1 /* $NetBSD: gzip.c,v 1.113 2018/06/12 00:42:17 kamil 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 int error; 1433 size_t in_size; 1434 #ifndef SMALL 1435 ssize_t rv; 1436 time_t timestamp = 0; 1437 char name[PATH_MAX + 1]; 1438 #endif 1439 1440 /* gather the old name info */ 1441 1442 fd = open(file, O_RDONLY); 1443 if (fd < 0) { 1444 maybe_warn("can't open %s", file); 1445 goto lose; 1446 } 1447 if (fstat(fd, &isb) != 0) { 1448 maybe_warn("can't stat %s", file); 1449 goto lose; 1450 } 1451 if (S_ISREG(isb.st_mode)) 1452 in_size = isb.st_size; 1453 else 1454 in_size = 0; 1455 infile_set(file, in_size); 1456 1457 strlcpy(outfile, file, outsize); 1458 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1459 maybe_warnx("%s: unknown suffix -- ignored", file); 1460 goto lose; 1461 } 1462 1463 rbytes = read(fd, header1, sizeof header1); 1464 if (rbytes != sizeof header1) { 1465 /* we don't want to fail here. */ 1466 #ifndef SMALL 1467 if (fflag) 1468 goto lose; 1469 #endif 1470 if (rbytes == -1) 1471 maybe_warn("can't read %s", file); 1472 else 1473 goto unexpected_EOF; 1474 goto lose; 1475 } 1476 infile_newdata(rbytes); 1477 1478 method = file_gettype(header1); 1479 #ifndef SMALL 1480 if (fflag == 0 && method == FT_UNKNOWN) { 1481 maybe_warnx("%s: not in gzip format", file); 1482 goto lose; 1483 } 1484 1485 #endif 1486 1487 #ifndef SMALL 1488 if (method == FT_GZIP && Nflag) { 1489 unsigned char ts[4]; /* timestamp */ 1490 1491 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1492 if (rv >= 0 && rv < (ssize_t)(sizeof ts)) 1493 goto unexpected_EOF; 1494 if (rv == -1) { 1495 if (!fflag) 1496 maybe_warn("can't read %s", file); 1497 goto lose; 1498 } 1499 infile_newdata(rv); 1500 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0]; 1501 1502 if (header1[3] & ORIG_NAME) { 1503 rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME); 1504 if (rbytes < 0) { 1505 maybe_warn("can't read %s", file); 1506 goto lose; 1507 } 1508 if (name[0] != '\0') { 1509 char *dp, *nf; 1510 1511 /* Make sure that name is NUL-terminated */ 1512 name[rbytes] = '\0'; 1513 1514 /* strip saved directory name */ 1515 nf = strrchr(name, '/'); 1516 if (nf == NULL) 1517 nf = name; 1518 else 1519 nf++; 1520 1521 /* preserve original directory name */ 1522 dp = strrchr(file, '/'); 1523 if (dp == NULL) 1524 dp = file; 1525 else 1526 dp++; 1527 snprintf(outfile, outsize, "%.*s%.*s", 1528 (int) (dp - file), 1529 file, (int) rbytes, nf); 1530 } 1531 } 1532 } 1533 #endif 1534 lseek(fd, 0, SEEK_SET); 1535 1536 if (cflag == 0 || lflag) { 1537 #ifndef SMALL 1538 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1539 maybe_warnx("%s has %ju other links -- skipping", 1540 file, (uintmax_t)isb.st_nlink - 1); 1541 goto lose; 1542 } 1543 if (nflag == 0 && timestamp) 1544 isb.st_mtime = timestamp; 1545 if (check_outfile(outfile) == 0) 1546 goto lose; 1547 #endif 1548 } 1549 1550 if (cflag) 1551 zfd = STDOUT_FILENO; 1552 else if (lflag) 1553 zfd = -1; 1554 else { 1555 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1556 if (zfd == STDOUT_FILENO) { 1557 /* We won't close STDOUT_FILENO later... */ 1558 zfd = dup(zfd); 1559 close(STDOUT_FILENO); 1560 } 1561 if (zfd == -1) { 1562 maybe_warn("can't open %s", outfile); 1563 goto lose; 1564 } 1565 remove_file = outfile; 1566 } 1567 1568 switch (method) { 1569 #ifndef NO_BZIP2_SUPPORT 1570 case FT_BZIP2: 1571 /* XXX */ 1572 if (lflag) { 1573 maybe_warnx("no -l with bzip2 files"); 1574 goto lose; 1575 } 1576 1577 size = unbzip2(fd, zfd, NULL, 0, NULL); 1578 break; 1579 #endif 1580 1581 #ifndef NO_COMPRESS_SUPPORT 1582 case FT_Z: { 1583 FILE *in, *out; 1584 1585 /* XXX */ 1586 if (lflag) { 1587 maybe_warnx("no -l with Lempel-Ziv files"); 1588 goto lose; 1589 } 1590 1591 if ((in = zdopen(fd)) == NULL) { 1592 maybe_warn("zdopen for read: %s", file); 1593 goto lose; 1594 } 1595 1596 out = fdopen(dup(zfd), "w"); 1597 if (out == NULL) { 1598 maybe_warn("fdopen for write: %s", outfile); 1599 fclose(in); 1600 goto lose; 1601 } 1602 1603 size = zuncompress(in, out, NULL, 0, NULL); 1604 /* need to fclose() if ferror() is true... */ 1605 error = ferror(in); 1606 if (error | fclose(in)) { 1607 if (error) 1608 maybe_warn("failed infile"); 1609 else 1610 maybe_warn("failed infile fclose"); 1611 if (cflag == 0) 1612 unlink(outfile); 1613 (void)fclose(out); 1614 goto lose; 1615 } 1616 if (fclose(out) != 0) { 1617 maybe_warn("failed outfile fclose"); 1618 if (cflag == 0) 1619 unlink(outfile); 1620 goto lose; 1621 } 1622 break; 1623 } 1624 #endif 1625 1626 #ifndef NO_PACK_SUPPORT 1627 case FT_PACK: 1628 if (lflag) { 1629 maybe_warnx("no -l with packed files"); 1630 goto lose; 1631 } 1632 1633 size = unpack(fd, zfd, NULL, 0, NULL); 1634 break; 1635 #endif 1636 1637 #ifndef NO_XZ_SUPPORT 1638 case FT_XZ: 1639 if (lflag) { 1640 maybe_warnx("no -l with xz files"); 1641 goto lose; 1642 } 1643 1644 size = unxz(fd, zfd, NULL, 0, NULL); 1645 break; 1646 #endif 1647 1648 #ifndef SMALL 1649 case FT_UNKNOWN: 1650 if (lflag) { 1651 maybe_warnx("no -l for unknown filetypes"); 1652 goto lose; 1653 } 1654 size = cat_fd(NULL, 0, NULL, fd); 1655 break; 1656 #endif 1657 default: 1658 if (lflag) { 1659 print_list(fd, in_size, outfile, isb.st_mtime); 1660 close(fd); 1661 return -1; /* XXX */ 1662 } 1663 1664 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1665 break; 1666 } 1667 1668 if (close(fd) != 0) 1669 maybe_warn("couldn't close input"); 1670 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1671 maybe_warn("couldn't close output"); 1672 1673 if (size == -1) { 1674 if (cflag == 0) 1675 unlink(outfile); 1676 maybe_warnx("%s: uncompress failed", file); 1677 return -1; 1678 } 1679 1680 /* if testing, or we uncompressed to stdout, this is all we need */ 1681 #ifndef SMALL 1682 if (tflag) 1683 return size; 1684 #endif 1685 /* if we are uncompressing to stdin, don't remove the file. */ 1686 if (cflag) 1687 return size; 1688 1689 /* 1690 * if we create a file... 1691 */ 1692 /* 1693 * if we can't stat the file don't remove the file. 1694 */ 1695 1696 ofd = open(outfile, O_RDWR, 0); 1697 if (ofd == -1) { 1698 maybe_warn("couldn't open (leaving original): %s", 1699 outfile); 1700 return -1; 1701 } 1702 if (fstat(ofd, &osb) != 0) { 1703 maybe_warn("couldn't stat (leaving original): %s", 1704 outfile); 1705 close(ofd); 1706 return -1; 1707 } 1708 if (osb.st_size != size) { 1709 maybe_warnx("stat gave different size: %ju != %ju (leaving original)", 1710 (uintmax_t)size, (uintmax_t)osb.st_size); 1711 close(ofd); 1712 unlink(outfile); 1713 return -1; 1714 } 1715 #ifndef SMALL 1716 copymodes(ofd, &isb, outfile); 1717 remove_file = NULL; 1718 #endif 1719 close(ofd); 1720 unlink_input(file, &isb); 1721 return size; 1722 1723 unexpected_EOF: 1724 maybe_warnx("%s: unexpected end of file", file); 1725 lose: 1726 if (fd != -1) 1727 close(fd); 1728 if (zfd != -1 && zfd != STDOUT_FILENO) 1729 close(zfd); 1730 return -1; 1731 } 1732 1733 #ifndef SMALL 1734 static void 1735 check_siginfo(void) 1736 { 1737 if (print_info == 0) 1738 return; 1739 if (infile) { 1740 if (infile_total) { 1741 int pcent = (int)((100.0 * infile_current) / infile_total); 1742 1743 fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n", 1744 infile, (unsigned long long)infile_current, 1745 (unsigned long long)infile_total, pcent); 1746 } else 1747 fprintf(stderr, "%s: done %llu bytes\n", 1748 infile, (unsigned long long)infile_current); 1749 } 1750 print_info = 0; 1751 } 1752 1753 static off_t 1754 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1755 { 1756 char buf[BUFLEN]; 1757 off_t in_tot; 1758 ssize_t w; 1759 1760 in_tot = count; 1761 w = write_retry(STDOUT_FILENO, prepend, count); 1762 if (w == -1 || (size_t)w != count) { 1763 maybe_warn("write to stdout"); 1764 return -1; 1765 } 1766 for (;;) { 1767 ssize_t rv; 1768 1769 rv = read(fd, buf, sizeof buf); 1770 if (rv == 0) 1771 break; 1772 if (rv < 0) { 1773 maybe_warn("read from fd %d", fd); 1774 break; 1775 } 1776 infile_newdata(rv); 1777 1778 if (write_retry(STDOUT_FILENO, buf, rv) != rv) { 1779 maybe_warn("write to stdout"); 1780 break; 1781 } 1782 in_tot += rv; 1783 } 1784 1785 if (gsizep) 1786 *gsizep = in_tot; 1787 return (in_tot); 1788 } 1789 #endif 1790 1791 static void 1792 handle_stdin(void) 1793 { 1794 struct stat isb; 1795 unsigned char header1[4]; 1796 size_t in_size; 1797 off_t usize, gsize; 1798 enum filetype method; 1799 ssize_t bytes_read; 1800 #ifndef NO_COMPRESS_SUPPORT 1801 FILE *in; 1802 #endif 1803 1804 #ifndef SMALL 1805 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1806 maybe_warnx("standard input is a terminal -- ignoring"); 1807 goto out; 1808 } 1809 #endif 1810 1811 if (fstat(STDIN_FILENO, &isb) < 0) { 1812 maybe_warn("fstat"); 1813 goto out; 1814 } 1815 if (S_ISREG(isb.st_mode)) 1816 in_size = isb.st_size; 1817 else 1818 in_size = 0; 1819 infile_set("(stdin)", in_size); 1820 1821 if (lflag) { 1822 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime); 1823 goto out; 1824 } 1825 1826 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1); 1827 if (bytes_read == -1) { 1828 maybe_warn("can't read stdin"); 1829 goto out; 1830 } else if (bytes_read != sizeof(header1)) { 1831 maybe_warnx("(stdin): unexpected end of file"); 1832 goto out; 1833 } 1834 1835 method = file_gettype(header1); 1836 switch (method) { 1837 default: 1838 #ifndef SMALL 1839 if (fflag == 0) { 1840 maybe_warnx("unknown compression format"); 1841 goto out; 1842 } 1843 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO); 1844 break; 1845 #endif 1846 case FT_GZIP: 1847 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1848 (char *)header1, sizeof header1, &gsize, "(stdin)"); 1849 break; 1850 #ifndef NO_BZIP2_SUPPORT 1851 case FT_BZIP2: 1852 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1853 (char *)header1, sizeof header1, &gsize); 1854 break; 1855 #endif 1856 #ifndef NO_COMPRESS_SUPPORT 1857 case FT_Z: 1858 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1859 maybe_warnx("zopen of stdin"); 1860 goto out; 1861 } 1862 1863 usize = zuncompress(in, stdout, (char *)header1, 1864 sizeof header1, &gsize); 1865 fclose(in); 1866 break; 1867 #endif 1868 #ifndef NO_PACK_SUPPORT 1869 case FT_PACK: 1870 usize = unpack(STDIN_FILENO, STDOUT_FILENO, 1871 (char *)header1, sizeof header1, &gsize); 1872 break; 1873 #endif 1874 #ifndef NO_XZ_SUPPORT 1875 case FT_XZ: 1876 usize = unxz(STDIN_FILENO, STDOUT_FILENO, 1877 (char *)header1, sizeof header1, &gsize); 1878 break; 1879 #endif 1880 } 1881 1882 #ifndef SMALL 1883 if (vflag && !tflag && usize != -1 && gsize != -1) 1884 print_verbage(NULL, NULL, usize, gsize); 1885 if (vflag && tflag) 1886 print_test("(stdin)", usize != -1); 1887 #else 1888 (void)&usize; 1889 #endif 1890 1891 out: 1892 infile_clear(); 1893 } 1894 1895 static void 1896 handle_stdout(void) 1897 { 1898 off_t gsize; 1899 #ifndef SMALL 1900 off_t usize; 1901 struct stat sb; 1902 time_t systime; 1903 uint32_t mtime; 1904 int ret; 1905 1906 infile_set("(stdout)", 0); 1907 1908 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1909 maybe_warnx("standard output is a terminal -- ignoring"); 1910 return; 1911 } 1912 1913 /* If stdin is a file use its mtime, otherwise use current time */ 1914 ret = fstat(STDIN_FILENO, &sb); 1915 if (ret < 0) { 1916 maybe_warn("Can't stat stdin"); 1917 return; 1918 } 1919 1920 if (S_ISREG(sb.st_mode)) { 1921 infile_set("(stdout)", sb.st_size); 1922 mtime = (uint32_t)sb.st_mtime; 1923 } else { 1924 systime = time(NULL); 1925 if (systime == -1) { 1926 maybe_warn("time"); 1927 return; 1928 } 1929 mtime = (uint32_t)systime; 1930 } 1931 1932 usize = 1933 #endif 1934 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1935 #ifndef SMALL 1936 if (vflag && !tflag && usize != -1 && gsize != -1) 1937 print_verbage(NULL, NULL, usize, gsize); 1938 #endif 1939 } 1940 1941 /* do what is asked for, for the path name */ 1942 static void 1943 handle_pathname(char *path) 1944 { 1945 char *opath = path, *s = NULL; 1946 ssize_t len; 1947 int slen; 1948 struct stat sb; 1949 1950 /* check for stdout/stdin */ 1951 if (path[0] == '-' && path[1] == '\0') { 1952 if (dflag) 1953 handle_stdin(); 1954 else 1955 handle_stdout(); 1956 return; 1957 } 1958 1959 retry: 1960 if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 && 1961 lstat(path, &sb) != 0)) { 1962 /* lets try <path>.gz if we're decompressing */ 1963 if (dflag && s == NULL && errno == ENOENT) { 1964 len = strlen(path); 1965 slen = suffixes[0].ziplen; 1966 s = malloc(len + slen + 1); 1967 if (s == NULL) 1968 maybe_err("malloc"); 1969 memcpy(s, path, len); 1970 memcpy(s + len, suffixes[0].zipped, slen + 1); 1971 path = s; 1972 goto retry; 1973 } 1974 maybe_warn("can't stat: %s", opath); 1975 goto out; 1976 } 1977 1978 if (S_ISDIR(sb.st_mode)) { 1979 #ifndef SMALL 1980 if (rflag) 1981 handle_dir(path); 1982 else 1983 #endif 1984 maybe_warnx("%s is a directory", path); 1985 goto out; 1986 } 1987 1988 if (S_ISREG(sb.st_mode)) 1989 handle_file(path, &sb); 1990 else 1991 maybe_warnx("%s is not a regular file", path); 1992 1993 out: 1994 if (s) 1995 free(s); 1996 } 1997 1998 /* compress/decompress a file */ 1999 static void 2000 handle_file(char *file, struct stat *sbp) 2001 { 2002 off_t usize, gsize; 2003 char outfile[PATH_MAX]; 2004 2005 infile_set(file, sbp->st_size); 2006 if (dflag) { 2007 usize = file_uncompress(file, outfile, sizeof(outfile)); 2008 #ifndef SMALL 2009 if (vflag && tflag) 2010 print_test(file, usize != -1); 2011 #endif 2012 if (usize == -1) 2013 return; 2014 gsize = sbp->st_size; 2015 } else { 2016 gsize = file_compress(file, outfile, sizeof(outfile)); 2017 if (gsize == -1) 2018 return; 2019 usize = sbp->st_size; 2020 } 2021 infile_clear(); 2022 2023 #ifndef SMALL 2024 if (vflag && !tflag) 2025 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 2026 #endif 2027 } 2028 2029 #ifndef SMALL 2030 /* this is used with -r to recursively descend directories */ 2031 static void 2032 handle_dir(char *dir) 2033 { 2034 char *path_argv[2]; 2035 FTS *fts; 2036 FTSENT *entry; 2037 2038 path_argv[0] = dir; 2039 path_argv[1] = 0; 2040 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL); 2041 if (fts == NULL) { 2042 warn("couldn't fts_open %s", dir); 2043 return; 2044 } 2045 2046 while ((entry = fts_read(fts))) { 2047 switch(entry->fts_info) { 2048 case FTS_D: 2049 case FTS_DP: 2050 continue; 2051 2052 case FTS_DNR: 2053 case FTS_ERR: 2054 case FTS_NS: 2055 maybe_warn("%s", entry->fts_path); 2056 continue; 2057 case FTS_F: 2058 handle_file(entry->fts_path, entry->fts_statp); 2059 } 2060 } 2061 (void)fts_close(fts); 2062 } 2063 #endif 2064 2065 /* print a ratio - size reduction as a fraction of uncompressed size */ 2066 static void 2067 print_ratio(off_t in, off_t out, FILE *where) 2068 { 2069 int percent10; /* 10 * percent */ 2070 off_t diff; 2071 char buff[8]; 2072 int len; 2073 2074 diff = in - out/2; 2075 if (in == 0 && out == 0) 2076 percent10 = 0; 2077 else if (diff < 0) 2078 /* 2079 * Output is more than double size of input! print -99.9% 2080 * Quite possibly we've failed to get the original size. 2081 */ 2082 percent10 = -999; 2083 else { 2084 /* 2085 * We only need 12 bits of result from the final division, 2086 * so reduce the values until a 32bit division will suffice. 2087 */ 2088 while (in > 0x100000) { 2089 diff >>= 1; 2090 in >>= 1; 2091 } 2092 if (in != 0) 2093 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 2094 else 2095 percent10 = 0; 2096 } 2097 2098 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 2099 /* Move the '.' to before the last digit */ 2100 buff[len - 1] = buff[len - 2]; 2101 buff[len - 2] = '.'; 2102 fprintf(where, "%5s%%", buff); 2103 } 2104 2105 #ifndef SMALL 2106 /* print compression statistics, and the new name (if there is one!) */ 2107 static void 2108 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 2109 { 2110 if (file) 2111 fprintf(stderr, "%s:%s ", file, 2112 strlen(file) < 7 ? "\t\t" : "\t"); 2113 print_ratio(usize, gsize, stderr); 2114 if (nfile) 2115 fprintf(stderr, " -- replaced with %s", nfile); 2116 fprintf(stderr, "\n"); 2117 fflush(stderr); 2118 } 2119 2120 /* print test results */ 2121 static void 2122 print_test(const char *file, int ok) 2123 { 2124 2125 if (exit_value == 0 && ok == 0) 2126 exit_value = 1; 2127 fprintf(stderr, "%s:%s %s\n", file, 2128 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 2129 fflush(stderr); 2130 } 2131 #endif 2132 2133 /* print a file's info ala --list */ 2134 /* eg: 2135 compressed uncompressed ratio uncompressed_name 2136 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 2137 */ 2138 static void 2139 print_list(int fd, off_t out, const char *outfile, time_t ts) 2140 { 2141 static int first = 1; 2142 #ifndef SMALL 2143 static off_t in_tot, out_tot; 2144 uint32_t crc = 0; 2145 #endif 2146 off_t in = 0, rv; 2147 2148 if (first) { 2149 #ifndef SMALL 2150 if (vflag) 2151 printf("method crc date time "); 2152 #endif 2153 if (qflag == 0) 2154 printf(" compressed uncompressed " 2155 "ratio uncompressed_name\n"); 2156 } 2157 first = 0; 2158 2159 /* print totals? */ 2160 #ifndef SMALL 2161 if (fd == -1) { 2162 in = in_tot; 2163 out = out_tot; 2164 } else 2165 #endif 2166 { 2167 /* read the last 4 bytes - this is the uncompressed size */ 2168 rv = lseek(fd, (off_t)(-8), SEEK_END); 2169 if (rv != -1) { 2170 unsigned char buf[8]; 2171 uint32_t usize; 2172 2173 rv = read(fd, (char *)buf, sizeof(buf)); 2174 if (rv == -1) 2175 maybe_warn("read of uncompressed size"); 2176 else if (rv != sizeof(buf)) 2177 maybe_warnx("read of uncompressed size"); 2178 2179 else { 2180 usize = buf[4]; 2181 usize |= (unsigned int)buf[5] << 8; 2182 usize |= (unsigned int)buf[6] << 16; 2183 usize |= (unsigned int)buf[7] << 24; 2184 in = (off_t)usize; 2185 #ifndef SMALL 2186 crc = buf[0]; 2187 crc |= (unsigned int)buf[1] << 8; 2188 crc |= (unsigned int)buf[2] << 16; 2189 crc |= (unsigned int)buf[3] << 24; 2190 #endif 2191 } 2192 } 2193 } 2194 2195 #ifndef SMALL 2196 if (vflag && fd == -1) 2197 printf(" "); 2198 else if (vflag) { 2199 char *date = ctime(&ts); 2200 2201 /* skip the day, 1/100th second, and year */ 2202 date += 4; 2203 date[12] = 0; 2204 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 2205 } 2206 in_tot += in; 2207 out_tot += out; 2208 #else 2209 (void)&ts; /* XXX */ 2210 #endif 2211 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 2212 print_ratio(in, out, stdout); 2213 printf(" %s\n", outfile); 2214 } 2215 2216 /* display the usage of NetBSD gzip */ 2217 static void 2218 usage(void) 2219 { 2220 2221 fprintf(stderr, "%s\n", gzip_version); 2222 fprintf(stderr, 2223 #ifdef SMALL 2224 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n", 2225 #else 2226 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n" 2227 " -1 --fast fastest (worst) compression\n" 2228 " -2 .. -8 set compression level\n" 2229 " -9 --best best (slowest) compression\n" 2230 " -c --stdout write to stdout, keep original files\n" 2231 " --to-stdout\n" 2232 " -d --decompress uncompress files\n" 2233 " --uncompress\n" 2234 " -f --force force overwriting & compress links\n" 2235 " -h --help display this help\n" 2236 " -k --keep don't delete input files during operation\n" 2237 " -l --list list compressed file contents\n" 2238 " -N --name save or restore original file name and time stamp\n" 2239 " -n --no-name don't save original file name or time stamp\n" 2240 " -q --quiet output no warnings\n" 2241 " -r --recursive recursively compress files in directories\n" 2242 " -S .suf use suffix .suf instead of .gz\n" 2243 " --suffix .suf\n" 2244 " -t --test test compressed file\n" 2245 " -V --version display program version\n" 2246 " -v --verbose print extra statistics\n", 2247 #endif 2248 getprogname()); 2249 exit(0); 2250 } 2251 2252 #ifndef SMALL 2253 /* display the license information of FreeBSD gzip */ 2254 static void 2255 display_license(void) 2256 { 2257 2258 fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version); 2259 fprintf(stderr, "%s\n", gzip_copyright); 2260 exit(0); 2261 } 2262 #endif 2263 2264 /* display the version of NetBSD gzip */ 2265 static void 2266 display_version(void) 2267 { 2268 2269 fprintf(stderr, "%s\n", gzip_version); 2270 exit(0); 2271 } 2272 2273 #ifndef NO_BZIP2_SUPPORT 2274 #include "unbzip2.c" 2275 #endif 2276 #ifndef NO_COMPRESS_SUPPORT 2277 #include "zuncompress.c" 2278 #endif 2279 #ifndef NO_PACK_SUPPORT 2280 #include "unpack.c" 2281 #endif 2282 #ifndef NO_XZ_SUPPORT 2283 #include "unxz.c" 2284 #endif 2285 2286 static ssize_t 2287 read_retry(int fd, void *buf, size_t sz) 2288 { 2289 char *cp = buf; 2290 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2291 2292 while (left > 0) { 2293 ssize_t ret; 2294 2295 ret = read(fd, cp, left); 2296 if (ret == -1) { 2297 return ret; 2298 } else if (ret == 0) { 2299 break; /* EOF */ 2300 } 2301 cp += ret; 2302 left -= ret; 2303 } 2304 2305 return sz - left; 2306 } 2307 2308 static ssize_t 2309 write_retry(int fd, const void *buf, size_t sz) 2310 { 2311 const char *cp = buf; 2312 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2313 2314 while (left > 0) { 2315 ssize_t ret; 2316 2317 ret = write(fd, cp, left); 2318 if (ret == -1) { 2319 return ret; 2320 } else if (ret == 0) { 2321 abort(); /* Can't happen */ 2322 } 2323 cp += ret; 2324 left -= ret; 2325 } 2326 2327 return sz - left; 2328 } 2329