usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.109 2015/10/27 07:36:18 mrg Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #ifndef lint
  32 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006\
  33  Matthew R. Green.  All rights reserved.");
  34 __FBSDID("$FreeBSD$");
  35 #endif /* not lint */
  36
  37 /*
  38  * gzip.c -- GPL free gzip using zlib.
  39  *
  40  * RFC 1950 covers the zlib format
  41  * RFC 1951 covers the deflate format
  42  * RFC 1952 covers the gzip format
  43  *
  44  * TODO:
  45  *      - use mmap where possible
  46  *      - make bzip2/compress -v/-t/-l support work as well as possible
  47  */
  48
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51 #include <sys/time.h>
  52
  53 #include <inttypes.h>
  54 #include <unistd.h>
  55 #include <stdio.h>
  56 #include <string.h>
  57 #include <stdlib.h>
  58 #include <err.h>
  59 #include <errno.h>
  60 #include <fcntl.h>
  61 #include <zlib.h>
  62 #include <fts.h>
  63 #include <libgen.h>
  64 #include <stdarg.h>
  65 #include <getopt.h>
  66 #include <time.h>
  67
  68 /* what type of file are we dealing with */
  69 enum filetype {
  70         FT_GZIP,
  71 #ifndef NO_BZIP2_SUPPORT
  72         FT_BZIP2,
  73 #endif
  74 #ifndef NO_COMPRESS_SUPPORT
  75         FT_Z,
  76 #endif
  77 #ifndef NO_PACK_SUPPORT
  78         FT_PACK,
  79 #endif
  80 #ifndef NO_XZ_SUPPORT
  81         FT_XZ,
  82 #endif
  83         FT_LAST,
  84         FT_UNKNOWN
  85 };
  86
  87 #ifndef NO_BZIP2_SUPPORT
  88 #include <bzlib.h>
  89
  90 #define BZ2_SUFFIX      ".bz2"
  91 #define BZIP2_MAGIC     "\102\132\150"
  92 #endif
  93
  94 #ifndef NO_COMPRESS_SUPPORT
  95 #define Z_SUFFIX        ".Z"
  96 #define Z_MAGIC         "\037\235"
  97 #endif
  98
  99 #ifndef NO_PACK_SUPPORT
 100 #define PACK_MAGIC      "\037\036"
 101 #endif
 102
 103 #ifndef NO_XZ_SUPPORT
 104 #include <lzma.h>
 105 #define XZ_SUFFIX       ".xz"
 106 #define XZ_MAGIC        "\3757zXZ"
 107 #endif
 108
 109 #define GZ_SUFFIX       ".gz"
 110
 111 #define BUFLEN          (64 * 1024)
 112
 113 #define GZIP_MAGIC0     0x1F
 114 #define GZIP_MAGIC1     0x8B
 115 #define GZIP_OMAGIC1    0x9E
 116
 117 #define GZIP_TIMESTAMP  (off_t)4
 118 #define GZIP_ORIGNAME   (off_t)10
 119
 120 #define HEAD_CRC        0x02
 121 #define EXTRA_FIELD     0x04
 122 #define ORIG_NAME       0x08
 123 #define COMMENT         0x10
 124
 125 #define OS_CODE         3       /* Unix */
 126
 127 typedef struct {
 128     const char  *zipped;
 129     int         ziplen;
 130     const char  *normal;        /* for unzip - must not be longer than zipped */
 131 } suffixes_t;
 132 static suffixes_t suffixes[] = {
 133 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 134         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 135 #ifndef SMALL
 136         SUFFIX(GZ_SUFFIX,       ""),
 137         SUFFIX(".z",            ""),
 138         SUFFIX("-gz",           ""),
 139         SUFFIX("-z",            ""),
 140         SUFFIX("_z",            ""),
 141         SUFFIX(".taz",          ".tar"),
 142         SUFFIX(".tgz",          ".tar"),
 143 #ifndef NO_BZIP2_SUPPORT
 144         SUFFIX(BZ2_SUFFIX,      ""),
 145         SUFFIX(".tbz",          ".tar"),
 146         SUFFIX(".tbz2",         ".tar"),
 147 #endif
 148 #ifndef NO_COMPRESS_SUPPORT
 149         SUFFIX(Z_SUFFIX,        ""),
 150 #endif
 151 #ifndef NO_XZ_SUPPORT
 152         SUFFIX(XZ_SUFFIX,       ""),
 153 #endif
 154         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 155 #endif /* SMALL */
 156 #undef SUFFIX
 157 };
 158 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0])
 159 #define SUFFIX_MAXLEN   30
 160
 161 static  const char      gzip_version[] = "FreeBSD gzip 20150413";
 162
 163 #ifndef SMALL
 164 static  const char      gzip_copyright[] = \
 165 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
 166 "   All rights reserved.\n"
 167 "\n"
 168 "   Redistribution and use in source and binary forms, with or without\n"
 169 "   modification, are permitted provided that the following conditions\n"
 170 "   are met:\n"
 171 "   1. Redistributions of source code must retain the above copyright\n"
 172 "      notice, this list of conditions and the following disclaimer.\n"
 173 "   2. Redistributions in binary form must reproduce the above copyright\n"
 174 "      notice, this list of conditions and the following disclaimer in the\n"
 175 "      documentation and/or other materials provided with the distribution.\n"
 176 "\n"
 177 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
 178 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
 179 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
 180 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
 181 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
 182 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
 183 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
 184 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
 185 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
 186 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
 187 "   SUCH DAMAGE.";
 188 #endif
 189
 190 static  int     cflag;                  /* stdout mode */
 191 static  int     dflag;                  /* decompress mode */
 192 static  int     lflag;                  /* list mode */
 193 static  int     numflag = 6;            /* gzip -1..-9 value */
 194
 195 #ifndef SMALL
 196 static  int     fflag;                  /* force mode */
 197 static  int     kflag;                  /* don't delete input files */
 198 static  int     nflag;                  /* don't save name/timestamp */
 199 static  int     Nflag;                  /* don't restore name/timestamp */
 200 static  int     qflag;                  /* quiet mode */
 201 static  int     rflag;                  /* recursive mode */
 202 static  int     tflag;                  /* test */
 203 static  int     vflag;                  /* verbose mode */
 204 static  const char *remove_file = NULL; /* file to be removed upon SIGINT */
 205 #else
 206 #define         qflag   0
 207 #define         tflag   0
 208 #endif
 209
 210 static  int     exit_value = 0;         /* exit value */
 211
 212 static  char    *infile;                /* name of file coming in */
 213
 214 static  void    maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
 215 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 216     !defined(NO_XZ_SUPPORT)
 217 static  void    maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
 218 #endif
 219 static  void    maybe_warn(const char *fmt, ...) __printflike(1, 2);
 220 static  void    maybe_warnx(const char *fmt, ...) __printflike(1, 2);
 221 static  enum filetype file_gettype(u_char *);
 222 #ifdef SMALL
 223 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 224 #endif
 225 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 226 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 227 static  off_t   file_compress(char *, char *, size_t);
 228 static  off_t   file_uncompress(char *, char *, size_t);
 229 static  void    handle_pathname(char *);
 230 static  void    handle_file(char *, struct stat *);
 231 static  void    handle_stdin(void);
 232 static  void    handle_stdout(void);
 233 static  void    print_ratio(off_t, off_t, FILE *);
 234 static  void    print_list(int fd, off_t, const char *, time_t);
 235 static  void    usage(void) __dead2;
 236 static  void    display_version(void) __dead2;
 237 #ifndef SMALL
 238 static  void    display_license(void);
 239 static  void    sigint_handler(int);
 240 #endif
 241 static  const suffixes_t *check_suffix(char *, int);
 242 static  ssize_t read_retry(int, void *, size_t);
 243
 244 #ifdef SMALL
 245 #define unlink_input(f, sb) unlink(f)
 246 #else
 247 static  off_t   cat_fd(unsigned char *, size_t, off_t *, int fd);
 248 static  void    prepend_gzip(char *, int *, char ***);
 249 static  void    handle_dir(char *);
 250 static  void    print_verbage(const char *, const char *, off_t, off_t);
 251 static  void    print_test(const char *, int);
 252 static  void    copymodes(int fd, const struct stat *, const char *file);
 253 static  int     check_outfile(const char *outfile);
 254 #endif
 255
 256 #ifndef NO_BZIP2_SUPPORT
 257 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 258 #endif
 259
 260 #ifndef NO_COMPRESS_SUPPORT
 261 static  FILE    *zdopen(int);
 262 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 263 #endif
 264
 265 #ifndef NO_PACK_SUPPORT
 266 static  off_t   unpack(int, int, char *, size_t, off_t *);
 267 #endif
 268
 269 #ifndef NO_XZ_SUPPORT
 270 static  off_t   unxz(int, int, char *, size_t, off_t *);
 271 #endif
 272
 273 #ifdef SMALL
 274 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 275 #else
 276 static const struct option longopts[] = {
 277         { "stdout",             no_argument,            0,      'c' },
 278         { "to-stdout",          no_argument,            0,      'c' },
 279         { "decompress",         no_argument,            0,      'd' },
 280         { "uncompress",         no_argument,            0,      'd' },
 281         { "force",              no_argument,            0,      'f' },
 282         { "help",               no_argument,            0,      'h' },
 283         { "keep",               no_argument,            0,      'k' },
 284         { "list",               no_argument,            0,      'l' },
 285         { "no-name",            no_argument,            0,      'n' },
 286         { "name",               no_argument,            0,      'N' },
 287         { "quiet",              no_argument,            0,      'q' },
 288         { "recursive",          no_argument,            0,      'r' },
 289         { "suffix",             required_argument,      0,      'S' },
 290         { "test",               no_argument,            0,      't' },
 291         { "verbose",            no_argument,            0,      'v' },
 292         { "version",            no_argument,            0,      'V' },
 293         { "fast",               no_argument,            0,      '1' },
 294         { "best",               no_argument,            0,      '9' },
 295         { "ascii",              no_argument,            0,      'a' },
 296         { "license",            no_argument,            0,      'L' },
 297         { NULL,                 no_argument,            0,      0 },
 298 };
 299 #endif
 300
 301 int
 302 main(int argc, char **argv)
 303 {
 304         const char *progname = getprogname();
 305 #ifndef SMALL
 306         char *gzip;
 307         int len;
 308 #endif
 309         int ch;
 310
 311 #ifndef SMALL
 312         if ((gzip = getenv("GZIP")) != NULL)
 313                 prepend_gzip(gzip, &argc, &argv);
 314         signal(SIGINT, sigint_handler);
 315 #endif
 316
 317         /*
 318          * XXX
 319          * handle being called `gunzip', `zcat' and `gzcat'
 320          */
 321         if (strcmp(progname, "gunzip") == 0)
 322                 dflag = 1;
 323         else if (strcmp(progname, "zcat") == 0 ||
 324                  strcmp(progname, "gzcat") == 0)
 325                 dflag = cflag = 1;
 326
 327 #ifdef SMALL
 328 #define OPT_LIST "123456789cdhlV"
 329 #else
 330 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
 331 #endif
 332
 333         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 334                 switch (ch) {
 335                 case '1': case '2': case '3':
 336                 case '4': case '5': case '6':
 337                 case '7': case '8': case '9':
 338                         numflag = ch - '0';
 339                         break;
 340                 case 'c':
 341                         cflag = 1;
 342                         break;
 343                 case 'd':
 344                         dflag = 1;
 345                         break;
 346                 case 'l':
 347                         lflag = 1;
 348                         dflag = 1;
 349                         break;
 350                 case 'V':
 351                         display_version();
 352                         /* NOTREACHED */
 353 #ifndef SMALL
 354                 case 'a':
 355                         fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
 356                         break;
 357                 case 'f':
 358                         fflag = 1;
 359                         break;
 360                 case 'k':
 361                         kflag = 1;
 362                         break;
 363                 case 'L':
 364                         display_license();
 365                         /* NOT REACHED */
 366                 case 'N':
 367                         nflag = 0;
 368                         Nflag = 1;
 369                         break;
 370                 case 'n':
 371                         nflag = 1;
 372                         Nflag = 0;
 373                         break;
 374                 case 'q':
 375                         qflag = 1;
 376                         break;
 377                 case 'r':
 378                         rflag = 1;
 379                         break;
 380                 case 'S':
 381                         len = strlen(optarg);
 382                         if (len != 0) {
 383                                 if (len > SUFFIX_MAXLEN)
 384                                         errx(1, "incorrect suffix: '%s': too long", optarg);
 385                                 suffixes[0].zipped = optarg;
 386                                 suffixes[0].ziplen = len;
 387                         } else {
 388                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 389                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 390                         }
 391                         break;
 392                 case 't':
 393                         cflag = 1;
 394                         tflag = 1;
 395                         dflag = 1;
 396                         break;
 397                 case 'v':
 398                         vflag = 1;
 399                         break;
 400 #endif
 401                 default:
 402                         usage();
 403                         /* NOTREACHED */
 404                 }
 405         }
 406         argv += optind;
 407         argc -= optind;
 408
 409         if (argc == 0) {
 410                 if (dflag)      /* stdin mode */
 411                         handle_stdin();
 412                 else            /* stdout mode */
 413                         handle_stdout();
 414         } else {
 415                 do {
 416                         handle_pathname(argv[0]);
 417                 } while (*++argv);
 418         }
 419 #ifndef SMALL
 420         if (qflag == 0 && lflag && argc > 1)
 421                 print_list(-1, 0, "(totals)", 0);
 422 #endif
 423         exit(exit_value);
 424 }
 425
 426 /* maybe print a warning */
 427 void
 428 maybe_warn(const char *fmt, ...)
 429 {
 430         va_list ap;
 431
 432         if (qflag == 0) {
 433                 va_start(ap, fmt);
 434                 vwarn(fmt, ap);
 435                 va_end(ap);
 436         }
 437         if (exit_value == 0)
 438                 exit_value = 1;
 439 }
 440
 441 /* ... without an errno. */
 442 void
 443 maybe_warnx(const char *fmt, ...)
 444 {
 445         va_list ap;
 446
 447         if (qflag == 0) {
 448                 va_start(ap, fmt);
 449                 vwarnx(fmt, ap);
 450                 va_end(ap);
 451         }
 452         if (exit_value == 0)
 453                 exit_value = 1;
 454 }
 455
 456 /* maybe print an error */
 457 void
 458 maybe_err(const char *fmt, ...)
 459 {
 460         va_list ap;
 461
 462         if (qflag == 0) {
 463                 va_start(ap, fmt);
 464                 vwarn(fmt, ap);
 465                 va_end(ap);
 466         }
 467         exit(2);
 468 }
 469
 470 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 471     !defined(NO_XZ_SUPPORT)
 472 /* ... without an errno. */
 473 void
 474 maybe_errx(const char *fmt, ...)
 475 {
 476         va_list ap;
 477
 478         if (qflag == 0) {
 479                 va_start(ap, fmt);
 480                 vwarnx(fmt, ap);
 481                 va_end(ap);
 482         }
 483         exit(2);
 484 }
 485 #endif
 486
 487 #ifndef SMALL
 488 /* split up $GZIP and prepend it to the argument list */
 489 static void
 490 prepend_gzip(char *gzip, int *argc, char ***argv)
 491 {
 492         char *s, **nargv, **ac;
 493         int nenvarg = 0, i;
 494
 495         /* scan how many arguments there are */
 496         for (s = gzip;;) {
 497                 while (*s == ' ' || *s == '\t')
 498                         s++;
 499                 if (*s == 0)
 500                         goto count_done;
 501                 nenvarg++;
 502                 while (*s != ' ' && *s != '\t')
 503                         if (*s++ == 0)
 504                                 goto count_done;
 505         }
 506 count_done:
 507         /* punt early */
 508         if (nenvarg == 0)
 509                 return;
 510
 511         *argc += nenvarg;
 512         ac = *argv;
 513
 514         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 515         if (nargv == NULL)
 516                 maybe_err("malloc");
 517
 518         /* stash this away */
 519         *argv = nargv;
 520
 521         /* copy the program name first */
 522         i = 0;
 523         nargv[i++] = *(ac++);
 524
 525         /* take a copy of $GZIP and add it to the array */
 526         s = strdup(gzip);
 527         if (s == NULL)
 528                 maybe_err("strdup");
 529         for (;;) {
 530                 /* Skip whitespaces. */
 531                 while (*s == ' ' || *s == '\t')
 532                         s++;
 533                 if (*s == 0)
 534                         goto copy_done;
 535                 nargv[i++] = s;
 536                 /* Find the end of this argument. */
 537                 while (*s != ' ' && *s != '\t')
 538                         if (*s++ == 0)
 539                                 /* Argument followed by NUL. */
 540                                 goto copy_done;
 541                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 542                 *s++ = 0;
 543         }
 544 copy_done:
 545
 546         /* copy the original arguments and a NULL */
 547         while (*ac)
 548                 nargv[i++] = *(ac++);
 549         nargv[i] = NULL;
 550 }
 551 #endif
 552
 553 /* compress input to output. Return bytes read, -1 on error */
 554 static off_t
 555 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 556 {
 557         z_stream z;
 558         char *outbufp, *inbufp;
 559         off_t in_tot = 0, out_tot = 0;
 560         ssize_t in_size;
 561         int i, error;
 562         uLong crc;
 563 #ifdef SMALL
 564         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 565                                  0, 0, 0, 0,
 566                                  0, OS_CODE };
 567 #endif
 568
 569         outbufp = malloc(BUFLEN);
 570         inbufp = malloc(BUFLEN);
 571         if (outbufp == NULL || inbufp == NULL) {
 572                 maybe_err("malloc failed");
 573                 goto out;
 574         }
 575
 576         memset(&z, 0, sizeof z);
 577         z.zalloc = Z_NULL;
 578         z.zfree = Z_NULL;
 579         z.opaque = 0;
 580
 581 #ifdef SMALL
 582         memcpy(outbufp, header, sizeof header);
 583         i = sizeof header;
 584 #else
 585         if (nflag != 0) {
 586                 mtime = 0;
 587                 origname = "";
 588         }
 589
 590         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 591                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 592                      *origname ? ORIG_NAME : 0,
 593                      mtime & 0xff,
 594                      (mtime >> 8) & 0xff,
 595                      (mtime >> 16) & 0xff,
 596                      (mtime >> 24) & 0xff,
 597                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 598                      OS_CODE, origname);
 599         if (i >= BUFLEN)
 600                 /* this need PATH_MAX > BUFLEN ... */
 601                 maybe_err("snprintf");
 602         if (*origname)
 603                 i++;
 604 #endif
 605
 606         z.next_out = (unsigned char *)outbufp + i;
 607         z.avail_out = BUFLEN - i;
 608
 609         error = deflateInit2(&z, numflag, Z_DEFLATED,
 610                              (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
 611         if (error != Z_OK) {
 612                 maybe_warnx("deflateInit2 failed");
 613                 in_tot = -1;
 614                 goto out;
 615         }
 616
 617         crc = crc32(0L, Z_NULL, 0);
 618         for (;;) {
 619                 if (z.avail_out == 0) {
 620                         if (write(out, outbufp, BUFLEN) != BUFLEN) {
 621                                 maybe_warn("write");
 622                                 out_tot = -1;
 623                                 goto out;
 624                         }
 625
 626                         out_tot += BUFLEN;
 627                         z.next_out = (unsigned char *)outbufp;
 628                         z.avail_out = BUFLEN;
 629                 }
 630
 631                 if (z.avail_in == 0) {
 632                         in_size = read(in, inbufp, BUFLEN);
 633                         if (in_size < 0) {
 634                                 maybe_warn("read");
 635                                 in_tot = -1;
 636                                 goto out;
 637                         }
 638                         if (in_size == 0)
 639                                 break;
 640
 641                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 642                         in_tot += in_size;
 643                         z.next_in = (unsigned char *)inbufp;
 644                         z.avail_in = in_size;
 645                 }
 646
 647                 error = deflate(&z, Z_NO_FLUSH);
 648                 if (error != Z_OK && error != Z_STREAM_END) {
 649                         maybe_warnx("deflate failed");
 650                         in_tot = -1;
 651                         goto out;
 652                 }
 653         }
 654
 655         /* clean up */
 656         for (;;) {
 657                 size_t len;
 658                 ssize_t w;
 659
 660                 error = deflate(&z, Z_FINISH);
 661                 if (error != Z_OK && error != Z_STREAM_END) {
 662                         maybe_warnx("deflate failed");
 663                         in_tot = -1;
 664                         goto out;
 665                 }
 666
 667                 len = (char *)z.next_out - outbufp;
 668
 669                 w = write(out, outbufp, len);
 670                 if (w == -1 || (size_t)w != len) {
 671                         maybe_warn("write");
 672                         out_tot = -1;
 673                         goto out;
 674                 }
 675                 out_tot += len;
 676                 z.next_out = (unsigned char *)outbufp;
 677                 z.avail_out = BUFLEN;
 678
 679                 if (error == Z_STREAM_END)
 680                         break;
 681         }
 682
 683         if (deflateEnd(&z) != Z_OK) {
 684                 maybe_warnx("deflateEnd failed");
 685                 in_tot = -1;
 686                 goto out;
 687         }
 688
 689         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 690                  (int)crc & 0xff,
 691                  (int)(crc >> 8) & 0xff,
 692                  (int)(crc >> 16) & 0xff,
 693                  (int)(crc >> 24) & 0xff,
 694                  (int)in_tot & 0xff,
 695                  (int)(in_tot >> 8) & 0xff,
 696                  (int)(in_tot >> 16) & 0xff,
 697                  (int)(in_tot >> 24) & 0xff);
 698         if (i != 8)
 699                 maybe_err("snprintf");
 700         if (write(out, outbufp, i) != i) {
 701                 maybe_warn("write");
 702                 in_tot = -1;
 703         } else
 704                 out_tot += i;
 705
 706 out:
 707         if (inbufp != NULL)
 708                 free(inbufp);
 709         if (outbufp != NULL)
 710                 free(outbufp);
 711         if (gsizep)
 712                 *gsizep = out_tot;
 713         return in_tot;
 714 }
 715
 716 /*
 717  * uncompress input to output then close the input.  return the
 718  * uncompressed size written, and put the compressed sized read
 719  * into `*gsizep'.
 720  */
 721 static off_t
 722 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 723               const char *filename)
 724 {
 725         z_stream z;
 726         char *outbufp, *inbufp;
 727         off_t out_tot = -1, in_tot = 0;
 728         uint32_t out_sub_tot = 0;
 729         enum {
 730                 GZSTATE_MAGIC0,
 731                 GZSTATE_MAGIC1,
 732                 GZSTATE_METHOD,
 733                 GZSTATE_FLAGS,
 734                 GZSTATE_SKIPPING,
 735                 GZSTATE_EXTRA,
 736                 GZSTATE_EXTRA2,
 737                 GZSTATE_EXTRA3,
 738                 GZSTATE_ORIGNAME,
 739                 GZSTATE_COMMENT,
 740                 GZSTATE_HEAD_CRC1,
 741                 GZSTATE_HEAD_CRC2,
 742                 GZSTATE_INIT,
 743                 GZSTATE_READ,
 744                 GZSTATE_CRC,
 745                 GZSTATE_LEN,
 746         } state = GZSTATE_MAGIC0;
 747         int flags = 0, skip_count = 0;
 748         int error = Z_STREAM_ERROR, done_reading = 0;
 749         uLong crc = 0;
 750         ssize_t wr;
 751         int needmore = 0;
 752
 753 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 754
 755         if ((outbufp = malloc(BUFLEN)) == NULL) {
 756                 maybe_err("malloc failed");
 757                 goto out2;
 758         }
 759         if ((inbufp = malloc(BUFLEN)) == NULL) {
 760                 maybe_err("malloc failed");
 761                 goto out1;
 762         }
 763
 764         memset(&z, 0, sizeof z);
 765         z.avail_in = prelen;
 766         z.next_in = (unsigned char *)pre;
 767         z.avail_out = BUFLEN;
 768         z.next_out = (unsigned char *)outbufp;
 769         z.zalloc = NULL;
 770         z.zfree = NULL;
 771         z.opaque = 0;
 772
 773         in_tot = prelen;
 774         out_tot = 0;
 775
 776         for (;;) {
 777                 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
 778                         ssize_t in_size;
 779
 780                         if (z.avail_in > 0) {
 781                                 memmove(inbufp, z.next_in, z.avail_in);
 782                         }
 783                         z.next_in = (unsigned char *)inbufp;
 784                         in_size = read(in, z.next_in + z.avail_in,
 785                             BUFLEN - z.avail_in);
 786
 787                         if (in_size == -1) {
 788                                 maybe_warn("failed to read stdin");
 789                                 goto stop_and_fail;
 790                         } else if (in_size == 0) {
 791                                 done_reading = 1;
 792                         }
 793
 794                         z.avail_in += in_size;
 795                         needmore = 0;
 796
 797                         in_tot += in_size;
 798                 }
 799                 if (z.avail_in == 0) {
 800                         if (done_reading && state != GZSTATE_MAGIC0) {
 801                                 maybe_warnx("%s: unexpected end of file",
 802                                             filename);
 803                                 goto stop_and_fail;
 804                         }
 805                         goto stop;
 806                 }
 807                 switch (state) {
 808                 case GZSTATE_MAGIC0:
 809                         if (*z.next_in != GZIP_MAGIC0) {
 810                                 if (in_tot > 0) {
 811                                         maybe_warnx("%s: trailing garbage "
 812                                                     "ignored", filename);
 813                                         exit_value = 2;
 814                                         goto stop;
 815                                 }
 816                                 maybe_warnx("input not gziped (MAGIC0)");
 817                                 goto stop_and_fail;
 818                         }
 819                         ADVANCE();
 820                         state++;
 821                         out_sub_tot = 0;
 822                         crc = crc32(0L, Z_NULL, 0);
 823                         break;
 824
 825                 case GZSTATE_MAGIC1:
 826                         if (*z.next_in != GZIP_MAGIC1 &&
 827                             *z.next_in != GZIP_OMAGIC1) {
 828                                 maybe_warnx("input not gziped (MAGIC1)");
 829                                 goto stop_and_fail;
 830                         }
 831                         ADVANCE();
 832                         state++;
 833                         break;
 834
 835                 case GZSTATE_METHOD:
 836                         if (*z.next_in != Z_DEFLATED) {
 837                                 maybe_warnx("unknown compression method");
 838                                 goto stop_and_fail;
 839                         }
 840                         ADVANCE();
 841                         state++;
 842                         break;
 843
 844                 case GZSTATE_FLAGS:
 845                         flags = *z.next_in;
 846                         ADVANCE();
 847                         skip_count = 6;
 848                         state++;
 849                         break;
 850
 851                 case GZSTATE_SKIPPING:
 852                         if (skip_count > 0) {
 853                                 skip_count--;
 854                                 ADVANCE();
 855                         } else
 856                                 state++;
 857                         break;
 858
 859                 case GZSTATE_EXTRA:
 860                         if ((flags & EXTRA_FIELD) == 0) {
 861                                 state = GZSTATE_ORIGNAME;
 862                                 break;
 863                         }
 864                         skip_count = *z.next_in;
 865                         ADVANCE();
 866                         state++;
 867                         break;
 868
 869                 case GZSTATE_EXTRA2:
 870                         skip_count |= ((*z.next_in) << 8);
 871                         ADVANCE();
 872                         state++;
 873                         break;
 874
 875                 case GZSTATE_EXTRA3:
 876                         if (skip_count > 0) {
 877                                 skip_count--;
 878                                 ADVANCE();
 879                         } else
 880                                 state++;
 881                         break;
 882
 883                 case GZSTATE_ORIGNAME:
 884                         if ((flags & ORIG_NAME) == 0) {
 885                                 state++;
 886                                 break;
 887                         }
 888                         if (*z.next_in == 0)
 889                                 state++;
 890                         ADVANCE();
 891                         break;
 892
 893                 case GZSTATE_COMMENT:
 894                         if ((flags & COMMENT) == 0) {
 895                                 state++;
 896                                 break;
 897                         }
 898                         if (*z.next_in == 0)
 899                                 state++;
 900                         ADVANCE();
 901                         break;
 902
 903                 case GZSTATE_HEAD_CRC1:
 904                         if (flags & HEAD_CRC)
 905                                 skip_count = 2;
 906                         else
 907                                 skip_count = 0;
 908                         state++;
 909                         break;
 910
 911                 case GZSTATE_HEAD_CRC2:
 912                         if (skip_count > 0) {
 913                                 skip_count--;
 914                                 ADVANCE();
 915                         } else
 916                                 state++;
 917                         break;
 918
 919                 case GZSTATE_INIT:
 920                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 921                                 maybe_warnx("failed to inflateInit");
 922                                 goto stop_and_fail;
 923                         }
 924                         state++;
 925                         break;
 926
 927                 case GZSTATE_READ:
 928                         error = inflate(&z, Z_FINISH);
 929                         switch (error) {
 930                         /* Z_BUF_ERROR goes with Z_FINISH... */
 931                         case Z_BUF_ERROR:
 932                                 if (z.avail_out > 0 && !done_reading)
 933                                         continue;
 934
 935                         case Z_STREAM_END:
 936                         case Z_OK:
 937                                 break;
 938
 939                         case Z_NEED_DICT:
 940                                 maybe_warnx("Z_NEED_DICT error");
 941                                 goto stop_and_fail;
 942                         case Z_DATA_ERROR:
 943                                 maybe_warnx("data stream error");
 944                                 goto stop_and_fail;
 945                         case Z_STREAM_ERROR:
 946                                 maybe_warnx("internal stream error");
 947                                 goto stop_and_fail;
 948                         case Z_MEM_ERROR:
 949                                 maybe_warnx("memory allocation error");
 950                                 goto stop_and_fail;
 951
 952                         default:
 953                                 maybe_warn("unknown error from inflate(): %d",
 954                                     error);
 955                         }
 956                         wr = BUFLEN - z.avail_out;
 957
 958                         if (wr != 0) {
 959                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 960                                 if (
 961 #ifndef SMALL
 962                                     /* don't write anything with -t */
 963                                     tflag == 0 &&
 964 #endif
 965                                     write(out, outbufp, wr) != wr) {
 966                                         maybe_warn("error writing to output");
 967                                         goto stop_and_fail;
 968                                 }
 969
 970                                 out_tot += wr;
 971                                 out_sub_tot += wr;
 972                         }
 973
 974                         if (error == Z_STREAM_END) {
 975                                 inflateEnd(&z);
 976                                 state++;
 977                         }
 978
 979                         z.next_out = (unsigned char *)outbufp;
 980                         z.avail_out = BUFLEN;
 981
 982                         break;
 983                 case GZSTATE_CRC:
 984                         {
 985                                 uLong origcrc;
 986
 987                                 if (z.avail_in < 4) {
 988                                         if (!done_reading) {
 989                                                 needmore = 1;
 990                                                 continue;
 991                                         }
 992                                         maybe_warnx("truncated input");
 993                                         goto stop_and_fail;
 994                                 }
 995                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
 996                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 997                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 998                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 999                                 if (origcrc != crc) {
1000                                         maybe_warnx("invalid compressed"
1001                                              " data--crc error");
1002                                         goto stop_and_fail;
1003                                 }
1004                         }
1005
1006                         z.avail_in -= 4;
1007                         z.next_in += 4;
1008
1009                         if (!z.avail_in && done_reading) {
1010                                 goto stop;
1011                         }
1012                         state++;
1013                         break;
1014                 case GZSTATE_LEN:
1015                         {
1016                                 uLong origlen;
1017
1018                                 if (z.avail_in < 4) {
1019                                         if (!done_reading) {
1020                                                 needmore = 1;
1021                                                 continue;
1022                                         }
1023                                         maybe_warnx("truncated input");
1024                                         goto stop_and_fail;
1025                                 }
1026                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
1027                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
1028                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
1029                                         ((unsigned)z.next_in[3] & 0xff) << 24;
1030
1031                                 if (origlen != out_sub_tot) {
1032                                         maybe_warnx("invalid compressed"
1033                                              " data--length error");
1034                                         goto stop_and_fail;
1035                                 }
1036                         }
1037
1038                         z.avail_in -= 4;
1039                         z.next_in += 4;
1040
1041                         if (error < 0) {
1042                                 maybe_warnx("decompression error");
1043                                 goto stop_and_fail;
1044                         }
1045                         state = GZSTATE_MAGIC0;
1046                         break;
1047                 }
1048                 continue;
1049 stop_and_fail:
1050                 out_tot = -1;
1051 stop:
1052                 break;
1053         }
1054         if (state > GZSTATE_INIT)
1055                 inflateEnd(&z);
1056
1057         free(inbufp);
1058 out1:
1059         free(outbufp);
1060 out2:
1061         if (gsizep)
1062                 *gsizep = in_tot;
1063         return (out_tot);
1064 }
1065
1066 #ifndef SMALL
1067 /*
1068  * set the owner, mode, flags & utimes using the given file descriptor.
1069  * file is only used in possible warning messages.
1070  */
1071 static void
1072 copymodes(int fd, const struct stat *sbp, const char *file)
1073 {
1074         struct timeval times[2];
1075         struct stat sb;
1076
1077         /*
1078          * If we have no info on the input, give this file some
1079          * default values and return..
1080          */
1081         if (sbp == NULL) {
1082                 mode_t mask = umask(022);
1083
1084                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1085                 (void)umask(mask);
1086                 return;
1087         }
1088         sb = *sbp;
1089
1090         /* if the chown fails, remove set-id bits as-per compress(1) */
1091         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1092                 if (errno != EPERM)
1093                         maybe_warn("couldn't fchown: %s", file);
1094                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1095         }
1096
1097         /* we only allow set-id and the 9 normal permission bits */
1098         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1099         if (fchmod(fd, sb.st_mode) < 0)
1100                 maybe_warn("couldn't fchmod: %s", file);
1101
1102         TIMESPEC_TO_TIMEVAL(&times[0], &sb.st_atim);
1103         TIMESPEC_TO_TIMEVAL(&times[1], &sb.st_mtim);
1104         if (futimes(fd, times) < 0)
1105                 maybe_warn("couldn't utimes: %s", file);
1106
1107         /* only try flags if they exist already */
1108         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1109                 maybe_warn("couldn't fchflags: %s", file);
1110 }
1111 #endif
1112
1113 /* what sort of file is this? */
1114 static enum filetype
1115 file_gettype(u_char *buf)
1116 {
1117
1118         if (buf[0] == GZIP_MAGIC0 &&
1119             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1120                 return FT_GZIP;
1121         else
1122 #ifndef NO_BZIP2_SUPPORT
1123         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1124             buf[3] >= '0' && buf[3] <= '9')
1125                 return FT_BZIP2;
1126         else
1127 #endif
1128 #ifndef NO_COMPRESS_SUPPORT
1129         if (memcmp(buf, Z_MAGIC, 2) == 0)
1130                 return FT_Z;
1131         else
1132 #endif
1133 #ifndef NO_PACK_SUPPORT
1134         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1135                 return FT_PACK;
1136         else
1137 #endif
1138 #ifndef NO_XZ_SUPPORT
1139         if (memcmp(buf, XZ_MAGIC, 4) == 0)      /* XXX: We only have 4 bytes */
1140                 return FT_XZ;
1141         else
1142 #endif
1143                 return FT_UNKNOWN;
1144 }
1145
1146 #ifndef SMALL
1147 /* check the outfile is OK. */
1148 static int
1149 check_outfile(const char *outfile)
1150 {
1151         struct stat sb;
1152         int ok = 1;
1153
1154         if (lflag == 0 && stat(outfile, &sb) == 0) {
1155                 if (fflag)
1156                         unlink(outfile);
1157                 else if (isatty(STDIN_FILENO)) {
1158                         char ans[10] = { 'n', '\0' };   /* default */
1159
1160                         fprintf(stderr, "%s already exists -- do you wish to "
1161                                         "overwrite (y or n)? " , outfile);
1162                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1163                         if (ans[0] != 'y' && ans[0] != 'Y') {
1164                                 fprintf(stderr, "\tnot overwriting\n");
1165                                 ok = 0;
1166                         } else
1167                                 unlink(outfile);
1168                 } else {
1169                         maybe_warnx("%s already exists -- skipping", outfile);
1170                         ok = 0;
1171                 }
1172         }
1173         return ok;
1174 }
1175
1176 static void
1177 unlink_input(const char *file, const struct stat *sb)
1178 {
1179         struct stat nsb;
1180
1181         if (kflag)
1182                 return;
1183         if (stat(file, &nsb) != 0)
1184                 /* Must be gone already */
1185                 return;
1186         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1187                 /* Definitely a different file */
1188                 return;
1189         unlink(file);
1190 }
1191
1192 static void
1193 sigint_handler(int signo __unused)
1194 {
1195
1196         if (remove_file != NULL)
1197                 unlink(remove_file);
1198         _exit(2);
1199 }
1200 #endif
1201
1202 static const suffixes_t *
1203 check_suffix(char *file, int xlate)
1204 {
1205         const suffixes_t *s;
1206         int len = strlen(file);
1207         char *sp;
1208
1209         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1210                 /* if it doesn't fit in "a.suf", don't bother */
1211                 if (s->ziplen >= len)
1212                         continue;
1213                 sp = file + len - s->ziplen;
1214                 if (strcmp(s->zipped, sp) != 0)
1215                         continue;
1216                 if (xlate)
1217                         strcpy(sp, s->normal);
1218                 return s;
1219         }
1220         return NULL;
1221 }
1222
1223 /*
1224  * compress the given file: create a corresponding .gz file and remove the
1225  * original.
1226  */
1227 static off_t
1228 file_compress(char *file, char *outfile, size_t outsize)
1229 {
1230         int in;
1231         int out;
1232         off_t size, insize;
1233 #ifndef SMALL
1234         struct stat isb, osb;
1235         const suffixes_t *suff;
1236 #endif
1237
1238         in = open(file, O_RDONLY);
1239         if (in == -1) {
1240                 maybe_warn("can't open %s", file);
1241                 return (-1);
1242         }
1243
1244 #ifndef SMALL
1245         if (fstat(in, &isb) != 0) {
1246                 maybe_warn("couldn't stat: %s", file);
1247                 close(in);
1248                 return (-1);
1249         }
1250 #endif
1251
1252         if (cflag == 0) {
1253 #ifndef SMALL
1254                 if (isb.st_nlink > 1 && fflag == 0) {
1255                         maybe_warnx("%s has %d other link%s -- skipping",
1256                             file, isb.st_nlink - 1,
1257                             (isb.st_nlink - 1) == 1 ? "" : "s");
1258                         close(in);
1259                         return (-1);
1260                 }
1261
1262                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1263                     suff->zipped[0] != 0) {
1264                         maybe_warnx("%s already has %s suffix -- unchanged",
1265                             file, suff->zipped);
1266                         close(in);
1267                         return (-1);
1268                 }
1269 #endif
1270
1271                 /* Add (usually) .gz to filename */
1272                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1273                     file, suffixes[0].zipped) >= outsize)
1274                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1275                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1276
1277 #ifndef SMALL
1278                 if (check_outfile(outfile) == 0) {
1279                         close(in);
1280                         return (-1);
1281                 }
1282 #endif
1283         }
1284
1285         if (cflag == 0) {
1286                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1287                 if (out == -1) {
1288                         maybe_warn("could not create output: %s", outfile);
1289                         fclose(stdin);
1290                         return (-1);
1291                 }
1292 #ifndef SMALL
1293                 remove_file = outfile;
1294 #endif
1295         } else
1296                 out = STDOUT_FILENO;
1297
1298         insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1299
1300         (void)close(in);
1301
1302         /*
1303          * If there was an error, insize will be -1.
1304          * If we compressed to stdout, just return the size.
1305          * Otherwise stat the file and check it is the correct size.
1306          * We only blow away the file if we can stat the output and it
1307          * has the expected size.
1308          */
1309         if (cflag != 0)
1310                 return (insize == -1 ? -1 : size);
1311
1312 #ifndef SMALL
1313         if (fstat(out, &osb) != 0) {
1314                 maybe_warn("couldn't stat: %s", outfile);
1315                 goto bad_outfile;
1316         }
1317
1318         if (osb.st_size != size) {
1319                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1320                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1321                 goto bad_outfile;
1322         }
1323
1324         copymodes(out, &isb, outfile);
1325         remove_file = NULL;
1326 #endif
1327         if (close(out) == -1)
1328                 maybe_warn("couldn't close output");
1329
1330         /* output is good, ok to delete input */
1331         unlink_input(file, &isb);
1332         return (size);
1333
1334 #ifndef SMALL
1335     bad_outfile:
1336         if (close(out) == -1)
1337                 maybe_warn("couldn't close output");
1338
1339         maybe_warnx("leaving original %s", file);
1340         unlink(outfile);
1341         return (size);
1342 #endif
1343 }
1344
1345 /* uncompress the given file and remove the original */
1346 static off_t
1347 file_uncompress(char *file, char *outfile, size_t outsize)
1348 {
1349         struct stat isb, osb;
1350         off_t size;
1351         ssize_t rbytes;
1352         unsigned char header1[4];
1353         enum filetype method;
1354         int fd, ofd, zfd = -1;
1355 #ifndef SMALL
1356         ssize_t rv;
1357         time_t timestamp = 0;
1358         char name[PATH_MAX + 1];
1359 #endif
1360
1361         /* gather the old name info */
1362
1363         fd = open(file, O_RDONLY);
1364         if (fd < 0) {
1365                 maybe_warn("can't open %s", file);
1366                 goto lose;
1367         }
1368
1369         strlcpy(outfile, file, outsize);
1370         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1371                 maybe_warnx("%s: unknown suffix -- ignored", file);
1372                 goto lose;
1373         }
1374
1375         rbytes = read(fd, header1, sizeof header1);
1376         if (rbytes != sizeof header1) {
1377                 /* we don't want to fail here. */
1378 #ifndef SMALL
1379                 if (fflag)
1380                         goto lose;
1381 #endif
1382                 if (rbytes == -1)
1383                         maybe_warn("can't read %s", file);
1384                 else
1385                         goto unexpected_EOF;
1386                 goto lose;
1387         }
1388
1389         method = file_gettype(header1);
1390 #ifndef SMALL
1391         if (fflag == 0 && method == FT_UNKNOWN) {
1392                 maybe_warnx("%s: not in gzip format", file);
1393                 goto lose;
1394         }
1395
1396 #endif
1397
1398 #ifndef SMALL
1399         if (method == FT_GZIP && Nflag) {
1400                 unsigned char ts[4];    /* timestamp */
1401
1402                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1403                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1404                         goto unexpected_EOF;
1405                 if (rv == -1) {
1406                         if (!fflag)
1407                                 maybe_warn("can't read %s", file);
1408                         goto lose;
1409                 }
1410                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1411
1412                 if (header1[3] & ORIG_NAME) {
1413                         rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1414                         if (rbytes < 0) {
1415                                 maybe_warn("can't read %s", file);
1416                                 goto lose;
1417                         }
1418                         if (name[0] != '\0') {
1419                                 char *dp, *nf;
1420
1421                                 /* Make sure that name is NUL-terminated */
1422                                 name[rbytes] = '\0';
1423
1424                                 /* strip saved directory name */
1425                                 nf = strrchr(name, '/');
1426                                 if (nf == NULL)
1427                                         nf = name;
1428                                 else
1429                                         nf++;
1430
1431                                 /* preserve original directory name */
1432                                 dp = strrchr(file, '/');
1433                                 if (dp == NULL)
1434                                         dp = file;
1435                                 else
1436                                         dp++;
1437                                 snprintf(outfile, outsize, "%.*s%.*s",
1438                                                 (int) (dp - file),
1439                                                 file, (int) rbytes, nf);
1440                         }
1441                 }
1442         }
1443 #endif
1444         lseek(fd, 0, SEEK_SET);
1445
1446         if (cflag == 0 || lflag) {
1447                 if (fstat(fd, &isb) != 0)
1448                         goto lose;
1449 #ifndef SMALL
1450                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1451                         maybe_warnx("%s has %d other links -- skipping",
1452                             file, isb.st_nlink - 1);
1453                         goto lose;
1454                 }
1455                 if (nflag == 0 && timestamp)
1456                         isb.st_mtime = timestamp;
1457                 if (check_outfile(outfile) == 0)
1458                         goto lose;
1459 #endif
1460         }
1461
1462         if (cflag == 0 && lflag == 0) {
1463                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1464                 if (zfd == STDOUT_FILENO) {
1465                         /* We won't close STDOUT_FILENO later... */
1466                         zfd = dup(zfd);
1467                         close(STDOUT_FILENO);
1468                 }
1469                 if (zfd == -1) {
1470                         maybe_warn("can't open %s", outfile);
1471                         goto lose;
1472                 }
1473 #ifndef SMALL
1474                 remove_file = outfile;
1475 #endif
1476         } else
1477                 zfd = STDOUT_FILENO;
1478
1479         switch (method) {
1480 #ifndef NO_BZIP2_SUPPORT
1481         case FT_BZIP2:
1482                 /* XXX */
1483                 if (lflag) {
1484                         maybe_warnx("no -l with bzip2 files");
1485                         goto lose;
1486                 }
1487
1488                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1489                 break;
1490 #endif
1491
1492 #ifndef NO_COMPRESS_SUPPORT
1493         case FT_Z: {
1494                 FILE *in, *out;
1495
1496                 /* XXX */
1497                 if (lflag) {
1498                         maybe_warnx("no -l with Lempel-Ziv files");
1499                         goto lose;
1500                 }
1501
1502                 if ((in = zdopen(fd)) == NULL) {
1503                         maybe_warn("zdopen for read: %s", file);
1504                         goto lose;
1505                 }
1506
1507                 out = fdopen(dup(zfd), "w");
1508                 if (out == NULL) {
1509                         maybe_warn("fdopen for write: %s", outfile);
1510                         fclose(in);
1511                         goto lose;
1512                 }
1513
1514                 size = zuncompress(in, out, NULL, 0, NULL);
1515                 /* need to fclose() if ferror() is true... */
1516                 if (ferror(in) | fclose(in)) {
1517                         maybe_warn("failed infile fclose");
1518                         unlink(outfile);
1519                         (void)fclose(out);
1520                 }
1521                 if (fclose(out) != 0) {
1522                         maybe_warn("failed outfile fclose");
1523                         unlink(outfile);
1524                         goto lose;
1525                 }
1526                 break;
1527         }
1528 #endif
1529
1530 #ifndef NO_PACK_SUPPORT
1531         case FT_PACK:
1532                 if (lflag) {
1533                         maybe_warnx("no -l with packed files");
1534                         goto lose;
1535                 }
1536
1537                 size = unpack(fd, zfd, NULL, 0, NULL);
1538                 break;
1539 #endif
1540
1541 #ifndef NO_XZ_SUPPORT
1542         case FT_XZ:
1543                 if (lflag) {
1544                         maybe_warnx("no -l with xz files");
1545                         goto lose;
1546                 }
1547
1548                 size = unxz(fd, zfd, NULL, 0, NULL);
1549                 break;
1550 #endif
1551
1552 #ifndef SMALL
1553         case FT_UNKNOWN:
1554                 if (lflag) {
1555                         maybe_warnx("no -l for unknown filetypes");
1556                         goto lose;
1557                 }
1558                 size = cat_fd(NULL, 0, NULL, fd);
1559                 break;
1560 #endif
1561         default:
1562                 if (lflag) {
1563                         print_list(fd, isb.st_size, outfile, isb.st_mtime);
1564                         close(fd);
1565                         return -1;      /* XXX */
1566                 }
1567
1568                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1569                 break;
1570         }
1571
1572         if (close(fd) != 0)
1573                 maybe_warn("couldn't close input");
1574         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1575                 maybe_warn("couldn't close output");
1576
1577         if (size == -1) {
1578                 if (cflag == 0)
1579                         unlink(outfile);
1580                 maybe_warnx("%s: uncompress failed", file);
1581                 return -1;
1582         }
1583
1584         /* if testing, or we uncompressed to stdout, this is all we need */
1585 #ifndef SMALL
1586         if (tflag)
1587                 return size;
1588 #endif
1589         /* if we are uncompressing to stdin, don't remove the file. */
1590         if (cflag)
1591                 return size;
1592
1593         /*
1594          * if we create a file...
1595          */
1596         /*
1597          * if we can't stat the file don't remove the file.
1598          */
1599
1600         ofd = open(outfile, O_RDWR, 0);
1601         if (ofd == -1) {
1602                 maybe_warn("couldn't open (leaving original): %s",
1603                            outfile);
1604                 return -1;
1605         }
1606         if (fstat(ofd, &osb) != 0) {
1607                 maybe_warn("couldn't stat (leaving original): %s",
1608                            outfile);
1609                 close(ofd);
1610                 return -1;
1611         }
1612         if (osb.st_size != size) {
1613                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1614                     (uintmax_t)size, (uintmax_t)osb.st_size);
1615                 close(ofd);
1616                 unlink(outfile);
1617                 return -1;
1618         }
1619 #ifndef SMALL
1620         copymodes(ofd, &isb, outfile);
1621         remove_file = NULL;
1622 #endif
1623         close(ofd);
1624         unlink_input(file, &isb);
1625         return size;
1626
1627     unexpected_EOF:
1628         maybe_warnx("%s: unexpected end of file", file);
1629     lose:
1630         if (fd != -1)
1631                 close(fd);
1632         if (zfd != -1 && zfd != STDOUT_FILENO)
1633                 close(fd);
1634         return -1;
1635 }
1636
1637 #ifndef SMALL
1638 static off_t
1639 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1640 {
1641         char buf[BUFLEN];
1642         off_t in_tot;
1643         ssize_t w;
1644
1645         in_tot = count;
1646         w = write(STDOUT_FILENO, prepend, count);
1647         if (w == -1 || (size_t)w != count) {
1648                 maybe_warn("write to stdout");
1649                 return -1;
1650         }
1651         for (;;) {
1652                 ssize_t rv;
1653
1654                 rv = read(fd, buf, sizeof buf);
1655                 if (rv == 0)
1656                         break;
1657                 if (rv < 0) {
1658                         maybe_warn("read from fd %d", fd);
1659                         break;
1660                 }
1661
1662                 if (write(STDOUT_FILENO, buf, rv) != rv) {
1663                         maybe_warn("write to stdout");
1664                         break;
1665                 }
1666                 in_tot += rv;
1667         }
1668
1669         if (gsizep)
1670                 *gsizep = in_tot;
1671         return (in_tot);
1672 }
1673 #endif
1674
1675 static void
1676 handle_stdin(void)
1677 {
1678         unsigned char header1[4];
1679         off_t usize, gsize;
1680         enum filetype method;
1681         ssize_t bytes_read;
1682 #ifndef NO_COMPRESS_SUPPORT
1683         FILE *in;
1684 #endif
1685
1686 #ifndef SMALL
1687         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1688                 maybe_warnx("standard input is a terminal -- ignoring");
1689                 return;
1690         }
1691 #endif
1692
1693         if (lflag) {
1694                 struct stat isb;
1695
1696                 /* XXX could read the whole file, etc. */
1697                 if (fstat(STDIN_FILENO, &isb) < 0) {
1698                         maybe_warn("fstat");
1699                         return;
1700                 }
1701                 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1702                 return;
1703         }
1704
1705         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1706         if (bytes_read == -1) {
1707                 maybe_warn("can't read stdin");
1708                 return;
1709         } else if (bytes_read != sizeof(header1)) {
1710                 maybe_warnx("(stdin): unexpected end of file");
1711                 return;
1712         }
1713
1714         method = file_gettype(header1);
1715         switch (method) {
1716         default:
1717 #ifndef SMALL
1718                 if (fflag == 0) {
1719                         maybe_warnx("unknown compression format");
1720                         return;
1721                 }
1722                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1723                 break;
1724 #endif
1725         case FT_GZIP:
1726                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1727                               (char *)header1, sizeof header1, &gsize, "(stdin)");
1728                 break;
1729 #ifndef NO_BZIP2_SUPPORT
1730         case FT_BZIP2:
1731                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1732                                 (char *)header1, sizeof header1, &gsize);
1733                 break;
1734 #endif
1735 #ifndef NO_COMPRESS_SUPPORT
1736         case FT_Z:
1737                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1738                         maybe_warnx("zopen of stdin");
1739                         return;
1740                 }
1741
1742                 usize = zuncompress(in, stdout, (char *)header1,
1743                     sizeof header1, &gsize);
1744                 fclose(in);
1745                 break;
1746 #endif
1747 #ifndef NO_PACK_SUPPORT
1748         case FT_PACK:
1749                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1750                                (char *)header1, sizeof header1, &gsize);
1751                 break;
1752 #endif
1753 #ifndef NO_XZ_SUPPORT
1754         case FT_XZ:
1755                 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1756                              (char *)header1, sizeof header1, &gsize);
1757                 break;
1758 #endif
1759         }
1760
1761 #ifndef SMALL
1762         if (vflag && !tflag && usize != -1 && gsize != -1)
1763                 print_verbage(NULL, NULL, usize, gsize);
1764         if (vflag && tflag)
1765                 print_test("(stdin)", usize != -1);
1766 #endif
1767
1768 }
1769
1770 static void
1771 handle_stdout(void)
1772 {
1773         off_t gsize, usize;
1774         struct stat sb;
1775         time_t systime;
1776         uint32_t mtime;
1777         int ret;
1778
1779 #ifndef SMALL
1780         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1781                 maybe_warnx("standard output is a terminal -- ignoring");
1782                 return;
1783         }
1784 #endif
1785         /* If stdin is a file use its mtime, otherwise use current time */
1786         ret = fstat(STDIN_FILENO, &sb);
1787
1788 #ifndef SMALL
1789         if (ret < 0) {
1790                 maybe_warn("Can't stat stdin");
1791                 return;
1792         }
1793 #endif
1794
1795         if (S_ISREG(sb.st_mode))
1796                 mtime = (uint32_t)sb.st_mtime;
1797         else {
1798                 systime = time(NULL);
1799 #ifndef SMALL
1800                 if (systime == -1) {
1801                         maybe_warn("time");
1802                         return;
1803                 }
1804 #endif
1805                 mtime = (uint32_t)systime;
1806         }
1807
1808         usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1809 #ifndef SMALL
1810         if (vflag && !tflag && usize != -1 && gsize != -1)
1811                 print_verbage(NULL, NULL, usize, gsize);
1812 #endif
1813 }
1814
1815 /* do what is asked for, for the path name */
1816 static void
1817 handle_pathname(char *path)
1818 {
1819         char *opath = path, *s = NULL;
1820         ssize_t len;
1821         int slen;
1822         struct stat sb;
1823
1824         /* check for stdout/stdin */
1825         if (path[0] == '-' && path[1] == '\0') {
1826                 if (dflag)
1827                         handle_stdin();
1828                 else
1829                         handle_stdout();
1830                 return;
1831         }
1832
1833 retry:
1834         if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1835             lstat(path, &sb) != 0)) {
1836                 /* lets try <path>.gz if we're decompressing */
1837                 if (dflag && s == NULL && errno == ENOENT) {
1838                         len = strlen(path);
1839                         slen = suffixes[0].ziplen;
1840                         s = malloc(len + slen + 1);
1841                         if (s == NULL)
1842                                 maybe_err("malloc");
1843                         memcpy(s, path, len);
1844                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1845                         path = s;
1846                         goto retry;
1847                 }
1848                 maybe_warn("can't stat: %s", opath);
1849                 goto out;
1850         }
1851
1852         if (S_ISDIR(sb.st_mode)) {
1853 #ifndef SMALL
1854                 if (rflag)
1855                         handle_dir(path);
1856                 else
1857 #endif
1858                         maybe_warnx("%s is a directory", path);
1859                 goto out;
1860         }
1861
1862         if (S_ISREG(sb.st_mode))
1863                 handle_file(path, &sb);
1864         else
1865                 maybe_warnx("%s is not a regular file", path);
1866
1867 out:
1868         if (s)
1869                 free(s);
1870 }
1871
1872 /* compress/decompress a file */
1873 static void
1874 handle_file(char *file, struct stat *sbp)
1875 {
1876         off_t usize, gsize;
1877         char    outfile[PATH_MAX];
1878
1879         infile = file;
1880         if (dflag) {
1881                 usize = file_uncompress(file, outfile, sizeof(outfile));
1882 #ifndef SMALL
1883                 if (vflag && tflag)
1884                         print_test(file, usize != -1);
1885 #endif
1886                 if (usize == -1)
1887                         return;
1888                 gsize = sbp->st_size;
1889         } else {
1890                 gsize = file_compress(file, outfile, sizeof(outfile));
1891                 if (gsize == -1)
1892                         return;
1893                 usize = sbp->st_size;
1894         }
1895
1896
1897 #ifndef SMALL
1898         if (vflag && !tflag)
1899                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1900 #endif
1901 }
1902
1903 #ifndef SMALL
1904 /* this is used with -r to recursively descend directories */
1905 static void
1906 handle_dir(char *dir)
1907 {
1908         char *path_argv[2];
1909         FTS *fts;
1910         FTSENT *entry;
1911
1912         path_argv[0] = dir;
1913         path_argv[1] = 0;
1914         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1915         if (fts == NULL) {
1916                 warn("couldn't fts_open %s", dir);
1917                 return;
1918         }
1919
1920         while ((entry = fts_read(fts))) {
1921                 switch(entry->fts_info) {
1922                 case FTS_D:
1923                 case FTS_DP:
1924                         continue;
1925
1926                 case FTS_DNR:
1927                 case FTS_ERR:
1928                 case FTS_NS:
1929                         maybe_warn("%s", entry->fts_path);
1930                         continue;
1931                 case FTS_F:
1932                         handle_file(entry->fts_path, entry->fts_statp);
1933                 }
1934         }
1935         (void)fts_close(fts);
1936 }
1937 #endif
1938
1939 /* print a ratio - size reduction as a fraction of uncompressed size */
1940 static void
1941 print_ratio(off_t in, off_t out, FILE *where)
1942 {
1943         int percent10;  /* 10 * percent */
1944         off_t diff;
1945         char buff[8];
1946         int len;
1947
1948         diff = in - out/2;
1949         if (diff <= 0)
1950                 /*
1951                  * Output is more than double size of input! print -99.9%
1952                  * Quite possibly we've failed to get the original size.
1953                  */
1954                 percent10 = -999;
1955         else {
1956                 /*
1957                  * We only need 12 bits of result from the final division,
1958                  * so reduce the values until a 32bit division will suffice.
1959                  */
1960                 while (in > 0x100000) {
1961                         diff >>= 1;
1962                         in >>= 1;
1963                 }
1964                 if (in != 0)
1965                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1966                 else
1967                         percent10 = 0;
1968         }
1969
1970         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1971         /* Move the '.' to before the last digit */
1972         buff[len - 1] = buff[len - 2];
1973         buff[len - 2] = '.';
1974         fprintf(where, "%5s%%", buff);
1975 }
1976
1977 #ifndef SMALL
1978 /* print compression statistics, and the new name (if there is one!) */
1979 static void
1980 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1981 {
1982         if (file)
1983                 fprintf(stderr, "%s:%s  ", file,
1984                     strlen(file) < 7 ? "\t\t" : "\t");
1985         print_ratio(usize, gsize, stderr);
1986         if (nfile)
1987                 fprintf(stderr, " -- replaced with %s", nfile);
1988         fprintf(stderr, "\n");
1989         fflush(stderr);
1990 }
1991
1992 /* print test results */
1993 static void
1994 print_test(const char *file, int ok)
1995 {
1996
1997         if (exit_value == 0 && ok == 0)
1998                 exit_value = 1;
1999         fprintf(stderr, "%s:%s  %s\n", file,
2000             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2001         fflush(stderr);
2002 }
2003 #endif
2004
2005 /* print a file's info ala --list */
2006 /* eg:
2007   compressed uncompressed  ratio uncompressed_name
2008       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2009 */
2010 static void
2011 print_list(int fd, off_t out, const char *outfile, time_t ts)
2012 {
2013         static int first = 1;
2014 #ifndef SMALL
2015         static off_t in_tot, out_tot;
2016         uint32_t crc = 0;
2017 #endif
2018         off_t in = 0, rv;
2019
2020         if (first) {
2021 #ifndef SMALL
2022                 if (vflag)
2023                         printf("method  crc     date  time  ");
2024 #endif
2025                 if (qflag == 0)
2026                         printf("  compressed uncompressed  "
2027                                "ratio uncompressed_name\n");
2028         }
2029         first = 0;
2030
2031         /* print totals? */
2032 #ifndef SMALL
2033         if (fd == -1) {
2034                 in = in_tot;
2035                 out = out_tot;
2036         } else
2037 #endif
2038         {
2039                 /* read the last 4 bytes - this is the uncompressed size */
2040                 rv = lseek(fd, (off_t)(-8), SEEK_END);
2041                 if (rv != -1) {
2042                         unsigned char buf[8];
2043                         uint32_t usize;
2044
2045                         rv = read(fd, (char *)buf, sizeof(buf));
2046                         if (rv == -1)
2047                                 maybe_warn("read of uncompressed size");
2048                         else if (rv != sizeof(buf))
2049                                 maybe_warnx("read of uncompressed size");
2050
2051                         else {
2052                                 usize = buf[4] | buf[5] << 8 |
2053                                         buf[6] << 16 | buf[7] << 24;
2054                                 in = (off_t)usize;
2055 #ifndef SMALL
2056                                 crc = buf[0] | buf[1] << 8 |
2057                                       buf[2] << 16 | buf[3] << 24;
2058 #endif
2059                         }
2060                 }
2061         }
2062
2063 #ifndef SMALL
2064         if (vflag && fd == -1)
2065                 printf("                            ");
2066         else if (vflag) {
2067                 char *date = ctime(&ts);
2068
2069                 /* skip the day, 1/100th second, and year */
2070                 date += 4;
2071                 date[12] = 0;
2072                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2073         }
2074         in_tot += in;
2075         out_tot += out;
2076 #else
2077         (void)&ts;      /* XXX */
2078 #endif
2079         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2080         print_ratio(in, out, stdout);
2081         printf(" %s\n", outfile);
2082 }
2083
2084 /* display the usage of NetBSD gzip */
2085 static void
2086 usage(void)
2087 {
2088
2089         fprintf(stderr, "%s\n", gzip_version);
2090         fprintf(stderr,
2091 #ifdef SMALL
2092     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2093 #else
2094     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2095     " -1 --fast            fastest (worst) compression\n"
2096     " -2 .. -8             set compression level\n"
2097     " -9 --best            best (slowest) compression\n"
2098     " -c --stdout          write to stdout, keep original files\n"
2099     "    --to-stdout\n"
2100     " -d --decompress      uncompress files\n"
2101     "    --uncompress\n"
2102     " -f --force           force overwriting & compress links\n"
2103     " -h --help            display this help\n"
2104     " -k --keep            don't delete input files during operation\n"
2105     " -l --list            list compressed file contents\n"
2106     " -N --name            save or restore original file name and time stamp\n"
2107     " -n --no-name         don't save original file name or time stamp\n"
2108     " -q --quiet           output no warnings\n"
2109     " -r --recursive       recursively compress files in directories\n"
2110     " -S .suf              use suffix .suf instead of .gz\n"
2111     "    --suffix .suf\n"
2112     " -t --test            test compressed file\n"
2113     " -V --version         display program version\n"
2114     " -v --verbose         print extra statistics\n",
2115 #endif
2116             getprogname());
2117         exit(0);
2118 }
2119
2120 #ifndef SMALL
2121 /* display the license information of FreeBSD gzip */
2122 static void
2123 display_license(void)
2124 {
2125
2126         fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2127         fprintf(stderr, "%s\n", gzip_copyright);
2128         exit(0);
2129 }
2130 #endif
2131
2132 /* display the version of NetBSD gzip */
2133 static void
2134 display_version(void)
2135 {
2136
2137         fprintf(stderr, "%s\n", gzip_version);
2138         exit(0);
2139 }
2140
2141 #ifndef NO_BZIP2_SUPPORT
2142 #include "unbzip2.c"
2143 #endif
2144 #ifndef NO_COMPRESS_SUPPORT
2145 #include "zuncompress.c"
2146 #endif
2147 #ifndef NO_PACK_SUPPORT
2148 #include "unpack.c"
2149 #endif
2150 #ifndef NO_XZ_SUPPORT
2151 #include "unxz.c"
2152 #endif
2153
2154 static ssize_t
2155 read_retry(int fd, void *buf, size_t sz)
2156 {
2157         char *cp = buf;
2158         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2159
2160         while (left > 0) {
2161                 ssize_t ret;
2162
2163                 ret = read(fd, cp, left);
2164                 if (ret == -1) {
2165                         return ret;
2166                 } else if (ret == 0) {
2167                         break; /* EOF */
2168                 }
2169                 cp += ret;
2170                 left -= ret;
2171         }
2172
2173         return sz - left;
2174 }