != 0) { 1391 maybe_warn("couldn't stat: %s", outfile); 1392 goto bad_outfile; 1393 } 1394 1395 if (osb.st_size != size) { 1396 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting", 1397 outfile, (uintmax_t)osb.st_size, (uintmax_t)size); 1398 goto bad_outfile; 1399 } 1400 1401 copymodes(out, &isb, outfile); 1402 remove_file = NULL; 1403 #endif 1404 if (close(out) == -1) 1405 maybe_warn("couldn't close output"); 1406 1407 /* output is good, ok to delete input */ 1408 unlink_input(file, &isb); 1409 return (size); 1410 1411 #ifndef SMALL 1412 bad_outfile: 1413 if (close(out) == -1) 1414 maybe_warn("couldn't close output"); 1415 1416 maybe_warnx("leaving original %s", file); 1417 unlink(outfile); 1418 return (size); 1419 #endif 1420 } 1421 1422 /* uncompress the given file and remove the original */ 1423 static off_t 1424 file_uncompress(char *file, char *outfile, size_t outsize) 1425 { 1426 struct stat isb, osb; 1427 off_t size; 1428 ssize_t rbytes; 1429 unsigned char header1[4]; 1430 enum filetype method; 1431 int fd, ofd, zfd = -1; 1432 size_t in_size; 1433 #ifndef SMALL 1434 ssize_t rv; 1435 time_t timestamp = 0; 1436 char name[PATH_MAX + 1]; 1437 #endif 1438 1439 /* gather the old name info */ 1440 1441 fd = open(file, O_RDONLY); 1442 if (fd < 0) { 1443 maybe_warn("can't open %s", file); 1444 goto lose; 1445 } 1446 if (fstat(fd, &isb) != 0) { 1447 maybe_warn("can't stat %s", file); 1448 goto lose; 1449 } 1450 if (S_ISREG(isb.st_mode)) 1451 in_size = isb.st_size; 1452 else 1453 in_size = 0; 1454 infile_set(file, in_size); 1455 1456 strlcpy(outfile, file, outsize); 1457 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1458 maybe_warnx("%s: unknown suffix -- ignored", file); 1459 goto lose; 1460 } 1461 1462 rbytes = read(fd, header1, sizeof header1); 1463 if (rbytes != sizeof header1) { 1464 /* we don't want to fail here. */ 1465 #ifndef SMALL 1466 if (fflag) 1467 goto lose; 1468 #endif 1469 if (rbytes == -1) 1470 maybe_warn("can't read %s", file); 1471 else 1472 goto unexpected_EOF; 1473 goto lose; 1474 } 1475 infile_newdata(rbytes); 1476 1477 method = file_gettype(header1); 1478 #ifndef SMALL 1479 if (fflag == 0 && method == FT_UNKNOWN) { 1480 maybe_warnx("%s: not in gzip format", file); 1481 goto lose; 1482 } 1483 1484 #endif 1485 1486 #ifndef SMALL 1487 if (method == FT_GZIP && Nflag) { 1488 unsigned char ts[4]; /* timestamp */ 1489 1490 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1491 if (rv >= 0 && rv < (ssize_t)(sizeof ts)) 1492 goto unexpected_EOF; 1493 if (rv == -1) { 1494 if (!fflag) 1495 maybe_warn("can't read %s", file); 1496 goto lose; 1497 } 1498 infile_newdata(rv); 1499 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0]; 1500 1501 if (header1[3] & ORIG_NAME) { 1502 rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME); 1503 if (rbytes < 0) { 1504 maybe_warn("can't read %s", file); 1505 goto lose; 1506 } 1507 if (name[0] != '\0') { 1508 char *dp, *nf; 1509 1510 /* Make sure that name is NUL-terminated */ 1511 name[rbytes] = '\0'; 1512 1513 /* strip saved directory name */ 1514 nf = strrchr(name, '/'); 1515 if (nf == NULL) 1516 nf = name; 1517 else 1518 nf++; 1519 1520 /* preserve original directory name */ 1521 dp = strrchr(file, '/'); 1522 if (dp == NULL) 1523 dp = file; 1524 else 1525 dp++; 1526 snprintf(outfile, outsize, "%.*s%.*s", 1527 (int) (dp - file), 1528 file, (int) rbytes, nf); 1529 } 1530 } 1531 } 1532 #endif 1533 lseek(fd, 0, SEEK_SET); 1534 1535 if (cflag == 0 || lflag) { 1536 #ifndef SMALL 1537 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1538 maybe_warnx("%s has %ju other links -- skipping", 1539 file, (uintmax_t)isb.st_nlink - 1); 1540 goto lose; 1541 } 1542 if (nflag == 0 && timestamp) 1543 isb.st_mtime = timestamp; 1544 if (check_outfile(outfile) == 0) 1545 goto lose; 1546 #endif 1547 } 1548 1549 if (cflag) 1550 zfd = STDOUT_FILENO; 1551 else if (lflag) 1552 zfd = -1; 1553 else { 1554 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1555 if (zfd == STDOUT_FILENO) { 1556 /* We won't close STDOUT_FILENO later... */ 1557 zfd = dup(zfd); 1558 close(STDOUT_FILENO); 1559 } 1560 if (zfd == -1) { 1561 maybe_warn("can't open %s", outfile); 1562 goto lose; 1563 } 1564 remove_file = outfile; 1565 } 1566 1567 switch (method) { 1568 #ifndef NO_BZIP2_SUPPORT 1569 case FT_BZIP2: 1570 /* XXX */ 1571 if (lflag) { 1572 maybe_warnx("no -l with bzip2 files"); 1573 goto lose; 1574 } 1575 1576 size = unbzip2(fd, zfd, NULL, 0, NULL); 1577 break; 1578 #endif 1579 1580 #ifndef NO_COMPRESS_SUPPORT 1581 case FT_Z: { 1582 FILE *in, *out; 1583 1584 /* XXX */ 1585 if (lflag) { 1586 maybe_warnx("no -l with Lempel-Ziv files"); 1587 goto lose; 1588 } 1589 1590 if ((in = zdopen(fd)) == NULL) { 1591 maybe_warn("zdopen for read: %s", file); 1592 goto lose; 1593 } 1594 1595 out = fdopen(dup(zfd), "w"); 1596 if (out == NULL) { 1597 maybe_warn("fdopen for write: %s", outfile); 1598 fclose(in); 1599 goto lose; 1600 } 1601 1602 size = zuncompress(in, out, NULL, 0, NULL); 1603 /* need to fclose() if ferror() is true... */ 1604 if (ferror(in) | fclose(in)) { 1605 maybe_warn("failed infile fclose"); 1606 unlink(outfile); 1607 (void)fclose(out); 1608 } 1609 if (fclose(out) != 0) { 1610 maybe_warn("failed outfile fclose"); 1611 unlink(outfile); 1612 goto lose; 1613 } 1614 break; 1615 } 1616 #endif 1617 1618 #ifndef NO_PACK_SUPPORT 1619 case FT_PACK: 1620 if (lflag) { 1621 maybe_warnx("no -l with packed files"); 1622 goto lose; 1623 } 1624 1625 size = unpack(fd, zfd, NULL, 0, NULL); 1626 break; 1627 #endif 1628 1629 #ifndef NO_XZ_SUPPORT 1630 case FT_XZ: 1631 if (lflag) { 1632 maybe_warnx("no -l with xz files"); 1633 goto lose; 1634 } 1635 1636 size = unxz(fd, zfd, NULL, 0, NULL); 1637 break; 1638 #endif 1639 1640 #ifndef SMALL 1641 case FT_UNKNOWN: 1642 if (lflag) { 1643 maybe_warnx("no -l for unknown filetypes"); 1644 goto lose; 1645 } 1646 size = cat_fd(NULL, 0, NULL, fd); 1647 break; 1648 #endif 1649 default: 1650 if (lflag) { 1651 print_list(fd, in_size, outfile, isb.st_mtime); 1652 close(fd); 1653 return -1; /* XXX */ 1654 } 1655 1656 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1657 break; 1658 } 1659 1660 if (close(fd) != 0) 1661 maybe_warn("couldn't close input"); 1662 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1663 maybe_warn("couldn't close output"); 1664 1665 if (size == -1) { 1666 if (cflag == 0) 1667 unlink(outfile); 1668 maybe_warnx("%s: uncompress failed", file); 1669 return -1; 1670 } 1671 1672 /* if testing, or we uncompressed to stdout, this is all we need */ 1673 #ifndef SMALL 1674 if (tflag) 1675 return size; 1676 #endif 1677 /* if we are uncompressing to stdin, don't remove the file. */ 1678 if (cflag) 1679 return size; 1680 1681 /* 1682 * if we create a file... 1683 */ 1684 /* 1685 * if we can't stat the file don't remove the file. 1686 */ 1687 1688 ofd = open(outfile, O_RDWR, 0); 1689 if (ofd == -1) { 1690 maybe_warn("couldn't open (leaving original): %s", 1691 outfile); 1692 return -1; 1693 } 1694 if (fstat(ofd, &osb) != 0) { 1695 maybe_warn("couldn't stat (leaving original): %s", 1696 outfile); 1697 close(ofd); 1698 return -1; 1699 } 1700 if (osb.st_size != size) { 1701 maybe_warnx("stat gave different size: %ju != %ju (leaving original)", 1702 (uintmax_t)size, (uintmax_t)osb.st_size); 1703 close(ofd); 1704 unlink(outfile); 1705 return -1; 1706 } 1707 #ifndef SMALL 1708 copymodes(ofd, &isb, outfile); 1709 remove_file = NULL; 1710 #endif 1711 close(ofd); 1712 unlink_input(file, &isb); 1713 return size; 1714 1715 unexpected_EOF: 1716 maybe_warnx("%s: unexpected end of file", file); 1717 lose: 1718 if (fd != -1) 1719 close(fd); 1720 if (zfd != -1 && zfd != STDOUT_FILENO) 1721 close(zfd); 1722 return -1; 1723 } 1724 1725 #ifndef SMALL 1726 static void 1727 check_siginfo(void) 1728 { 1729 if (print_info == 0) 1730 return; 1731 if (infile) { 1732 if (infile_total) { 1733 int pcent = (int)((100.0 * infile_current) / infile_total); 1734 1735 fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n", 1736 infile, (unsigned long long)infile_current, 1737 (unsigned long long)infile_total, pcent); 1738 } else 1739 fprintf(stderr, "%s: done %llu bytes\n", 1740 infile, (unsigned long long)infile_current); 1741 } 1742 print_info = 0; 1743 } 1744 1745 static off_t 1746 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1747 { 1748 char buf[BUFLEN]; 1749 off_t in_tot; 1750 ssize_t w; 1751 1752 in_tot = count; 1753 w = write_retry(STDOUT_FILENO, prepend, count); 1754 if (w == -1 || (size_t)w != count) { 1755 maybe_warn("write to stdout"); 1756 return -1; 1757 } 1758 for (;;) { 1759 ssize_t rv; 1760 1761 rv = read(fd, buf, sizeof buf); 1762 if (rv == 0) 1763 break; 1764 if (rv < 0) { 1765 maybe_warn("read from fd %d", fd); 1766 break; 1767 } 1768 infile_newdata(rv); 1769 1770 if (write_retry(STDOUT_FILENO, buf, rv) != rv) { 1771 maybe_warn("write to stdout"); 1772 break; 1773 } 1774 in_tot += rv; 1775 } 1776 1777 if (gsizep) 1778 *gsizep = in_tot; 1779 return (in_tot); 1780 } 1781 #endif 1782 1783 static void 1784 handle_stdin(void) 1785 { 1786 struct stat isb; 1787 unsigned char header1[4]; 1788 size_t in_size; 1789 off_t usize, gsize; 1790 enum filetype method; 1791 ssize_t bytes_read; 1792 #ifndef NO_COMPRESS_SUPPORT 1793 FILE *in; 1794 #endif 1795 1796 #ifndef SMALL 1797 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1798 maybe_warnx("standard input is a terminal -- ignoring"); 1799 goto out; 1800 } 1801 #endif 1802 1803 if (fstat(STDIN_FILENO, &isb) < 0) { 1804 maybe_warn("fstat"); 1805 goto out; 1806 } 1807 if (S_ISREG(isb.st_mode)) 1808 in_size = isb.st_size; 1809 else 1810 in_size = 0; 1811 infile_set("(stdin)", in_size); 1812 1813 if (lflag) { 1814 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime); 1815 goto out; 1816 } 1817 1818 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1); 1819 if (bytes_read == -1) { 1820 maybe_warn("can't read stdin"); 1821 goto out; 1822 } else if (bytes_read != sizeof(header1)) { 1823 maybe_warnx("(stdin): unexpected end of file"); 1824 goto out; 1825 } 1826 1827 method = file_gettype(header1); 1828 switch (method) { 1829 default: 1830 #ifndef SMALL 1831 if (fflag == 0) { 1832 maybe_warnx("unknown compression format"); 1833 goto out; 1834 } 1835 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO); 1836 break; 1837 #endif 1838 case FT_GZIP: 1839 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1840 (char *)header1, sizeof header1, &gsize, "(stdin)"); 1841 break; 1842 #ifndef NO_BZIP2_SUPPORT 1843 case FT_BZIP2: 1844 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1845 (char *)header1, sizeof header1, &gsize); 1846 break; 1847 #endif 1848 #ifndef NO_COMPRESS_SUPPORT 1849 case FT_Z: 1850 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1851 maybe_warnx("zopen of stdin"); 1852 goto out; 1853 } 1854 1855 usize = zuncompress(in, stdout, (char *)header1, 1856 sizeof header1, &gsize); 1857 fclose(in); 1858 break; 1859 #endif 1860 #ifndef NO_PACK_SUPPORT 1861 case FT_PACK: 1862 usize = unpack(STDIN_FILENO, STDOUT_FILENO, 1863 (char *)header1, sizeof header1, &gsize); 1864 break; 1865 #endif 1866 #ifndef NO_XZ_SUPPORT 1867 case FT_XZ: 1868 usize = unxz(STDIN_FILENO, STDOUT_FILENO, 1869 (char *)header1, sizeof header1, &gsize); 1870 break; 1871 #endif 1872 } 1873 1874 #ifndef SMALL 1875 if (vflag && !tflag && usize != -1 && gsize != -1) 1876 print_verbage(NULL, NULL, usize, gsize); 1877 if (vflag && tflag) 1878 print_test("(stdin)", usize != -1); 1879 #else 1880 (void)&usize; 1881 #endif 1882 1883 out: 1884 infile_clear(); 1885 } 1886 1887 static void 1888 handle_stdout(void) 1889 { 1890 off_t gsize; 1891 #ifndef SMALL 1892 off_t usize; 1893 struct stat sb; 1894 time_t systime; 1895 uint32_t mtime; 1896 int ret; 1897 1898 infile_set("(stdout)", 0); 1899 1900 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1901 maybe_warnx("standard output is a terminal -- ignoring"); 1902 return; 1903 } 1904 1905 /* If stdin is a file use its mtime, otherwise use current time */ 1906 ret = fstat(STDIN_FILENO, &sb); 1907 if (ret < 0) { 1908 maybe_warn("Can't stat stdin"); 1909 return; 1910 } 1911 1912 if (S_ISREG(sb.st_mode)) { 1913 infile_set("(stdout)", sb.st_size); 1914 mtime = (uint32_t)sb.st_mtime; 1915 } else { 1916 systime = time(NULL); 1917 if (systime == -1) { 1918 maybe_warn("time"); 1919 return; 1920 } 1921 mtime = (uint32_t)systime; 1922 } 1923 1924 usize = 1925 #endif 1926 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1927 #ifndef SMALL 1928 if (vflag && !tflag && usize != -1 && gsize != -1) 1929 print_verbage(NULL, NULL, usize, gsize); 1930 #endif 1931 } 1932 1933 /* do what is asked for, for the path name */ 1934 static void 1935 handle_pathname(char *path) 1936 { 1937 char *opath = path, *s = NULL; 1938 ssize_t len; 1939 int slen; 1940 struct stat sb; 1941 1942 /* check for stdout/stdin */ 1943 if (path[0] == '-' && path[1] == '\0') { 1944 if (dflag) 1945 handle_stdin(); 1946 else 1947 handle_stdout(); 1948 return; 1949 } 1950 1951 retry: 1952 if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 && 1953 lstat(path, &sb) != 0)) { 1954 /* lets try <path>.gz if we're decompressing */ 1955 if (dflag && s == NULL && errno == ENOENT) { 1956 len = strlen(path); 1957 slen = suffixes[0].ziplen; 1958 s = malloc(len + slen + 1); 1959 if (s == NULL) 1960 maybe_err("malloc"); 1961 memcpy(s, path, len); 1962 memcpy(s + len, suffixes[0].zipped, slen + 1); 1963 path = s; 1964 goto retry; 1965 } 1966 maybe_warn("can't stat: %s", opath); 1967 goto out; 1968 } 1969 1970 if (S_ISDIR(sb.st_mode)) { 1971 #ifndef SMALL 1972 if (rflag) 1973 handle_dir(path); 1974 else 1975 #endif 1976 maybe_warnx("%s is a directory", path); 1977 goto out; 1978 } 1979 1980 if (S_ISREG(sb.st_mode)) 1981 handle_file(path, &sb); 1982 else 1983 maybe_warnx("%s is not a regular file", path); 1984 1985 out: 1986 if (s) 1987 free(s); 1988 } 1989 1990 /* compress/decompress a file */ 1991 static void 1992 handle_file(char *file, struct stat *sbp) 1993 { 1994 off_t usize, gsize; 1995 char outfile[PATH_MAX]; 1996 1997 infile_set(file, sbp->st_size); 1998 if (dflag) { 1999 usize = file_uncompress(file, outfile, sizeof(outfile)); 2000 #ifndef SMALL 2001 if (vflag && tflag) 2002 print_test(file, usize != -1); 2003 #endif 2004 if (usize == -1) 2005 return; 2006 gsize = sbp->st_size; 2007 } else { 2008 gsize = file_compress(file, outfile, sizeof(outfile)); 2009 if (gsize == -1) 2010 return; 2011 usize = sbp->st_size; 2012 } 2013 infile_clear(); 2014 2015 #ifndef SMALL 2016 if (vflag && !tflag) 2017 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 2018 #endif 2019 } 2020 2021 #ifndef SMALL 2022 /* this is used with -r to recursively descend directories */ 2023 static void 2024 handle_dir(char *dir) 2025 { 2026 char *path_argv[2]; 2027 FTS *fts; 2028 FTSENT *entry; 2029 2030 path_argv[0] = dir; 2031 path_argv[1] = 0; 2032 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL); 2033 if (fts == NULL) { 2034 warn("couldn't fts_open %s", dir); 2035 return; 2036 } 2037 2038 while ((entry = fts_read(fts))) { 2039 switch(entry->fts_info) { 2040 case FTS_D: 2041 case FTS_DP: 2042 continue; 2043 2044 case FTS_DNR: 2045 case FTS_ERR: 2046 case FTS_NS: 2047 maybe_warn("%s", entry->fts_path); 2048 continue; 2049 case FTS_F: 2050 handle_file(entry->fts_path, entry->fts_statp); 2051 } 2052 } 2053 (void)fts_close(fts); 2054 } 2055 #endif 2056 2057 /* print a ratio - size reduction as a fraction of uncompressed size */ 2058 static void 2059 print_ratio(off_t in, off_t out, FILE *where) 2060 { 2061 int percent10; /* 10 * percent */ 2062 off_t diff; 2063 char buff[8]; 2064 int len; 2065 2066 diff = in - out/2; 2067 if (in == 0 && out == 0) 2068 percent10 = 0; 2069 else if (diff < 0) 2070 /* 2071 * Output is more than double size of input! print -99.9% 2072 * Quite possibly we've failed to get the original size. 2073 */ 2074 percent10 = -999; 2075 else { 2076 /* 2077 * We only need 12 bits of result from the final division, 2078 * so reduce the values until a 32bit division will suffice. 2079 */ 2080 while (in > 0x100000) { 2081 diff >>= 1; 2082 in >>= 1; 2083 } 2084 if (in != 0) 2085 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 2086 else 2087 percent10 = 0; 2088 } 2089 2090 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 2091 /* Move the '.' to before the last digit */ 2092 buff[len - 1] = buff[len - 2]; 2093 buff[len - 2] = '.'; 2094 fprintf(where, "%5s%%", buff); 2095 } 2096 2097 #ifndef SMALL 2098 /* print compression statistics, and the new name (if there is one!) */ 2099 static void 2100 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 2101 { 2102 if (file) 2103 fprintf(stderr, "%s:%s ", file, 2104 strlen(file) < 7 ? "\t\t" : "\t"); 2105 print_ratio(usize, gsize, stderr); 2106 if (nfile) 2107 fprintf(stderr, " -- replaced with %s", nfile); 2108 fprintf(stderr, "\n"); 2109 fflush(stderr); 2110 } 2111 2112 /* print test results */ 2113 static void 2114 print_test(const char *file, int ok) 2115 { 2116 2117 if (exit_value == 0 && ok == 0) 2118 exit_value = 1; 2119 fprintf(stderr, "%s:%s %s\n", file, 2120 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 2121 fflush(stderr); 2122 } 2123 #endif 2124 2125 /* print a file's info ala --list */ 2126 /* eg: 2127 compressed uncompressed ratio uncompressed_name 2128 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 2129 */ 2130 static void 2131 print_list(int fd, off_t out, const char *outfile, time_t ts) 2132 { 2133 static int first = 1; 2134 #ifndef SMALL 2135 static off_t in_tot, out_tot; 2136 uint32_t crc = 0; 2137 #endif 2138 off_t in = 0, rv; 2139 2140 if (first) { 2141 #ifndef SMALL 2142 if (vflag) 2143 printf("method crc date time "); 2144 #endif 2145 if (qflag == 0) 2146 printf(" compressed uncompressed " 2147 "ratio uncompressed_name\n"); 2148 } 2149 first = 0; 2150 2151 /* print totals? */ 2152 #ifndef SMALL 2153 if (fd == -1) { 2154 in = in_tot; 2155 out = out_tot; 2156 } else 2157 #endif 2158 { 2159 /* read the last 4 bytes - this is the uncompressed size */ 2160 rv = lseek(fd, (off_t)(-8), SEEK_END); 2161 if (rv != -1) { 2162 unsigned char buf[8]; 2163 uint32_t usize; 2164 2165 rv = read(fd, (char *)buf, sizeof(buf)); 2166 if (rv == -1) 2167 maybe_warn("read of uncompressed size"); 2168 else if (rv != sizeof(buf)) 2169 maybe_warnx("read of uncompressed size"); 2170 2171 else { 2172 usize = buf[4] | buf[5] << 8 | 2173 buf[6] << 16 | buf[7] << 24; 2174 in = (off_t)usize; 2175 #ifndef SMALL 2176 crc = buf[0] | buf[1] << 8 | 2177 buf[2] << 16 | buf[3] << 24; 2178 #endif 2179 } 2180 } 2181 } 2182 2183 #ifndef SMALL 2184 if (vflag && fd == -1) 2185 printf(" "); 2186 else if (vflag) { 2187 char *date = ctime(&ts); 2188 2189 /* skip the day, 1/100th second, and year */ 2190 date += 4; 2191 date[12] = 0; 2192 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 2193 } 2194 in_tot += in; 2195 out_tot += out; 2196 #else 2197 (void)&ts; /* XXX */ 2198 #endif 2199 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 2200 print_ratio(in, out, stdout); 2201 printf(" %s\n", outfile); 2202 } 2203 2204 /* display the usage of NetBSD gzip */ 2205 static void 2206 usage(void) 2207 { 2208 2209 fprintf(stderr, "%s\n", gzip_version); 2210 fprintf(stderr, 2211 #ifdef SMALL 2212 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n", 2213 #else 2214 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n" 2215 " -1 --fast fastest (worst) compression\n" 2216 " -2 .. -8 set compression level\n" 2217 " -9 --best best (slowest) compression\n" 2218 " -c --stdout write to stdout, keep original files\n" 2219 " --to-stdout\n" 2220 " -d --decompress uncompress files\n" 2221 " --uncompress\n" 2222 " -f --force force overwriting & compress links\n" 2223 " -h --help display this help\n" 2224 " -k --keep don't delete input files during operation\n" 2225 " -l --list list compressed file contents\n" 2226 " -N --name save or restore original file name and time stamp\n" 2227 " -n --no-name don't save original file name or time stamp\n" 2228 " -q --quiet output no warnings\n" 2229 " -r --recursive recursively compress files in directories\n" 2230 " -S .suf use suffix .suf instead of .gz\n" 2231 " --suffix .suf\n" 2232 " -t --test test compressed file\n" 2233 " -V --version display program version\n" 2234 " -v --verbose print extra statistics\n", 2235 #endif 2236 getprogname()); 2237 exit(0); 2238 } 2239 2240 #ifndef SMALL 2241 /* display the license information of FreeBSD gzip */ 2242 static void 2243 display_license(void) 2244 { 2245 2246 fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version); 2247 fprintf(stderr, "%s\n", gzip_copyright); 2248 exit(0); 2249 } 2250 #endif 2251 2252 /* display the version of NetBSD gzip */ 2253 static void 2254 display_version(void) 2255 { 2256 2257 fprintf(stderr, "%s\n", gzip_version); 2258 exit(0); 2259 } 2260 2261 #ifndef NO_BZIP2_SUPPORT 2262 #include "unbzip2.c" 2263 #endif 2264 #ifndef NO_COMPRESS_SUPPORT 2265 #include "zuncompress.c" 2266 #endif 2267 #ifndef NO_PACK_SUPPORT 2268 #include "unpack.c" 2269 #endif 2270 #ifndef NO_XZ_SUPPORT 2271 #include "unxz.c" 2272 #endif 2273 2274 static ssize_t 2275 read_retry(int fd, void *buf, size_t sz) 2276 { 2277 char *cp = buf; 2278 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2279 2280 while (left > 0) { 2281 ssize_t ret; 2282 2283 ret = read(fd, cp, left); 2284 if (ret == -1) { 2285 return ret; 2286 } else if (ret == 0) { 2287 break; /* EOF */ 2288 } 2289 cp += ret; 2290 left -= ret; 2291 } 2292 2293 return sz - left; 2294 } 2295 2296 static ssize_t 2297 write_retry(int fd, const void *buf, size_t sz) 2298 { 2299 const char *cp = buf; 2300 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2301 2302 while (left > 0) { 2303 ssize_t ret; 2304 2305 ret = write(fd, cp, left); 2306 if (ret == -1) { 2307 return ret; 2308 } else if (ret == 0) { 2309 abort(); /* Can't happen */ 2310 } 2311 cp += ret; 2312 left -= ret; 2313 } 2314 2315 return sz - left; 2316 } 2317