archival/bbunzip.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Common code for gunzip-like applets
   4  *
   5  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   6  */
   7 #include "libbb.h"
   8 #include "bb_archive.h"
   9
  10 /* lzop_main() uses bbunpack(), need this: */
  11 //kbuild:lib-$(CONFIG_LZOP) += bbunzip.o
  12 //kbuild:lib-$(CONFIG_LZOPCAT) += bbunzip.o
  13 //kbuild:lib-$(CONFIG_UNLZOP) += bbunzip.o
  14 /* bzip2_main() too: */
  15 //kbuild:lib-$(CONFIG_FEATURE_BZIP2_DECOMPRESS) += bbunzip.o
  16 /* gzip_main() too: */
  17 //kbuild:lib-$(CONFIG_FEATURE_GZIP_DECOMPRESS) += bbunzip.o
  18
  19 /* Note: must be kept in sync with archival/lzop.c */
  20 enum {
  21         OPT_STDOUT     = 1 << 0,
  22         OPT_FORCE      = 1 << 1,
  23         /* only some decompressors: */
  24         OPT_VERBOSE    = 1 << 2,
  25         OPT_QUIET      = 1 << 3,
  26         OPT_DECOMPRESS = 1 << 4,
  27         OPT_TEST       = 1 << 5,
  28         SEAMLESS_MAGIC = (1 << 31) * ENABLE_ZCAT * SEAMLESS_COMPRESSION,
  29 };
  30
  31 static
  32 int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
  33 {
  34         int fd = open3_or_warn(filename, flags, mode);
  35         if (fd < 0) {
  36                 return 1;
  37         }
  38         xmove_fd(fd, to_fd);
  39         return 0;
  40 }
  41
  42 char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
  43 {
  44         return xasprintf("%s.%s", filename, expected_ext);
  45 }
  46
  47 int FAST_FUNC bbunpack(char **argv,
  48         IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
  49         char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
  50         const char *expected_ext
  51 )
  52 {
  53         struct stat stat_buf;
  54         IF_DESKTOP(long long) int status = 0;
  55         char *filename, *new_name;
  56         smallint exitcode = 0;
  57         transformer_state_t xstate;
  58
  59         do {
  60                 /* NB: new_name is *maybe* malloc'ed! */
  61                 new_name = NULL;
  62                 filename = *argv; /* can be NULL - 'streaming' bunzip2 */
  63
  64                 if (filename && LONE_DASH(filename))
  65                         filename = NULL;
  66
  67                 /* Open src */
  68                 if (filename) {
  69                         if (!(option_mask32 & SEAMLESS_MAGIC)) {
  70                                 if (stat(filename, &stat_buf) != 0) {
  71  err_name:
  72                                         bb_simple_perror_msg(filename);
  73  err:
  74                                         exitcode = 1;
  75                                         goto free_name;
  76                                 }
  77                                 if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
  78                                         goto err;
  79                         } else {
  80                                 /* "clever zcat" with FILE */
  81                                 /* fail_if_not_compressed because zcat refuses uncompressed input */
  82                                 int fd = open_zipped(filename, /*fail_if_not_compressed:*/ 1);
  83                                 if (fd < 0)
  84                                         goto err_name;
  85                                 xmove_fd(fd, STDIN_FILENO);
  86                         }
  87                 } else
  88                 if (option_mask32 & SEAMLESS_MAGIC) {
  89                         /* "clever zcat" on stdin */
  90                         if (setup_unzip_on_fd(STDIN_FILENO, /*fail_if_not_compressed*/ 1))
  91                                 goto err;
  92                 }
  93
  94                 /* Special cases: test, stdout */
  95                 if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
  96                         if (option_mask32 & OPT_TEST)
  97                                 if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
  98                                         xfunc_die();
  99                         filename = NULL;
 100                 }
 101
 102                 /* Open dst if we are going to unpack to file */
 103                 if (filename) {
 104                         new_name = make_new_name(filename, expected_ext);
 105                         if (!new_name) {
 106                                 bb_error_msg("%s: unknown suffix - ignored", filename);
 107                                 goto err;
 108                         }
 109
 110                         /* -f: overwrite existing output files */
 111                         if (option_mask32 & OPT_FORCE) {
 112                                 unlink(new_name);
 113                         }
 114
 115                         /* O_EXCL: "real" bunzip2 doesn't overwrite files */
 116                         /* GNU gunzip does not bail out, but goes to next file */
 117                         if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
 118                                         stat_buf.st_mode))
 119                                 goto err;
 120                 }
 121
 122                 /* Check that the input is sane */
 123                 if (!(option_mask32 & OPT_FORCE) && isatty(STDIN_FILENO)) {
 124                         bb_error_msg_and_die("compressed data not read from terminal, "
 125                                         "use -f to force it");
 126                 }
 127
 128                 if (!(option_mask32 & SEAMLESS_MAGIC)) {
 129                         init_transformer_state(&xstate);
 130                         /*xstate.signature_skipped = 0; - already is */
 131                         /*xstate.src_fd = STDIN_FILENO; - already is */
 132                         xstate.dst_fd = STDOUT_FILENO;
 133                         status = unpacker(&xstate);
 134                         if (status < 0)
 135                                 exitcode = 1;
 136                 } else {
 137                         if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0)
 138                                 /* Disk full, tty closed, etc. No point in continuing */
 139                                 xfunc_die();
 140                 }
 141
 142                 if (!(option_mask32 & OPT_STDOUT))
 143                         xclose(STDOUT_FILENO); /* with error check! */
 144
 145                 if (filename) {
 146                         char *del = new_name;
 147
 148                         if (status >= 0) {
 149                                 unsigned new_name_len;
 150
 151                                 /* TODO: restore other things? */
 152                                 if (xstate.mtime != 0) {
 153                                         struct timeval times[2];
 154
 155                                         times[1].tv_sec = times[0].tv_sec = xstate.mtime;
 156                                         times[1].tv_usec = times[0].tv_usec = 0;
 157                                         /* Note: we closed it first.
 158                                          * On some systems calling utimes
 159                                          * then closing resets the mtime
 160                                          * back to current time. */
 161                                         utimes(new_name, times); /* ignoring errors */
 162                                 }
 163
 164                                 if (ENABLE_DESKTOP)
 165                                         new_name_len = strlen(new_name);
 166                                 /* Restore source filename (unless tgz -> tar case) */
 167                                 if (new_name == filename) {
 168                                         new_name_len = strlen(filename);
 169                                         filename[new_name_len] = '.';
 170                                 }
 171                                 /* Extreme bloat for gunzip compat */
 172                                 /* Some users do want this info... */
 173                                 if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE)) {
 174                                         unsigned percent = status
 175                                                 ? ((uoff_t)stat_buf.st_size * 100u / (unsigned long long)status)
 176                                                 : 0;
 177                                         fprintf(stderr, "%s: %u%% - replaced with %.*s\n",
 178                                                 filename,
 179                                                 100u - percent,
 180                                                 new_name_len, new_name
 181                                         );
 182                                 }
 183                                 /* Delete _source_ file */
 184                                 del = filename;
 185                         }
 186                         xunlink(del);
 187  free_name:
 188                         if (new_name != filename)
 189                                 free(new_name);
 190                 }
 191         } while (*argv && *++argv);
 192
 193         if (option_mask32 & OPT_STDOUT)
 194                 xclose(STDOUT_FILENO); /* with error check! */
 195
 196         return exitcode;
 197 }
 198
 199 #if ENABLE_UNCOMPRESS \
 200  || ENABLE_FEATURE_BZIP2_DECOMPRESS \
 201  || ENABLE_UNLZMA || ENABLE_LZCAT || ENABLE_LZMA \
 202  || ENABLE_UNXZ || ENABLE_XZCAT || ENABLE_XZ
 203 static
 204 char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
 205 {
 206         char *extension = strrchr(filename, '.');
 207         if (!extension || strcmp(extension + 1, expected_ext) != 0) {
 208                 /* Mimic GNU gunzip - "real" bunzip2 tries to */
 209                 /* unpack file anyway, to file.out */
 210                 return NULL;
 211         }
 212         *extension = '\0';
 213         return filename;
 214 }
 215 #endif
 216
 217
 218 /*
 219  * Uncompress applet for busybox (c) 2002 Glenn McGrath
 220  *
 221  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 222  */
 223 //usage:#define uncompress_trivial_usage
 224 //usage:       "[-cf] [FILE]..."
 225 //usage:#define uncompress_full_usage "\n\n"
 226 //usage:       "Decompress .Z file[s]\n"
 227 //usage:     "\n        -c      Write to stdout"
 228 //usage:     "\n        -f      Overwrite"
 229
 230 //config:config UNCOMPRESS
 231 //config:       bool "uncompress"
 232 //config:       default n  # ancient
 233 //config:       help
 234 //config:         uncompress is used to decompress archives created by compress.
 235 //config:         Not much used anymore, replaced by gzip/gunzip.
 236
 237 //applet:IF_UNCOMPRESS(APPLET(uncompress, BB_DIR_BIN, BB_SUID_DROP))
 238 //kbuild:lib-$(CONFIG_UNCOMPRESS) += bbunzip.o
 239 #if ENABLE_UNCOMPRESS
 240 int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 241 int uncompress_main(int argc UNUSED_PARAM, char **argv)
 242 {
 243         getopt32(argv, "cf");
 244         argv += optind;
 245
 246         return bbunpack(argv, unpack_Z_stream, make_new_name_generic, "Z");
 247 }
 248 #endif
 249
 250
 251 /*
 252  * Gzip implementation for busybox
 253  *
 254  * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
 255  *
 256  * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
 257  * based on gzip sources
 258  *
 259  * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
 260  * well as stdin/stdout, and to generally behave itself wrt command line
 261  * handling.
 262  *
 263  * General cleanup to better adhere to the style guide and make use of standard
 264  * busybox functions by Glenn McGrath
 265  *
 266  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 267  *
 268  * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 269  * Copyright (C) 1992-1993 Jean-loup Gailly
 270  * The unzip code was written and put in the public domain by Mark Adler.
 271  * Portions of the lzw code are derived from the public domain 'compress'
 272  * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
 273  * Ken Turkowski, Dave Mack and Peter Jannesen.
 274  */
 275 //usage:#define gunzip_trivial_usage
 276 //usage:       "[-cft] [FILE]..."
 277 //usage:#define gunzip_full_usage "\n\n"
 278 //usage:       "Decompress FILEs (or stdin)\n"
 279 //usage:     "\n        -c      Write to stdout"
 280 //usage:     "\n        -f      Force"
 281 //usage:     "\n        -t      Test file integrity"
 282 //usage:
 283 //usage:#define gunzip_example_usage
 284 //usage:       "$ ls -la /tmp/BusyBox*\n"
 285 //usage:       "-rw-rw-r--    1 andersen andersen   557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz\n"
 286 //usage:       "$ gunzip /tmp/BusyBox-0.43.tar.gz\n"
 287 //usage:       "$ ls -la /tmp/BusyBox*\n"
 288 //usage:       "-rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
 289 //usage:
 290 //usage:#define zcat_trivial_usage
 291 //usage:       "[FILE]..."
 292 //usage:#define zcat_full_usage "\n\n"
 293 //usage:       "Decompress to stdout"
 294
 295 //config:config GUNZIP
 296 //config:       bool "gunzip"
 297 //config:       default y
 298 //config:       select FEATURE_GZIP_DECOMPRESS
 299 //config:       help
 300 //config:         gunzip is used to decompress archives created by gzip.
 301 //config:         You can use the `-t' option to test the integrity of
 302 //config:         an archive, without decompressing it.
 303 //config:
 304 //config:config ZCAT
 305 //config:       bool "zcat"
 306 //config:       default y
 307 //config:       select FEATURE_GZIP_DECOMPRESS
 308 //config:       help
 309 //config:         Alias to "gunzip -c".
 310 //config:
 311 //config:config FEATURE_GUNZIP_LONG_OPTIONS
 312 //config:       bool "Enable long options"
 313 //config:       default y
 314 //config:       depends on (GUNZIP || ZCAT) && LONG_OPTS
 315
 316 //applet:IF_GUNZIP(APPLET(gunzip, BB_DIR_BIN, BB_SUID_DROP))
 317 //applet:IF_ZCAT(APPLET_ODDNAME(zcat, gunzip, BB_DIR_BIN, BB_SUID_DROP, zcat))
 318 #if ENABLE_FEATURE_GZIP_DECOMPRESS
 319 static
 320 char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
 321 {
 322         char *extension = strrchr(filename, '.');
 323
 324         if (!extension)
 325                 return NULL;
 326
 327         extension++;
 328         if (strcmp(extension, "tgz" + 1) == 0
 329 #if ENABLE_FEATURE_SEAMLESS_Z
 330          || (extension[0] == 'Z' && extension[1] == '\0')
 331 #endif
 332         ) {
 333                 extension[-1] = '\0';
 334         } else if (strcmp(extension, "tgz") == 0) {
 335                 filename = xstrdup(filename);
 336                 extension = strrchr(filename, '.');
 337                 extension[2] = 'a';
 338                 extension[3] = 'r';
 339         } else {
 340                 return NULL;
 341         }
 342         return filename;
 343 }
 344
 345 #if ENABLE_FEATURE_GUNZIP_LONG_OPTIONS
 346 static const char gunzip_longopts[] ALIGN1 =
 347         "stdout\0"              No_argument       "c"
 348         "to-stdout\0"           No_argument       "c"
 349         "force\0"               No_argument       "f"
 350         "test\0"                No_argument       "t"
 351         "no-name\0"             No_argument       "n"
 352         ;
 353 #endif
 354
 355 /*
 356  * Linux kernel build uses gzip -d -n. We accept and ignore it.
 357  * Man page says:
 358  * -n --no-name
 359  * gzip: do not save the original file name and time stamp.
 360  * (The original name is always saved if the name had to be truncated.)
 361  * gunzip: do not restore the original file name/time even if present
 362  * (remove only the gzip suffix from the compressed file name).
 363  * This option is the default when decompressing.
 364  * -N --name
 365  * gzip: always save the original file name and time stamp (this is the default)
 366  * gunzip: restore the original file name and time stamp if present.
 367  */
 368 int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 369 int gunzip_main(int argc UNUSED_PARAM, char **argv)
 370 {
 371 #if ENABLE_FEATURE_GUNZIP_LONG_OPTIONS
 372         applet_long_options = gunzip_longopts;
 373 #endif
 374         getopt32(argv, "cfvqdtn");
 375         argv += optind;
 376
 377         /* If called as zcat...
 378          * Normally, "zcat" is just "gunzip -c".
 379          * But if seamless magic is enabled, then we are much more clever.
 380          */
 381         if (ENABLE_ZCAT && applet_name[1] == 'c')
 382                 option_mask32 |= OPT_STDOUT | SEAMLESS_MAGIC;
 383
 384         return bbunpack(argv, unpack_gz_stream, make_new_name_gunzip, /*unused:*/ NULL);
 385 }
 386 #endif /* FEATURE_GZIP_DECOMPRESS */
 387
 388
 389 /*
 390  * Modified for busybox by Glenn McGrath
 391  * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
 392  *
 393  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 394  */
 395 //usage:#define bunzip2_trivial_usage
 396 //usage:       "[-cf] [FILE]..."
 397 //usage:#define bunzip2_full_usage "\n\n"
 398 //usage:       "Decompress FILEs (or stdin)\n"
 399 //usage:     "\n        -c      Write to stdout"
 400 //usage:     "\n        -f      Force"
 401 //usage:#define bzcat_trivial_usage
 402 //usage:       "[FILE]..."
 403 //usage:#define bzcat_full_usage "\n\n"
 404 //usage:       "Decompress to stdout"
 405
 406 //config:config BUNZIP2
 407 //config:       bool "bunzip2"
 408 //config:       default y
 409 //config:       select FEATURE_BZIP2_DECOMPRESS
 410 //config:       help
 411 //config:         bunzip2 is a compression utility using the Burrows-Wheeler block
 412 //config:         sorting text compression algorithm, and Huffman coding. Compression
 413 //config:         is generally considerably better than that achieved by more
 414 //config:         conventional LZ77/LZ78-based compressors, and approaches the
 415 //config:         performance of the PPM family of statistical compressors.
 416 //config:
 417 //config:         Unless you have a specific application which requires bunzip2, you
 418 //config:         should probably say N here.
 419 //config:
 420 //config:config BZCAT
 421 //config:       bool "bzcat"
 422 //config:       default y
 423 //config:       select FEATURE_BZIP2_DECOMPRESS
 424 //config:       help
 425 //config:         Alias to "bunzip2 -c".
 426
 427 //applet:IF_BUNZIP2(APPLET(bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP))
 428 //applet:IF_BZCAT(APPLET_ODDNAME(bzcat, bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP, bzcat))
 429 #if ENABLE_FEATURE_BZIP2_DECOMPRESS
 430 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 431 int bunzip2_main(int argc UNUSED_PARAM, char **argv)
 432 {
 433         getopt32(argv, "cfvqdt");
 434         argv += optind;
 435         if (ENABLE_BZCAT && applet_name[2] == 'c') /* bzcat */
 436                 option_mask32 |= OPT_STDOUT;
 437
 438         return bbunpack(argv, unpack_bz2_stream, make_new_name_generic, "bz2");
 439 }
 440 #endif
 441
 442
 443 /*
 444  * Small lzma deflate implementation.
 445  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 446  *
 447  * Based on bunzip.c from busybox
 448  *
 449  * Licensed under GPLv2, see file LICENSE in this source tree.
 450  */
 451 //usage:#define unlzma_trivial_usage
 452 //usage:       "[-cf] [FILE]..."
 453 //usage:#define unlzma_full_usage "\n\n"
 454 //usage:       "Decompress FILE (or stdin)\n"
 455 //usage:     "\n        -c      Write to stdout"
 456 //usage:     "\n        -f      Force"
 457 //usage:
 458 //usage:#define lzma_trivial_usage
 459 //usage:       "-d [-cf] [FILE]..."
 460 //usage:#define lzma_full_usage "\n\n"
 461 //usage:       "Decompress FILE (or stdin)\n"
 462 //usage:     "\n        -d      Decompress"
 463 //usage:     "\n        -c      Write to stdout"
 464 //usage:     "\n        -f      Force"
 465 //usage:
 466 //usage:#define lzcat_trivial_usage
 467 //usage:       "[FILE]..."
 468 //usage:#define lzcat_full_usage "\n\n"
 469 //usage:       "Decompress to stdout"
 470 //usage:
 471 //usage:#define unxz_trivial_usage
 472 //usage:       "[-cf] [FILE]..."
 473 //usage:#define unxz_full_usage "\n\n"
 474 //usage:       "Decompress FILE (or stdin)\n"
 475 //usage:     "\n        -c      Write to stdout"
 476 //usage:     "\n        -f      Force"
 477 //usage:
 478 //usage:#define xz_trivial_usage
 479 //usage:       "-d [-cf] [FILE]..."
 480 //usage:#define xz_full_usage "\n\n"
 481 //usage:       "Decompress FILE (or stdin)\n"
 482 //usage:     "\n        -d      Decompress"
 483 //usage:     "\n        -c      Write to stdout"
 484 //usage:     "\n        -f      Force"
 485 //usage:
 486 //usage:#define xzcat_trivial_usage
 487 //usage:       "[FILE]..."
 488 //usage:#define xzcat_full_usage "\n\n"
 489 //usage:       "Decompress to stdout"
 490
 491 //config:config UNLZMA
 492 //config:       bool "unlzma"
 493 //config:       default y
 494 //config:       help
 495 //config:         unlzma is a compression utility using the Lempel-Ziv-Markov chain
 496 //config:         compression algorithm, and range coding. Compression
 497 //config:         is generally considerably better than that achieved by the bzip2
 498 //config:         compressors.
 499 //config:
 500 //config:         The BusyBox unlzma applet is limited to decompression only.
 501 //config:         On an x86 system, this applet adds about 4K.
 502 //config:
 503 //config:config LZCAT
 504 //config:       bool "lzcat"
 505 //config:       default y
 506 //config:       help
 507 //config:         unlzma is a compression utility using the Lempel-Ziv-Markov chain
 508 //config:         compression algorithm, and range coding. Compression
 509 //config:         is generally considerably better than that achieved by the bzip2
 510 //config:         compressors.
 511 //config:
 512 //config:         The BusyBox unlzma applet is limited to decompression only.
 513 //config:         On an x86 system, this applet adds about 4K.
 514 //config:
 515 //config:config LZMA
 516 //config:       bool "lzma -d"
 517 //config:       default y
 518 //config:       help
 519 //config:         Enable this option if you want commands like "lzma -d" to work.
 520 //config:         IOW: you'll get lzma applet, but it will always require -d option.
 521 //config:
 522 //config:config FEATURE_LZMA_FAST
 523 //config:       bool "Optimize for speed"
 524 //config:       default n
 525 //config:       depends on UNLZMA || LZCAT || LZMA
 526 //config:       help
 527 //config:         This option reduces decompression time by about 25% at the cost of
 528 //config:         a 1K bigger binary.
 529
 530 //applet:IF_UNLZMA(APPLET(unlzma, BB_DIR_USR_BIN, BB_SUID_DROP))
 531 //applet:IF_LZCAT(APPLET_ODDNAME(lzcat, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzcat))
 532 //applet:IF_LZMA(APPLET_ODDNAME(lzma, unlzma, BB_DIR_USR_BIN, BB_SUID_DROP, lzma))
 533 //kbuild:lib-$(CONFIG_UNLZMA) += bbunzip.o
 534 //kbuild:lib-$(CONFIG_LZCAT) += bbunzip.o
 535 //kbuild:lib-$(CONFIG_LZMA) += bbunzip.o
 536 #if ENABLE_UNLZMA || ENABLE_LZCAT || ENABLE_LZMA
 537 int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 538 int unlzma_main(int argc UNUSED_PARAM, char **argv)
 539 {
 540         IF_LZMA(int opts =) getopt32(argv, "cfvqdt");
 541 # if ENABLE_LZMA
 542         /* lzma without -d or -t? */
 543         if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
 544                 bb_show_usage();
 545 # endif
 546         /* lzcat? */
 547         if (ENABLE_LZCAT && applet_name[2] == 'c')
 548                 option_mask32 |= OPT_STDOUT;
 549
 550         argv += optind;
 551         return bbunpack(argv, unpack_lzma_stream, make_new_name_generic, "lzma");
 552 }
 553 #endif
 554
 555
 556 //config:config UNXZ
 557 //config:       bool "unxz"
 558 //config:       default y
 559 //config:       help
 560 //config:         unxz is a unlzma successor.
 561 //config:
 562 //config:config XZCAT
 563 //config:       bool "xzcat"
 564 //config:       default y
 565 //config:       help
 566 //config:         Alias to "unxz -c".
 567 //config:
 568 //config:config XZ
 569 //config:       bool "xz -d"
 570 //config:       default y
 571 //config:       help
 572 //config:         Enable this option if you want commands like "xz -d" to work.
 573 //config:         IOW: you'll get xz applet, but it will always require -d option.
 574
 575 //applet:IF_UNXZ(APPLET(unxz, BB_DIR_USR_BIN, BB_SUID_DROP))
 576 //applet:IF_XZCAT(APPLET_ODDNAME(xzcat, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xzcat))
 577 //applet:IF_XZ(APPLET_ODDNAME(xz, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xz))
 578 //kbuild:lib-$(CONFIG_UNXZ) += bbunzip.o
 579 //kbuild:lib-$(CONFIG_XZCAT) += bbunzip.o
 580 //kbuild:lib-$(CONFIG_XZ) += bbunzip.o
 581 #if ENABLE_UNXZ || ENABLE_XZCAT || ENABLE_XZ
 582 int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 583 int unxz_main(int argc UNUSED_PARAM, char **argv)
 584 {
 585         IF_XZ(int opts =) getopt32(argv, "cfvqdt");
 586 # if ENABLE_XZ
 587         /* xz without -d or -t? */
 588         if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
 589                 bb_show_usage();
 590 # endif
 591         /* xzcat? */
 592         if (ENABLE_XZCAT && applet_name[2] == 'c')
 593                 option_mask32 |= OPT_STDOUT;
 594
 595         argv += optind;
 596         return bbunpack(argv, unpack_xz_stream, make_new_name_generic, "xz");
 597 }
 598 #endif