Dogcows Code - chaz/tar/blob - src/common.h

   1 /* Common declarations for the tar program.
   2
   3    Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001,
   4    2003, 2004 Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 2, or (at your option) any later
   9    version.
  10
  11    This program is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  14    Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License along
  17    with this program; if not, write to the Free Software Foundation, Inc.,
  18    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* Declare the GNU tar archive format.  */
  21 #include "tar.h"
  22
  23 /* The checksum field is filled with this while the checksum is computed.  */
  24 #define CHKBLANKS       "        "      /* 8 blanks, no null */
  25
  26 /* Some constants from POSIX are given names.  */
  27 #define NAME_FIELD_SIZE   100
  28 #define PREFIX_FIELD_SIZE 155
  29 #define UNAME_FIELD_SIZE   32
  30 #define GNAME_FIELD_SIZE   32
  31
  32 /* FIXME */
  33 #define MAXOCTAL11      017777777777L
  34 #define MAXOCTAL7       07777777
  35
  36
  37 \f
  38 /* Some various global definitions.  */
  39
  40 /* Name of file to use for interacting with user.  */
  41 #if MSDOS
  42 # define TTY_NAME "con"
  43 #else
  44 # define TTY_NAME "/dev/tty"
  45 #endif
  46
  47 /* GLOBAL is defined to empty in tar.c only, and left alone in other *.c
  48    modules.  Here, we merely set it to "extern" if it is not already set.
  49    GNU tar does depend on the system loader to preset all GLOBAL variables to
  50    neutral (or zero) values, explicit initialization is usually not done.  */
  51 #ifndef GLOBAL
  52 # define GLOBAL extern
  53 #endif
  54
  55 /* Exit status for GNU tar.  Let's try to keep this list as simple as
  56    possible.  -d option strongly invites a status different for unequal
  57    comparison and other errors.  */
  58 GLOBAL int exit_status;
  59
  60 #define TAREXIT_SUCCESS 0
  61 #define TAREXIT_DIFFERS 1
  62 #define TAREXIT_FAILURE 2
  63
  64 /* Both WARN and ERROR write a message on stderr and continue processing,
  65    however ERROR manages so tar will exit unsuccessfully.  FATAL_ERROR
  66    writes a message on stderr and aborts immediately, with another message
  67    line telling so.  USAGE_ERROR works like FATAL_ERROR except that the
  68    other message line suggests trying --help.  All four macros accept a
  69    single argument of the form ((0, errno, _("FORMAT"), Args...)).  errno
  70    is zero when the error is not being detected by the system.  */
  71
  72 #define WARN(Args) \
  73   error Args
  74 #define ERROR(Args) \
  75   (error Args, exit_status = TAREXIT_FAILURE)
  76 #define FATAL_ERROR(Args) \
  77   (error Args, fatal_exit ())
  78 #define USAGE_ERROR(Args) \
  79   (error Args, usage (TAREXIT_FAILURE))
  80 \f
  81 #include "arith.h"
  82 #include <backupfile.h>
  83 #include <exclude.h>
  84 #include <full-write.h>
  85 #include <modechange.h>
  86 #include <quote.h>
  87 #include <safe-read.h>
  88 #include <timespec.h>
  89
  90 /* Log base 2 of common values.  */
  91 #define LG_8 3
  92 #define LG_64 6
  93 #define LG_256 8
  94 \f
  95 /* Information gleaned from the command line.  */
  96
  97 /* Name of this program.  */
  98 GLOBAL const char *program_name;
  99
 100 /* Main command option.  */
 101
 102 enum subcommand
 103 {
 104   UNKNOWN_SUBCOMMAND,           /* none of the following */
 105   APPEND_SUBCOMMAND,            /* -r */
 106   CAT_SUBCOMMAND,               /* -A */
 107   CREATE_SUBCOMMAND,            /* -c */
 108   DELETE_SUBCOMMAND,            /* -D */
 109   DIFF_SUBCOMMAND,              /* -d */
 110   EXTRACT_SUBCOMMAND,           /* -x */
 111   LIST_SUBCOMMAND,              /* -t */
 112   UPDATE_SUBCOMMAND             /* -u */
 113 };
 114
 115 GLOBAL enum subcommand subcommand_option;
 116
 117 /* Selected format for output archive.  */
 118 GLOBAL enum archive_format archive_format;
 119
 120 /* Either NL or NUL, as decided by the --null option.  */
 121 GLOBAL char filename_terminator;
 122
 123 /* Size of each record, once in blocks, once in bytes.  Those two variables
 124    are always related, the second being BLOCKSIZE times the first.  They do
 125    not have _option in their name, even if their values is derived from
 126    option decoding, as these are especially important in tar.  */
 127 GLOBAL int blocking_factor;
 128 GLOBAL size_t record_size;
 129
 130 GLOBAL bool absolute_names_option;
 131
 132 /* Display file times in UTC */
 133 GLOBAL bool utc_option;
 134
 135 /* This variable tells how to interpret newer_mtime_option, below.  If zero,
 136    files get archived if their mtime is not less than newer_mtime_option.
 137    If nonzero, files get archived if *either* their ctime or mtime is not less
 138    than newer_mtime_option.  */
 139 GLOBAL int after_date_option;
 140
 141 GLOBAL bool atime_preserve_option;
 142
 143 GLOBAL bool backup_option;
 144
 145 /* Type of backups being made.  */
 146 GLOBAL enum backup_type backup_type;
 147
 148 GLOBAL bool block_number_option;
 149
 150 GLOBAL bool checkpoint_option;
 151
 152 /* Specified name of compression program, or "gzip" as implied by -z.  */
 153 GLOBAL const char *use_compress_program_option;
 154
 155 GLOBAL bool dereference_option;
 156
 157 /* Print a message if not all links are dumped */
 158 GLOBAL int check_links_option;
 159
 160 /* Patterns that match file names to be excluded.  */
 161 GLOBAL struct exclude *excluded;
 162
 163 /* Specified file containing names to work on.  */
 164 GLOBAL const char *files_from_option;
 165
 166 GLOBAL bool force_local_option;
 167
 168 /* Specified value to be put into tar file in place of stat () results, or
 169    just -1 if such an override should not take place.  */
 170 GLOBAL gid_t group_option;
 171
 172 GLOBAL bool ignore_failed_read_option;
 173
 174 GLOBAL bool ignore_zeros_option;
 175
 176 GLOBAL bool incremental_option;
 177
 178 /* Specified name of script to run at end of each tape change.  */
 179 GLOBAL const char *info_script_option;
 180
 181 GLOBAL bool interactive_option;
 182
 183 /* If nonzero, extract only Nth occurrence of each named file */
 184 GLOBAL uintmax_t occurrence_option;
 185
 186 enum old_files
 187 {
 188   DEFAULT_OLD_FILES,          /* default */
 189   NO_OVERWRITE_DIR_OLD_FILES, /* --no-overwrite-dir */
 190   OVERWRITE_OLD_FILES,        /* --overwrite */
 191   UNLINK_FIRST_OLD_FILES,     /* --unlink-first */
 192   KEEP_OLD_FILES,             /* --keep-old-files */
 193   KEEP_NEWER_FILES            /* --keep-newer-files */
 194 };
 195 GLOBAL enum old_files old_files_option;
 196
 197 /* Specified file name for incremental list.  */
 198 GLOBAL const char *listed_incremental_option;
 199
 200 /* Specified mode change string.  */
 201 GLOBAL struct mode_change *mode_option;
 202
 203 GLOBAL bool multi_volume_option;
 204
 205 /* The same variable holds the time, whether mtime or ctime.  Just fake a
 206    non-existing option, for making the code clearer, elsewhere.  */
 207 #define newer_ctime_option newer_mtime_option
 208
 209 /* Specified threshold date and time.  Files having an older time stamp
 210    do not get archived (also see after_date_option above).  */
 211 GLOBAL struct timespec newer_mtime_option;
 212
 213 /* Return true if newer_mtime_option is initialized.  */
 214 #define NEWER_OPTION_INITIALIZED(opt) (0 <= (opt).tv_nsec)
 215
 216 /* Return true if the struct stat ST's M time is less than
 217    newer_mtime_option.  */
 218 #define OLDER_STAT_TIME(st, m) \
 219   ((st).st_##m##time < newer_mtime_option.tv_sec \
 220    || ((st).st_##m##time == newer_mtime_option.tv_sec \
 221        && TIMESPEC_NS ((st).st_##m##tim) < newer_mtime_option.tv_nsec))
 222
 223 /* Zero if there is no recursion, otherwise FNM_LEADING_DIR.  */
 224 GLOBAL int recursion_option;
 225
 226 GLOBAL bool numeric_owner_option;
 227
 228 GLOBAL bool one_file_system_option;
 229
 230 /* Specified value to be put into tar file in place of stat () results, or
 231    just -1 if such an override should not take place.  */
 232 GLOBAL uid_t owner_option;
 233
 234 GLOBAL bool recursive_unlink_option;
 235
 236 GLOBAL bool read_full_records_option;
 237
 238 GLOBAL bool remove_files_option;
 239
 240 /* Specified rmt command.  */
 241 GLOBAL const char *rmt_command_option;
 242
 243 /* Specified remote shell command.  */
 244 GLOBAL const char *rsh_command_option;
 245
 246 GLOBAL bool same_order_option;
 247
 248 /* If positive, preserve ownership when extracting.  */
 249 GLOBAL int same_owner_option;
 250
 251 /* If positive, preserve permissions when extracting.  */
 252 GLOBAL int same_permissions_option;
 253
 254 /* When set, strip the given number of file name components from the file name
 255    before extracting */
 256 GLOBAL size_t strip_name_components;
 257
 258 GLOBAL bool show_omitted_dirs_option;
 259
 260 GLOBAL bool sparse_option;
 261
 262 GLOBAL bool starting_file_option;
 263
 264 /* Specified maximum byte length of each tape volume (multiple of 1024).  */
 265 GLOBAL tarlong tape_length_option;
 266
 267 GLOBAL bool to_stdout_option;
 268
 269 GLOBAL bool totals_option;
 270
 271 GLOBAL bool touch_option;
 272
 273 /* Count how many times the option has been set, multiple setting yields
 274    more verbose behavior.  Value 0 means no verbosity, 1 means file name
 275    only, 2 means file name and all attributes.  More than 2 is just like 2.  */
 276 GLOBAL int verbose_option;
 277
 278 GLOBAL bool verify_option;
 279
 280 /* Specified name of file containing the volume number.  */
 281 GLOBAL const char *volno_file_option;
 282
 283 /* Specified value or pattern.  */
 284 GLOBAL const char *volume_label_option;
 285 \f
 286 /* Other global variables.  */
 287
 288 /* File descriptor for archive file.  */
 289 GLOBAL int archive;
 290
 291 /* Nonzero when outputting to /dev/null.  */
 292 GLOBAL bool dev_null_output;
 293
 294 /* Timestamp for when we started execution.  */
 295 #if HAVE_CLOCK_GETTIME
 296   GLOBAL struct timespec start_timespec;
 297 # define start_time (start_timespec.tv_sec)
 298 #else
 299   GLOBAL time_t start_time;
 300 #endif
 301
 302 GLOBAL struct tar_stat_info current_stat_info;
 303
 304 /* List of tape drive names, number of such tape drives, allocated number,
 305    and current cursor in list.  */
 306 GLOBAL const char **archive_name_array;
 307 GLOBAL int archive_names;
 308 GLOBAL int allocated_archive_names;
 309 GLOBAL const char **archive_name_cursor;
 310
 311 /* Output index file name.  */
 312 GLOBAL char const *index_file_name;
 313
 314 /* Structure for keeping track of filenames and lists thereof.  */
 315 struct name
 316   {
 317     struct name *next;
 318     size_t length;              /* cached strlen(name) */
 319     uintmax_t found_count;      /* number of times a matching file has
 320                                    been found */
 321     int isdir;
 322     char firstch;               /* first char is literally matched */
 323     char regexp;                /* this name is a regexp, not literal */
 324     int change_dir;             /* set with the -C option */
 325     char const *dir_contents;   /* for incremental_option */
 326     char fake;                  /* dummy entry */
 327     char name[1];
 328   };
 329
 330 /* Obnoxious test to see if dimwit is trying to dump the archive.  */
 331 GLOBAL dev_t ar_dev;
 332 GLOBAL ino_t ar_ino;
 333
 334 GLOBAL bool seekable_archive;
 335
 336 \f
 337 /* Declarations for each module.  */
 338
 339 /* FIXME: compare.c should not directly handle the following variable,
 340    instead, this should be done in buffer.c only.  */
 341
 342 enum access_mode
 343 {
 344   ACCESS_READ,
 345   ACCESS_WRITE,
 346   ACCESS_UPDATE
 347 };
 348 extern enum access_mode access_mode;
 349
 350 /* Module buffer.c.  */
 351
 352 extern FILE *stdlis;
 353 extern char *save_name;
 354 extern off_t save_sizeleft;
 355 extern off_t save_totsize;
 356 extern bool write_archive_to_stdout;
 357
 358 size_t available_space_after (union block *);
 359 off_t current_block_ordinal (void);
 360 void close_archive (void);
 361 void closeout_volume_number (void);
 362 union block *find_next_block (void);
 363 void flush_read (void);
 364 void flush_write (void);
 365 void flush_archive (void);
 366 void init_volume_number (void);
 367 void open_archive (enum access_mode);
 368 void print_total_written (void);
 369 void reset_eof (void);
 370 void set_next_block_after (union block *);
 371 void clear_read_error_count (void);
 372 void xclose (int fd);
 373 void archive_write_error (ssize_t) __attribute__ ((noreturn));
 374 void archive_read_error (void);
 375 off_t seek_archive (off_t size);
 376
 377 /* Module create.c.  */
 378
 379 enum dump_status
 380   {
 381     dump_status_ok,
 382     dump_status_short,
 383     dump_status_fail,
 384     dump_status_not_implemented
 385   };
 386
 387 bool file_dumpable_p (struct tar_stat_info *);
 388 void create_archive (void);
 389 void pad_archive (off_t size_left);
 390 void dump_file (char *, int, dev_t);
 391 union block *start_header (struct tar_stat_info *st);
 392 void finish_header (struct tar_stat_info *, union block *, off_t);
 393 void simple_finish_header (union block *header);
 394 union block *start_private_header (const char *name, size_t size);
 395 void write_eot (void);
 396 void check_links (void);
 397
 398 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
 399 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
 400 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
 401 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
 402 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
 403 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
 404 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
 405 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
 406 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
 407 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 408 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 409
 410 void gid_to_chars (gid_t, char *, size_t);
 411 void major_to_chars (major_t, char *, size_t);
 412 void minor_to_chars (minor_t, char *, size_t);
 413 void mode_to_chars (mode_t, char *, size_t);
 414 void off_to_chars (off_t, char *, size_t);
 415 void size_to_chars (size_t, char *, size_t);
 416 void time_to_chars (time_t, char *, size_t);
 417 void uid_to_chars (uid_t, char *, size_t);
 418 void uintmax_to_chars (uintmax_t, char *, size_t);
 419 void string_to_chars (char *, char *, size_t);
 420
 421 /* Module diffarch.c.  */
 422
 423 extern bool now_verifying;
 424
 425 void diff_archive (void);
 426 void diff_init (void);
 427 void verify_volume (void);
 428
 429 /* Module extract.c.  */
 430
 431 extern bool we_are_root;
 432 void extr_init (void);
 433 void extract_archive (void);
 434 void extract_finish (void);
 435 void fatal_exit (void) __attribute__ ((noreturn));
 436
 437 /* Module delete.c.  */
 438
 439 void delete_archive_members (void);
 440
 441 /* Module incremen.c.  */
 442
 443 char *get_directory_contents (char *, dev_t);
 444 void read_directory_file (void);
 445 void write_directory_file (void);
 446 void gnu_restore (char const *);
 447
 448 /* Module list.c.  */
 449
 450 enum read_header
 451 {
 452   HEADER_STILL_UNREAD,          /* for when read_header has not been called */
 453   HEADER_SUCCESS,               /* header successfully read and checksummed */
 454   HEADER_SUCCESS_EXTENDED,      /* likewise, but we got an extended header */
 455   HEADER_ZERO_BLOCK,            /* zero block where header expected */
 456   HEADER_END_OF_FILE,           /* true end of file while header expected */
 457   HEADER_FAILURE                /* ill-formed header, or bad checksum */
 458 };
 459
 460 struct xheader
 461 {
 462   struct obstack *stk;
 463   size_t size;
 464   char *buffer;
 465 };
 466
 467 GLOBAL struct xheader extended_header;
 468 extern union block *current_header;
 469 extern enum archive_format current_format;
 470 extern size_t recent_long_name_blocks;
 471 extern size_t recent_long_link_blocks;
 472
 473 void decode_header (union block *, struct tar_stat_info *,
 474                     enum archive_format *, int);
 475 #define STRINGIFY_BIGINT(i, b) \
 476   stringify_uintmax_t_backwards ((uintmax_t) (i), (b) + UINTMAX_STRSIZE_BOUND)
 477 char *stringify_uintmax_t_backwards (uintmax_t, char *);
 478 char const *tartime (time_t);
 479
 480 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
 481 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
 482 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
 483 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
 484 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
 485 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
 486 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
 487 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
 488 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
 489
 490 gid_t gid_from_header (const char *, size_t);
 491 major_t major_from_header (const char *, size_t);
 492 minor_t minor_from_header (const char *, size_t);
 493 mode_t mode_from_header (const char *, size_t);
 494 off_t off_from_header (const char *, size_t);
 495 size_t size_from_header (const char *, size_t);
 496 time_t time_from_header (const char *, size_t);
 497 uid_t uid_from_header (const char *, size_t);
 498 uintmax_t uintmax_from_header (const char *, size_t);
 499
 500 void list_archive (void);
 501 void print_for_mkdir (char *, int, mode_t);
 502 void print_header (struct tar_stat_info *, off_t);
 503 void read_and (void (*) (void));
 504 enum read_header read_header (bool);
 505 void skip_file (off_t);
 506 void skip_member (void);
 507
 508 /* Module mangle.c.  */
 509
 510 void extract_mangle (void);
 511
 512 /* Module misc.c.  */
 513
 514 void assign_string (char **, const char *);
 515 char *quote_copy_string (const char *);
 516 int unquote_string (char *);
 517
 518 size_t dot_dot_prefix_len (char const *);
 519
 520 enum remove_option
 521 {
 522   ORDINARY_REMOVE_OPTION,
 523   RECURSIVE_REMOVE_OPTION,
 524   WANT_DIRECTORY_REMOVE_OPTION
 525 };
 526 int remove_any_file (const char *, enum remove_option);
 527 bool maybe_backup_file (const char *, int);
 528 void undo_last_backup (void);
 529
 530 int deref_stat (bool, char const *, struct stat *);
 531
 532 int chdir_arg (char const *);
 533 void chdir_do (int);
 534
 535 void decode_mode (mode_t, char *);
 536
 537 void chdir_fatal (char const *) __attribute__ ((noreturn));
 538 void chmod_error_details (char const *, mode_t);
 539 void chown_error_details (char const *, uid_t, gid_t);
 540 void close_error (char const *);
 541 void close_warn (char const *);
 542 void close_diag (char const *name);
 543 void exec_fatal (char const *) __attribute__ ((noreturn));
 544 void link_error (char const *, char const *);
 545 void mkdir_error (char const *);
 546 void mkfifo_error (char const *);
 547 void mknod_error (char const *);
 548 void open_error (char const *);
 549 void open_fatal (char const *) __attribute__ ((noreturn));
 550 void open_warn (char const *);
 551 void open_diag (char const *name);
 552 void read_error (char const *);
 553 void read_error_details (char const *, off_t, size_t);
 554 void read_fatal (char const *) __attribute__ ((noreturn));
 555 void read_fatal_details (char const *, off_t, size_t) __attribute__ ((noreturn));
 556 void read_warn_details (char const *, off_t, size_t);
 557 void read_diag_details (char const *name, off_t offset, size_t size);
 558 void readlink_error (char const *);
 559 void readlink_warn (char const *);
 560 void readlink_diag (char const *name);
 561 void savedir_error (char const *);
 562 void savedir_warn (char const *);
 563 void savedir_diag (char const *name);
 564 void seek_error (char const *);
 565 void seek_error_details (char const *, off_t);
 566 void seek_warn (char const *);
 567 void seek_warn_details (char const *, off_t);
 568 void seek_diag_details (char const *, off_t);
 569 void stat_error (char const *);
 570 void stat_warn (char const *);
 571 void stat_diag (char const *name);
 572 void symlink_error (char const *, char const *);
 573 void truncate_error (char const *);
 574 void truncate_warn (char const *);
 575 void unlink_error (char const *);
 576 void utime_error (char const *);
 577 void waitpid_error (char const *);
 578 void write_error (char const *);
 579 void write_error_details (char const *, size_t, size_t);
 580 void write_fatal (char const *) __attribute__ ((noreturn));
 581 void write_fatal_details (char const *, ssize_t, size_t)
 582      __attribute__ ((noreturn));
 583
 584 pid_t xfork (void);
 585 void xpipe (int[2]);
 586
 587 /* Module names.c.  */
 588
 589 extern struct name *gnu_list_name;
 590
 591 void gid_to_gname (gid_t, char **gname);
 592 int gname_to_gid (char const *, gid_t *);
 593 void uid_to_uname (uid_t, char **uname);
 594 int uname_to_uid (char const *, uid_t *);
 595
 596 void init_names (void);
 597 void name_add (const char *);
 598 void name_init (void);
 599 void name_term (void);
 600 char *name_next (int);
 601 void name_close (void);
 602 void name_gather (void);
 603 struct name *addname (char const *, int);
 604 int name_match (const char *);
 605 void names_notfound (void);
 606 void collect_and_sort_names (void);
 607 struct name *name_scan (const char *);
 608 char *name_from_list (void);
 609 void blank_name_list (void);
 610 char *new_name (const char *, const char *);
 611 char *safer_name_suffix (char const *, bool);
 612 size_t stripped_prefix_len (char const *file_name, size_t num);
 613 bool all_names_found (struct tar_stat_info *);
 614
 615 bool excluded_name (char const *);
 616
 617 void add_avoided_name (char const *);
 618 bool is_avoided_name (char const *);
 619
 620 bool contains_dot_dot (char const *);
 621
 622 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 623                     (c)->found_count == occurrence_option)
 624 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 625                      (c)->found_count >= occurrence_option)
 626
 627 /* Module tar.c.  */
 628
 629 void usage (int);
 630
 631 int confirm (const char *, const char *);
 632 void request_stdin (const char *);
 633
 634 void tar_stat_init (struct tar_stat_info *st);
 635 void tar_stat_destroy (struct tar_stat_info *st);
 636 void usage (int) __attribute__ ((noreturn));
 637
 638 /* Module update.c.  */
 639
 640 extern char *output_start;
 641
 642 void update_archive (void);
 643
 644 /* Module xheader.c.  */
 645
 646 void xheader_decode (struct tar_stat_info *);
 647 void xheader_decode_global (void);
 648 void xheader_store (char const *, struct tar_stat_info const *, void *);
 649 void xheader_read (union block *, size_t);
 650 void xheader_write (char type, char *name, struct xheader *xhdr);
 651 void xheader_write_global (void);
 652 void xheader_finish (struct xheader *);
 653 void xheader_destroy (struct xheader *);
 654 char *xheader_xhdr_name (struct tar_stat_info *st);
 655 char *xheader_ghdr_name (void);
 656 void xheader_write (char, char *, struct xheader *);
 657 void xheader_write_global (void);
 658 void xheader_set_option (char *string);
 659
 660 /* Module system.c */
 661
 662 void sys_stat_nanoseconds (struct tar_stat_info *);
 663 void sys_detect_dev_null_output (void);
 664 void sys_save_archive_dev_ino (void);
 665 void sys_drain_input_pipe (void);
 666 void sys_wait_for_child (pid_t);
 667 void sys_spawn_shell (void);
 668 bool sys_compare_uid (struct stat *a, struct stat *b);
 669 bool sys_compare_gid (struct stat *a, struct stat *b);
 670 bool sys_file_is_archive (struct tar_stat_info *p);
 671 bool sys_compare_links (struct stat *link_data, struct stat *stat_data);
 672 int sys_truncate (int fd);
 673 void sys_reset_uid_gid (void);
 674 pid_t sys_child_open_for_compress (void);
 675 pid_t sys_child_open_for_uncompress (void);
 676 void sys_reset_uid_gid (void);
 677 size_t sys_write_archive_buffer (void);
 678 bool sys_get_archive_stat (void);
 679 void sys_reset_uid_gid (void);
 680
 681 /* Module compare.c */
 682 void report_difference (struct tar_stat_info *st, const char *message, ...);
 683
 684 /* Module sparse.c */
 685 bool sparse_file_p (struct tar_stat_info *);
 686 bool sparse_member_p (struct tar_stat_info *);
 687 bool sparse_fixup_header (struct tar_stat_info *);
 688 enum dump_status sparse_dump_file (int, struct tar_stat_info *);
 689 enum dump_status sparse_extract_file (int, struct tar_stat_info *, off_t *);
 690 enum dump_status sparse_skip_file (struct tar_stat_info *);
 691 bool sparse_diff_file (int, struct tar_stat_info *);
 692
 693 /* Module utf8.c */
 694 bool string_ascii_p (const char *str);
 695 bool utf8_convert (bool to_utf, char const *input, char **output);