Dogcows Code - chaz/tar/blob - src/tar.c

   1 /* A tar (tape archiver) program.
   2
   3    Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000,
   4    2001, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
   5
   6    Written by John Gilmore, starting 1985-08-25.
   7
   8    This program is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by the
  10    Free Software Foundation; either version 2, or (at your option) any later
  11    version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  16    Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License along
  19    with this program; if not, write to the Free Software Foundation, Inc.,
  20    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #include <system.h>
  23
  24 #include <fnmatch.h>
  25 #include <getline.h>
  26 #include <argp.h>
  27 #include <argp-namefrob.h>
  28 #include <argp-fmtstream.h>
  29
  30 #include <signal.h>
  31 #if ! defined SIGCHLD && defined SIGCLD
  32 # define SIGCHLD SIGCLD
  33 #endif
  34
  35 /* The following causes "common.h" to produce definitions of all the global
  36    variables, rather than just "extern" declarations of them.  GNU tar does
  37    depend on the system loader to preset all GLOBAL variables to neutral (or
  38    zero) values; explicit initialization is usually not done.  */
  39 #define GLOBAL
  40 #include "common.h"
  41
  42 #include <argmatch.h>
  43 #include <closeout.h>
  44 #include <exitfail.h>
  45 #include <getdate.h>
  46 #include <localedir.h>
  47 #include <rmt.h>
  48 #include <prepargs.h>
  49 #include <quotearg.h>
  50 #include <version-etc.h>
  51 #include <xstrtol.h>
  52 #include <stdopen.h>
  53
  54 /* Local declarations.  */
  55
  56 #ifndef DEFAULT_ARCHIVE_FORMAT
  57 # define DEFAULT_ARCHIVE_FORMAT GNU_FORMAT
  58 #endif
  59
  60 #ifndef DEFAULT_ARCHIVE
  61 # define DEFAULT_ARCHIVE "tar.out"
  62 #endif
  63
  64 #ifndef DEFAULT_BLOCKING
  65 # define DEFAULT_BLOCKING 20
  66 #endif
  67
  68 \f
  69 /* Miscellaneous.  */
  70
  71 /* Name of option using stdin.  */
  72 static const char *stdin_used_by;
  73
  74 /* Doesn't return if stdin already requested.  */
  75 void
  76 request_stdin (const char *option)
  77 {
  78   if (stdin_used_by)
  79     USAGE_ERROR ((0, 0, _("Options `-%s' and `-%s' both want standard input"),
  80                   stdin_used_by, option));
  81
  82   stdin_used_by = option;
  83 }
  84
  85 extern int rpmatch (char const *response);
  86
  87 /* Returns true if and only if the user typed an affirmative response.  */
  88 int
  89 confirm (const char *message_action, const char *message_name)
  90 {
  91   static FILE *confirm_file;
  92   static int confirm_file_EOF;
  93   bool status = false;
  94
  95   if (!confirm_file)
  96     {
  97       if (archive == 0 || stdin_used_by)
  98         {
  99           confirm_file = fopen (TTY_NAME, "r");
 100           if (! confirm_file)
 101             open_fatal (TTY_NAME);
 102         }
 103       else
 104         {
 105           request_stdin ("-w");
 106           confirm_file = stdin;
 107         }
 108     }
 109
 110   fprintf (stdlis, "%s %s?", message_action, quote (message_name));
 111   fflush (stdlis);
 112
 113   if (!confirm_file_EOF)
 114     {
 115       char *response = NULL;
 116       size_t response_size = 0;
 117       if (getline (&response, &response_size, confirm_file) < 0)
 118         confirm_file_EOF = 1;
 119       else
 120         status = rpmatch (response) > 0;
 121       free (response);
 122     }
 123
 124   if (confirm_file_EOF)
 125     {
 126       fputc ('\n', stdlis);
 127       fflush (stdlis);
 128     }
 129
 130   return status;
 131 }
 132
 133 static struct fmttab {
 134   char const *name;
 135   enum archive_format fmt;
 136 } const fmttab[] = {
 137   { "v7",      V7_FORMAT },
 138   { "oldgnu",  OLDGNU_FORMAT },
 139   { "ustar",   USTAR_FORMAT },
 140   { "posix",   POSIX_FORMAT },
 141 #if 0 /* not fully supported yet */
 142   { "star",    STAR_FORMAT },
 143 #endif
 144   { "gnu",     GNU_FORMAT },
 145   { "pax",     POSIX_FORMAT }, /* An alias for posix */
 146   { NULL,      0 }
 147 };
 148
 149 static void
 150 set_archive_format (char const *name)
 151 {
 152   struct fmttab const *p;
 153
 154   for (p = fmttab; strcmp (p->name, name) != 0; )
 155     if (! (++p)->name)
 156       USAGE_ERROR ((0, 0, _("%s: Invalid archive format"),
 157                     quotearg_colon (name)));
 158
 159   archive_format = p->fmt;
 160 }
 161
 162 const char *
 163 archive_format_string (enum archive_format fmt)
 164 {
 165   struct fmttab const *p;
 166
 167   for (p = fmttab; p->name; p++)
 168     if (p->fmt == fmt)
 169       return p->name;
 170   return "unknown?";
 171 }
 172
 173 #define FORMAT_MASK(n) (1<<(n))
 174
 175 static void
 176 assert_format(unsigned fmt_mask)
 177 {
 178   if ((FORMAT_MASK (archive_format) & fmt_mask) == 0)
 179     USAGE_ERROR ((0, 0,
 180                   _("GNU features wanted on incompatible archive format")));
 181 }
 182
 183 const char *
 184 subcommand_string (enum subcommand c)
 185 {
 186   switch (c)
 187     {
 188     case UNKNOWN_SUBCOMMAND:
 189       return "unknown?";
 190
 191     case APPEND_SUBCOMMAND:
 192       return "-r";
 193
 194     case CAT_SUBCOMMAND:
 195       return "-A";
 196
 197     case CREATE_SUBCOMMAND:
 198       return "-c";
 199
 200     case DELETE_SUBCOMMAND:
 201       return "-D";
 202
 203     case DIFF_SUBCOMMAND:
 204       return "-d";
 205
 206     case EXTRACT_SUBCOMMAND:
 207       return "-x";
 208
 209     case LIST_SUBCOMMAND:
 210       return "-t";
 211
 212     case UPDATE_SUBCOMMAND:
 213       return "-u";
 214
 215     default:
 216       abort ();
 217     }
 218 }
 219
 220 void
 221 tar_list_quoting_styles (argp_fmtstream_t fs, char *prefix)
 222 {
 223   int i;
 224
 225   for (i = 0; quoting_style_args[i]; i++)
 226     argp_fmtstream_printf (fs, "%s%s\n", prefix, quoting_style_args[i]);
 227 }
 228
 229 void
 230 tar_set_quoting_style (char *arg)
 231 {
 232   int i;
 233
 234   for (i = 0; quoting_style_args[i]; i++)
 235     if (strcmp (arg, quoting_style_args[i]) == 0)
 236       {
 237         set_quoting_style (NULL, i);
 238         return;
 239       }
 240   FATAL_ERROR ((0, 0,
 241                 _("Unknown quoting style `%s'. Try `%s --quoting-style=help' to get a list."), arg, program_invocation_short_name));
 242 }
 243
 244 \f
 245 /* Options.  */
 246
 247 enum
 248 {
 249   ANCHORED_OPTION = CHAR_MAX + 1,
 250   ATIME_PRESERVE_OPTION,
 251   BACKUP_OPTION,
 252   CHECKPOINT_OPTION,
 253   DELAY_DIRECTORY_RESTORE_OPTION,
 254   DELETE_OPTION,
 255   EXCLUDE_CACHES_OPTION,
 256   EXCLUDE_OPTION,
 257   FORCE_LOCAL_OPTION,
 258   GROUP_OPTION,
 259   HANG_OPTION,
 260   IGNORE_CASE_OPTION,
 261   IGNORE_COMMAND_ERROR_OPTION,
 262   IGNORE_FAILED_READ_OPTION,
 263   INDEX_FILE_OPTION,
 264   KEEP_NEWER_FILES_OPTION,
 265   MODE_OPTION,
 266   MTIME_OPTION,
 267   NEWER_MTIME_OPTION,
 268   NO_ANCHORED_OPTION,
 269   NO_DELAY_DIRECTORY_RESTORE_OPTION,
 270   NO_IGNORE_CASE_OPTION,
 271   NO_IGNORE_COMMAND_ERROR_OPTION,
 272   NO_OVERWRITE_DIR_OPTION,
 273   NO_QUOTE_CHARS_OPTION,
 274   NO_RECURSION_OPTION,
 275   NO_SAME_OWNER_OPTION,
 276   NO_SAME_PERMISSIONS_OPTION,
 277   NO_UNQUOTE_OPTION,
 278   NO_WILDCARDS_MATCH_SLASH_OPTION,
 279   NO_WILDCARDS_OPTION,
 280   NULL_OPTION,
 281   NUMERIC_OWNER_OPTION,
 282   OCCURRENCE_OPTION,
 283   OLD_ARCHIVE_OPTION,
 284   ONE_FILE_SYSTEM_OPTION,
 285   OVERWRITE_DIR_OPTION,
 286   OVERWRITE_OPTION,
 287   OWNER_OPTION,
 288   PAX_OPTION,
 289   POSIX_OPTION,
 290   PRESERVE_OPTION,
 291   QUOTE_CHARS_OPTION,
 292   QUOTING_STYLE_OPTION,
 293   RECORD_SIZE_OPTION,
 294   RECURSION_OPTION,
 295   RECURSIVE_UNLINK_OPTION,
 296   REMOVE_FILES_OPTION,
 297   RESTRICT_OPTION,
 298   RMT_COMMAND_OPTION,
 299   RSH_COMMAND_OPTION,
 300   SAME_OWNER_OPTION,
 301   SHOW_DEFAULTS_OPTION,
 302   SHOW_OMITTED_DIRS_OPTION,
 303   SHOW_TRANSFORMED_NAMES_OPTION,
 304   SPARSE_VERSION_OPTION,
 305   STRIP_COMPONENTS_OPTION,
 306   SUFFIX_OPTION,
 307   TEST_LABEL_OPTION,
 308   TOTALS_OPTION,
 309   TO_COMMAND_OPTION,
 310   TRANSFORM_OPTION,
 311   UNQUOTE_OPTION,
 312   USAGE_OPTION,
 313   USE_COMPRESS_PROGRAM_OPTION,
 314   UTC_OPTION,
 315   VERSION_OPTION,
 316   VOLNO_FILE_OPTION,
 317   WILDCARDS_MATCH_SLASH_OPTION,
 318   WILDCARDS_OPTION
 319 };
 320
 321 const char *argp_program_version = "tar (" PACKAGE_NAME ") " VERSION;
 322 const char *argp_program_bug_address = "<" PACKAGE_BUGREPORT ">";
 323 static char const doc[] = N_("\
 324 GNU `tar' saves many files together into a single tape or disk archive, \
 325 and can restore individual files from the archive.\n\
 326 \n\
 327 Examples:\n\
 328   tar -cf archive.tar foo bar  # Create archive.tar from files foo and bar.\n\
 329   tar -tvf archive.tar         # List all files in archive.tar verbosely.\n\
 330   tar -xf archive.tar          # Extract all files from archive.tar.\n")
 331 "\v"
 332 N_("The backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
 333 The version control may be set with --backup or VERSION_CONTROL, values are:\n\n\
 334   none, off       never make backups\n\
 335   t, numbered     make numbered backups\n\
 336   nil, existing   numbered if numbered backups exist, simple otherwise\n\
 337   never, simple   always make simple backups\n");
 338
 339
 340 /* NOTE:
 341
 342    Available option letters are DEIJQY and aeqy. Consider the following
 343    assignments:
 344
 345    [For Solaris tar compatibility =/= Is it important at all?]
 346    e  exit immediately with a nonzero exit status if unexpected errors occur
 347    E  use extended headers (--format=posix)
 348
 349    [q  alias for --occurrence=1 =/= this would better be used for quiet?]
 350    [I  same as T =/= will harm star compatibility]
 351
 352    y  per-file gzip compression
 353    Y  per-block gzip compression */
 354
 355 static struct argp_option options[] = {
 356 #define GRID 10
 357   {NULL, 0, NULL, 0,
 358    N_("Main operation mode:"), GRID },
 359
 360   {"list", 't', 0, 0,
 361    N_("list the contents of an archive"), GRID+1 },
 362   {"extract", 'x', 0, 0,
 363    N_("extract files from an archive"), GRID+1 },
 364   {"get", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 365   {"create", 'c', 0, 0,
 366    N_("create a new archive"), GRID+1 },
 367   {"diff", 'd', 0, 0,
 368    N_("find differences between archive and file system"), GRID+1 },
 369   {"compare", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 370   {"append", 'r', 0, 0,
 371    N_("append files to the end of an archive"), GRID+1 },
 372   {"update", 'u', 0, 0,
 373    N_("only append files newer than copy in archive"), GRID+1 },
 374   {"catenate", 'A', 0, 0,
 375    N_("append tar files to an archive"), GRID+1 },
 376   {"concatenate", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 377   {"delete", DELETE_OPTION, 0, 0,
 378    N_("delete from the archive (not on mag tapes!)"), GRID+1 },
 379   {"test-label", TEST_LABEL_OPTION, NULL, 0,
 380    N_("test the archive volume label and exit"), GRID+1 },
 381 #undef GRID
 382
 383 #define GRID 20
 384   {NULL, 0, NULL, 0,
 385    N_("Operation modifiers:"), GRID },
 386
 387   {"sparse", 'S', 0, 0,
 388    N_("handle sparse files efficiently"), GRID+1 },
 389   {"sparse-version", SPARSE_VERSION_OPTION, N_("MAJOR[.MINOR]"), 0,
 390    N_("set version of the sparse format to use (implies --sparse)"), GRID+1},
 391   {"incremental", 'G', 0, 0,
 392    N_("handle old GNU-format incremental backup"), GRID+1 },
 393   {"listed-incremental", 'g', N_("FILE"), 0,
 394    N_("handle new GNU-format incremental backup"), GRID+1 },
 395   {"ignore-failed-read", IGNORE_FAILED_READ_OPTION, 0, 0,
 396    N_("do not exit with nonzero on unreadable files"), GRID+1 },
 397   {"occurrence", OCCURRENCE_OPTION, N_("NUMBER"), OPTION_ARG_OPTIONAL,
 398    N_("process only the NUMBERth occurrence of each file in the archive;"
 399       " this option is valid only in conjunction with one of the subcommands"
 400       " --delete, --diff, --extract or --list and when a list of files"
 401       " is given either on the command line or via the -T option;"
 402       " NUMBER defaults to 1"), GRID+1 },
 403   {"seek", 'n', NULL, 0,
 404    N_("archive is seekable"), GRID+1 },
 405 #undef GRID
 406
 407 #define GRID 30
 408   {NULL, 0, NULL, 0,
 409    N_("Overwrite control:"), GRID },
 410
 411   {"verify", 'W', 0, 0,
 412    N_("attempt to verify the archive after writing it"), GRID+1 },
 413   {"remove-files", REMOVE_FILES_OPTION, 0, 0,
 414    N_("remove files after adding them to the archive"), GRID+1 },
 415   {"keep-old-files", 'k', 0, 0,
 416    N_("don't replace existing files when extracting"), GRID+1 },
 417   {"keep-newer-files", KEEP_NEWER_FILES_OPTION, 0, 0,
 418    N_("don't replace existing files that are newer than their archive copies"), GRID+1 },
 419   {"overwrite", OVERWRITE_OPTION, 0, 0,
 420    N_("overwrite existing files when extracting"), GRID+1 },
 421   {"unlink-first", 'U', 0, 0,
 422    N_("remove each file prior to extracting over it"), GRID+1 },
 423   {"recursive-unlink", RECURSIVE_UNLINK_OPTION, 0, 0,
 424    N_("empty hierarchies prior to extracting directory"), GRID+1 },
 425   {"no-overwrite-dir", NO_OVERWRITE_DIR_OPTION, 0, 0,
 426    N_("preserve metadata of existing directories"), GRID+1 },
 427   {"overwrite-dir", OVERWRITE_DIR_OPTION, 0, 0,
 428    N_("overwrite metadata of existing directories when extracting (default)"),
 429    GRID+1 },
 430 #undef GRID
 431
 432 #define GRID 40
 433   {NULL, 0, NULL, 0,
 434    N_("Select output stream:"), GRID },
 435
 436   {"to-stdout", 'O', 0, 0,
 437    N_("extract files to standard output"), GRID+1 },
 438   {"to-command", TO_COMMAND_OPTION, N_("COMMAND"), 0,
 439    N_("pipe extracted files to another program"), GRID+1 },
 440   {"ignore-command-error", IGNORE_COMMAND_ERROR_OPTION, 0, 0,
 441    N_("ignore exit codes of children"), GRID+1 },
 442   {"no-ignore-command-error", NO_IGNORE_COMMAND_ERROR_OPTION, 0, 0,
 443    N_("treat non-zero exit codes of children as error"), GRID+1 },
 444 #undef GRID
 445
 446 #define GRID 50
 447   {NULL, 0, NULL, 0,
 448    N_("Handling of file attributes:"), GRID },
 449
 450   {"owner", OWNER_OPTION, N_("NAME"), 0,
 451    N_("force NAME as owner for added files"), GRID+1 },
 452   {"group", GROUP_OPTION, N_("NAME"), 0,
 453    N_("force NAME as group for added files"), GRID+1 },
 454   {"mtime", MTIME_OPTION, N_("DATE-OR-FILE"), 0,
 455    N_("set mtime for added files from DATE-OR-FILE"), GRID+1 },
 456   {"mode", MODE_OPTION, N_("CHANGES"), 0,
 457    N_("force (symbolic) mode CHANGES for added files"), GRID+1 },
 458   {"atime-preserve", ATIME_PRESERVE_OPTION,
 459    N_("METHOD"), OPTION_ARG_OPTIONAL,
 460    N_("preserve access times on dumped files, either by restoring the times"
 461       " after reading (METHOD='replace'; default) or by not setting the times"
 462       " in the first place (METHOD='system')"), GRID+1 },
 463   {"touch", 'm', 0, 0,
 464    N_("don't extract file modified time"), GRID+1 },
 465   {"same-owner", SAME_OWNER_OPTION, 0, 0,
 466    N_("try extracting files with the same ownership"), GRID+1 },
 467   {"no-same-owner", NO_SAME_OWNER_OPTION, 0, 0,
 468    N_("extract files as yourself"), GRID+1 },
 469   {"numeric-owner", NUMERIC_OWNER_OPTION, 0, 0,
 470    N_("always use numbers for user/group names"), GRID+1 },
 471   {"preserve-permissions", 'p', 0, 0,
 472    N_("extract information about file permissions (default for superuser)"),
 473    GRID+1 },
 474   {"same-permissions", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 475   {"no-same-permissions", NO_SAME_PERMISSIONS_OPTION, 0, 0,
 476    N_("apply the user's umask when extracting permissions from the archive (default for ordinary users)"), GRID+1 },
 477   {"preserve-order", 's', 0, 0,
 478    N_("sort names to extract to match archive"), GRID+1 },
 479   {"same-order", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 480   {"preserve", PRESERVE_OPTION, 0, 0,
 481    N_("same as both -p and -s"), GRID+1 },
 482   {"delay-directory-restore", DELAY_DIRECTORY_RESTORE_OPTION, 0, 0,
 483    N_("delay setting modification times and permissions of extracted"
 484       " directories until the end of extraction"), GRID+1 },
 485   {"no-delay-directory-restore", NO_DELAY_DIRECTORY_RESTORE_OPTION, 0, 0,
 486    N_("cancel the effect of --delay-directory-restore option"), GRID+1 },
 487 #undef GRID
 488
 489 #define GRID 60
 490   {NULL, 0, NULL, 0,
 491    N_("Device selection and switching:"), GRID },
 492
 493   {"file", 'f', N_("ARCHIVE"), 0,
 494    N_("use archive file or device ARCHIVE"), GRID+1 },
 495   {"force-local", FORCE_LOCAL_OPTION, 0, 0,
 496    N_("archive file is local even if it has a colon"), GRID+1 },
 497   {"rmt-command", RMT_COMMAND_OPTION, N_("COMMAND"), 0,
 498    N_("use given rmt COMMAND instead of rmt"), GRID+1 },
 499   {"rsh-command", RSH_COMMAND_OPTION, N_("COMMAND"), 0,
 500    N_("use remote COMMAND instead of rsh"), GRID+1 },
 501 #ifdef DEVICE_PREFIX
 502   {"-[0-7][lmh]", 0, NULL, OPTION_DOC, /* It is OK, since `name' will never be
 503                                           translated */
 504    N_("specify drive and density"), GRID+1 },
 505 #endif
 506   {NULL, '0', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 507   {NULL, '1', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 508   {NULL, '2', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 509   {NULL, '3', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 510   {NULL, '4', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 511   {NULL, '5', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 512   {NULL, '6', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 513   {NULL, '7', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 514   {NULL, '8', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 515   {NULL, '9', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 516
 517   {"multi-volume", 'M', 0, 0,
 518    N_("create/list/extract multi-volume archive"), GRID+1 },
 519   {"tape-length", 'L', N_("NUMBER"), 0,
 520    N_("change tape after writing NUMBER x 1024 bytes"), GRID+1 },
 521   {"info-script", 'F', N_("NAME"), 0,
 522    N_("run script at end of each tape (implies -M)"), GRID+1 },
 523   {"new-volume-script", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 524   {"volno-file", VOLNO_FILE_OPTION, N_("FILE"), 0,
 525    N_("use/update the volume number in FILE"), GRID+1 },
 526 #undef GRID
 527
 528 #define GRID 70
 529   {NULL, 0, NULL, 0,
 530    N_("Device blocking:"), GRID },
 531
 532   {"blocking-factor", 'b', N_("BLOCKS"), 0,
 533    N_("BLOCKS x 512 bytes per record"), GRID+1 },
 534   {"record-size", RECORD_SIZE_OPTION, N_("NUMBER"), 0,
 535    N_("NUMBER of bytes per record, multiple of 512"), GRID+1 },
 536   {"ignore-zeros", 'i', 0, 0,
 537    N_("ignore zeroed blocks in archive (means EOF)"), GRID+1 },
 538   {"read-full-records", 'B', 0, 0,
 539    N_("reblock as we read (for 4.2BSD pipes)"), GRID+1 },
 540 #undef GRID
 541
 542 #define GRID 80
 543   {NULL, 0, NULL, 0,
 544    N_("Archive format selection:"), GRID },
 545
 546   {"format", 'H', N_("FORMAT"), 0,
 547    N_("create archive of the given format"), GRID+1 },
 548
 549   {NULL, 0, NULL, 0, N_("FORMAT is one of the following:"), GRID+2 },
 550   {"  v7", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("old V7 tar format"),
 551    GRID+3 },
 552   {"  oldgnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 553    N_("GNU format as per tar <= 1.12"), GRID+3 },
 554   {"  gnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 555    N_("GNU tar 1.13.x format"), GRID+3 },
 556   {"  ustar", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 557    N_("POSIX 1003.1-1988 (ustar) format"), GRID+3 },
 558   {"  pax", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 559    N_("POSIX 1003.1-2001 (pax) format"), GRID+3 },
 560   {"  posix", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("same as pax"), GRID+3 },
 561
 562   {"old-archive", OLD_ARCHIVE_OPTION, 0, 0, /* FIXME */
 563    N_("same as --format=v7"), GRID+8 },
 564   {"portability", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 565   {"posix", POSIX_OPTION, 0, 0,
 566    N_("same as --format=posix"), GRID+8 },
 567   {"pax-option", PAX_OPTION, N_("keyword[[:]=value][,keyword[[:]=value]]..."), 0,
 568    N_("control pax keywords"), GRID+8 },
 569   {"label", 'V', N_("TEXT"), 0,
 570    N_("create archive with volume name TEXT; at list/extract time, use TEXT as a globbing pattern for volume name"), GRID+8 },
 571   {"bzip2", 'j', 0, 0,
 572    N_("filter the archive through bzip2"), GRID+8 },
 573   {"gzip", 'z', 0, 0,
 574    N_("filter the archive through gzip"), GRID+8 },
 575   {"gunzip", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 576   {"ungzip", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 577   {"compress", 'Z', 0, 0,
 578    N_("filter the archive through compress"), GRID+8 },
 579   {"uncompress", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 580   {"use-compress-program", USE_COMPRESS_PROGRAM_OPTION, N_("PROG"), 0,
 581    N_("filter through PROG (must accept -d)"), GRID+8 },
 582 #undef GRID
 583
 584 #define GRID 90
 585   {NULL, 0, NULL, 0,
 586    N_("Local file selection:"), GRID },
 587
 588   {"add-file", ARGP_KEY_ARG, N_("FILE"), 0,
 589    N_("add given FILE to the archive (useful if its name starts with a dash)"), GRID+1 },
 590   {"directory", 'C', N_("DIR"), 0,
 591    N_("change to directory DIR"), GRID+1 },
 592   {"files-from", 'T', N_("FILE"), 0,
 593    N_("get names to extract or create from FILE"), GRID+1 },
 594   {"null", NULL_OPTION, 0, 0,
 595    N_("-T reads null-terminated names, disable -C"), GRID+1 },
 596   {"unquote", UNQUOTE_OPTION, 0, 0,
 597    N_("unquote filenames read with -T (default)"), GRID+1 },
 598   {"no-unquote", NO_UNQUOTE_OPTION, 0, 0,
 599    N_("do not unquote filenames read with -T"), GRID+1 },
 600   {"exclude", EXCLUDE_OPTION, N_("PATTERN"), 0,
 601    N_("exclude files, given as a PATTERN"), GRID+1 },
 602   {"exclude-from", 'X', N_("FILE"), 0,
 603    N_("exclude patterns listed in FILE"), GRID+1 },
 604   {"exclude-caches", EXCLUDE_CACHES_OPTION, 0, 0,
 605    N_("exclude directories containing a cache tag"), GRID+1 },
 606   {"no-recursion", NO_RECURSION_OPTION, 0, 0,
 607    N_("avoid descending automatically in directories"), GRID+1 },
 608   {"one-file-system", ONE_FILE_SYSTEM_OPTION, 0, 0,
 609    N_("stay in local file system when creating archive"), GRID+1 },
 610   {"recursion", RECURSION_OPTION, 0, 0,
 611    N_("recurse into directories (default)"), GRID+1 },
 612   {"absolute-names", 'P', 0, 0,
 613    N_("don't strip leading `/'s from file names"), GRID+1 },
 614   {"dereference", 'h', 0, 0,
 615    N_("follow symlinks; archive and dump the files they point to"), GRID+1 },
 616   {"starting-file", 'K', N_("MEMBER-NAME"), 0,
 617    N_("begin at member MEMBER-NAME in the archive"), GRID+1 },
 618   {"newer", 'N', N_("DATE-OR-FILE"), 0,
 619    N_("only store files newer than DATE-OR-FILE"), GRID+1 },
 620   {"after-date", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 621   {"newer-mtime", NEWER_MTIME_OPTION, N_("DATE"), 0,
 622    N_("compare date and time when data changed only"), GRID+1 },
 623   {"backup", BACKUP_OPTION, N_("CONTROL"), OPTION_ARG_OPTIONAL,
 624    N_("backup before removal, choose version CONTROL"), GRID+1 },
 625   {"suffix", SUFFIX_OPTION, N_("STRING"), 0,
 626    N_("backup before removal, override usual suffix ('~' unless overridden by environment variable SIMPLE_BACKUP_SUFFIX)"), GRID+1 },
 627 #undef GRID
 628
 629 #define GRID 92
 630   {NULL, 0, NULL, 0,
 631    N_("File name transformations:"), GRID },
 632   {"strip-components", STRIP_COMPONENTS_OPTION, N_("NUMBER"), 0,
 633    N_("strip NUMBER leading components from file names on extraction"),
 634    GRID+1 },
 635   {"transform", TRANSFORM_OPTION, N_("EXPRESSION"), 0,
 636    N_("use sed replace EXPRESSION to transform file names"), GRID+1 },
 637 #undef GRID
 638
 639 #define GRID 95
 640   {NULL, 0, NULL, 0,
 641    N_("File name matching options (affect both exclude and include patterns):"),
 642    GRID },
 643   {"ignore-case", IGNORE_CASE_OPTION, 0, 0,
 644    N_("ignore case"), GRID+1 },
 645   {"anchored", ANCHORED_OPTION, 0, 0,
 646    N_("patterns match file name start"), GRID+1 },
 647   {"no-anchored", NO_ANCHORED_OPTION, 0, 0,
 648    N_("patterns match after any `/' (default for exclusion)"), GRID+1 },
 649   {"no-ignore-case", NO_IGNORE_CASE_OPTION, 0, 0,
 650    N_("case sensitive matching (default)"), GRID+1 },
 651   {"wildcards", WILDCARDS_OPTION, 0, 0,
 652    N_("use wildcards (default for exclusion)"), GRID+1 },
 653   {"no-wildcards", NO_WILDCARDS_OPTION, 0, 0,
 654    N_("verbatim string matching"), GRID+1 },
 655   {"no-wildcards-match-slash", NO_WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
 656    N_("wildcards do not match `/'"), GRID+1 },
 657   {"wildcards-match-slash", WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
 658    N_("wildcards match `/' (default for exclusion)"), GRID+1 },
 659 #undef GRID
 660
 661 #define GRID 100
 662   {NULL, 0, NULL, 0,
 663    N_("Informative output:"), GRID },
 664
 665   {"verbose", 'v', 0, 0,
 666    N_("verbosely list files processed"), GRID+1 },
 667   {"checkpoint", CHECKPOINT_OPTION, N_("[.]NUMBER"), OPTION_ARG_OPTIONAL,
 668    N_("display progress messages every NUMBERth record (default 10)"),
 669    GRID+1 },
 670   {"check-links", 'l', 0, 0,
 671    N_("print a message if not all links are dumped"), GRID+1 },
 672   {"totals", TOTALS_OPTION, N_("SIGNAL"), OPTION_ARG_OPTIONAL,
 673    N_("print total bytes after processing the archive; "
 674       "with an argument - print total bytes when this SIGNAL is delivered; "
 675       "Allowed signals are: SIGHUP, SIGQUIT, SIGINT, SIGUSR1 and SIGUSR2; "
 676       "the names without SIG prefix are also accepted"), GRID+1 },
 677   {"utc", UTC_OPTION, 0, 0,
 678    N_("print file modification dates in UTC"), GRID+1 },
 679   {"index-file", INDEX_FILE_OPTION, N_("FILE"), 0,
 680    N_("send verbose output to FILE"), GRID+1 },
 681   {"block-number", 'R', 0, 0,
 682    N_("show block number within archive with each message"), GRID+1 },
 683   {"interactive", 'w', 0, 0,
 684    N_("ask for confirmation for every action"), GRID+1 },
 685   {"confirmation", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 686   {"show-defaults", SHOW_DEFAULTS_OPTION, 0, 0,
 687    N_("show tar defaults"), GRID+1 },
 688   {"show-omitted-dirs", SHOW_OMITTED_DIRS_OPTION, 0, 0,
 689    N_("when listing or extracting, list each directory that does not match search criteria"), GRID+1 },
 690   {"show-transformed-names", SHOW_TRANSFORMED_NAMES_OPTION, 0, 0,
 691    N_("show file or archive names after transformation"),
 692    GRID+1 },
 693   {"show-stored-names", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 694   {"quoting-style", QUOTING_STYLE_OPTION, N_("STYLE"), 0,
 695    N_("set name quoting style; see below for valid STYLE values"), GRID+1 },
 696   {"quote-chars", QUOTE_CHARS_OPTION, N_("STRING"), 0,
 697    N_("additionally quote characters from STRING"), GRID+1 },
 698   {"no-quote-chars", NO_QUOTE_CHARS_OPTION, N_("STRING"), 0,
 699    N_("disable quoting for characters from STRING"), GRID+1 },
 700 #undef GRID
 701
 702 #define GRID 110
 703   {NULL, 0, NULL, 0,
 704    N_("Compatibility options:"), GRID },
 705
 706   {NULL, 'o', 0, 0,
 707    N_("when creating, same as --old-archive; when extracting, same as --no-same-owner"), GRID+1 },
 708 #undef GRID
 709
 710 #define GRID 120
 711   {NULL, 0, NULL, 0,
 712    N_("Other options:"), GRID },
 713
 714   {"restrict", RESTRICT_OPTION, 0, 0,
 715    N_("disable use of some potentially harmful options"), -1 },
 716
 717   {"help",  '?', 0, 0,  N_("give this help list"), -1},
 718   {"usage", USAGE_OPTION, 0, 0,  N_("give a short usage message"), -1},
 719   {"version", VERSION_OPTION, 0, 0,  N_("print program version"), -1},
 720   /* FIXME -V (--label) conflicts with the default short option for
 721      --version */
 722   {"HANG",        HANG_OPTION,    "SECS", OPTION_ARG_OPTIONAL | OPTION_HIDDEN,
 723    N_("hang for SECS seconds (default 3600)"), 0},
 724 #undef GRID
 725
 726   {0, 0, 0, 0, 0, 0}
 727 };
 728
 729 static char const *const atime_preserve_args[] =
 730 {
 731   "replace", "system", NULL
 732 };
 733
 734 static enum atime_preserve const atime_preserve_types[] =
 735 {
 736   replace_atime_preserve, system_atime_preserve
 737 };
 738
 739 /* Make sure atime_preserve_types has as much entries as atime_preserve_args
 740    (minus 1 for NULL guard) */
 741 ARGMATCH_VERIFY (atime_preserve_args, atime_preserve_types);
 742
 743 /* Wildcard matching settings */
 744 enum wildcards
 745   {
 746     default_wildcards, /* For exclusion == enable_wildcards,
 747                           for inclusion == disable_wildcards */
 748     disable_wildcards,
 749     enable_wildcards
 750   };
 751
 752 struct tar_args        /* Variables used during option parsing */
 753 {
 754   struct textual_date *textual_date; /* Keeps the arguments to --newer-mtime
 755                                         and/or --date option if they are
 756                                         textual dates */
 757   enum wildcards wildcards;        /* Wildcard settings (--wildcards/
 758                                       --no-wildcards) */
 759   int matching_flags;              /* exclude_fnmatch options */
 760   int include_anchored;            /* Pattern anchoring options used for
 761                                       file inclusion */
 762   bool o_option;                   /* True if -o option was given */
 763   bool pax_option;                 /* True if --pax-option was given */
 764   char const *backup_suffix_string;   /* --suffix option argument */
 765   char const *version_control_string; /* --backup option argument */
 766   bool input_files;                /* True if some input files where given */
 767 };
 768
 769 #define MAKE_EXCL_OPTIONS(args) \
 770  ((((args)->wildcards != disable_wildcards) ? EXCLUDE_WILDCARDS : 0) \
 771   | (args)->matching_flags \
 772   | recursion_option)
 773
 774 #define MAKE_INCL_OPTIONS(args) \
 775  ((((args)->wildcards == enable_wildcards) ? EXCLUDE_WILDCARDS : 0) \
 776   | (args)->include_anchored \
 777   | (args)->matching_flags \
 778   | recursion_option)
 779
 780 #ifdef REMOTE_SHELL
 781 # define DECL_SHOW_DEFAULT_SETTINGS(stream, printer)                      \
 782 {                                                                         \
 783   printer (stream,                                                        \
 784            "--format=%s -f%s -b%d --quoting-style=%s --rmt-command=%s",   \
 785            archive_format_string (DEFAULT_ARCHIVE_FORMAT),                \
 786            DEFAULT_ARCHIVE, DEFAULT_BLOCKING,                             \
 787            quoting_style_args[DEFAULT_QUOTING_STYLE],                     \
 788            DEFAULT_RMT_COMMAND);                                          \
 789   printer (stream, " --rsh-command=%s", REMOTE_SHELL);                    \
 790   printer (stream, "\n");                                                 \
 791 }
 792 #else
 793 # define DECL_SHOW_DEFAULT_SETTINGS(stream, printer)                      \
 794 {                                                                         \
 795   printer (stream,                                                        \
 796            "--format=%s -f%s -b%d --quoting-style=%s --rmt-command=%s",   \
 797            archive_format_string (DEFAULT_ARCHIVE_FORMAT),                \
 798            DEFAULT_ARCHIVE, DEFAULT_BLOCKING,                             \
 799            quoting_style_args[DEFAULT_QUOTING_STYLE],                     \
 800            DEFAULT_RMT_COMMAND);                                          \
 801   printer (stream, "\n");                                                 \
 802 }
 803 #endif
 804
 805 static void
 806 show_default_settings (FILE *fp)
 807      DECL_SHOW_DEFAULT_SETTINGS(fp, fprintf)
 808
 809 static void
 810 show_default_settings_fs (argp_fmtstream_t fs)
 811      DECL_SHOW_DEFAULT_SETTINGS(fs, argp_fmtstream_printf)
 812
 813 static void
 814 set_subcommand_option (enum subcommand subcommand)
 815 {
 816   if (subcommand_option != UNKNOWN_SUBCOMMAND
 817       && subcommand_option != subcommand)
 818     USAGE_ERROR ((0, 0,
 819                   _("You may not specify more than one `-Acdtrux' option")));
 820
 821   subcommand_option = subcommand;
 822 }
 823
 824 static void
 825 set_use_compress_program_option (const char *string)
 826 {
 827   if (use_compress_program_option
 828       && strcmp (use_compress_program_option, string) != 0)
 829     USAGE_ERROR ((0, 0, _("Conflicting compression options")));
 830
 831   use_compress_program_option = string;
 832 }
 833 \f
 834 static RETSIGTYPE
 835 sigstat (int signo)
 836 {
 837   compute_duration ();
 838   print_total_stats ();
 839 #ifndef HAVE_SIGACTION
 840   signal (signo, sigstat);
 841 #endif
 842 }
 843
 844 static void
 845 stat_on_signal (int signo)
 846 {
 847 #ifdef HAVE_SIGACTION
 848   struct sigaction act;
 849   act.sa_handler = sigstat;
 850   sigemptyset (&act.sa_mask);
 851   act.sa_flags = 0;
 852   sigaction (signo, &act, NULL);
 853 #else
 854   signal (signo, sigstat);
 855 #endif
 856 }
 857
 858 void
 859 set_stat_signal (const char *name)
 860 {
 861   static struct sigtab
 862   {
 863     char *name;
 864     int signo;
 865   } sigtab[] = {
 866     { "SIGUSR1", SIGUSR1 },
 867     { "USR1", SIGUSR1 },
 868     { "SIGUSR2", SIGUSR2 },
 869     { "USR2", SIGUSR2 },
 870     { "SIGHUP", SIGHUP },
 871     { "HUP", SIGHUP },
 872     { "SIGINT", SIGINT },
 873     { "INT", SIGINT },
 874     { "SIGQUIT", SIGQUIT },
 875     { "QUIT", SIGQUIT }
 876   };
 877   struct sigtab *p;
 878
 879   for (p = sigtab; p < sigtab + sizeof (sigtab) / sizeof (sigtab[0]); p++)
 880     if (strcmp (p->name, name) == 0)
 881       {
 882         stat_on_signal (p->signo);
 883         return;
 884       }
 885   FATAL_ERROR ((0, 0, _("Unknown signal name: %s"), name));
 886 }
 887
 888 \f
 889 struct textual_date
 890 {
 891   struct textual_date *next;
 892   struct timespec *ts;
 893   const char *option;
 894   const char *date;
 895 };
 896
 897 static void
 898 get_date_or_file (struct tar_args *args, const char *option,
 899                   const char *str, struct timespec *ts)
 900 {
 901   if (FILE_SYSTEM_PREFIX_LEN (str) != 0
 902       || ISSLASH (*str)
 903       || *str == '.')
 904     {
 905       struct stat st;
 906       if (deref_stat (dereference_option, str, &st) != 0)
 907         {
 908           stat_error (str);
 909           USAGE_ERROR ((0, 0, _("Date sample file not found")));
 910         }
 911       *ts = get_stat_mtime (&st);
 912     }
 913   else
 914     {
 915       if (! get_date (ts, str, NULL))
 916         {
 917           WARN ((0, 0, _("Substituting %s for unknown date format %s"),
 918                  tartime (*ts, false), quote (str)));
 919           ts->tv_nsec = 0;
 920         }
 921       else
 922         {
 923           struct textual_date *p = xmalloc (sizeof (*p));
 924           p->ts = ts;
 925           p->option = option;
 926           p->date = str;
 927           p->next = args->textual_date;
 928           args->textual_date = p;
 929         }
 930     }
 931 }
 932
 933 static void
 934 report_textual_dates (struct tar_args *args)
 935 {
 936   struct textual_date *p;
 937   for (p = args->textual_date; p; )
 938     {
 939       struct textual_date *next = p->next;
 940       char const *treated_as = tartime (*p->ts, true);
 941       if (strcmp (p->date, treated_as) != 0)
 942         WARN ((0, 0, _("Option %s: Treating date `%s' as %s"),
 943                p->option, p->date, treated_as));
 944       free (p);
 945       p = next;
 946     }
 947 }
 948
 949 \f
 950 static volatile int _argp_hang;
 951
 952 enum read_file_list_state  /* Result of reading file name from the list file */
 953   {
 954     file_list_success,     /* OK, name read successfully */
 955     file_list_end,         /* End of list file */
 956     file_list_zero         /* Zero separator encountered where it should not */
 957   };
 958
 959 /* Read from FP a sequence of characters up to FILENAME_TERMINATOR and put them
 960    into STK.
 961  */
 962 static enum read_file_list_state
 963 read_name_from_file (FILE *fp, struct obstack *stk)
 964 {
 965   int c;
 966   size_t counter = 0;
 967
 968   for (c = getc (fp); c != EOF && c != filename_terminator; c = getc (fp))
 969     {
 970       if (c == 0)
 971         {
 972           /* We have read a zero separator. The file possibly is
 973              zero-separated */
 974           /* FATAL_ERROR((0, 0, N_("file name contains null character"))); */
 975           return file_list_zero;
 976         }
 977       obstack_1grow (stk, c);
 978       counter++;
 979     }
 980
 981   obstack_1grow (stk, 0);
 982
 983   return (counter == 0 && c == EOF) ? file_list_end : file_list_success;
 984 }
 985
 986 \f
 987 static bool files_from_option;  /* When set, tar will not refuse to create
 988                                    empty archives */
 989 static struct obstack argv_stk; /* Storage for additional command line options
 990                                    read using -T option */
 991
 992 /* Prevent recursive inclusion of the same file */
 993 struct file_id_list
 994 {
 995   struct file_id_list *next;
 996   ino_t ino;
 997   dev_t dev;
 998 };
 999
1000 static struct file_id_list *file_id_list;
1001
1002 static void
1003 add_file_id (const char *filename)
1004 {
1005   struct file_id_list *p;
1006   struct stat st;
1007
1008   if (stat (filename, &st))
1009     stat_fatal (filename);
1010   for (p = file_id_list; p; p = p->next)
1011     if (p->ino == st.st_ino && p->dev == st.st_dev)
1012       {
1013         FATAL_ERROR ((0, 0, _("%s: file list already read"),
1014                       quotearg_colon (filename)));
1015       }
1016   p = xmalloc (sizeof *p);
1017   p->next = file_id_list;
1018   p->ino = st.st_ino;
1019   p->dev = st.st_dev;
1020   file_id_list = p;
1021 }
1022
1023 /* Default density numbers for [0-9][lmh] device specifications */
1024
1025 #ifndef LOW_DENSITY_NUM
1026 # define LOW_DENSITY_NUM 0
1027 #endif
1028
1029 #ifndef MID_DENSITY_NUM
1030 # define MID_DENSITY_NUM 8
1031 #endif
1032
1033 #ifndef HIGH_DENSITY_NUM
1034 # define HIGH_DENSITY_NUM 16
1035 #endif
1036
1037 static void
1038 update_argv (const char *filename, struct argp_state *state)
1039 {
1040   FILE *fp;
1041   size_t count = 0, i;
1042   char *start, *p;
1043   char **new_argv;
1044   size_t new_argc;
1045   bool is_stdin = false;
1046   enum read_file_list_state read_state;
1047
1048   if (!strcmp (filename, "-"))
1049     {
1050       is_stdin = true;
1051       request_stdin ("-T");
1052       fp = stdin;
1053     }
1054   else
1055     {
1056       add_file_id (filename);
1057       if ((fp = fopen (filename, "r")) == NULL)
1058         open_fatal (filename);
1059     }
1060
1061   while ((read_state = read_name_from_file (fp, &argv_stk)) == file_list_success)
1062     count++;
1063
1064   if (read_state == file_list_zero)
1065     {
1066       size_t size;
1067
1068       WARN ((0, 0, N_("%s: file name read contains nul character"),
1069              quotearg_colon (filename)));
1070
1071       /* Prepare new stack contents */
1072       size = obstack_object_size (&argv_stk);
1073       p = obstack_finish (&argv_stk);
1074       for (; size > 0; size--, p++)
1075         if (*p)
1076           obstack_1grow (&argv_stk, *p);
1077         else
1078           obstack_1grow (&argv_stk, '\n');
1079       obstack_1grow (&argv_stk, 0);
1080       count = 1;
1081
1082       /* Read rest of files using new filename terminator */
1083       filename_terminator = 0;
1084       while (read_name_from_file (fp, &argv_stk) == file_list_success)
1085         count++;
1086     }
1087
1088   if (!is_stdin)
1089     fclose (fp);
1090
1091   if (count == 0)
1092     return;
1093
1094   start = obstack_finish (&argv_stk);
1095
1096   if (filename_terminator == 0)
1097     for (p = start; *p; p += strlen (p) + 1)
1098       if (p[0] == '-')
1099         count++;
1100
1101   new_argc = state->argc + count;
1102   new_argv = xmalloc (sizeof (state->argv[0]) * (new_argc + 1));
1103   memcpy (new_argv, state->argv, sizeof (state->argv[0]) * (state->argc + 1));
1104   state->argv = new_argv;
1105   memmove (&state->argv[state->next + count], &state->argv[state->next],
1106            (state->argc - state->next + 1) * sizeof (state->argv[0]));
1107
1108   state->argc = new_argc;
1109
1110   for (i = state->next, p = start; *p; p += strlen (p) + 1, i++)
1111     {
1112       if (filename_terminator == 0 && p[0] == '-')
1113         state->argv[i++] = "--add-file";
1114       state->argv[i] = p;
1115     }
1116 }
1117
1118 \f
1119 static void
1120 tar_help (struct argp_state *state)
1121 {
1122   argp_fmtstream_t fs;
1123   state->flags |= ARGP_NO_EXIT;
1124   argp_state_help (state, state->out_stream,
1125                    ARGP_HELP_STD_HELP & ~ARGP_HELP_BUG_ADDR);
1126   /* FIXME: use struct uparams.rmargin (from argp-help.c) instead of 79 */
1127   fs = argp_make_fmtstream (state->out_stream, 0, 79, 0);
1128
1129   argp_fmtstream_printf (fs, "\n%s\n\n",
1130                        _("Valid arguments for --quoting-style options are:"));
1131   tar_list_quoting_styles (fs, "  ");
1132
1133   argp_fmtstream_puts (fs, _("\n*This* tar defaults to:\n"));
1134   show_default_settings_fs (fs);
1135   argp_fmtstream_putc (fs, '\n');
1136   argp_fmtstream_printf (fs, _("Report bugs to %s.\n"),
1137                          argp_program_bug_address);
1138   argp_fmtstream_free (fs);
1139 }
1140 \f
1141 static error_t
1142 parse_opt (int key, char *arg, struct argp_state *state)
1143 {
1144   struct tar_args *args = state->input;
1145
1146   switch (key)
1147     {
1148       case ARGP_KEY_ARG:
1149         /* File name or non-parsed option, because of ARGP_IN_ORDER */
1150         name_add_name (arg, MAKE_INCL_OPTIONS (args));
1151         args->input_files = true;
1152         break;
1153
1154     case 'A':
1155       set_subcommand_option (CAT_SUBCOMMAND);
1156       break;
1157
1158     case 'b':
1159       {
1160         uintmax_t u;
1161         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1162                && u == (blocking_factor = u)
1163                && 0 < blocking_factor
1164                && u == (record_size = u * BLOCKSIZE) / BLOCKSIZE))
1165           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1166                         _("Invalid blocking factor")));
1167       }
1168       break;
1169
1170     case 'B':
1171       /* Try to reblock input records.  For reading 4.2BSD pipes.  */
1172
1173       /* It would surely make sense to exchange -B and -R, but it seems
1174          that -B has been used for a long while in Sun tar and most
1175          BSD-derived systems.  This is a consequence of the block/record
1176          terminology confusion.  */
1177
1178       read_full_records_option = true;
1179       break;
1180
1181     case 'c':
1182       set_subcommand_option (CREATE_SUBCOMMAND);
1183       break;
1184
1185     case 'C':
1186       name_add_dir (arg);
1187       break;
1188
1189     case 'd':
1190       set_subcommand_option (DIFF_SUBCOMMAND);
1191       break;
1192
1193     case 'f':
1194       if (archive_names == allocated_archive_names)
1195         archive_name_array = x2nrealloc (archive_name_array,
1196                                          &allocated_archive_names,
1197                                          sizeof (archive_name_array[0]));
1198
1199       archive_name_array[archive_names++] = arg;
1200       break;
1201
1202     case 'F':
1203       /* Since -F is only useful with -M, make it implied.  Run this
1204          script at the end of each tape.  */
1205
1206       info_script_option = arg;
1207       multi_volume_option = true;
1208       break;
1209
1210     case 'g':
1211       listed_incremental_option = arg;
1212       after_date_option = true;
1213       /* Fall through.  */
1214
1215     case 'G':
1216       /* We are making an incremental dump (FIXME: are we?); save
1217          directories at the beginning of the archive, and include in each
1218          directory its contents.  */
1219
1220       incremental_option = true;
1221       break;
1222
1223     case 'h':
1224       /* Follow symbolic links.  */
1225       dereference_option = true;
1226       break;
1227
1228     case 'i':
1229       /* Ignore zero blocks (eofs).  This can't be the default,
1230          because Unix tar writes two blocks of zeros, then pads out
1231          the record with garbage.  */
1232
1233       ignore_zeros_option = true;
1234       break;
1235
1236     case 'I':
1237       USAGE_ERROR ((0, 0,
1238                     _("Warning: the -I option is not supported;"
1239                       " perhaps you meant -j or -T?")));
1240       break;
1241
1242     case 'j':
1243       set_use_compress_program_option ("bzip2");
1244       break;
1245
1246     case 'k':
1247       /* Don't replace existing files.  */
1248       old_files_option = KEEP_OLD_FILES;
1249       break;
1250
1251     case 'K':
1252       starting_file_option = true;
1253       addname (arg, 0);
1254       break;
1255
1256     case ONE_FILE_SYSTEM_OPTION:
1257       /* When dumping directories, don't dump files/subdirectories
1258          that are on other filesystems. */
1259       one_file_system_option = true;
1260       break;
1261
1262     case 'l':
1263       check_links_option = 1;
1264       break;
1265
1266     case 'L':
1267       {
1268         uintmax_t u;
1269         if (xstrtoumax (arg, 0, 10, &u, "") != LONGINT_OK)
1270           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1271                         _("Invalid tape length")));
1272         tape_length_option = 1024 * (tarlong) u;
1273         multi_volume_option = true;
1274       }
1275       break;
1276
1277     case 'm':
1278       touch_option = true;
1279       break;
1280
1281     case 'M':
1282       /* Make multivolume archive: when we can't write any more into
1283          the archive, re-open it, and continue writing.  */
1284
1285       multi_volume_option = true;
1286       break;
1287
1288     case MTIME_OPTION:
1289       get_date_or_file (args, "--mtime", arg, &mtime_option);
1290       set_mtime_option = true;
1291       break;
1292
1293     case 'n':
1294       seekable_archive = true;
1295       break;
1296
1297     case 'N':
1298       after_date_option = true;
1299       /* Fall through.  */
1300
1301     case NEWER_MTIME_OPTION:
1302       if (NEWER_OPTION_INITIALIZED (newer_mtime_option))
1303         USAGE_ERROR ((0, 0, _("More than one threshold date")));
1304       get_date_or_file (args,
1305                         key == NEWER_MTIME_OPTION ? "--newer-mtime"
1306                           : "--after-date", arg, &newer_mtime_option);
1307       break;
1308
1309     case 'o':
1310       args->o_option = true;
1311       break;
1312
1313     case 'O':
1314       to_stdout_option = true;
1315       break;
1316
1317     case 'p':
1318       same_permissions_option = true;
1319       break;
1320
1321     case 'P':
1322       absolute_names_option = true;
1323       break;
1324
1325     case 'r':
1326       set_subcommand_option (APPEND_SUBCOMMAND);
1327       break;
1328
1329     case 'R':
1330       /* Print block numbers for debugging bad tar archives.  */
1331
1332       /* It would surely make sense to exchange -B and -R, but it seems
1333          that -B has been used for a long while in Sun tar and most
1334          BSD-derived systems.  This is a consequence of the block/record
1335          terminology confusion.  */
1336
1337       block_number_option = true;
1338       break;
1339
1340     case 's':
1341       /* Names to extract are sorted.  */
1342
1343       same_order_option = true;
1344       break;
1345
1346     case 'S':
1347       sparse_option = true;
1348       break;
1349
1350     case SPARSE_VERSION_OPTION:
1351       sparse_option = true;
1352       {
1353         char *p;
1354         tar_sparse_major = strtoul (arg, &p, 10);
1355         if (*p)
1356           {
1357             if (*p != '.')
1358               USAGE_ERROR ((0, 0, _("Invalid sparse version value")));
1359             tar_sparse_minor = strtoul (p + 1, &p, 10);
1360             if (*p)
1361               USAGE_ERROR ((0, 0, _("Invalid sparse version value")));
1362           }
1363       }
1364       break;
1365
1366     case 't':
1367       set_subcommand_option (LIST_SUBCOMMAND);
1368       verbose_option++;
1369       break;
1370
1371     case TEST_LABEL_OPTION:
1372       set_subcommand_option (LIST_SUBCOMMAND);
1373       test_label_option = true;
1374       break;
1375
1376     case 'T':
1377       update_argv (arg, state);
1378       /* Indicate we've been given -T option. This is for backward
1379          compatibility only, so that `tar cfT archive /dev/null will
1380          succeed */
1381       files_from_option = true;
1382       break;
1383
1384     case 'u':
1385       set_subcommand_option (UPDATE_SUBCOMMAND);
1386       break;
1387
1388     case 'U':
1389       old_files_option = UNLINK_FIRST_OLD_FILES;
1390       break;
1391
1392     case UTC_OPTION:
1393       utc_option = true;
1394       break;
1395
1396     case 'v':
1397       verbose_option++;
1398       break;
1399
1400     case 'V':
1401       volume_label_option = arg;
1402       break;
1403
1404     case 'w':
1405       interactive_option = true;
1406       break;
1407
1408     case 'W':
1409       verify_option = true;
1410       break;
1411
1412     case 'x':
1413       set_subcommand_option (EXTRACT_SUBCOMMAND);
1414       break;
1415
1416     case 'X':
1417       if (add_exclude_file (add_exclude, excluded, arg,
1418                             MAKE_EXCL_OPTIONS (args), '\n')
1419           != 0)
1420         {
1421           int e = errno;
1422           FATAL_ERROR ((0, e, "%s", quotearg_colon (arg)));
1423         }
1424       break;
1425
1426     case 'z':
1427       set_use_compress_program_option ("gzip");
1428       break;
1429
1430     case 'Z':
1431       set_use_compress_program_option ("compress");
1432       break;
1433
1434     case ANCHORED_OPTION:
1435       args->matching_flags |= EXCLUDE_ANCHORED;
1436       break;
1437
1438     case ATIME_PRESERVE_OPTION:
1439       atime_preserve_option =
1440         (arg
1441          ? XARGMATCH ("--atime-preserve", arg,
1442                       atime_preserve_args, atime_preserve_types)
1443          : replace_atime_preserve);
1444       if (! O_NOATIME && atime_preserve_option == system_atime_preserve)
1445         FATAL_ERROR ((0, 0,
1446                       _("--atime-preserve='system' is not supported"
1447                         " on this platform")));
1448       break;
1449
1450     case CHECKPOINT_OPTION:
1451       if (arg)
1452         {
1453           char *p;
1454
1455           if (*arg == '.')
1456             {
1457               checkpoint_style = checkpoint_dot;
1458               arg++;
1459             }
1460           checkpoint_option = strtoul (arg, &p, 0);
1461           if (*p)
1462             FATAL_ERROR ((0, 0,
1463                           _("--checkpoint value is not an integer")));
1464         }
1465       else
1466         checkpoint_option = 10;
1467       break;
1468
1469     case BACKUP_OPTION:
1470       backup_option = true;
1471       if (arg)
1472         args->version_control_string = arg;
1473       break;
1474
1475     case DELAY_DIRECTORY_RESTORE_OPTION:
1476       delay_directory_restore_option = true;
1477       break;
1478
1479     case NO_DELAY_DIRECTORY_RESTORE_OPTION:
1480       delay_directory_restore_option = false;
1481       break;
1482
1483     case DELETE_OPTION:
1484       set_subcommand_option (DELETE_SUBCOMMAND);
1485       break;
1486
1487     case EXCLUDE_OPTION:
1488       add_exclude (excluded, arg, MAKE_EXCL_OPTIONS (args));
1489       break;
1490
1491     case EXCLUDE_CACHES_OPTION:
1492       exclude_caches_option = true;
1493       break;
1494
1495     case FORCE_LOCAL_OPTION:
1496       force_local_option = true;
1497       break;
1498
1499     case 'H':
1500       set_archive_format (arg);
1501       break;
1502
1503     case INDEX_FILE_OPTION:
1504       index_file_name = arg;
1505       break;
1506
1507     case IGNORE_CASE_OPTION:
1508       args->matching_flags |= FNM_CASEFOLD;
1509       break;
1510
1511     case IGNORE_COMMAND_ERROR_OPTION:
1512       ignore_command_error_option = true;
1513       break;
1514
1515     case IGNORE_FAILED_READ_OPTION:
1516       ignore_failed_read_option = true;
1517       break;
1518
1519     case KEEP_NEWER_FILES_OPTION:
1520       old_files_option = KEEP_NEWER_FILES;
1521       break;
1522
1523     case GROUP_OPTION:
1524       if (! (strlen (arg) < GNAME_FIELD_SIZE
1525              && gname_to_gid (arg, &group_option)))
1526         {
1527           uintmax_t g;
1528           if (xstrtoumax (arg, 0, 10, &g, "") == LONGINT_OK
1529               && g == (gid_t) g)
1530             group_option = g;
1531           else
1532             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1533                           _("%s: Invalid group")));
1534         }
1535       break;
1536
1537     case MODE_OPTION:
1538       mode_option = mode_compile (arg);
1539       if (!mode_option)
1540         FATAL_ERROR ((0, 0, _("Invalid mode given on option")));
1541       initial_umask = umask (0);
1542       umask (initial_umask);
1543       break;
1544
1545     case NO_ANCHORED_OPTION:
1546       args->include_anchored = 0; /* Clear the default for comman line args */
1547       args->matching_flags &= ~ EXCLUDE_ANCHORED;
1548       break;
1549
1550     case NO_IGNORE_CASE_OPTION:
1551       args->matching_flags &= ~ FNM_CASEFOLD;
1552       break;
1553
1554     case NO_IGNORE_COMMAND_ERROR_OPTION:
1555       ignore_command_error_option = false;
1556       break;
1557
1558     case NO_OVERWRITE_DIR_OPTION:
1559       old_files_option = NO_OVERWRITE_DIR_OLD_FILES;
1560       break;
1561
1562     case NO_QUOTE_CHARS_OPTION:
1563       for (;*arg; arg++)
1564         set_char_quoting (NULL, *arg, 0);
1565       break;
1566
1567     case NO_WILDCARDS_OPTION:
1568       args->wildcards = disable_wildcards;
1569       break;
1570
1571     case NO_WILDCARDS_MATCH_SLASH_OPTION:
1572       args->matching_flags |= FNM_FILE_NAME;
1573       break;
1574
1575     case NULL_OPTION:
1576       filename_terminator = '\0';
1577       break;
1578
1579     case NUMERIC_OWNER_OPTION:
1580       numeric_owner_option = true;
1581       break;
1582
1583     case OCCURRENCE_OPTION:
1584       if (!arg)
1585         occurrence_option = 1;
1586       else
1587         {
1588           uintmax_t u;
1589           if (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK)
1590             occurrence_option = u;
1591           else
1592             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1593                           _("Invalid number")));
1594         }
1595       break;
1596
1597     case OVERWRITE_DIR_OPTION:
1598       old_files_option = DEFAULT_OLD_FILES;
1599       break;
1600
1601     case OVERWRITE_OPTION:
1602       old_files_option = OVERWRITE_OLD_FILES;
1603       break;
1604
1605     case OWNER_OPTION:
1606       if (! (strlen (arg) < UNAME_FIELD_SIZE
1607              && uname_to_uid (arg, &owner_option)))
1608         {
1609           uintmax_t u;
1610           if (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1611               && u == (uid_t) u)
1612             owner_option = u;
1613           else
1614             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1615                           _("Invalid owner")));
1616         }
1617       break;
1618
1619     case QUOTE_CHARS_OPTION:
1620       for (;*arg; arg++)
1621         set_char_quoting (NULL, *arg, 1);
1622       break;
1623
1624     case QUOTING_STYLE_OPTION:
1625       tar_set_quoting_style (arg);
1626       break;
1627
1628     case PAX_OPTION:
1629       args->pax_option = true;
1630       xheader_set_option (arg);
1631       break;
1632
1633     case POSIX_OPTION:
1634       set_archive_format ("posix");
1635       break;
1636
1637     case PRESERVE_OPTION:
1638       /* FIXME: What it is good for? */
1639       same_permissions_option = true;
1640       same_order_option = true;
1641       break;
1642
1643     case RECORD_SIZE_OPTION:
1644       {
1645         uintmax_t u;
1646         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1647                && u == (size_t) u))
1648           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1649                         _("Invalid record size")));
1650         record_size = u;
1651         if (record_size % BLOCKSIZE != 0)
1652           USAGE_ERROR ((0, 0, _("Record size must be a multiple of %d."),
1653                         BLOCKSIZE));
1654         blocking_factor = record_size / BLOCKSIZE;
1655       }
1656       break;
1657
1658     case RECURSIVE_UNLINK_OPTION:
1659       recursive_unlink_option = true;
1660       break;
1661
1662     case REMOVE_FILES_OPTION:
1663       remove_files_option = true;
1664       break;
1665
1666     case RESTRICT_OPTION:
1667       restrict_option = true;
1668       break;
1669
1670     case RMT_COMMAND_OPTION:
1671       rmt_command = arg;
1672       break;
1673
1674     case RSH_COMMAND_OPTION:
1675       rsh_command_option = arg;
1676       break;
1677
1678     case SHOW_DEFAULTS_OPTION:
1679       show_default_settings (stdout);
1680       close_stdout ();
1681       exit (0);
1682
1683     case STRIP_COMPONENTS_OPTION:
1684       {
1685         uintmax_t u;
1686         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1687                && u == (size_t) u))
1688           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1689                         _("Invalid number of elements")));
1690         strip_name_components = u;
1691       }
1692       break;
1693
1694     case SHOW_OMITTED_DIRS_OPTION:
1695       show_omitted_dirs_option = true;
1696       break;
1697
1698     case SHOW_TRANSFORMED_NAMES_OPTION:
1699       show_transformed_names_option = true;
1700       break;
1701
1702     case SUFFIX_OPTION:
1703       backup_option = true;
1704       args->backup_suffix_string = arg;
1705       break;
1706
1707     case TO_COMMAND_OPTION:
1708       if (to_command_option)
1709         USAGE_ERROR ((0, 0, _("Only one --to-command option allowed")));
1710       to_command_option = arg;
1711       break;
1712
1713     case TOTALS_OPTION:
1714       if (arg)
1715         set_stat_signal (arg);
1716       else
1717         totals_option = true;
1718       break;
1719
1720     case TRANSFORM_OPTION:
1721       set_transform_expr (arg);
1722       break;
1723
1724     case USE_COMPRESS_PROGRAM_OPTION:
1725       set_use_compress_program_option (arg);
1726       break;
1727
1728     case VOLNO_FILE_OPTION:
1729       volno_file_option = arg;
1730       break;
1731
1732     case WILDCARDS_OPTION:
1733       args->wildcards = enable_wildcards;
1734       break;
1735
1736     case WILDCARDS_MATCH_SLASH_OPTION:
1737       args->matching_flags &= ~ FNM_FILE_NAME;
1738       break;
1739
1740     case NO_RECURSION_OPTION:
1741       recursion_option = 0;
1742       break;
1743
1744     case NO_SAME_OWNER_OPTION:
1745       same_owner_option = -1;
1746       break;
1747
1748     case NO_SAME_PERMISSIONS_OPTION:
1749       same_permissions_option = -1;
1750       break;
1751
1752     case RECURSION_OPTION:
1753       recursion_option = FNM_LEADING_DIR;
1754       break;
1755
1756     case SAME_OWNER_OPTION:
1757       same_owner_option = 1;
1758       break;
1759
1760     case UNQUOTE_OPTION:
1761       unquote_option = true;
1762       break;
1763
1764     case NO_UNQUOTE_OPTION:
1765       unquote_option = false;
1766       break;
1767
1768     case '0':
1769     case '1':
1770     case '2':
1771     case '3':
1772     case '4':
1773     case '5':
1774     case '6':
1775     case '7':
1776
1777 #ifdef DEVICE_PREFIX
1778       {
1779         int device = key - '0';
1780         int density;
1781         static char buf[sizeof DEVICE_PREFIX + 10];
1782         char *cursor;
1783
1784         if (arg[1])
1785           argp_error (state, _("Malformed density argument: %s"), quote (arg));
1786
1787         strcpy (buf, DEVICE_PREFIX);
1788         cursor = buf + strlen (buf);
1789
1790 #ifdef DENSITY_LETTER
1791
1792         sprintf (cursor, "%d%c", device, arg[0]);
1793
1794 #else /* not DENSITY_LETTER */
1795
1796         switch (arg[0])
1797           {
1798           case 'l':
1799             device += LOW_DENSITY_NUM;
1800             break;
1801
1802           case 'm':
1803             device += MID_DENSITY_NUM;
1804             break;
1805
1806           case 'h':
1807             device += HIGH_DENSITY_NUM;
1808             break;
1809
1810           default:
1811             argp_error (state, _("Unknown density: `%c'"), arg[0]);
1812           }
1813         sprintf (cursor, "%d", device);
1814
1815 #endif /* not DENSITY_LETTER */
1816
1817         if (archive_names == allocated_archive_names)
1818           archive_name_array = x2nrealloc (archive_name_array,
1819                                            &allocated_archive_names,
1820                                            sizeof (archive_name_array[0]));
1821         archive_name_array[archive_names++] = xstrdup (buf);
1822       }
1823       break;
1824
1825 #else /* not DEVICE_PREFIX */
1826
1827       argp_error (state,
1828                   _("Options `-[0-7][lmh]' not supported by *this* tar"));
1829
1830 #endif /* not DEVICE_PREFIX */
1831
1832     case '?':
1833       tar_help (state);
1834       close_stdout ();
1835       exit (0);
1836
1837     case USAGE_OPTION:
1838       argp_state_help (state, state->out_stream, ARGP_HELP_USAGE);
1839       close_stdout ();
1840       exit (0);
1841
1842     case VERSION_OPTION:
1843       version_etc (state->out_stream, "tar", PACKAGE_NAME, VERSION,
1844                    "John Gilmore", "Jay Fenlason", (char *) NULL);
1845       close_stdout ();
1846       exit (0);
1847
1848     case HANG_OPTION:
1849       _argp_hang = atoi (arg ? arg : "3600");
1850       while (_argp_hang-- > 0)
1851         sleep (1);
1852       break;
1853
1854     default:
1855       return ARGP_ERR_UNKNOWN;
1856     }
1857   return 0;
1858 }
1859
1860 static struct argp argp = {
1861   options,
1862   parse_opt,
1863   N_("[FILE]..."),
1864   doc,
1865   NULL,
1866   NULL,
1867   NULL
1868 };
1869
1870 void
1871 usage (int status)
1872 {
1873   argp_help (&argp, stderr, ARGP_HELP_SEE, (char*) program_name);
1874   close_stdout ();
1875   exit (status);
1876 }
1877
1878 /* Parse the options for tar.  */
1879
1880 static struct argp_option *
1881 find_argp_option (struct argp_option *options, int letter)
1882 {
1883   for (;
1884        !(options->name == NULL
1885          && options->key == 0
1886          && options->arg == 0
1887          && options->flags == 0
1888          && options->doc == NULL); options++)
1889     if (options->key == letter)
1890       return options;
1891   return NULL;
1892 }
1893
1894 static void
1895 decode_options (int argc, char **argv)
1896 {
1897   int index;
1898   struct tar_args args;
1899
1900   /* Set some default option values.  */
1901   args.textual_date = NULL;
1902   args.wildcards = default_wildcards;
1903   args.matching_flags = 0;
1904   args.include_anchored = EXCLUDE_ANCHORED;
1905   args.o_option = false;
1906   args.pax_option = false;
1907   args.backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
1908   args.version_control_string = 0;
1909   args.input_files = false;
1910
1911   subcommand_option = UNKNOWN_SUBCOMMAND;
1912   archive_format = DEFAULT_FORMAT;
1913   blocking_factor = DEFAULT_BLOCKING;
1914   record_size = DEFAULT_BLOCKING * BLOCKSIZE;
1915   excluded = new_exclude ();
1916   newer_mtime_option.tv_sec = TYPE_MINIMUM (time_t);
1917   newer_mtime_option.tv_nsec = -1;
1918   recursion_option = FNM_LEADING_DIR;
1919   unquote_option = true;
1920   tar_sparse_major = 1;
1921   tar_sparse_minor = 0;
1922
1923   owner_option = -1;
1924   group_option = -1;
1925
1926   /* Convert old-style tar call by exploding option element and rearranging
1927      options accordingly.  */
1928
1929   if (argc > 1 && argv[1][0] != '-')
1930     {
1931       int new_argc;             /* argc value for rearranged arguments */
1932       char **new_argv;          /* argv value for rearranged arguments */
1933       char *const *in;          /* cursor into original argv */
1934       char **out;               /* cursor into rearranged argv */
1935       const char *letter;       /* cursor into old option letters */
1936       char buffer[3];           /* constructed option buffer */
1937
1938       /* Initialize a constructed option.  */
1939
1940       buffer[0] = '-';
1941       buffer[2] = '\0';
1942
1943       /* Allocate a new argument array, and copy program name in it.  */
1944
1945       new_argc = argc - 1 + strlen (argv[1]);
1946       new_argv = xmalloc ((new_argc + 1) * sizeof (char *));
1947       in = argv;
1948       out = new_argv;
1949       *out++ = *in++;
1950
1951       /* Copy each old letter option as a separate option, and have the
1952          corresponding argument moved next to it.  */
1953
1954       for (letter = *in++; *letter; letter++)
1955         {
1956           struct argp_option *opt;
1957
1958           buffer[1] = *letter;
1959           *out++ = xstrdup (buffer);
1960           opt = find_argp_option (options, *letter);
1961           if (opt && opt->arg)
1962             {
1963               if (in < argv + argc)
1964                 *out++ = *in++;
1965               else
1966                 USAGE_ERROR ((0, 0, _("Old option `%c' requires an argument."),
1967                               *letter));
1968             }
1969         }
1970
1971       /* Copy all remaining options.  */
1972
1973       while (in < argv + argc)
1974         *out++ = *in++;
1975       *out = 0;
1976
1977       /* Replace the old option list by the new one.  */
1978
1979       argc = new_argc;
1980       argv = new_argv;
1981     }
1982
1983   /* Parse all options and non-options as they appear.  */
1984
1985   prepend_default_options (getenv ("TAR_OPTIONS"), &argc, &argv);
1986
1987   if (argp_parse (&argp, argc, argv, ARGP_IN_ORDER|ARGP_NO_HELP,
1988                   &index, &args))
1989     exit (TAREXIT_FAILURE);
1990
1991
1992   /* Special handling for 'o' option:
1993
1994      GNU tar used to say "output old format".
1995      UNIX98 tar says don't chown files after extracting (we use
1996      "--no-same-owner" for this).
1997
1998      The old GNU tar semantics is retained when used with --create
1999      option, otherwise UNIX98 semantics is assumed */
2000
2001   if (args.o_option)
2002     {
2003       if (subcommand_option == CREATE_SUBCOMMAND)
2004         {
2005           /* GNU Tar <= 1.13 compatibility */
2006           set_archive_format ("v7");
2007         }
2008       else
2009         {
2010           /* UNIX98 compatibility */
2011           same_owner_option = -1;
2012         }
2013     }
2014
2015   /* Handle operands after any "--" argument.  */
2016   for (; index < argc; index++)
2017     {
2018       name_add_name (argv[index], MAKE_INCL_OPTIONS (&args));
2019       args.input_files = true;
2020     }
2021
2022   /* Warn about implicit use of the wildcards in command line arguments.
2023      See TODO */
2024   warn_regex_usage = args.wildcards == default_wildcards;
2025
2026   /* Derive option values and check option consistency.  */
2027
2028   if (archive_format == DEFAULT_FORMAT)
2029     {
2030       if (args.pax_option)
2031         archive_format = POSIX_FORMAT;
2032       else
2033         archive_format = DEFAULT_ARCHIVE_FORMAT;
2034     }
2035
2036   if ((volume_label_option && subcommand_option == CREATE_SUBCOMMAND)
2037       || incremental_option
2038       || multi_volume_option
2039       || sparse_option)
2040     assert_format (FORMAT_MASK (OLDGNU_FORMAT)
2041                    | FORMAT_MASK (GNU_FORMAT)
2042                    | FORMAT_MASK (POSIX_FORMAT));
2043
2044   if (occurrence_option)
2045     {
2046       if (!args.input_files)
2047         USAGE_ERROR ((0, 0,
2048                       _("--occurrence is meaningless without a file list")));
2049       if (subcommand_option != DELETE_SUBCOMMAND
2050           && subcommand_option != DIFF_SUBCOMMAND
2051           && subcommand_option != EXTRACT_SUBCOMMAND
2052           && subcommand_option != LIST_SUBCOMMAND)
2053             USAGE_ERROR ((0, 0,
2054                           _("--occurrence cannot be used in the requested operation mode")));
2055     }
2056
2057   if (seekable_archive && subcommand_option == DELETE_SUBCOMMAND)
2058     {
2059       /* The current code in delete.c is based on the assumption that
2060          skip_member() reads all data from the archive. So, we should
2061          make sure it won't use seeks. On the other hand, the same code
2062          depends on the ability to backspace a record in the archive,
2063          so setting seekable_archive to false is technically incorrect.
2064          However, it is tested only in skip_member(), so it's not a
2065          problem. */
2066       seekable_archive = false;
2067     }
2068
2069   if (archive_names == 0)
2070     {
2071       /* If no archive file name given, try TAPE from the environment, or
2072          else, DEFAULT_ARCHIVE from the configuration process.  */
2073
2074       archive_names = 1;
2075       archive_name_array[0] = getenv ("TAPE");
2076       if (! archive_name_array[0])
2077         archive_name_array[0] = DEFAULT_ARCHIVE;
2078     }
2079
2080   /* Allow multiple archives only with `-M'.  */
2081
2082   if (archive_names > 1 && !multi_volume_option)
2083     USAGE_ERROR ((0, 0,
2084                   _("Multiple archive files require `-M' option")));
2085
2086   if (listed_incremental_option
2087       && NEWER_OPTION_INITIALIZED (newer_mtime_option))
2088     USAGE_ERROR ((0, 0,
2089                   _("Cannot combine --listed-incremental with --newer")));
2090
2091   if (volume_label_option)
2092     {
2093       if (archive_format == GNU_FORMAT || archive_format == OLDGNU_FORMAT)
2094         {
2095           size_t volume_label_max_len =
2096             (sizeof current_header->header.name
2097              - 1 /* for trailing '\0' */
2098              - (multi_volume_option
2099                 ? (sizeof " Volume "
2100                    - 1 /* for null at end of " Volume " */
2101                    + INT_STRLEN_BOUND (int) /* for volume number */
2102                    - 1 /* for sign, as 0 <= volno */)
2103                 : 0));
2104           if (volume_label_max_len < strlen (volume_label_option))
2105             USAGE_ERROR ((0, 0,
2106                           ngettext ("%s: Volume label is too long (limit is %lu byte)",
2107                                     "%s: Volume label is too long (limit is %lu bytes)",
2108                                     volume_label_max_len),
2109                           quotearg_colon (volume_label_option),
2110                           (unsigned long) volume_label_max_len));
2111         }
2112       /* else FIXME
2113          Label length in PAX format is limited by the volume size. */
2114     }
2115
2116   if (verify_option)
2117     {
2118       if (multi_volume_option)
2119         USAGE_ERROR ((0, 0, _("Cannot verify multi-volume archives")));
2120       if (use_compress_program_option)
2121         USAGE_ERROR ((0, 0, _("Cannot verify compressed archives")));
2122     }
2123
2124   if (use_compress_program_option)
2125     {
2126       if (multi_volume_option)
2127         USAGE_ERROR ((0, 0, _("Cannot use multi-volume compressed archives")));
2128       if (subcommand_option == UPDATE_SUBCOMMAND
2129           || subcommand_option == APPEND_SUBCOMMAND
2130           || subcommand_option == DELETE_SUBCOMMAND)
2131         USAGE_ERROR ((0, 0, _("Cannot update compressed archives")));
2132       if (subcommand_option == CAT_SUBCOMMAND)
2133         USAGE_ERROR ((0, 0, _("Cannot concatenate compressed archives")));
2134     }
2135
2136   /* It is no harm to use --pax-option on non-pax archives in archive
2137      reading mode. It may even be useful, since it allows to override
2138      file attributes from tar headers. Therefore I allow such usage.
2139      --gray */
2140   if (args.pax_option
2141       && archive_format != POSIX_FORMAT
2142       && (subcommand_option != EXTRACT_SUBCOMMAND
2143           || subcommand_option != DIFF_SUBCOMMAND
2144           || subcommand_option != LIST_SUBCOMMAND))
2145     USAGE_ERROR ((0, 0, _("--pax-option can be used only on POSIX archives")));
2146
2147   /* If ready to unlink hierarchies, so we are for simpler files.  */
2148   if (recursive_unlink_option)
2149     old_files_option = UNLINK_FIRST_OLD_FILES;
2150
2151
2152   if (test_label_option)
2153     {
2154       /* --test-label is silent if the user has specified the label name to
2155          compare against. */
2156       if (!args.input_files)
2157         verbose_option++;
2158     }
2159   else if (utc_option)
2160     verbose_option = 2;
2161
2162   /* Forbid using -c with no input files whatsoever.  Check that `-f -',
2163      explicit or implied, is used correctly.  */
2164
2165   switch (subcommand_option)
2166     {
2167     case CREATE_SUBCOMMAND:
2168       if (!args.input_files && !files_from_option)
2169         USAGE_ERROR ((0, 0,
2170                       _("Cowardly refusing to create an empty archive")));
2171       break;
2172
2173     case EXTRACT_SUBCOMMAND:
2174     case LIST_SUBCOMMAND:
2175     case DIFF_SUBCOMMAND:
2176       for (archive_name_cursor = archive_name_array;
2177            archive_name_cursor < archive_name_array + archive_names;
2178            archive_name_cursor++)
2179         if (!strcmp (*archive_name_cursor, "-"))
2180           request_stdin ("-f");
2181       break;
2182
2183     case CAT_SUBCOMMAND:
2184     case UPDATE_SUBCOMMAND:
2185     case APPEND_SUBCOMMAND:
2186       for (archive_name_cursor = archive_name_array;
2187            archive_name_cursor < archive_name_array + archive_names;
2188            archive_name_cursor++)
2189         if (!strcmp (*archive_name_cursor, "-"))
2190           USAGE_ERROR ((0, 0,
2191                         _("Options `-Aru' are incompatible with `-f -'")));
2192
2193     default:
2194       break;
2195     }
2196
2197   /* Initialize stdlis */
2198   if (index_file_name)
2199     {
2200       stdlis = fopen (index_file_name, "w");
2201       if (! stdlis)
2202         open_error (index_file_name);
2203     }
2204   else
2205     stdlis = to_stdout_option ? stderr : stdout;
2206
2207   archive_name_cursor = archive_name_array;
2208
2209   /* Prepare for generating backup names.  */
2210
2211   if (args.backup_suffix_string)
2212     simple_backup_suffix = xstrdup (args.backup_suffix_string);
2213
2214   if (backup_option)
2215     {
2216       backup_type = xget_version ("--backup", args.version_control_string);
2217       /* No backup is needed either if explicitely disabled or if
2218          the extracted files are not being written to disk. */
2219       if (backup_type == no_backups || EXTRACT_OVER_PIPE)
2220         backup_option = false;
2221     }
2222
2223   if (verbose_option)
2224     report_textual_dates (&args);
2225 }
2226
2227 \f
2228 /* Tar proper.  */
2229
2230 /* Main routine for tar.  */
2231 int
2232 main (int argc, char **argv)
2233 {
2234   set_start_time ();
2235   program_name = argv[0];
2236
2237   setlocale (LC_ALL, "");
2238   bindtextdomain (PACKAGE, LOCALEDIR);
2239   textdomain (PACKAGE);
2240
2241   exit_failure = TAREXIT_FAILURE;
2242   exit_status = TAREXIT_SUCCESS;
2243   filename_terminator = '\n';
2244   set_quoting_style (0, DEFAULT_QUOTING_STYLE);
2245
2246   /* Make sure we have first three descriptors available */
2247   stdopen ();
2248
2249   /* Close all inherited open descriptors, except for the first three */
2250   closeopen ();
2251
2252   /* Pre-allocate a few structures.  */
2253
2254   allocated_archive_names = 10;
2255   archive_name_array =
2256     xmalloc (sizeof (const char *) * allocated_archive_names);
2257   archive_names = 0;
2258
2259   obstack_init (&argv_stk);
2260
2261 #ifdef SIGCHLD
2262   /* System V fork+wait does not work if SIGCHLD is ignored.  */
2263   signal (SIGCHLD, SIG_DFL);
2264 #endif
2265
2266   /* Decode options.  */
2267
2268   decode_options (argc, argv);
2269   name_init ();
2270
2271   /* Main command execution.  */
2272
2273   if (volno_file_option)
2274     init_volume_number ();
2275
2276   switch (subcommand_option)
2277     {
2278     case UNKNOWN_SUBCOMMAND:
2279       USAGE_ERROR ((0, 0,
2280                     _("You must specify one of the `-Acdtrux' options")));
2281
2282     case CAT_SUBCOMMAND:
2283     case UPDATE_SUBCOMMAND:
2284     case APPEND_SUBCOMMAND:
2285       update_archive ();
2286       break;
2287
2288     case DELETE_SUBCOMMAND:
2289       delete_archive_members ();
2290       break;
2291
2292     case CREATE_SUBCOMMAND:
2293       create_archive ();
2294       break;
2295
2296     case EXTRACT_SUBCOMMAND:
2297       extr_init ();
2298       read_and (extract_archive);
2299
2300       /* FIXME: should extract_finish () even if an ordinary signal is
2301          received.  */
2302       extract_finish ();
2303
2304       break;
2305
2306     case LIST_SUBCOMMAND:
2307       read_and (list_archive);
2308       break;
2309
2310     case DIFF_SUBCOMMAND:
2311       diff_init ();
2312       read_and (diff_archive);
2313       break;
2314     }
2315
2316   if (totals_option)
2317     print_total_stats ();
2318
2319   if (check_links_option)
2320     check_links ();
2321
2322   if (volno_file_option)
2323     closeout_volume_number ();
2324
2325   /* Dispose of allocated memory, and return.  */
2326
2327   free (archive_name_array);
2328   name_term ();
2329
2330   if (exit_status == TAREXIT_FAILURE)
2331     error (0, 0, _("Error exit delayed from previous errors"));
2332
2333   if (stdlis == stdout)
2334     close_stdout ();
2335   else if (ferror (stderr) || fclose (stderr) != 0)
2336     exit_status = TAREXIT_FAILURE;
2337
2338   return exit_status;
2339 }
2340
2341 void
2342 tar_stat_init (struct tar_stat_info *st)
2343 {
2344   memset (st, 0, sizeof (*st));
2345 }
2346
2347 void
2348 tar_stat_destroy (struct tar_stat_info *st)
2349 {
2350   free (st->orig_file_name);
2351   free (st->file_name);
2352   free (st->link_name);
2353   free (st->uname);
2354   free (st->gname);
2355   free (st->sparse_map);
2356   free (st->dumpdir);
2357   memset (st, 0, sizeof (*st));
2358 }
2359
2360 /* Format mask for all available formats that support nanosecond
2361    timestamp resolution. */
2362 #define NS_PRECISION_FORMAT_MASK FORMAT_MASK (POSIX_FORMAT)
2363
2364 /* Same as timespec_cmp, but ignore nanoseconds if current archive
2365    format does not provide sufficient resolution.  */
2366 int
2367 tar_timespec_cmp (struct timespec a, struct timespec b)
2368 {
2369   if (!(FORMAT_MASK (current_format) & NS_PRECISION_FORMAT_MASK))
2370     a.tv_nsec = b.tv_nsec = 0;
2371   return timespec_cmp (a, b);
2372 }