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 #ifndef SMALL
 148         SUFFIX(GZ_SUFFIX,       ""),
 149         SUFFIX(".z",            ""),
 150         SUFFIX("-gz",           ""),
 151         SUFFIX("-z",            ""),
 152         SUFFIX("_z",            ""),
 153         SUFFIX(".taz",          ".tar"),
 154         SUFFIX(".tgz",          ".tar"),
 155 #ifndef NO_BZIP2_SUPPORT
 156         SUFFIX(BZ2_SUFFIX,      ""),
 157         SUFFIX(".tbz",          ".tar"),
 158         SUFFIX(".tbz2",         ".tar"),
 159 #endif
 160 #ifndef NO_COMPRESS_SUPPORT
 161         SUFFIX(Z_SUFFIX,        ""),
 162 #endif
 163 #ifndef NO_XZ_SUPPORT
 164         SUFFIX(XZ_SUFFIX,       ""),
 165 #endif
 166 #ifndef NO_LZ_SUPPORT
 167         SUFFIX(LZ_SUFFIX,       ""),
 168 #endif
 169         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 170 #endif /* SMALL */
 171 #undef SUFFIX
 172 };
 173 #define NUM_SUFFIXES (nitems(suffixes))
 174 #define SUFFIX_MAXLEN   30
 175
 176 static  const char      gzip_version[] = "FreeBSD gzip 20190107";
 177
 178 #ifndef SMALL
 179 static  const char      gzip_copyright[] = \
 180 "   Copyright (c) 1997, 1998, 2003, 2004, 2006 Matthew R. Green\n"
 181 "   All rights reserved.\n"
 182 "\n"
 183 "   Redistribution and use in source and binary forms, with or without\n"
 184 "   modification, are permitted provided that the following conditions\n"
 185 "   are met:\n"
 186 "   1. Redistributions of source code must retain the above copyright\n"
 187 "      notice, this list of conditions and the following disclaimer.\n"
 188 "   2. Redistributions in binary form must reproduce the above copyright\n"
 189 "      notice, this list of conditions and the following disclaimer in the\n"
 190 "      documentation and/or other materials provided with the distribution.\n"
 191 "\n"
 192 "   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
 193 "   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"
 194 "   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"
 195 "   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"
 196 "   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\n"
 197 "   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
 198 "   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED\n"
 199 "   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\n"
 200 "   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\n"
 201 "   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\n"
 202 "   SUCH DAMAGE.";
 203 #endif
 204
 205 static  int     cflag;                  /* stdout mode */
 206 static  int     dflag;                  /* decompress mode */
 207 static  int     lflag;                  /* list mode */
 208 static  int     numflag = 6;            /* gzip -1..-9 value */
 209
 210 static  const char *remove_file = NULL; /* file to be removed upon SIGINT */
 211
 212 static  int     fflag;                  /* force mode */
 213 #ifndef SMALL
 214 static  int     kflag;                  /* don't delete input files */
 215 static  int     nflag;                  /* don't save name/timestamp */
 216 static  int     Nflag;                  /* don't restore name/timestamp */
 217 static  int     qflag;                  /* quiet mode */
 218 static  int     rflag;                  /* recursive mode */
 219 static  int     tflag;                  /* test */
 220 static  int     vflag;                  /* verbose mode */
 221 static  sig_atomic_t print_info = 0;
 222 #else
 223 #define         qflag   0
 224 #define         tflag   0
 225 #endif
 226
 227 static  int     exit_value = 0;         /* exit value */
 228
 229 static  const char *infile;             /* name of file coming in */
 230
 231 static  void    maybe_err(const char *fmt, ...) __printflike(1, 2) __dead2;
 232 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 233     !defined(NO_XZ_SUPPORT)
 234 static  void    maybe_errx(const char *fmt, ...) __printflike(1, 2) __dead2;
 235 #endif
 236 static  void    maybe_warn(const char *fmt, ...) __printflike(1, 2);
 237 static  void    maybe_warnx(const char *fmt, ...) __printflike(1, 2);
 238 static  enum filetype file_gettype(u_char *);
 239 #ifdef SMALL
 240 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 241 #endif
 242 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 243 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 244 static  off_t   file_compress(char *, char *, size_t);
 245 static  off_t   file_uncompress(char *, char *, size_t);
 246 static  void    handle_pathname(char *);
 247 static  void    handle_file(char *, struct stat *);
 248 static  void    handle_stdin(void);
 249 static  void    handle_stdout(void);
 250 static  void    print_ratio(off_t, off_t, FILE *);
 251 static  void    print_list(int fd, off_t, const char *, time_t);
 252 static  void    usage(void) __dead2;
 253 static  void    display_version(void) __dead2;
 254 #ifndef SMALL
 255 static  void    display_license(void);
 256 #endif
 257 static  const suffixes_t *check_suffix(char *, int);
 258 static  ssize_t read_retry(int, void *, size_t);
 259 static  ssize_t write_retry(int, const void *, size_t);
 260 static void     print_list_out(off_t, off_t, const char*);
 261
 262 #ifdef SMALL
 263 #define infile_set(f,t) infile_set(f)
 264 #endif
 265 static  void    infile_set(const char *newinfile, off_t total);
 266
 267 #ifdef SMALL
 268 #define unlink_input(f, sb) unlink(f)
 269 #define check_siginfo() /* nothing */
 270 #define setup_signals() /* nothing */
 271 #define infile_newdata(t) /* nothing */
 272 #else
 273 static  off_t   infile_total;           /* total expected to read/write */
 274 static  off_t   infile_current;         /* current read/write */
 275
 276 static  void    check_siginfo(void);
 277 static  off_t   cat_fd(unsigned char *, size_t, off_t *, int fd);
 278 static  void    prepend_gzip(char *, int *, char ***);
 279 static  void    handle_dir(char *);
 280 static  void    print_verbage(const char *, const char *, off_t, off_t);
 281 static  void    print_test(const char *, int);
 282 static  void    copymodes(int fd, const struct stat *, const char *file);
 283 static  int     check_outfile(const char *outfile);
 284 static  void    setup_signals(void);
 285 static  void    infile_newdata(size_t newdata);
 286 static  void    infile_clear(void);
 287 #endif
 288
 289 #ifndef NO_BZIP2_SUPPORT
 290 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 291 #endif
 292
 293 #ifndef NO_COMPRESS_SUPPORT
 294 static  FILE    *zdopen(int);
 295 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 296 #endif
 297
 298 #ifndef NO_PACK_SUPPORT
 299 static  off_t   unpack(int, int, char *, size_t, off_t *);
 300 #endif
 301
 302 #ifndef NO_XZ_SUPPORT
 303 static  off_t   unxz(int, int, char *, size_t, off_t *);
 304 static  off_t   unxz_len(int);
 305 #endif
 306
 307 #ifndef NO_LZ_SUPPORT
 308 static  off_t   unlz(int, int, char *, size_t, off_t *);
 309 #endif
 310
 311 #ifdef SMALL
 312 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 313 #else
 314 static const struct option longopts[] = {
 315         { "stdout",             no_argument,            0,      'c' },
 316         { "to-stdout",          no_argument,            0,      'c' },
 317         { "decompress",         no_argument,            0,      'd' },
 318         { "uncompress",         no_argument,            0,      'd' },
 319         { "force",              no_argument,            0,      'f' },
 320         { "help",               no_argument,            0,      'h' },
 321         { "keep",               no_argument,            0,      'k' },
 322         { "list",               no_argument,            0,      'l' },
 323         { "no-name",            no_argument,            0,      'n' },
 324         { "name",               no_argument,            0,      'N' },
 325         { "quiet",              no_argument,            0,      'q' },
 326         { "recursive",          no_argument,            0,      'r' },
 327         { "suffix",             required_argument,      0,      'S' },
 328         { "test",               no_argument,            0,      't' },
 329         { "verbose",            no_argument,            0,      'v' },
 330         { "version",            no_argument,            0,      'V' },
 331         { "fast",               no_argument,            0,      '1' },
 332         { "best",               no_argument,            0,      '9' },
 333         { "ascii",              no_argument,            0,      'a' },
 334         { "license",            no_argument,            0,      'L' },
 335         { NULL,                 no_argument,            0,      0 },
 336 };
 337 #endif
 338
 339 int
 340 main(int argc, char **argv)
 341 {
 342         const char *progname = getprogname();
 343 #ifndef SMALL
 344         char *gzip;
 345         int len;
 346 #endif
 347         int ch;
 348
 349         setup_signals();
 350
 351 #ifndef SMALL
 352         if ((gzip = getenv("GZIP")) != NULL)
 353                 prepend_gzip(gzip, &argc, &argv);
 354 #endif
 355
 356         /*
 357          * XXX
 358          * handle being called `gunzip', `zcat' and `gzcat'
 359          */
 360         if (strcmp(progname, "gunzip") == 0)
 361                 dflag = 1;
 362         else if (strcmp(progname, "zcat") == 0 ||
 363                  strcmp(progname, "gzcat") == 0)
 364                 dflag = cflag = 1;
 365
 366 #ifdef SMALL
 367 #define OPT_LIST "123456789cdhlV"
 368 #else
 369 #define OPT_LIST "123456789acdfhklLNnqrS:tVv"
 370 #endif
 371
 372         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 373                 switch (ch) {
 374                 case '1': case '2': case '3':
 375                 case '4': case '5': case '6':
 376                 case '7': case '8': case '9':
 377                         numflag = ch - '0';
 378                         break;
 379                 case 'c':
 380                         cflag = 1;
 381                         break;
 382                 case 'd':
 383                         dflag = 1;
 384                         break;
 385                 case 'l':
 386                         lflag = 1;
 387                         dflag = 1;
 388                         break;
 389                 case 'V':
 390                         display_version();
 391                         /* NOTREACHED */
 392 #ifndef SMALL
 393                 case 'a':
 394                         fprintf(stderr, "%s: option --ascii ignored on this system\n", progname);
 395                         break;
 396                 case 'f':
 397                         fflag = 1;
 398                         break;
 399                 case 'k':
 400                         kflag = 1;
 401                         break;
 402                 case 'L':
 403                         display_license();
 404                         /* NOT REACHED */
 405                 case 'N':
 406                         nflag = 0;
 407                         Nflag = 1;
 408                         break;
 409                 case 'n':
 410                         nflag = 1;
 411                         Nflag = 0;
 412                         break;
 413                 case 'q':
 414                         qflag = 1;
 415                         break;
 416                 case 'r':
 417                         rflag = 1;
 418                         break;
 419                 case 'S':
 420                         len = strlen(optarg);
 421                         if (len != 0) {
 422                                 if (len > SUFFIX_MAXLEN)
 423                                         errx(1, "incorrect suffix: '%s': too long", optarg);
 424                                 suffixes[0].zipped = optarg;
 425                                 suffixes[0].ziplen = len;
 426                         } else {
 427                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 428                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 429                         }
 430                         break;
 431                 case 't':
 432                         cflag = 1;
 433                         tflag = 1;
 434                         dflag = 1;
 435                         break;
 436                 case 'v':
 437                         vflag = 1;
 438                         break;
 439 #endif
 440                 default:
 441                         usage();
 442                         /* NOTREACHED */
 443                 }
 444         }
 445         argv += optind;
 446         argc -= optind;
 447
 448         if (argc == 0) {
 449                 if (dflag)      /* stdin mode */
 450                         handle_stdin();
 451                 else            /* stdout mode */
 452                         handle_stdout();
 453         } else {
 454                 do {
 455                         handle_pathname(argv[0]);
 456                 } while (*++argv);
 457         }
 458 #ifndef SMALL
 459         if (qflag == 0 && lflag && argc > 1)
 460                 print_list(-1, 0, "(totals)", 0);
 461 #endif
 462         exit(exit_value);
 463 }
 464
 465 /* maybe print a warning */
 466 void
 467 maybe_warn(const char *fmt, ...)
 468 {
 469         va_list ap;
 470
 471         if (qflag == 0) {
 472                 va_start(ap, fmt);
 473                 vwarn(fmt, ap);
 474                 va_end(ap);
 475         }
 476         if (exit_value == 0)
 477                 exit_value = 1;
 478 }
 479
 480 /* ... without an errno. */
 481 void
 482 maybe_warnx(const char *fmt, ...)
 483 {
 484         va_list ap;
 485
 486         if (qflag == 0) {
 487                 va_start(ap, fmt);
 488                 vwarnx(fmt, ap);
 489                 va_end(ap);
 490         }
 491         if (exit_value == 0)
 492                 exit_value = 1;
 493 }
 494
 495 /* maybe print an error */
 496 void
 497 maybe_err(const char *fmt, ...)
 498 {
 499         va_list ap;
 500
 501         if (qflag == 0) {
 502                 va_start(ap, fmt);
 503                 vwarn(fmt, ap);
 504                 va_end(ap);
 505         }
 506         exit(2);
 507 }
 508
 509 #if !defined(NO_BZIP2_SUPPORT) || !defined(NO_PACK_SUPPORT) ||  \
 510     !defined(NO_XZ_SUPPORT)
 511 /* ... without an errno. */
 512 void
 513 maybe_errx(const char *fmt, ...)
 514 {
 515         va_list ap;
 516
 517         if (qflag == 0) {
 518                 va_start(ap, fmt);
 519                 vwarnx(fmt, ap);
 520                 va_end(ap);
 521         }
 522         exit(2);
 523 }
 524 #endif
 525
 526 #ifndef SMALL
 527 /* split up $GZIP and prepend it to the argument list */
 528 static void
 529 prepend_gzip(char *gzip, int *argc, char ***argv)
 530 {
 531         char *s, **nargv, **ac;
 532         int nenvarg = 0, i;
 533
 534         /* scan how many arguments there are */
 535         for (s = gzip;;) {
 536                 while (*s == ' ' || *s == '\t')
 537                         s++;
 538                 if (*s == 0)
 539                         goto count_done;
 540                 nenvarg++;
 541                 while (*s != ' ' && *s != '\t')
 542                         if (*s++ == 0)
 543                                 goto count_done;
 544         }
 545 count_done:
 546         /* punt early */
 547         if (nenvarg == 0)
 548                 return;
 549
 550         *argc += nenvarg;
 551         ac = *argv;
 552
 553         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 554         if (nargv == NULL)
 555                 maybe_err("malloc");
 556
 557         /* stash this away */
 558         *argv = nargv;
 559
 560         /* copy the program name first */
 561         i = 0;
 562         nargv[i++] = *(ac++);
 563
 564         /* take a copy of $GZIP and add it to the array */
 565         s = strdup(gzip);
 566         if (s == NULL)
 567                 maybe_err("strdup");
 568         for (;;) {
 569                 /* Skip whitespaces. */
 570                 while (*s == ' ' || *s == '\t')
 571                         s++;
 572                 if (*s == 0)
 573                         goto copy_done;
 574                 nargv[i++] = s;
 575                 /* Find the end of this argument. */
 576                 while (*s != ' ' && *s != '\t')
 577                         if (*s++ == 0)
 578                                 /* Argument followed by NUL. */
 579                                 goto copy_done;
 580                 /* Terminate by overwriting ' ' or '\t' with NUL. */
 581                 *s++ = 0;
 582         }
 583 copy_done:
 584
 585         /* copy the original arguments and a NULL */
 586         while (*ac)
 587                 nargv[i++] = *(ac++);
 588         nargv[i] = NULL;
 589 }
 590 #endif
 591
 592 /* compress input to output. Return bytes read, -1 on error */
 593 static off_t
 594 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 595 {
 596         z_stream z;
 597         char *outbufp, *inbufp;
 598         off_t in_tot = 0, out_tot = 0;
 599         ssize_t in_size;
 600         int i, error;
 601         uLong crc;
 602 #ifdef SMALL
 603         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 604                                  0, 0, 0, 0,
 605                                  0, OS_CODE };
 606 #endif
 607
 608         outbufp = malloc(BUFLEN);
 609         inbufp = malloc(BUFLEN);
 610         if (outbufp == NULL || inbufp == NULL) {
 611                 maybe_err("malloc failed");
 612                 goto out;
 613         }
 614
 615         memset(&z, 0, sizeof z);
 616         z.zalloc = Z_NULL;
 617         z.zfree = Z_NULL;
 618         z.opaque = 0;
 619
 620 #ifdef SMALL
 621         memcpy(outbufp, header, sizeof header);
 622         i = sizeof header;
 623 #else
 624         if (nflag != 0) {
 625                 mtime = 0;
 626                 origname = "";
 627         }
 628
 629         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 630                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 631                      *origname ? ORIG_NAME : 0,
 632                      mtime & 0xff,
 633                      (mtime >> 8) & 0xff,
 634                      (mtime >> 16) & 0xff,
 635                      (mtime >> 24) & 0xff,
 636                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 637                      OS_CODE, origname);
 638         if (i >= BUFLEN)
 639                 /* this need PATH_MAX > BUFLEN ... */
 640                 maybe_err("snprintf");
 641         if (*origname)
 642                 i++;
 643 #endif
 644
 645         z.next_out = (unsigned char *)outbufp + i;
 646         z.avail_out = BUFLEN - i;
 647
 648         error = deflateInit2(&z, numflag, Z_DEFLATED,
 649                              (-MAX_WBITS), 8, Z_DEFAULT_STRATEGY);
 650         if (error != Z_OK) {
 651                 maybe_warnx("deflateInit2 failed");
 652                 in_tot = -1;
 653                 goto out;
 654         }
 655
 656         crc = crc32(0L, Z_NULL, 0);
 657         for (;;) {
 658                 if (z.avail_out == 0) {
 659                         if (write_retry(out, outbufp, BUFLEN) != BUFLEN) {
 660                                 maybe_warn("write");
 661                                 out_tot = -1;
 662                                 goto out;
 663                         }
 664
 665                         out_tot += BUFLEN;
 666                         z.next_out = (unsigned char *)outbufp;
 667                         z.avail_out = BUFLEN;
 668                 }
 669
 670                 if (z.avail_in == 0) {
 671                         in_size = read(in, inbufp, BUFLEN);
 672                         if (in_size < 0) {
 673                                 maybe_warn("read");
 674                                 in_tot = -1;
 675                                 goto out;
 676                         }
 677                         if (in_size == 0)
 678                                 break;
 679                         infile_newdata(in_size);
 680
 681                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 682                         in_tot += in_size;
 683                         z.next_in = (unsigned char *)inbufp;
 684                         z.avail_in = in_size;
 685                 }
 686
 687                 error = deflate(&z, Z_NO_FLUSH);
 688                 if (error != Z_OK && error != Z_STREAM_END) {
 689                         maybe_warnx("deflate failed");
 690                         in_tot = -1;
 691                         goto out;
 692                 }
 693         }
 694
 695         /* clean up */
 696         for (;;) {
 697                 size_t len;
 698                 ssize_t w;
 699
 700                 error = deflate(&z, Z_FINISH);
 701                 if (error != Z_OK && error != Z_STREAM_END) {
 702                         maybe_warnx("deflate failed");
 703                         in_tot = -1;
 704                         goto out;
 705                 }
 706
 707                 len = (char *)z.next_out - outbufp;
 708
 709                 w = write_retry(out, outbufp, len);
 710                 if (w == -1 || (size_t)w != len) {
 711                         maybe_warn("write");
 712                         out_tot = -1;
 713                         goto out;
 714                 }
 715                 out_tot += len;
 716                 z.next_out = (unsigned char *)outbufp;
 717                 z.avail_out = BUFLEN;
 718
 719                 if (error == Z_STREAM_END)
 720                         break;
 721         }
 722
 723         if (deflateEnd(&z) != Z_OK) {
 724                 maybe_warnx("deflateEnd failed");
 725                 in_tot = -1;
 726                 goto out;
 727         }
 728
 729         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 730                  (int)crc & 0xff,
 731                  (int)(crc >> 8) & 0xff,
 732                  (int)(crc >> 16) & 0xff,
 733                  (int)(crc >> 24) & 0xff,
 734                  (int)in_tot & 0xff,
 735                  (int)(in_tot >> 8) & 0xff,
 736                  (int)(in_tot >> 16) & 0xff,
 737                  (int)(in_tot >> 24) & 0xff);
 738         if (i != 8)
 739                 maybe_err("snprintf");
 740         if (write_retry(out, outbufp, i) != i) {
 741                 maybe_warn("write");
 742                 in_tot = -1;
 743         } else
 744                 out_tot += i;
 745
 746 out:
 747         if (inbufp != NULL)
 748                 free(inbufp);
 749         if (outbufp != NULL)
 750                 free(outbufp);
 751         if (gsizep)
 752                 *gsizep = out_tot;
 753         return in_tot;
 754 }
 755
 756 /*
 757  * uncompress input to output then close the input.  return the
 758  * uncompressed size written, and put the compressed sized read
 759  * into `*gsizep'.
 760  */
 761 static off_t
 762 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 763               const char *filename)
 764 {
 765         z_stream z;
 766         char *outbufp, *inbufp;
 767         off_t out_tot = -1, in_tot = 0;
 768         uint32_t out_sub_tot = 0;
 769         enum {
 770                 GZSTATE_MAGIC0,
 771                 GZSTATE_MAGIC1,
 772                 GZSTATE_METHOD,
 773                 GZSTATE_FLAGS,
 774                 GZSTATE_SKIPPING,
 775                 GZSTATE_EXTRA,
 776                 GZSTATE_EXTRA2,
 777                 GZSTATE_EXTRA3,
 778                 GZSTATE_ORIGNAME,
 779                 GZSTATE_COMMENT,
 780                 GZSTATE_HEAD_CRC1,
 781                 GZSTATE_HEAD_CRC2,
 782                 GZSTATE_INIT,
 783                 GZSTATE_READ,
 784                 GZSTATE_CRC,
 785                 GZSTATE_LEN,
 786         } state = GZSTATE_MAGIC0;
 787         int flags = 0, skip_count = 0;
 788         int error = Z_STREAM_ERROR, done_reading = 0;
 789         uLong crc = 0;
 790         ssize_t wr;
 791         int needmore = 0;
 792
 793 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 794
 795         if ((outbufp = malloc(BUFLEN)) == NULL) {
 796                 maybe_err("malloc failed");
 797                 goto out2;
 798         }
 799         if ((inbufp = malloc(BUFLEN)) == NULL) {
 800                 maybe_err("malloc failed");
 801                 goto out1;
 802         }
 803
 804         memset(&z, 0, sizeof z);
 805         z.avail_in = prelen;
 806         z.next_in = (unsigned char *)pre;
 807         z.avail_out = BUFLEN;
 808         z.next_out = (unsigned char *)outbufp;
 809         z.zalloc = NULL;
 810         z.zfree = NULL;
 811         z.opaque = 0;
 812
 813         in_tot = prelen;
 814         out_tot = 0;
 815
 816         for (;;) {
 817                 check_siginfo();
 818                 if ((z.avail_in == 0 || needmore) && done_reading == 0) {
 819                         ssize_t in_size;
 820
 821                         if (z.avail_in > 0) {
 822                                 memmove(inbufp, z.next_in, z.avail_in);
 823                         }
 824                         z.next_in = (unsigned char *)inbufp;
 825                         in_size = read(in, z.next_in + z.avail_in,
 826                             BUFLEN - z.avail_in);
 827
 828                         if (in_size == -1) {
 829                                 maybe_warn("failed to read stdin");
 830                                 goto stop_and_fail;
 831                         } else if (in_size == 0) {
 832                                 done_reading = 1;
 833                         }
 834                         infile_newdata(in_size);
 835
 836                         z.avail_in += in_size;
 837                         needmore = 0;
 838
 839                         in_tot += in_size;
 840                 }
 841                 if (z.avail_in == 0) {
 842                         if (done_reading && state != GZSTATE_MAGIC0) {
 843                                 maybe_warnx("%s: unexpected end of file",
 844                                             filename);
 845                                 goto stop_and_fail;
 846                         }
 847                         goto stop;
 848                 }
 849                 switch (state) {
 850                 case GZSTATE_MAGIC0:
 851                         if (*z.next_in != GZIP_MAGIC0) {
 852                                 if (in_tot > 0) {
 853                                         maybe_warnx("%s: trailing garbage "
 854                                                     "ignored", filename);
 855                                         exit_value = 2;
 856                                         goto stop;
 857                                 }
 858                                 maybe_warnx("input not gziped (MAGIC0)");
 859                                 goto stop_and_fail;
 860                         }
 861                         ADVANCE();
 862                         state++;
 863                         out_sub_tot = 0;
 864                         crc = crc32(0L, Z_NULL, 0);
 865                         break;
 866
 867                 case GZSTATE_MAGIC1:
 868                         if (*z.next_in != GZIP_MAGIC1 &&
 869                             *z.next_in != GZIP_OMAGIC1) {
 870                                 maybe_warnx("input not gziped (MAGIC1)");
 871                                 goto stop_and_fail;
 872                         }
 873                         ADVANCE();
 874                         state++;
 875                         break;
 876
 877                 case GZSTATE_METHOD:
 878                         if (*z.next_in != Z_DEFLATED) {
 879                                 maybe_warnx("unknown compression method");
 880                                 goto stop_and_fail;
 881                         }
 882                         ADVANCE();
 883                         state++;
 884                         break;
 885
 886                 case GZSTATE_FLAGS:
 887                         flags = *z.next_in;
 888                         ADVANCE();
 889                         skip_count = 6;
 890                         state++;
 891                         break;
 892
 893                 case GZSTATE_SKIPPING:
 894                         if (skip_count > 0) {
 895                                 skip_count--;
 896                                 ADVANCE();
 897                         } else
 898                                 state++;
 899                         break;
 900
 901                 case GZSTATE_EXTRA:
 902                         if ((flags & EXTRA_FIELD) == 0) {
 903                                 state = GZSTATE_ORIGNAME;
 904                                 break;
 905                         }
 906                         skip_count = *z.next_in;
 907                         ADVANCE();
 908                         state++;
 909                         break;
 910
 911                 case GZSTATE_EXTRA2:
 912                         skip_count |= ((*z.next_in) << 8);
 913                         ADVANCE();
 914                         state++;
 915                         break;
 916
 917                 case GZSTATE_EXTRA3:
 918                         if (skip_count > 0) {
 919                                 skip_count--;
 920                                 ADVANCE();
 921                         } else
 922                                 state++;
 923                         break;
 924
 925                 case GZSTATE_ORIGNAME:
 926                         if ((flags & ORIG_NAME) == 0) {
 927                                 state++;
 928                                 break;
 929                         }
 930                         if (*z.next_in == 0)
 931                                 state++;
 932                         ADVANCE();
 933                         break;
 934
 935                 case GZSTATE_COMMENT:
 936                         if ((flags & COMMENT) == 0) {
 937                                 state++;
 938                                 break;
 939                         }
 940                         if (*z.next_in == 0)
 941                                 state++;
 942                         ADVANCE();
 943                         break;
 944
 945                 case GZSTATE_HEAD_CRC1:
 946                         if (flags & HEAD_CRC)
 947                                 skip_count = 2;
 948                         else
 949                                 skip_count = 0;
 950                         state++;
 951                         break;
 952
 953                 case GZSTATE_HEAD_CRC2:
 954                         if (skip_count > 0) {
 955                                 skip_count--;
 956                                 ADVANCE();
 957                         } else
 958                                 state++;
 959                         break;
 960
 961                 case GZSTATE_INIT:
 962                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 963                                 maybe_warnx("failed to inflateInit");
 964                                 goto stop_and_fail;
 965                         }
 966                         state++;
 967                         break;
 968
 969                 case GZSTATE_READ:
 970                         error = inflate(&z, Z_FINISH);
 971                         switch (error) {
 972                         /* Z_BUF_ERROR goes with Z_FINISH... */
 973                         case Z_BUF_ERROR:
 974                                 if (z.avail_out > 0 && !done_reading)
 975                                         continue;
 976
 977                         case Z_STREAM_END:
 978                         case Z_OK:
 979                                 break;
 980
 981                         case Z_NEED_DICT:
 982                                 maybe_warnx("Z_NEED_DICT error");
 983                                 goto stop_and_fail;
 984                         case Z_DATA_ERROR:
 985                                 maybe_warnx("data stream error");
 986                                 goto stop_and_fail;
 987                         case Z_STREAM_ERROR:
 988                                 maybe_warnx("internal stream error");
 989                                 goto stop_and_fail;
 990                         case Z_MEM_ERROR:
 991                                 maybe_warnx("memory allocation error");
 992                                 goto stop_and_fail;
 993
 994                         default:
 995                                 maybe_warn("unknown error from inflate(): %d",
 996                                     error);
 997                         }
 998                         wr = BUFLEN - z.avail_out;
 999
1000                         if (wr != 0) {
1001                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
1002                                 if (
1003 #ifndef SMALL
1004                                     /* don't write anything with -t */
1005                                     tflag == 0 &&
1006 #endif
1007                                     write_retry(out, outbufp, wr) != wr) {
1008                                         maybe_warn("error writing to output");
1009                                         goto stop_and_fail;
1010                                 }
1011
1012                                 out_tot += wr;
1013                                 out_sub_tot += wr;
1014                         }
1015
1016                         if (error == Z_STREAM_END) {
1017                                 inflateEnd(&z);
1018                                 state++;
1019                         }
1020
1021                         z.next_out = (unsigned char *)outbufp;
1022                         z.avail_out = BUFLEN;
1023
1024                         break;
1025                 case GZSTATE_CRC:
1026                         {
1027                                 uLong origcrc;
1028
1029                                 if (z.avail_in < 4) {
1030                                         if (!done_reading) {
1031                                                 needmore = 1;
1032                                                 continue;
1033                                         }
1034                                         maybe_warnx("truncated input");
1035                                         goto stop_and_fail;
1036                                 }
1037                                 origcrc = le32dec(&z.next_in[0]);
1038                                 if (origcrc != crc) {
1039                                         maybe_warnx("invalid compressed"
1040                                              " data--crc error");
1041                                         goto stop_and_fail;
1042                                 }
1043                         }
1044
1045                         z.avail_in -= 4;
1046                         z.next_in += 4;
1047
1048                         if (!z.avail_in && done_reading) {
1049                                 goto stop;
1050                         }
1051                         state++;
1052                         break;
1053                 case GZSTATE_LEN:
1054                         {
1055                                 uLong origlen;
1056
1057                                 if (z.avail_in < 4) {
1058                                         if (!done_reading) {
1059                                                 needmore = 1;
1060                                                 continue;
1061                                         }
1062                                         maybe_warnx("truncated input");
1063                                         goto stop_and_fail;
1064                                 }
1065                                 origlen = le32dec(&z.next_in[0]);
1066
1067                                 if (origlen != out_sub_tot) {
1068                                         maybe_warnx("invalid compressed"
1069                                              " data--length error");
1070                                         goto stop_and_fail;
1071                                 }
1072                         }
1073
1074                         z.avail_in -= 4;
1075                         z.next_in += 4;
1076
1077                         if (error < 0) {
1078                                 maybe_warnx("decompression error");
1079                                 goto stop_and_fail;
1080                         }
1081                         state = GZSTATE_MAGIC0;
1082                         break;
1083                 }
1084                 continue;
1085 stop_and_fail:
1086                 out_tot = -1;
1087 stop:
1088                 break;
1089         }
1090         if (state > GZSTATE_INIT)
1091                 inflateEnd(&z);
1092
1093         free(inbufp);
1094 out1:
1095         free(outbufp);
1096 out2:
1097         if (gsizep)
1098                 *gsizep = in_tot;
1099         return (out_tot);
1100 }
1101
1102 #ifndef SMALL
1103 /*
1104  * set the owner, mode, flags & utimes using the given file descriptor.
1105  * file is only used in possible warning messages.
1106  */
1107 static void
1108 copymodes(int fd, const struct stat *sbp, const char *file)
1109 {
1110         struct timespec times[2];
1111         struct stat sb;
1112
1113         /*
1114          * If we have no info on the input, give this file some
1115          * default values and return..
1116          */
1117         if (sbp == NULL) {
1118                 mode_t mask = umask(022);
1119
1120                 (void)fchmod(fd, DEFFILEMODE & ~mask);
1121                 (void)umask(mask);
1122                 return;
1123         }
1124         sb = *sbp;
1125
1126         /* if the chown fails, remove set-id bits as-per compress(1) */
1127         if (fchown(fd, sb.st_uid, sb.st_gid) < 0) {
1128                 if (errno != EPERM)
1129                         maybe_warn("couldn't fchown: %s", file);
1130                 sb.st_mode &= ~(S_ISUID|S_ISGID);
1131         }
1132
1133         /* we only allow set-id and the 9 normal permission bits */
1134         sb.st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
1135         if (fchmod(fd, sb.st_mode) < 0)
1136                 maybe_warn("couldn't fchmod: %s", file);
1137
1138         times[0] = sb.st_atim;
1139         times[1] = sb.st_mtim;
1140         if (futimens(fd, times) < 0)
1141                 maybe_warn("couldn't futimens: %s", file);
1142
1143         /* only try flags if they exist already */
1144         if (sb.st_flags != 0 && fchflags(fd, sb.st_flags) < 0)
1145                 maybe_warn("couldn't fchflags: %s", file);
1146 }
1147 #endif
1148
1149 /* what sort of file is this? */
1150 static enum filetype
1151 file_gettype(u_char *buf)
1152 {
1153
1154         if (buf[0] == GZIP_MAGIC0 &&
1155             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1156                 return FT_GZIP;
1157         else
1158 #ifndef NO_BZIP2_SUPPORT
1159         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1160             buf[3] >= '0' && buf[3] <= '9')
1161                 return FT_BZIP2;
1162         else
1163 #endif
1164 #ifndef NO_COMPRESS_SUPPORT
1165         if (memcmp(buf, Z_MAGIC, 2) == 0)
1166                 return FT_Z;
1167         else
1168 #endif
1169 #ifndef NO_PACK_SUPPORT
1170         if (memcmp(buf, PACK_MAGIC, 2) == 0)
1171                 return FT_PACK;
1172         else
1173 #endif
1174 #ifndef NO_XZ_SUPPORT
1175         if (memcmp(buf, XZ_MAGIC, 4) == 0)      /* XXX: We only have 4 bytes */
1176                 return FT_XZ;
1177         else
1178 #endif
1179 #ifndef NO_LZ_SUPPORT
1180         if (memcmp(buf, LZ_MAGIC, 4) == 0)
1181                 return FT_LZ;
1182         else
1183 #endif
1184                 return FT_UNKNOWN;
1185 }
1186
1187 #ifndef SMALL
1188 /* check the outfile is OK. */
1189 static int
1190 check_outfile(const char *outfile)
1191 {
1192         struct stat sb;
1193         int ok = 1;
1194
1195         if (lflag == 0 && stat(outfile, &sb) == 0) {
1196                 if (fflag)
1197                         unlink(outfile);
1198                 else if (isatty(STDIN_FILENO)) {
1199                         char ans[10] = { 'n', '\0' };   /* default */
1200
1201                         fprintf(stderr, "%s already exists -- do you wish to "
1202                                         "overwrite (y or n)? " , outfile);
1203                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1204                         if (ans[0] != 'y' && ans[0] != 'Y') {
1205                                 fprintf(stderr, "\tnot overwriting\n");
1206                                 ok = 0;
1207                         } else
1208                                 unlink(outfile);
1209                 } else {
1210                         maybe_warnx("%s already exists -- skipping", outfile);
1211                         ok = 0;
1212                 }
1213         }
1214         return ok;
1215 }
1216
1217 static void
1218 unlink_input(const char *file, const struct stat *sb)
1219 {
1220         struct stat nsb;
1221
1222         if (kflag)
1223                 return;
1224         if (stat(file, &nsb) != 0)
1225                 /* Must be gone already */
1226                 return;
1227         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1228                 /* Definitely a different file */
1229                 return;
1230         unlink(file);
1231 }
1232
1233 static void
1234 got_sigint(int signo __unused)
1235 {
1236
1237         if (remove_file != NULL)
1238                 unlink(remove_file);
1239         _exit(2);
1240 }
1241
1242 static void
1243 got_siginfo(int signo __unused)
1244 {
1245
1246         print_info = 1;
1247 }
1248
1249 static void
1250 setup_signals(void)
1251 {
1252
1253         signal(SIGINFO, got_siginfo);
1254         signal(SIGINT, got_sigint);
1255 }
1256
1257 static  void
1258 infile_newdata(size_t newdata)
1259 {
1260
1261         infile_current += newdata;
1262 }
1263 #endif
1264
1265 static  void
1266 infile_set(const char *newinfile, off_t total)
1267 {
1268
1269         if (newinfile)
1270                 infile = newinfile;
1271 #ifndef SMALL
1272         infile_total = total;
1273 #endif
1274 }
1275
1276 static  void
1277 infile_clear(void)
1278 {
1279
1280         infile = NULL;
1281 #ifndef SMALL
1282         infile_total = infile_current = 0;
1283 #endif
1284 }
1285
1286 static const suffixes_t *
1287 check_suffix(char *file, int xlate)
1288 {
1289         const suffixes_t *s;
1290         int len = strlen(file);
1291         char *sp;
1292
1293         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1294                 /* if it doesn't fit in "a.suf", don't bother */
1295                 if (s->ziplen >= len)
1296                         continue;
1297                 sp = file + len - s->ziplen;
1298                 if (strcmp(s->zipped, sp) != 0)
1299                         continue;
1300                 if (xlate)
1301                         strcpy(sp, s->normal);
1302                 return s;
1303         }
1304         return NULL;
1305 }
1306
1307 /*
1308  * compress the given file: create a corresponding .gz file and remove the
1309  * original.
1310  */
1311 static off_t
1312 file_compress(char *file, char *outfile, size_t outsize)
1313 {
1314         int in;
1315         int out;
1316         off_t size, in_size;
1317 #ifndef SMALL
1318         struct stat isb, osb;
1319         const suffixes_t *suff;
1320 #endif
1321
1322         in = open(file, O_RDONLY);
1323         if (in == -1) {
1324                 maybe_warn("can't open %s", file);
1325                 return (-1);
1326         }
1327
1328 #ifndef SMALL
1329         if (fstat(in, &isb) != 0) {
1330                 maybe_warn("couldn't stat: %s", file);
1331                 close(in);
1332                 return (-1);
1333         }
1334 #endif
1335
1336 #ifndef SMALL
1337         if (fstat(in, &isb) != 0) {
1338                 close(in);
1339                 maybe_warn("can't stat %s", file);
1340                 return -1;
1341         }
1342         infile_set(file, isb.st_size);
1343 #endif
1344
1345         if (cflag == 0) {
1346 #ifndef SMALL
1347                 if (isb.st_nlink > 1 && fflag == 0) {
1348                         maybe_warnx("%s has %ju other link%s -- "
1349                                     "skipping", file,
1350                                     (uintmax_t)isb.st_nlink - 1,
1351                                     isb.st_nlink == 1 ? "" : "s");
1352                         close(in);
1353                         return -1;
1354                 }
1355
1356                 if (fflag == 0 && (suff = check_suffix(file, 0)) &&
1357                     suff->zipped[0] != 0) {
1358                         maybe_warnx("%s already has %s suffix -- unchanged",
1359                             file, suff->zipped);
1360                         close(in);
1361                         return (-1);
1362                 }
1363 #endif
1364
1365                 /* Add (usually) .gz to filename */
1366                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1367                     file, suffixes[0].zipped) >= outsize)
1368                         memcpy(outfile + outsize - suffixes[0].ziplen - 1,
1369                             suffixes[0].zipped, suffixes[0].ziplen + 1);
1370
1371 #ifndef SMALL
1372                 if (check_outfile(outfile) == 0) {
1373                         close(in);
1374                         return (-1);
1375                 }
1376 #endif
1377         }
1378
1379         if (cflag == 0) {
1380                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1381                 if (out == -1) {
1382                         maybe_warn("could not create output: %s", outfile);
1383                         fclose(stdin);
1384                         return (-1);
1385                 }
1386 #ifndef SMALL
1387                 remove_file = outfile;
1388 #endif
1389         } else
1390                 out = STDOUT_FILENO;
1391
1392         in_size = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1393
1394         (void)close(in);
1395
1396         /*
1397          * If there was an error, in_size will be -1.
1398          * If we compressed to stdout, just return the size.
1399          * Otherwise stat the file and check it is the correct size.
1400          * We only blow away the file if we can stat the output and it
1401          * has the expected size.
1402          */
1403         if (cflag != 0)
1404                 return in_size == -1 ? -1 : size;
1405
1406 #ifndef SMALL
1407         if (fstat(out, &osb) != 0) {
1408                 maybe_warn("couldn't stat: %s", outfile);
1409                 goto bad_outfile;
1410         }
1411
1412         if (osb.st_size != size) {
1413                 maybe_warnx("output file: %s wrong size (%ju != %ju), deleting",
1414                     outfile, (uintmax_t)osb.st_size, (uintmax_t)size);
1415                 goto bad_outfile;
1416         }
1417
1418         copymodes(out, &isb, outfile);
1419         remove_file = NULL;
1420 #endif
1421         if (close(out) == -1)
1422                 maybe_warn("couldn't close output");
1423
1424         /* output is good, ok to delete input */
1425         unlink_input(file, &isb);
1426         return (size);
1427
1428 #ifndef SMALL
1429     bad_outfile:
1430         if (close(out) == -1)
1431                 maybe_warn("couldn't close output");
1432
1433         maybe_warnx("leaving original %s", file);
1434         unlink(outfile);
1435         return (size);
1436 #endif
1437 }
1438
1439 /* uncompress the given file and remove the original */
1440 static off_t
1441 file_uncompress(char *file, char *outfile, size_t outsize)
1442 {
1443         struct stat isb, osb;
1444         off_t size;
1445         ssize_t rbytes;
1446         unsigned char header1[4];
1447         enum filetype method;
1448         int fd, ofd, zfd = -1;
1449         int error;
1450         size_t in_size;
1451 #ifndef SMALL
1452         ssize_t rv;
1453         time_t timestamp = 0;
1454         char name[PATH_MAX + 1];
1455 #endif
1456
1457         /* gather the old name info */
1458
1459         fd = open(file, O_RDONLY);
1460         if (fd < 0) {
1461                 maybe_warn("can't open %s", file);
1462                 goto lose;
1463         }
1464         if (fstat(fd, &isb) != 0) {
1465                 maybe_warn("can't stat %s", file);
1466                 goto lose;
1467         }
1468         if (S_ISREG(isb.st_mode))
1469                 in_size = isb.st_size;
1470         else
1471                 in_size = 0;
1472         infile_set(file, in_size);
1473
1474         strlcpy(outfile, file, outsize);
1475         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1476                 maybe_warnx("%s: unknown suffix -- ignored", file);
1477                 goto lose;
1478         }
1479
1480         rbytes = read(fd, header1, sizeof header1);
1481         if (rbytes != sizeof header1) {
1482                 /* we don't want to fail here. */
1483 #ifndef SMALL
1484                 if (fflag)
1485                         goto lose;
1486 #endif
1487                 if (rbytes == -1)
1488                         maybe_warn("can't read %s", file);
1489                 else
1490                         goto unexpected_EOF;
1491                 goto lose;
1492         }
1493         infile_newdata(rbytes);
1494
1495         method = file_gettype(header1);
1496 #ifndef SMALL
1497         if (fflag == 0 && method == FT_UNKNOWN) {
1498                 maybe_warnx("%s: not in gzip format", file);
1499                 goto lose;
1500         }
1501
1502 #endif
1503
1504 #ifndef SMALL
1505         if (method == FT_GZIP && Nflag) {
1506                 unsigned char ts[4];    /* timestamp */
1507
1508                 rv = pread(fd, ts, sizeof ts, GZIP_TIMESTAMP);
1509                 if (rv >= 0 && rv < (ssize_t)(sizeof ts))
1510                         goto unexpected_EOF;
1511                 if (rv == -1) {
1512                         if (!fflag)
1513                                 maybe_warn("can't read %s", file);
1514                         goto lose;
1515                 }
1516                 infile_newdata(rv);
1517                 timestamp = le32dec(&ts[0]);
1518
1519                 if (header1[3] & ORIG_NAME) {
1520                         rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
1521                         if (rbytes < 0) {
1522                                 maybe_warn("can't read %s", file);
1523                                 goto lose;
1524                         }
1525                         if (name[0] != '\0') {
1526                                 char *dp, *nf;
1527
1528                                 /* Make sure that name is NUL-terminated */
1529                                 name[rbytes] = '\0';
1530
1531                                 /* strip saved directory name */
1532                                 nf = strrchr(name, '/');
1533                                 if (nf == NULL)
1534                                         nf = name;
1535                                 else
1536                                         nf++;
1537
1538                                 /* preserve original directory name */
1539                                 dp = strrchr(file, '/');
1540                                 if (dp == NULL)
1541                                         dp = file;
1542                                 else
1543                                         dp++;
1544                                 snprintf(outfile, outsize, "%.*s%.*s",
1545                                                 (int) (dp - file),
1546                                                 file, (int) rbytes, nf);
1547                         }
1548                 }
1549         }
1550 #endif
1551         lseek(fd, 0, SEEK_SET);
1552
1553         if (cflag == 0 || lflag) {
1554 #ifndef SMALL
1555                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1556                         maybe_warnx("%s has %ju other links -- skipping",
1557                             file, (uintmax_t)isb.st_nlink - 1);
1558                         goto lose;
1559                 }
1560                 if (nflag == 0 && timestamp)
1561                         isb.st_mtime = timestamp;
1562                 if (check_outfile(outfile) == 0)
1563                         goto lose;
1564 #endif
1565         }
1566
1567         if (cflag)
1568                 zfd = STDOUT_FILENO;
1569         else if (lflag)
1570                 zfd = -1;
1571         else {
1572                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1573                 if (zfd == STDOUT_FILENO) {
1574                         /* We won't close STDOUT_FILENO later... */
1575                         zfd = dup(zfd);
1576                         close(STDOUT_FILENO);
1577                 }
1578                 if (zfd == -1) {
1579                         maybe_warn("can't open %s", outfile);
1580                         goto lose;
1581                 }
1582                 remove_file = outfile;
1583         }
1584
1585         switch (method) {
1586 #ifndef NO_BZIP2_SUPPORT
1587         case FT_BZIP2:
1588                 /* XXX */
1589                 if (lflag) {
1590                         maybe_warnx("no -l with bzip2 files");
1591                         goto lose;
1592                 }
1593
1594                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1595                 break;
1596 #endif
1597
1598 #ifndef NO_COMPRESS_SUPPORT
1599         case FT_Z: {
1600                 FILE *in, *out;
1601
1602                 /* XXX */
1603                 if (lflag) {
1604                         maybe_warnx("no -l with Lempel-Ziv files");
1605                         goto lose;
1606                 }
1607
1608                 if ((in = zdopen(fd)) == NULL) {
1609                         maybe_warn("zdopen for read: %s", file);
1610                         goto lose;
1611                 }
1612
1613                 out = fdopen(dup(zfd), "w");
1614                 if (out == NULL) {
1615                         maybe_warn("fdopen for write: %s", outfile);
1616                         fclose(in);
1617                         goto lose;
1618                 }
1619
1620                 size = zuncompress(in, out, NULL, 0, NULL);
1621                 /* need to fclose() if ferror() is true... */
1622                 error = ferror(in);
1623                 if (error | fclose(in)) {
1624                         if (error)
1625                                 maybe_warn("failed infile");
1626                         else
1627                                 maybe_warn("failed infile fclose");
1628                         if (cflag == 0)
1629                                 unlink(outfile);
1630                         (void)fclose(out);
1631                         goto lose;
1632                 }
1633                 if (fclose(out) != 0) {
1634                         maybe_warn("failed outfile fclose");
1635                         if (cflag == 0)
1636                                 unlink(outfile);
1637                         goto lose;
1638                 }
1639                 break;
1640         }
1641 #endif
1642
1643 #ifndef NO_PACK_SUPPORT
1644         case FT_PACK:
1645                 if (lflag) {
1646                         maybe_warnx("no -l with packed files");
1647                         goto lose;
1648                 }
1649
1650                 size = unpack(fd, zfd, NULL, 0, NULL);
1651                 break;
1652 #endif
1653
1654 #ifndef NO_XZ_SUPPORT
1655         case FT_XZ:
1656                 if (lflag) {
1657                         size = unxz_len(fd);
1658                         print_list_out(in_size, size, file);
1659                         return -1;
1660                 }
1661                 size = unxz(fd, zfd, NULL, 0, NULL);
1662                 break;
1663 #endif
1664
1665 #ifndef NO_LZ_SUPPORT
1666         case FT_LZ:
1667                 if (lflag) {
1668                         maybe_warnx("no -l with lzip files");
1669                         goto lose;
1670                 }
1671                 size = unlz(fd, zfd, NULL, 0, NULL);
1672                 break;
1673 #endif
1674 #ifndef SMALL
1675         case FT_UNKNOWN:
1676                 if (lflag) {
1677                         maybe_warnx("no -l for unknown filetypes");
1678                         goto lose;
1679                 }
1680                 size = cat_fd(NULL, 0, NULL, fd);
1681                 break;
1682 #endif
1683         default:
1684                 if (lflag) {
1685                         print_list(fd, in_size, outfile, isb.st_mtime);
1686                         close(fd);
1687                         return -1;      /* XXX */
1688                 }
1689
1690                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1691                 break;
1692         }
1693
1694         if (close(fd) != 0)
1695                 maybe_warn("couldn't close input");
1696         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1697                 maybe_warn("couldn't close output");
1698
1699         if (size == -1) {
1700                 if (cflag == 0)
1701                         unlink(outfile);
1702                 maybe_warnx("%s: uncompress failed", file);
1703                 return -1;
1704         }
1705
1706         /* if testing, or we uncompressed to stdout, this is all we need */
1707 #ifndef SMALL
1708         if (tflag)
1709                 return size;
1710 #endif
1711         /* if we are uncompressing to stdin, don't remove the file. */
1712         if (cflag)
1713                 return size;
1714
1715         /*
1716          * if we create a file...
1717          */
1718         /*
1719          * if we can't stat the file don't remove the file.
1720          */
1721
1722         ofd = open(outfile, O_RDWR, 0);
1723         if (ofd == -1) {
1724                 maybe_warn("couldn't open (leaving original): %s",
1725                            outfile);
1726                 return -1;
1727         }
1728         if (fstat(ofd, &osb) != 0) {
1729                 maybe_warn("couldn't stat (leaving original): %s",
1730                            outfile);
1731                 close(ofd);
1732                 return -1;
1733         }
1734         if (osb.st_size != size) {
1735                 maybe_warnx("stat gave different size: %ju != %ju (leaving original)",
1736                     (uintmax_t)size, (uintmax_t)osb.st_size);
1737                 close(ofd);
1738                 unlink(outfile);
1739                 return -1;
1740         }
1741 #ifndef SMALL
1742         copymodes(ofd, &isb, outfile);
1743         remove_file = NULL;
1744 #endif
1745         close(ofd);
1746         unlink_input(file, &isb);
1747         return size;
1748
1749     unexpected_EOF:
1750         maybe_warnx("%s: unexpected end of file", file);
1751     lose:
1752         if (fd != -1)
1753                 close(fd);
1754         if (zfd != -1 && zfd != STDOUT_FILENO)
1755                 close(zfd);
1756         return -1;
1757 }
1758
1759 #ifndef SMALL
1760 static void
1761 check_siginfo(void)
1762 {
1763         if (print_info == 0)
1764                 return;
1765         if (infile) {
1766                 if (infile_total) {
1767                         int pcent = (int)((100.0 * infile_current) / infile_total);
1768
1769                         fprintf(stderr, "%s: done %llu/%llu bytes %d%%\n",
1770                                 infile, (unsigned long long)infile_current,
1771                                 (unsigned long long)infile_total, pcent);
1772                 } else
1773                         fprintf(stderr, "%s: done %llu bytes\n",
1774                                 infile, (unsigned long long)infile_current);
1775         }
1776         print_info = 0;
1777 }
1778
1779 static off_t
1780 cat_fd(unsigned char * prepend, size_t count, off_t *gsizep, int fd)
1781 {
1782         char buf[BUFLEN];
1783         off_t in_tot;
1784         ssize_t w;
1785
1786         in_tot = count;
1787         w = write_retry(STDOUT_FILENO, prepend, count);
1788         if (w == -1 || (size_t)w != count) {
1789                 maybe_warn("write to stdout");
1790                 return -1;
1791         }
1792         for (;;) {
1793                 ssize_t rv;
1794
1795                 rv = read(fd, buf, sizeof buf);
1796                 if (rv == 0)
1797                         break;
1798                 if (rv < 0) {
1799                         maybe_warn("read from fd %d", fd);
1800                         break;
1801                 }
1802                 infile_newdata(rv);
1803
1804                 if (write_retry(STDOUT_FILENO, buf, rv) != rv) {
1805                         maybe_warn("write to stdout");
1806                         break;
1807                 }
1808                 in_tot += rv;
1809         }
1810
1811         if (gsizep)
1812                 *gsizep = in_tot;
1813         return (in_tot);
1814 }
1815 #endif
1816
1817 static void
1818 handle_stdin(void)
1819 {
1820         struct stat isb;
1821         unsigned char header1[4];
1822         size_t in_size;
1823         off_t usize, gsize;
1824         enum filetype method;
1825         ssize_t bytes_read;
1826 #ifndef NO_COMPRESS_SUPPORT
1827         FILE *in;
1828 #endif
1829
1830 #ifndef SMALL
1831         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1832                 maybe_warnx("standard input is a terminal -- ignoring");
1833                 goto out;
1834         }
1835 #endif
1836
1837         if (fstat(STDIN_FILENO, &isb) < 0) {
1838                 maybe_warn("fstat");
1839                 goto out;
1840         }
1841         if (S_ISREG(isb.st_mode))
1842                 in_size = isb.st_size;
1843         else
1844                 in_size = 0;
1845         infile_set("(stdin)", in_size);
1846
1847         if (lflag) {
1848                 print_list(STDIN_FILENO, in_size, infile, isb.st_mtime);
1849                 goto out;
1850         }
1851
1852         bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
1853         if (bytes_read == -1) {
1854                 maybe_warn("can't read stdin");
1855                 goto out;
1856         } else if (bytes_read != sizeof(header1)) {
1857                 maybe_warnx("(stdin): unexpected end of file");
1858                 goto out;
1859         }
1860
1861         method = file_gettype(header1);
1862         switch (method) {
1863         default:
1864 #ifndef SMALL
1865                 if (fflag == 0) {
1866                         maybe_warnx("unknown compression format");
1867                         goto out;
1868                 }
1869                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1870                 break;
1871 #endif
1872         case FT_GZIP:
1873                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1874                               (char *)header1, sizeof header1, &gsize, "(stdin)");
1875                 break;
1876 #ifndef NO_BZIP2_SUPPORT
1877         case FT_BZIP2:
1878                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1879                                 (char *)header1, sizeof header1, &gsize);
1880                 break;
1881 #endif
1882 #ifndef NO_COMPRESS_SUPPORT
1883         case FT_Z:
1884                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1885                         maybe_warnx("zopen of stdin");
1886                         goto out;
1887                 }
1888
1889                 usize = zuncompress(in, stdout, (char *)header1,
1890                     sizeof header1, &gsize);
1891                 fclose(in);
1892                 break;
1893 #endif
1894 #ifndef NO_PACK_SUPPORT
1895         case FT_PACK:
1896                 usize = unpack(STDIN_FILENO, STDOUT_FILENO,
1897                                (char *)header1, sizeof header1, &gsize);
1898                 break;
1899 #endif
1900 #ifndef NO_XZ_SUPPORT
1901         case FT_XZ:
1902                 usize = unxz(STDIN_FILENO, STDOUT_FILENO,
1903                              (char *)header1, sizeof header1, &gsize);
1904                 break;
1905 #endif
1906 #ifndef NO_LZ_SUPPORT
1907         case FT_LZ:
1908                 usize = unlz(STDIN_FILENO, STDOUT_FILENO,
1909                              (char *)header1, sizeof header1, &gsize);
1910                 break;
1911 #endif
1912         }
1913
1914 #ifndef SMALL
1915         if (vflag && !tflag && usize != -1 && gsize != -1)
1916                 print_verbage(NULL, NULL, usize, gsize);
1917         if (vflag && tflag)
1918                 print_test("(stdin)", usize != -1);
1919 #else
1920         (void)&usize;
1921 #endif
1922
1923 out:
1924         infile_clear();
1925 }
1926
1927 static void
1928 handle_stdout(void)
1929 {
1930         off_t gsize;
1931 #ifndef SMALL
1932         off_t usize;
1933         struct stat sb;
1934         time_t systime;
1935         uint32_t mtime;
1936         int ret;
1937
1938         infile_set("(stdout)", 0);
1939
1940         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1941                 maybe_warnx("standard output is a terminal -- ignoring");
1942                 return;
1943         }
1944
1945         /* If stdin is a file use its mtime, otherwise use current time */
1946         ret = fstat(STDIN_FILENO, &sb);
1947         if (ret < 0) {
1948                 maybe_warn("Can't stat stdin");
1949                 return;
1950         }
1951
1952         if (S_ISREG(sb.st_mode)) {
1953                 infile_set("(stdout)", sb.st_size);
1954                 mtime = (uint32_t)sb.st_mtime;
1955         } else {
1956                 systime = time(NULL);
1957                 if (systime == -1) {
1958                         maybe_warn("time");
1959                         return;
1960                 }
1961                 mtime = (uint32_t)systime;
1962         }
1963
1964         usize =
1965 #endif
1966                 gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", mtime);
1967 #ifndef SMALL
1968         if (vflag && !tflag && usize != -1 && gsize != -1)
1969                 print_verbage(NULL, NULL, usize, gsize);
1970 #endif
1971 }
1972
1973 /* do what is asked for, for the path name */
1974 static void
1975 handle_pathname(char *path)
1976 {
1977         char *opath = path, *s = NULL;
1978         ssize_t len;
1979         int slen;
1980         struct stat sb;
1981
1982         /* check for stdout/stdin */
1983         if (path[0] == '-' && path[1] == '\0') {
1984                 if (dflag)
1985                         handle_stdin();
1986                 else
1987                         handle_stdout();
1988                 return;
1989         }
1990
1991 retry:
1992         if (stat(path, &sb) != 0 || (fflag == 0 && cflag == 0 &&
1993             lstat(path, &sb) != 0)) {
1994                 /* lets try <path>.gz if we're decompressing */
1995                 if (dflag && s == NULL && errno == ENOENT) {
1996                         len = strlen(path);
1997                         slen = suffixes[0].ziplen;
1998                         s = malloc(len + slen + 1);
1999                         if (s == NULL)
2000                                 maybe_err("malloc");
2001                         memcpy(s, path, len);
2002                         memcpy(s + len, suffixes[0].zipped, slen + 1);
2003                         path = s;
2004                         goto retry;
2005                 }
2006                 maybe_warn("can't stat: %s", opath);
2007                 goto out;
2008         }
2009
2010         if (S_ISDIR(sb.st_mode)) {
2011 #ifndef SMALL
2012                 if (rflag)
2013                         handle_dir(path);
2014                 else
2015 #endif
2016                         maybe_warnx("%s is a directory", path);
2017                 goto out;
2018         }
2019
2020         if (S_ISREG(sb.st_mode))
2021                 handle_file(path, &sb);
2022         else
2023                 maybe_warnx("%s is not a regular file", path);
2024
2025 out:
2026         if (s)
2027                 free(s);
2028 }
2029
2030 /* compress/decompress a file */
2031 static void
2032 handle_file(char *file, struct stat *sbp)
2033 {
2034         off_t usize, gsize;
2035         char    outfile[PATH_MAX];
2036
2037         infile_set(file, sbp->st_size);
2038         if (dflag) {
2039                 usize = file_uncompress(file, outfile, sizeof(outfile));
2040 #ifndef SMALL
2041                 if (vflag && tflag)
2042                         print_test(file, usize != -1);
2043 #endif
2044                 if (usize == -1)
2045                         return;
2046                 gsize = sbp->st_size;
2047         } else {
2048                 gsize = file_compress(file, outfile, sizeof(outfile));
2049                 if (gsize == -1)
2050                         return;
2051                 usize = sbp->st_size;
2052         }
2053         infile_clear();
2054
2055 #ifndef SMALL
2056         if (vflag && !tflag)
2057                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
2058 #endif
2059 }
2060
2061 #ifndef SMALL
2062 /* this is used with -r to recursively descend directories */
2063 static void
2064 handle_dir(char *dir)
2065 {
2066         char *path_argv[2];
2067         FTS *fts;
2068         FTSENT *entry;
2069
2070         path_argv[0] = dir;
2071         path_argv[1] = 0;
2072         fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
2073         if (fts == NULL) {
2074                 warn("couldn't fts_open %s", dir);
2075                 return;
2076         }
2077
2078         while ((entry = fts_read(fts))) {
2079                 switch(entry->fts_info) {
2080                 case FTS_D:
2081                 case FTS_DP:
2082                         continue;
2083
2084                 case FTS_DNR:
2085                 case FTS_ERR:
2086                 case FTS_NS:
2087                         maybe_warn("%s", entry->fts_path);
2088                         continue;
2089                 case FTS_F:
2090                         handle_file(entry->fts_path, entry->fts_statp);
2091                 }
2092         }
2093         (void)fts_close(fts);
2094 }
2095 #endif
2096
2097 /* print a ratio - size reduction as a fraction of uncompressed size */
2098 static void
2099 print_ratio(off_t in, off_t out, FILE *where)
2100 {
2101         int percent10;  /* 10 * percent */
2102         off_t diff;
2103         char buff[8];
2104         int len;
2105
2106         diff = in - out/2;
2107         if (in == 0 && out == 0)
2108                 percent10 = 0;
2109         else if (diff < 0)
2110                 /*
2111                  * Output is more than double size of input! print -99.9%
2112                  * Quite possibly we've failed to get the original size.
2113                  */
2114                 percent10 = -999;
2115         else {
2116                 /*
2117                  * We only need 12 bits of result from the final division,
2118                  * so reduce the values until a 32bit division will suffice.
2119                  */
2120                 while (in > 0x100000) {
2121                         diff >>= 1;
2122                         in >>= 1;
2123                 }
2124                 if (in != 0)
2125                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
2126                 else
2127                         percent10 = 0;
2128         }
2129
2130         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
2131         /* Move the '.' to before the last digit */
2132         buff[len - 1] = buff[len - 2];
2133         buff[len - 2] = '.';
2134         fprintf(where, "%5s%%", buff);
2135 }
2136
2137 #ifndef SMALL
2138 /* print compression statistics, and the new name (if there is one!) */
2139 static void
2140 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
2141 {
2142         if (file)
2143                 fprintf(stderr, "%s:%s  ", file,
2144                     strlen(file) < 7 ? "\t\t" : "\t");
2145         print_ratio(usize, gsize, stderr);
2146         if (nfile)
2147                 fprintf(stderr, " -- replaced with %s", nfile);
2148         fprintf(stderr, "\n");
2149         fflush(stderr);
2150 }
2151
2152 /* print test results */
2153 static void
2154 print_test(const char *file, int ok)
2155 {
2156
2157         if (exit_value == 0 && ok == 0)
2158                 exit_value = 1;
2159         fprintf(stderr, "%s:%s  %s\n", file,
2160             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
2161         fflush(stderr);
2162 }
2163 #endif
2164
2165 /* print a file's info ala --list */
2166 /* eg:
2167   compressed uncompressed  ratio uncompressed_name
2168       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
2169 */
2170 static void
2171 print_list(int fd, off_t out, const char *outfile, time_t ts)
2172 {
2173         static int first = 1;
2174 #ifndef SMALL
2175         static off_t in_tot, out_tot;
2176         uint32_t crc = 0;
2177 #endif
2178         off_t in = 0, rv;
2179
2180         if (first) {
2181 #ifndef SMALL
2182                 if (vflag)
2183                         printf("method  crc     date  time  ");
2184 #endif
2185                 if (qflag == 0)
2186                         printf("  compressed uncompressed  "
2187                                "ratio uncompressed_name\n");
2188         }
2189         first = 0;
2190
2191         /* print totals? */
2192 #ifndef SMALL
2193         if (fd == -1) {
2194                 in = in_tot;
2195                 out = out_tot;
2196         } else
2197 #endif
2198         {
2199                 /* read the last 4 bytes - this is the uncompressed size */
2200                 rv = lseek(fd, (off_t)(-8), SEEK_END);
2201                 if (rv != -1) {
2202                         unsigned char buf[8];
2203                         uint32_t usize;
2204
2205                         rv = read(fd, (char *)buf, sizeof(buf));
2206                         if (rv == -1)
2207                                 maybe_warn("read of uncompressed size");
2208                         else if (rv != sizeof(buf))
2209                                 maybe_warnx("read of uncompressed size");
2210
2211                         else {
2212                                 usize = le32dec(&buf[4]);
2213                                 in = (off_t)usize;
2214 #ifndef SMALL
2215                                 crc = le32dec(&buf[0]);
2216 #endif
2217                         }
2218                 }
2219         }
2220
2221 #ifndef SMALL
2222         if (vflag && fd == -1)
2223                 printf("                            ");
2224         else if (vflag) {
2225                 char *date = ctime(&ts);
2226
2227                 /* skip the day, 1/100th second, and year */
2228                 date += 4;
2229                 date[12] = 0;
2230                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
2231         }
2232         in_tot += in;
2233         out_tot += out;
2234 #else
2235         (void)&ts;      /* XXX */
2236 #endif
2237         print_list_out(out, in, outfile);
2238 }
2239
2240 static void
2241 print_list_out(off_t out, off_t in, const char *outfile)
2242 {
2243         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
2244         print_ratio(in, out, stdout);
2245         printf(" %s\n", outfile);
2246 }
2247
2248 /* display the usage of NetBSD gzip */
2249 static void
2250 usage(void)
2251 {
2252
2253         fprintf(stderr, "%s\n", gzip_version);
2254         fprintf(stderr,
2255 #ifdef SMALL
2256     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n",
2257 #else
2258     "usage: %s [-123456789acdfhklLNnqrtVv] [-S .suffix] [<file> [<file> ...]]\n"
2259     " -1 --fast            fastest (worst) compression\n"
2260     " -2 .. -8             set compression level\n"
2261     " -9 --best            best (slowest) compression\n"
2262     " -c --stdout          write to stdout, keep original files\n"
2263     "    --to-stdout\n"
2264     " -d --decompress      uncompress files\n"
2265     "    --uncompress\n"
2266     " -f --force           force overwriting & compress links\n"
2267     " -h --help            display this help\n"
2268     " -k --keep            don't delete input files during operation\n"
2269     " -l --list            list compressed file contents\n"
2270     " -N --name            save or restore original file name and time stamp\n"
2271     " -n --no-name         don't save original file name or time stamp\n"
2272     " -q --quiet           output no warnings\n"
2273     " -r --recursive       recursively compress files in directories\n"
2274     " -S .suf              use suffix .suf instead of .gz\n"
2275     "    --suffix .suf\n"
2276     " -t --test            test compressed file\n"
2277     " -V --version         display program version\n"
2278     " -v --verbose         print extra statistics\n",
2279 #endif
2280             getprogname());
2281         exit(0);
2282 }
2283
2284 #ifndef SMALL
2285 /* display the license information of FreeBSD gzip */
2286 static void
2287 display_license(void)
2288 {
2289
2290         fprintf(stderr, "%s (based on NetBSD gzip 20150113)\n", gzip_version);
2291         fprintf(stderr, "%s\n", gzip_copyright);
2292         exit(0);
2293 }
2294 #endif
2295
2296 /* display the version of NetBSD gzip */
2297 static void
2298 display_version(void)
2299 {
2300
2301         fprintf(stderr, "%s\n", gzip_version);
2302         exit(0);
2303 }
2304
2305 #ifndef NO_BZIP2_SUPPORT
2306 #include "unbzip2.c"
2307 #endif
2308 #ifndef NO_COMPRESS_SUPPORT
2309 #include "zuncompress.c"
2310 #endif
2311 #ifndef NO_PACK_SUPPORT
2312 #include "unpack.c"
2313 #endif
2314 #ifndef NO_XZ_SUPPORT
2315 #include "unxz.c"
2316 #endif
2317 #ifndef NO_LZ_SUPPORT
2318 #include "unlz.c"
2319 #endif
2320
2321 static ssize_t
2322 read_retry(int fd, void *buf, size_t sz)
2323 {
2324         char *cp = buf;
2325         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2326
2327         while (left > 0) {
2328                 ssize_t ret;
2329
2330                 ret = read(fd, cp, left);
2331                 if (ret == -1) {
2332                         return ret;
2333                 } else if (ret == 0) {
2334                         break; /* EOF */
2335                 }
2336                 cp += ret;
2337                 left -= ret;
2338         }
2339
2340         return sz - left;
2341 }
2342
2343 static ssize_t
2344 write_retry(int fd, const void *buf, size_t sz)
2345 {
2346         const char *cp = buf;
2347         size_t left = MIN(sz, (size_t) SSIZE_MAX);
2348
2349         while (left > 0) {
2350                 ssize_t ret;
2351
2352                 ret = write(fd, cp, left);
2353                 if (ret == -1) {
2354                         return ret;
2355                 } else if (ret == 0) {
2356                         abort();        /* Can't happen */
2357                 }
2358                 cp += ret;
2359                 left -= ret;
2360         }
2361
2362         return sz - left;
2363 }