usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.113 2018/06/12 00:42:17 kamil Exp $ */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
   5  *
   6  * Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008, 2009, 2010, 2011, 2015, 2017
   7  *    Matthew R. Green
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  */
  32
  33 #include <sys/cdefs.h>
  34 #ifndef lint
  35 __COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004, 2006, 2008,\
  36  2009, 2010, 2011, 2015, 2017 Matthew R. Green.  All rights reserved.");
  37 __FBSDID("$FreeBSD$");
  38 #endif /* not lint */
  39
  40 /*
  41  * gzip.c -- GPL free gzip using zlib.
  42  *
  43  * RFC 1950 covers the zlib format
  44  * RFC 1951 covers the deflate format
  45  * RFC 1952 covers the gzip format
  46  *
  47  * TODO:
  48  *      - use mmap where possible
  49  *      - make bzip2/compress -v/-t/-l support work as well as possible
  50  */
  51
  52 #include <sys/endian.h>
  53 #include <sys/param.h>
  54 #include <sys/stat.h>
  55 #include <sys/time.h>
  56
  57 #include <inttypes.h>
  58 #include <unistd.h>
  59 #include <stdio.h>
  60 #include <string.h>
  61 #include <stdlib.h>
  62 #include <err.h>
  63 #include <errno.h>
  64 #include <fcntl.h>
  65 #include <zlib.h>
  66 #include <fts.h>
  67 #include <libgen.h>
  68 #include <stdarg.h>
  69 #include <getopt.h>
  70 #include <time.h>
  71
  72 /* what type of file are we dealing with */
  73 enum filetype {
  74         FT_GZIP,
  75 #ifndef NO_BZIP2_SUPPORT
  76         FT_BZIP2,
  77 #endif
  78 #ifndef NO_COMPRESS_SUPPORT
  79         FT_Z,
  80 #endif
  81 #ifndef NO_PACK_SUPPORT
  82         FT_PACK,
  83 #endif
  84 #ifndef NO_XZ_SUPPORT
  85         FT_XZ,
  86 #endif
  87         FT_LAST,
  88         FT_UNKNOWN
  89 };
  90
  91 #ifndef NO_BZIP2_SUPPORT
  92 #include <bzlib.h>
  93
  94 #define BZ2_SUFFIX      ".bz2"
  95 #define BZIP2_MAGIC     "BZh"
  96 #endif
  97
  98 #ifndef NO_COMPRESS_SUPPORT
  99 #define Z_SUFFIX        ".Z"
 100 #define Z_MAGIC         "\037\235"
 101 #endif
 102
 103 #ifndef NO_PACK_SUPPORT
 104 #define PACK_MAGIC      "\037\036"
 105 #endif
 106
 107 #ifndef NO_XZ_SUPPORT
 108 #include <lzma.h>
 109 #define XZ_SUFFIX       ".xz"
 110 #define XZ_MAGIC        "\3757zXZ"
 111 #endif
 112
 113 #define GZ_SUFFIX       ".gz"
 114
 115 #define BUFLEN          (64 * 1024)
 116
 117 #define GZIP_MAGIC0     0x1F
 118 #define GZIP_MAGIC1     0x8B
 119 #define GZIP_OMAGIC1    0x9E
 120
 121 #define GZIP_TIMESTAMP  (off_t)4
 122 #define GZIP_ORIGNAME   (off_t)10
 123
 124 #define HEAD_CRC        0x02
 125 #define EXTRA_FIELD     0x04
 126 #define ORIG_NAME       0x08
 127 #define COMMENT         0x10
 128
 129 #define OS_CODE         3       /* Unix */
 130
 131 typedef struct {
 132     const char  *zipped;
 133     int         ziplen;
 134     const char  *normal;        /* for unzip - must not be longer than zipped */
 135 } suffixes_t;
 136 static suffixes_t suffixes[] = {
 137 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 138         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 139 #ifndef SMALL
 140         SUFFIX(GZ_SUFFIX,       ""),
 141         SUFFIX(".z",            ""),
 142         SUFFIX("-gz",           ""),
 143         SUFFIX("-z",            ""),
 144         SUFFIX("_z",            ""),
 145         SUFFIX(".taz",          ".tar"),
 146         SUFFIX(".tgz",          ".tar"),
 147 #ifndef NO_BZIP2_SUPPORT
 148         SUFFIX(BZ2_SUFFIX,      ""),
 149         SUFFIX(".tbz",          ".tar"),
 150         SUFFIX(".tbz2",         ".tar"),
 151 #endif
 152 #ifndef NO_COMPRESS_SUPPORT
 153         SUFFIX(Z_SUFFIX,        ""),
 154 #endif
 155 #ifndef NO_XZ_SUPPORT
 156         SUFFIX(XZ_SUFFIX,       ""),
 157 #endif
 158         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 159 #endif /* SMALL */
 160 #undef SUFFIX
 161 };
 162 #define NUM_SUFFIXES (nitems(suffixes))
 163 #define SUFFIX_MAXLEN   30
 164
 165 static  const char      gzip_version[] = "FreeBSD gzip 20171121";
 166
 167 #ifndef SMALL
 168 static  const char      gzip_copyright[] = \
 169 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
 170 "   All rights reserved.\n"
 171 "\n"
 172 "   Redistribution and use in source and binary forms, with or without\n"
 173 "   modification, are permitted provided that the following conditions\n"
 174 "   are met:\n"
 175 "   1. Redistributions of source code must retain the above copyright\n"
 176 "      notice, this list of conditions and the following disclaimer.\n"
 177 "   2. Redistributions in binary form must reproduce the above copyright\n"
 178 "      notice, this list of conditions and the following disclaimer in the\n"
 179 "      documentation and/or other materials provided with the distribution.\n"
 180 "\n"
 181 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
 182 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
 183 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
 184 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
 185 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
 186 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
 187 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
 188 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
 189 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
 190 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
 191 "   SUCH DAMAGE.";
 192 #endif
 193
 194 static  int     cflag;                  /* stdout mode */
 195 static  int     dflag;                  /* decompress mode */
 196 static  int     lflag;                  /* list mode */
 197 static  int     numflag = 6;            /* gzip -1..-9 value */
 198
 199 static  const char *remove_file = NULL; /* file to be removed upon SIGINT */
 200
 201 static  int     fflag;                  /* force mode */
 202 #ifndef SMALL
 203 static  int     kflag;                  /* don't delete input files */
 204 static  int     nflag;                  /* don't save name/timestamp */
 205 static  int     Nflag;                  /* don't restore name/timestamp */
 206 static  int     qflag;                  /* quiet mode */
 207 static  int     rflag;                  /* recursive mode */
 208 static  int     tflag;                  /* test */
 209 static  int     vflag;                  /* verbose mode */
 210 static  sig_atomic_t print_info = 0;
 211 #else
 212 #define         qflag   0
 213 #define         tflag   0
 214 #endif
 215
 216 static  int     exit_value = 0;         /* exit value */
 217
 218 static  const char *infile;             /* name of file coming in */
 219
 220 static  void    maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
 221 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 222     !defined(NO_XZ_SUPPORT)
 223 static  void    maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
 224 #endif
 225 static  void    maybe_warn(const char *fmt, ...) __printflike(1, 2);
 226 static  void    maybe_warnx(const char *fmt, ...) __printflike(1, 2);
 227 static  enum filetype file_gettype(u_char *);
 228 #ifdef SMALL
 229 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 230 #endif
 231 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 232 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 233 static  off_t   file_compress(char *, char *, size_t);
 234 static  off_t   file_uncompress(char *, char *, size_t);
 235 static  void    handle_pathname(char *);
 236 static  void    handle_file(char *, struct stat *);
 237 static  void    handle_stdin(void);
 238 static  void    handle_stdout(void);
 239 static  void    print_ratio(off_t, off_t, FILE *);
 240 static  void    print_list(int fd, off_t, const char *, time_t);
 241 static  void    usage(void) __dead2;
 242 static  void    display_version(void) __dead2;
 243 #ifndef SMALL
 244 static  void    display_license(void);
 245 #endif
 246 static  const suffixes_t *check_suffix(char *, int);
 247 static  ssize_t read_retry(int, void *, size_t);
 248 static  ssize_t write_retry(int, const void *, size_t);
 249
 250 #ifdef SMALL
 251 #define infile_set(f,t) infile_set(f)
 252 #endif
 253 static  void    infile_set(const char *newinfile, off_t total);
 254
 255 #ifdef SMALL
 256 #define unlink_input(f, sb) unlink(f)
 257 #define check_siginfo() /* nothing */
 258 #define setup_signals() /* nothing */
 259 #define infile_newdata(t) /* nothing */
 260 #else
 261 static  off_t   infile_total;           /* total expected to read/write */
 262 static  off_t   infile_current;         /* current read/write */
 263
 264 static  void    check_siginfo(void);
 265 static  off_t   cat_fd(unsigned char *, size_t, off_t *, int fd);
 266 static  void    prepend_gzip(char *, int *, char ***);
 267 static  void    handle_dir(char *);
 268 static  void    print_verbage(const char *, const char *, off_t, off_t);
 269 static  void    print_test(const char *, int);
 270 static  void    copymodes(int fd, const struct stat *, const char *file);
 271 static  int     check_outfile(const char *outfile);
 272 static  void    setup_signals(void);
 273 static  void    infile_newdata(size_t newdata);
 274 static  void    infile_clear(void);
 275 #endif
 276
 277 #ifndef NO_BZIP2_SUPPORT
 278 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 279 #endif
 280
 281 #ifndef NO_COMPRESS_SUPPORT
 282 static  FILE    *zdopen(int);
 283 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 284 #endif
 285
 286 #ifndef NO_PACK_SUPPORT
 287 static  off_t   unpack(int, int, char *, size_t, off_t *);
 288 #endif
 289
 290 #ifndef NO_XZ_SUPPORT
 291 static  off_t   unxz(int, int, char *, size_t, off_t *);
 292 #endif
 293
 294 #ifdef SMALL
 295 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 296 #else
 297 static const struct option longopts[] = {
 298         { "stdout",             no_argument,            0,      'c' },
 299         { "to-stdout",          no_argument,            0,      'c' },
 300         { "decompress",         no_argument,            0,      'd' },
 301         { "uncompress",         no_argument,            0,      'd' },
 302         { "force",              no_argument,            0,      'f' },
 303         { "help",               no_argument,            0,      'h' },
 304         { "keep",               no_argument,            0,      'k' },
 305         { "list",               no_argument,            0,      'l' },
 306         { "no-name",            no_argument,            0,      'n' },
 307         { "name",               no_argument,            0,      'N' },
 308         { "quiet",              no_argument,            0,      'q' },
 309         { "recursive",          no_argument,            0,      'r' },
 310         { "suffix",             required_argument,      0,      'S' },
 311         { "test",               no_argument,            0,      't' },
 312         { "verbose",            no_argument,            0,      'v' },
 313         { "version",            no_argument,            0,      'V' },
 314         { "fast",               no_argument,            0,      '1' },
 315         { "best",               no_argument,            0,      '9' },
 316         { "ascii",              no_argument,            0,      'a' },
 317         { "license",            no_argument,            0,      'L' },
 318         { NULL,                 no_argument,            0,      0 },
 319 };
 320 #endif
 321
 322 int
 323 main(int argc, char **argv)
 324 {
 325         const char *progname = getprogname();
 326 #ifndef SMALL
 327         char *gzip;
 328         int len;
 329 #endif
 330         int ch;
 331
 332         setup_signals();
 333
 334 #ifndef SMALL
 335         if ((gzip = getenv("GZIP")) != NULL)
 336                 prepend_gzip(gzip, &argc, &argv);
 337 #endif
 338
 339         /*
 340          * XXX
 341          * handle being called `gunzip', `zcat' and `gzcat'
 342          */
 343         if (strcmp(progname, "gunzip") == 0)
 344                 dflag = 1;
 345         else if (strcmp(progname, "zcat") == 0 ||
 346                  strcmp(progname, "gzcat") == 0)
 347                 dflag = cflag = 1;
 348
 349 #ifdef SMALL
 350 #define OPT_LIST "123456789cdhlV"
 351 #else
 352 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
 353 #endif
 354
 355         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 356                 switch (ch) {
 357                 case '1': case '2': case '3':
 358                 case '4': case '5': case '6':
 359                 case '7': case '8': case '9':
 360                         numflag = ch - '0';
 361                         break;
 362                 case 'c':
 363                         cflag = 1;
 364                         break;
 365                 case 'd':
 366                         dflag = 1;
 367                         break;
 368                 case 'l':
 369                         lflag = 1;
 370                         dflag = 1;
 371                         break;
 372                 case 'V':
 373                         display_version();
 374                         /* NOTREACHED */
 375 #ifndef SMALL
 376                 case 'a':
 377                         fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
 378                         break;
 379                 case 'f':
 380                         fflag = 1;
 381                         break;
 382                 case 'k':
 383                         kflag = 1;
 384                         break;
 385                 case 'L':
 386                         display_license();
 387                         /* NOT REACHED */
 388                 case 'N':
 389                         nflag = 0;
 390                         Nflag = 1;
 391                         break;
 392                 case 'n':
 393                         nflag = 1;
 394                         Nflag = 0;
 395                         break;
 396                 case 'q':
 397                         qflag = 1;
 398                         break;
 399                 case 'r':
 400                         rflag = 1;
 401                         break;
 402                 case 'S':
 403                         len = strlen(optarg);
 404                         if (len != 0) {
 405                                 if (len > SUFFIX_MAXLEN)
 406                                         errx(1, "incorrect suffix: '%s': too long", optarg);
 407                                 suffixes[0].zipped = optarg;
 408                                 suffixes[0].ziplen = len;
 409                         } else {
 410                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 411                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 412                         }
 413                         break;
 414                 case 't':
 415                         cflag = 1;
 416                         tflag = 1;
 417                         dflag = 1;
 418                         break;
 419                 case 'v':
 420                         vflag = 1;
 421                         break;
 422 #endif
 423                 default:
 424                         usage();
 425                         /* NOTREACHED */
 426                 }
 427         }
 428         argv += optind;
 429         argc -= optind;
 430
 431         if (argc == 0) {
 432                 if (dflag)      /* stdin mode */
 433                         handle_stdin();
 434                 else            /* stdout mode */
 435                         handle_stdout();
 436         } else {
 437                 do {
 438                         handle_pathname(argv[0]);
 439                 } while (*++argv);
 440         }
 441 #ifndef SMALL
 442         if (qflag == 0 && lflag && argc > 1)
 443                 print_list(-1, 0, "(totals)", 0);
 444 #endif
 445         exit(exit_value);
 446 }
 447
 448 /* maybe print a warning */
 449 void
 450 maybe_warn(const char *fmt, ...)
 451 {
 452         va_list ap;
 453
 454         if (qflag == 0) {
 455                 va_start(ap, fmt);
 456                 vwarn(fmt, ap);
 457                 va_end(ap);
 458         }
 459         if (exit_value == 0)
 460                 exit_value = 1;
 461 }
 462
 463 /* ... without an errno. */
 464 void
 465 maybe_warnx(const char *fmt, ...)
 466 {
 467         va_list ap;
 468
 469         if (qflag == 0) {
 470                 va_start(ap, fmt);
 471                 vwarnx(fmt, ap);
 472                 va_end(ap);
 473         }
 474         if (exit_value == 0)
 475                 exit_value = 1;
 476 }
 477
 478 /* maybe print an error */
 479 void
 480 maybe_err(const char *fmt, ...)
 481 {
 482         va_list ap;
 483
 484         if (qflag == 0) {
 485                 va_start(ap, fmt);
 486                 vwarn(fmt, ap);
 487                 va_end(ap);
 488         }
 489         exit(2);
 490 }
 491
 492 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 493     !defined(NO_XZ_SUPPORT)
 494 /* ... without an errno. */
 495 void
 496 maybe_errx(const char *fmt, ...)
 497 {
 498         va_list ap;
 499
 500         if (qflag == 0) {
 501                 va_start(ap, fmt);
 502                 vwarnx(fmt, ap);
 503                 va_end(ap);
 504         }
 505         exit(2);
 506 }
 507 #endif
 508
 509 #ifndef SMALL
 510 /* split up $GZIP and prepend it to the argument list */
 511 static void
 512 prepend_gzip(char *gzip, int *argc, char ***argv)
 513 {
 514         char *s, **nargv, **ac;
 515         int nenvarg = 0, i;
 516
 517         /* scan how many arguments there are */
 518         for (s = gzip;;) {
 519                 while (*s == ' ' || *s == '\t')
 520                         s++;
 521                 if (*s == 0)
 522                         goto count_done;
 523                 nenvarg++;
 524                 while (*s != ' ' && *s != '\t')
 525                         if (*s++ == 0)
 526                                 goto count_done;
 527         }
 528 count_done:
 529         /* punt early */
 530         if (nenvarg == 0)
 531                 return;
 532
 533         *argc += nenvarg;
 534         ac = *argv;
 535
 536         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 537         if (nargv == NULL)
 538                 maybe_err("malloc");
 539
 540         /* stash this away */
 541         *argv = nargv;
 542
 543         /* copy the program name first */
 544         i = 0;
 545         nargv[i++] = *(ac++);
 546
 547         /* take a copy of $GZIP and add it to the array */
 548         s = strdup(gzip);
 549         if (s == NULL)
 550                 maybe_err("strdup");
 551         for (;;) {
 552                 /* Skip whitespaces. */
 553                 while (*s == ' ' || *s == '\t')
 554                         s++;
 555                 if (*s == 0)
 556                         goto copy_done;
 557                 nargv[i++] = s;
 558                 /* Find the end of this argument. */
 559                 while (*s != ' ' && *s != '\t')
 560                         if (*s++ == 0)
 561                                 /* Argument followed by NUL. */
 562                                 goto copy_done;
 563                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 564                 *s++ = 0;
 565         }
 566 copy_done:
 567
 568         /* copy the original arguments and a NULL */
 569         while (*ac)
 570                 nargv[i++] = *(ac++);
 571         nargv[i] = NULL;
 572 }
 573 #endif
 574
 575 /* compress input to output. Return bytes read, -1 on error */
 576 static off_t
 577 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 578 {
 579         z_stream z;
 580         char *outbufp, *inbufp;
 581         off_t in_tot = 0, out_tot = 0;
 582         ssize_t in_size;
 583         int i, error;
 584         uLong crc;
 585 #ifdef SMALL
 586         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 587                                  0, 0, 0, 0,
 588                                  0, OS_CODE };
 589 #endif
 590
 591         outbufp = malloc(BUFLEN);
 592         inbufp = malloc(BUFLEN);
 593         if (outbufp == NULL || inbufp == NULL) {
 594                 maybe_err("malloc failed");
 595                 goto out;
 596         }
 597
 598         memset(&z, 0, sizeof z);
 599         z.zalloc = Z_NULL;
 600         z.zfree = Z_NULL;
 601         z.opaque = 0;
 602
 603 #ifdef SMALL
 604         memcpy(outbufp, header, sizeof header);
 605         i = sizeof header;
 606 #else
 607         if (nflag != 0) {
 608                 mtime = 0;
 609                 origname = "";
 610         }
 611
 612         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 613                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 614                      *origname ? ORIG_NAME : 0,
 615                      mtime & 0xff,
 616                      (mtime >> 8) & 0xff,
 617                      (mtime >> 16) & 0xff,
 618                      (mtime >> 24) & 0xff,
 619                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 620                      OS_CODE, origname);
 621         if (i >= BUFLEN)
 622                 /* this need PATH_MAX > BUFLEN ... */
 623                 maybe_err("snprintf");
 624         if (*origname)
 625                 i++;
 626 #endif
 627
 628         z.next_out = (unsigned char *)outbufp + i;
 629         z.avail_out = BUFLEN - i;
 630
 631         error = deflateInit2(&z, numflag, Z_DEFLATED,
 632                              (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
 633         if (error != Z_OK) {
 634                 maybe_warnx("deflateInit2 failed");
 635                 in_tot = -1;
 636                 goto out;
 637         }
 638
 639         crc = crc32(0L, Z_NULL, 0);
 640         for (;;) {
 641                 if (z.avail_out == 0) {
 642                         if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
 643                                 maybe_warn("write");
 644                                 out_tot = -1;
 645                                 goto out;
 646                         }
 647
 648                         out_tot += BUFLEN;
 649                         z.next_out = (unsigned char *)outbufp;
 650                         z.avail_out = BUFLEN;
 651                 }
 652
 653                 if (z.avail_in == 0) {
 654                         in_size = read(in, inbufp, BUFLEN);
 655                         if (in_size < 0) {
 656                                 maybe_warn("read");
 657                                 in_tot = -1;
 658                                 goto out;
 659                         }
 660                         if (in_size == 0)
 661                                 break;
 662                         infile_newdata(in_size);
 663
 664                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 665                         in_tot += in_size;
 666                         z.next_in = (unsigned char *)inbufp;
 667                         z.avail_in = in_size;
 668                 }
 669
 670                 error = deflate(&z, Z_NO_FLUSH);
 671                 if (error != Z_OK && error != Z_STREAM_END) {
 672                         maybe_warnx("deflate failed");
 673                         in_tot = -1;
 674                         goto out;
 675                 }
 676         }
 677
 678         /* clean up */
 679         for (;;) {
 680                 size_t len;
 681                 ssize_t w;
 682
 683                 error = deflate(&z, Z_FINISH);
 684                 if (error != Z_OK && error != Z_STREAM_END) {
 685                         maybe_warnx("deflate failed");
 686                         in_tot = -1;
 687                         goto out;
 688                 }
 689
 690                 len = (char *)z.next_out - outbufp;
 691
 692                 w = write_retry(out, outbufp, len);
 693                 if (w == -1 || (size_t)w != len) {
 694                         maybe_warn("write");
 695                         out_tot = -1;
 696                         goto out;
 697                 }
 698                 out_tot += len;
 699                 z.next_out = (unsigned char *)outbufp;
 700                 z.avail_out = BUFLEN;
 701
 702                 if (error == Z_STREAM_END)
 703                         break;
 704         }
 705
 706         if (deflateEnd(&z) != Z_OK) {
 707                 maybe_warnx("deflateEnd failed");
 708                 in_tot = -1;
 709                 goto out;
 710         }
 711
 712         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 713                  (int)crc & 0xff,
 714                  (int)(crc >> 8) & 0xff,
 715                  (int)(crc >> 16) & 0xff,
 716                  (int)(crc >> 24) & 0xff,
 717                  (int)in_tot & 0xff,
 718                  (int)(in_tot >> 8) & 0xff,
 719                  (int)(in_tot >> 16) & 0xff,
 720                  (int)(in_tot >> 24) & 0xff);
 721         if (i != 8)
 722                 maybe_err("snprintf");
 723         if (write_retry(out, outbufp, i) != i) {
 724                 maybe_warn("write");
 725                 in_tot = -1;
 726         } else
 727                 out_tot += i;
 728
 729 out:
 730         if (inbufp != NULL)
 731                 free(inbufp);
 732         if (outbufp != NULL)
 733                 free(outbufp);
 734         if (gsizep)
 735                 *gsizep = out_tot;
 736         return in_tot;
 737 }
 738
 739 /*
 740  * uncompress input to output then close the input.  return the
 741  * uncompressed size written, and put the compressed sized read
 742  * into `*gsizep'.
 743  */
 744 static off_t
 745 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 746               const char *filename)
 747 {
 748         z_stream z;
 749         char *outbufp, *inbufp;
 750         off_t out_tot = -1, in_tot = 0;
 751         uint32_t out_sub_tot = 0;
 752         enum {
 753                 GZSTATE_MAGIC0,
 754                 GZSTATE_MAGIC1,
 755                 GZSTATE_METHOD,
 756                 GZSTATE_FLAGS,
 757                 GZSTATE_SKIPPING,
 758                 GZSTATE_EXTRA,
 759                 GZSTATE_EXTRA2,
 760                 GZSTATE_EXTRA3,
 761                 GZSTATE_ORIGNAME,
 762                 GZSTATE_COMMENT,
 763                 GZSTATE_HEAD_CRC1,
 764                 GZSTATE_HEAD_CRC2,
 765                 GZSTATE_INIT,
 766                 GZSTATE_READ,
 767                 GZSTATE_CRC,
 768                 GZSTATE_LEN,
 769         } state = GZSTATE_MAGIC0;
 770         int flags = 0, skip_count = 0;
 771         int error = Z_STREAM_ERROR, done_reading = 0;
 772         uLong crc = 0;
 773         ssize_t wr;
 774         int needmore = 0;
 775
 776 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 777
 778         if ((outbufp = malloc(BUFLEN)) == NULL) {
 779                 maybe_err("malloc failed");
 780                 goto out2;
 781         }
 782         if ((inbufp = malloc(BUFLEN)) == NULL) {
 783                 maybe_err("malloc failed");
 784                 goto out1;
 785         }
 786
 787         memset(&z, 0, sizeof z);
 788         z.avail_in = prelen;
 789         z.next_in = (unsigned char *)pre;
 790         z.avail_out = BUFLEN;
 791         z.next_out = (unsigned char *)outbufp;
 792         z.zalloc = NULL;
 793         z.zfree = NULL;
 794         z.opaque = 0;
 795
 796         in_tot = prelen;
 797         out_tot = 0;
 798
 799         for (;;) {
 800                 check_siginfo();
 801                 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
 802                         ssize_t in_size;
 803
 804                         if (z.avail_in > 0) {
 805                                 memmove(inbufp, z.next_in, z.avail_in);
 806                         }
 807                         z.next_in = (unsigned char *)inbufp;
 808                         in_size = read(in, z.next_in + z.avail_in,
 809                             BUFLEN - z.avail_in);
 810
 811                         if (in_size == -1) {
 812                                 maybe_warn("failed to read stdin");
 813                                 goto stop_and_fail;
 814                         } else if (in_size == 0) {
 815                                 done_reading = 1;
 816                         }
 817                         infile_newdata(in_size);
 818
 819                         z.avail_in += in_size;
 820                         needmore = 0;
 821
 822                         in_tot += in_size;
 823                 }
 824                 if (z.avail_in == 0) {
 825                         if (done_reading && state != GZSTATE_MAGIC0) {
 826                                 maybe_warnx("%s: unexpected end of file",
 827                                             filename);
 828                                 goto stop_and_fail;
 829                         }
 830                         goto stop;
 831                 }
 832                 switch (state) {
 833                 case GZSTATE_MAGIC0:
 834                         if (*z.next_in != GZIP_MAGIC0) {
 835                                 if (in_tot > 0) {
 836                                         maybe_warnx("%s: trailing garbage "
 837                                                     "ignored", filename);
 838                                         exit_value = 2;
 839                                         goto stop;
 840                                 }
 841                                 maybe_warnx("input not gziped (MAGIC0)");
 842                                 goto stop_and_fail;
 843                         }
 844                         ADVANCE();
 845                         state++;
 846                         out_sub_tot = 0;
 847                         crc = crc32(0L, Z_NULL, 0);
 848                         break;
 849
 850                 case GZSTATE_MAGIC1:
 851                         if (*z.next_in != GZIP_MAGIC1 &&
 852                             *z.next_in != GZIP_OMAGIC1) {
 853                                 maybe_warnx("input not gziped (MAGIC1)");
 854                                 goto stop_and_fail;
 855                         }
 856                         ADVANCE();
 857                         state++;
 858                         break;
 859
 860                 case GZSTATE_METHOD:
 861                         if (*z.next_in != Z_DEFLATED) {
 862                                 maybe_warnx("unknown compression method");
 863                                 goto stop_and_fail;
 864                         }
 865                         ADVANCE();
 866                         state++;
 867                         break;
 868
 869                 case GZSTATE_FLAGS:
 870                         flags = *z.next_in;
 871                         ADVANCE();
 872                         skip_count = 6;
 873                         state++;
 874                         break;
 875
 876                 case GZSTATE_SKIPPING:
 877                         if (skip_count > 0) {
 878                                 skip_count--;
 879                                 ADVANCE();
 880                         } else
 881                                 state++;
 882                         break;
 883
 884                 case GZSTATE_EXTRA:
 885                         if ((flags & EXTRA_FIELD) == 0) {
 886                                 state = GZSTATE_ORIGNAME;
 887                                 break;
 888                         }
 889                         skip_count = *z.next_in;
 890                         ADVANCE();
 891                         state++;
 892                         break;
 893
 894                 case GZSTATE_EXTRA2:
 895                         skip_count |= ((*z.next_in) << 8);
 896                         ADVANCE();
 897                         state++;
 898                         break;
 899
 900                 case GZSTATE_EXTRA3:
 901                         if (skip_count > 0) {
 902                                 skip_count--;
 903                                 ADVANCE();
 904                         } else
 905                                 state++;
 906                         break;
 907
 908                 case GZSTATE_ORIGNAME:
 909                         if ((flags & ORIG_NAME) == 0) {
 910                                 state++;
 911                                 break;
 912                         }
 913                         if (*z.next_in == 0)
 914                                 state++;
 915                         ADVANCE();
 916                         break;
 917
 918                 case GZSTATE_COMMENT:
 919                         if ((flags & COMMENT) == 0) {
 920                                 state++;
 921                                 break;
 922                         }
 923                         if (*z.next_in == 0)
 924                                 state++;
 925                         ADVANCE();
 926                         break;
 927
 928                 case GZSTATE_HEAD_CRC1:
 929                         if (flags & HEAD_CRC)
 930                                 skip_count = 2;
 931                         else
 932                                 skip_count = 0;
 933                         state++;
 934                         break;
 935
 936                 case GZSTATE_HEAD_CRC2:
 937                         if (skip_count > 0) {
 938                                 skip_count--;
 939                                 ADVANCE();
 940                         } else
 941                                 state++;
 942                         break;
 943
 944                 case GZSTATE_INIT:
 945                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 946                                 maybe_warnx("failed to inflateInit");
 947                                 goto stop_and_fail;
 948                         }
 949                         state++;
 950                         break;
 951
 952                 case GZSTATE_READ:
 953                         error = inflate(&z, Z_FINISH);
 954                         switch (error) {
 955                         /* Z_BUF_ERROR goes with Z_FINISH... */
 956                         case Z_BUF_ERROR:
 957                                 if (z.avail_out > 0 && !done_reading)
 958                                         continue;
 959
 960                         case Z_STREAM_END:
 961                         case Z_OK:
 962                                 break;
 963
 964                         case Z_NEED_DICT:
 965                                 maybe_warnx("Z_NEED_DICT error");
 966                                 goto stop_and_fail;
 967                         case Z_DATA_ERROR:
 968                                 maybe_warnx("data stream error");
 969                                 goto stop_and_fail;
 970                         case Z_STREAM_ERROR:
 971                                 maybe_warnx("internal stream error");
 972                                 goto stop_and_fail;
 973                         case Z_MEM_ERROR:
 974                                 maybe_warnx("memory allocation error");
 975                                 goto stop_and_fail;
 976
 977                         default:
 978                                 maybe_warn("unknown error from inflate(): %d",
 979                                     error);
 980                         }
 981                         wr = BUFLEN - z.avail_out;
 982
 983                         if (wr != 0) {
 984                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 985                                 if (
 986 #ifndef SMALL
 987                                     /* don't write anything with -t */
 988                                     tflag == 0 &&
 989 #endif
 990                                     write_retry(out, outbufp, wr) != wr) {
 991                                         maybe_warn("error writing to output");
 992                                         goto stop_and_fail;
 993                                 }
 994
 995                                 out_tot += wr;
 996                                 out_sub_tot += wr;
 997                         }
 998
 999                         if (error == Z_STREAM_END) {
1000                                 inflateEnd(&z);
1001                                 state++;
1002                         }
1003
1004                         z.next_out = (unsigned char *)outbufp;
1005                         z.avail_out = BUFLEN;
1006
1007                         break;
1008                 case GZSTATE_CRC:
1009                         {
1010                                 uLong origcrc;
1011
1012                                 if (z.avail_in < 4) {
1013                                         if (!done_reading) {
1014                                                 needmore = 1;
1015                                                 continue;
1016                                         }
1017                                         maybe_warnx("truncated input");
1018                                         goto stop_and_fail;
1019                                 }
1020                                 origcrc = le32dec(&z.next_in[0]);
1021                                 if (origcrc != crc) {
1022                                         maybe_warnx("invalid compressed"
1023                                              " data--crc error");
1024                                         goto stop_and_fail;
1025                                 }
1026                         }
1027
1028                         z.avail_in -= 4;
1029                         z.next_in += 4;
1030
1031                         if (!z.avail_in && done_reading) {
1032                                 goto stop;
1033                         }
1034                         state++;
1035                         break;
1036                 case GZSTATE_LEN:
1037                         {
1038                                 uLong origlen;
1039
1040                                 if (z.avail_in < 4) {
1041                                         if (!done_reading) {
1042                                                 needmore = 1;
1043                                                 continue;
1044                                         }
1045                                         maybe_warnx("truncated input");
1046                                         goto stop_and_fail;
1047                                 }
1048                                 origlen = le32dec(&z.next_in[0]);
1049
1050                                 if (origlen != out_sub_tot) {
1051                                         maybe_warnx("invalid compressed"
1052                                              " data--length error");
1053                                         goto stop_and_fail;
1054                                 }
1055                         }
1056
1057                         z.avail_in -= 4;
1058                         z.next_in += 4;
1059
1060                         if (error < 0) {
1061                                 maybe_warnx("decompression error");
1062                                 goto stop_and_fail;
1063                         }
1064                         state = GZSTATE_MAGIC0;
1065                         break;
1066                 }
1067                 continue;
1068 stop_and_fail:
1069                 out_tot = -1;
1070 stop:
1071                 break;
1072         }
1073         if (state > GZSTATE_INIT)
1074                 inflateEnd(&z);
1075
1076         free(inbufp);
1077 out1:
1078         free(outbufp);
1079 out2:
1080         if (gsizep)
1081                 *gsizep = in_tot;
1082         return (out_tot);
1083 }
1084
1085 #ifndef SMALL
1086 /*
1087  * set the owner, mode, flags & utimes using the given file descriptor.
1088  * file is only used in possible warning messages.
1089  */
1090 static void
1091 copymodes(int fd, const struct stat *sbp, const char *file)
1092 {
1093         struct timespec times[2];
1094         struct stat sb;
1095
1096         /*
1097          * If we have no info on the input, give this file some
1098          * default values and return..
1099          */
1100         if (sbp == NULL) {
1101                 mode_t mask = umask(022);
1102
1103                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1104                 (void)umask(mask);
1105                 return;
1106         }
1107         sb = *sbp;
1108
1109         /* if the chown fails, remove set-id bits as-per compress(1) */
1110         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1111                 if (errno != EPERM)
1112                         maybe_warn("couldn't fchown: %s", file);
1113                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1114         }
1115
1116         /* we only allow set-id and the 9 normal permission bits */
1117         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1118         if (fchmod(fd, sb.st_mode) < 0)
1119                 maybe_warn("couldn't fchmod: %s", file);
1120
1121         times[0] = sb.st_atim;
1122         times[1] = sb.st_mtim;
1123         if (futimens(fd, times) < 0)
1124                 maybe_warn("couldn't futimens: %s", file);
1125
1126         /* only try flags if they exist already */
1127         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1128                 maybe_warn("couldn't fchflags: %s", file);
1129 }
1130 #endif
1131
1132 /* what sort of file is this? */
1133 static enum filetype
1134 file_gettype(u_char *buf)
1135 {
1136
1137         if (buf[0] == GZIP_MAGIC0 &&
1138             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1139                 return FT_GZIP;
1140         else
1141 #ifndef NO_BZIP2_SUPPORT
1142         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1143             buf[3] >= '0' && buf[3] <= '9')
1144                 return FT_BZIP2;
1145         else
1146 #endif
1147 #ifndef NO_COMPRESS_SUPPORT
1148         if (memcmp(buf, Z_MAGIC, 2) == 0)
1149                 return FT_Z;
1150         else
1151 #endif
1152 #ifndef NO_PACK_SUPPORT
1153         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1154                 return FT_PACK;
1155         else
1156 #endif
1157 #ifndef NO_XZ_SUPPORT
1158         if (memcmp(buf, XZ_MAGIC, 4) == 0)      /* XXX: We only have 4 bytes */
1159                 return FT_XZ;
1160         else
1161 #endif
1162                 return FT_UNKNOWN;
1163 }
1164
1165 #ifndef SMALL
1166 /* check the outfile is OK. */
1167 static int
1168 check_outfile(const char *outfile)
1169 {
1170         struct stat sb;
1171         int ok = 1;
1172
1173         if (lflag == 0 && stat(outfile, &sb) == 0) {
1174                 if (fflag)
1175                         unlink(outfile);
1176                 else if (isatty(STDIN_FILENO)) {
1177                         char ans[10] = { 'n', '\0' };   /* default */
1178
1179                         fprintf(stderr, "%s already exists -- do you wish to "
1180                                         "overwrite (y or n)? " , outfile);
1181                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1182                         if (ans[0] != 'y' && ans[0] != 'Y') {
1183                                 fprintf(stderr, "\tnot overwriting\n");
1184                                 ok = 0;
1185                         } else
1186                                 unlink(outfile);
1187                 } else {
1188                         maybe_warnx("%s already exists -- skipping", outfile);
1189                         ok = 0;
1190                 }
1191         }
1192         return ok;
1193 }
1194
1195 static void
1196 unlink_input(const char *file, const struct stat *sb)
1197 {
1198         struct stat nsb;
1199
1200         if (kflag)
1201                 return;
1202         if (stat(file, &nsb) != 0)
1203                 /* Must be gone already */
1204                 return;
1205         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1206                 /* Definitely a different file */
1207                 return;
1208         unlink(file);
1209 }
1210
1211 static void
1212 got_sigint(int signo __unused)
1213 {
1214
1215         if (remove_file != NULL)
1216                 unlink(remove_file);
1217         _exit(2);
1218 }
1219
1220 static void
1221 got_siginfo(int signo __unused)
1222 {
1223
1224         print_info = 1;
1225 }
1226
1227 static void
1228 setup_signals(void)
1229 {
1230
1231         signal(SIGINFO, got_siginfo);
1232         signal(SIGINT, got_sigint);
1233 }
1234
1235 static  void
1236 infile_newdata(size_t newdata)
1237 {
1238
1239         infile_current += newdata;
1240 }
1241 #endif
1242
1243 static  void
1244 infile_set(const char *newinfile, off_t total)
1245 {
1246
1247         if (newinfile)
1248                 infile = newinfile;
1249 #ifndef SMALL
1250         infile_total = total;
1251 #endif
1252 }
1253
1254 static  void
1255 infile_clear(void)
1256 {
1257
1258         infile = NULL;
1259 #ifndef SMALL
1260         infile_total = infile_current = 0;
1261 #endif
1262 }
1263
1264 static const suffixes_t *
1265 check_suffix(char *file, int xlate)
1266 {
1267         const suffixes_t *s;
1268         int len = strlen(file);
1269         char *sp;
1270
1271         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1272                 /* if it doesn't fit in "a.suf", don't bother */
1273                 if (s->ziplen >= len)
1274                         continue;
1275                 sp = file + len - s->ziplen;
1276                 if (strcmp(s->zipped, sp) != 0)
1277                         continue;
1278                 if (xlate)
1279                         strcpy(sp, s->normal);
1280                 return s;
1281         }
1282         return NULL;
1283 }
1284
1285 /*
1286  * compress the given file: create a corresponding .gz file and remove the
1287  * original.
1288  */
1289 static off_t
1290 file_compress(char *file, char *outfile, size_t outsize)
1291 {
1292         int in;
1293         int out;
1294         off_t size, in_size;
1295 #ifndef SMALL
1296         struct stat isb, osb;
1297         const suffixes_t *suff;
1298 #endif
1299
1300         in = open(file, O_RDONLY);
1301         if (in == -1) {
1302                 maybe_warn("can't open %s", file);
1303                 return (-1);
1304         }
1305
1306 #ifndef SMALL
1307         if (fstat(in, &isb) != 0) {
1308                 maybe_warn("couldn't stat: %s", file);
1309                 close(in);
1310                 return (-1);
1311         }
1312 #endif
1313
1314 #ifndef SMALL
1315         if (fstat(in, &isb) != 0) {
1316                 close(in);
1317                 maybe_warn("can't stat %s", file);
1318                 return -1;
1319         }
1320         infile_set(file, isb.st_size);
1321 #endif
1322
1323         if (cflag == 0) {
1324 #ifndef SMALL
1325                 if (isb.st_nlink > 1 && fflag == 0) {
1326                         maybe_warnx("%s has %ju other link%s -- "
1327                                     "skipping", file,
1328                                     (uintmax_t)isb.st_nlink - 1,
1329                                     isb.st_nlink == 1 ? "" : "s");
1330                         close(in);
1331                         return -1;
1332                 }
1333
1334                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1335                     suff->zipped[0] != 0) {
1336                         maybe_warnx("%s already has %s suffix -- unchanged",
1337                             file, suff->zipped);
1338                         close(in);
1339                         return (-1);
1340                 }
1341 #endif
1342
1343                 /* Add (usually) .gz to filename */
1344                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1345                     file, suffixes[0].zipped) >= outsize)
1346                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1347                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1348
1349 #ifndef SMALL
1350                 if (check_outfile(outfile) == 0) {
1351                         close(in);
1352                         return (-1);
1353                 }
1354 #endif
1355         }
1356
1357         if (cflag == 0) {
1358                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1359                 if (out == -1) {
1360                         maybe_warn("could not create output: %s", outfile);
1361                         fclose(stdin);
1362                         return (-1);
1363                 }
1364 #ifndef SMALL
1365                 remove_file = outfile;
1366 #endif
1367         } else
1368                 out = STDOUT_FILENO;
1369
1370         in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1371
1372         (void)close(in);
1373
1374         /*
1375          * If there was an error, in_size will be -1.
1376          * If we compressed to stdout, just return the size.
1377          * Otherwise stat the file and check it is the correct size.
1378          * We only blow away the file if we can stat the output and it
1379          * has the expected size.
1380          */
1381         if (cflag != 0)
1382                 return in_size == -1 ? -1 : size;
1383
1384 #ifndef SMALL
1385         if (fstat(out, &osb) != 0) {
1386                 maybe_warn("couldn't stat: %s", outfile);
1387                 goto bad_outfile;
1388         }
1389
1390         if (osb.st_size != size) {
1391                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1392                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1393                 goto bad_outfile;
1394         }
1395
1396         copymodes(out, &isb, outfile);
1397         remove_file = NULL;
1398 #endif
1399         if (close(out) == -1)
1400                 maybe_warn("couldn't close output");
1401
1402         /* output is good, ok to delete input */
1403         unlink_input(file, &isb);
1404         return (size);
1405
1406 #ifndef SMALL
1407     bad_outfile:
1408         if (close(out) == -1)
1409                 maybe_warn("couldn't close output");
1410
1411         maybe_warnx("leaving original %s", file);
1412         unlink(outfile);
1413         return (size);
1414 #endif
1415 }
1416
1417 /* uncompress the given file and remove the original */
1418 static off_t
1419 file_uncompress(char *file, char *outfile, size_t outsize)
1420 {
1421         struct stat isb, osb;
1422         off_t size;
1423         ssize_t rbytes;
1424         unsigned char header1[4];
1425         enum filetype method;
1426         int fd, ofd, zfd = -1;
1427         int error;
1428         size_t in_size;
1429 #ifndef SMALL
1430         ssize_t rv;
1431         time_t timestamp = 0;
1432         char name[PATH_MAX + 1];
1433 #endif
1434
1435         /* gather the old name info */
1436
1437         fd = open(file, O_RDONLY);
1438         if (fd < 0) {
1439                 maybe_warn("can't open %s", file);
1440                 goto lose;
1441         }
1442         if (fstat(fd, &isb) != 0) {
1443                 close(fd);
1444                 maybe_warn("can't stat %s", file);
1445                 goto lose;
1446         }
1447         if (S_ISREG(isb.st_mode))
1448                 in_size = isb.st_size;
1449         else
1450                 in_size = 0;
1451         infile_set(file, in_size);
1452
1453         strlcpy(outfile, file, outsize);
1454         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1455                 maybe_warnx("%s: unknown suffix -- ignored", file);
1456                 goto lose;
1457         }
1458
1459         rbytes = read(fd, header1, sizeof header1);
1460         if (rbytes != sizeof header1) {
1461                 /* we don't want to fail here. */
1462 #ifndef SMALL
1463                 if (fflag)
1464                         goto lose;
1465 #endif
1466                 if (rbytes == -1)
1467                         maybe_warn("can't read %s", file);
1468                 else
1469                         goto unexpected_EOF;
1470                 goto lose;
1471         }
1472         infile_newdata(rbytes);
1473
1474         method = file_gettype(header1);
1475 #ifndef SMALL
1476         if (fflag == 0 && method == FT_UNKNOWN) {
1477                 maybe_warnx("%s: not in gzip format", file);
1478                 goto lose;
1479         }
1480
1481 #endif
1482
1483 #ifndef SMALL
1484         if (method == FT_GZIP && Nflag) {
1485                 unsigned char ts[4];    /* timestamp */
1486
1487                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1488                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1489                         goto unexpected_EOF;
1490                 if (rv == -1) {
1491                         if (!fflag)
1492                                 maybe_warn("can't read %s", file);
1493                         goto lose;
1494                 }
1495                 infile_newdata(rv);
1496                 timestamp = le32dec(&ts[0]);
1497
1498                 if (header1[3] & ORIG_NAME) {
1499                         rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1500                         if (rbytes < 0) {
1501                                 maybe_warn("can't read %s", file);
1502                                 goto lose;
1503                         }
1504                         if (name[0] != '\0') {
1505                                 char *dp, *nf;
1506
1507                                 /* Make sure that name is NUL-terminated */
1508                                 name[rbytes] = '\0';
1509
1510                                 /* strip saved directory name */
1511                                 nf = strrchr(name, '/');
1512                                 if (nf == NULL)
1513                                         nf = name;
1514                                 else
1515                                         nf++;
1516
1517                                 /* preserve original directory name */
1518                                 dp = strrchr(file, '/');
1519                                 if (dp == NULL)
1520                                         dp = file;
1521                                 else
1522                                         dp++;
1523                                 snprintf(outfile, outsize, "%.*s%.*s",
1524                                                 (int) (dp - file),
1525                                                 file, (int) rbytes, nf);
1526                         }
1527                 }
1528         }
1529 #endif
1530         lseek(fd, 0, SEEK_SET);
1531
1532         if (cflag == 0 || lflag) {
1533 #ifndef SMALL
1534                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1535                         maybe_warnx("%s has %ju other links -- skipping",
1536                             file, (uintmax_t)isb.st_nlink - 1);
1537                         goto lose;
1538                 }
1539                 if (nflag == 0 && timestamp)
1540                         isb.st_mtime = timestamp;
1541                 if (check_outfile(outfile) == 0)
1542                         goto lose;
1543 #endif
1544         }
1545
1546         if (cflag)
1547                 zfd = STDOUT_FILENO;
1548         else if (lflag)
1549                 zfd = -1;
1550         else {
1551                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1552                 if (zfd == STDOUT_FILENO) {
1553                         /* We won't close STDOUT_FILENO later... */
1554                         zfd = dup(zfd);
1555                         close(STDOUT_FILENO);
1556                 }
1557                 if (zfd == -1) {
1558                         maybe_warn("can't open %s", outfile);
1559                         goto lose;
1560                 }
1561                 remove_file = outfile;
1562         }
1563
1564         switch (method) {
1565 #ifndef NO_BZIP2_SUPPORT
1566         case FT_BZIP2:
1567                 /* XXX */
1568                 if (lflag) {
1569                         maybe_warnx("no -l with bzip2 files");
1570                         goto lose;
1571                 }
1572
1573                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1574                 break;
1575 #endif
1576
1577 #ifndef NO_COMPRESS_SUPPORT
1578         case FT_Z: {
1579                 FILE *in, *out;
1580
1581                 /* XXX */
1582                 if (lflag) {
1583                         maybe_warnx("no -l with Lempel-Ziv files");
1584                         goto lose;
1585                 }
1586
1587                 if ((in = zdopen(fd)) == NULL) {
1588                         maybe_warn("zdopen for read: %s", file);
1589                         goto lose;
1590                 }
1591
1592                 out = fdopen(dup(zfd), "w");
1593                 if (out == NULL) {
1594                         maybe_warn("fdopen for write: %s", outfile);
1595                         fclose(in);
1596                         goto lose;
1597                 }
1598
1599                 size = zuncompress(in, out, NULL, 0, NULL);
1600                 /* need to fclose() if ferror() is true... */
1601                 error = ferror(in);
1602                 if (error | fclose(in)) {
1603                         if (error)
1604                                 maybe_warn("failed infile");
1605                         else
1606                                 maybe_warn("failed infile fclose");
1607                         if (cflag == 0)
1608                                 unlink(outfile);
1609                         (void)fclose(out);
1610                         goto lose;
1611                 }
1612                 if (fclose(out) != 0) {
1613                         maybe_warn("failed outfile fclose");
1614                         if (cflag == 0)
1615                                 unlink(outfile);
1616                         goto lose;
1617                 }
1618                 break;
1619         }
1620 #endif
1621
1622 #ifndef NO_PACK_SUPPORT
1623         case FT_PACK:
1624                 if (lflag) {
1625                         maybe_warnx("no -l with packed files");
1626                         goto lose;
1627                 }
1628
1629                 size = unpack(fd, zfd, NULL, 0, NULL);
1630                 break;
1631 #endif
1632
1633 #ifndef NO_XZ_SUPPORT
1634         case FT_XZ:
1635                 if (lflag) {
1636                         maybe_warnx("no -l with xz files");
1637                         goto lose;
1638                 }
1639
1640                 size = unxz(fd, zfd, NULL, 0, NULL);
1641                 break;
1642 #endif
1643
1644 #ifndef SMALL
1645         case FT_UNKNOWN:
1646                 if (lflag) {
1647                         maybe_warnx("no -l for unknown filetypes");
1648                         goto lose;
1649                 }
1650                 size = cat_fd(NULL, 0, NULL, fd);
1651                 break;
1652 #endif
1653         default:
1654                 if (lflag) {
1655                         print_list(fd, in_size, outfile, isb.st_mtime);
1656                         close(fd);
1657                         return -1;      /* XXX */
1658                 }
1659
1660                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1661                 break;
1662         }
1663
1664         if (close(fd) != 0)
1665                 maybe_warn("couldn't close input");
1666         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1667                 maybe_warn("couldn't close output");
1668
1669         if (size == -1) {
1670                 if (cflag == 0)
1671                         unlink(outfile);
1672                 maybe_warnx("%s: uncompress failed", file);
1673                 return -1;
1674         }
1675
1676         /* if testing, or we uncompressed to stdout, this is all we need */
1677 #ifndef SMALL
1678         if (tflag)
1679                 return size;
1680 #endif
1681         /* if we are uncompressing to stdin, don't remove the file. */
1682         if (cflag)
1683                 return size;
1684
1685         /*
1686          * if we create a file...
1687          */
1688         /*
1689          * if we can't stat the file don't remove the file.
1690          */
1691
1692         ofd = open(outfile, O_RDWR, 0);
1693         if (ofd == -1) {
1694                 maybe_warn("couldn't open (leaving original): %s",
1695                            outfile);
1696                 return -1;
1697         }
1698         if (fstat(ofd, &osb) != 0) {
1699                 maybe_warn("couldn't stat (leaving original): %s",
1700                            outfile);
1701                 close(ofd);
1702                 return -1;
1703         }
1704         if (osb.st_size != size) {
1705                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1706                     (uintmax_t)size, (uintmax_t)osb.st_size);
1707                 close(ofd);
1708                 unlink(outfile);
1709                 return -1;
1710         }
1711 #ifndef SMALL
1712         copymodes(ofd, &isb, outfile);
1713         remove_file = NULL;
1714 #endif
1715         close(ofd);
1716         unlink_input(file, &isb);
1717         return size;
1718
1719     unexpected_EOF:
1720         maybe_warnx("%s: unexpected end of file", file);
1721     lose:
1722         if (fd != -1)
1723                 close(fd);
1724         if (zfd != -1 && zfd != STDOUT_FILENO)
1725                 close(zfd);
1726         return -1;
1727 }
1728
1729 #ifndef SMALL
1730 static void
1731 check_siginfo(void)
1732 {
1733         if (print_info == 0)
1734                 return;
1735         if (infile) {
1736                 if (infile_total) {
1737                         int pcent = (int)((100.0 * infile_current) / infile_total);
1738
1739                         fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1740                                 infile, (unsigned long long)infile_current,
1741                                 (unsigned long long)infile_total, pcent);
1742                 } else
1743                         fprintf(stderr, "%s: done %llu bytes\n",
1744                                 infile, (unsigned long long)infile_current);
1745         }
1746         print_info = 0;
1747 }
1748
1749 static off_t
1750 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1751 {
1752         char buf[BUFLEN];
1753         off_t in_tot;
1754         ssize_t w;
1755
1756         in_tot = count;
1757         w = write_retry(STDOUT_FILENO, prepend, count);
1758         if (w == -1 || (size_t)w != count) {
1759                 maybe_warn("write to stdout");
1760                 return -1;
1761         }
1762         for (;;) {
1763                 ssize_t rv;
1764
1765                 rv = read(fd, buf, sizeof buf);
1766                 if (rv == 0)
1767                         break;
1768                 if (rv < 0) {
1769                         maybe_warn("read from fd %d", fd);
1770                         break;
1771                 }
1772                 infile_newdata(rv);
1773
1774                 if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1775                         maybe_warn("write to stdout");
1776                         break;
1777                 }
1778                 in_tot += rv;
1779         }
1780
1781         if (gsizep)
1782                 *gsizep = in_tot;
1783         return (in_tot);
1784 }
1785 #endif
1786
1787 static void
1788 handle_stdin(void)
1789 {
1790         struct stat isb;
1791         unsigned char header1[4];
1792         size_t in_size;
1793         off_t usize, gsize;
1794         enum filetype method;
1795         ssize_t bytes_read;
1796 #ifndef NO_COMPRESS_SUPPORT
1797         FILE *in;
1798 #endif
1799
1800 #ifndef SMALL
1801         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1802                 maybe_warnx("standard input is a terminal -- ignoring");
1803                 goto out;
1804         }
1805 #endif
1806
1807         if (fstat(STDIN_FILENO, &isb) < 0) {
1808                 maybe_warn("fstat");
1809                 goto out;
1810         }
1811         if (S_ISREG(isb.st_mode))
1812                 in_size = isb.st_size;
1813         else
1814                 in_size = 0;
1815         infile_set("(stdin)", in_size);
1816
1817         if (lflag) {
1818                 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1819                 goto out;
1820         }
1821
1822         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1823         if (bytes_read == -1) {
1824                 maybe_warn("can't read stdin");
1825                 goto out;
1826         } else if (bytes_read != sizeof(header1)) {
1827                 maybe_warnx("(stdin): unexpected end of file");
1828                 goto out;
1829         }
1830
1831         method = file_gettype(header1);
1832         switch (method) {
1833         default:
1834 #ifndef SMALL
1835                 if (fflag == 0) {
1836                         maybe_warnx("unknown compression format");
1837                         goto out;
1838                 }
1839                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1840                 break;
1841 #endif
1842         case FT_GZIP:
1843                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1844                               (char *)header1, sizeof header1, &gsize, "(stdin)");
1845                 break;
1846 #ifndef NO_BZIP2_SUPPORT
1847         case FT_BZIP2:
1848                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1849                                 (char *)header1, sizeof header1, &gsize);
1850                 break;
1851 #endif
1852 #ifndef NO_COMPRESS_SUPPORT
1853         case FT_Z:
1854                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1855                         maybe_warnx("zopen of stdin");
1856                         goto out;
1857                 }
1858
1859                 usize = zuncompress(in, stdout, (char *)header1,
1860                     sizeof header1, &gsize);
1861                 fclose(in);
1862                 break;
1863 #endif
1864 #ifndef NO_PACK_SUPPORT
1865         case FT_PACK:
1866                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1867                                (char *)header1, sizeof header1, &gsize);
1868                 break;
1869 #endif
1870 #ifndef NO_XZ_SUPPORT
1871         case FT_XZ:
1872                 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1873                              (char *)header1, sizeof header1, &gsize);
1874                 break;
1875 #endif
1876         }
1877
1878 #ifndef SMALL
1879         if (vflag && !tflag && usize != -1 && gsize != -1)
1880                 print_verbage(NULL, NULL, usize, gsize);
1881         if (vflag && tflag)
1882                 print_test("(stdin)", usize != -1);
1883 #else
1884         (void)&usize;
1885 #endif
1886
1887 out:
1888         infile_clear();
1889 }
1890
1891 static void
1892 handle_stdout(void)
1893 {
1894         off_t gsize;
1895 #ifndef SMALL
1896         off_t usize;
1897         struct stat sb;
1898         time_t systime;
1899         uint32_t mtime;
1900         int ret;
1901
1902         infile_set("(stdout)", 0);
1903
1904         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1905                 maybe_warnx("standard output is a terminal -- ignoring");
1906                 return;
1907         }
1908
1909         /* If stdin is a file use its mtime, otherwise use current time */
1910         ret = fstat(STDIN_FILENO, &sb);
1911         if (ret < 0) {
1912                 maybe_warn("Can't stat stdin");
1913                 return;
1914         }
1915
1916         if (S_ISREG(sb.st_mode)) {
1917                 infile_set("(stdout)", sb.st_size);
1918                 mtime = (uint32_t)sb.st_mtime;
1919         } else {
1920                 systime = time(NULL);
1921                 if (systime == -1) {
1922                         maybe_warn("time");
1923                         return;
1924                 }
1925                 mtime = (uint32_t)systime;
1926         }
1927
1928         usize =
1929 #endif
1930                 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1931 #ifndef SMALL
1932         if (vflag && !tflag && usize != -1 && gsize != -1)
1933                 print_verbage(NULL, NULL, usize, gsize);
1934 #endif
1935 }
1936
1937 /* do what is asked for, for the path name */
1938 static void
1939 handle_pathname(char *path)
1940 {
1941         char *opath = path, *s = NULL;
1942         ssize_t len;
1943         int slen;
1944         struct stat sb;
1945
1946         /* check for stdout/stdin */
1947         if (path[0] == '-' && path[1] == '\0') {
1948                 if (dflag)
1949                         handle_stdin();
1950                 else
1951                         handle_stdout();
1952                 return;
1953         }
1954
1955 retry:
1956         if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1957             lstat(path, &sb) != 0)) {
1958                 /* lets try <path>.gz if we're decompressing */
1959                 if (dflag && s == NULL && errno == ENOENT) {
1960                         len = strlen(path);
1961                         slen = suffixes[0].ziplen;
1962                         s = malloc(len + slen + 1);
1963                         if (s == NULL)
1964                                 maybe_err("malloc");
1965                         memcpy(s, path, len);
1966                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1967                         path = s;
1968                         goto retry;
1969                 }
1970                 maybe_warn("can't stat: %s", opath);
1971                 goto out;
1972         }
1973
1974         if (S_ISDIR(sb.st_mode)) {
1975 #ifndef SMALL
1976                 if (rflag)
1977                         handle_dir(path);
1978                 else
1979 #endif
1980                         maybe_warnx("%s is a directory", path);
1981                 goto out;
1982         }
1983
1984         if (S_ISREG(sb.st_mode))
1985                 handle_file(path, &sb);
1986         else
1987                 maybe_warnx("%s is not a regular file", path);
1988
1989 out:
1990         if (s)
1991                 free(s);
1992 }
1993
1994 /* compress/decompress a file */
1995 static void
1996 handle_file(char *file, struct stat *sbp)
1997 {
1998         off_t usize, gsize;
1999         char    outfile[PATH_MAX];
2000
2001         infile_set(file, sbp->st_size);
2002         if (dflag) {
2003                 usize = file_uncompress(file, outfile, sizeof(outfile));
2004 #ifndef SMALL
2005                 if (vflag && tflag)
2006                         print_test(file, usize != -1);
2007 #endif
2008                 if (usize == -1)
2009                         return;
2010                 gsize = sbp->st_size;
2011         } else {
2012                 gsize = file_compress(file, outfile, sizeof(outfile));
2013                 if (gsize == -1)
2014                         return;
2015                 usize = sbp->st_size;
2016         }
2017         infile_clear();
2018
2019 #ifndef SMALL
2020         if (vflag && !tflag)
2021                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
2022 #endif
2023 }
2024
2025 #ifndef SMALL
2026 /* this is used with -r to recursively descend directories */
2027 static void
2028 handle_dir(char *dir)
2029 {
2030         char *path_argv[2];
2031         FTS *fts;
2032         FTSENT *entry;
2033
2034         path_argv[0] = dir;
2035         path_argv[1] = 0;
2036         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
2037         if (fts == NULL) {
2038                 warn("couldn't fts_open %s", dir);
2039                 return;
2040         }
2041
2042         while ((entry = fts_read(fts))) {
2043                 switch(entry->fts_info) {
2044                 case FTS_D:
2045                 case FTS_DP:
2046                         continue;
2047
2048                 case FTS_DNR:
2049                 case FTS_ERR:
2050                 case FTS_NS:
2051                         maybe_warn("%s", entry->fts_path);
2052                         continue;
2053                 case FTS_F:
2054                         handle_file(entry->fts_path, entry->fts_statp);
2055                 }
2056         }
2057         (void)fts_close(fts);
2058 }
2059 #endif
2060
2061 /* print a ratio - size reduction as a fraction of uncompressed size */
2062 static void
2063 print_ratio(off_t in, off_t out, FILE *where)
2064 {
2065         int percent10;  /* 10 * percent */
2066         off_t diff;
2067         char buff[8];
2068         int len;
2069
2070         diff = in - out/2;
2071         if (in == 0 && out == 0)
2072                 percent10 = 0;
2073         else if (diff < 0)
2074                 /*
2075                  * Output is more than double size of input! print -99.9%
2076                  * Quite possibly we've failed to get the original size.
2077                  */
2078                 percent10 = -999;
2079         else {
2080                 /*
2081                  * We only need 12 bits of result from the final division,
2082                  * so reduce the values until a 32bit division will suffice.
2083                  */
2084                 while (in > 0x100000) {
2085                         diff >>= 1;
2086                         in >>= 1;
2087                 }
2088                 if (in != 0)
2089                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2090                 else
2091                         percent10 = 0;
2092         }
2093
2094         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2095         /* Move the '.' to before the last digit */
2096         buff[len - 1] = buff[len - 2];
2097         buff[len - 2] = '.';
2098         fprintf(where, "%5s%%", buff);
2099 }
2100
2101 #ifndef SMALL
2102 /* print compression statistics, and the new name (if there is one!) */
2103 static void
2104 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2105 {
2106         if (file)
2107                 fprintf(stderr, "%s:%s  ", file,
2108                     strlen(file) < 7 ? "\t\t" : "\t");
2109         print_ratio(usize, gsize, stderr);
2110         if (nfile)
2111                 fprintf(stderr, " -- replaced with %s", nfile);
2112         fprintf(stderr, "\n");
2113         fflush(stderr);
2114 }
2115
2116 /* print test results */
2117 static void
2118 print_test(const char *file, int ok)
2119 {
2120
2121         if (exit_value == 0 && ok == 0)
2122                 exit_value = 1;
2123         fprintf(stderr, "%s:%s  %s\n", file,
2124             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2125         fflush(stderr);
2126 }
2127 #endif
2128
2129 /* print a file's info ala --list */
2130 /* eg:
2131   compressed uncompressed  ratio uncompressed_name
2132       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2133 */
2134 static void
2135 print_list(int fd, off_t out, const char *outfile, time_t ts)
2136 {
2137         static int first = 1;
2138 #ifndef SMALL
2139         static off_t in_tot, out_tot;
2140         uint32_t crc = 0;
2141 #endif
2142         off_t in = 0, rv;
2143
2144         if (first) {
2145 #ifndef SMALL
2146                 if (vflag)
2147                         printf("method  crc     date  time  ");
2148 #endif
2149                 if (qflag == 0)
2150                         printf("  compressed uncompressed  "
2151                                "ratio uncompressed_name\n");
2152         }
2153         first = 0;
2154
2155         /* print totals? */
2156 #ifndef SMALL
2157         if (fd == -1) {
2158                 in = in_tot;
2159                 out = out_tot;
2160         } else
2161 #endif
2162         {
2163                 /* read the last 4 bytes - this is the uncompressed size */
2164                 rv = lseek(fd, (off_t)(-8), SEEK_END);
2165                 if (rv != -1) {
2166                         unsigned char buf[8];
2167                         uint32_t usize;
2168
2169                         rv = read(fd, (char *)buf, sizeof(buf));
2170                         if (rv == -1)
2171                                 maybe_warn("read of uncompressed size");
2172                         else if (rv != sizeof(buf))
2173                                 maybe_warnx("read of uncompressed size");
2174
2175                         else {
2176                                 usize = le32dec(&buf[4]);
2177                                 in = (off_t)usize;
2178 #ifndef SMALL
2179                                 crc = le32dec(&buf[0]);
2180 #endif
2181                         }
2182                 }
2183         }
2184
2185 #ifndef SMALL
2186         if (vflag && fd == -1)
2187                 printf("                            ");
2188         else if (vflag) {
2189                 char *date = ctime(&ts);
2190
2191                 /* skip the day, 1/100th second, and year */
2192                 date += 4;
2193                 date[12] = 0;
2194                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2195         }
2196         in_tot += in;
2197         out_tot += out;
2198 #else
2199         (void)&ts;      /* XXX */
2200 #endif
2201         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2202         print_ratio(in, out, stdout);
2203         printf(" %s\n", outfile);
2204 }
2205
2206 /* display the usage of NetBSD gzip */
2207 static void
2208 usage(void)
2209 {
2210
2211         fprintf(stderr, "%s\n", gzip_version);
2212         fprintf(stderr,
2213 #ifdef SMALL
2214     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2215 #else
2216     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2217     " -1 --fast            fastest (worst) compression\n"
2218     " -2 .. -8             set compression level\n"
2219     " -9 --best            best (slowest) compression\n"
2220     " -c --stdout          write to stdout, keep original files\n"
2221     "    --to-stdout\n"
2222     " -d --decompress      uncompress files\n"
2223     "    --uncompress\n"
2224     " -f --force           force overwriting & compress links\n"
2225     " -h --help            display this help\n"
2226     " -k --keep            don't delete input files during operation\n"
2227     " -l --list            list compressed file contents\n"
2228     " -N --name            save or restore original file name and time stamp\n"
2229     " -n --no-name         don't save original file name or time stamp\n"
2230     " -q --quiet           output no warnings\n"
2231     " -r --recursive       recursively compress files in directories\n"
2232     " -S .suf              use suffix .suf instead of .gz\n"
2233     "    --suffix .suf\n"
2234     " -t --test            test compressed file\n"
2235     " -V --version         display program version\n"
2236     " -v --verbose         print extra statistics\n",
2237 #endif
2238             getprogname());
2239         exit(0);
2240 }
2241
2242 #ifndef SMALL
2243 /* display the license information of FreeBSD gzip */
2244 static void
2245 display_license(void)
2246 {
2247
2248         fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2249         fprintf(stderr, "%s\n", gzip_copyright);
2250         exit(0);
2251 }
2252 #endif
2253
2254 /* display the version of NetBSD gzip */
2255 static void
2256 display_version(void)
2257 {
2258
2259         fprintf(stderr, "%s\n", gzip_version);
2260         exit(0);
2261 }
2262
2263 #ifndef NO_BZIP2_SUPPORT
2264 #include "unbzip2.c"
2265 #endif
2266 #ifndef NO_COMPRESS_SUPPORT
2267 #include "zuncompress.c"
2268 #endif
2269 #ifndef NO_PACK_SUPPORT
2270 #include "unpack.c"
2271 #endif
2272 #ifndef NO_XZ_SUPPORT
2273 #include "unxz.c"
2274 #endif
2275
2276 static ssize_t
2277 read_retry(int fd, void *buf, size_t sz)
2278 {
2279         char *cp = buf;
2280         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2281
2282         while (left > 0) {
2283                 ssize_t ret;
2284
2285                 ret = read(fd, cp, left);
2286                 if (ret == -1) {
2287                         return ret;
2288                 } else if (ret == 0) {
2289                         break; /* EOF */
2290                 }
2291                 cp += ret;
2292                 left -= ret;
2293         }
2294
2295         return sz - left;
2296 }
2297
2298 static ssize_t
2299 write_retry(int fd, const void *buf, size_t sz)
2300 {
2301         const char *cp = buf;
2302         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2303
2304         while (left > 0) {
2305                 ssize_t ret;
2306
2307                 ret = write(fd, cp, left);
2308                 if (ret == -1) {
2309                         return ret;
2310                 } else if (ret == 0) {
2311                         abort();        /* Can't happen */
2312                 }
2313                 cp += ret;
2314                 left -= ret;
2315         }
2316
2317         return sz - left;
2318 }