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