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, 2007 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 3, 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 <configmake.h>
  45 #include <exitfail.h>
  46 #include <getdate.h>
  47 #include <rmt.h>
  48 #include <rmt-command.h>
  49 #include <prepargs.h>
  50 #include <quotearg.h>
  51 #include <version-etc.h>
  52 #include <xstrtol.h>
  53 #include <stdopen.h>
  54
  55 /* Local declarations.  */
  56
  57 #ifndef DEFAULT_ARCHIVE_FORMAT
  58 # define DEFAULT_ARCHIVE_FORMAT GNU_FORMAT
  59 #endif
  60
  61 #ifndef DEFAULT_ARCHIVE
  62 # define DEFAULT_ARCHIVE "tar.out"
  63 #endif
  64
  65 #ifndef DEFAULT_BLOCKING
  66 # define DEFAULT_BLOCKING 20
  67 #endif
  68
  69 \f
  70 /* Miscellaneous.  */
  71
  72 /* Name of option using stdin.  */
  73 static const char *stdin_used_by;
  74
  75 /* Doesn't return if stdin already requested.  */
  76 void
  77 request_stdin (const char *option)
  78 {
  79   if (stdin_used_by)
  80     USAGE_ERROR ((0, 0, _("Options `-%s' and `-%s' both want standard input"),
  81                   stdin_used_by, option));
  82
  83   stdin_used_by = option;
  84 }
  85
  86 extern int rpmatch (char const *response);
  87
  88 /* Returns true if and only if the user typed an affirmative response.  */
  89 int
  90 confirm (const char *message_action, const char *message_name)
  91 {
  92   static FILE *confirm_file;
  93   static int confirm_file_EOF;
  94   bool status = false;
  95
  96   if (!confirm_file)
  97     {
  98       if (archive == 0 || stdin_used_by)
  99         {
 100           confirm_file = fopen (TTY_NAME, "r");
 101           if (! confirm_file)
 102             open_fatal (TTY_NAME);
 103         }
 104       else
 105         {
 106           request_stdin ("-w");
 107           confirm_file = stdin;
 108         }
 109     }
 110
 111   fprintf (stdlis, "%s %s?", message_action, quote (message_name));
 112   fflush (stdlis);
 113
 114   if (!confirm_file_EOF)
 115     {
 116       char *response = NULL;
 117       size_t response_size = 0;
 118       if (getline (&response, &response_size, confirm_file) < 0)
 119         confirm_file_EOF = 1;
 120       else
 121         status = rpmatch (response) > 0;
 122       free (response);
 123     }
 124
 125   if (confirm_file_EOF)
 126     {
 127       fputc ('\n', stdlis);
 128       fflush (stdlis);
 129     }
 130
 131   return status;
 132 }
 133
 134 static struct fmttab {
 135   char const *name;
 136   enum archive_format fmt;
 137 } const fmttab[] = {
 138   { "v7",      V7_FORMAT },
 139   { "oldgnu",  OLDGNU_FORMAT },
 140   { "ustar",   USTAR_FORMAT },
 141   { "posix",   POSIX_FORMAT },
 142 #if 0 /* not fully supported yet */
 143   { "star",    STAR_FORMAT },
 144 #endif
 145   { "gnu",     GNU_FORMAT },
 146   { "pax",     POSIX_FORMAT }, /* An alias for posix */
 147   { NULL,      0 }
 148 };
 149
 150 static void
 151 set_archive_format (char const *name)
 152 {
 153   struct fmttab const *p;
 154
 155   for (p = fmttab; strcmp (p->name, name) != 0; )
 156     if (! (++p)->name)
 157       USAGE_ERROR ((0, 0, _("%s: Invalid archive format"),
 158                     quotearg_colon (name)));
 159
 160   archive_format = p->fmt;
 161 }
 162
 163 const char *
 164 archive_format_string (enum archive_format fmt)
 165 {
 166   struct fmttab const *p;
 167
 168   for (p = fmttab; p->name; p++)
 169     if (p->fmt == fmt)
 170       return p->name;
 171   return "unknown?";
 172 }
 173
 174 #define FORMAT_MASK(n) (1<<(n))
 175
 176 static void
 177 assert_format(unsigned fmt_mask)
 178 {
 179   if ((FORMAT_MASK (archive_format) & fmt_mask) == 0)
 180     USAGE_ERROR ((0, 0,
 181                   _("GNU features wanted on incompatible archive format")));
 182 }
 183
 184 const char *
 185 subcommand_string (enum subcommand c)
 186 {
 187   switch (c)
 188     {
 189     case UNKNOWN_SUBCOMMAND:
 190       return "unknown?";
 191
 192     case APPEND_SUBCOMMAND:
 193       return "-r";
 194
 195     case CAT_SUBCOMMAND:
 196       return "-A";
 197
 198     case CREATE_SUBCOMMAND:
 199       return "-c";
 200
 201     case DELETE_SUBCOMMAND:
 202       return "-D";
 203
 204     case DIFF_SUBCOMMAND:
 205       return "-d";
 206
 207     case EXTRACT_SUBCOMMAND:
 208       return "-x";
 209
 210     case LIST_SUBCOMMAND:
 211       return "-t";
 212
 213     case UPDATE_SUBCOMMAND:
 214       return "-u";
 215
 216     default:
 217       abort ();
 218     }
 219 }
 220
 221 void
 222 tar_list_quoting_styles (argp_fmtstream_t fs, char *prefix)
 223 {
 224   int i;
 225
 226   for (i = 0; quoting_style_args[i]; i++)
 227     argp_fmtstream_printf (fs, "%s%s\n", prefix, quoting_style_args[i]);
 228 }
 229
 230 void
 231 tar_set_quoting_style (char *arg)
 232 {
 233   int i;
 234
 235   for (i = 0; quoting_style_args[i]; i++)
 236     if (strcmp (arg, quoting_style_args[i]) == 0)
 237       {
 238         set_quoting_style (NULL, i);
 239         return;
 240       }
 241   FATAL_ERROR ((0, 0,
 242                 _("Unknown quoting style `%s'. Try `%s --quoting-style=help' to get a list."), arg, program_invocation_short_name));
 243 }
 244
 245 \f
 246 /* Options.  */
 247
 248 enum
 249 {
 250   ANCHORED_OPTION = CHAR_MAX + 1,
 251   ATIME_PRESERVE_OPTION,
 252   BACKUP_OPTION,
 253   CHECKPOINT_OPTION,
 254   DELAY_DIRECTORY_RESTORE_OPTION,
 255   DELETE_OPTION,
 256   EXCLUDE_CACHES_OPTION,
 257   EXCLUDE_CACHES_UNDER_OPTION,
 258   EXCLUDE_CACHES_ALL_OPTION,
 259   EXCLUDE_OPTION,
 260   EXCLUDE_TAG_OPTION,
 261   EXCLUDE_TAG_UNDER_OPTION,
 262   EXCLUDE_TAG_ALL_OPTION,
 263   FORCE_LOCAL_OPTION,
 264   GROUP_OPTION,
 265   HANG_OPTION,
 266   IGNORE_CASE_OPTION,
 267   IGNORE_COMMAND_ERROR_OPTION,
 268   IGNORE_FAILED_READ_OPTION,
 269   INDEX_FILE_OPTION,
 270   KEEP_NEWER_FILES_OPTION,
 271   MODE_OPTION,
 272   MTIME_OPTION,
 273   NEWER_MTIME_OPTION,
 274   NO_ANCHORED_OPTION,
 275   NO_DELAY_DIRECTORY_RESTORE_OPTION,
 276   NO_IGNORE_CASE_OPTION,
 277   NO_IGNORE_COMMAND_ERROR_OPTION,
 278   NO_OVERWRITE_DIR_OPTION,
 279   NO_QUOTE_CHARS_OPTION,
 280   NO_RECURSION_OPTION,
 281   NO_SAME_OWNER_OPTION,
 282   NO_SAME_PERMISSIONS_OPTION,
 283   NO_UNQUOTE_OPTION,
 284   NO_WILDCARDS_MATCH_SLASH_OPTION,
 285   NO_WILDCARDS_OPTION,
 286   NULL_OPTION,
 287   NUMERIC_OWNER_OPTION,
 288   OCCURRENCE_OPTION,
 289   OLD_ARCHIVE_OPTION,
 290   ONE_FILE_SYSTEM_OPTION,
 291   OVERWRITE_DIR_OPTION,
 292   OVERWRITE_OPTION,
 293   OWNER_OPTION,
 294   PAX_OPTION,
 295   POSIX_OPTION,
 296   PRESERVE_OPTION,
 297   QUOTE_CHARS_OPTION,
 298   QUOTING_STYLE_OPTION,
 299   RECORD_SIZE_OPTION,
 300   RECURSION_OPTION,
 301   RECURSIVE_UNLINK_OPTION,
 302   REMOVE_FILES_OPTION,
 303   RESTRICT_OPTION,
 304   RMT_COMMAND_OPTION,
 305   RSH_COMMAND_OPTION,
 306   SAME_OWNER_OPTION,
 307   SHOW_DEFAULTS_OPTION,
 308   SHOW_OMITTED_DIRS_OPTION,
 309   SHOW_TRANSFORMED_NAMES_OPTION,
 310   SPARSE_VERSION_OPTION,
 311   STRIP_COMPONENTS_OPTION,
 312   SUFFIX_OPTION,
 313   TEST_LABEL_OPTION,
 314   TOTALS_OPTION,
 315   TO_COMMAND_OPTION,
 316   TRANSFORM_OPTION,
 317   UNQUOTE_OPTION,
 318   USAGE_OPTION,
 319   USE_COMPRESS_PROGRAM_OPTION,
 320   UTC_OPTION,
 321   VERSION_OPTION,
 322   VOLNO_FILE_OPTION,
 323   WILDCARDS_MATCH_SLASH_OPTION,
 324   WILDCARDS_OPTION
 325 };
 326
 327 const char *argp_program_version = "tar (" PACKAGE_NAME ") " VERSION;
 328 const char *argp_program_bug_address = "<" PACKAGE_BUGREPORT ">";
 329 static char const doc[] = N_("\
 330 GNU `tar' saves many files together into a single tape or disk archive, \
 331 and can restore individual files from the archive.\n\
 332 \n\
 333 Examples:\n\
 334   tar -cf archive.tar foo bar  # Create archive.tar from files foo and bar.\n\
 335   tar -tvf archive.tar         # List all files in archive.tar verbosely.\n\
 336   tar -xf archive.tar          # Extract all files from archive.tar.\n")
 337 "\v"
 338 N_("The backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
 339 The version control may be set with --backup or VERSION_CONTROL, values are:\n\n\
 340   none, off       never make backups\n\
 341   t, numbered     make numbered backups\n\
 342   nil, existing   numbered if numbered backups exist, simple otherwise\n\
 343   never, simple   always make simple backups\n");
 344
 345
 346 /* NOTE:
 347
 348    Available option letters are DEIJQY and aeqy. Consider the following
 349    assignments:
 350
 351    [For Solaris tar compatibility =/= Is it important at all?]
 352    e  exit immediately with a nonzero exit status if unexpected errors occur
 353    E  use extended headers (--format=posix)
 354
 355    [q  alias for --occurrence=1 =/= this would better be used for quiet?]
 356    [I  same as T =/= will harm star compatibility]
 357
 358    y  per-file gzip compression
 359    Y  per-block gzip compression */
 360
 361 static struct argp_option options[] = {
 362 #define GRID 10
 363   {NULL, 0, NULL, 0,
 364    N_("Main operation mode:"), GRID },
 365
 366   {"list", 't', 0, 0,
 367    N_("list the contents of an archive"), GRID+1 },
 368   {"extract", 'x', 0, 0,
 369    N_("extract files from an archive"), GRID+1 },
 370   {"get", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 371   {"create", 'c', 0, 0,
 372    N_("create a new archive"), GRID+1 },
 373   {"diff", 'd', 0, 0,
 374    N_("find differences between archive and file system"), GRID+1 },
 375   {"compare", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 376   {"append", 'r', 0, 0,
 377    N_("append files to the end of an archive"), GRID+1 },
 378   {"update", 'u', 0, 0,
 379    N_("only append files newer than copy in archive"), GRID+1 },
 380   {"catenate", 'A', 0, 0,
 381    N_("append tar files to an archive"), GRID+1 },
 382   {"concatenate", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 383   {"delete", DELETE_OPTION, 0, 0,
 384    N_("delete from the archive (not on mag tapes!)"), GRID+1 },
 385   {"test-label", TEST_LABEL_OPTION, NULL, 0,
 386    N_("test the archive volume label and exit"), GRID+1 },
 387 #undef GRID
 388
 389 #define GRID 20
 390   {NULL, 0, NULL, 0,
 391    N_("Operation modifiers:"), GRID },
 392
 393   {"sparse", 'S', 0, 0,
 394    N_("handle sparse files efficiently"), GRID+1 },
 395   {"sparse-version", SPARSE_VERSION_OPTION, N_("MAJOR[.MINOR]"), 0,
 396    N_("set version of the sparse format to use (implies --sparse)"), GRID+1},
 397   {"incremental", 'G', 0, 0,
 398    N_("handle old GNU-format incremental backup"), GRID+1 },
 399   {"listed-incremental", 'g', N_("FILE"), 0,
 400    N_("handle new GNU-format incremental backup"), GRID+1 },
 401   {"ignore-failed-read", IGNORE_FAILED_READ_OPTION, 0, 0,
 402    N_("do not exit with nonzero on unreadable files"), GRID+1 },
 403   {"occurrence", OCCURRENCE_OPTION, N_("NUMBER"), OPTION_ARG_OPTIONAL,
 404    N_("process only the NUMBERth occurrence of each file in the archive;"
 405       " this option is valid only in conjunction with one of the subcommands"
 406       " --delete, --diff, --extract or --list and when a list of files"
 407       " is given either on the command line or via the -T option;"
 408       " NUMBER defaults to 1"), GRID+1 },
 409   {"seek", 'n', NULL, 0,
 410    N_("archive is seekable"), GRID+1 },
 411 #undef GRID
 412
 413 #define GRID 30
 414   {NULL, 0, NULL, 0,
 415    N_("Overwrite control:"), GRID },
 416
 417   {"verify", 'W', 0, 0,
 418    N_("attempt to verify the archive after writing it"), GRID+1 },
 419   {"remove-files", REMOVE_FILES_OPTION, 0, 0,
 420    N_("remove files after adding them to the archive"), GRID+1 },
 421   {"keep-old-files", 'k', 0, 0,
 422    N_("don't replace existing files when extracting"), GRID+1 },
 423   {"keep-newer-files", KEEP_NEWER_FILES_OPTION, 0, 0,
 424    N_("don't replace existing files that are newer than their archive copies"), GRID+1 },
 425   {"overwrite", OVERWRITE_OPTION, 0, 0,
 426    N_("overwrite existing files when extracting"), GRID+1 },
 427   {"unlink-first", 'U', 0, 0,
 428    N_("remove each file prior to extracting over it"), GRID+1 },
 429   {"recursive-unlink", RECURSIVE_UNLINK_OPTION, 0, 0,
 430    N_("empty hierarchies prior to extracting directory"), GRID+1 },
 431   {"no-overwrite-dir", NO_OVERWRITE_DIR_OPTION, 0, 0,
 432    N_("preserve metadata of existing directories"), GRID+1 },
 433   {"overwrite-dir", OVERWRITE_DIR_OPTION, 0, 0,
 434    N_("overwrite metadata of existing directories when extracting (default)"),
 435    GRID+1 },
 436 #undef GRID
 437
 438 #define GRID 40
 439   {NULL, 0, NULL, 0,
 440    N_("Select output stream:"), GRID },
 441
 442   {"to-stdout", 'O', 0, 0,
 443    N_("extract files to standard output"), GRID+1 },
 444   {"to-command", TO_COMMAND_OPTION, N_("COMMAND"), 0,
 445    N_("pipe extracted files to another program"), GRID+1 },
 446   {"ignore-command-error", IGNORE_COMMAND_ERROR_OPTION, 0, 0,
 447    N_("ignore exit codes of children"), GRID+1 },
 448   {"no-ignore-command-error", NO_IGNORE_COMMAND_ERROR_OPTION, 0, 0,
 449    N_("treat non-zero exit codes of children as error"), GRID+1 },
 450 #undef GRID
 451
 452 #define GRID 50
 453   {NULL, 0, NULL, 0,
 454    N_("Handling of file attributes:"), GRID },
 455
 456   {"owner", OWNER_OPTION, N_("NAME"), 0,
 457    N_("force NAME as owner for added files"), GRID+1 },
 458   {"group", GROUP_OPTION, N_("NAME"), 0,
 459    N_("force NAME as group for added files"), GRID+1 },
 460   {"mtime", MTIME_OPTION, N_("DATE-OR-FILE"), 0,
 461    N_("set mtime for added files from DATE-OR-FILE"), GRID+1 },
 462   {"mode", MODE_OPTION, N_("CHANGES"), 0,
 463    N_("force (symbolic) mode CHANGES for added files"), GRID+1 },
 464   {"atime-preserve", ATIME_PRESERVE_OPTION,
 465    N_("METHOD"), OPTION_ARG_OPTIONAL,
 466    N_("preserve access times on dumped files, either by restoring the times"
 467       " after reading (METHOD='replace'; default) or by not setting the times"
 468       " in the first place (METHOD='system')"), GRID+1 },
 469   {"touch", 'm', 0, 0,
 470    N_("don't extract file modified time"), GRID+1 },
 471   {"same-owner", SAME_OWNER_OPTION, 0, 0,
 472    N_("try extracting files with the same ownership"), GRID+1 },
 473   {"no-same-owner", NO_SAME_OWNER_OPTION, 0, 0,
 474    N_("extract files as yourself"), GRID+1 },
 475   {"numeric-owner", NUMERIC_OWNER_OPTION, 0, 0,
 476    N_("always use numbers for user/group names"), GRID+1 },
 477   {"preserve-permissions", 'p', 0, 0,
 478    N_("extract information about file permissions (default for superuser)"),
 479    GRID+1 },
 480   {"same-permissions", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 481   {"no-same-permissions", NO_SAME_PERMISSIONS_OPTION, 0, 0,
 482    N_("apply the user's umask when extracting permissions from the archive (default for ordinary users)"), GRID+1 },
 483   {"preserve-order", 's', 0, 0,
 484    N_("sort names to extract to match archive"), GRID+1 },
 485   {"same-order", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 486   {"preserve", PRESERVE_OPTION, 0, 0,
 487    N_("same as both -p and -s"), GRID+1 },
 488   {"delay-directory-restore", DELAY_DIRECTORY_RESTORE_OPTION, 0, 0,
 489    N_("delay setting modification times and permissions of extracted"
 490       " directories until the end of extraction"), GRID+1 },
 491   {"no-delay-directory-restore", NO_DELAY_DIRECTORY_RESTORE_OPTION, 0, 0,
 492    N_("cancel the effect of --delay-directory-restore option"), GRID+1 },
 493 #undef GRID
 494
 495 #define GRID 60
 496   {NULL, 0, NULL, 0,
 497    N_("Device selection and switching:"), GRID },
 498
 499   {"file", 'f', N_("ARCHIVE"), 0,
 500    N_("use archive file or device ARCHIVE"), GRID+1 },
 501   {"force-local", FORCE_LOCAL_OPTION, 0, 0,
 502    N_("archive file is local even if it has a colon"), GRID+1 },
 503   {"rmt-command", RMT_COMMAND_OPTION, N_("COMMAND"), 0,
 504    N_("use given rmt COMMAND instead of rmt"), GRID+1 },
 505   {"rsh-command", RSH_COMMAND_OPTION, N_("COMMAND"), 0,
 506    N_("use remote COMMAND instead of rsh"), GRID+1 },
 507 #ifdef DEVICE_PREFIX
 508   {"-[0-7][lmh]", 0, NULL, OPTION_DOC, /* It is OK, since `name' will never be
 509                                           translated */
 510    N_("specify drive and density"), GRID+1 },
 511 #endif
 512   {NULL, '0', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 513   {NULL, '1', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 514   {NULL, '2', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 515   {NULL, '3', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 516   {NULL, '4', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 517   {NULL, '5', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 518   {NULL, '6', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 519   {NULL, '7', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 520   {NULL, '8', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 521   {NULL, '9', NULL, OPTION_HIDDEN, NULL, GRID+1 },
 522
 523   {"multi-volume", 'M', 0, 0,
 524    N_("create/list/extract multi-volume archive"), GRID+1 },
 525   {"tape-length", 'L', N_("NUMBER"), 0,
 526    N_("change tape after writing NUMBER x 1024 bytes"), GRID+1 },
 527   {"info-script", 'F', N_("NAME"), 0,
 528    N_("run script at end of each tape (implies -M)"), GRID+1 },
 529   {"new-volume-script", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 530   {"volno-file", VOLNO_FILE_OPTION, N_("FILE"), 0,
 531    N_("use/update the volume number in FILE"), GRID+1 },
 532 #undef GRID
 533
 534 #define GRID 70
 535   {NULL, 0, NULL, 0,
 536    N_("Device blocking:"), GRID },
 537
 538   {"blocking-factor", 'b', N_("BLOCKS"), 0,
 539    N_("BLOCKS x 512 bytes per record"), GRID+1 },
 540   {"record-size", RECORD_SIZE_OPTION, N_("NUMBER"), 0,
 541    N_("NUMBER of bytes per record, multiple of 512"), GRID+1 },
 542   {"ignore-zeros", 'i', 0, 0,
 543    N_("ignore zeroed blocks in archive (means EOF)"), GRID+1 },
 544   {"read-full-records", 'B', 0, 0,
 545    N_("reblock as we read (for 4.2BSD pipes)"), GRID+1 },
 546 #undef GRID
 547
 548 #define GRID 80
 549   {NULL, 0, NULL, 0,
 550    N_("Archive format selection:"), GRID },
 551
 552   {"format", 'H', N_("FORMAT"), 0,
 553    N_("create archive of the given format"), GRID+1 },
 554
 555   {NULL, 0, NULL, 0, N_("FORMAT is one of the following:"), GRID+2 },
 556   {"  v7", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("old V7 tar format"),
 557    GRID+3 },
 558   {"  oldgnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 559    N_("GNU format as per tar <= 1.12"), GRID+3 },
 560   {"  gnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 561    N_("GNU tar 1.13.x format"), GRID+3 },
 562   {"  ustar", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 563    N_("POSIX 1003.1-1988 (ustar) format"), GRID+3 },
 564   {"  pax", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
 565    N_("POSIX 1003.1-2001 (pax) format"), GRID+3 },
 566   {"  posix", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("same as pax"), GRID+3 },
 567
 568   {"old-archive", OLD_ARCHIVE_OPTION, 0, 0, /* FIXME */
 569    N_("same as --format=v7"), GRID+8 },
 570   {"portability", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 571   {"posix", POSIX_OPTION, 0, 0,
 572    N_("same as --format=posix"), GRID+8 },
 573   {"pax-option", PAX_OPTION, N_("keyword[[:]=value][,keyword[[:]=value]]..."), 0,
 574    N_("control pax keywords"), GRID+8 },
 575   {"label", 'V', N_("TEXT"), 0,
 576    N_("create archive with volume name TEXT; at list/extract time, use TEXT as a globbing pattern for volume name"), GRID+8 },
 577   {"bzip2", 'j', 0, 0,
 578    N_("filter the archive through bzip2"), GRID+8 },
 579   {"gzip", 'z', 0, 0,
 580    N_("filter the archive through gzip"), GRID+8 },
 581   {"gunzip", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 582   {"ungzip", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 583   {"compress", 'Z', 0, 0,
 584    N_("filter the archive through compress"), GRID+8 },
 585   {"uncompress", 0, 0, OPTION_ALIAS, NULL, GRID+8 },
 586   {"use-compress-program", USE_COMPRESS_PROGRAM_OPTION, N_("PROG"), 0,
 587    N_("filter through PROG (must accept -d)"), GRID+8 },
 588 #undef GRID
 589
 590 #define GRID 90
 591   {NULL, 0, NULL, 0,
 592    N_("Local file selection:"), GRID },
 593
 594   {"add-file", ARGP_KEY_ARG, N_("FILE"), 0,
 595    N_("add given FILE to the archive (useful if its name starts with a dash)"), GRID+1 },
 596   {"directory", 'C', N_("DIR"), 0,
 597    N_("change to directory DIR"), GRID+1 },
 598   {"files-from", 'T', N_("FILE"), 0,
 599    N_("get names to extract or create from FILE"), GRID+1 },
 600   {"null", NULL_OPTION, 0, 0,
 601    N_("-T reads null-terminated names, disable -C"), GRID+1 },
 602   {"unquote", UNQUOTE_OPTION, 0, 0,
 603    N_("unquote filenames read with -T (default)"), GRID+1 },
 604   {"no-unquote", NO_UNQUOTE_OPTION, 0, 0,
 605    N_("do not unquote filenames read with -T"), GRID+1 },
 606   {"exclude", EXCLUDE_OPTION, N_("PATTERN"), 0,
 607    N_("exclude files, given as a PATTERN"), GRID+1 },
 608   {"exclude-from", 'X', N_("FILE"), 0,
 609    N_("exclude patterns listed in FILE"), GRID+1 },
 610   {"exclude-caches", EXCLUDE_CACHES_OPTION, 0, 0,
 611    N_("exclude contents of directories containing CACHEDIR.TAG, "
 612       "except for the tag file itself"), GRID+1 },
 613   {"exclude-caches-under", EXCLUDE_CACHES_UNDER_OPTION, 0, 0,
 614    N_("exclude everything under directories containing CACHEDIR.TAG"),
 615    GRID+1 },
 616   {"exclude-caches-all", EXCLUDE_CACHES_ALL_OPTION, 0, 0,
 617    N_("exclude directories containing CACHEDIR.TAG"), GRID+1 },
 618   {"exclude-tag", EXCLUDE_TAG_OPTION, N_("FILE"), 0,
 619    N_("exclude contents of directories containing FILE, except"
 620       " for FILE itself"), GRID+1 },
 621   {"exclude-tag-under", EXCLUDE_TAG_UNDER_OPTION, N_("FILE"), 0,
 622    N_("exclude everything under directories containing FILE"), GRID+1 },
 623   {"exclude-tag-all", EXCLUDE_TAG_ALL_OPTION, N_("FILE"), 0,
 624    N_("exclude directories containing FILE"), GRID+1 },
 625   {"no-recursion", NO_RECURSION_OPTION, 0, 0,
 626    N_("avoid descending automatically in directories"), GRID+1 },
 627   {"one-file-system", ONE_FILE_SYSTEM_OPTION, 0, 0,
 628    N_("stay in local file system when creating archive"), GRID+1 },
 629   {"recursion", RECURSION_OPTION, 0, 0,
 630    N_("recurse into directories (default)"), GRID+1 },
 631   {"absolute-names", 'P', 0, 0,
 632    N_("don't strip leading `/'s from file names"), GRID+1 },
 633   {"dereference", 'h', 0, 0,
 634    N_("follow symlinks; archive and dump the files they point to"), GRID+1 },
 635   {"starting-file", 'K', N_("MEMBER-NAME"), 0,
 636    N_("begin at member MEMBER-NAME in the archive"), GRID+1 },
 637   {"newer", 'N', N_("DATE-OR-FILE"), 0,
 638    N_("only store files newer than DATE-OR-FILE"), GRID+1 },
 639   {"after-date", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 640   {"newer-mtime", NEWER_MTIME_OPTION, N_("DATE"), 0,
 641    N_("compare date and time when data changed only"), GRID+1 },
 642   {"backup", BACKUP_OPTION, N_("CONTROL"), OPTION_ARG_OPTIONAL,
 643    N_("backup before removal, choose version CONTROL"), GRID+1 },
 644   {"suffix", SUFFIX_OPTION, N_("STRING"), 0,
 645    N_("backup before removal, override usual suffix ('~' unless overridden by environment variable SIMPLE_BACKUP_SUFFIX)"), GRID+1 },
 646 #undef GRID
 647
 648 #define GRID 92
 649   {NULL, 0, NULL, 0,
 650    N_("File name transformations:"), GRID },
 651   {"strip-components", STRIP_COMPONENTS_OPTION, N_("NUMBER"), 0,
 652    N_("strip NUMBER leading components from file names on extraction"),
 653    GRID+1 },
 654   {"transform", TRANSFORM_OPTION, N_("EXPRESSION"), 0,
 655    N_("use sed replace EXPRESSION to transform file names"), GRID+1 },
 656 #undef GRID
 657
 658 #define GRID 95
 659   {NULL, 0, NULL, 0,
 660    N_("File name matching options (affect both exclude and include patterns):"),
 661    GRID },
 662   {"ignore-case", IGNORE_CASE_OPTION, 0, 0,
 663    N_("ignore case"), GRID+1 },
 664   {"anchored", ANCHORED_OPTION, 0, 0,
 665    N_("patterns match file name start"), GRID+1 },
 666   {"no-anchored", NO_ANCHORED_OPTION, 0, 0,
 667    N_("patterns match after any `/' (default for exclusion)"), GRID+1 },
 668   {"no-ignore-case", NO_IGNORE_CASE_OPTION, 0, 0,
 669    N_("case sensitive matching (default)"), GRID+1 },
 670   {"wildcards", WILDCARDS_OPTION, 0, 0,
 671    N_("use wildcards (default for exclusion)"), GRID+1 },
 672   {"no-wildcards", NO_WILDCARDS_OPTION, 0, 0,
 673    N_("verbatim string matching"), GRID+1 },
 674   {"no-wildcards-match-slash", NO_WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
 675    N_("wildcards do not match `/'"), GRID+1 },
 676   {"wildcards-match-slash", WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
 677    N_("wildcards match `/' (default for exclusion)"), GRID+1 },
 678 #undef GRID
 679
 680 #define GRID 100
 681   {NULL, 0, NULL, 0,
 682    N_("Informative output:"), GRID },
 683
 684   {"verbose", 'v', 0, 0,
 685    N_("verbosely list files processed"), GRID+1 },
 686   {"checkpoint", CHECKPOINT_OPTION, N_("[.]NUMBER"), OPTION_ARG_OPTIONAL,
 687    N_("display progress messages every NUMBERth record (default 10)"),
 688    GRID+1 },
 689   {"check-links", 'l', 0, 0,
 690    N_("print a message if not all links are dumped"), GRID+1 },
 691   {"totals", TOTALS_OPTION, N_("SIGNAL"), OPTION_ARG_OPTIONAL,
 692    N_("print total bytes after processing the archive; "
 693       "with an argument - print total bytes when this SIGNAL is delivered; "
 694       "Allowed signals are: SIGHUP, SIGQUIT, SIGINT, SIGUSR1 and SIGUSR2; "
 695       "the names without SIG prefix are also accepted"), GRID+1 },
 696   {"utc", UTC_OPTION, 0, 0,
 697    N_("print file modification dates in UTC"), GRID+1 },
 698   {"index-file", INDEX_FILE_OPTION, N_("FILE"), 0,
 699    N_("send verbose output to FILE"), GRID+1 },
 700   {"block-number", 'R', 0, 0,
 701    N_("show block number within archive with each message"), GRID+1 },
 702   {"interactive", 'w', 0, 0,
 703    N_("ask for confirmation for every action"), GRID+1 },
 704   {"confirmation", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 705   {"show-defaults", SHOW_DEFAULTS_OPTION, 0, 0,
 706    N_("show tar defaults"), GRID+1 },
 707   {"show-omitted-dirs", SHOW_OMITTED_DIRS_OPTION, 0, 0,
 708    N_("when listing or extracting, list each directory that does not match search criteria"), GRID+1 },
 709   {"show-transformed-names", SHOW_TRANSFORMED_NAMES_OPTION, 0, 0,
 710    N_("show file or archive names after transformation"),
 711    GRID+1 },
 712   {"show-stored-names", 0, 0, OPTION_ALIAS, NULL, GRID+1 },
 713   {"quoting-style", QUOTING_STYLE_OPTION, N_("STYLE"), 0,
 714    N_("set name quoting style; see below for valid STYLE values"), GRID+1 },
 715   {"quote-chars", QUOTE_CHARS_OPTION, N_("STRING"), 0,
 716    N_("additionally quote characters from STRING"), GRID+1 },
 717   {"no-quote-chars", NO_QUOTE_CHARS_OPTION, N_("STRING"), 0,
 718    N_("disable quoting for characters from STRING"), GRID+1 },
 719 #undef GRID
 720
 721 #define GRID 110
 722   {NULL, 0, NULL, 0,
 723    N_("Compatibility options:"), GRID },
 724
 725   {NULL, 'o', 0, 0,
 726    N_("when creating, same as --old-archive; when extracting, same as --no-same-owner"), GRID+1 },
 727 #undef GRID
 728
 729 #define GRID 120
 730   {NULL, 0, NULL, 0,
 731    N_("Other options:"), GRID },
 732
 733   {"restrict", RESTRICT_OPTION, 0, 0,
 734    N_("disable use of some potentially harmful options"), -1 },
 735
 736   {"help",  '?', 0, 0,  N_("give this help list"), -1},
 737   {"usage", USAGE_OPTION, 0, 0,  N_("give a short usage message"), -1},
 738   {"version", VERSION_OPTION, 0, 0,  N_("print program version"), -1},
 739   /* FIXME -V (--label) conflicts with the default short option for
 740      --version */
 741   {"HANG",        HANG_OPTION,    "SECS", OPTION_ARG_OPTIONAL | OPTION_HIDDEN,
 742    N_("hang for SECS seconds (default 3600)"), 0},
 743 #undef GRID
 744
 745   {0, 0, 0, 0, 0, 0}
 746 };
 747
 748 static char const *const atime_preserve_args[] =
 749 {
 750   "replace", "system", NULL
 751 };
 752
 753 static enum atime_preserve const atime_preserve_types[] =
 754 {
 755   replace_atime_preserve, system_atime_preserve
 756 };
 757
 758 /* Make sure atime_preserve_types has as much entries as atime_preserve_args
 759    (minus 1 for NULL guard) */
 760 ARGMATCH_VERIFY (atime_preserve_args, atime_preserve_types);
 761
 762 /* Wildcard matching settings */
 763 enum wildcards
 764   {
 765     default_wildcards, /* For exclusion == enable_wildcards,
 766                           for inclusion == disable_wildcards */
 767     disable_wildcards,
 768     enable_wildcards
 769   };
 770
 771 struct tar_args        /* Variables used during option parsing */
 772 {
 773   struct textual_date *textual_date; /* Keeps the arguments to --newer-mtime
 774                                         and/or --date option if they are
 775                                         textual dates */
 776   enum wildcards wildcards;        /* Wildcard settings (--wildcards/
 777                                       --no-wildcards) */
 778   int matching_flags;              /* exclude_fnmatch options */
 779   int include_anchored;            /* Pattern anchoring options used for
 780                                       file inclusion */
 781   bool o_option;                   /* True if -o option was given */
 782   bool pax_option;                 /* True if --pax-option was given */
 783   char const *backup_suffix_string;   /* --suffix option argument */
 784   char const *version_control_string; /* --backup option argument */
 785   bool input_files;                /* True if some input files where given */
 786 };
 787
 788 #define MAKE_EXCL_OPTIONS(args) \
 789  ((((args)->wildcards != disable_wildcards) ? EXCLUDE_WILDCARDS : 0) \
 790   | (args)->matching_flags \
 791   | recursion_option)
 792
 793 #define MAKE_INCL_OPTIONS(args) \
 794  ((((args)->wildcards == enable_wildcards) ? EXCLUDE_WILDCARDS : 0) \
 795   | (args)->include_anchored \
 796   | (args)->matching_flags \
 797   | recursion_option)
 798
 799 #ifdef REMOTE_SHELL
 800 # define DECL_SHOW_DEFAULT_SETTINGS(stream, printer)                      \
 801 {                                                                         \
 802   printer (stream,                                                        \
 803            "--format=%s -f%s -b%d --quoting-style=%s --rmt-command=%s",   \
 804            archive_format_string (DEFAULT_ARCHIVE_FORMAT),                \
 805            DEFAULT_ARCHIVE, DEFAULT_BLOCKING,                             \
 806            quoting_style_args[DEFAULT_QUOTING_STYLE],                     \
 807            DEFAULT_RMT_COMMAND);                                          \
 808   printer (stream, " --rsh-command=%s", REMOTE_SHELL);                    \
 809   printer (stream, "\n");                                                 \
 810 }
 811 #else
 812 # define DECL_SHOW_DEFAULT_SETTINGS(stream, printer)                      \
 813 {                                                                         \
 814   printer (stream,                                                        \
 815            "--format=%s -f%s -b%d --quoting-style=%s --rmt-command=%s",   \
 816            archive_format_string (DEFAULT_ARCHIVE_FORMAT),                \
 817            DEFAULT_ARCHIVE, DEFAULT_BLOCKING,                             \
 818            quoting_style_args[DEFAULT_QUOTING_STYLE],                     \
 819            DEFAULT_RMT_COMMAND);                                          \
 820   printer (stream, "\n");                                                 \
 821 }
 822 #endif
 823
 824 static void
 825 show_default_settings (FILE *fp)
 826      DECL_SHOW_DEFAULT_SETTINGS(fp, fprintf)
 827
 828 static void
 829 show_default_settings_fs (argp_fmtstream_t fs)
 830      DECL_SHOW_DEFAULT_SETTINGS(fs, argp_fmtstream_printf)
 831
 832 static void
 833 set_subcommand_option (enum subcommand subcommand)
 834 {
 835   if (subcommand_option != UNKNOWN_SUBCOMMAND
 836       && subcommand_option != subcommand)
 837     USAGE_ERROR ((0, 0,
 838                   _("You may not specify more than one `-Acdtrux' option")));
 839
 840   subcommand_option = subcommand;
 841 }
 842
 843 static void
 844 set_use_compress_program_option (const char *string)
 845 {
 846   if (use_compress_program_option
 847       && strcmp (use_compress_program_option, string) != 0)
 848     USAGE_ERROR ((0, 0, _("Conflicting compression options")));
 849
 850   use_compress_program_option = string;
 851 }
 852 \f
 853 static RETSIGTYPE
 854 sigstat (int signo)
 855 {
 856   compute_duration ();
 857   print_total_stats ();
 858 #ifndef HAVE_SIGACTION
 859   signal (signo, sigstat);
 860 #endif
 861 }
 862
 863 static void
 864 stat_on_signal (int signo)
 865 {
 866 #ifdef HAVE_SIGACTION
 867   struct sigaction act;
 868   act.sa_handler = sigstat;
 869   sigemptyset (&act.sa_mask);
 870   act.sa_flags = 0;
 871   sigaction (signo, &act, NULL);
 872 #else
 873   signal (signo, sigstat);
 874 #endif
 875 }
 876
 877 void
 878 set_stat_signal (const char *name)
 879 {
 880   static struct sigtab
 881   {
 882     char *name;
 883     int signo;
 884   } sigtab[] = {
 885     { "SIGUSR1", SIGUSR1 },
 886     { "USR1", SIGUSR1 },
 887     { "SIGUSR2", SIGUSR2 },
 888     { "USR2", SIGUSR2 },
 889     { "SIGHUP", SIGHUP },
 890     { "HUP", SIGHUP },
 891     { "SIGINT", SIGINT },
 892     { "INT", SIGINT },
 893     { "SIGQUIT", SIGQUIT },
 894     { "QUIT", SIGQUIT }
 895   };
 896   struct sigtab *p;
 897
 898   for (p = sigtab; p < sigtab + sizeof (sigtab) / sizeof (sigtab[0]); p++)
 899     if (strcmp (p->name, name) == 0)
 900       {
 901         stat_on_signal (p->signo);
 902         return;
 903       }
 904   FATAL_ERROR ((0, 0, _("Unknown signal name: %s"), name));
 905 }
 906
 907 \f
 908 struct textual_date
 909 {
 910   struct textual_date *next;
 911   struct timespec *ts;
 912   const char *option;
 913   const char *date;
 914 };
 915
 916 static void
 917 get_date_or_file (struct tar_args *args, const char *option,
 918                   const char *str, struct timespec *ts)
 919 {
 920   if (FILE_SYSTEM_PREFIX_LEN (str) != 0
 921       || ISSLASH (*str)
 922       || *str == '.')
 923     {
 924       struct stat st;
 925       if (deref_stat (dereference_option, str, &st) != 0)
 926         {
 927           stat_error (str);
 928           USAGE_ERROR ((0, 0, _("Date sample file not found")));
 929         }
 930       *ts = get_stat_mtime (&st);
 931     }
 932   else
 933     {
 934       if (! get_date (ts, str, NULL))
 935         {
 936           WARN ((0, 0, _("Substituting %s for unknown date format %s"),
 937                  tartime (*ts, false), quote (str)));
 938           ts->tv_nsec = 0;
 939         }
 940       else
 941         {
 942           struct textual_date *p = xmalloc (sizeof (*p));
 943           p->ts = ts;
 944           p->option = option;
 945           p->date = str;
 946           p->next = args->textual_date;
 947           args->textual_date = p;
 948         }
 949     }
 950 }
 951
 952 static void
 953 report_textual_dates (struct tar_args *args)
 954 {
 955   struct textual_date *p;
 956   for (p = args->textual_date; p; )
 957     {
 958       struct textual_date *next = p->next;
 959       char const *treated_as = tartime (*p->ts, true);
 960       if (strcmp (p->date, treated_as) != 0)
 961         WARN ((0, 0, _("Option %s: Treating date `%s' as %s"),
 962                p->option, p->date, treated_as));
 963       free (p);
 964       p = next;
 965     }
 966 }
 967
 968 \f
 969 static volatile int _argp_hang;
 970
 971 enum read_file_list_state  /* Result of reading file name from the list file */
 972   {
 973     file_list_success,     /* OK, name read successfully */
 974     file_list_end,         /* End of list file */
 975     file_list_zero,        /* Zero separator encountered where it should not */
 976     file_list_skip         /* Empty (zero-length) entry encountered, skip it */
 977   };
 978
 979 /* Read from FP a sequence of characters up to FILENAME_TERMINATOR and put them
 980    into STK.
 981  */
 982 static enum read_file_list_state
 983 read_name_from_file (FILE *fp, struct obstack *stk)
 984 {
 985   int c;
 986   size_t counter = 0;
 987
 988   for (c = getc (fp); c != EOF && c != filename_terminator; c = getc (fp))
 989     {
 990       if (c == 0)
 991         {
 992           /* We have read a zero separator. The file possibly is
 993              zero-separated */
 994           return file_list_zero;
 995         }
 996       obstack_1grow (stk, c);
 997       counter++;
 998     }
 999
1000   if (counter == 0 && c != EOF)
1001     return file_list_skip;
1002
1003   obstack_1grow (stk, 0);
1004
1005   return (counter == 0 && c == EOF) ? file_list_end : file_list_success;
1006 }
1007
1008 \f
1009 static bool files_from_option;  /* When set, tar will not refuse to create
1010                                    empty archives */
1011 static struct obstack argv_stk; /* Storage for additional command line options
1012                                    read using -T option */
1013
1014 /* Prevent recursive inclusion of the same file */
1015 struct file_id_list
1016 {
1017   struct file_id_list *next;
1018   ino_t ino;
1019   dev_t dev;
1020 };
1021
1022 static struct file_id_list *file_id_list;
1023
1024 static void
1025 add_file_id (const char *filename)
1026 {
1027   struct file_id_list *p;
1028   struct stat st;
1029
1030   if (stat (filename, &st))
1031     stat_fatal (filename);
1032   for (p = file_id_list; p; p = p->next)
1033     if (p->ino == st.st_ino && p->dev == st.st_dev)
1034       {
1035         FATAL_ERROR ((0, 0, _("%s: file list already read"),
1036                       quotearg_colon (filename)));
1037       }
1038   p = xmalloc (sizeof *p);
1039   p->next = file_id_list;
1040   p->ino = st.st_ino;
1041   p->dev = st.st_dev;
1042   file_id_list = p;
1043 }
1044
1045 /* Default density numbers for [0-9][lmh] device specifications */
1046
1047 #ifndef LOW_DENSITY_NUM
1048 # define LOW_DENSITY_NUM 0
1049 #endif
1050
1051 #ifndef MID_DENSITY_NUM
1052 # define MID_DENSITY_NUM 8
1053 #endif
1054
1055 #ifndef HIGH_DENSITY_NUM
1056 # define HIGH_DENSITY_NUM 16
1057 #endif
1058
1059 static void
1060 update_argv (const char *filename, struct argp_state *state)
1061 {
1062   FILE *fp;
1063   size_t count = 0, i;
1064   char *start, *p;
1065   char **new_argv;
1066   size_t new_argc;
1067   bool is_stdin = false;
1068   enum read_file_list_state read_state;
1069
1070   if (!strcmp (filename, "-"))
1071     {
1072       is_stdin = true;
1073       request_stdin ("-T");
1074       fp = stdin;
1075     }
1076   else
1077     {
1078       add_file_id (filename);
1079       if ((fp = fopen (filename, "r")) == NULL)
1080         open_fatal (filename);
1081     }
1082
1083   while ((read_state = read_name_from_file (fp, &argv_stk)) != file_list_end)
1084     {
1085       switch (read_state)
1086         {
1087         case file_list_success:
1088           count++;
1089           break;
1090
1091         case file_list_end: /* won't happen, just to pacify gcc */
1092           break;
1093
1094         case file_list_zero:
1095           {
1096             size_t size;
1097
1098             WARN ((0, 0, N_("%s: file name read contains nul character"),
1099                    quotearg_colon (filename)));
1100
1101             /* Prepare new stack contents */
1102             size = obstack_object_size (&argv_stk);
1103             p = obstack_finish (&argv_stk);
1104             for (; size > 0; size--, p++)
1105               if (*p)
1106                 obstack_1grow (&argv_stk, *p);
1107               else
1108                 obstack_1grow (&argv_stk, '\n');
1109             obstack_1grow (&argv_stk, 0);
1110             count = 1;
1111             /* Read rest of files using new filename terminator */
1112             filename_terminator = 0;
1113             break;
1114           }
1115
1116         case file_list_skip:
1117           break;
1118         }
1119     }
1120
1121   if (!is_stdin)
1122     fclose (fp);
1123
1124   if (count == 0)
1125     return;
1126
1127   start = obstack_finish (&argv_stk);
1128
1129   if (filename_terminator == 0)
1130     for (p = start; *p; p += strlen (p) + 1)
1131       if (p[0] == '-')
1132         count++;
1133
1134   new_argc = state->argc + count;
1135   new_argv = xmalloc (sizeof (state->argv[0]) * (new_argc + 1));
1136   memcpy (new_argv, state->argv, sizeof (state->argv[0]) * (state->argc + 1));
1137   state->argv = new_argv;
1138   memmove (&state->argv[state->next + count], &state->argv[state->next],
1139            (state->argc - state->next + 1) * sizeof (state->argv[0]));
1140
1141   state->argc = new_argc;
1142
1143   for (i = state->next, p = start; *p; p += strlen (p) + 1, i++)
1144     {
1145       if (filename_terminator == 0 && p[0] == '-')
1146         state->argv[i++] = "--add-file";
1147       state->argv[i] = p;
1148     }
1149 }
1150
1151 \f
1152 static void
1153 tar_help (struct argp_state *state)
1154 {
1155   argp_fmtstream_t fs;
1156   state->flags |= ARGP_NO_EXIT;
1157   argp_state_help (state, state->out_stream,
1158                    ARGP_HELP_STD_HELP & ~ARGP_HELP_BUG_ADDR);
1159   /* FIXME: use struct uparams.rmargin (from argp-help.c) instead of 79 */
1160   fs = argp_make_fmtstream (state->out_stream, 0, 79, 0);
1161
1162   argp_fmtstream_printf (fs, "\n%s\n\n",
1163                        _("Valid arguments for --quoting-style options are:"));
1164   tar_list_quoting_styles (fs, "  ");
1165
1166   argp_fmtstream_puts (fs, _("\n*This* tar defaults to:\n"));
1167   show_default_settings_fs (fs);
1168   argp_fmtstream_putc (fs, '\n');
1169   argp_fmtstream_printf (fs, _("Report bugs to %s.\n"),
1170                          argp_program_bug_address);
1171   argp_fmtstream_free (fs);
1172 }
1173 \f
1174 static error_t
1175 parse_opt (int key, char *arg, struct argp_state *state)
1176 {
1177   struct tar_args *args = state->input;
1178
1179   switch (key)
1180     {
1181     case ARGP_KEY_ARG:
1182       /* File name or non-parsed option, because of ARGP_IN_ORDER */
1183       name_add_name (arg, MAKE_INCL_OPTIONS (args));
1184       args->input_files = true;
1185       break;
1186
1187     case 'A':
1188       set_subcommand_option (CAT_SUBCOMMAND);
1189       break;
1190
1191     case 'b':
1192       {
1193         uintmax_t u;
1194         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1195                && u == (blocking_factor = u)
1196                && 0 < blocking_factor
1197                && u == (record_size = u * BLOCKSIZE) / BLOCKSIZE))
1198           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1199                         _("Invalid blocking factor")));
1200       }
1201       break;
1202
1203     case 'B':
1204       /* Try to reblock input records.  For reading 4.2BSD pipes.  */
1205
1206       /* It would surely make sense to exchange -B and -R, but it seems
1207          that -B has been used for a long while in Sun tar and most
1208          BSD-derived systems.  This is a consequence of the block/record
1209          terminology confusion.  */
1210
1211       read_full_records_option = true;
1212       break;
1213
1214     case 'c':
1215       set_subcommand_option (CREATE_SUBCOMMAND);
1216       break;
1217
1218     case 'C':
1219       name_add_dir (arg);
1220       break;
1221
1222     case 'd':
1223       set_subcommand_option (DIFF_SUBCOMMAND);
1224       break;
1225
1226     case 'f':
1227       if (archive_names == allocated_archive_names)
1228         archive_name_array = x2nrealloc (archive_name_array,
1229                                          &allocated_archive_names,
1230                                          sizeof (archive_name_array[0]));
1231
1232       archive_name_array[archive_names++] = arg;
1233       break;
1234
1235     case 'F':
1236       /* Since -F is only useful with -M, make it implied.  Run this
1237          script at the end of each tape.  */
1238
1239       info_script_option = arg;
1240       multi_volume_option = true;
1241       break;
1242
1243     case 'g':
1244       listed_incremental_option = arg;
1245       after_date_option = true;
1246       /* Fall through.  */
1247
1248     case 'G':
1249       /* We are making an incremental dump (FIXME: are we?); save
1250          directories at the beginning of the archive, and include in each
1251          directory its contents.  */
1252
1253       incremental_option = true;
1254       break;
1255
1256     case 'h':
1257       /* Follow symbolic links.  */
1258       dereference_option = true;
1259       break;
1260
1261     case 'i':
1262       /* Ignore zero blocks (eofs).  This can't be the default,
1263          because Unix tar writes two blocks of zeros, then pads out
1264          the record with garbage.  */
1265
1266       ignore_zeros_option = true;
1267       break;
1268
1269     case 'I':
1270       USAGE_ERROR ((0, 0,
1271                     _("Warning: the -I option is not supported;"
1272                       " perhaps you meant -j or -T?")));
1273       break;
1274
1275     case 'j':
1276       set_use_compress_program_option ("bzip2");
1277       break;
1278
1279     case 'k':
1280       /* Don't replace existing files.  */
1281       old_files_option = KEEP_OLD_FILES;
1282       break;
1283
1284     case 'K':
1285       starting_file_option = true;
1286       addname (arg, 0);
1287       break;
1288
1289     case ONE_FILE_SYSTEM_OPTION:
1290       /* When dumping directories, don't dump files/subdirectories
1291          that are on other filesystems. */
1292       one_file_system_option = true;
1293       break;
1294
1295     case 'l':
1296       check_links_option = 1;
1297       break;
1298
1299     case 'L':
1300       {
1301         uintmax_t u;
1302         if (xstrtoumax (arg, 0, 10, &u, "") != LONGINT_OK)
1303           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1304                         _("Invalid tape length")));
1305         tape_length_option = 1024 * (tarlong) u;
1306         multi_volume_option = true;
1307       }
1308       break;
1309
1310     case 'm':
1311       touch_option = true;
1312       break;
1313
1314     case 'M':
1315       /* Make multivolume archive: when we can't write any more into
1316          the archive, re-open it, and continue writing.  */
1317
1318       multi_volume_option = true;
1319       break;
1320
1321     case MTIME_OPTION:
1322       get_date_or_file (args, "--mtime", arg, &mtime_option);
1323       set_mtime_option = true;
1324       break;
1325
1326     case 'n':
1327       seekable_archive = true;
1328       break;
1329
1330     case 'N':
1331       after_date_option = true;
1332       /* Fall through.  */
1333
1334     case NEWER_MTIME_OPTION:
1335       if (NEWER_OPTION_INITIALIZED (newer_mtime_option))
1336         USAGE_ERROR ((0, 0, _("More than one threshold date")));
1337       get_date_or_file (args,
1338                         key == NEWER_MTIME_OPTION ? "--newer-mtime"
1339                           : "--after-date", arg, &newer_mtime_option);
1340       break;
1341
1342     case 'o':
1343       args->o_option = true;
1344       break;
1345
1346     case 'O':
1347       to_stdout_option = true;
1348       break;
1349
1350     case 'p':
1351       same_permissions_option = true;
1352       break;
1353
1354     case 'P':
1355       absolute_names_option = true;
1356       break;
1357
1358     case 'r':
1359       set_subcommand_option (APPEND_SUBCOMMAND);
1360       break;
1361
1362     case 'R':
1363       /* Print block numbers for debugging bad tar archives.  */
1364
1365       /* It would surely make sense to exchange -B and -R, but it seems
1366          that -B has been used for a long while in Sun tar and most
1367          BSD-derived systems.  This is a consequence of the block/record
1368          terminology confusion.  */
1369
1370       block_number_option = true;
1371       break;
1372
1373     case 's':
1374       /* Names to extract are sorted.  */
1375
1376       same_order_option = true;
1377       break;
1378
1379     case 'S':
1380       sparse_option = true;
1381       break;
1382
1383     case SPARSE_VERSION_OPTION:
1384       sparse_option = true;
1385       {
1386         char *p;
1387         tar_sparse_major = strtoul (arg, &p, 10);
1388         if (*p)
1389           {
1390             if (*p != '.')
1391               USAGE_ERROR ((0, 0, _("Invalid sparse version value")));
1392             tar_sparse_minor = strtoul (p + 1, &p, 10);
1393             if (*p)
1394               USAGE_ERROR ((0, 0, _("Invalid sparse version value")));
1395           }
1396       }
1397       break;
1398
1399     case 't':
1400       set_subcommand_option (LIST_SUBCOMMAND);
1401       verbose_option++;
1402       break;
1403
1404     case TEST_LABEL_OPTION:
1405       set_subcommand_option (LIST_SUBCOMMAND);
1406       test_label_option = true;
1407       break;
1408
1409     case 'T':
1410       update_argv (arg, state);
1411       /* Indicate we've been given -T option. This is for backward
1412          compatibility only, so that `tar cfT archive /dev/null will
1413          succeed */
1414       files_from_option = true;
1415       break;
1416
1417     case 'u':
1418       set_subcommand_option (UPDATE_SUBCOMMAND);
1419       break;
1420
1421     case 'U':
1422       old_files_option = UNLINK_FIRST_OLD_FILES;
1423       break;
1424
1425     case UTC_OPTION:
1426       utc_option = true;
1427       break;
1428
1429     case 'v':
1430       verbose_option++;
1431       break;
1432
1433     case 'V':
1434       volume_label_option = arg;
1435       break;
1436
1437     case 'w':
1438       interactive_option = true;
1439       break;
1440
1441     case 'W':
1442       verify_option = true;
1443       break;
1444
1445     case 'x':
1446       set_subcommand_option (EXTRACT_SUBCOMMAND);
1447       break;
1448
1449     case 'X':
1450       if (add_exclude_file (add_exclude, excluded, arg,
1451                             MAKE_EXCL_OPTIONS (args), '\n')
1452           != 0)
1453         {
1454           int e = errno;
1455           FATAL_ERROR ((0, e, "%s", quotearg_colon (arg)));
1456         }
1457       break;
1458
1459     case 'z':
1460       set_use_compress_program_option ("gzip");
1461       break;
1462
1463     case 'Z':
1464       set_use_compress_program_option ("compress");
1465       break;
1466
1467     case ANCHORED_OPTION:
1468       args->matching_flags |= EXCLUDE_ANCHORED;
1469       break;
1470
1471     case ATIME_PRESERVE_OPTION:
1472       atime_preserve_option =
1473         (arg
1474          ? XARGMATCH ("--atime-preserve", arg,
1475                       atime_preserve_args, atime_preserve_types)
1476          : replace_atime_preserve);
1477       if (! O_NOATIME && atime_preserve_option == system_atime_preserve)
1478         FATAL_ERROR ((0, 0,
1479                       _("--atime-preserve='system' is not supported"
1480                         " on this platform")));
1481       break;
1482
1483     case CHECKPOINT_OPTION:
1484       if (arg)
1485         {
1486           char *p;
1487
1488           if (*arg == '.')
1489             {
1490               checkpoint_style = checkpoint_dot;
1491               arg++;
1492             }
1493           checkpoint_option = strtoul (arg, &p, 0);
1494           if (*p)
1495             FATAL_ERROR ((0, 0,
1496                           _("--checkpoint value is not an integer")));
1497         }
1498       else
1499         checkpoint_option = 10;
1500       break;
1501
1502     case BACKUP_OPTION:
1503       backup_option = true;
1504       if (arg)
1505         args->version_control_string = arg;
1506       break;
1507
1508     case DELAY_DIRECTORY_RESTORE_OPTION:
1509       delay_directory_restore_option = true;
1510       break;
1511
1512     case NO_DELAY_DIRECTORY_RESTORE_OPTION:
1513       delay_directory_restore_option = false;
1514       break;
1515
1516     case DELETE_OPTION:
1517       set_subcommand_option (DELETE_SUBCOMMAND);
1518       break;
1519
1520     case EXCLUDE_OPTION:
1521       add_exclude (excluded, arg, MAKE_EXCL_OPTIONS (args));
1522       break;
1523
1524     case EXCLUDE_CACHES_OPTION:
1525       add_exclusion_tag ("CACHEDIR.TAG", exclusion_tag_contents,
1526                          cachedir_file_p);
1527       break;
1528
1529     case EXCLUDE_CACHES_UNDER_OPTION:
1530       add_exclusion_tag ("CACHEDIR.TAG", exclusion_tag_under,
1531                          cachedir_file_p);
1532       break;
1533
1534     case EXCLUDE_CACHES_ALL_OPTION:
1535       add_exclusion_tag ("CACHEDIR.TAG", exclusion_tag_all,
1536                          cachedir_file_p);
1537       break;
1538
1539     case EXCLUDE_TAG_OPTION:
1540       add_exclusion_tag (arg, exclusion_tag_contents, NULL);
1541       break;
1542
1543     case EXCLUDE_TAG_UNDER_OPTION:
1544       add_exclusion_tag (arg, exclusion_tag_under, NULL);
1545       break;
1546
1547     case EXCLUDE_TAG_ALL_OPTION:
1548       add_exclusion_tag (arg, exclusion_tag_all, NULL);
1549       break;
1550
1551     case FORCE_LOCAL_OPTION:
1552       force_local_option = true;
1553       break;
1554
1555     case 'H':
1556       set_archive_format (arg);
1557       break;
1558
1559     case INDEX_FILE_OPTION:
1560       index_file_name = arg;
1561       break;
1562
1563     case IGNORE_CASE_OPTION:
1564       args->matching_flags |= FNM_CASEFOLD;
1565       break;
1566
1567     case IGNORE_COMMAND_ERROR_OPTION:
1568       ignore_command_error_option = true;
1569       break;
1570
1571     case IGNORE_FAILED_READ_OPTION:
1572       ignore_failed_read_option = true;
1573       break;
1574
1575     case KEEP_NEWER_FILES_OPTION:
1576       old_files_option = KEEP_NEWER_FILES;
1577       break;
1578
1579     case GROUP_OPTION:
1580       if (! (strlen (arg) < GNAME_FIELD_SIZE
1581              && gname_to_gid (arg, &group_option)))
1582         {
1583           uintmax_t g;
1584           if (xstrtoumax (arg, 0, 10, &g, "") == LONGINT_OK
1585               && g == (gid_t) g)
1586             group_option = g;
1587           else
1588             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1589                           _("%s: Invalid group")));
1590         }
1591       break;
1592
1593     case MODE_OPTION:
1594       mode_option = mode_compile (arg);
1595       if (!mode_option)
1596         FATAL_ERROR ((0, 0, _("Invalid mode given on option")));
1597       initial_umask = umask (0);
1598       umask (initial_umask);
1599       break;
1600
1601     case NO_ANCHORED_OPTION:
1602       args->include_anchored = 0; /* Clear the default for comman line args */
1603       args->matching_flags &= ~ EXCLUDE_ANCHORED;
1604       break;
1605
1606     case NO_IGNORE_CASE_OPTION:
1607       args->matching_flags &= ~ FNM_CASEFOLD;
1608       break;
1609
1610     case NO_IGNORE_COMMAND_ERROR_OPTION:
1611       ignore_command_error_option = false;
1612       break;
1613
1614     case NO_OVERWRITE_DIR_OPTION:
1615       old_files_option = NO_OVERWRITE_DIR_OLD_FILES;
1616       break;
1617
1618     case NO_QUOTE_CHARS_OPTION:
1619       for (;*arg; arg++)
1620         set_char_quoting (NULL, *arg, 0);
1621       break;
1622
1623     case NO_WILDCARDS_OPTION:
1624       args->wildcards = disable_wildcards;
1625       break;
1626
1627     case NO_WILDCARDS_MATCH_SLASH_OPTION:
1628       args->matching_flags |= FNM_FILE_NAME;
1629       break;
1630
1631     case NULL_OPTION:
1632       filename_terminator = '\0';
1633       break;
1634
1635     case NUMERIC_OWNER_OPTION:
1636       numeric_owner_option = true;
1637       break;
1638
1639     case OCCURRENCE_OPTION:
1640       if (!arg)
1641         occurrence_option = 1;
1642       else
1643         {
1644           uintmax_t u;
1645           if (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK)
1646             occurrence_option = u;
1647           else
1648             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1649                           _("Invalid number")));
1650         }
1651       break;
1652
1653     case OVERWRITE_DIR_OPTION:
1654       old_files_option = DEFAULT_OLD_FILES;
1655       break;
1656
1657     case OVERWRITE_OPTION:
1658       old_files_option = OVERWRITE_OLD_FILES;
1659       break;
1660
1661     case OWNER_OPTION:
1662       if (! (strlen (arg) < UNAME_FIELD_SIZE
1663              && uname_to_uid (arg, &owner_option)))
1664         {
1665           uintmax_t u;
1666           if (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1667               && u == (uid_t) u)
1668             owner_option = u;
1669           else
1670             FATAL_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1671                           _("Invalid owner")));
1672         }
1673       break;
1674
1675     case QUOTE_CHARS_OPTION:
1676       for (;*arg; arg++)
1677         set_char_quoting (NULL, *arg, 1);
1678       break;
1679
1680     case QUOTING_STYLE_OPTION:
1681       tar_set_quoting_style (arg);
1682       break;
1683
1684     case PAX_OPTION:
1685       args->pax_option = true;
1686       xheader_set_option (arg);
1687       break;
1688
1689     case POSIX_OPTION:
1690       set_archive_format ("posix");
1691       break;
1692
1693     case PRESERVE_OPTION:
1694       /* FIXME: What it is good for? */
1695       same_permissions_option = true;
1696       same_order_option = true;
1697       break;
1698
1699     case RECORD_SIZE_OPTION:
1700       {
1701         uintmax_t u;
1702         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1703                && u == (size_t) u))
1704           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1705                         _("Invalid record size")));
1706         record_size = u;
1707         if (record_size % BLOCKSIZE != 0)
1708           USAGE_ERROR ((0, 0, _("Record size must be a multiple of %d."),
1709                         BLOCKSIZE));
1710         blocking_factor = record_size / BLOCKSIZE;
1711       }
1712       break;
1713
1714     case RECURSIVE_UNLINK_OPTION:
1715       recursive_unlink_option = true;
1716       break;
1717
1718     case REMOVE_FILES_OPTION:
1719       remove_files_option = true;
1720       break;
1721
1722     case RESTRICT_OPTION:
1723       restrict_option = true;
1724       break;
1725
1726     case RMT_COMMAND_OPTION:
1727       rmt_command = arg;
1728       break;
1729
1730     case RSH_COMMAND_OPTION:
1731       rsh_command_option = arg;
1732       break;
1733
1734     case SHOW_DEFAULTS_OPTION:
1735       show_default_settings (stdout);
1736       close_stdout ();
1737       exit (0);
1738
1739     case STRIP_COMPONENTS_OPTION:
1740       {
1741         uintmax_t u;
1742         if (! (xstrtoumax (arg, 0, 10, &u, "") == LONGINT_OK
1743                && u == (size_t) u))
1744           USAGE_ERROR ((0, 0, "%s: %s", quotearg_colon (arg),
1745                         _("Invalid number of elements")));
1746         strip_name_components = u;
1747       }
1748       break;
1749
1750     case SHOW_OMITTED_DIRS_OPTION:
1751       show_omitted_dirs_option = true;
1752       break;
1753
1754     case SHOW_TRANSFORMED_NAMES_OPTION:
1755       show_transformed_names_option = true;
1756       break;
1757
1758     case SUFFIX_OPTION:
1759       backup_option = true;
1760       args->backup_suffix_string = arg;
1761       break;
1762
1763     case TO_COMMAND_OPTION:
1764       if (to_command_option)
1765         USAGE_ERROR ((0, 0, _("Only one --to-command option allowed")));
1766       to_command_option = arg;
1767       break;
1768
1769     case TOTALS_OPTION:
1770       if (arg)
1771         set_stat_signal (arg);
1772       else
1773         totals_option = true;
1774       break;
1775
1776     case TRANSFORM_OPTION:
1777       set_transform_expr (arg);
1778       break;
1779
1780     case USE_COMPRESS_PROGRAM_OPTION:
1781       set_use_compress_program_option (arg);
1782       break;
1783
1784     case VOLNO_FILE_OPTION:
1785       volno_file_option = arg;
1786       break;
1787
1788     case WILDCARDS_OPTION:
1789       args->wildcards = enable_wildcards;
1790       break;
1791
1792     case WILDCARDS_MATCH_SLASH_OPTION:
1793       args->matching_flags &= ~ FNM_FILE_NAME;
1794       break;
1795
1796     case NO_RECURSION_OPTION:
1797       recursion_option = 0;
1798       break;
1799
1800     case NO_SAME_OWNER_OPTION:
1801       same_owner_option = -1;
1802       break;
1803
1804     case NO_SAME_PERMISSIONS_OPTION:
1805       same_permissions_option = -1;
1806       break;
1807
1808     case RECURSION_OPTION:
1809       recursion_option = FNM_LEADING_DIR;
1810       break;
1811
1812     case SAME_OWNER_OPTION:
1813       same_owner_option = 1;
1814       break;
1815
1816     case UNQUOTE_OPTION:
1817       unquote_option = true;
1818       break;
1819
1820     case NO_UNQUOTE_OPTION:
1821       unquote_option = false;
1822       break;
1823
1824     case '0':
1825     case '1':
1826     case '2':
1827     case '3':
1828     case '4':
1829     case '5':
1830     case '6':
1831     case '7':
1832
1833 #ifdef DEVICE_PREFIX
1834       {
1835         int device = key - '0';
1836         int density;
1837         static char buf[sizeof DEVICE_PREFIX + 10];
1838         char *cursor;
1839
1840         if (arg[1])
1841           argp_error (state, _("Malformed density argument: %s"), quote (arg));
1842
1843         strcpy (buf, DEVICE_PREFIX);
1844         cursor = buf + strlen (buf);
1845
1846 #ifdef DENSITY_LETTER
1847
1848         sprintf (cursor, "%d%c", device, arg[0]);
1849
1850 #else /* not DENSITY_LETTER */
1851
1852         switch (arg[0])
1853           {
1854           case 'l':
1855             device += LOW_DENSITY_NUM;
1856             break;
1857
1858           case 'm':
1859             device += MID_DENSITY_NUM;
1860             break;
1861
1862           case 'h':
1863             device += HIGH_DENSITY_NUM;
1864             break;
1865
1866           default:
1867             argp_error (state, _("Unknown density: `%c'"), arg[0]);
1868           }
1869         sprintf (cursor, "%d", device);
1870
1871 #endif /* not DENSITY_LETTER */
1872
1873         if (archive_names == allocated_archive_names)
1874           archive_name_array = x2nrealloc (archive_name_array,
1875                                            &allocated_archive_names,
1876                                            sizeof (archive_name_array[0]));
1877         archive_name_array[archive_names++] = xstrdup (buf);
1878       }
1879       break;
1880
1881 #else /* not DEVICE_PREFIX */
1882
1883       argp_error (state,
1884                   _("Options `-[0-7][lmh]' not supported by *this* tar"));
1885
1886 #endif /* not DEVICE_PREFIX */
1887
1888     case '?':
1889       tar_help (state);
1890       close_stdout ();
1891       exit (0);
1892
1893     case USAGE_OPTION:
1894       argp_state_help (state, state->out_stream, ARGP_HELP_USAGE);
1895       close_stdout ();
1896       exit (0);
1897
1898     case VERSION_OPTION:
1899       version_etc (state->out_stream, "tar", PACKAGE_NAME, VERSION,
1900                    "John Gilmore", "Jay Fenlason", (char *) NULL);
1901       close_stdout ();
1902       exit (0);
1903
1904     case HANG_OPTION:
1905       _argp_hang = atoi (arg ? arg : "3600");
1906       while (_argp_hang-- > 0)
1907         sleep (1);
1908       break;
1909
1910     default:
1911       return ARGP_ERR_UNKNOWN;
1912     }
1913   return 0;
1914 }
1915
1916 static struct argp argp = {
1917   options,
1918   parse_opt,
1919   N_("[FILE]..."),
1920   doc,
1921   NULL,
1922   NULL,
1923   NULL
1924 };
1925
1926 void
1927 usage (int status)
1928 {
1929   argp_help (&argp, stderr, ARGP_HELP_SEE, (char*) program_name);
1930   close_stdout ();
1931   exit (status);
1932 }
1933
1934 /* Parse the options for tar.  */
1935
1936 static struct argp_option *
1937 find_argp_option (struct argp_option *options, int letter)
1938 {
1939   for (;
1940        !(options->name == NULL
1941          && options->key == 0
1942          && options->arg == 0
1943          && options->flags == 0
1944          && options->doc == NULL); options++)
1945     if (options->key == letter)
1946       return options;
1947   return NULL;
1948 }
1949
1950 static void
1951 decode_options (int argc, char **argv)
1952 {
1953   int index;
1954   struct tar_args args;
1955
1956   /* Set some default option values.  */
1957   args.textual_date = NULL;
1958   args.wildcards = default_wildcards;
1959   args.matching_flags = 0;
1960   args.include_anchored = EXCLUDE_ANCHORED;
1961   args.o_option = false;
1962   args.pax_option = false;
1963   args.backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
1964   args.version_control_string = 0;
1965   args.input_files = false;
1966
1967   subcommand_option = UNKNOWN_SUBCOMMAND;
1968   archive_format = DEFAULT_FORMAT;
1969   blocking_factor = DEFAULT_BLOCKING;
1970   record_size = DEFAULT_BLOCKING * BLOCKSIZE;
1971   excluded = new_exclude ();
1972   newer_mtime_option.tv_sec = TYPE_MINIMUM (time_t);
1973   newer_mtime_option.tv_nsec = -1;
1974   recursion_option = FNM_LEADING_DIR;
1975   unquote_option = true;
1976   tar_sparse_major = 1;
1977   tar_sparse_minor = 0;
1978
1979   owner_option = -1;
1980   group_option = -1;
1981
1982   /* Convert old-style tar call by exploding option element and rearranging
1983      options accordingly.  */
1984
1985   if (argc > 1 && argv[1][0] != '-')
1986     {
1987       int new_argc;             /* argc value for rearranged arguments */
1988       char **new_argv;          /* argv value for rearranged arguments */
1989       char *const *in;          /* cursor into original argv */
1990       char **out;               /* cursor into rearranged argv */
1991       const char *letter;       /* cursor into old option letters */
1992       char buffer[3];           /* constructed option buffer */
1993
1994       /* Initialize a constructed option.  */
1995
1996       buffer[0] = '-';
1997       buffer[2] = '\0';
1998
1999       /* Allocate a new argument array, and copy program name in it.  */
2000
2001       new_argc = argc - 1 + strlen (argv[1]);
2002       new_argv = xmalloc ((new_argc + 1) * sizeof (char *));
2003       in = argv;
2004       out = new_argv;
2005       *out++ = *in++;
2006
2007       /* Copy each old letter option as a separate option, and have the
2008          corresponding argument moved next to it.  */
2009
2010       for (letter = *in++; *letter; letter++)
2011         {
2012           struct argp_option *opt;
2013
2014           buffer[1] = *letter;
2015           *out++ = xstrdup (buffer);
2016           opt = find_argp_option (options, *letter);
2017           if (opt && opt->arg)
2018             {
2019               if (in < argv + argc)
2020                 *out++ = *in++;
2021               else
2022                 USAGE_ERROR ((0, 0, _("Old option `%c' requires an argument."),
2023                               *letter));
2024             }
2025         }
2026
2027       /* Copy all remaining options.  */
2028
2029       while (in < argv + argc)
2030         *out++ = *in++;
2031       *out = 0;
2032
2033       /* Replace the old option list by the new one.  */
2034
2035       argc = new_argc;
2036       argv = new_argv;
2037     }
2038
2039   /* Parse all options and non-options as they appear.  */
2040
2041   prepend_default_options (getenv ("TAR_OPTIONS"), &argc, &argv);
2042
2043   if (argp_parse (&argp, argc, argv, ARGP_IN_ORDER|ARGP_NO_HELP,
2044                   &index, &args))
2045     exit (TAREXIT_FAILURE);
2046
2047
2048   /* Special handling for 'o' option:
2049
2050      GNU tar used to say "output old format".
2051      UNIX98 tar says don't chown files after extracting (we use
2052      "--no-same-owner" for this).
2053
2054      The old GNU tar semantics is retained when used with --create
2055      option, otherwise UNIX98 semantics is assumed */
2056
2057   if (args.o_option)
2058     {
2059       if (subcommand_option == CREATE_SUBCOMMAND)
2060         {
2061           /* GNU Tar <= 1.13 compatibility */
2062           set_archive_format ("v7");
2063         }
2064       else
2065         {
2066           /* UNIX98 compatibility */
2067           same_owner_option = -1;
2068         }
2069     }
2070
2071   /* Handle operands after any "--" argument.  */
2072   for (; index < argc; index++)
2073     {
2074       name_add_name (argv[index], MAKE_INCL_OPTIONS (&args));
2075       args.input_files = true;
2076     }
2077
2078   /* Warn about implicit use of the wildcards in command line arguments.
2079      See TODO */
2080   warn_regex_usage = args.wildcards == default_wildcards;
2081
2082   /* Derive option values and check option consistency.  */
2083
2084   if (archive_format == DEFAULT_FORMAT)
2085     {
2086       if (args.pax_option)
2087         archive_format = POSIX_FORMAT;
2088       else
2089         archive_format = DEFAULT_ARCHIVE_FORMAT;
2090     }
2091
2092   if ((volume_label_option && subcommand_option == CREATE_SUBCOMMAND)
2093       || incremental_option
2094       || multi_volume_option
2095       || sparse_option)
2096     assert_format (FORMAT_MASK (OLDGNU_FORMAT)
2097                    | FORMAT_MASK (GNU_FORMAT)
2098                    | FORMAT_MASK (POSIX_FORMAT));
2099
2100   if (occurrence_option)
2101     {
2102       if (!args.input_files)
2103         USAGE_ERROR ((0, 0,
2104                       _("--occurrence is meaningless without a file list")));
2105       if (subcommand_option != DELETE_SUBCOMMAND
2106           && subcommand_option != DIFF_SUBCOMMAND
2107           && subcommand_option != EXTRACT_SUBCOMMAND
2108           && subcommand_option != LIST_SUBCOMMAND)
2109             USAGE_ERROR ((0, 0,
2110                           _("--occurrence cannot be used in the requested operation mode")));
2111     }
2112
2113   if (seekable_archive && subcommand_option == DELETE_SUBCOMMAND)
2114     {
2115       /* The current code in delete.c is based on the assumption that
2116          skip_member() reads all data from the archive. So, we should
2117          make sure it won't use seeks. On the other hand, the same code
2118          depends on the ability to backspace a record in the archive,
2119          so setting seekable_archive to false is technically incorrect.
2120          However, it is tested only in skip_member(), so it's not a
2121          problem. */
2122       seekable_archive = false;
2123     }
2124
2125   if (archive_names == 0)
2126     {
2127       /* If no archive file name given, try TAPE from the environment, or
2128          else, DEFAULT_ARCHIVE from the configuration process.  */
2129
2130       archive_names = 1;
2131       archive_name_array[0] = getenv ("TAPE");
2132       if (! archive_name_array[0])
2133         archive_name_array[0] = DEFAULT_ARCHIVE;
2134     }
2135
2136   /* Allow multiple archives only with `-M'.  */
2137
2138   if (archive_names > 1 && !multi_volume_option)
2139     USAGE_ERROR ((0, 0,
2140                   _("Multiple archive files require `-M' option")));
2141
2142   if (listed_incremental_option
2143       && NEWER_OPTION_INITIALIZED (newer_mtime_option))
2144     USAGE_ERROR ((0, 0,
2145                   _("Cannot combine --listed-incremental with --newer")));
2146
2147   if (volume_label_option)
2148     {
2149       if (archive_format == GNU_FORMAT || archive_format == OLDGNU_FORMAT)
2150         {
2151           size_t volume_label_max_len =
2152             (sizeof current_header->header.name
2153              - 1 /* for trailing '\0' */
2154              - (multi_volume_option
2155                 ? (sizeof " Volume "
2156                    - 1 /* for null at end of " Volume " */
2157                    + INT_STRLEN_BOUND (int) /* for volume number */
2158                    - 1 /* for sign, as 0 <= volno */)
2159                 : 0));
2160           if (volume_label_max_len < strlen (volume_label_option))
2161             USAGE_ERROR ((0, 0,
2162                           ngettext ("%s: Volume label is too long (limit is %lu byte)",
2163                                     "%s: Volume label is too long (limit is %lu bytes)",
2164                                     volume_label_max_len),
2165                           quotearg_colon (volume_label_option),
2166                           (unsigned long) volume_label_max_len));
2167         }
2168       /* else FIXME
2169          Label length in PAX format is limited by the volume size. */
2170     }
2171
2172   if (verify_option)
2173     {
2174       if (multi_volume_option)
2175         USAGE_ERROR ((0, 0, _("Cannot verify multi-volume archives")));
2176       if (use_compress_program_option)
2177         USAGE_ERROR ((0, 0, _("Cannot verify compressed archives")));
2178     }
2179
2180   if (use_compress_program_option)
2181     {
2182       if (multi_volume_option)
2183         USAGE_ERROR ((0, 0, _("Cannot use multi-volume compressed archives")));
2184       if (subcommand_option == UPDATE_SUBCOMMAND
2185           || subcommand_option == APPEND_SUBCOMMAND
2186           || subcommand_option == DELETE_SUBCOMMAND)
2187         USAGE_ERROR ((0, 0, _("Cannot update compressed archives")));
2188       if (subcommand_option == CAT_SUBCOMMAND)
2189         USAGE_ERROR ((0, 0, _("Cannot concatenate compressed archives")));
2190     }
2191
2192   /* It is no harm to use --pax-option on non-pax archives in archive
2193      reading mode. It may even be useful, since it allows to override
2194      file attributes from tar headers. Therefore I allow such usage.
2195      --gray */
2196   if (args.pax_option
2197       && archive_format != POSIX_FORMAT
2198       && (subcommand_option != EXTRACT_SUBCOMMAND
2199           || subcommand_option != DIFF_SUBCOMMAND
2200           || subcommand_option != LIST_SUBCOMMAND))
2201     USAGE_ERROR ((0, 0, _("--pax-option can be used only on POSIX archives")));
2202
2203   /* If ready to unlink hierarchies, so we are for simpler files.  */
2204   if (recursive_unlink_option)
2205     old_files_option = UNLINK_FIRST_OLD_FILES;
2206
2207
2208   if (test_label_option)
2209     {
2210       /* --test-label is silent if the user has specified the label name to
2211          compare against. */
2212       if (!args.input_files)
2213         verbose_option++;
2214     }
2215   else if (utc_option)
2216     verbose_option = 2;
2217
2218   /* Forbid using -c with no input files whatsoever.  Check that `-f -',
2219      explicit or implied, is used correctly.  */
2220
2221   switch (subcommand_option)
2222     {
2223     case CREATE_SUBCOMMAND:
2224       if (!args.input_files && !files_from_option)
2225         USAGE_ERROR ((0, 0,
2226                       _("Cowardly refusing to create an empty archive")));
2227       break;
2228
2229     case EXTRACT_SUBCOMMAND:
2230     case LIST_SUBCOMMAND:
2231     case DIFF_SUBCOMMAND:
2232       for (archive_name_cursor = archive_name_array;
2233            archive_name_cursor < archive_name_array + archive_names;
2234            archive_name_cursor++)
2235         if (!strcmp (*archive_name_cursor, "-"))
2236           request_stdin ("-f");
2237       break;
2238
2239     case CAT_SUBCOMMAND:
2240     case UPDATE_SUBCOMMAND:
2241     case APPEND_SUBCOMMAND:
2242       for (archive_name_cursor = archive_name_array;
2243            archive_name_cursor < archive_name_array + archive_names;
2244            archive_name_cursor++)
2245         if (!strcmp (*archive_name_cursor, "-"))
2246           USAGE_ERROR ((0, 0,
2247                         _("Options `-Aru' are incompatible with `-f -'")));
2248
2249     default:
2250       break;
2251     }
2252
2253   /* Initialize stdlis */
2254   if (index_file_name)
2255     {
2256       stdlis = fopen (index_file_name, "w");
2257       if (! stdlis)
2258         open_error (index_file_name);
2259     }
2260   else
2261     stdlis = to_stdout_option ? stderr : stdout;
2262
2263   archive_name_cursor = archive_name_array;
2264
2265   /* Prepare for generating backup names.  */
2266
2267   if (args.backup_suffix_string)
2268     simple_backup_suffix = xstrdup (args.backup_suffix_string);
2269
2270   if (backup_option)
2271     {
2272       backup_type = xget_version ("--backup", args.version_control_string);
2273       /* No backup is needed either if explicitely disabled or if
2274          the extracted files are not being written to disk. */
2275       if (backup_type == no_backups || EXTRACT_OVER_PIPE)
2276         backup_option = false;
2277     }
2278
2279   if (verbose_option)
2280     report_textual_dates (&args);
2281 }
2282
2283 \f
2284 /* Tar proper.  */
2285
2286 /* Main routine for tar.  */
2287 int
2288 main (int argc, char **argv)
2289 {
2290   set_start_time ();
2291   program_name = argv[0];
2292
2293   setlocale (LC_ALL, "");
2294   bindtextdomain (PACKAGE, LOCALEDIR);
2295   textdomain (PACKAGE);
2296
2297   exit_failure = TAREXIT_FAILURE;
2298   exit_status = TAREXIT_SUCCESS;
2299   filename_terminator = '\n';
2300   set_quoting_style (0, DEFAULT_QUOTING_STYLE);
2301
2302   /* Make sure we have first three descriptors available */
2303   stdopen ();
2304
2305   /* Pre-allocate a few structures.  */
2306
2307   allocated_archive_names = 10;
2308   archive_name_array =
2309     xmalloc (sizeof (const char *) * allocated_archive_names);
2310   archive_names = 0;
2311
2312   obstack_init (&argv_stk);
2313
2314 #ifdef SIGCHLD
2315   /* System V fork+wait does not work if SIGCHLD is ignored.  */
2316   signal (SIGCHLD, SIG_DFL);
2317 #endif
2318
2319   /* Decode options.  */
2320
2321   decode_options (argc, argv);
2322
2323   name_init ();
2324
2325   /* Main command execution.  */
2326
2327   if (volno_file_option)
2328     init_volume_number ();
2329
2330   switch (subcommand_option)
2331     {
2332     case UNKNOWN_SUBCOMMAND:
2333       USAGE_ERROR ((0, 0,
2334                     _("You must specify one of the `-Acdtrux' options")));
2335
2336     case CAT_SUBCOMMAND:
2337     case UPDATE_SUBCOMMAND:
2338     case APPEND_SUBCOMMAND:
2339       update_archive ();
2340       break;
2341
2342     case DELETE_SUBCOMMAND:
2343       delete_archive_members ();
2344       break;
2345
2346     case CREATE_SUBCOMMAND:
2347       create_archive ();
2348       break;
2349
2350     case EXTRACT_SUBCOMMAND:
2351       extr_init ();
2352       read_and (extract_archive);
2353
2354       /* FIXME: should extract_finish () even if an ordinary signal is
2355          received.  */
2356       extract_finish ();
2357
2358       break;
2359
2360     case LIST_SUBCOMMAND:
2361       read_and (list_archive);
2362       break;
2363
2364     case DIFF_SUBCOMMAND:
2365       diff_init ();
2366       read_and (diff_archive);
2367       break;
2368     }
2369
2370   if (totals_option)
2371     print_total_stats ();
2372
2373   if (check_links_option)
2374     check_links ();
2375
2376   if (volno_file_option)
2377     closeout_volume_number ();
2378
2379   /* Dispose of allocated memory, and return.  */
2380
2381   free (archive_name_array);
2382   name_term ();
2383
2384   if (exit_status == TAREXIT_FAILURE)
2385     error (0, 0, _("Error exit delayed from previous errors"));
2386
2387   if (stdlis == stdout)
2388     close_stdout ();
2389   else if (ferror (stderr) || fclose (stderr) != 0)
2390     exit_status = TAREXIT_FAILURE;
2391
2392   return exit_status;
2393 }
2394
2395 void
2396 tar_stat_init (struct tar_stat_info *st)
2397 {
2398   memset (st, 0, sizeof (*st));
2399 }
2400
2401 void
2402 tar_stat_destroy (struct tar_stat_info *st)
2403 {
2404   free (st->orig_file_name);
2405   free (st->file_name);
2406   free (st->link_name);
2407   free (st->uname);
2408   free (st->gname);
2409   free (st->sparse_map);
2410   free (st->dumpdir);
2411   xheader_destroy (&st->xhdr);
2412   memset (st, 0, sizeof (*st));
2413 }
2414
2415 /* Format mask for all available formats that support nanosecond
2416    timestamp resolution. */
2417 #define NS_PRECISION_FORMAT_MASK FORMAT_MASK (POSIX_FORMAT)
2418
2419 /* Same as timespec_cmp, but ignore nanoseconds if current archive
2420    format does not provide sufficient resolution.  */
2421 int
2422 tar_timespec_cmp (struct timespec a, struct timespec b)
2423 {
2424   if (!(FORMAT_MASK (current_format) & NS_PRECISION_FORMAT_MASK))
2425     a.tv_nsec = b.tv_nsec = 0;
2426   return timespec_cmp (a, b);
2427 }