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, 2005, 2006 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    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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
  33 \f
  34 /* Some various global definitions.  */
  35
  36 /* Name of file to use for interacting with user.  */
  37
  38 /* GLOBAL is defined to empty in tar.c only, and left alone in other *.c
  39    modules.  Here, we merely set it to "extern" if it is not already set.
  40    GNU tar does depend on the system loader to preset all GLOBAL variables to
  41    neutral (or zero) values, explicit initialization is usually not done.  */
  42 #ifndef GLOBAL
  43 # define GLOBAL extern
  44 #endif
  45
  46 #define TAREXIT_SUCCESS PAXEXIT_SUCCESS
  47 #define TAREXIT_DIFFERS PAXEXIT_DIFFERS
  48 #define TAREXIT_FAILURE PAXEXIT_FAILURE
  49
  50 \f
  51 #include "arith.h"
  52 #include <backupfile.h>
  53 #include <exclude.h>
  54 #include <full-write.h>
  55 #include <modechange.h>
  56 #include <quote.h>
  57 #include <safe-read.h>
  58 #include <stat-time.h>
  59 #include <timespec.h>
  60 #define obstack_chunk_alloc xmalloc
  61 #define obstack_chunk_free free
  62 #include <obstack.h>
  63
  64 #include <paxlib.h>
  65
  66 /* Log base 2 of common values.  */
  67 #define LG_8 3
  68 #define LG_64 6
  69 #define LG_256 8
  70 \f
  71 /* Information gleaned from the command line.  */
  72
  73 /* Name of this program.  */
  74 GLOBAL const char *program_name;
  75
  76 /* Main command option.  */
  77
  78 enum subcommand
  79 {
  80   UNKNOWN_SUBCOMMAND,           /* none of the following */
  81   APPEND_SUBCOMMAND,            /* -r */
  82   CAT_SUBCOMMAND,               /* -A */
  83   CREATE_SUBCOMMAND,            /* -c */
  84   DELETE_SUBCOMMAND,            /* -D */
  85   DIFF_SUBCOMMAND,              /* -d */
  86   EXTRACT_SUBCOMMAND,           /* -x */
  87   LIST_SUBCOMMAND,              /* -t */
  88   UPDATE_SUBCOMMAND             /* -u */
  89 };
  90
  91 GLOBAL enum subcommand subcommand_option;
  92
  93 /* Selected format for output archive.  */
  94 GLOBAL enum archive_format archive_format;
  95
  96 /* Either NL or NUL, as decided by the --null option.  */
  97 GLOBAL char filename_terminator;
  98
  99 /* Size of each record, once in blocks, once in bytes.  Those two variables
 100    are always related, the second being BLOCKSIZE times the first.  They do
 101    not have _option in their name, even if their values is derived from
 102    option decoding, as these are especially important in tar.  */
 103 GLOBAL int blocking_factor;
 104 GLOBAL size_t record_size;
 105
 106 GLOBAL bool absolute_names_option;
 107
 108 /* Display file times in UTC */
 109 GLOBAL bool utc_option;
 110
 111 /* This variable tells how to interpret newer_mtime_option, below.  If zero,
 112    files get archived if their mtime is not less than newer_mtime_option.
 113    If nonzero, files get archived if *either* their ctime or mtime is not less
 114    than newer_mtime_option.  */
 115 GLOBAL int after_date_option;
 116
 117 enum atime_preserve
 118 {
 119   no_atime_preserve,
 120   replace_atime_preserve,
 121   system_atime_preserve
 122 };
 123 GLOBAL enum atime_preserve atime_preserve_option;
 124
 125 GLOBAL bool backup_option;
 126
 127 /* Type of backups being made.  */
 128 GLOBAL enum backup_type backup_type;
 129
 130 GLOBAL bool block_number_option;
 131
 132 GLOBAL bool checkpoint_option;
 133
 134 /* Specified name of compression program, or "gzip" as implied by -z.  */
 135 GLOBAL const char *use_compress_program_option;
 136
 137 GLOBAL bool dereference_option;
 138
 139 /* Print a message if not all links are dumped */
 140 GLOBAL int check_links_option;
 141
 142 /* Patterns that match file names to be excluded.  */
 143 GLOBAL struct exclude *excluded;
 144
 145 /* Exclude directories containing a cache directory tag. */
 146 GLOBAL bool exclude_caches_option;
 147
 148 /* Specified value to be put into tar file in place of stat () results, or
 149    just -1 if such an override should not take place.  */
 150 GLOBAL gid_t group_option;
 151
 152 GLOBAL bool ignore_failed_read_option;
 153
 154 GLOBAL bool ignore_zeros_option;
 155
 156 GLOBAL bool incremental_option;
 157
 158 /* Specified name of script to run at end of each tape change.  */
 159 GLOBAL const char *info_script_option;
 160
 161 GLOBAL bool interactive_option;
 162
 163 /* If nonzero, extract only Nth occurrence of each named file */
 164 GLOBAL uintmax_t occurrence_option;
 165
 166 enum old_files
 167 {
 168   DEFAULT_OLD_FILES,          /* default */
 169   NO_OVERWRITE_DIR_OLD_FILES, /* --no-overwrite-dir */
 170   OVERWRITE_OLD_FILES,        /* --overwrite */
 171   UNLINK_FIRST_OLD_FILES,     /* --unlink-first */
 172   KEEP_OLD_FILES,             /* --keep-old-files */
 173   KEEP_NEWER_FILES            /* --keep-newer-files */
 174 };
 175 GLOBAL enum old_files old_files_option;
 176
 177 /* Specified file name for incremental list.  */
 178 GLOBAL const char *listed_incremental_option;
 179
 180 /* Specified mode change string.  */
 181 GLOBAL struct mode_change *mode_option;
 182
 183 /* Initial umask, if needed for mode change string.  */
 184 GLOBAL mode_t initial_umask;
 185
 186 GLOBAL bool multi_volume_option;
 187
 188 /* Specified threshold date and time.  Files having an older time stamp
 189    do not get archived (also see after_date_option above).  */
 190 GLOBAL struct timespec newer_mtime_option;
 191
 192 /* Return true if newer_mtime_option is initialized.  */
 193 #define NEWER_OPTION_INITIALIZED(opt) (0 <= (opt).tv_nsec)
 194
 195 /* Return true if the struct stat ST's M time is less than
 196    newer_mtime_option.  */
 197 #define OLDER_STAT_TIME(st, m) \
 198   (timespec_cmp (get_stat_##m##time (&(st)), newer_mtime_option) < 0)
 199
 200 /* Likewise, for struct tar_stat_info ST.  */
 201 #define OLDER_TAR_STAT_TIME(st, m) \
 202   (timespec_cmp ((st).m##time, newer_mtime_option) < 0)
 203
 204 /* Zero if there is no recursion, otherwise FNM_LEADING_DIR.  */
 205 GLOBAL int recursion_option;
 206
 207 GLOBAL bool numeric_owner_option;
 208
 209 GLOBAL bool one_file_system_option;
 210
 211 /* Specified value to be put into tar file in place of stat () results, or
 212    just -1 if such an override should not take place.  */
 213 GLOBAL uid_t owner_option;
 214
 215 GLOBAL bool recursive_unlink_option;
 216
 217 GLOBAL bool read_full_records_option;
 218
 219 GLOBAL bool remove_files_option;
 220
 221 /* Specified rmt command.  */
 222 GLOBAL const char *rmt_command_option;
 223
 224 /* Specified remote shell command.  */
 225 GLOBAL const char *rsh_command_option;
 226
 227 GLOBAL bool same_order_option;
 228
 229 /* If positive, preserve ownership when extracting.  */
 230 GLOBAL int same_owner_option;
 231
 232 /* If positive, preserve permissions when extracting.  */
 233 GLOBAL int same_permissions_option;
 234
 235 /* When set, strip the given number of file name components from the file name
 236    before extracting */
 237 GLOBAL size_t strip_name_components;
 238
 239 GLOBAL bool show_omitted_dirs_option;
 240
 241 GLOBAL bool sparse_option;
 242
 243 GLOBAL bool starting_file_option;
 244
 245 /* Specified maximum byte length of each tape volume (multiple of 1024).  */
 246 GLOBAL tarlong tape_length_option;
 247
 248 GLOBAL bool to_stdout_option;
 249
 250 GLOBAL bool totals_option;
 251
 252 GLOBAL bool touch_option;
 253
 254 GLOBAL char *to_command_option;
 255 GLOBAL bool ignore_command_error_option;
 256
 257 /* Restrict some potentially harmful tar options */
 258 GLOBAL bool restrict_option;
 259
 260 /* Return true if the extracted files are not being written to disk */
 261 #define EXTRACT_OVER_PIPE (to_stdout_option || to_command_option)
 262
 263 /* Count how many times the option has been set, multiple setting yields
 264    more verbose behavior.  Value 0 means no verbosity, 1 means file name
 265    only, 2 means file name and all attributes.  More than 2 is just like 2.  */
 266 GLOBAL int verbose_option;
 267
 268 GLOBAL bool verify_option;
 269
 270 /* Specified name of file containing the volume number.  */
 271 GLOBAL const char *volno_file_option;
 272
 273 /* Specified value or pattern.  */
 274 GLOBAL const char *volume_label_option;
 275 \f
 276 /* Other global variables.  */
 277
 278 /* File descriptor for archive file.  */
 279 GLOBAL int archive;
 280
 281 /* Nonzero when outputting to /dev/null.  */
 282 GLOBAL bool dev_null_output;
 283
 284 /* Timestamp for when we started execution.  */
 285 GLOBAL struct timespec start_time;
 286
 287 GLOBAL struct tar_stat_info current_stat_info;
 288
 289 /* List of tape drive names, number of such tape drives, allocated number,
 290    and current cursor in list.  */
 291 GLOBAL const char **archive_name_array;
 292 GLOBAL size_t archive_names;
 293 GLOBAL size_t allocated_archive_names;
 294 GLOBAL const char **archive_name_cursor;
 295
 296 /* Output index file name.  */
 297 GLOBAL char const *index_file_name;
 298
 299 /* Structure for keeping track of filenames and lists thereof.  */
 300 struct name
 301   {
 302     struct name *next;          /* Link to the next element */
 303     int change_dir;             /* Number of the directory to change to.
 304                                    Set with the -C option. */
 305     uintmax_t found_count;      /* number of times a matching file has
 306                                    been found */
 307     int explicit;               /* this name was explicitely given in the
 308                                    command line */
 309     int matching_flags;         /* this name is a regexp, not literal */
 310     char const *dir_contents;   /* for incremental_option */
 311
 312     size_t length;              /* cached strlen(name) */
 313     char name[1];
 314   };
 315
 316 /* Obnoxious test to see if dimwit is trying to dump the archive.  */
 317 GLOBAL dev_t ar_dev;
 318 GLOBAL ino_t ar_ino;
 319
 320 GLOBAL bool seekable_archive;
 321
 322 GLOBAL dev_t root_device;
 323
 324 /* Unquote filenames */
 325 GLOBAL bool unquote_option;
 326
 327 GLOBAL bool test_label_option; /* Test archive volume label and exit */
 328
 329 /* Show file or archive names after transformation.
 330    In particular, when creating archive in verbose mode, list member names
 331    as stored in the archive */
 332 GLOBAL bool show_transformed_names_option;
 333
 334 /* Delay setting modification times and permissions of extracted directories
 335    until the end of extraction. This variable helps correctly restore directory
 336    timestamps from archives with an unusual member order. It is automatically
 337    set for incremental archives. */
 338 GLOBAL bool delay_directory_restore_option;
 339
 340 /* Warn about implicit use of the wildcards in command line arguments.
 341    (Default for tar prior to 1.15.91, but changed afterwards */
 342 GLOBAL bool warn_regex_usage;
 343 \f
 344 /* Declarations for each module.  */
 345
 346 /* FIXME: compare.c should not directly handle the following variable,
 347    instead, this should be done in buffer.c only.  */
 348
 349 enum access_mode
 350 {
 351   ACCESS_READ,
 352   ACCESS_WRITE,
 353   ACCESS_UPDATE
 354 };
 355 extern enum access_mode access_mode;
 356
 357 /* Module buffer.c.  */
 358
 359 extern FILE *stdlis;
 360 extern bool write_archive_to_stdout;
 361 extern char *volume_label;
 362 extern char *continued_file_name;
 363 extern uintmax_t continued_file_size;
 364 extern uintmax_t continued_file_offset;
 365
 366 size_t available_space_after (union block *);
 367 off_t current_block_ordinal (void);
 368 void close_archive (void);
 369 void closeout_volume_number (void);
 370 union block *find_next_block (void);
 371 void flush_read (void);
 372 void flush_write (void);
 373 void flush_archive (void);
 374 void init_volume_number (void);
 375 void open_archive (enum access_mode);
 376 void print_total_written (void);
 377 void reset_eof (void);
 378 void set_next_block_after (union block *);
 379 void clear_read_error_count (void);
 380 void xclose (int fd);
 381 void archive_write_error (ssize_t) __attribute__ ((noreturn));
 382 void archive_read_error (void);
 383 off_t seek_archive (off_t size);
 384 void set_start_time (void);
 385
 386 void mv_begin (struct tar_stat_info *st);
 387 void mv_end (void);
 388 void mv_total_size (off_t size);
 389 void mv_size_left (off_t size);
 390
 391
 392 /* Module create.c.  */
 393
 394 enum dump_status
 395   {
 396     dump_status_ok,
 397     dump_status_short,
 398     dump_status_fail,
 399     dump_status_not_implemented
 400   };
 401
 402 bool file_dumpable_p (struct tar_stat_info *);
 403 void create_archive (void);
 404 void pad_archive (off_t size_left);
 405 void dump_file (const char *, int, dev_t);
 406 union block *start_header (struct tar_stat_info *st);
 407 void finish_header (struct tar_stat_info *, union block *, off_t);
 408 void simple_finish_header (union block *header);
 409 union block * write_extended (bool global, struct tar_stat_info *st,
 410                               union block *old_header);
 411 union block *start_private_header (const char *name, size_t size);
 412 void write_eot (void);
 413 void check_links (void);
 414
 415 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
 416 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
 417 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
 418 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
 419 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
 420 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
 421 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
 422 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
 423 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
 424 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 425 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 426
 427 bool gid_to_chars (gid_t, char *, size_t);
 428 bool major_to_chars (major_t, char *, size_t);
 429 bool minor_to_chars (minor_t, char *, size_t);
 430 bool mode_to_chars (mode_t, char *, size_t);
 431 bool off_to_chars (off_t, char *, size_t);
 432 bool size_to_chars (size_t, char *, size_t);
 433 bool time_to_chars (time_t, char *, size_t);
 434 bool uid_to_chars (uid_t, char *, size_t);
 435 bool uintmax_to_chars (uintmax_t, char *, size_t);
 436 void string_to_chars (char const *, char *, size_t);
 437
 438 /* Module diffarch.c.  */
 439
 440 extern bool now_verifying;
 441
 442 void diff_archive (void);
 443 void diff_init (void);
 444 void verify_volume (void);
 445
 446 /* Module extract.c.  */
 447
 448 void extr_init (void);
 449 void extract_archive (void);
 450 void extract_finish (void);
 451 bool rename_directory (char *src, char *dst);
 452
 453 /* Module delete.c.  */
 454
 455 void delete_archive_members (void);
 456
 457 /* Module incremen.c.  */
 458
 459 char *get_directory_contents (char *, dev_t);
 460 const char *append_incremental_renames (const char *dump);
 461 void read_directory_file (void);
 462 void write_directory_file (void);
 463 void purge_directory (char const *);
 464 void list_dumpdir (char *buffer, size_t size);
 465 void update_parent_directory (const char *name);
 466
 467 size_t dumpdir_size (const char *p);
 468 bool is_dumpdir (struct tar_stat_info *stat_info);
 469
 470 /* Module list.c.  */
 471
 472 enum read_header
 473 {
 474   HEADER_STILL_UNREAD,          /* for when read_header has not been called */
 475   HEADER_SUCCESS,               /* header successfully read and checksummed */
 476   HEADER_SUCCESS_EXTENDED,      /* likewise, but we got an extended header */
 477   HEADER_ZERO_BLOCK,            /* zero block where header expected */
 478   HEADER_END_OF_FILE,           /* true end of file while header expected */
 479   HEADER_FAILURE                /* ill-formed header, or bad checksum */
 480 };
 481
 482 struct xheader
 483 {
 484   struct obstack *stk;
 485   size_t size;
 486   char *buffer;
 487 };
 488
 489 GLOBAL struct xheader extended_header;
 490 extern union block *current_header;
 491 extern enum archive_format current_format;
 492 extern size_t recent_long_name_blocks;
 493 extern size_t recent_long_link_blocks;
 494
 495 void decode_header (union block *, struct tar_stat_info *,
 496                     enum archive_format *, int);
 497 char const *tartime (struct timespec, bool);
 498
 499 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
 500 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
 501 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
 502 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
 503 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
 504 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
 505 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
 506 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
 507 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
 508
 509 gid_t gid_from_header (const char *, size_t);
 510 major_t major_from_header (const char *, size_t);
 511 minor_t minor_from_header (const char *, size_t);
 512 mode_t mode_from_header (const char *, size_t);
 513 off_t off_from_header (const char *, size_t);
 514 size_t size_from_header (const char *, size_t);
 515 time_t time_from_header (const char *, size_t);
 516 uid_t uid_from_header (const char *, size_t);
 517 uintmax_t uintmax_from_header (const char *, size_t);
 518
 519 void list_archive (void);
 520 void print_for_mkdir (char *, int, mode_t);
 521 void print_header (struct tar_stat_info *, off_t);
 522 void read_and (void (*) (void));
 523 enum read_header read_header_primitive (bool raw_extended_headers,
 524                                         struct tar_stat_info *info);
 525 enum read_header read_header (bool);
 526 enum read_header tar_checksum (union block *header, bool silent);
 527 void skip_file (off_t);
 528 void skip_member (void);
 529
 530 /* Module mangle.c.  */
 531
 532 void extract_mangle (void);
 533
 534 /* Module misc.c.  */
 535
 536 void assign_string (char **, const char *);
 537 char *quote_copy_string (const char *);
 538 int unquote_string (char *);
 539
 540 void code_ns_fraction (int, char *);
 541 char const *code_timespec (struct timespec, char *);
 542 enum { BILLION = 1000000000, LOG10_BILLION = 9 };
 543 enum { TIMESPEC_STRSIZE_BOUND =
 544          UINTMAX_STRSIZE_BOUND + LOG10_BILLION + sizeof "-." - 1 };
 545
 546 size_t dot_dot_prefix_len (char const *);
 547
 548 enum remove_option
 549 {
 550   ORDINARY_REMOVE_OPTION,
 551   RECURSIVE_REMOVE_OPTION,
 552
 553   /* FIXME: The following value is never used. It seems to be intended
 554      as a placeholder for a hypothetical option that should instruct tar
 555      to recursively remove subdirectories in purge_directory(),
 556      as opposed to the functionality of --recursive-unlink
 557      (RECURSIVE_REMOVE_OPTION value), which removes them in
 558      prepare_to_extract() phase. However, with the addition of more
 559      meta-info to the incremental dumps, this should become unnecessary */
 560   WANT_DIRECTORY_REMOVE_OPTION
 561 };
 562 int remove_any_file (const char *, enum remove_option);
 563 bool maybe_backup_file (const char *, int);
 564 void undo_last_backup (void);
 565
 566 int deref_stat (bool, char const *, struct stat *);
 567
 568 int chdir_arg (char const *);
 569 void chdir_do (int);
 570
 571 void close_diag (char const *name);
 572 void open_diag (char const *name);
 573 void read_diag_details (char const *name, off_t offset, size_t size);
 574 void readlink_diag (char const *name);
 575 void savedir_diag (char const *name);
 576 void seek_diag_details (char const *, off_t);
 577 void stat_diag (char const *name);
 578 void write_error_details (char const *, size_t, size_t);
 579 void write_fatal (char const *) __attribute__ ((noreturn));
 580 void write_fatal_details (char const *, ssize_t, size_t)
 581      __attribute__ ((noreturn));
 582
 583 pid_t xfork (void);
 584 void xpipe (int[2]);
 585
 586 void *page_aligned_alloc (void **, size_t);
 587 int set_file_atime (int fd, char const *file,
 588                     struct timespec const timespec[2]);
 589
 590 /* Module names.c.  */
 591
 592 extern struct name *gnu_list_name;
 593
 594 void gid_to_gname (gid_t, char **gname);
 595 int gname_to_gid (char const *, gid_t *);
 596 void uid_to_uname (uid_t, char **uname);
 597 int uname_to_uid (char const *, uid_t *);
 598
 599 void init_names (void);
 600 void name_add_name (const char *, int);
 601 void name_add_dir (const char *name);
 602 void name_term (void);
 603 const char *name_next (int);
 604 void name_gather (void);
 605 struct name *addname (char const *, int);
 606 int name_match (const char *);
 607 void names_notfound (void);
 608 void collect_and_sort_names (void);
 609 struct name *name_scan (const char *, bool);
 610 char *name_from_list (void);
 611 void blank_name_list (void);
 612 char *new_name (const char *, const char *);
 613 size_t stripped_prefix_len (char const *file_name, size_t num);
 614 bool all_names_found (struct tar_stat_info *);
 615
 616 bool excluded_name (char const *);
 617
 618 void add_avoided_name (char const *);
 619 bool is_avoided_name (char const *);
 620 bool is_individual_file (char const *);
 621
 622 bool contains_dot_dot (char const *);
 623
 624 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 625                     (c)->found_count == occurrence_option)
 626 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 627                      (c)->found_count >= occurrence_option)
 628
 629 /* Module tar.c.  */
 630
 631 void usage (int);
 632
 633 int confirm (const char *, const char *);
 634 void request_stdin (const char *);
 635
 636 void tar_stat_init (struct tar_stat_info *st);
 637 void tar_stat_destroy (struct tar_stat_info *st);
 638 void usage (int) __attribute__ ((noreturn));
 639 int tar_timespec_cmp (struct timespec a, struct timespec b);
 640 const char *archive_format_string (enum archive_format fmt);
 641 const char *subcommand_string (enum subcommand c);
 642
 643 /* Module update.c.  */
 644
 645 extern char *output_start;
 646
 647 void update_archive (void);
 648
 649 /* Module xheader.c.  */
 650
 651 void xheader_decode (struct tar_stat_info *);
 652 void xheader_decode_global (void);
 653 void xheader_store (char const *, struct tar_stat_info const *, void const *);
 654 void xheader_read (union block *, size_t);
 655 void xheader_write (char type, char *name, struct xheader *xhdr);
 656 void xheader_write_global (void);
 657 void xheader_finish (struct xheader *);
 658 void xheader_destroy (struct xheader *);
 659 char *xheader_xhdr_name (struct tar_stat_info *st);
 660 char *xheader_ghdr_name (void);
 661 void xheader_write (char, char *, struct xheader *);
 662 void xheader_write_global (void);
 663 void xheader_set_option (char *string);
 664 void xheader_string_begin (void);
 665 void xheader_string_add (char const *s);
 666 void xheader_string_end (char const *keyword);
 667 bool xheader_keyword_deleted_p (const char *kw);
 668 char *xheader_format_name (struct tar_stat_info *st, const char *fmt,
 669                            size_t n);
 670
 671 /* Module system.c */
 672
 673 void sys_detect_dev_null_output (void);
 674 void sys_save_archive_dev_ino (void);
 675 void sys_drain_input_pipe (void);
 676 void sys_wait_for_child (pid_t);
 677 void sys_spawn_shell (void);
 678 bool sys_compare_uid (struct stat *a, struct stat *b);
 679 bool sys_compare_gid (struct stat *a, struct stat *b);
 680 bool sys_file_is_archive (struct tar_stat_info *p);
 681 bool sys_compare_links (struct stat *link_data, struct stat *stat_data);
 682 int sys_truncate (int fd);
 683 pid_t sys_child_open_for_compress (void);
 684 pid_t sys_child_open_for_uncompress (void);
 685 size_t sys_write_archive_buffer (void);
 686 bool sys_get_archive_stat (void);
 687 int sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st);
 688 void sys_wait_command (void);
 689 int sys_exec_info_script (const char **archive_name, int volume_number);
 690
 691 /* Module compare.c */
 692 void report_difference (struct tar_stat_info *st, const char *message, ...);
 693
 694 /* Module sparse.c */
 695 bool sparse_file_p (struct tar_stat_info *);
 696 bool sparse_member_p (struct tar_stat_info *);
 697 bool sparse_fixup_header (struct tar_stat_info *);
 698 enum dump_status sparse_dump_file (int, struct tar_stat_info *);
 699 enum dump_status sparse_extract_file (int, struct tar_stat_info *, off_t *);
 700 enum dump_status sparse_skip_file (struct tar_stat_info *);
 701 bool sparse_diff_file (int, struct tar_stat_info *);
 702
 703 /* Module utf8.c */
 704 bool string_ascii_p (const char *str);
 705 bool utf8_convert (bool to_utf, char const *input, char **output);
 706
 707 /* Module transform.c */
 708 void set_transform_expr (const char *expr);
 709 bool transform_name (char **pinput);
 710 bool transform_name_fp (char **pinput, char *(*fun)(char *));
 711
 712