usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.116 2018/10/27 11:39:12 skrll 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 #ifndef NO_LZ_SUPPORT
  88         FT_LZ,
  89 #endif
  90         FT_LAST,
  91         FT_UNKNOWN
  92 };
  93
  94 #ifndef NO_BZIP2_SUPPORT
  95 #include <bzlib.h>
  96
  97 #define BZ2_SUFFIX      ".bz2"
  98 #define BZIP2_MAGIC     "BZh"
  99 #endif
 100
 101 #ifndef NO_COMPRESS_SUPPORT
 102 #define Z_SUFFIX        ".Z"
 103 #define Z_MAGIC         "\037\235"
 104 #endif
 105
 106 #ifndef NO_PACK_SUPPORT
 107 #define PACK_MAGIC      "\037\036"
 108 #endif
 109
 110 #ifndef NO_XZ_SUPPORT
 111 #include <lzma.h>
 112 #define XZ_SUFFIX       ".xz"
 113 #define XZ_MAGIC        "\3757zXZ"
 114 #endif
 115
 116 #ifndef NO_LZ_SUPPORT
 117 #define LZ_SUFFIX       ".lz"
 118 #define LZ_MAGIC        "LZIP"
 119 #endif
 120
 121 #define GZ_SUFFIX       ".gz"
 122
 123 #define BUFLEN          (64 * 1024)
 124
 125 #define GZIP_MAGIC0     0x1F
 126 #define GZIP_MAGIC1     0x8B
 127 #define GZIP_OMAGIC1    0x9E
 128
 129 #define GZIP_TIMESTAMP  (off_t)4
 130 #define GZIP_ORIGNAME   (off_t)10
 131
 132 #define HEAD_CRC        0x02
 133 #define EXTRA_FIELD     0x04
 134 #define ORIG_NAME       0x08
 135 #define COMMENT         0x10
 136
 137 #define OS_CODE         3       /* Unix */
 138
 139 typedef struct {
 140     const char  *zipped;
 141     int         ziplen;
 142     const char  *normal;        /* for unzip - must not be longer than zipped */
 143 } suffixes_t;
 144 static suffixes_t suffixes[] = {
 145 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 146         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 147         SUFFIX(GZ_SUFFIX,       ""),
 148         SUFFIX(".z",            ""),
 149         SUFFIX("-gz",           ""),
 150         SUFFIX("-z",            ""),
 151         SUFFIX("_z",            ""),
 152         SUFFIX(".taz",          ".tar"),
 153         SUFFIX(".tgz",          ".tar"),
 154 #ifndef NO_BZIP2_SUPPORT
 155         SUFFIX(BZ2_SUFFIX,      ""),
 156         SUFFIX(".tbz",          ".tar"),
 157         SUFFIX(".tbz2",         ".tar"),
 158 #endif
 159 #ifndef NO_COMPRESS_SUPPORT
 160         SUFFIX(Z_SUFFIX,        ""),
 161 #endif
 162 #ifndef NO_XZ_SUPPORT
 163         SUFFIX(XZ_SUFFIX,       ""),
 164 #endif
 165 #ifndef NO_LZ_SUPPORT
 166         SUFFIX(LZ_SUFFIX,       ""),
 167 #endif
 168         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 169 #undef SUFFIX
 170 };
 171 #define NUM_SUFFIXES (nitems(suffixes))
 172 #define SUFFIX_MAXLEN   30
 173
 174 static  const char      gzip_version[] = "FreeBSD gzip 20190107";
 175
 176 static  const char      gzip_copyright[] = \
 177 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
 178 "   All rights reserved.\n"
 179 "\n"
 180 "   Redistribution and use in source and binary forms, with or without\n"
 181 "   modification, are permitted provided that the following conditions\n"
 182 "   are met:\n"
 183 "   1. Redistributions of source code must retain the above copyright\n"
 184 "      notice, this list of conditions and the following disclaimer.\n"
 185 "   2. Redistributions in binary form must reproduce the above copyright\n"
 186 "      notice, this list of conditions and the following disclaimer in the\n"
 187 "      documentation and/or other materials provided with the distribution.\n"
 188 "\n"
 189 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
 190 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
 191 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
 192 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
 193 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
 194 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
 195 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
 196 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
 197 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
 198 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
 199 "   SUCH DAMAGE.";
 200
 201 static  int     cflag;                  /* stdout mode */
 202 static  int     dflag;                  /* decompress mode */
 203 static  int     lflag;                  /* list mode */
 204 static  int     numflag = 6;            /* gzip -1..-9 value */
 205
 206 static  const char *remove_file = NULL; /* file to be removed upon SIGINT */
 207
 208 static  int     fflag;                  /* force mode */
 209 static  int     kflag;                  /* don't delete input files */
 210 static  int     nflag;                  /* don't save name/timestamp */
 211 static  int     Nflag;                  /* don't restore name/timestamp */
 212 static  int     qflag;                  /* quiet mode */
 213 static  int     rflag;                  /* recursive mode */
 214 static  int     tflag;                  /* test */
 215 static  int     vflag;                  /* verbose mode */
 216 static  sig_atomic_t print_info = 0;
 217
 218 static  int     exit_value = 0;         /* exit value */
 219
 220 static  const char *infile;             /* name of file coming in */
 221
 222 static  void    maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
 223 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 224     !defined(NO_XZ_SUPPORT)
 225 static  void    maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
 226 #endif
 227 static  void    maybe_warn(const char *fmt, ...) __printflike(1, 2);
 228 static  void    maybe_warnx(const char *fmt, ...) __printflike(1, 2);
 229 static  enum filetype file_gettype(u_char *);
 230 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 231 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 232 static  off_t   file_compress(char *, char *, size_t);
 233 static  off_t   file_uncompress(char *, char *, size_t);
 234 static  void    handle_pathname(char *);
 235 static  void    handle_file(char *, struct stat *);
 236 static  void    handle_stdin(void);
 237 static  void    handle_stdout(void);
 238 static  void    print_ratio(off_t, off_t, FILE *);
 239 static  void    print_list(int fd, off_t, const char *, time_t);
 240 static  void    usage(void) __dead2;
 241 static  void    display_version(void) __dead2;
 242 static  void    display_license(void);
 243 static  const suffixes_t *check_suffix(char *, int);
 244 static  ssize_t read_retry(int, void *, size_t);
 245 static  ssize_t write_retry(int, const void *, size_t);
 246 static void     print_list_out(off_t, off_t, const char*);
 247
 248 static  void    infile_set(const char *newinfile, off_t total);
 249
 250 static  off_t   infile_total;           /* total expected to read/write */
 251 static  off_t   infile_current;         /* current read/write */
 252
 253 static  void    check_siginfo(void);
 254 static  off_t   cat_fd(unsigned char *, size_t, off_t *, int fd);
 255 static  void    prepend_gzip(char *, int *, char ***);
 256 static  void    handle_dir(char *);
 257 static  void    print_verbage(const char *, const char *, off_t, off_t);
 258 static  void    print_test(const char *, int);
 259 static  void    copymodes(int fd, const struct stat *, const char *file);
 260 static  int     check_outfile(const char *outfile);
 261 static  void    setup_signals(void);
 262 static  void    infile_newdata(size_t newdata);
 263 static  void    infile_clear(void);
 264
 265 #ifndef NO_BZIP2_SUPPORT
 266 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 267 #endif
 268
 269 #ifndef NO_COMPRESS_SUPPORT
 270 static  FILE    *zdopen(int);
 271 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 272 #endif
 273
 274 #ifndef NO_PACK_SUPPORT
 275 static  off_t   unpack(int, int, char *, size_t, off_t *);
 276 #endif
 277
 278 #ifndef NO_XZ_SUPPORT
 279 static  off_t   unxz(int, int, char *, size_t, off_t *);
 280 static  off_t   unxz_len(int);
 281 #endif
 282
 283 #ifndef NO_LZ_SUPPORT
 284 static  off_t   unlz(int, int, char *, size_t, off_t *);
 285 #endif
 286
 287 static const struct option longopts[] = {
 288         { "stdout",             no_argument,            0,      'c' },
 289         { "to-stdout",          no_argument,            0,      'c' },
 290         { "decompress",         no_argument,            0,      'd' },
 291         { "uncompress",         no_argument,            0,      'd' },
 292         { "force",              no_argument,            0,      'f' },
 293         { "help",               no_argument,            0,      'h' },
 294         { "keep",               no_argument,            0,      'k' },
 295         { "list",               no_argument,            0,      'l' },
 296         { "no-name",            no_argument,            0,      'n' },
 297         { "name",               no_argument,            0,      'N' },
 298         { "quiet",              no_argument,            0,      'q' },
 299         { "recursive",          no_argument,            0,      'r' },
 300         { "suffix",             required_argument,      0,      'S' },
 301         { "test",               no_argument,            0,      't' },
 302         { "verbose",            no_argument,            0,      'v' },
 303         { "version",            no_argument,            0,      'V' },
 304         { "fast",               no_argument,            0,      '1' },
 305         { "best",               no_argument,            0,      '9' },
 306         { "ascii",              no_argument,            0,      'a' },
 307         { "license",            no_argument,            0,      'L' },
 308         { NULL,                 no_argument,            0,      0 },
 309 };
 310
 311 int
 312 main(int argc, char **argv)
 313 {
 314         const char *progname = getprogname();
 315         char *gzip;
 316         int len;
 317         int ch;
 318
 319         setup_signals();
 320
 321         if ((gzip = getenv("GZIP")) != NULL)
 322                 prepend_gzip(gzip, &argc, &argv);
 323
 324         /*
 325          * XXX
 326          * handle being called `gunzip', `zcat' and `gzcat'
 327          */
 328         if (strcmp(progname, "gunzip") == 0)
 329                 dflag = 1;
 330         else if (strcmp(progname, "zcat") == 0 ||
 331                  strcmp(progname, "gzcat") == 0)
 332                 dflag = cflag = 1;
 333
 334 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
 335
 336         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 337                 switch (ch) {
 338                 case '1': case '2': case '3':
 339                 case '4': case '5': case '6':
 340                 case '7': case '8': case '9':
 341                         numflag = ch - '0';
 342                         break;
 343                 case 'c':
 344                         cflag = 1;
 345                         break;
 346                 case 'd':
 347                         dflag = 1;
 348                         break;
 349                 case 'l':
 350                         lflag = 1;
 351                         dflag = 1;
 352                         break;
 353                 case 'V':
 354                         display_version();
 355                         /* NOTREACHED */
 356                 case 'a':
 357                         fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
 358                         break;
 359                 case 'f':
 360                         fflag = 1;
 361                         break;
 362                 case 'k':
 363                         kflag = 1;
 364                         break;
 365                 case 'L':
 366                         display_license();
 367                         /* NOT REACHED */
 368                 case 'N':
 369                         nflag = 0;
 370                         Nflag = 1;
 371                         break;
 372                 case 'n':
 373                         nflag = 1;
 374                         Nflag = 0;
 375                         break;
 376                 case 'q':
 377                         qflag = 1;
 378                         break;
 379                 case 'r':
 380                         rflag = 1;
 381                         break;
 382                 case 'S':
 383                         len = strlen(optarg);
 384                         if (len != 0) {
 385                                 if (len > SUFFIX_MAXLEN)
 386                                         errx(1, "incorrect suffix: '%s': too long", optarg);
 387                                 suffixes[0].zipped = optarg;
 388                                 suffixes[0].ziplen = len;
 389                         } else {
 390                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 391                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 392                         }
 393                         break;
 394                 case 't':
 395                         cflag = 1;
 396                         tflag = 1;
 397                         dflag = 1;
 398                         break;
 399                 case 'v':
 400                         vflag = 1;
 401                         break;
 402                 default:
 403                         usage();
 404                         /* NOTREACHED */
 405                 }
 406         }
 407         argv += optind;
 408         argc -= optind;
 409
 410         if (argc == 0) {
 411                 if (dflag)      /* stdin mode */
 412                         handle_stdin();
 413                 else            /* stdout mode */
 414                         handle_stdout();
 415         } else {
 416                 do {
 417                         handle_pathname(argv[0]);
 418                 } while (*++argv);
 419         }
 420         if (qflag == 0 && lflag && argc > 1)
 421                 print_list(-1, 0, "(totals)", 0);
 422         exit(exit_value);
 423 }
 424
 425 /* maybe print a warning */
 426 void
 427 maybe_warn(const char *fmt, ...)
 428 {
 429         va_list ap;
 430
 431         if (qflag == 0) {
 432                 va_start(ap, fmt);
 433                 vwarn(fmt, ap);
 434                 va_end(ap);
 435         }
 436         if (exit_value == 0)
 437                 exit_value = 1;
 438 }
 439
 440 /* ... without an errno. */
 441 void
 442 maybe_warnx(const char *fmt, ...)
 443 {
 444         va_list ap;
 445
 446         if (qflag == 0) {
 447                 va_start(ap, fmt);
 448                 vwarnx(fmt, ap);
 449                 va_end(ap);
 450         }
 451         if (exit_value == 0)
 452                 exit_value = 1;
 453 }
 454
 455 /* maybe print an error */
 456 void
 457 maybe_err(const char *fmt, ...)
 458 {
 459         va_list ap;
 460
 461         if (qflag == 0) {
 462                 va_start(ap, fmt);
 463                 vwarn(fmt, ap);
 464                 va_end(ap);
 465         }
 466         exit(2);
 467 }
 468
 469 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 470     !defined(NO_XZ_SUPPORT)
 471 /* ... without an errno. */
 472 void
 473 maybe_errx(const char *fmt, ...)
 474 {
 475         va_list ap;
 476
 477         if (qflag == 0) {
 478                 va_start(ap, fmt);
 479                 vwarnx(fmt, ap);
 480                 va_end(ap);
 481         }
 482         exit(2);
 483 }
 484 #endif
 485
 486 /* split up $GZIP and prepend it to the argument list */
 487 static void
 488 prepend_gzip(char *gzip, int *argc, char ***argv)
 489 {
 490         char *s, **nargv, **ac;
 491         int nenvarg = 0, i;
 492
 493         /* scan how many arguments there are */
 494         for (s = gzip;;) {
 495                 while (*s == ' ' || *s == '\t')
 496                         s++;
 497                 if (*s == 0)
 498                         goto count_done;
 499                 nenvarg++;
 500                 while (*s != ' ' && *s != '\t')
 501                         if (*s++ == 0)
 502                                 goto count_done;
 503         }
 504 count_done:
 505         /* punt early */
 506         if (nenvarg == 0)
 507                 return;
 508
 509         *argc += nenvarg;
 510         ac = *argv;
 511
 512         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 513         if (nargv == NULL)
 514                 maybe_err("malloc");
 515
 516         /* stash this away */
 517         *argv = nargv;
 518
 519         /* copy the program name first */
 520         i = 0;
 521         nargv[i++] = *(ac++);
 522
 523         /* take a copy of $GZIP and add it to the array */
 524         s = strdup(gzip);
 525         if (s == NULL)
 526                 maybe_err("strdup");
 527         for (;;) {
 528                 /* Skip whitespaces. */
 529                 while (*s == ' ' || *s == '\t')
 530                         s++;
 531                 if (*s == 0)
 532                         goto copy_done;
 533                 nargv[i++] = s;
 534                 /* Find the end of this argument. */
 535                 while (*s != ' ' && *s != '\t')
 536                         if (*s++ == 0)
 537                                 /* Argument followed by NUL. */
 538                                 goto copy_done;
 539                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 540                 *s++ = 0;
 541         }
 542 copy_done:
 543
 544         /* copy the original arguments and a NULL */
 545         while (*ac)
 546                 nargv[i++] = *(ac++);
 547         nargv[i] = NULL;
 548 }
 549
 550 /* compress input to output. Return bytes read, -1 on error */
 551 static off_t
 552 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 553 {
 554         z_stream z;
 555         char *outbufp, *inbufp;
 556         off_t in_tot = 0, out_tot = 0;
 557         ssize_t in_size;
 558         int i, error;
 559         uLong crc;
 560
 561         outbufp = malloc(BUFLEN);
 562         inbufp = malloc(BUFLEN);
 563         if (outbufp == NULL || inbufp == NULL) {
 564                 maybe_err("malloc failed");
 565                 goto out;
 566         }
 567
 568         memset(&z, 0, sizeof z);
 569         z.zalloc = Z_NULL;
 570         z.zfree = Z_NULL;
 571         z.opaque = 0;
 572
 573         if (nflag != 0) {
 574                 mtime = 0;
 575                 origname = "";
 576         }
 577
 578         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 579                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 580                      *origname ? ORIG_NAME : 0,
 581                      mtime & 0xff,
 582                      (mtime >> 8) & 0xff,
 583                      (mtime >> 16) & 0xff,
 584                      (mtime >> 24) & 0xff,
 585                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 586                      OS_CODE, origname);
 587         if (i >= BUFLEN)
 588                 /* this need PATH_MAX > BUFLEN ... */
 589                 maybe_err("snprintf");
 590         if (*origname)
 591                 i++;
 592
 593         z.next_out = (unsigned char *)outbufp + i;
 594         z.avail_out = BUFLEN - i;
 595
 596         error = deflateInit2(&z, numflag, Z_DEFLATED,
 597                              (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
 598         if (error != Z_OK) {
 599                 maybe_warnx("deflateInit2 failed");
 600                 in_tot = -1;
 601                 goto out;
 602         }
 603
 604         crc = crc32(0L, Z_NULL, 0);
 605         for (;;) {
 606                 if (z.avail_out == 0) {
 607                         if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
 608                                 maybe_warn("write");
 609                                 out_tot = -1;
 610                                 goto out;
 611                         }
 612
 613                         out_tot += BUFLEN;
 614                         z.next_out = (unsigned char *)outbufp;
 615                         z.avail_out = BUFLEN;
 616                 }
 617
 618                 if (z.avail_in == 0) {
 619                         in_size = read(in, inbufp, BUFLEN);
 620                         if (in_size < 0) {
 621                                 maybe_warn("read");
 622                                 in_tot = -1;
 623                                 goto out;
 624                         }
 625                         if (in_size == 0)
 626                                 break;
 627                         infile_newdata(in_size);
 628
 629                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 630                         in_tot += in_size;
 631                         z.next_in = (unsigned char *)inbufp;
 632                         z.avail_in = in_size;
 633                 }
 634
 635                 error = deflate(&z, Z_NO_FLUSH);
 636                 if (error != Z_OK && error != Z_STREAM_END) {
 637                         maybe_warnx("deflate failed");
 638                         in_tot = -1;
 639                         goto out;
 640                 }
 641         }
 642
 643         /* clean up */
 644         for (;;) {
 645                 size_t len;
 646                 ssize_t w;
 647
 648                 error = deflate(&z, Z_FINISH);
 649                 if (error != Z_OK && error != Z_STREAM_END) {
 650                         maybe_warnx("deflate failed");
 651                         in_tot = -1;
 652                         goto out;
 653                 }
 654
 655                 len = (char *)z.next_out - outbufp;
 656
 657                 w = write_retry(out, outbufp, len);
 658                 if (w == -1 || (size_t)w != len) {
 659                         maybe_warn("write");
 660                         out_tot = -1;
 661                         goto out;
 662                 }
 663                 out_tot += len;
 664                 z.next_out = (unsigned char *)outbufp;
 665                 z.avail_out = BUFLEN;
 666
 667                 if (error == Z_STREAM_END)
 668                         break;
 669         }
 670
 671         if (deflateEnd(&z) != Z_OK) {
 672                 maybe_warnx("deflateEnd failed");
 673                 in_tot = -1;
 674                 goto out;
 675         }
 676
 677         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 678                  (int)crc & 0xff,
 679                  (int)(crc >> 8) & 0xff,
 680                  (int)(crc >> 16) & 0xff,
 681                  (int)(crc >> 24) & 0xff,
 682                  (int)in_tot & 0xff,
 683                  (int)(in_tot >> 8) & 0xff,
 684                  (int)(in_tot >> 16) & 0xff,
 685                  (int)(in_tot >> 24) & 0xff);
 686         if (i != 8)
 687                 maybe_err("snprintf");
 688         if (write_retry(out, outbufp, i) != i) {
 689                 maybe_warn("write");
 690                 in_tot = -1;
 691         } else
 692                 out_tot += i;
 693
 694 out:
 695         if (inbufp != NULL)
 696                 free(inbufp);
 697         if (outbufp != NULL)
 698                 free(outbufp);
 699         if (gsizep)
 700                 *gsizep = out_tot;
 701         return in_tot;
 702 }
 703
 704 /*
 705  * uncompress input to output then close the input.  return the
 706  * uncompressed size written, and put the compressed sized read
 707  * into `*gsizep'.
 708  */
 709 static off_t
 710 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 711               const char *filename)
 712 {
 713         z_stream z;
 714         char *outbufp, *inbufp;
 715         off_t out_tot = -1, in_tot = 0;
 716         uint32_t out_sub_tot = 0;
 717         enum {
 718                 GZSTATE_MAGIC0,
 719                 GZSTATE_MAGIC1,
 720                 GZSTATE_METHOD,
 721                 GZSTATE_FLAGS,
 722                 GZSTATE_SKIPPING,
 723                 GZSTATE_EXTRA,
 724                 GZSTATE_EXTRA2,
 725                 GZSTATE_EXTRA3,
 726                 GZSTATE_ORIGNAME,
 727                 GZSTATE_COMMENT,
 728                 GZSTATE_HEAD_CRC1,
 729                 GZSTATE_HEAD_CRC2,
 730                 GZSTATE_INIT,
 731                 GZSTATE_READ,
 732                 GZSTATE_CRC,
 733                 GZSTATE_LEN,
 734         } state = GZSTATE_MAGIC0;
 735         int flags = 0, skip_count = 0;
 736         int error = Z_STREAM_ERROR, done_reading = 0;
 737         uLong crc = 0;
 738         ssize_t wr;
 739         int needmore = 0;
 740
 741 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 742
 743         if ((outbufp = malloc(BUFLEN)) == NULL) {
 744                 maybe_err("malloc failed");
 745                 goto out2;
 746         }
 747         if ((inbufp = malloc(BUFLEN)) == NULL) {
 748                 maybe_err("malloc failed");
 749                 goto out1;
 750         }
 751
 752         memset(&z, 0, sizeof z);
 753         z.avail_in = prelen;
 754         z.next_in = (unsigned char *)pre;
 755         z.avail_out = BUFLEN;
 756         z.next_out = (unsigned char *)outbufp;
 757         z.zalloc = NULL;
 758         z.zfree = NULL;
 759         z.opaque = 0;
 760
 761         in_tot = prelen;
 762         out_tot = 0;
 763
 764         for (;;) {
 765                 check_siginfo();
 766                 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
 767                         ssize_t in_size;
 768
 769                         if (z.avail_in > 0) {
 770                                 memmove(inbufp, z.next_in, z.avail_in);
 771                         }
 772                         z.next_in = (unsigned char *)inbufp;
 773                         in_size = read(in, z.next_in + z.avail_in,
 774                             BUFLEN - z.avail_in);
 775
 776                         if (in_size == -1) {
 777                                 maybe_warn("failed to read stdin");
 778                                 goto stop_and_fail;
 779                         } else if (in_size == 0) {
 780                                 done_reading = 1;
 781                         }
 782                         infile_newdata(in_size);
 783
 784                         z.avail_in += in_size;
 785                         needmore = 0;
 786
 787                         in_tot += in_size;
 788                 }
 789                 if (z.avail_in == 0) {
 790                         if (done_reading && state != GZSTATE_MAGIC0) {
 791                                 maybe_warnx("%s: unexpected end of file",
 792                                             filename);
 793                                 goto stop_and_fail;
 794                         }
 795                         goto stop;
 796                 }
 797                 switch (state) {
 798                 case GZSTATE_MAGIC0:
 799                         if (*z.next_in != GZIP_MAGIC0) {
 800                                 if (in_tot > 0) {
 801                                         maybe_warnx("%s: trailing garbage "
 802                                                     "ignored", filename);
 803                                         exit_value = 2;
 804                                         goto stop;
 805                                 }
 806                                 maybe_warnx("input not gziped (MAGIC0)");
 807                                 goto stop_and_fail;
 808                         }
 809                         ADVANCE();
 810                         state++;
 811                         out_sub_tot = 0;
 812                         crc = crc32(0L, Z_NULL, 0);
 813                         break;
 814
 815                 case GZSTATE_MAGIC1:
 816                         if (*z.next_in != GZIP_MAGIC1 &&
 817                             *z.next_in != GZIP_OMAGIC1) {
 818                                 maybe_warnx("input not gziped (MAGIC1)");
 819                                 goto stop_and_fail;
 820                         }
 821                         ADVANCE();
 822                         state++;
 823                         break;
 824
 825                 case GZSTATE_METHOD:
 826                         if (*z.next_in != Z_DEFLATED) {
 827                                 maybe_warnx("unknown compression method");
 828                                 goto stop_and_fail;
 829                         }
 830                         ADVANCE();
 831                         state++;
 832                         break;
 833
 834                 case GZSTATE_FLAGS:
 835                         flags = *z.next_in;
 836                         ADVANCE();
 837                         skip_count = 6;
 838                         state++;
 839                         break;
 840
 841                 case GZSTATE_SKIPPING:
 842                         if (skip_count > 0) {
 843                                 skip_count--;
 844                                 ADVANCE();
 845                         } else
 846                                 state++;
 847                         break;
 848
 849                 case GZSTATE_EXTRA:
 850                         if ((flags & EXTRA_FIELD) == 0) {
 851                                 state = GZSTATE_ORIGNAME;
 852                                 break;
 853                         }
 854                         skip_count = *z.next_in;
 855                         ADVANCE();
 856                         state++;
 857                         break;
 858
 859                 case GZSTATE_EXTRA2:
 860                         skip_count |= ((*z.next_in) << 8);
 861                         ADVANCE();
 862                         state++;
 863                         break;
 864
 865                 case GZSTATE_EXTRA3:
 866                         if (skip_count > 0) {
 867                                 skip_count--;
 868                                 ADVANCE();
 869                         } else
 870                                 state++;
 871                         break;
 872
 873                 case GZSTATE_ORIGNAME:
 874                         if ((flags & ORIG_NAME) == 0) {
 875                                 state++;
 876                                 break;
 877                         }
 878                         if (*z.next_in == 0)
 879                                 state++;
 880                         ADVANCE();
 881                         break;
 882
 883                 case GZSTATE_COMMENT:
 884                         if ((flags & COMMENT) == 0) {
 885                                 state++;
 886                                 break;
 887                         }
 888                         if (*z.next_in == 0)
 889                                 state++;
 890                         ADVANCE();
 891                         break;
 892
 893                 case GZSTATE_HEAD_CRC1:
 894                         if (flags & HEAD_CRC)
 895                                 skip_count = 2;
 896                         else
 897                                 skip_count = 0;
 898                         state++;
 899                         break;
 900
 901                 case GZSTATE_HEAD_CRC2:
 902                         if (skip_count > 0) {
 903                                 skip_count--;
 904                                 ADVANCE();
 905                         } else
 906                                 state++;
 907                         break;
 908
 909                 case GZSTATE_INIT:
 910                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 911                                 maybe_warnx("failed to inflateInit");
 912                                 goto stop_and_fail;
 913                         }
 914                         state++;
 915                         break;
 916
 917                 case GZSTATE_READ:
 918                         error = inflate(&z, Z_FINISH);
 919                         switch (error) {
 920                         /* Z_BUF_ERROR goes with Z_FINISH... */
 921                         case Z_BUF_ERROR:
 922                                 if (z.avail_out > 0 && !done_reading)
 923                                         continue;
 924
 925                         case Z_STREAM_END:
 926                         case Z_OK:
 927                                 break;
 928
 929                         case Z_NEED_DICT:
 930                                 maybe_warnx("Z_NEED_DICT error");
 931                                 goto stop_and_fail;
 932                         case Z_DATA_ERROR:
 933                                 maybe_warnx("data stream error");
 934                                 goto stop_and_fail;
 935                         case Z_STREAM_ERROR:
 936                                 maybe_warnx("internal stream error");
 937                                 goto stop_and_fail;
 938                         case Z_MEM_ERROR:
 939                                 maybe_warnx("memory allocation error");
 940                                 goto stop_and_fail;
 941
 942                         default:
 943                                 maybe_warn("unknown error from inflate(): %d",
 944                                     error);
 945                         }
 946                         wr = BUFLEN - z.avail_out;
 947
 948                         if (wr != 0) {
 949                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 950                                 if (
 951                                     /* don't write anything with -t */
 952                                     tflag == 0 &&
 953                                     write_retry(out, outbufp, wr) != wr) {
 954                                         maybe_warn("error writing to output");
 955                                         goto stop_and_fail;
 956                                 }
 957
 958                                 out_tot += wr;
 959                                 out_sub_tot += wr;
 960                         }
 961
 962                         if (error == Z_STREAM_END) {
 963                                 inflateEnd(&z);
 964                                 state++;
 965                         }
 966
 967                         z.next_out = (unsigned char *)outbufp;
 968                         z.avail_out = BUFLEN;
 969
 970                         break;
 971                 case GZSTATE_CRC:
 972                         {
 973                                 uLong origcrc;
 974
 975                                 if (z.avail_in < 4) {
 976                                         if (!done_reading) {
 977                                                 needmore = 1;
 978                                                 continue;
 979                                         }
 980                                         maybe_warnx("truncated input");
 981                                         goto stop_and_fail;
 982                                 }
 983                                 origcrc = le32dec(&z.next_in[0]);
 984                                 if (origcrc != crc) {
 985                                         maybe_warnx("invalid compressed"
 986                                              " data--crc error");
 987                                         goto stop_and_fail;
 988                                 }
 989                         }
 990
 991                         z.avail_in -= 4;
 992                         z.next_in += 4;
 993
 994                         if (!z.avail_in && done_reading) {
 995                                 goto stop;
 996                         }
 997                         state++;
 998                         break;
 999                 case GZSTATE_LEN:
1000                         {
1001                                 uLong origlen;
1002
1003                                 if (z.avail_in < 4) {
1004                                         if (!done_reading) {
1005                                                 needmore = 1;
1006                                                 continue;
1007                                         }
1008                                         maybe_warnx("truncated input");
1009                                         goto stop_and_fail;
1010                                 }
1011                                 origlen = le32dec(&z.next_in[0]);
1012
1013                                 if (origlen != out_sub_tot) {
1014                                         maybe_warnx("invalid compressed"
1015                                              " data--length error");
1016                                         goto stop_and_fail;
1017                                 }
1018                         }
1019
1020                         z.avail_in -= 4;
1021                         z.next_in += 4;
1022
1023                         if (error < 0) {
1024                                 maybe_warnx("decompression error");
1025                                 goto stop_and_fail;
1026                         }
1027                         state = GZSTATE_MAGIC0;
1028                         break;
1029                 }
1030                 continue;
1031 stop_and_fail:
1032                 out_tot = -1;
1033 stop:
1034                 break;
1035         }
1036         if (state > GZSTATE_INIT)
1037                 inflateEnd(&z);
1038
1039         free(inbufp);
1040 out1:
1041         free(outbufp);
1042 out2:
1043         if (gsizep)
1044                 *gsizep = in_tot;
1045         return (out_tot);
1046 }
1047
1048 /*
1049  * set the owner, mode, flags & utimes using the given file descriptor.
1050  * file is only used in possible warning messages.
1051  */
1052 static void
1053 copymodes(int fd, const struct stat *sbp, const char *file)
1054 {
1055         struct timespec times[2];
1056         struct stat sb;
1057
1058         /*
1059          * If we have no info on the input, give this file some
1060          * default values and return..
1061          */
1062         if (sbp == NULL) {
1063                 mode_t mask = umask(022);
1064
1065                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1066                 (void)umask(mask);
1067                 return;
1068         }
1069         sb = *sbp;
1070
1071         /* if the chown fails, remove set-id bits as-per compress(1) */
1072         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1073                 if (errno != EPERM)
1074                         maybe_warn("couldn't fchown: %s", file);
1075                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1076         }
1077
1078         /* we only allow set-id and the 9 normal permission bits */
1079         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1080         if (fchmod(fd, sb.st_mode) < 0)
1081                 maybe_warn("couldn't fchmod: %s", file);
1082
1083         times[0] = sb.st_atim;
1084         times[1] = sb.st_mtim;
1085         if (futimens(fd, times) < 0)
1086                 maybe_warn("couldn't futimens: %s", file);
1087
1088         /* only try flags if they exist already */
1089         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1090                 maybe_warn("couldn't fchflags: %s", file);
1091 }
1092
1093 /* what sort of file is this? */
1094 static enum filetype
1095 file_gettype(u_char *buf)
1096 {
1097
1098         if (buf[0] == GZIP_MAGIC0 &&
1099             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1100                 return FT_GZIP;
1101         else
1102 #ifndef NO_BZIP2_SUPPORT
1103         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1104             buf[3] >= '0' && buf[3] <= '9')
1105                 return FT_BZIP2;
1106         else
1107 #endif
1108 #ifndef NO_COMPRESS_SUPPORT
1109         if (memcmp(buf, Z_MAGIC, 2) == 0)
1110                 return FT_Z;
1111         else
1112 #endif
1113 #ifndef NO_PACK_SUPPORT
1114         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1115                 return FT_PACK;
1116         else
1117 #endif
1118 #ifndef NO_XZ_SUPPORT
1119         if (memcmp(buf, XZ_MAGIC, 4) == 0)      /* XXX: We only have 4 bytes */
1120                 return FT_XZ;
1121         else
1122 #endif
1123 #ifndef NO_LZ_SUPPORT
1124         if (memcmp(buf, LZ_MAGIC, 4) == 0)
1125                 return FT_LZ;
1126         else
1127 #endif
1128                 return FT_UNKNOWN;
1129 }
1130
1131 /* check the outfile is OK. */
1132 static int
1133 check_outfile(const char *outfile)
1134 {
1135         struct stat sb;
1136         int ok = 1;
1137
1138         if (lflag == 0 && stat(outfile, &sb) == 0) {
1139                 if (fflag)
1140                         unlink(outfile);
1141                 else if (isatty(STDIN_FILENO)) {
1142                         char ans[10] = { 'n', '\0' };   /* default */
1143
1144                         fprintf(stderr, "%s already exists -- do you wish to "
1145                                         "overwrite (y or n)? " , outfile);
1146                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1147                         if (ans[0] != 'y' && ans[0] != 'Y') {
1148                                 fprintf(stderr, "\tnot overwriting\n");
1149                                 ok = 0;
1150                         } else
1151                                 unlink(outfile);
1152                 } else {
1153                         maybe_warnx("%s already exists -- skipping", outfile);
1154                         ok = 0;
1155                 }
1156         }
1157         return ok;
1158 }
1159
1160 static void
1161 unlink_input(const char *file, const struct stat *sb)
1162 {
1163         struct stat nsb;
1164
1165         if (kflag)
1166                 return;
1167         if (stat(file, &nsb) != 0)
1168                 /* Must be gone already */
1169                 return;
1170         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1171                 /* Definitely a different file */
1172                 return;
1173         unlink(file);
1174 }
1175
1176 static void
1177 got_sigint(int signo __unused)
1178 {
1179
1180         if (remove_file != NULL)
1181                 unlink(remove_file);
1182         _exit(2);
1183 }
1184
1185 static void
1186 got_siginfo(int signo __unused)
1187 {
1188
1189         print_info = 1;
1190 }
1191
1192 static void
1193 setup_signals(void)
1194 {
1195
1196         signal(SIGINFO, got_siginfo);
1197         signal(SIGINT, got_sigint);
1198 }
1199
1200 static  void
1201 infile_newdata(size_t newdata)
1202 {
1203
1204         infile_current += newdata;
1205 }
1206
1207 static  void
1208 infile_set(const char *newinfile, off_t total)
1209 {
1210
1211         if (newinfile)
1212                 infile = newinfile;
1213         infile_total = total;
1214 }
1215
1216 static  void
1217 infile_clear(void)
1218 {
1219
1220         infile = NULL;
1221         infile_total = infile_current = 0;
1222 }
1223
1224 static const suffixes_t *
1225 check_suffix(char *file, int xlate)
1226 {
1227         const suffixes_t *s;
1228         int len = strlen(file);
1229         char *sp;
1230
1231         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1232                 /* if it doesn't fit in "a.suf", don't bother */
1233                 if (s->ziplen >= len)
1234                         continue;
1235                 sp = file + len - s->ziplen;
1236                 if (strcmp(s->zipped, sp) != 0)
1237                         continue;
1238                 if (xlate)
1239                         strcpy(sp, s->normal);
1240                 return s;
1241         }
1242         return NULL;
1243 }
1244
1245 /*
1246  * compress the given file: create a corresponding .gz file and remove the
1247  * original.
1248  */
1249 static off_t
1250 file_compress(char *file, char *outfile, size_t outsize)
1251 {
1252         int in;
1253         int out;
1254         off_t size, in_size;
1255         struct stat isb, osb;
1256         const suffixes_t *suff;
1257
1258         in = open(file, O_RDONLY);
1259         if (in == -1) {
1260                 maybe_warn("can't open %s", file);
1261                 return (-1);
1262         }
1263
1264         if (fstat(in, &isb) != 0) {
1265                 maybe_warn("couldn't stat: %s", file);
1266                 close(in);
1267                 return (-1);
1268         }
1269
1270         if (fstat(in, &isb) != 0) {
1271                 close(in);
1272                 maybe_warn("can't stat %s", file);
1273                 return -1;
1274         }
1275         infile_set(file, isb.st_size);
1276
1277         if (cflag == 0) {
1278                 if (isb.st_nlink > 1 && fflag == 0) {
1279                         maybe_warnx("%s has %ju other link%s -- "
1280                                     "skipping", file,
1281                                     (uintmax_t)isb.st_nlink - 1,
1282                                     isb.st_nlink == 1 ? "" : "s");
1283                         close(in);
1284                         return -1;
1285                 }
1286
1287                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1288                     suff->zipped[0] != 0) {
1289                         maybe_warnx("%s already has %s suffix -- unchanged",
1290                             file, suff->zipped);
1291                         close(in);
1292                         return (-1);
1293                 }
1294
1295                 /* Add (usually) .gz to filename */
1296                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1297                     file, suffixes[0].zipped) >= outsize)
1298                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1299                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1300
1301                 if (check_outfile(outfile) == 0) {
1302                         close(in);
1303                         return (-1);
1304                 }
1305         }
1306
1307         if (cflag == 0) {
1308                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1309                 if (out == -1) {
1310                         maybe_warn("could not create output: %s", outfile);
1311                         fclose(stdin);
1312                         return (-1);
1313                 }
1314                 remove_file = outfile;
1315         } else
1316                 out = STDOUT_FILENO;
1317
1318         in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1319
1320         (void)close(in);
1321
1322         /*
1323          * If there was an error, in_size will be -1.
1324          * If we compressed to stdout, just return the size.
1325          * Otherwise stat the file and check it is the correct size.
1326          * We only blow away the file if we can stat the output and it
1327          * has the expected size.
1328          */
1329         if (cflag != 0)
1330                 return in_size == -1 ? -1 : size;
1331
1332         if (fstat(out, &osb) != 0) {
1333                 maybe_warn("couldn't stat: %s", outfile);
1334                 goto bad_outfile;
1335         }
1336
1337         if (osb.st_size != size) {
1338                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1339                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1340                 goto bad_outfile;
1341         }
1342
1343         copymodes(out, &isb, outfile);
1344         remove_file = NULL;
1345         if (close(out) == -1)
1346                 maybe_warn("couldn't close output");
1347
1348         /* output is good, ok to delete input */
1349         unlink_input(file, &isb);
1350         return (size);
1351
1352     bad_outfile:
1353         if (close(out) == -1)
1354                 maybe_warn("couldn't close output");
1355
1356         maybe_warnx("leaving original %s", file);
1357         unlink(outfile);
1358         return (size);
1359 }
1360
1361 /* uncompress the given file and remove the original */
1362 static off_t
1363 file_uncompress(char *file, char *outfile, size_t outsize)
1364 {
1365         struct stat isb, osb;
1366         off_t size;
1367         ssize_t rbytes;
1368         unsigned char fourbytes[4];
1369         enum filetype method;
1370         int fd, ofd, zfd = -1;
1371         int error;
1372         size_t in_size;
1373         ssize_t rv;
1374         time_t timestamp = 0;
1375         char name[PATH_MAX + 1];
1376
1377         /* gather the old name info */
1378
1379         fd = open(file, O_RDONLY);
1380         if (fd < 0) {
1381                 maybe_warn("can't open %s", file);
1382                 goto lose;
1383         }
1384         if (fstat(fd, &isb) != 0) {
1385                 maybe_warn("can't stat %s", file);
1386                 goto lose;
1387         }
1388         if (S_ISREG(isb.st_mode))
1389                 in_size = isb.st_size;
1390         else
1391                 in_size = 0;
1392         infile_set(file, in_size);
1393
1394         strlcpy(outfile, file, outsize);
1395         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1396                 maybe_warnx("%s: unknown suffix -- ignored", file);
1397                 goto lose;
1398         }
1399
1400         rbytes = read(fd, fourbytes, sizeof fourbytes);
1401         if (rbytes != sizeof fourbytes) {
1402                 /* we don't want to fail here. */
1403                 if (fflag)
1404                         goto lose;
1405                 if (rbytes == -1)
1406                         maybe_warn("can't read %s", file);
1407                 else
1408                         goto unexpected_EOF;
1409                 goto lose;
1410         }
1411         infile_newdata(rbytes);
1412
1413         method = file_gettype(fourbytes);
1414         if (fflag == 0 && method == FT_UNKNOWN) {
1415                 maybe_warnx("%s: not in gzip format", file);
1416                 goto lose;
1417         }
1418
1419
1420         if (method == FT_GZIP && Nflag) {
1421                 unsigned char ts[4];    /* timestamp */
1422
1423                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1424                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1425                         goto unexpected_EOF;
1426                 if (rv == -1) {
1427                         if (!fflag)
1428                                 maybe_warn("can't read %s", file);
1429                         goto lose;
1430                 }
1431                 infile_newdata(rv);
1432                 timestamp = le32dec(&ts[0]);
1433
1434                 if (fourbytes[3] & ORIG_NAME) {
1435                         rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1436                         if (rbytes < 0) {
1437                                 maybe_warn("can't read %s", file);
1438                                 goto lose;
1439                         }
1440                         if (name[0] != '\0') {
1441                                 char *dp, *nf;
1442
1443                                 /* Make sure that name is NUL-terminated */
1444                                 name[rbytes] = '\0';
1445
1446                                 /* strip saved directory name */
1447                                 nf = strrchr(name, '/');
1448                                 if (nf == NULL)
1449                                         nf = name;
1450                                 else
1451                                         nf++;
1452
1453                                 /* preserve original directory name */
1454                                 dp = strrchr(file, '/');
1455                                 if (dp == NULL)
1456                                         dp = file;
1457                                 else
1458                                         dp++;
1459                                 snprintf(outfile, outsize, "%.*s%.*s",
1460                                                 (int) (dp - file),
1461                                                 file, (int) rbytes, nf);
1462                         }
1463                 }
1464         }
1465         lseek(fd, 0, SEEK_SET);
1466
1467         if (cflag == 0 || lflag) {
1468                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1469                         maybe_warnx("%s has %ju other links -- skipping",
1470                             file, (uintmax_t)isb.st_nlink - 1);
1471                         goto lose;
1472                 }
1473                 if (nflag == 0 && timestamp)
1474                         isb.st_mtime = timestamp;
1475                 if (check_outfile(outfile) == 0)
1476                         goto lose;
1477         }
1478
1479         if (cflag)
1480                 zfd = STDOUT_FILENO;
1481         else if (lflag)
1482                 zfd = -1;
1483         else {
1484                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1485                 if (zfd == STDOUT_FILENO) {
1486                         /* We won't close STDOUT_FILENO later... */
1487                         zfd = dup(zfd);
1488                         close(STDOUT_FILENO);
1489                 }
1490                 if (zfd == -1) {
1491                         maybe_warn("can't open %s", outfile);
1492                         goto lose;
1493                 }
1494                 remove_file = outfile;
1495         }
1496
1497         switch (method) {
1498 #ifndef NO_BZIP2_SUPPORT
1499         case FT_BZIP2:
1500                 /* XXX */
1501                 if (lflag) {
1502                         maybe_warnx("no -l with bzip2 files");
1503                         goto lose;
1504                 }
1505
1506                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1507                 break;
1508 #endif
1509
1510 #ifndef NO_COMPRESS_SUPPORT
1511         case FT_Z: {
1512                 FILE *in, *out;
1513
1514                 /* XXX */
1515                 if (lflag) {
1516                         maybe_warnx("no -l with Lempel-Ziv files");
1517                         goto lose;
1518                 }
1519
1520                 if ((in = zdopen(fd)) == NULL) {
1521                         maybe_warn("zdopen for read: %s", file);
1522                         goto lose;
1523                 }
1524
1525                 out = fdopen(dup(zfd), "w");
1526                 if (out == NULL) {
1527                         maybe_warn("fdopen for write: %s", outfile);
1528                         fclose(in);
1529                         goto lose;
1530                 }
1531
1532                 size = zuncompress(in, out, NULL, 0, NULL);
1533                 /* need to fclose() if ferror() is true... */
1534                 error = ferror(in);
1535                 if (error | fclose(in)) {
1536                         if (error)
1537                                 maybe_warn("failed infile");
1538                         else
1539                                 maybe_warn("failed infile fclose");
1540                         if (cflag == 0)
1541                                 unlink(outfile);
1542                         (void)fclose(out);
1543                         goto lose;
1544                 }
1545                 if (fclose(out) != 0) {
1546                         maybe_warn("failed outfile fclose");
1547                         if (cflag == 0)
1548                                 unlink(outfile);
1549                         goto lose;
1550                 }
1551                 break;
1552         }
1553 #endif
1554
1555 #ifndef NO_PACK_SUPPORT
1556         case FT_PACK:
1557                 if (lflag) {
1558                         maybe_warnx("no -l with packed files");
1559                         goto lose;
1560                 }
1561
1562                 size = unpack(fd, zfd, NULL, 0, NULL);
1563                 break;
1564 #endif
1565
1566 #ifndef NO_XZ_SUPPORT
1567         case FT_XZ:
1568                 if (lflag) {
1569                         size = unxz_len(fd);
1570                         if (!tflag) {
1571                                 print_list_out(in_size, size, file);
1572                                 close(fd);
1573                                 return -1;
1574                         }
1575                 } else
1576                         size = unxz(fd, zfd, NULL, 0, NULL);
1577                 break;
1578 #endif
1579
1580 #ifndef NO_LZ_SUPPORT
1581         case FT_LZ:
1582                 if (lflag) {
1583                         maybe_warnx("no -l with lzip files");
1584                         goto lose;
1585                 }
1586                 size = unlz(fd, zfd, NULL, 0, NULL);
1587                 break;
1588 #endif
1589         case FT_UNKNOWN:
1590                 if (lflag) {
1591                         maybe_warnx("no -l for unknown filetypes");
1592                         goto lose;
1593                 }
1594                 size = cat_fd(NULL, 0, NULL, fd);
1595                 break;
1596         default:
1597                 if (lflag) {
1598                         print_list(fd, in_size, outfile, isb.st_mtime);
1599                         if (!tflag) {
1600                                 close(fd);
1601                                 return -1;      /* XXX */
1602                         }
1603                 }
1604
1605                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1606                 break;
1607         }
1608
1609         if (close(fd) != 0)
1610                 maybe_warn("couldn't close input");
1611         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1612                 maybe_warn("couldn't close output");
1613
1614         if (size == -1) {
1615                 if (cflag == 0)
1616                         unlink(outfile);
1617                 maybe_warnx("%s: uncompress failed", file);
1618                 return -1;
1619         }
1620
1621         /* if testing, or we uncompressed to stdout, this is all we need */
1622         if (tflag)
1623                 return size;
1624         /* if we are uncompressing to stdin, don't remove the file. */
1625         if (cflag)
1626                 return size;
1627
1628         /*
1629          * if we create a file...
1630          */
1631         /*
1632          * if we can't stat the file don't remove the file.
1633          */
1634
1635         ofd = open(outfile, O_RDWR, 0);
1636         if (ofd == -1) {
1637                 maybe_warn("couldn't open (leaving original): %s",
1638                            outfile);
1639                 return -1;
1640         }
1641         if (fstat(ofd, &osb) != 0) {
1642                 maybe_warn("couldn't stat (leaving original): %s",
1643                            outfile);
1644                 close(ofd);
1645                 return -1;
1646         }
1647         if (osb.st_size != size) {
1648                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1649                     (uintmax_t)size, (uintmax_t)osb.st_size);
1650                 close(ofd);
1651                 unlink(outfile);
1652                 return -1;
1653         }
1654         copymodes(ofd, &isb, outfile);
1655         remove_file = NULL;
1656         close(ofd);
1657         unlink_input(file, &isb);
1658         return size;
1659
1660     unexpected_EOF:
1661         maybe_warnx("%s: unexpected end of file", file);
1662     lose:
1663         if (fd != -1)
1664                 close(fd);
1665         if (zfd != -1 && zfd != STDOUT_FILENO)
1666                 close(zfd);
1667         return -1;
1668 }
1669
1670 static void
1671 check_siginfo(void)
1672 {
1673         if (print_info == 0)
1674                 return;
1675         if (infile) {
1676                 if (infile_total) {
1677                         int pcent = (int)((100.0 * infile_current) / infile_total);
1678
1679                         fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1680                                 infile, (unsigned long long)infile_current,
1681                                 (unsigned long long)infile_total, pcent);
1682                 } else
1683                         fprintf(stderr, "%s: done %llu bytes\n",
1684                                 infile, (unsigned long long)infile_current);
1685         }
1686         print_info = 0;
1687 }
1688
1689 static off_t
1690 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1691 {
1692         char buf[BUFLEN];
1693         off_t in_tot;
1694         ssize_t w;
1695
1696         in_tot = count;
1697         w = write_retry(STDOUT_FILENO, prepend, count);
1698         if (w == -1 || (size_t)w != count) {
1699                 maybe_warn("write to stdout");
1700                 return -1;
1701         }
1702         for (;;) {
1703                 ssize_t rv;
1704
1705                 rv = read(fd, buf, sizeof buf);
1706                 if (rv == 0)
1707                         break;
1708                 if (rv < 0) {
1709                         maybe_warn("read from fd %d", fd);
1710                         break;
1711                 }
1712                 infile_newdata(rv);
1713
1714                 if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1715                         maybe_warn("write to stdout");
1716                         break;
1717                 }
1718                 in_tot += rv;
1719         }
1720
1721         if (gsizep)
1722                 *gsizep = in_tot;
1723         return (in_tot);
1724 }
1725
1726 static void
1727 handle_stdin(void)
1728 {
1729         struct stat isb;
1730         unsigned char fourbytes[4];
1731         size_t in_size;
1732         off_t usize, gsize;
1733         enum filetype method;
1734         ssize_t bytes_read;
1735 #ifndef NO_COMPRESS_SUPPORT
1736         FILE *in;
1737 #endif
1738
1739         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1740                 maybe_warnx("standard input is a terminal -- ignoring");
1741                 goto out;
1742         }
1743
1744         if (fstat(STDIN_FILENO, &isb) < 0) {
1745                 maybe_warn("fstat");
1746                 goto out;
1747         }
1748         if (S_ISREG(isb.st_mode))
1749                 in_size = isb.st_size;
1750         else
1751                 in_size = 0;
1752         infile_set("(stdin)", in_size);
1753
1754         if (lflag) {
1755                 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1756                 goto out;
1757         }
1758
1759         bytes_read = read_retry(STDIN_FILENO, fourbytes, sizeof fourbytes);
1760         if (bytes_read == -1) {
1761                 maybe_warn("can't read stdin");
1762                 goto out;
1763         } else if (bytes_read != sizeof(fourbytes)) {
1764                 maybe_warnx("(stdin): unexpected end of file");
1765                 goto out;
1766         }
1767
1768         method = file_gettype(fourbytes);
1769         switch (method) {
1770         default:
1771                 if (fflag == 0) {
1772                         maybe_warnx("unknown compression format");
1773                         goto out;
1774                 }
1775                 usize = cat_fd(fourbytes, sizeof fourbytes, &gsize, STDIN_FILENO);
1776                 break;
1777         case FT_GZIP:
1778                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1779                               (char *)fourbytes, sizeof fourbytes, &gsize, "(stdin)");
1780                 break;
1781 #ifndef NO_BZIP2_SUPPORT
1782         case FT_BZIP2:
1783                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1784                                 (char *)fourbytes, sizeof fourbytes, &gsize);
1785                 break;
1786 #endif
1787 #ifndef NO_COMPRESS_SUPPORT
1788         case FT_Z:
1789                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1790                         maybe_warnx("zopen of stdin");
1791                         goto out;
1792                 }
1793
1794                 usize = zuncompress(in, stdout, (char *)fourbytes,
1795                     sizeof fourbytes, &gsize);
1796                 fclose(in);
1797                 break;
1798 #endif
1799 #ifndef NO_PACK_SUPPORT
1800         case FT_PACK:
1801                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1802                                (char *)fourbytes, sizeof fourbytes, &gsize);
1803                 break;
1804 #endif
1805 #ifndef NO_XZ_SUPPORT
1806         case FT_XZ:
1807                 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1808                              (char *)fourbytes, sizeof fourbytes, &gsize);
1809                 break;
1810 #endif
1811 #ifndef NO_LZ_SUPPORT
1812         case FT_LZ:
1813                 usize = unlz(STDIN_FILENO, STDOUT_FILENO,
1814                              (char *)fourbytes, sizeof fourbytes, &gsize);
1815                 break;
1816 #endif
1817         }
1818
1819         if (vflag && !tflag && usize != -1 && gsize != -1)
1820                 print_verbage(NULL, NULL, usize, gsize);
1821         if (vflag && tflag)
1822                 print_test("(stdin)", usize != -1);
1823
1824 out:
1825         infile_clear();
1826 }
1827
1828 static void
1829 handle_stdout(void)
1830 {
1831         off_t gsize;
1832         off_t usize;
1833         struct stat sb;
1834         time_t systime;
1835         uint32_t mtime;
1836         int ret;
1837
1838         infile_set("(stdout)", 0);
1839
1840         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1841                 maybe_warnx("standard output is a terminal -- ignoring");
1842                 return;
1843         }
1844
1845         /* If stdin is a file use its mtime, otherwise use current time */
1846         ret = fstat(STDIN_FILENO, &sb);
1847         if (ret < 0) {
1848                 maybe_warn("Can't stat stdin");
1849                 return;
1850         }
1851
1852         if (S_ISREG(sb.st_mode)) {
1853                 infile_set("(stdout)", sb.st_size);
1854                 mtime = (uint32_t)sb.st_mtime;
1855         } else {
1856                 systime = time(NULL);
1857                 if (systime == -1) {
1858                         maybe_warn("time");
1859                         return;
1860                 }
1861                 mtime = (uint32_t)systime;
1862         }
1863
1864         usize =
1865                 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1866         if (vflag && !tflag && usize != -1 && gsize != -1)
1867                 print_verbage(NULL, NULL, usize, gsize);
1868 }
1869
1870 /* do what is asked for, for the path name */
1871 static void
1872 handle_pathname(char *path)
1873 {
1874         char *opath = path, *s = NULL;
1875         ssize_t len;
1876         int slen;
1877         struct stat sb;
1878
1879         /* check for stdout/stdin */
1880         if (path[0] == '-' && path[1] == '\0') {
1881                 if (dflag)
1882                         handle_stdin();
1883                 else
1884                         handle_stdout();
1885                 return;
1886         }
1887
1888 retry:
1889         if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1890             lstat(path, &sb) != 0)) {
1891                 /* lets try <path>.gz if we're decompressing */
1892                 if (dflag && s == NULL && errno == ENOENT) {
1893                         len = strlen(path);
1894                         slen = suffixes[0].ziplen;
1895                         s = malloc(len + slen + 1);
1896                         if (s == NULL)
1897                                 maybe_err("malloc");
1898                         memcpy(s, path, len);
1899                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1900                         path = s;
1901                         goto retry;
1902                 }
1903                 maybe_warn("can't stat: %s", opath);
1904                 goto out;
1905         }
1906
1907         if (S_ISDIR(sb.st_mode)) {
1908                 if (rflag)
1909                         handle_dir(path);
1910                 else
1911                         maybe_warnx("%s is a directory", path);
1912                 goto out;
1913         }
1914
1915         if (S_ISREG(sb.st_mode))
1916                 handle_file(path, &sb);
1917         else
1918                 maybe_warnx("%s is not a regular file", path);
1919
1920 out:
1921         if (s)
1922                 free(s);
1923 }
1924
1925 /* compress/decompress a file */
1926 static void
1927 handle_file(char *file, struct stat *sbp)
1928 {
1929         off_t usize, gsize;
1930         char    outfile[PATH_MAX];
1931
1932         infile_set(file, sbp->st_size);
1933         if (dflag) {
1934                 usize = file_uncompress(file, outfile, sizeof(outfile));
1935                 if (vflag && tflag)
1936                         print_test(file, usize != -1);
1937                 if (usize == -1)
1938                         return;
1939                 gsize = sbp->st_size;
1940         } else {
1941                 gsize = file_compress(file, outfile, sizeof(outfile));
1942                 if (gsize == -1)
1943                         return;
1944                 usize = sbp->st_size;
1945         }
1946         infile_clear();
1947
1948         if (vflag && !tflag)
1949                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1950 }
1951
1952 /* this is used with -r to recursively descend directories */
1953 static void
1954 handle_dir(char *dir)
1955 {
1956         char *path_argv[2];
1957         FTS *fts;
1958         FTSENT *entry;
1959
1960         path_argv[0] = dir;
1961         path_argv[1] = 0;
1962         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
1963         if (fts == NULL) {
1964                 warn("couldn't fts_open %s", dir);
1965                 return;
1966         }
1967
1968         while (errno = 0, (entry = fts_read(fts))) {
1969                 switch(entry->fts_info) {
1970                 case FTS_D:
1971                 case FTS_DP:
1972                         continue;
1973
1974                 case FTS_DNR:
1975                 case FTS_ERR:
1976                 case FTS_NS:
1977                         maybe_warn("%s", entry->fts_path);
1978                         continue;
1979                 case FTS_F:
1980                         handle_file(entry->fts_path, entry->fts_statp);
1981                 }
1982         }
1983         if (errno != 0)
1984                 warn("error with fts_read %s", dir);
1985         (void)fts_close(fts);
1986 }
1987
1988 /* print a ratio - size reduction as a fraction of uncompressed size */
1989 static void
1990 print_ratio(off_t in, off_t out, FILE *where)
1991 {
1992         int percent10;  /* 10 * percent */
1993         off_t diff;
1994         char buff[8];
1995         int len;
1996
1997         diff = in - out/2;
1998         if (in == 0 && out == 0)
1999                 percent10 = 0;
2000         else if (diff < 0)
2001                 /*
2002                  * Output is more than double size of input! print -99.9%
2003                  * Quite possibly we've failed to get the original size.
2004                  */
2005                 percent10 = -999;
2006         else {
2007                 /*
2008                  * We only need 12 bits of result from the final division,
2009                  * so reduce the values until a 32bit division will suffice.
2010                  */
2011                 while (in > 0x100000) {
2012                         diff >>= 1;
2013                         in >>= 1;
2014                 }
2015                 if (in != 0)
2016                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2017                 else
2018                         percent10 = 0;
2019         }
2020
2021         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2022         /* Move the '.' to before the last digit */
2023         buff[len - 1] = buff[len - 2];
2024         buff[len - 2] = '.';
2025         fprintf(where, "%5s%%", buff);
2026 }
2027
2028 /* print compression statistics, and the new name (if there is one!) */
2029 static void
2030 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2031 {
2032         if (file)
2033                 fprintf(stderr, "%s:%s  ", file,
2034                     strlen(file) < 7 ? "\t\t" : "\t");
2035         print_ratio(usize, gsize, stderr);
2036         if (nfile)
2037                 fprintf(stderr, " -- replaced with %s", nfile);
2038         fprintf(stderr, "\n");
2039         fflush(stderr);
2040 }
2041
2042 /* print test results */
2043 static void
2044 print_test(const char *file, int ok)
2045 {
2046
2047         if (exit_value == 0 && ok == 0)
2048                 exit_value = 1;
2049         fprintf(stderr, "%s:%s  %s\n", file,
2050             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2051         fflush(stderr);
2052 }
2053
2054 /* print a file's info ala --list */
2055 /* eg:
2056   compressed uncompressed  ratio uncompressed_name
2057       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2058 */
2059 static void
2060 print_list(int fd, off_t out, const char *outfile, time_t ts)
2061 {
2062         static int first = 1;
2063         static off_t in_tot, out_tot;
2064         uint32_t crc = 0;
2065         off_t in = 0, rv;
2066
2067         if (first) {
2068                 if (vflag)
2069                         printf("method  crc     date  time  ");
2070                 if (qflag == 0)
2071                         printf("  compressed uncompressed  "
2072                                "ratio uncompressed_name\n");
2073         }
2074         first = 0;
2075
2076         /* print totals? */
2077         if (fd == -1) {
2078                 in = in_tot;
2079                 out = out_tot;
2080         } else
2081         {
2082                 /* read the last 4 bytes - this is the uncompressed size */
2083                 rv = lseek(fd, (off_t)(-8), SEEK_END);
2084                 if (rv != -1) {
2085                         unsigned char buf[8];
2086                         uint32_t usize;
2087
2088                         rv = read(fd, (char *)buf, sizeof(buf));
2089                         if (rv == -1)
2090                                 maybe_warn("read of uncompressed size");
2091                         else if (rv != sizeof(buf))
2092                                 maybe_warnx("read of uncompressed size");
2093
2094                         else {
2095                                 usize = le32dec(&buf[4]);
2096                                 in = (off_t)usize;
2097                                 crc = le32dec(&buf[0]);
2098                         }
2099                 }
2100         }
2101
2102         if (vflag && fd == -1)
2103                 printf("                            ");
2104         else if (vflag) {
2105                 char *date = ctime(&ts);
2106
2107                 /* skip the day, 1/100th second, and year */
2108                 date += 4;
2109                 date[12] = 0;
2110                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2111         }
2112         in_tot += in;
2113         out_tot += out;
2114         print_list_out(out, in, outfile);
2115 }
2116
2117 static void
2118 print_list_out(off_t out, off_t in, const char *outfile)
2119 {
2120         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2121         print_ratio(in, out, stdout);
2122         printf(" %s\n", outfile);
2123 }
2124
2125 /* display the usage of NetBSD gzip */
2126 static void
2127 usage(void)
2128 {
2129
2130         fprintf(stderr, "%s\n", gzip_version);
2131         fprintf(stderr,
2132     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2133     " -1 --fast            fastest (worst) compression\n"
2134     " -2 .. -8             set compression level\n"
2135     " -9 --best            best (slowest) compression\n"
2136     " -c --stdout          write to stdout, keep original files\n"
2137     "    --to-stdout\n"
2138     " -d --decompress      uncompress files\n"
2139     "    --uncompress\n"
2140     " -f --force           force overwriting & compress links\n"
2141     " -h --help            display this help\n"
2142     " -k --keep            don't delete input files during operation\n"
2143     " -l --list            list compressed file contents\n"
2144     " -N --name            save or restore original file name and time stamp\n"
2145     " -n --no-name         don't save original file name or time stamp\n"
2146     " -q --quiet           output no warnings\n"
2147     " -r --recursive       recursively compress files in directories\n"
2148     " -S .suf              use suffix .suf instead of .gz\n"
2149     "    --suffix .suf\n"
2150     " -t --test            test compressed file\n"
2151     " -V --version         display program version\n"
2152     " -v --verbose         print extra statistics\n",
2153             getprogname());
2154         exit(0);
2155 }
2156
2157 /* display the license information of FreeBSD gzip */
2158 static void
2159 display_license(void)
2160 {
2161
2162         fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2163         fprintf(stderr, "%s\n", gzip_copyright);
2164         exit(0);
2165 }
2166
2167 /* display the version of NetBSD gzip */
2168 static void
2169 display_version(void)
2170 {
2171
2172         fprintf(stderr, "%s\n", gzip_version);
2173         exit(0);
2174 }
2175
2176 #ifndef NO_BZIP2_SUPPORT
2177 #include "unbzip2.c"
2178 #endif
2179 #ifndef NO_COMPRESS_SUPPORT
2180 #include "zuncompress.c"
2181 #endif
2182 #ifndef NO_PACK_SUPPORT
2183 #include "unpack.c"
2184 #endif
2185 #ifndef NO_XZ_SUPPORT
2186 #include "unxz.c"
2187 #endif
2188 #ifndef NO_LZ_SUPPORT
2189 #include "unlz.c"
2190 #endif
2191
2192 static ssize_t
2193 read_retry(int fd, void *buf, size_t sz)
2194 {
2195         char *cp = buf;
2196         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2197
2198         while (left > 0) {
2199                 ssize_t ret;
2200
2201                 ret = read(fd, cp, left);
2202                 if (ret == -1) {
2203                         return ret;
2204                 } else if (ret == 0) {
2205                         break; /* EOF */
2206                 }
2207                 cp += ret;
2208                 left -= ret;
2209         }
2210
2211         return sz - left;
2212 }
2213
2214 static ssize_t
2215 write_retry(int fd, const void *buf, size_t sz)
2216 {
2217         const char *cp = buf;
2218         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2219
2220         while (left > 0) {
2221                 ssize_t ret;
2222
2223                 ret = write(fd, cp, left);
2224                 if (ret == -1) {
2225                         return ret;
2226                 } else if (ret == 0) {
2227                         abort();        /* Can't happen */
2228                 }
2229                 cp += ret;
2230                 left -= ret;
2231         }
2232
2233         return sz - left;
2234 }