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/endian.h> 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 57 #include <inttypes.h> 58 #include <unistd.h> 59 #include <stdio.h> 60 #include <string.h> 61 #include <stdlib.h> 62 #include <err.h> 63 #include <errno.h> 64 #include <fcntl.h> 65 #include <zlib.h> 66 #include <fts.h> 67 #include <libgen.h> 68 #include <stdarg.h> 69 #include <getopt.h> 70 #include <time.h> 71 72 /* what type of file are we dealing with */ 73 enum filetype { 74 FT_GZIP, 75 #ifndef NO_BZIP2_SUPPORT 76 FT_BZIP2, 77 #endif 78 #ifndef NO_COMPRESS_SUPPORT 79 FT_Z, 80 #endif 81 #ifndef NO_PACK_SUPPORT 82 FT_PACK, 83 #endif 84 #ifndef NO_XZ_SUPPORT 85 FT_XZ, 86 #endif 87 FT_LAST, 88 FT_UNKNOWN 89 }; 90 91 #ifndef NO_BZIP2_SUPPORT 92 #include <bzlib.h> 93 94 #define BZ2_SUFFIX ".bz2" 95 #define BZIP2_MAGIC "BZh" 96 #endif 97 98 #ifndef NO_COMPRESS_SUPPORT 99 #define Z_SUFFIX ".Z" 100 #define Z_MAGIC "\037\235" 101 #endif 102 103 #ifndef NO_PACK_SUPPORT 104 #define PACK_MAGIC "\037\036" 105 #endif 106 107 #ifndef NO_XZ_SUPPORT 108 #include <lzma.h> 109 #define XZ_SUFFIX ".xz" 110 #define XZ_MAGIC "\3757zXZ" 111 #endif 112 113 #define GZ_SUFFIX ".gz" 114 115 #define BUFLEN (64 * 1024) 116 117 #define GZIP_MAGIC0 0x1F 118 #define GZIP_MAGIC1 0x8B 119 #define GZIP_OMAGIC1 0x9E 120 121 #define GZIP_TIMESTAMP (off_t)4 122 #define GZIP_ORIGNAME (off_t)10 123 124 #define HEAD_CRC 0x02 125 #define EXTRA_FIELD 0x04 126 #define ORIG_NAME 0x08 127 #define COMMENT 0x10 128 129 #define OS_CODE 3 /* Unix */ 130 131 typedef struct { 132 const char *zipped; 133 int ziplen; 134 const char *normal; /* for unzip - must not be longer than zipped */ 135 } suffixes_t; 136 static suffixes_t suffixes[] = { 137 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N} 138 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S .xxx */ 139 #ifndef SMALL 140 SUFFIX(GZ_SUFFIX, ""), 141 SUFFIX(".z", ""), 142 SUFFIX("-gz", ""), 143 SUFFIX("-z", ""), 144 SUFFIX("_z", ""), 145 SUFFIX(".taz", ".tar"), 146 SUFFIX(".tgz", ".tar"), 147 #ifndef NO_BZIP2_SUPPORT 148 SUFFIX(BZ2_SUFFIX, ""), 149 SUFFIX(".tbz", ".tar"), 150 SUFFIX(".tbz2", ".tar"), 151 #endif 152 #ifndef NO_COMPRESS_SUPPORT 153 SUFFIX(Z_SUFFIX, ""), 154 #endif 155 #ifndef NO_XZ_SUPPORT 156 SUFFIX(XZ_SUFFIX, ""), 157 #endif 158 SUFFIX(GZ_SUFFIX, ""), /* Overwritten by -S "" */ 159 #endif /* SMALL */ 160 #undef SUFFIX 161 }; 162 #define NUM_SUFFIXES (nitems(suffixes)) 163 #define SUFFIX_MAXLEN 30 164 165 static const char gzip_version[] = "FreeBSD gzip 20171121"; 166 167 #ifndef SMALL 168 static const char gzip_copyright[] = \ 169 " Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n" 170 " All rights reserved.\n" 171 "\n" 172 " Redistribution and use in source and binary forms, with or without\n" 173 " modification, are permitted provided that the following conditions\n" 174 " are met:\n" 175 " 1. Redistributions of source code must retain the above copyright\n" 176 " notice, this list of conditions and the following disclaimer.\n" 177 " 2. Redistributions in binary form must reproduce the above copyright\n" 178 " notice, this list of conditions and the following disclaimer in the\n" 179 " documentation and/or other materials provided with the distribution.\n" 180 "\n" 181 " THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n" 182 " IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" 183 " OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" 184 " IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" 185 " INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n" 186 " BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n" 187 " LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n" 188 " AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n" 189 " OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n" 190 " OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n" 191 " SUCH DAMAGE."; 192 #endif 193 194 static int cflag; /* stdout mode */ 195 static int dflag; /* decompress mode */ 196 static int lflag; /* list mode */ 197 static int numflag = 6; /* gzip -1..-9 value */ 198 199 static const char *remove_file = NULL; /* file to be removed upon SIGINT */ 200 201 static int fflag; /* force mode */ 202 #ifndef SMALL 203 static int kflag; /* don't delete input files */ 204 static int nflag; /* don't save name/timestamp */ 205 static int Nflag; /* don't restore name/timestamp */ 206 static int qflag; /* quiet mode */ 207 static int rflag; /* recursive mode */ 208 static int tflag; /* test */ 209 static int vflag; /* verbose mode */ 210 static sig_atomic_t print_info = 0; 211 #else 212 #define qflag 0 213 #define tflag 0 214 #endif 215 216 static int exit_value = 0; /* exit value */ 217 218 static const char *infile; /* name of file coming in */ 219 220 static void maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2; 221 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 222 !defined(NO_XZ_SUPPORT) 223 static void maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2; 224 #endif 225 static void maybe_warn(const char *fmt, ...) __printflike(1, 2); 226 static void maybe_warnx(const char *fmt, ...) __printflike(1, 2); 227 static enum filetype file_gettype(u_char *); 228 #ifdef SMALL 229 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz) 230 #endif 231 static off_t gz_compress(int, int, off_t *, const char *, uint32_t); 232 static off_t gz_uncompress(int, int, char *, size_t, off_t *, const char *); 233 static off_t file_compress(char *, char *, size_t); 234 static off_t file_uncompress(char *, char *, size_t); 235 static void handle_pathname(char *); 236 static void handle_file(char *, struct stat *); 237 static void handle_stdin(void); 238 static void handle_stdout(void); 239 static void print_ratio(off_t, off_t, FILE *); 240 static void print_list(int fd, off_t, const char *, time_t); 241 static void usage(void) __dead2; 242 static void display_version(void) __dead2; 243 #ifndef SMALL 244 static void display_license(void); 245 #endif 246 static const suffixes_t *check_suffix(char *, int); 247 static ssize_t read_retry(int, void *, size_t); 248 static ssize_t write_retry(int, const void *, size_t); 249 250 #ifdef SMALL 251 #define infile_set(f,t) infile_set(f) 252 #endif 253 static void infile_set(const char *newinfile, off_t total); 254 255 #ifdef SMALL 256 #define unlink_input(f, sb) unlink(f) 257 #define check_siginfo() /* nothing */ 258 #define setup_signals() /* nothing */ 259 #define infile_newdata(t) /* nothing */ 260 #else 261 static off_t infile_total; /* total expected to read/write */ 262 static off_t infile_current; /* current read/write */ 263 264 static void check_siginfo(void); 265 static off_t cat_fd(unsigned char *, size_t, off_t *, int fd); 266 static void prepend_gzip(char *, int *, char ***); 267 static void handle_dir(char *); 268 static void print_verbage(const char *, const char *, off_t, off_t); 269 static void print_test(const char *, int); 270 static void copymodes(int fd, const struct stat *, const char *file); 271 static int check_outfile(const char *outfile); 272 static void setup_signals(void); 273 static void infile_newdata(size_t newdata); 274 static void infile_clear(void); 275 #endif 276 277 #ifndef NO_BZIP2_SUPPORT 278 static off_t unbzip2(int, int, char *, size_t, off_t *); 279 #endif 280 281 #ifndef NO_COMPRESS_SUPPORT 282 static FILE *zdopen(int); 283 static off_t zuncompress(FILE *, FILE *, char *, size_t, off_t *); 284 #endif 285 286 #ifndef NO_PACK_SUPPORT 287 static off_t unpack(int, int, char *, size_t, off_t *); 288 #endif 289 290 #ifndef NO_XZ_SUPPORT 291 static off_t unxz(int, int, char *, size_t, off_t *); 292 #endif 293 294 #ifdef SMALL 295 #define getopt_long(a,b,c,d,e) getopt(a,b,c) 296 #else 297 static const struct option longopts[] = { 298 { "stdout", no_argument, 0, 'c' }, 299 { "to-stdout", no_argument, 0, 'c' }, 300 { "decompress", no_argument, 0, 'd' }, 301 { "uncompress", no_argument, 0, 'd' }, 302 { "force", no_argument, 0, 'f' }, 303 { "help", no_argument, 0, 'h' }, 304 { "keep", no_argument, 0, 'k' }, 305 { "list", no_argument, 0, 'l' }, 306 { "no-name", no_argument, 0, 'n' }, 307 { "name", no_argument, 0, 'N' }, 308 { "quiet", no_argument, 0, 'q' }, 309 { "recursive", no_argument, 0, 'r' }, 310 { "suffix", required_argument, 0, 'S' }, 311 { "test", no_argument, 0, 't' }, 312 { "verbose", no_argument, 0, 'v' }, 313 { "version", no_argument, 0, 'V' }, 314 { "fast", no_argument, 0, '1' }, 315 { "best", no_argument, 0, '9' }, 316 { "ascii", no_argument, 0, 'a' }, 317 { "license", no_argument, 0, 'L' }, 318 { NULL, no_argument, 0, 0 }, 319 }; 320 #endif 321 322 int 323 main(int argc, char **argv) 324 { 325 const char *progname = getprogname(); 326 #ifndef SMALL 327 char *gzip; 328 int len; 329 #endif 330 int ch; 331 332 setup_signals(); 333 334 #ifndef SMALL 335 if ((gzip = getenv("GZIP")) != NULL) 336 prepend_gzip(gzip, &argc, &argv); 337 #endif 338 339 /* 340 * XXX 341 * handle being called `gunzip', `zcat' and `gzcat' 342 */ 343 if (strcmp(progname, "gunzip") == 0) 344 dflag = 1; 345 else if (strcmp(progname, "zcat") == 0 || 346 strcmp(progname, "gzcat") == 0) 347 dflag = cflag = 1; 348 349 #ifdef SMALL 350 #define OPT_LIST "123456789cdhlV" 351 #else 352 #define OPT_LIST "123456789acdfhklLNnqrS:tVv" 353 #endif 354 355 while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) { 356 switch (ch) { 357 case '1': case '2': case '3': 358 case '4': case '5': case '6': 359 case '7': case '8': case '9': 360 numflag = ch - '0'; 361 break; 362 case 'c': 363 cflag = 1; 364 break; 365 case 'd': 366 dflag = 1; 367 break; 368 case 'l': 369 lflag = 1; 370 dflag = 1; 371 break; 372 case 'V': 373 display_version(); 374 /* NOTREACHED */ 375 #ifndef SMALL 376 case 'a': 377 fprintf(stderr, "%s: option --ascii ignored on this system\n", progname); 378 break; 379 case 'f': 380 fflag = 1; 381 break; 382 case 'k': 383 kflag = 1; 384 break; 385 case 'L': 386 display_license(); 387 /* NOT REACHED */ 388 case 'N': 389 nflag = 0; 390 Nflag = 1; 391 break; 392 case 'n': 393 nflag = 1; 394 Nflag = 0; 395 break; 396 case 'q': 397 qflag = 1; 398 break; 399 case 'r': 400 rflag = 1; 401 break; 402 case 'S': 403 len = strlen(optarg); 404 if (len != 0) { 405 if (len > SUFFIX_MAXLEN) 406 errx(1, "incorrect suffix: '%s': too long", optarg); 407 suffixes[0].zipped = optarg; 408 suffixes[0].ziplen = len; 409 } else { 410 suffixes[NUM_SUFFIXES - 1].zipped = ""; 411 suffixes[NUM_SUFFIXES - 1].ziplen = 0; 412 } 413 break; 414 case 't': 415 cflag = 1; 416 tflag = 1; 417 dflag = 1; 418 break; 419 case 'v': 420 vflag = 1; 421 break; 422 #endif 423 default: 424 usage(); 425 /* NOTREACHED */ 426 } 427 } 428 argv += optind; 429 argc -= optind; 430 431 if (argc == 0) { 432 if (dflag) /* stdin mode */ 433 handle_stdin(); 434 else /* stdout mode */ 435 handle_stdout(); 436 } else { 437 do { 438 handle_pathname(argv[0]); 439 } while (*++argv); 440 } 441 #ifndef SMALL 442 if (qflag == 0 && lflag && argc > 1) 443 print_list(-1, 0, "(totals)", 0); 444 #endif 445 exit(exit_value); 446 } 447 448 /* maybe print a warning */ 449 void 450 maybe_warn(const char *fmt, ...) 451 { 452 va_list ap; 453 454 if (qflag == 0) { 455 va_start(ap, fmt); 456 vwarn(fmt, ap); 457 va_end(ap); 458 } 459 if (exit_value == 0) 460 exit_value = 1; 461 } 462 463 /* ... without an errno. */ 464 void 465 maybe_warnx(const char *fmt, ...) 466 { 467 va_list ap; 468 469 if (qflag == 0) { 470 va_start(ap, fmt); 471 vwarnx(fmt, ap); 472 va_end(ap); 473 } 474 if (exit_value == 0) 475 exit_value = 1; 476 } 477 478 /* maybe print an error */ 479 void 480 maybe_err(const char *fmt, ...) 481 { 482 va_list ap; 483 484 if (qflag == 0) { 485 va_start(ap, fmt); 486 vwarn(fmt, ap); 487 va_end(ap); 488 } 489 exit(2); 490 } 491 492 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) || \ 493 !defined(NO_XZ_SUPPORT) 494 /* ... without an errno. */ 495 void 496 maybe_errx(const char *fmt, ...) 497 { 498 va_list ap; 499 500 if (qflag == 0) { 501 va_start(ap, fmt); 502 vwarnx(fmt, ap); 503 va_end(ap); 504 } 505 exit(2); 506 } 507 #endif 508 509 #ifndef SMALL 510 /* split up $GZIP and prepend it to the argument list */ 511 static void 512 prepend_gzip(char *gzip, int *argc, char ***argv) 513 { 514 char *s, **nargv, **ac; 515 int nenvarg = 0, i; 516 517 /* scan how many arguments there are */ 518 for (s = gzip;;) { 519 while (*s == ' ' || *s == '\t') 520 s++; 521 if (*s == 0) 522 goto count_done; 523 nenvarg++; 524 while (*s != ' ' && *s != '\t') 525 if (*s++ == 0) 526 goto count_done; 527 } 528 count_done: 529 /* punt early */ 530 if (nenvarg == 0) 531 return; 532 533 *argc += nenvarg; 534 ac = *argv; 535 536 nargv = (char **)malloc((*argc + 1) * sizeof(char *)); 537 if (nargv == NULL) 538 maybe_err("malloc"); 539 540 /* stash this away */ 541 *argv = nargv; 542 543 /* copy the program name first */ 544 i = 0; 545 nargv[i++] = *(ac++); 546 547 /* take a copy of $GZIP and add it to the array */ 548 s = strdup(gzip); 549 if (s == NULL) 550 maybe_err("strdup"); 551 for (;;) { 552 /* Skip whitespaces. */ 553 while (*s == ' ' || *s == '\t') 554 s++; 555 if (*s == 0) 556 goto copy_done; 557 nargv[i++] = s; 558 /* Find the end of this argument. */ 559 while (*s != ' ' && *s != '\t') 560 if (*s++ == 0) 561 /* Argument followed by NUL. */ 562 goto copy_done; 563 /* Terminate by overwriting ' ' or '\t' with NUL. */ 564 *s++ = 0; 565 } 566 copy_done: 567 568 /* copy the original arguments and a NULL */ 569 while (*ac) 570 nargv[i++] = *(ac++); 571 nargv[i] = NULL; 572 } 573 #endif 574 575 /* compress input to output. Return bytes read, -1 on error */ 576 static off_t 577 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime) 578 { 579 z_stream z; 580 char *outbufp, *inbufp; 581 off_t in_tot = 0, out_tot = 0; 582 ssize_t in_size; 583 int i, error; 584 uLong crc; 585 #ifdef SMALL 586 static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0, 587 0, 0, 0, 0, 588 0, OS_CODE }; 589 #endif 590 591 outbufp = malloc(BUFLEN); 592 inbufp = malloc(BUFLEN); 593 if (outbufp == NULL || inbufp == NULL) { 594 maybe_err("malloc failed"); 595 goto out; 596 } 597 598 memset(&z, 0, sizeof z); 599 z.zalloc = Z_NULL; 600 z.zfree = Z_NULL; 601 z.opaque = 0; 602 603 #ifdef SMALL 604 memcpy(outbufp, header, sizeof header); 605 i = sizeof header; 606 #else 607 if (nflag != 0) { 608 mtime = 0; 609 origname = ""; 610 } 611 612 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s", 613 GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 614 *origname ? ORIG_NAME : 0, 615 mtime & 0xff, 616 (mtime >> 8) & 0xff, 617 (mtime >> 16) & 0xff, 618 (mtime >> 24) & 0xff, 619 numflag == 1 ? 4 : numflag == 9 ? 2 : 0, 620 OS_CODE, origname); 621 if (i >= BUFLEN) 622 /* this need PATH_MAX > BUFLEN ... */ 623 maybe_err("snprintf"); 624 if (*origname) 625 i++; 626 #endif 627 628 z.next_out = (unsigned char *)outbufp + i; 629 z.avail_out = BUFLEN - i; 630 631 error = deflateInit2(&z, numflag, Z_DEFLATED, 632 (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY); 633 if (error != Z_OK) { 634 maybe_warnx("deflateInit2 failed"); 635 in_tot = -1; 636 goto out; 637 } 638 639 crc = crc32(0L, Z_NULL, 0); 640 for (;;) { 641 if (z.avail_out == 0) { 642 if (write_retry(out, outbufp, BUFLEN) != BUFLEN) { 643 maybe_warn("write"); 644 out_tot = -1; 645 goto out; 646 } 647 648 out_tot += BUFLEN; 649 z.next_out = (unsigned char *)outbufp; 650 z.avail_out = BUFLEN; 651 } 652 653 if (z.avail_in == 0) { 654 in_size = read(in, inbufp, BUFLEN); 655 if (in_size < 0) { 656 maybe_warn("read"); 657 in_tot = -1; 658 goto out; 659 } 660 if (in_size == 0) 661 break; 662 infile_newdata(in_size); 663 664 crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size); 665 in_tot += in_size; 666 z.next_in = (unsigned char *)inbufp; 667 z.avail_in = in_size; 668 } 669 670 error = deflate(&z, Z_NO_FLUSH); 671 if (error != Z_OK && error != Z_STREAM_END) { 672 maybe_warnx("deflate failed"); 673 in_tot = -1; 674 goto out; 675 } 676 } 677 678 /* clean up */ 679 for (;;) { 680 size_t len; 681 ssize_t w; 682 683 error = deflate(&z, Z_FINISH); 684 if (error != Z_OK && error != Z_STREAM_END) { 685 maybe_warnx("deflate failed"); 686 in_tot = -1; 687 goto out; 688 } 689 690 len = (char *)z.next_out - outbufp; 691 692 w = write_retry(out, outbufp, len); 693 if (w == -1 || (size_t)w != len) { 694 maybe_warn("write"); 695 out_tot = -1; 696 goto out; 697 } 698 out_tot += len; 699 z.next_out = (unsigned char *)outbufp; 700 z.avail_out = BUFLEN; 701 702 if (error == Z_STREAM_END) 703 break; 704 } 705 706 if (deflateEnd(&z) != Z_OK) { 707 maybe_warnx("deflateEnd failed"); 708 in_tot = -1; 709 goto out; 710 } 711 712 i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c", 713 (int)crc & 0xff, 714 (int)(crc >> 8) & 0xff, 715 (int)(crc >> 16) & 0xff, 716 (int)(crc >> 24) & 0xff, 717 (int)in_tot & 0xff, 718 (int)(in_tot >> 8) & 0xff, 719 (int)(in_tot >> 16) & 0xff, 720 (int)(in_tot >> 24) & 0xff); 721 if (i != 8) 722 maybe_err("snprintf"); 723 if (write_retry(out, outbufp, i) != i) { 724 maybe_warn("write"); 725 in_tot = -1; 726 } else 727 out_tot += i; 728 729 out: 730 if (inbufp != NULL) 731 free(inbufp); 732 if (outbufp != NULL) 733 free(outbufp); 734 if (gsizep) 735 *gsizep = out_tot; 736 return in_tot; 737 } 738 739 /* 740 * uncompress input to output then close the input. return the 741 * uncompressed size written, and put the compressed sized read 742 * into `*gsizep'. 743 */ 744 static off_t 745 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep, 746 const char *filename) 747 { 748 z_stream z; 749 char *outbufp, *inbufp; 750 off_t out_tot = -1, in_tot = 0; 751 uint32_t out_sub_tot = 0; 752 enum { 753 GZSTATE_MAGIC0, 754 GZSTATE_MAGIC1, 755 GZSTATE_METHOD, 756 GZSTATE_FLAGS, 757 GZSTATE_SKIPPING, 758 GZSTATE_EXTRA, 759 GZSTATE_EXTRA2, 760 GZSTATE_EXTRA3, 761 GZSTATE_ORIGNAME, 762 GZSTATE_COMMENT, 763 GZSTATE_HEAD_CRC1, 764 GZSTATE_HEAD_CRC2, 765 GZSTATE_INIT, 766 GZSTATE_READ, 767 GZSTATE_CRC, 768 GZSTATE_LEN, 769 } state = GZSTATE_MAGIC0; 770 int flags = 0, skip_count = 0; 771 int error = Z_STREAM_ERROR, done_reading = 0; 772 uLong crc = 0; 773 ssize_t wr; 774 int needmore = 0; 775 776 #define ADVANCE() { z.next_in++; z.avail_in--; } 777 778 if ((outbufp = malloc(BUFLEN)) == NULL) { 779 maybe_err("malloc failed"); 780 goto out2; 781 } 782 if ((inbufp = malloc(BUFLEN)) == NULL) { 783 maybe_err("malloc failed"); 784 goto out1; 785 } 786 787 memset(&z, 0, sizeof z); 788 z.avail_in = prelen; 789 z.next_in = (unsigned char *)pre; 790 z.avail_out = BUFLEN; 791 z.next_out = (unsigned char *)outbufp; 792 z.zalloc = NULL; 793 z.zfree = NULL; 794 z.opaque = 0; 795 796 in_tot = prelen; 797 out_tot = 0; 798 799 for (;;) { 800 check_siginfo(); 801 if ((z.avail_in == 0 || needmore) && done_reading == 0) { 802 ssize_t in_size; 803 804 if (z.avail_in > 0) { 805 memmove(inbufp, z.next_in, z.avail_in); 806 } 807 z.next_in = (unsigned char *)inbufp; 808 in_size = read(in, z.next_in + z.avail_in, 809 BUFLEN - z.avail_in); 810 811 if (in_size == -1) { 812 maybe_warn("failed to read stdin"); 813 goto stop_and_fail; 814 } else if (in_size == 0) { 815 done_reading = 1; 816 } 817 infile_newdata(in_size); 818 819 z.avail_in += in_size; 820 needmore = 0; 821 822 in_tot += in_size; 823 } 824 if (z.avail_in == 0) { 825 if (done_reading && state != GZSTATE_MAGIC0) { 826 maybe_warnx("%s: unexpected end of file", 827 filename); 828 goto stop_and_fail; 829 } 830 goto stop; 831 } 832 switch (state) { 833 case GZSTATE_MAGIC0: 834 if (*z.next_in != GZIP_MAGIC0) { 835 if (in_tot > 0) { 836 maybe_warnx("%s: trailing garbage " 837 "ignored", filename); 838 exit_value = 2; 839 goto stop; 840 } 841 maybe_warnx("input not gziped (MAGIC0)"); 842 goto stop_and_fail; 843 } 844 ADVANCE(); 845 state++; 846 out_sub_tot = 0; 847 crc = crc32(0L, Z_NULL, 0); 848 break; 849 850 case GZSTATE_MAGIC1: 851 if (*z.next_in != GZIP_MAGIC1 && 852 *z.next_in != GZIP_OMAGIC1) { 853 maybe_warnx("input not gziped (MAGIC1)"); 854 goto stop_and_fail; 855 } 856 ADVANCE(); 857 state++; 858 break; 859 860 case GZSTATE_METHOD: 861 if (*z.next_in != Z_DEFLATED) { 862 maybe_warnx("unknown compression method"); 863 goto stop_and_fail; 864 } 865 ADVANCE(); 866 state++; 867 break; 868 869 case GZSTATE_FLAGS: 870 flags = *z.next_in; 871 ADVANCE(); 872 skip_count = 6; 873 state++; 874 break; 875 876 case GZSTATE_SKIPPING: 877 if (skip_count > 0) { 878 skip_count--; 879 ADVANCE(); 880 } else 881 state++; 882 break; 883 884 case GZSTATE_EXTRA: 885 if ((flags & EXTRA_FIELD) == 0) { 886 state = GZSTATE_ORIGNAME; 887 break; 888 } 889 skip_count = *z.next_in; 890 ADVANCE(); 891 state++; 892 break; 893 894 case GZSTATE_EXTRA2: 895 skip_count |= ((*z.next_in) << 8); 896 ADVANCE(); 897 state++; 898 break; 899 900 case GZSTATE_EXTRA3: 901 if (skip_count > 0) { 902 skip_count--; 903 ADVANCE(); 904 } else 905 state++; 906 break; 907 908 case GZSTATE_ORIGNAME: 909 if ((flags & ORIG_NAME) == 0) { 910 state++; 911 break; 912 } 913 if (*z.next_in == 0) 914 state++; 915 ADVANCE(); 916 break; 917 918 case GZSTATE_COMMENT: 919 if ((flags & COMMENT) == 0) { 920 state++; 921 break; 922 } 923 if (*z.next_in == 0) 924 state++; 925 ADVANCE(); 926 break; 927 928 case GZSTATE_HEAD_CRC1: 929 if (flags & HEAD_CRC) 930 skip_count = 2; 931 else 932 skip_count = 0; 933 state++; 934 break; 935 936 case GZSTATE_HEAD_CRC2: 937 if (skip_count > 0) { 938 skip_count--; 939 ADVANCE(); 940 } else 941 state++; 942 break; 943 944 case GZSTATE_INIT: 945 if (inflateInit2(&z, -MAX_WBITS) != Z_OK) { 946 maybe_warnx("failed to inflateInit"); 947 goto stop_and_fail; 948 } 949 state++; 950 break; 951 952 case GZSTATE_READ: 953 error = inflate(&z, Z_FINISH); 954 switch (error) { 955 /* Z_BUF_ERROR goes with Z_FINISH... */ 956 case Z_BUF_ERROR: 957 if (z.avail_out > 0 && !done_reading) 958 continue; 959 960 case Z_STREAM_END: 961 case Z_OK: 962 break; 963 964 case Z_NEED_DICT: 965 maybe_warnx("Z_NEED_DICT error"); 966 goto stop_and_fail; 967 case Z_DATA_ERROR: 968 maybe_warnx("data stream error"); 969 goto stop_and_fail; 970 case Z_STREAM_ERROR: 971 maybe_warnx("internal stream error"); 972 goto stop_and_fail; 973 case Z_MEM_ERROR: 974 maybe_warnx("memory allocation error"); 975 goto stop_and_fail; 976 977 default: 978 maybe_warn("unknown error from inflate(): %d", 979 error); 980 } 981 wr = BUFLEN - z.avail_out; 982 983 if (wr != 0) { 984 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr); 985 if ( 986 #ifndef SMALL 987 /* don't write anything with -t */ 988 tflag == 0 && 989 #endif 990 write_retry(out, outbufp, wr) != wr) { 991 maybe_warn("error writing to output"); 992 goto stop_and_fail; 993 } 994 995 out_tot += wr; 996 out_sub_tot += wr; 997 } 998 999 if (error == Z_STREAM_END) { 1000 inflateEnd(&z); 1001 state++; 1002 } 1003 1004 z.next_out = (unsigned char *)outbufp; 1005 z.avail_out = BUFLEN; 1006 1007 break; 1008 case GZSTATE_CRC: 1009 { 1010 uLong origcrc; 1011 1012 if (z.avail_in < 4) { 1013 if (!done_reading) { 1014 needmore = 1; 1015 continue; 1016 } 1017 maybe_warnx("truncated input"); 1018 goto stop_and_fail; 1019 } 1020 origcrc = le32dec(&z.next_in[0]); 1021 if (origcrc != crc) { 1022 maybe_warnx("invalid compressed" 1023 " data--crc error"); 1024 goto stop_and_fail; 1025 } 1026 } 1027 1028 z.avail_in -= 4; 1029 z.next_in += 4; 1030 1031 if (!z.avail_in && done_reading) { 1032 goto stop; 1033 } 1034 state++; 1035 break; 1036 case GZSTATE_LEN: 1037 { 1038 uLong origlen; 1039 1040 if (z.avail_in < 4) { 1041 if (!done_reading) { 1042 needmore = 1; 1043 continue; 1044 } 1045 maybe_warnx("truncated input"); 1046 goto stop_and_fail; 1047 } 1048 origlen = le32dec(&z.next_in[0]); 1049 1050 if (origlen != out_sub_tot) { 1051 maybe_warnx("invalid compressed" 1052 " data--length error"); 1053 goto stop_and_fail; 1054 } 1055 } 1056 1057 z.avail_in -= 4; 1058 z.next_in += 4; 1059 1060 if (error < 0) { 1061 maybe_warnx("decompression error"); 1062 goto stop_and_fail; 1063 } 1064 state = GZSTATE_MAGIC0; 1065 break; 1066 } 1067 continue; 1068 stop_and_fail: 1069 out_tot = -1; 1070 stop: 1071 break; 1072 } 1073 if (state > GZSTATE_INIT) 1074 inflateEnd(&z); 1075 1076 free(inbufp); 1077 out1: 1078 free(outbufp); 1079 out2: 1080 if (gsizep) 1081 *gsizep = in_tot; 1082 return (out_tot); 1083 } 1084 1085 #ifndef SMALL 1086 /* 1087 * set the owner, mode, flags & utimes using the given file descriptor. 1088 * file is only used in possible warning messages. 1089 */ 1090 static void 1091 copymodes(int fd, const struct stat *sbp, const char *file) 1092 { 1093 struct timespec times[2]; 1094 struct stat sb; 1095 1096 /* 1097 * If we have no info on the input, give this file some 1098 * default values and return.. 1099 */ 1100 if (sbp == NULL) { 1101 mode_t mask = umask(022); 1102 1103 (void)fchmod(fd, DEFFILEMODE & ~mask); 1104 (void)umask(mask); 1105 return; 1106 } 1107 sb = *sbp; 1108 1109 /* if the chown fails, remove set-id bits as-per compress(1) */ 1110 if (fchown(fd, sb.st_uid, sb.st_gid) < 0) { 1111 if (errno != EPERM) 1112 maybe_warn("couldn't fchown: %s", file); 1113 sb.st_mode &= ~(S_ISUID|S_ISGID); 1114 } 1115 1116 /* we only allow set-id and the 9 normal permission bits */ 1117 sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 1118 if (fchmod(fd, sb.st_mode) < 0) 1119 maybe_warn("couldn't fchmod: %s", file); 1120 1121 times[0] = sb.st_atim; 1122 times[1] = sb.st_mtim; 1123 if (futimens(fd, times) < 0) 1124 maybe_warn("couldn't futimens: %s", file); 1125 1126 /* only try flags if they exist already */ 1127 if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0) 1128 maybe_warn("couldn't fchflags: %s", file); 1129 } 1130 #endif 1131 1132 /* what sort of file is this? */ 1133 static enum filetype 1134 file_gettype(u_char *buf) 1135 { 1136 1137 if (buf[0] == GZIP_MAGIC0 && 1138 (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1)) 1139 return FT_GZIP; 1140 else 1141 #ifndef NO_BZIP2_SUPPORT 1142 if (memcmp(buf, BZIP2_MAGIC, 3) == 0 && 1143 buf[3] >= '0' && buf[3] <= '9') 1144 return FT_BZIP2; 1145 else 1146 #endif 1147 #ifndef NO_COMPRESS_SUPPORT 1148 if (memcmp(buf, Z_MAGIC, 2) == 0) 1149 return FT_Z; 1150 else 1151 #endif 1152 #ifndef NO_PACK_SUPPORT 1153 if (memcmp(buf, PACK_MAGIC, 2) == 0) 1154 return FT_PACK; 1155 else 1156 #endif 1157 #ifndef NO_XZ_SUPPORT 1158 if (memcmp(buf, XZ_MAGIC, 4) == 0) /* XXX: We only have 4 bytes */ 1159 return FT_XZ; 1160 else 1161 #endif 1162 return FT_UNKNOWN; 1163 } 1164 1165 #ifndef SMALL 1166 /* check the outfile is OK. */ 1167 static int 1168 check_outfile(const char *outfile) 1169 { 1170 struct stat sb; 1171 int ok = 1; 1172 1173 if (lflag == 0 && stat(outfile, &sb) == 0) { 1174 if (fflag) 1175 unlink(outfile); 1176 else if (isatty(STDIN_FILENO)) { 1177 char ans[10] = { 'n', '\0' }; /* default */ 1178 1179 fprintf(stderr, "%s already exists -- do you wish to " 1180 "overwrite (y or n)? " , outfile); 1181 (void)fgets(ans, sizeof(ans) - 1, stdin); 1182 if (ans[0] != 'y' && ans[0] != 'Y') { 1183 fprintf(stderr, "\tnot overwriting\n"); 1184 ok = 0; 1185 } else 1186 unlink(outfile); 1187 } else { 1188 maybe_warnx("%s already exists -- skipping", outfile); 1189 ok = 0; 1190 } 1191 } 1192 return ok; 1193 } 1194 1195 static void 1196 unlink_input(const char *file, const struct stat *sb) 1197 { 1198 struct stat nsb; 1199 1200 if (kflag) 1201 return; 1202 if (stat(file, &nsb) != 0) 1203 /* Must be gone already */ 1204 return; 1205 if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino) 1206 /* Definitely a different file */ 1207 return; 1208 unlink(file); 1209 } 1210 1211 static void 1212 got_sigint(int signo __unused) 1213 { 1214 1215 if (remove_file != NULL) 1216 unlink(remove_file); 1217 _exit(2); 1218 } 1219 1220 static void 1221 got_siginfo(int signo __unused) 1222 { 1223 1224 print_info = 1; 1225 } 1226 1227 static void 1228 setup_signals(void) 1229 { 1230 1231 signal(SIGINFO, got_siginfo); 1232 signal(SIGINT, got_sigint); 1233 } 1234 1235 static void 1236 infile_newdata(size_t newdata) 1237 { 1238 1239 infile_current += newdata; 1240 } 1241 #endif 1242 1243 static void 1244 infile_set(const char *newinfile, off_t total) 1245 { 1246 1247 if (newinfile) 1248 infile = newinfile; 1249 #ifndef SMALL 1250 infile_total = total; 1251 #endif 1252 } 1253 1254 static void 1255 infile_clear(void) 1256 { 1257 1258 infile = NULL; 1259 #ifndef SMALL 1260 infile_total = infile_current = 0; 1261 #endif 1262 } 1263 1264 static const suffixes_t * 1265 check_suffix(char *file, int xlate) 1266 { 1267 const suffixes_t *s; 1268 int len = strlen(file); 1269 char *sp; 1270 1271 for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) { 1272 /* if it doesn't fit in "a.suf", don't bother */ 1273 if (s->ziplen >= len) 1274 continue; 1275 sp = file + len - s->ziplen; 1276 if (strcmp(s->zipped, sp) != 0) 1277 continue; 1278 if (xlate) 1279 strcpy(sp, s->normal); 1280 return s; 1281 } 1282 return NULL; 1283 } 1284 1285 /* 1286 * compress the given file: create a corresponding .gz file and remove the 1287 * original. 1288 */ 1289 static off_t 1290 file_compress(char *file, char *outfile, size_t outsize) 1291 { 1292 int in; 1293 int out; 1294 off_t size, in_size; 1295 #ifndef SMALL 1296 struct stat isb, osb; 1297 const suffixes_t *suff; 1298 #endif 1299 1300 in = open(file, O_RDONLY); 1301 if (in == -1) { 1302 maybe_warn("can't open %s", file); 1303 return (-1); 1304 } 1305 1306 #ifndef SMALL 1307 if (fstat(in, &isb) != 0) { 1308 maybe_warn("couldn't stat: %s", file); 1309 close(in); 1310 return (-1); 1311 } 1312 #endif 1313 1314 #ifndef SMALL 1315 if (fstat(in, &isb) != 0) { 1316 close(in); 1317 maybe_warn("can't stat %s", file); 1318 return -1; 1319 } 1320 infile_set(file, isb.st_size); 1321 #endif 1322 1323 if (cflag == 0) { 1324 #ifndef SMALL 1325 if (isb.st_nlink > 1 && fflag == 0) { 1326 maybe_warnx("%s has %ju other link%s -- " 1327 "skipping", file, 1328 (uintmax_t)isb.st_nlink - 1, 1329 isb.st_nlink == 1 ? "" : "s"); 1330 close(in); 1331 return -1; 1332 } 1333 1334 if (fflag == 0 && (suff = check_suffix(file, 0)) && 1335 suff->zipped[0] != 0) { 1336 maybe_warnx("%s already has %s suffix -- unchanged", 1337 file, suff->zipped); 1338 close(in); 1339 return (-1); 1340 } 1341 #endif 1342 1343 /* Add (usually) .gz to filename */ 1344 if ((size_t)snprintf(outfile, outsize, "%s%s", 1345 file, suffixes[0].zipped) >= outsize) 1346 memcpy(outfile + outsize - suffixes[0].ziplen - 1, 1347 suffixes[0].zipped, suffixes[0].ziplen + 1); 1348 1349 #ifndef SMALL 1350 if (check_outfile(outfile) == 0) { 1351 close(in); 1352 return (-1); 1353 } 1354 #endif 1355 } 1356 1357 if (cflag == 0) { 1358 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600); 1359 if (out == -1) { 1360 maybe_warn("could not create output: %s", outfile); 1361 fclose(stdin); 1362 return (-1); 1363 } 1364 #ifndef SMALL 1365 remove_file = outfile; 1366 #endif 1367 } else 1368 out = STDOUT_FILENO; 1369 1370 in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime); 1371 1372 (void)close(in); 1373 1374 /* 1375 * If there was an error, in_size will be -1. 1376 * If we compressed to stdout, just return the size. 1377 * Otherwise stat the file and check it is the correct size. 1378 * We only blow away the file if we can stat the output and it 1379 * has the expected size. 1380 */ 1381 if (cflag != 0) 1382 return in_size == -1 ? -1 : size; 1383 1384 #ifndef SMALL 1385 if (fstat(out, &osb) != 0) { 1386 maybe_warn("couldn't stat: %s", outfile); 1387 goto bad_outfile; 1388 } 1389 1390 if (osb.st_size != size) { 1391 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting", 1392 outfile, (uintmax_t)osb.st_size, (uintmax_t)size); 1393 goto bad_outfile; 1394 } 1395 1396 copymodes(out, &isb, outfile); 1397 remove_file = NULL; 1398 #endif 1399 if (close(out) == -1) 1400 maybe_warn("couldn't close output"); 1401 1402 /* output is good, ok to delete input */ 1403 unlink_input(file, &isb); 1404 return (size); 1405 1406 #ifndef SMALL 1407 bad_outfile: 1408 if (close(out) == -1) 1409 maybe_warn("couldn't close output"); 1410 1411 maybe_warnx("leaving original %s", file); 1412 unlink(outfile); 1413 return (size); 1414 #endif 1415 } 1416 1417 /* uncompress the given file and remove the original */ 1418 static off_t 1419 file_uncompress(char *file, char *outfile, size_t outsize) 1420 { 1421 struct stat isb, osb; 1422 off_t size; 1423 ssize_t rbytes; 1424 unsigned char header1[4]; 1425 enum filetype method; 1426 int fd, ofd, zfd = -1; 1427 int error; 1428 size_t in_size; 1429 #ifndef SMALL 1430 ssize_t rv; 1431 time_t timestamp = 0; 1432 char name[PATH_MAX + 1]; 1433 #endif 1434 1435 /* gather the old name info */ 1436 1437 fd = open(file, O_RDONLY); 1438 if (fd < 0) { 1439 maybe_warn("can't open %s", file); 1440 goto lose; 1441 } 1442 if (fstat(fd, &isb) != 0) { 1443 maybe_warn("can't stat %s", file); 1444 goto lose; 1445 } 1446 if (S_ISREG(isb.st_mode)) 1447 in_size = isb.st_size; 1448 else 1449 in_size = 0; 1450 infile_set(file, in_size); 1451 1452 strlcpy(outfile, file, outsize); 1453 if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) { 1454 maybe_warnx("%s: unknown suffix -- ignored", file); 1455 goto lose; 1456 } 1457 1458 rbytes = read(fd, header1, sizeof header1); 1459 if (rbytes != sizeof header1) { 1460 /* we don't want to fail here. */ 1461 #ifndef SMALL 1462 if (fflag) 1463 goto lose; 1464 #endif 1465 if (rbytes == -1) 1466 maybe_warn("can't read %s", file); 1467 else 1468 goto unexpected_EOF; 1469 goto lose; 1470 } 1471 infile_newdata(rbytes); 1472 1473 method = file_gettype(header1); 1474 #ifndef SMALL 1475 if (fflag == 0 && method == FT_UNKNOWN) { 1476 maybe_warnx("%s: not in gzip format", file); 1477 goto lose; 1478 } 1479 1480 #endif 1481 1482 #ifndef SMALL 1483 if (method == FT_GZIP && Nflag) { 1484 unsigned char ts[4]; /* timestamp */ 1485 1486 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP); 1487 if (rv >= 0 && rv < (ssize_t)(sizeof ts)) 1488 goto unexpected_EOF; 1489 if (rv == -1) { 1490 if (!fflag) 1491 maybe_warn("can't read %s", file); 1492 goto lose; 1493 } 1494 infile_newdata(rv); 1495 timestamp = le32dec(&ts[0]); 1496 1497 if (header1[3] & ORIG_NAME) { 1498 rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME); 1499 if (rbytes < 0) { 1500 maybe_warn("can't read %s", file); 1501 goto lose; 1502 } 1503 if (name[0] != '\0') { 1504 char *dp, *nf; 1505 1506 /* Make sure that name is NUL-terminated */ 1507 name[rbytes] = '\0'; 1508 1509 /* strip saved directory name */ 1510 nf = strrchr(name, '/'); 1511 if (nf == NULL) 1512 nf = name; 1513 else 1514 nf++; 1515 1516 /* preserve original directory name */ 1517 dp = strrchr(file, '/'); 1518 if (dp == NULL) 1519 dp = file; 1520 else 1521 dp++; 1522 snprintf(outfile, outsize, "%.*s%.*s", 1523 (int) (dp - file), 1524 file, (int) rbytes, nf); 1525 } 1526 } 1527 } 1528 #endif 1529 lseek(fd, 0, SEEK_SET); 1530 1531 if (cflag == 0 || lflag) { 1532 #ifndef SMALL 1533 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) { 1534 maybe_warnx("%s has %ju other links -- skipping", 1535 file, (uintmax_t)isb.st_nlink - 1); 1536 goto lose; 1537 } 1538 if (nflag == 0 && timestamp) 1539 isb.st_mtime = timestamp; 1540 if (check_outfile(outfile) == 0) 1541 goto lose; 1542 #endif 1543 } 1544 1545 if (cflag) 1546 zfd = STDOUT_FILENO; 1547 else if (lflag) 1548 zfd = -1; 1549 else { 1550 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600); 1551 if (zfd == STDOUT_FILENO) { 1552 /* We won't close STDOUT_FILENO later... */ 1553 zfd = dup(zfd); 1554 close(STDOUT_FILENO); 1555 } 1556 if (zfd == -1) { 1557 maybe_warn("can't open %s", outfile); 1558 goto lose; 1559 } 1560 remove_file = outfile; 1561 } 1562 1563 switch (method) { 1564 #ifndef NO_BZIP2_SUPPORT 1565 case FT_BZIP2: 1566 /* XXX */ 1567 if (lflag) { 1568 maybe_warnx("no -l with bzip2 files"); 1569 goto lose; 1570 } 1571 1572 size = unbzip2(fd, zfd, NULL, 0, NULL); 1573 break; 1574 #endif 1575 1576 #ifndef NO_COMPRESS_SUPPORT 1577 case FT_Z: { 1578 FILE *in, *out; 1579 1580 /* XXX */ 1581 if (lflag) { 1582 maybe_warnx("no -l with Lempel-Ziv files"); 1583 goto lose; 1584 } 1585 1586 if ((in = zdopen(fd)) == NULL) { 1587 maybe_warn("zdopen for read: %s", file); 1588 goto lose; 1589 } 1590 1591 out = fdopen(dup(zfd), "w"); 1592 if (out == NULL) { 1593 maybe_warn("fdopen for write: %s", outfile); 1594 fclose(in); 1595 goto lose; 1596 } 1597 1598 size = zuncompress(in, out, NULL, 0, NULL); 1599 /* need to fclose() if ferror() is true... */ 1600 error = ferror(in); 1601 if (error | fclose(in)) { 1602 if (error) 1603 maybe_warn("failed infile"); 1604 else 1605 maybe_warn("failed infile fclose"); 1606 if (cflag == 0) 1607 unlink(outfile); 1608 (void)fclose(out); 1609 goto lose; 1610 } 1611 if (fclose(out) != 0) { 1612 maybe_warn("failed outfile fclose"); 1613 if (cflag == 0) 1614 unlink(outfile); 1615 goto lose; 1616 } 1617 break; 1618 } 1619 #endif 1620 1621 #ifndef NO_PACK_SUPPORT 1622 case FT_PACK: 1623 if (lflag) { 1624 maybe_warnx("no -l with packed files"); 1625 goto lose; 1626 } 1627 1628 size = unpack(fd, zfd, NULL, 0, NULL); 1629 break; 1630 #endif 1631 1632 #ifndef NO_XZ_SUPPORT 1633 case FT_XZ: 1634 if (lflag) { 1635 maybe_warnx("no -l with xz files"); 1636 goto lose; 1637 } 1638 1639 size = unxz(fd, zfd, NULL, 0, NULL); 1640 break; 1641 #endif 1642 1643 #ifndef SMALL 1644 case FT_UNKNOWN: 1645 if (lflag) { 1646 maybe_warnx("no -l for unknown filetypes"); 1647 goto lose; 1648 } 1649 size = cat_fd(NULL, 0, NULL, fd); 1650 break; 1651 #endif 1652 default: 1653 if (lflag) { 1654 print_list(fd, in_size, outfile, isb.st_mtime); 1655 close(fd); 1656 return -1; /* XXX */ 1657 } 1658 1659 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file); 1660 break; 1661 } 1662 1663 if (close(fd) != 0) 1664 maybe_warn("couldn't close input"); 1665 if (zfd != STDOUT_FILENO && close(zfd) != 0) 1666 maybe_warn("couldn't close output"); 1667 1668 if (size == -1) { 1669 if (cflag == 0) 1670 unlink(outfile); 1671 maybe_warnx("%s: uncompress failed", file); 1672 return -1; 1673 } 1674 1675 /* if testing, or we uncompressed to stdout, this is all we need */ 1676 #ifndef SMALL 1677 if (tflag) 1678 return size; 1679 #endif 1680 /* if we are uncompressing to stdin, don't remove the file. */ 1681 if (cflag) 1682 return size; 1683 1684 /* 1685 * if we create a file... 1686 */ 1687 /* 1688 * if we can't stat the file don't remove the file. 1689 */ 1690 1691 ofd = open(outfile, O_RDWR, 0); 1692 if (ofd == -1) { 1693 maybe_warn("couldn't open (leaving original): %s", 1694 outfile); 1695 return -1; 1696 } 1697 if (fstat(ofd, &osb) != 0) { 1698 maybe_warn("couldn't stat (leaving original): %s", 1699 outfile); 1700 close(ofd); 1701 return -1; 1702 } 1703 if (osb.st_size != size) { 1704 maybe_warnx("stat gave different size: %ju != %ju (leaving original)", 1705 (uintmax_t)size, (uintmax_t)osb.st_size); 1706 close(ofd); 1707 unlink(outfile); 1708 return -1; 1709 } 1710 #ifndef SMALL 1711 copymodes(ofd, &isb, outfile); 1712 remove_file = NULL; 1713 #endif 1714 close(ofd); 1715 unlink_input(file, &isb); 1716 return size; 1717 1718 unexpected_EOF: 1719 maybe_warnx("%s: unexpected end of file", file); 1720 lose: 1721 if (fd != -1) 1722 close(fd); 1723 if (zfd != -1 && zfd != STDOUT_FILENO) 1724 close(zfd); 1725 return -1; 1726 } 1727 1728 #ifndef SMALL 1729 static void 1730 check_siginfo(void) 1731 { 1732 if (print_info == 0) 1733 return; 1734 if (infile) { 1735 if (infile_total) { 1736 int pcent = (int)((100.0 * infile_current) / infile_total); 1737 1738 fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n", 1739 infile, (unsigned long long)infile_current, 1740 (unsigned long long)infile_total, pcent); 1741 } else 1742 fprintf(stderr, "%s: done %llu bytes\n", 1743 infile, (unsigned long long)infile_current); 1744 } 1745 print_info = 0; 1746 } 1747 1748 static off_t 1749 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd) 1750 { 1751 char buf[BUFLEN]; 1752 off_t in_tot; 1753 ssize_t w; 1754 1755 in_tot = count; 1756 w = write_retry(STDOUT_FILENO, prepend, count); 1757 if (w == -1 || (size_t)w != count) { 1758 maybe_warn("write to stdout"); 1759 return -1; 1760 } 1761 for (;;) { 1762 ssize_t rv; 1763 1764 rv = read(fd, buf, sizeof buf); 1765 if (rv == 0) 1766 break; 1767 if (rv < 0) { 1768 maybe_warn("read from fd %d", fd); 1769 break; 1770 } 1771 infile_newdata(rv); 1772 1773 if (write_retry(STDOUT_FILENO, buf, rv) != rv) { 1774 maybe_warn("write to stdout"); 1775 break; 1776 } 1777 in_tot += rv; 1778 } 1779 1780 if (gsizep) 1781 *gsizep = in_tot; 1782 return (in_tot); 1783 } 1784 #endif 1785 1786 static void 1787 handle_stdin(void) 1788 { 1789 struct stat isb; 1790 unsigned char header1[4]; 1791 size_t in_size; 1792 off_t usize, gsize; 1793 enum filetype method; 1794 ssize_t bytes_read; 1795 #ifndef NO_COMPRESS_SUPPORT 1796 FILE *in; 1797 #endif 1798 1799 #ifndef SMALL 1800 if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) { 1801 maybe_warnx("standard input is a terminal -- ignoring"); 1802 goto out; 1803 } 1804 #endif 1805 1806 if (fstat(STDIN_FILENO, &isb) < 0) { 1807 maybe_warn("fstat"); 1808 goto out; 1809 } 1810 if (S_ISREG(isb.st_mode)) 1811 in_size = isb.st_size; 1812 else 1813 in_size = 0; 1814 infile_set("(stdin)", in_size); 1815 1816 if (lflag) { 1817 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime); 1818 goto out; 1819 } 1820 1821 bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1); 1822 if (bytes_read == -1) { 1823 maybe_warn("can't read stdin"); 1824 goto out; 1825 } else if (bytes_read != sizeof(header1)) { 1826 maybe_warnx("(stdin): unexpected end of file"); 1827 goto out; 1828 } 1829 1830 method = file_gettype(header1); 1831 switch (method) { 1832 default: 1833 #ifndef SMALL 1834 if (fflag == 0) { 1835 maybe_warnx("unknown compression format"); 1836 goto out; 1837 } 1838 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO); 1839 break; 1840 #endif 1841 case FT_GZIP: 1842 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO, 1843 (char *)header1, sizeof header1, &gsize, "(stdin)"); 1844 break; 1845 #ifndef NO_BZIP2_SUPPORT 1846 case FT_BZIP2: 1847 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO, 1848 (char *)header1, sizeof header1, &gsize); 1849 break; 1850 #endif 1851 #ifndef NO_COMPRESS_SUPPORT 1852 case FT_Z: 1853 if ((in = zdopen(STDIN_FILENO)) == NULL) { 1854 maybe_warnx("zopen of stdin"); 1855 goto out; 1856 } 1857 1858 usize = zuncompress(in, stdout, (char *)header1, 1859 sizeof header1, &gsize); 1860 fclose(in); 1861 break; 1862 #endif 1863 #ifndef NO_PACK_SUPPORT 1864 case FT_PACK: 1865 usize = unpack(STDIN_FILENO, STDOUT_FILENO, 1866 (char *)header1, sizeof header1, &gsize); 1867 break; 1868 #endif 1869 #ifndef NO_XZ_SUPPORT 1870 case FT_XZ: 1871 usize = unxz(STDIN_FILENO, STDOUT_FILENO, 1872 (char *)header1, sizeof header1, &gsize); 1873 break; 1874 #endif 1875 } 1876 1877 #ifndef SMALL 1878 if (vflag && !tflag && usize != -1 && gsize != -1) 1879 print_verbage(NULL, NULL, usize, gsize); 1880 if (vflag && tflag) 1881 print_test("(stdin)", usize != -1); 1882 #else 1883 (void)&usize; 1884 #endif 1885 1886 out: 1887 infile_clear(); 1888 } 1889 1890 static void 1891 handle_stdout(void) 1892 { 1893 off_t gsize; 1894 #ifndef SMALL 1895 off_t usize; 1896 struct stat sb; 1897 time_t systime; 1898 uint32_t mtime; 1899 int ret; 1900 1901 infile_set("(stdout)", 0); 1902 1903 if (fflag == 0 && isatty(STDOUT_FILENO)) { 1904 maybe_warnx("standard output is a terminal -- ignoring"); 1905 return; 1906 } 1907 1908 /* If stdin is a file use its mtime, otherwise use current time */ 1909 ret = fstat(STDIN_FILENO, &sb); 1910 if (ret < 0) { 1911 maybe_warn("Can't stat stdin"); 1912 return; 1913 } 1914 1915 if (S_ISREG(sb.st_mode)) { 1916 infile_set("(stdout)", sb.st_size); 1917 mtime = (uint32_t)sb.st_mtime; 1918 } else { 1919 systime = time(NULL); 1920 if (systime == -1) { 1921 maybe_warn("time"); 1922 return; 1923 } 1924 mtime = (uint32_t)systime; 1925 } 1926 1927 usize = 1928 #endif 1929 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime); 1930 #ifndef SMALL 1931 if (vflag && !tflag && usize != -1 && gsize != -1) 1932 print_verbage(NULL, NULL, usize, gsize); 1933 #endif 1934 } 1935 1936 /* do what is asked for, for the path name */ 1937 static void 1938 handle_pathname(char *path) 1939 { 1940 char *opath = path, *s = NULL; 1941 ssize_t len; 1942 int slen; 1943 struct stat sb; 1944 1945 /* check for stdout/stdin */ 1946 if (path[0] == '-' && path[1] == '\0') { 1947 if (dflag) 1948 handle_stdin(); 1949 else 1950 handle_stdout(); 1951 return; 1952 } 1953 1954 retry: 1955 if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 && 1956 lstat(path, &sb) != 0)) { 1957 /* lets try <path>.gz if we're decompressing */ 1958 if (dflag && s == NULL && errno == ENOENT) { 1959 len = strlen(path); 1960 slen = suffixes[0].ziplen; 1961 s = malloc(len + slen + 1); 1962 if (s == NULL) 1963 maybe_err("malloc"); 1964 memcpy(s, path, len); 1965 memcpy(s + len, suffixes[0].zipped, slen + 1); 1966 path = s; 1967 goto retry; 1968 } 1969 maybe_warn("can't stat: %s", opath); 1970 goto out; 1971 } 1972 1973 if (S_ISDIR(sb.st_mode)) { 1974 #ifndef SMALL 1975 if (rflag) 1976 handle_dir(path); 1977 else 1978 #endif 1979 maybe_warnx("%s is a directory", path); 1980 goto out; 1981 } 1982 1983 if (S_ISREG(sb.st_mode)) 1984 handle_file(path, &sb); 1985 else 1986 maybe_warnx("%s is not a regular file", path); 1987 1988 out: 1989 if (s) 1990 free(s); 1991 } 1992 1993 /* compress/decompress a file */ 1994 static void 1995 handle_file(char *file, struct stat *sbp) 1996 { 1997 off_t usize, gsize; 1998 char outfile[PATH_MAX]; 1999 2000 infile_set(file, sbp->st_size); 2001 if (dflag) { 2002 usize = file_uncompress(file, outfile, sizeof(outfile)); 2003 #ifndef SMALL 2004 if (vflag && tflag) 2005 print_test(file, usize != -1); 2006 #endif 2007 if (usize == -1) 2008 return; 2009 gsize = sbp->st_size; 2010 } else { 2011 gsize = file_compress(file, outfile, sizeof(outfile)); 2012 if (gsize == -1) 2013 return; 2014 usize = sbp->st_size; 2015 } 2016 infile_clear(); 2017 2018 #ifndef SMALL 2019 if (vflag && !tflag) 2020 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize); 2021 #endif 2022 } 2023 2024 #ifndef SMALL 2025 /* this is used with -r to recursively descend directories */ 2026 static void 2027 handle_dir(char *dir) 2028 { 2029 char *path_argv[2]; 2030 FTS *fts; 2031 FTSENT *entry; 2032 2033 path_argv[0] = dir; 2034 path_argv[1] = 0; 2035 fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL); 2036 if (fts == NULL) { 2037 warn("couldn't fts_open %s", dir); 2038 return; 2039 } 2040 2041 while ((entry = fts_read(fts))) { 2042 switch(entry->fts_info) { 2043 case FTS_D: 2044 case FTS_DP: 2045 continue; 2046 2047 case FTS_DNR: 2048 case FTS_ERR: 2049 case FTS_NS: 2050 maybe_warn("%s", entry->fts_path); 2051 continue; 2052 case FTS_F: 2053 handle_file(entry->fts_path, entry->fts_statp); 2054 } 2055 } 2056 (void)fts_close(fts); 2057 } 2058 #endif 2059 2060 /* print a ratio - size reduction as a fraction of uncompressed size */ 2061 static void 2062 print_ratio(off_t in, off_t out, FILE *where) 2063 { 2064 int percent10; /* 10 * percent */ 2065 off_t diff; 2066 char buff[8]; 2067 int len; 2068 2069 diff = in - out/2; 2070 if (in == 0 && out == 0) 2071 percent10 = 0; 2072 else if (diff < 0) 2073 /* 2074 * Output is more than double size of input! print -99.9% 2075 * Quite possibly we've failed to get the original size. 2076 */ 2077 percent10 = -999; 2078 else { 2079 /* 2080 * We only need 12 bits of result from the final division, 2081 * so reduce the values until a 32bit division will suffice. 2082 */ 2083 while (in > 0x100000) { 2084 diff >>= 1; 2085 in >>= 1; 2086 } 2087 if (in != 0) 2088 percent10 = ((u_int)diff * 2000) / (u_int)in - 1000; 2089 else 2090 percent10 = 0; 2091 } 2092 2093 len = snprintf(buff, sizeof buff, "%2.2d.", percent10); 2094 /* Move the '.' to before the last digit */ 2095 buff[len - 1] = buff[len - 2]; 2096 buff[len - 2] = '.'; 2097 fprintf(where, "%5s%%", buff); 2098 } 2099 2100 #ifndef SMALL 2101 /* print compression statistics, and the new name (if there is one!) */ 2102 static void 2103 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize) 2104 { 2105 if (file) 2106 fprintf(stderr, "%s:%s ", file, 2107 strlen(file) < 7 ? "\t\t" : "\t"); 2108 print_ratio(usize, gsize, stderr); 2109 if (nfile) 2110 fprintf(stderr, " -- replaced with %s", nfile); 2111 fprintf(stderr, "\n"); 2112 fflush(stderr); 2113 } 2114 2115 /* print test results */ 2116 static void 2117 print_test(const char *file, int ok) 2118 { 2119 2120 if (exit_value == 0 && ok == 0) 2121 exit_value = 1; 2122 fprintf(stderr, "%s:%s %s\n", file, 2123 strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK"); 2124 fflush(stderr); 2125 } 2126 #endif 2127 2128 /* print a file's info ala --list */ 2129 /* eg: 2130 compressed uncompressed ratio uncompressed_name 2131 354841 1679360 78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar 2132 */ 2133 static void 2134 print_list(int fd, off_t out, const char *outfile, time_t ts) 2135 { 2136 static int first = 1; 2137 #ifndef SMALL 2138 static off_t in_tot, out_tot; 2139 uint32_t crc = 0; 2140 #endif 2141 off_t in = 0, rv; 2142 2143 if (first) { 2144 #ifndef SMALL 2145 if (vflag) 2146 printf("method crc date time "); 2147 #endif 2148 if (qflag == 0) 2149 printf(" compressed uncompressed " 2150 "ratio uncompressed_name\n"); 2151 } 2152 first = 0; 2153 2154 /* print totals? */ 2155 #ifndef SMALL 2156 if (fd == -1) { 2157 in = in_tot; 2158 out = out_tot; 2159 } else 2160 #endif 2161 { 2162 /* read the last 4 bytes - this is the uncompressed size */ 2163 rv = lseek(fd, (off_t)(-8), SEEK_END); 2164 if (rv != -1) { 2165 unsigned char buf[8]; 2166 uint32_t usize; 2167 2168 rv = read(fd, (char *)buf, sizeof(buf)); 2169 if (rv == -1) 2170 maybe_warn("read of uncompressed size"); 2171 else if (rv != sizeof(buf)) 2172 maybe_warnx("read of uncompressed size"); 2173 2174 else { 2175 usize = le32dec(&buf[4]); 2176 in = (off_t)usize; 2177 #ifndef SMALL 2178 crc = le32dec(&buf[0]); 2179 #endif 2180 } 2181 } 2182 } 2183 2184 #ifndef SMALL 2185 if (vflag && fd == -1) 2186 printf(" "); 2187 else if (vflag) { 2188 char *date = ctime(&ts); 2189 2190 /* skip the day, 1/100th second, and year */ 2191 date += 4; 2192 date[12] = 0; 2193 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date); 2194 } 2195 in_tot += in; 2196 out_tot += out; 2197 #else 2198 (void)&ts; /* XXX */ 2199 #endif 2200 printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in); 2201 print_ratio(in, out, stdout); 2202 printf(" %s\n", outfile); 2203 } 2204 2205 /* display the usage of NetBSD gzip */ 2206 static void 2207 usage(void) 2208 { 2209 2210 fprintf(stderr, "%s\n", gzip_version); 2211 fprintf(stderr, 2212 #ifdef SMALL 2213 "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n", 2214 #else 2215 "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n" 2216 " -1 --fast fastest (worst) compression\n" 2217 " -2 .. -8 set compression level\n" 2218 " -9 --best best (slowest) compression\n" 2219 " -c --stdout write to stdout, keep original files\n" 2220 " --to-stdout\n" 2221 " -d --decompress uncompress files\n" 2222 " --uncompress\n" 2223 " -f --force force overwriting & compress links\n" 2224 " -h --help display this help\n" 2225 " -k --keep don't delete input files during operation\n" 2226 " -l --list list compressed file contents\n" 2227 " -N --name save or restore original file name and time stamp\n" 2228 " -n --no-name don't save original file name or time stamp\n" 2229 " -q --quiet output no warnings\n" 2230 " -r --recursive recursively compress files in directories\n" 2231 " -S .suf use suffix .suf instead of .gz\n" 2232 " --suffix .suf\n" 2233 " -t --test test compressed file\n" 2234 " -V --version display program version\n" 2235 " -v --verbose print extra statistics\n", 2236 #endif 2237 getprogname()); 2238 exit(0); 2239 } 2240 2241 #ifndef SMALL 2242 /* display the license information of FreeBSD gzip */ 2243 static void 2244 display_license(void) 2245 { 2246 2247 fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version); 2248 fprintf(stderr, "%s\n", gzip_copyright); 2249 exit(0); 2250 } 2251 #endif 2252 2253 /* display the version of NetBSD gzip */ 2254 static void 2255 display_version(void) 2256 { 2257 2258 fprintf(stderr, "%s\n", gzip_version); 2259 exit(0); 2260 } 2261 2262 #ifndef NO_BZIP2_SUPPORT 2263 #include "unbzip2.c" 2264 #endif 2265 #ifndef NO_COMPRESS_SUPPORT 2266 #include "zuncompress.c" 2267 #endif 2268 #ifndef NO_PACK_SUPPORT 2269 #include "unpack.c" 2270 #endif 2271 #ifndef NO_XZ_SUPPORT 2272 #include "unxz.c" 2273 #endif 2274 2275 static ssize_t 2276 read_retry(int fd, void *buf, size_t sz) 2277 { 2278 char *cp = buf; 2279 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2280 2281 while (left > 0) { 2282 ssize_t ret; 2283 2284 ret = read(fd, cp, left); 2285 if (ret == -1) { 2286 return ret; 2287 } else if (ret == 0) { 2288 break; /* EOF */ 2289 } 2290 cp += ret; 2291 left -= ret; 2292 } 2293 2294 return sz - left; 2295 } 2296 2297 static ssize_t 2298 write_retry(int fd, const void *buf, size_t sz) 2299 { 2300 const char *cp = buf; 2301 size_t left = MIN(sz, (size_t) SSIZE_MAX); 2302 2303 while (left > 0) { 2304 ssize_t ret; 2305 2306 ret = write(fd, cp, left); 2307 if (ret == -1) { 2308 return ret; 2309 } else if (ret == 0) { 2310 abort(); /* Can't happen */ 2311 } 2312 cp += ret; 2313 left -= ret; 2314 } 2315 2316 return sz - left; 2317 } 2318