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

   1 /* A tar (tape archiver) program.
   2    Copyright 1988, 92,93,94,95,96,97, 1999 Free Software Foundation, Inc.
   3    Written by John Gilmore, starting 1985-08-25.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 2, or (at your option) any later
   8    version.
   9
  10    This program is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  13    Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with this program; if not, write to the Free Software Foundation, Inc.,
  17    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #include "system.h"
  20
  21 #include <getopt.h>
  22
  23 #include <signal.h>
  24 #if ! defined SIGCHLD && defined SIGCLD
  25 # define SIGCHLD SIGCLD
  26 #endif
  27
  28 /* The following causes "common.h" to produce definitions of all the global
  29    variables, rather than just "extern" declarations of them.  GNU tar does
  30    depend on the system loader to preset all GLOBAL variables to neutral (or
  31    zero) values, explicit initialisation is usually not done.  */
  32 #define GLOBAL
  33 #include "common.h"
  34
  35 #include "xstrtol.h"
  36
  37 time_t get_date ();
  38
  39 /* Local declarations.  */
  40
  41 #ifndef DEFAULT_ARCHIVE
  42 # define DEFAULT_ARCHIVE "tar.out"
  43 #endif
  44
  45 #ifndef DEFAULT_BLOCKING
  46 # define DEFAULT_BLOCKING 20
  47 #endif
  48
  49 static void usage PARAMS ((int));
  50 \f
  51 /* Miscellaneous.  */
  52
  53 /*----------------------------------------------.
  54 | Doesn't return if stdin already requested.    |
  55 `----------------------------------------------*/
  56
  57 /* Name of option using stdin.  */
  58 static const char *stdin_used_by = NULL;
  59
  60 void
  61 request_stdin (const char *option)
  62 {
  63   if (stdin_used_by)
  64     USAGE_ERROR ((0, 0, _("Options `-%s' and `-%s' both want standard input"),
  65                   stdin_used_by, option));
  66
  67   stdin_used_by = option;
  68 }
  69
  70 /*--------------------------------------------------------.
  71 | Returns true if and only if the user typed 'y' or 'Y'.  |
  72 `--------------------------------------------------------*/
  73
  74 int
  75 confirm (const char *message_action, const char *message_name)
  76 {
  77   static FILE *confirm_file = NULL;
  78
  79   if (!confirm_file)
  80     {
  81       if (archive == 0 || stdin_used_by)
  82         confirm_file = fopen (TTY_NAME, "r");
  83       else
  84         {
  85           request_stdin ("-w");
  86           confirm_file = stdin;
  87         }
  88
  89       if (!confirm_file)
  90         FATAL_ERROR ((0, 0, _("Cannot read confirmation from user")));
  91     }
  92
  93   fprintf (stdlis, "%s %s?", message_action, message_name);
  94   fflush (stdlis);
  95
  96   {
  97     int reply = getc (confirm_file);
  98     int character;
  99
 100     for (character = reply;
 101          character != '\n' && character != EOF;
 102          character = getc (confirm_file))
 103       continue;
 104     return reply == 'y' || reply == 'Y';
 105   }
 106 }
 107 \f
 108 /* Options.  */
 109
 110 /* For long options that unconditionally set a single flag, we have getopt
 111    do it.  For the others, we share the code for the equivalent short
 112    named option, the name of which is stored in the otherwise-unused `val'
 113    field of the `struct option'; for long options that have no equivalent
 114    short option, we use non-characters as pseudo short options,
 115    starting at CHAR_MAX + 1 and going upwards.  */
 116
 117 enum
 118 {
 119   BACKUP_OPTION = CHAR_MAX + 1,
 120   DELETE_OPTION,
 121   EXCLUDE_OPTION,
 122   GROUP_OPTION,
 123   MODE_OPTION,
 124   NEWER_MTIME_OPTION,
 125   NO_RECURSE_OPTION,
 126   NULL_OPTION,
 127   OWNER_OPTION,
 128   POSIX_OPTION,
 129   PRESERVE_OPTION,
 130   RECORD_SIZE_OPTION,
 131   RSH_COMMAND_OPTION,
 132   SUFFIX_OPTION,
 133   USE_COMPRESS_PROGRAM_OPTION,
 134   VOLNO_FILE_OPTION,
 135
 136   /* Some cleanup is being made in GNU tar long options.  Using old names is
 137      allowed for a while, but will also send a warning to stderr.  Take old
 138      names out in 1.14, or in summer 1997, whichever happens last.  */
 139
 140   OBSOLETE_ABSOLUTE_NAMES,
 141   OBSOLETE_BLOCK_COMPRESS,
 142   OBSOLETE_BLOCKING_FACTOR,
 143   OBSOLETE_BLOCK_NUMBER,
 144   OBSOLETE_READ_FULL_RECORDS,
 145   OBSOLETE_TOUCH,
 146   OBSOLETE_VERSION_CONTROL
 147 };
 148
 149 /* If nonzero, display usage information and exit.  */
 150 static int show_help = 0;
 151
 152 /* If nonzero, print the version on standard output and exit.  */
 153 static int show_version = 0;
 154
 155 struct option long_options[] =
 156 {
 157   {"absolute-names", no_argument, NULL, 'P'},
 158   {"absolute-paths", no_argument, NULL, OBSOLETE_ABSOLUTE_NAMES},
 159   {"after-date", required_argument, NULL, 'N'},
 160   {"append", no_argument, NULL, 'r'},
 161   {"atime-preserve", no_argument, &atime_preserve_option, 1},
 162   {"backup", optional_argument, NULL, BACKUP_OPTION},
 163   {"block-compress", no_argument, NULL, OBSOLETE_BLOCK_COMPRESS},
 164   {"block-number", no_argument, NULL, 'R'},
 165   {"block-size", required_argument, NULL, OBSOLETE_BLOCKING_FACTOR},
 166   {"blocking-factor", required_argument, NULL, 'b'},
 167   {"bzip2", no_argument, NULL, 'y'},
 168   {"catenate", no_argument, NULL, 'A'},
 169   {"checkpoint", no_argument, &checkpoint_option, 1},
 170   {"compare", no_argument, NULL, 'd'},
 171   {"compress", no_argument, NULL, 'Z'},
 172   {"concatenate", no_argument, NULL, 'A'},
 173   {"confirmation", no_argument, NULL, 'w'},
 174   /* FIXME: --selective as a synonym for --confirmation?  */
 175   {"create", no_argument, NULL, 'c'},
 176   {"delete", no_argument, NULL, DELETE_OPTION},
 177   {"dereference", no_argument, NULL, 'h'},
 178   {"diff", no_argument, NULL, 'd'},
 179   {"directory", required_argument, NULL, 'C'},
 180   {"exclude", required_argument, NULL, EXCLUDE_OPTION},
 181   {"exclude-from", required_argument, NULL, 'X'},
 182   {"extract", no_argument, NULL, 'x'},
 183   {"file", required_argument, NULL, 'f'},
 184   {"files-from", required_argument, NULL, 'T'},
 185   {"force-local", no_argument, &force_local_option, 1},
 186   {"get", no_argument, NULL, 'x'},
 187   {"group", required_argument, NULL, GROUP_OPTION},
 188   {"gunzip", no_argument, NULL, 'z'},
 189   {"gzip", no_argument, NULL, 'z'},
 190   {"help", no_argument, &show_help, 1},
 191   {"ignore-failed-read", no_argument, &ignore_failed_read_option, 1},
 192   {"ignore-zeros", no_argument, NULL, 'i'},
 193   /* FIXME: --ignore-end as a new name for --ignore-zeros?  */
 194   {"incremental", no_argument, NULL, 'G'},
 195   {"info-script", required_argument, NULL, 'F'},
 196   {"interactive", no_argument, NULL, 'w'},
 197   {"keep-old-files", no_argument, NULL, 'k'},
 198   {"label", required_argument, NULL, 'V'},
 199   {"list", no_argument, NULL, 't'},
 200   {"listed-incremental", required_argument, NULL, 'g'},
 201   {"mode", required_argument, NULL, MODE_OPTION},
 202   {"modification-time", no_argument, NULL, OBSOLETE_TOUCH},
 203   {"multi-volume", no_argument, NULL, 'M'},
 204   {"new-volume-script", required_argument, NULL, 'F'},
 205   {"newer", required_argument, NULL, 'N'},
 206   {"newer-mtime", required_argument, NULL, NEWER_MTIME_OPTION},
 207   {"null", no_argument, NULL, NULL_OPTION},
 208   {"no-recursion", no_argument, NULL, NO_RECURSE_OPTION},
 209   {"numeric-owner", no_argument, &numeric_owner_option, 1},
 210   {"old-archive", no_argument, NULL, 'o'},
 211   {"one-file-system", no_argument, NULL, 'l'},
 212   {"owner", required_argument, NULL, OWNER_OPTION},
 213   {"portability", no_argument, NULL, 'o'},
 214   {"posix", no_argument, NULL, POSIX_OPTION},
 215   {"preserve", no_argument, NULL, PRESERVE_OPTION},
 216   {"preserve-order", no_argument, NULL, 's'},
 217   {"preserve-permissions", no_argument, NULL, 'p'},
 218   {"recursive-unlink", no_argument, &recursive_unlink_option, 1},
 219   {"read-full-blocks", no_argument, NULL, OBSOLETE_READ_FULL_RECORDS},
 220   {"read-full-records", no_argument, NULL, 'B'},
 221   /* FIXME: --partial-blocks might be a synonym for --read-full-records?  */
 222   {"record-number", no_argument, NULL, OBSOLETE_BLOCK_NUMBER},
 223   {"record-size", required_argument, NULL, RECORD_SIZE_OPTION},
 224   {"remove-files", no_argument, &remove_files_option, 1},
 225   {"rsh-command", required_argument, NULL, RSH_COMMAND_OPTION},
 226   {"same-order", no_argument, NULL, 's'},
 227   {"same-owner", no_argument, &same_owner_option, 1},
 228   {"same-permissions", no_argument, NULL, 'p'},
 229   {"show-omitted-dirs", no_argument, &show_omitted_dirs_option, 1},
 230   {"sparse", no_argument, NULL, 'S'},
 231   {"starting-file", required_argument, NULL, 'K'},
 232   {"suffix", required_argument, NULL, SUFFIX_OPTION},
 233   {"tape-length", required_argument, NULL, 'L'},
 234   {"to-stdout", no_argument, NULL, 'O'},
 235   {"totals", no_argument, &totals_option, 1},
 236   {"touch", no_argument, NULL, 'm'},
 237   {"uncompress", no_argument, NULL, 'Z'},
 238   {"ungzip", no_argument, NULL, 'z'},
 239   {"unlink-first", no_argument, NULL, 'U'},
 240   {"update", no_argument, NULL, 'u'},
 241   {"use-compress-program", required_argument, NULL, USE_COMPRESS_PROGRAM_OPTION},
 242   {"verbose", no_argument, NULL, 'v'},
 243   {"verify", no_argument, NULL, 'W'},
 244   {"version", no_argument, &show_version, 1},
 245   {"version-control", required_argument, NULL, OBSOLETE_VERSION_CONTROL},
 246   {"volno-file", required_argument, NULL, VOLNO_FILE_OPTION},
 247
 248   {0, 0, 0, 0}
 249 };
 250
 251 /*---------------------------------------------.
 252 | Print a usage message and exit with STATUS.  |
 253 `---------------------------------------------*/
 254
 255 static void
 256 usage (int status)
 257 {
 258   if (status != TAREXIT_SUCCESS)
 259     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 260              program_name);
 261   else
 262     {
 263       fputs (_("\
 264 GNU `tar' saves many files together into a single tape or disk archive, and\n\
 265 can restore individual files from the archive.\n"),
 266              stdout);
 267       printf (_("\nUsage: %s [OPTION]... [FILE]...\n"), program_name);
 268       fputs (_("\
 269 \n\
 270 If a long option shows an argument as mandatory, then it is mandatory\n\
 271 for the equivalent short option also.  Similarly for optional arguments.\n"),
 272              stdout);
 273       fputs(_("\
 274 \n\
 275 Main operation mode:\n\
 276   -t, --list              list the contents of an archive\n\
 277   -x, --extract, --get    extract files from an archive\n\
 278   -c, --create            create a new archive\n\
 279   -d, --diff, --compare   find differences between archive and file system\n\
 280   -r, --append            append files to the end of an archive\n\
 281   -u, --update            only append files newer than copy in archive\n\
 282   -A, --catenate          append tar files to an archive\n\
 283       --concatenate       same as -A\n\
 284       --delete            delete from the archive (not on mag tapes!)\n"),
 285             stdout);
 286       fputs (_("\
 287 \n\
 288 Operation modifiers:\n\
 289   -W, --verify               attempt to verify the archive after writing it\n\
 290       --remove-files         remove files after adding them to the archive\n\
 291   -k, --keep-old-files       don't overwrite existing files when extracting\n\
 292   -U, --unlink-first         remove each file prior to extracting over it\n\
 293       --recursive-unlink     empty hierarchies prior to extracting directory\n\
 294   -S, --sparse               handle sparse files efficiently\n\
 295   -O, --to-stdout            extract files to standard output\n\
 296   -G, --incremental          handle old GNU-format incremental backup\n\
 297   -g, --listed-incremental   handle new GNU-format incremental backup\n\
 298       --ignore-failed-read   do not exit with nonzero on unreadable files\n"),
 299              stdout);
 300       fputs (_("\
 301 \n\
 302 Handling of file attributes:\n\
 303       --owner=NAME             force NAME as owner for added files\n\
 304       --group=NAME             force NAME as group for added files\n\
 305       --mode=CHANGES           force (symbolic) mode CHANGES for added files\n\
 306       --atime-preserve         don't change access times on dumped files\n\
 307   -m, --modification-time      don't extract file modified time\n\
 308       --same-owner             try extracting files with the same ownership\n\
 309       --numeric-owner          always use numbers for user/group names\n\
 310   -p, --same-permissions       extract all protection information\n\
 311       --preserve-permissions   same as -p\n\
 312   -s, --same-order             sort names to extract to match archive\n\
 313       --preserve-order         same as -s\n\
 314       --preserve               same as both -p and -s\n"),
 315              stdout);
 316       fputs (_("\
 317 \n\
 318 Device selection and switching:\n\
 319   -f, --file=ARCHIVE             use archive file or device ARCHIVE\n\
 320       --force-local              archive file is local even if has a colon\n\
 321       --rsh-command=COMMAND      use remote COMMAND instead of rsh\n\
 322   -[0-7][lmh]                    specify drive and density\n\
 323   -M, --multi-volume             create/list/extract multi-volume archive\n\
 324   -L, --tape-length=NUM          change tape after writing NUM x 1024 bytes\n\
 325   -F, --info-script=FILE         run script at end of each tape (implies -M)\n\
 326       --new-volume-script=FILE   same as -F FILE\n\
 327       --volno-file=FILE          use/update the volume number in FILE\n"),
 328              stdout);
 329       fputs (_("\
 330 \n\
 331 Device blocking:\n\
 332   -b, --blocking-factor=BLOCKS   BLOCKS x 512 bytes per record\n\
 333       --record-size=SIZE         SIZE bytes per record, multiple of 512\n\
 334   -i, --ignore-zeros             ignore zeroed blocks in archive (means EOF)\n\
 335   -B, --read-full-records        reblock as we read (for 4.2BSD pipes)\n"),
 336              stdout);
 337       fputs (_("\
 338 \n\
 339 Archive format selection:\n\
 340   -V, --label=NAME                   create archive with volume name NAME\n\
 341               PATTERN                at list/extract time, a globbing PATTERN\n\
 342   -o, --old-archive, --portability   write a V7 format archive\n\
 343       --posix                        write a POSIX conformant archive\n\
 344   -y, --bzip2                        filter the archive through bzip2\n\
 345   -z, --gzip, --ungzip               filter the archive through gzip\n\
 346   -Z, --compress, --uncompress       filter the archive through compress\n\
 347       --use-compress-program=PROG    filter through PROG (must accept -d)\n"),
 348              stdout);
 349       fputs (_("\
 350 \n\
 351 Local file selection:\n\
 352   -C, --directory=DIR          change to directory DIR\n\
 353   -T, --files-from=NAME        get names to extract or create from file NAME\n\
 354       --null                   -T reads null-terminated names, disable -C\n\
 355       --exclude=PATTERN        exclude files, given as a globbing PATTERN\n\
 356   -X, --exclude-from=FILE      exclude globbing patterns listed in FILE\n\
 357   -P, --absolute-names         don't strip leading `/'s from file names\n\
 358   -h, --dereference            dump instead the files symlinks point to\n\
 359       --no-recursion           avoid descending automatically in directories\n\
 360   -l, --one-file-system        stay in local file system when creating archive\n\
 361   -K, --starting-file=NAME     begin at file NAME in the archive\n"),
 362              stdout);
 363 #if !MSDOS
 364       fputs (_("\
 365   -N, --newer=DATE             only store files newer than DATE\n\
 366       --newer-mtime            compare date and time when data changed only\n\
 367       --after-date=DATE        same as -N\n"),
 368              stdout);
 369 #endif
 370       fputs (_("\
 371       --backup[=CONTROL]       backup before removal, choose version control\n\
 372       --suffix=SUFFIX          backup before removel, override usual suffix\n"),
 373              stdout);
 374       fputs (_("\
 375 \n\
 376 Informative output:\n\
 377       --help            print this help, then exit\n\
 378       --version         print tar program version number, then exit\n\
 379   -v, --verbose         verbosely list files processed\n\
 380       --checkpoint      print directory names while reading the archive\n\
 381       --totals          print total bytes written while creating archive\n\
 382   -R, --block-number    show block number within archive with each message\n\
 383   -w, --interactive     ask for confirmation for every action\n\
 384       --confirmation    same as -w\n"),
 385              stdout);
 386       fputs (_("\
 387 \n\
 388 The backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
 389 The version control may be set with --backup or VERSION_CONTROL, values are:\n\
 390 \n\
 391   t, numbered     make numbered backups\n\
 392   nil, existing   numbered if numbered backups exist, simple otherwise\n\
 393   never, simple   always make simple backups\n"),
 394              stdout);
 395       printf (_("\
 396 \n\
 397 GNU tar cannot read nor produce `--posix' archives.  If POSIXLY_CORRECT\n\
 398 is set in the environment, GNU extensions are disallowed with `--posix'.\n\
 399 Support for POSIX is only partially implemented, don't count on it yet.\n\
 400 ARCHIVE may be FILE, HOST:FILE or USER@HOST:FILE; and FILE may be a file\n\
 401 or a device.  *This* `tar' defaults to `-f%s -b%d'.\n"),
 402               DEFAULT_ARCHIVE, DEFAULT_BLOCKING);
 403       fputs (_("\
 404 \n\
 405 Report bugs to <bug-tar@gnu.org>.\n"),
 406                stdout);
 407     }
 408   exit (status);
 409 }
 410
 411 /*----------------------------.
 412 | Parse the options for tar.  |
 413 `----------------------------*/
 414
 415 /* Available option letters are DEHIJQY and aejnqy.  Some are reserved:
 416
 417    y  per-file gzip compression
 418    Y  per-block gzip compression */
 419
 420 #define OPTION_STRING \
 421   "-01234567ABC:F:GK:L:MN:OPRST:UV:WX:Zb:cdf:g:hiklmoprstuvwxyz"
 422
 423 static void
 424 set_subcommand_option (enum subcommand subcommand)
 425 {
 426   if (subcommand_option != UNKNOWN_SUBCOMMAND
 427       && subcommand_option != subcommand)
 428     USAGE_ERROR ((0, 0,
 429                   _("You may not specify more than one `-Acdtrux' option")));
 430
 431   subcommand_option = subcommand;
 432 }
 433
 434 static void
 435 set_use_compress_program_option (const char *string)
 436 {
 437   if (use_compress_program_option && strcmp (use_compress_program_option, string) != 0)
 438     USAGE_ERROR ((0, 0, _("Conflicting compression options")));
 439
 440   use_compress_program_option = string;
 441 }
 442
 443 /* Ignore DUMMY (which will always be null in practice), and add
 444    PATTERN to the proper set of patterns to be excluded -- either
 445    patterns with slashes, or patterns without.  */
 446 static void
 447 add_filtered_exclude (struct exclude *dummy, char const *pattern)
 448 {
 449   add_exclude ((strchr (pattern, '/')
 450                 ? excluded_with_slash
 451                 : excluded_without_slash),
 452                pattern);
 453 }
 454
 455 static void
 456 decode_options (int argc, char *const *argv)
 457 {
 458   int optchar;                  /* option letter */
 459   int input_files;              /* number of input files */
 460   const char *backup_suffix_string;
 461   const char *version_control_string = NULL;
 462
 463   /* Set some default option values.  */
 464
 465   subcommand_option = UNKNOWN_SUBCOMMAND;
 466   archive_format = DEFAULT_FORMAT;
 467   blocking_factor = DEFAULT_BLOCKING;
 468   record_size = DEFAULT_BLOCKING * BLOCKSIZE;
 469   excluded_with_slash = new_exclude ();
 470   excluded_without_slash = new_exclude ();
 471   newer_mtime_option = TYPE_MINIMUM (time_t);
 472
 473   owner_option = -1;
 474   group_option = -1;
 475
 476   backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
 477
 478   /* Convert old-style tar call by exploding option element and rearranging
 479      options accordingly.  */
 480
 481   if (argc > 1 && argv[1][0] != '-')
 482     {
 483       int new_argc;             /* argc value for rearranged arguments */
 484       char **new_argv;          /* argv value for rearranged arguments */
 485       char *const *in;          /* cursor into original argv */
 486       char **out;               /* cursor into rearranged argv */
 487       const char *letter;       /* cursor into old option letters */
 488       char buffer[3];           /* constructed option buffer */
 489       const char *cursor;       /* cursor in OPTION_STRING */
 490
 491       /* Initialize a constructed option.  */
 492
 493       buffer[0] = '-';
 494       buffer[2] = '\0';
 495
 496       /* Allocate a new argument array, and copy program name in it.  */
 497
 498       new_argc = argc - 1 + strlen (argv[1]);
 499       new_argv = (char **) xmalloc (new_argc * sizeof (char *));
 500       in = argv;
 501       out = new_argv;
 502       *out++ = *in++;
 503
 504       /* Copy each old letter option as a separate option, and have the
 505          corresponding argument moved next to it.  */
 506
 507       for (letter = *in++; *letter; letter++)
 508         {
 509           buffer[1] = *letter;
 510           *out++ = xstrdup (buffer);
 511           cursor = strchr (OPTION_STRING, *letter);
 512           if (cursor && cursor[1] == ':')
 513             {
 514               if (in < argv + argc)
 515                 *out++ = *in++;
 516               else
 517                 USAGE_ERROR ((0, 0, _("Old option `%c' requires an argument."),
 518                               *letter));
 519             }
 520         }
 521
 522       /* Copy all remaining options.  */
 523
 524       while (in < argv + argc)
 525         *out++ = *in++;
 526
 527       /* Replace the old option list by the new one.  */
 528
 529       argc = new_argc;
 530       argv = new_argv;
 531     }
 532
 533   /* Parse all options and non-options as they appear.  */
 534
 535   input_files = 0;
 536
 537   while (optchar = getopt_long (argc, argv, OPTION_STRING, long_options, NULL),
 538          optchar != EOF)
 539     switch (optchar)
 540       {
 541       case '?':
 542         usage (TAREXIT_FAILURE);
 543
 544       case 0:
 545         break;
 546
 547       case 1:
 548         /* File name or non-parsed option, because of RETURN_IN_ORDER
 549            ordering triggerred by the leading dash in OPTION_STRING.  */
 550
 551         name_add (optarg);
 552         input_files++;
 553         break;
 554
 555       case 'A':
 556         set_subcommand_option (CAT_SUBCOMMAND);
 557         break;
 558
 559       case OBSOLETE_BLOCK_COMPRESS:
 560         WARN ((0, 0, _("Obsolete option, now implied by --blocking-factor")));
 561         break;
 562
 563       case OBSOLETE_BLOCKING_FACTOR:
 564         WARN ((0, 0, _("Obsolete option name replaced by --blocking-factor")));
 565         /* Fall through.  */
 566
 567       case 'b':
 568         {
 569           uintmax_t u;
 570           if (! (xstrtoumax (optarg, (char **) 0, 10, &u, "") == LONGINT_OK
 571                  && u == (blocking_factor = u)
 572                  && 0 < blocking_factor
 573                  && u == (record_size = u * (size_t) BLOCKSIZE) / BLOCKSIZE))
 574             USAGE_ERROR ((0, 0, _("Invalid blocking factor")));
 575         }
 576         break;
 577
 578       case OBSOLETE_READ_FULL_RECORDS:
 579         WARN ((0, 0,
 580                _("Obsolete option name replaced by --read-full-records")));
 581         /* Fall through.  */
 582
 583       case 'B':
 584         /* Try to reblock input records.  For reading 4.2BSD pipes.  */
 585
 586         /* It would surely make sense to exchange -B and -R, but it seems
 587            that -B has been used for a long while in Sun tar ans most
 588            BSD-derived systems.  This is a consequence of the block/record
 589            terminology confusion.  */
 590
 591         read_full_records_option = 1;
 592         break;
 593
 594       case 'c':
 595         set_subcommand_option (CREATE_SUBCOMMAND);
 596         break;
 597
 598       case 'C':
 599         name_add ("-C");
 600         name_add (optarg);
 601         break;
 602
 603       case 'd':
 604         set_subcommand_option (DIFF_SUBCOMMAND);
 605         break;
 606
 607       case 'f':
 608         if (archive_names == allocated_archive_names)
 609           {
 610             allocated_archive_names *= 2;
 611             archive_name_array = (const char **)
 612               xrealloc (archive_name_array,
 613                         sizeof (const char *) * allocated_archive_names);
 614           }
 615         archive_name_array[archive_names++] = optarg;
 616         break;
 617
 618       case 'F':
 619         /* Since -F is only useful with -M, make it implied.  Run this
 620            script at the end of each tape.  */
 621
 622         info_script_option = optarg;
 623         multi_volume_option = 1;
 624         break;
 625
 626       case 'g':
 627         listed_incremental_option = optarg;
 628         after_date_option = 1;
 629         /* Fall through.  */
 630
 631       case 'G':
 632         /* We are making an incremental dump (FIXME: are we?); save
 633            directories at the beginning of the archive, and include in each
 634            directory its contents.  */
 635
 636         incremental_option = 1;
 637         break;
 638
 639       case 'h':
 640         /* Follow symbolic links.  */
 641
 642         dereference_option = 1;
 643         break;
 644
 645       case 'i':
 646         /* Ignore zero blocks (eofs).  This can't be the default,
 647            because Unix tar writes two blocks of zeros, then pads out
 648            the record with garbage.  */
 649
 650         ignore_zeros_option = 1;
 651         break;
 652
 653       case 'k':
 654         /* Don't overwrite existing files.  */
 655
 656         keep_old_files_option = 1;
 657         break;
 658
 659       case 'K':
 660         starting_file_option = 1;
 661         addname (optarg);
 662         break;
 663
 664       case 'l':
 665         /* When dumping directories, don't dump files/subdirectories
 666            that are on other filesystems.  */
 667
 668         one_file_system_option = 1;
 669         break;
 670
 671       case 'L':
 672         {
 673           uintmax_t u;
 674           if (xstrtoumax (optarg, (char **) 0, 10, &u, "") != LONG_MAX)
 675             USAGE_ERROR ((0, 0, _("Invalid tape length")));
 676           tape_length_option = 1024 * (tarlong) u;
 677           multi_volume_option = 1;
 678         }
 679         break;
 680
 681       case OBSOLETE_TOUCH:
 682         WARN ((0, 0, _("Obsolete option name replaced by --touch")));
 683         /* Fall through.  */
 684
 685       case 'm':
 686         touch_option = 1;
 687         break;
 688
 689       case 'M':
 690         /* Make multivolume archive: when we can't write any more into
 691            the archive, re-open it, and continue writing.  */
 692
 693         multi_volume_option = 1;
 694         break;
 695
 696 #if !MSDOS
 697       case 'N':
 698         after_date_option = 1;
 699         /* Fall through.  */
 700
 701       case NEWER_MTIME_OPTION:
 702         if (newer_mtime_option != TYPE_MINIMUM (time_t))
 703           USAGE_ERROR ((0, 0, _("More than one threshold date")));
 704
 705         newer_mtime_option = get_date (optarg, (voidstar) 0);
 706         if (newer_mtime_option == (time_t) -1)
 707           USAGE_ERROR ((0, 0, _("Invalid date format `%s'"), optarg));
 708
 709         break;
 710 #endif /* not MSDOS */
 711
 712       case 'o':
 713         if (archive_format == DEFAULT_FORMAT)
 714           archive_format = V7_FORMAT;
 715         else if (archive_format != V7_FORMAT)
 716           USAGE_ERROR ((0, 0, _("Conflicting archive format options")));
 717         break;
 718
 719       case 'O':
 720         to_stdout_option = 1;
 721         break;
 722
 723       case 'p':
 724         same_permissions_option = 1;
 725         break;
 726
 727       case OBSOLETE_ABSOLUTE_NAMES:
 728         WARN ((0, 0, _("Obsolete option name replaced by --absolute-names")));
 729         /* Fall through.  */
 730
 731       case 'P':
 732         absolute_names_option = 1;
 733         break;
 734
 735       case 'r':
 736         set_subcommand_option (APPEND_SUBCOMMAND);
 737         break;
 738
 739       case OBSOLETE_BLOCK_NUMBER:
 740         WARN ((0, 0, _("Obsolete option name replaced by --block-number")));
 741         /* Fall through.  */
 742
 743       case 'R':
 744         /* Print block numbers for debugging bad tar archives.  */
 745
 746         /* It would surely make sense to exchange -B and -R, but it seems
 747            that -B has been used for a long while in Sun tar ans most
 748            BSD-derived systems.  This is a consequence of the block/record
 749            terminology confusion.  */
 750
 751         block_number_option = 1;
 752         break;
 753
 754       case 's':
 755         /* Names to extr are sorted.  */
 756
 757         same_order_option = 1;
 758         break;
 759
 760       case 'S':
 761         sparse_option = 1;
 762         break;
 763
 764       case 't':
 765         set_subcommand_option (LIST_SUBCOMMAND);
 766         verbose_option++;
 767         break;
 768
 769       case 'T':
 770         files_from_option = optarg;
 771         break;
 772
 773       case 'u':
 774         set_subcommand_option (UPDATE_SUBCOMMAND);
 775         break;
 776
 777       case 'U':
 778         unlink_first_option = 1;
 779         break;
 780
 781       case 'v':
 782         verbose_option++;
 783         break;
 784
 785       case 'V':
 786         volume_label_option = optarg;
 787         break;
 788
 789       case 'w':
 790         interactive_option = 1;
 791         break;
 792
 793       case 'W':
 794         verify_option = 1;
 795         break;
 796
 797       case 'x':
 798         set_subcommand_option (EXTRACT_SUBCOMMAND);
 799         break;
 800
 801       case 'X':
 802         if (add_exclude_file (add_filtered_exclude, NULL, optarg, '\n') != 0)
 803           FATAL_ERROR ((0, errno, "%s", optarg));
 804         break;
 805
 806       case 'y':
 807         set_use_compress_program_option ("bzip2");
 808         break;
 809
 810       case 'z':
 811         set_use_compress_program_option ("gzip");
 812         break;
 813
 814       case 'Z':
 815         set_use_compress_program_option ("compress");
 816         break;
 817
 818       case OBSOLETE_VERSION_CONTROL:
 819         WARN ((0, 0, _("Obsolete option name replaced by --backup")));
 820         /* Fall through.  */
 821
 822       case BACKUP_OPTION:
 823         backup_option = 1;
 824         if (optarg)
 825           version_control_string = optarg;
 826         break;
 827
 828       case DELETE_OPTION:
 829         set_subcommand_option (DELETE_SUBCOMMAND);
 830         break;
 831
 832       case EXCLUDE_OPTION:
 833         add_filtered_exclude (NULL, optarg);
 834         break;
 835
 836       case GROUP_OPTION:
 837         if (! (strlen (optarg) < GNAME_FIELD_SIZE
 838                && gname_to_gid (optarg, &group_option)))
 839           {
 840             uintmax_t g;
 841             if (xstrtoumax (optarg, (char **) 0, 10, &g, "") == LONGINT_OK
 842                 && g == (gid_t) g)
 843               group_option = g;
 844             else
 845               FATAL_ERROR ((0, 0, _("Invalid group given on option")));
 846           }
 847         break;
 848
 849       case MODE_OPTION:
 850         mode_option
 851           = mode_compile (optarg,
 852                           MODE_MASK_EQUALS | MODE_MASK_PLUS | MODE_MASK_MINUS);
 853         if (mode_option == MODE_INVALID)
 854           FATAL_ERROR ((0, 0, _("Invalid mode given on option")));
 855         if (mode_option == MODE_MEMORY_EXHAUSTED)
 856           FATAL_ERROR ((0, 0, _("Memory exhausted")));
 857         break;
 858
 859       case NO_RECURSE_OPTION:
 860         no_recurse_option = 1;
 861         break;
 862
 863       case NULL_OPTION:
 864         filename_terminator = '\0';
 865         break;
 866
 867       case OWNER_OPTION:
 868         if (! (strlen (optarg) < UNAME_FIELD_SIZE
 869                && uname_to_uid (optarg, &owner_option)))
 870           {
 871             uintmax_t u;
 872             if (xstrtoumax (optarg, (char **) 0, 10, &u, "") == LONGINT_OK
 873                 && u == (uid_t) u)
 874               owner_option = u;
 875             else
 876               FATAL_ERROR ((0, 0, _("Invalid owner given on option")));
 877           }
 878         break;
 879
 880       case POSIX_OPTION:
 881 #if OLDGNU_COMPATIBILITY
 882         if (archive_format == DEFAULT_FORMAT)
 883           archive_format = GNU_FORMAT;
 884         else if (archive_format != GNU_FORMAT)
 885           USAGE_ERROR ((0, 0, _("Conflicting archive format options")));
 886 #else
 887         if (archive_format == DEFAULT_FORMAT)
 888           archive_format = POSIX_FORMAT;
 889         else if (archive_format != POSIX_FORMAT)
 890           USAGE_ERROR ((0, 0, _("Conflicting archive format options")));
 891 #endif
 892         break;
 893
 894       case PRESERVE_OPTION:
 895         same_permissions_option = 1;
 896         same_order_option = 1;
 897         break;
 898
 899       case RECORD_SIZE_OPTION:
 900         {
 901           uintmax_t u;
 902           if (! (xstrtoumax (optarg, (char **) 0, 10, &u, "") == LONG_MAX
 903                  && u == (size_t) u))
 904             USAGE_ERROR ((0, 0, _("Invalid record size")));
 905           record_size = u;
 906           if (record_size % BLOCKSIZE != 0)
 907             USAGE_ERROR ((0, 0, _("Record size must be a multiple of %d."),
 908                           BLOCKSIZE));
 909           blocking_factor = record_size / BLOCKSIZE;
 910         }
 911         break;
 912
 913       case RSH_COMMAND_OPTION:
 914         rsh_command_option = optarg;
 915         break;
 916
 917       case SUFFIX_OPTION:
 918         backup_option = 1;
 919         backup_suffix_string = optarg;
 920         break;
 921
 922       case VOLNO_FILE_OPTION:
 923         volno_file_option = optarg;
 924         break;
 925
 926       case USE_COMPRESS_PROGRAM_OPTION:
 927         set_use_compress_program_option (optarg);
 928         break;
 929
 930       case '0':
 931       case '1':
 932       case '2':
 933       case '3':
 934       case '4':
 935       case '5':
 936       case '6':
 937       case '7':
 938
 939 #ifdef DEVICE_PREFIX
 940         {
 941           int device = optchar - '0';
 942           int density;
 943           static char buf[sizeof DEVICE_PREFIX + 10];
 944           char *cursor;
 945
 946           density = getopt_long (argc, argv, "lmh", NULL, NULL);
 947           strcpy (buf, DEVICE_PREFIX);
 948           cursor = buf + strlen (buf);
 949
 950 #ifdef DENSITY_LETTER
 951
 952           sprintf (cursor, "%d%c", device, density);
 953
 954 #else /* not DENSITY_LETTER */
 955
 956           switch (density)
 957             {
 958             case 'l':
 959 #ifdef LOW_NUM
 960               device += LOW_NUM;
 961 #endif
 962               break;
 963
 964             case 'm':
 965 #ifdef MID_NUM
 966               device += MID_NUM;
 967 #else
 968               device += 8;
 969 #endif
 970               break;
 971
 972             case 'h':
 973 #ifdef HGH_NUM
 974               device += HGH_NUM;
 975 #else
 976               device += 16;
 977 #endif
 978               break;
 979
 980             default:
 981               usage (TAREXIT_FAILURE);
 982             }
 983           sprintf (cursor, "%d", device);
 984
 985 #endif /* not DENSITY_LETTER */
 986
 987           if (archive_names == allocated_archive_names)
 988             {
 989               allocated_archive_names *= 2;
 990               archive_name_array = (const char **)
 991                 xrealloc (archive_name_array,
 992                           sizeof (const char *) * allocated_archive_names);
 993             }
 994           archive_name_array[archive_names++] = buf;
 995
 996           /* FIXME: How comes this works for many archives when buf is
 997              not xstrdup'ed?  */
 998         }
 999         break;
1000
1001 #else /* not DEVICE_PREFIX */
1002
1003         USAGE_ERROR ((0, 0,
1004                       _("Options `-[0-7][lmh]' not supported by *this* tar")));
1005
1006 #endif /* not DEVICE_PREFIX */
1007       }
1008
1009   /* Process trivial options.  */
1010
1011   if (show_version)
1012     {
1013       printf ("tar (GNU %s) %s\n", PACKAGE, VERSION);
1014       fputs (_("\
1015 \n\
1016 Copyright 1988, 92,93,94,95,96,97,98, 1999 Free Software Foundation, Inc.\n"),
1017              stdout);
1018       fputs (_("\
1019 This is free software; see the source for copying conditions.  There is NO\n\
1020 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"),
1021              stdout);
1022       fputs (_("\
1023 \n\
1024 Written by John Gilmore and Jay Fenlason.\n"),
1025              stdout);
1026       exit (TAREXIT_SUCCESS);
1027     }
1028
1029   if (show_help)
1030     usage (TAREXIT_SUCCESS);
1031
1032   /* Derive option values and check option consistency.  */
1033
1034   if (archive_format == DEFAULT_FORMAT)
1035     {
1036 #if OLDGNU_COMPATIBILITY
1037       archive_format = OLDGNU_FORMAT;
1038 #else
1039       archive_format = GNU_FORMAT;
1040 #endif
1041     }
1042
1043   if (archive_format == GNU_FORMAT && getenv ("POSIXLY_CORRECT"))
1044     archive_format = POSIX_FORMAT;
1045
1046   if ((volume_label_option != NULL
1047        || incremental_option || multi_volume_option || sparse_option)
1048       && archive_format != OLDGNU_FORMAT && archive_format != GNU_FORMAT)
1049     USAGE_ERROR ((0, 0,
1050                   _("GNU features wanted on incompatible archive format")));
1051
1052   if (archive_names == 0)
1053     {
1054       /* If no archive file name given, try TAPE from the environment, or
1055          else, DEFAULT_ARCHIVE from the configuration process.  */
1056
1057       archive_names = 1;
1058       archive_name_array[0] = getenv ("TAPE");
1059       if (archive_name_array[0] == NULL)
1060         archive_name_array[0] = DEFAULT_ARCHIVE;
1061     }
1062
1063   /* Allow multiple archives only with `-M'.  */
1064
1065   if (archive_names > 1 && !multi_volume_option)
1066     USAGE_ERROR ((0, 0,
1067                   _("Multiple archive files requires `-M' option")));
1068
1069   if (listed_incremental_option
1070       && newer_mtime_option != TYPE_MINIMUM (time_t))
1071     USAGE_ERROR ((0, 0,
1072                   _("Cannot combine --listed-incremental with --newer")));
1073
1074   /* If ready to unlink hierarchies, so we are for simpler files.  */
1075   if (recursive_unlink_option)
1076     unlink_first_option = 1;
1077
1078   /* Forbid using -c with no input files whatsoever.  Check that `-f -',
1079      explicit or implied, is used correctly.  */
1080
1081   switch (subcommand_option)
1082     {
1083     case CREATE_SUBCOMMAND:
1084       if (input_files == 0 && !files_from_option)
1085         USAGE_ERROR ((0, 0,
1086                       _("Cowardly refusing to create an empty archive")));
1087       break;
1088
1089     case EXTRACT_SUBCOMMAND:
1090     case LIST_SUBCOMMAND:
1091     case DIFF_SUBCOMMAND:
1092       for (archive_name_cursor = archive_name_array;
1093            archive_name_cursor < archive_name_array + archive_names;
1094            archive_name_cursor++)
1095         if (!strcmp (*archive_name_cursor, "-"))
1096           request_stdin ("-f");
1097       break;
1098
1099     case CAT_SUBCOMMAND:
1100     case UPDATE_SUBCOMMAND:
1101     case APPEND_SUBCOMMAND:
1102       for (archive_name_cursor = archive_name_array;
1103            archive_name_cursor < archive_name_array + archive_names;
1104            archive_name_cursor++)
1105         if (!strcmp (*archive_name_cursor, "-"))
1106           USAGE_ERROR ((0, 0,
1107                         _("Options `-Aru' are incompatible with `-f -'")));
1108
1109     default:
1110       break;
1111     }
1112
1113   archive_name_cursor = archive_name_array;
1114
1115   /* Prepare for generating backup names.  */
1116
1117   if (backup_suffix_string)
1118     simple_backup_suffix = xstrdup (backup_suffix_string);
1119
1120   if (backup_option)
1121     backup_type = xget_version ("--backup", version_control_string);
1122 }
1123 \f
1124 /* Tar proper.  */
1125
1126 /*-----------------------.
1127 | Main routine for tar.  |
1128 `-----------------------*/
1129
1130 int
1131 main (int argc, char *const *argv)
1132 {
1133   program_name = argv[0];
1134   setlocale (LC_ALL, "");
1135   bindtextdomain (PACKAGE, LOCALEDIR);
1136   textdomain (PACKAGE);
1137
1138   exit_status = TAREXIT_SUCCESS;
1139   filename_terminator = '\n';
1140
1141   /* Pre-allocate a few structures.  */
1142
1143   allocated_archive_names = 10;
1144   archive_name_array = (const char **)
1145     xmalloc (sizeof (const char *) * allocated_archive_names);
1146   archive_names = 0;
1147
1148 #ifdef SIGCHLD
1149   /* System V fork+wait does not work if SIGCHLD is ignored.  */
1150   signal (SIGCHLD, SIG_DFL);
1151 #endif
1152
1153   init_names ();
1154
1155   /* Decode options.  */
1156
1157   decode_options (argc, argv);
1158   name_init (argc, argv);
1159
1160   /* Main command execution.  */
1161
1162   if (volno_file_option)
1163     init_volume_number ();
1164
1165   switch (subcommand_option)
1166     {
1167     case UNKNOWN_SUBCOMMAND:
1168       USAGE_ERROR ((0, 0,
1169                     _("You must specify one of the `-Acdtrux' options")));
1170
1171     case CAT_SUBCOMMAND:
1172     case UPDATE_SUBCOMMAND:
1173     case APPEND_SUBCOMMAND:
1174       update_archive ();
1175       break;
1176
1177     case DELETE_SUBCOMMAND:
1178       delete_archive_members ();
1179       break;
1180
1181     case CREATE_SUBCOMMAND:
1182       create_archive ();
1183       name_close ();
1184
1185       if (totals_option)
1186         print_total_written ();
1187       break;
1188
1189     case EXTRACT_SUBCOMMAND:
1190       extr_init ();
1191       read_and (extract_archive);
1192       break;
1193
1194     case LIST_SUBCOMMAND:
1195       read_and (list_archive);
1196       break;
1197
1198     case DIFF_SUBCOMMAND:
1199       diff_init ();
1200       read_and (diff_archive);
1201       break;
1202     }
1203
1204   if (volno_file_option)
1205     closeout_volume_number ();
1206
1207   /* Dispose of allocated memory, and return.  */
1208
1209   free (archive_name_array);
1210   name_term ();
1211
1212   if (exit_status == TAREXIT_FAILURE)
1213     error (0, 0, _("Error exit delayed from previous errors"));
1214   exit (exit_status);
1215 }