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 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 int archive_names;
 293 GLOBAL int 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;
 303     size_t length;              /* cached strlen(name) */
 304     uintmax_t found_count;      /* number of times a matching file has
 305                                    been found */
 306     int isdir;
 307     char firstch;               /* first char is literally matched */
 308     char regexp;                /* this name is a regexp, not literal */
 309     int change_dir;             /* set with the -C option */
 310     char const *dir_contents;   /* for incremental_option */
 311     char fake;                  /* dummy entry */
 312     char name[1];
 313   };
 314
 315 /* Obnoxious test to see if dimwit is trying to dump the archive.  */
 316 GLOBAL dev_t ar_dev;
 317 GLOBAL ino_t ar_ino;
 318
 319 GLOBAL bool seekable_archive;
 320
 321 GLOBAL dev_t root_device;
 322
 323 /* Unquote filenames */
 324 GLOBAL bool unquote_option;
 325
 326 GLOBAL bool test_label_option; /* Test archive volume label and exit */
 327
 328 GLOBAL bool show_stored_names_option; /* When creating archive in verbose mode,
 329                                          list member names as stored in the
 330                                          archive */
 331
 332 \f
 333 /* Declarations for each module.  */
 334
 335 /* FIXME: compare.c should not directly handle the following variable,
 336    instead, this should be done in buffer.c only.  */
 337
 338 enum access_mode
 339 {
 340   ACCESS_READ,
 341   ACCESS_WRITE,
 342   ACCESS_UPDATE
 343 };
 344 extern enum access_mode access_mode;
 345
 346 /* Module buffer.c.  */
 347
 348 extern FILE *stdlis;
 349 extern bool write_archive_to_stdout;
 350 extern char *volume_label;
 351 extern char *continued_file_name;
 352 extern uintmax_t continued_file_size;
 353 extern uintmax_t continued_file_offset;
 354
 355 size_t available_space_after (union block *);
 356 off_t current_block_ordinal (void);
 357 void close_archive (void);
 358 void closeout_volume_number (void);
 359 union block *find_next_block (void);
 360 void flush_read (void);
 361 void flush_write (void);
 362 void flush_archive (void);
 363 void init_volume_number (void);
 364 void open_archive (enum access_mode);
 365 void print_total_written (void);
 366 void reset_eof (void);
 367 void set_next_block_after (union block *);
 368 void clear_read_error_count (void);
 369 void xclose (int fd);
 370 void archive_write_error (ssize_t) __attribute__ ((noreturn));
 371 void archive_read_error (void);
 372 off_t seek_archive (off_t size);
 373 void set_start_time (void);
 374
 375 void mv_begin (struct tar_stat_info *st);
 376 void mv_end (void);
 377 void mv_total_size (off_t size);
 378 void mv_size_left (off_t size);
 379
 380
 381 /* Module create.c.  */
 382
 383 enum dump_status
 384   {
 385     dump_status_ok,
 386     dump_status_short,
 387     dump_status_fail,
 388     dump_status_not_implemented
 389   };
 390
 391 bool file_dumpable_p (struct tar_stat_info *);
 392 void create_archive (void);
 393 void pad_archive (off_t size_left);
 394 void dump_file (char *, int, dev_t);
 395 union block *start_header (struct tar_stat_info *st);
 396 void finish_header (struct tar_stat_info *, union block *, off_t);
 397 void simple_finish_header (union block *header);
 398 union block * write_extended (bool global, struct tar_stat_info *st,
 399                               union block *old_header);
 400 union block *start_private_header (const char *name, size_t size);
 401 void write_eot (void);
 402 void check_links (void);
 403
 404 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
 405 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
 406 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
 407 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
 408 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
 409 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
 410 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
 411 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
 412 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
 413 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 414 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 415
 416 bool gid_to_chars (gid_t, char *, size_t);
 417 bool major_to_chars (major_t, char *, size_t);
 418 bool minor_to_chars (minor_t, char *, size_t);
 419 bool mode_to_chars (mode_t, char *, size_t);
 420 bool off_to_chars (off_t, char *, size_t);
 421 bool size_to_chars (size_t, char *, size_t);
 422 bool time_to_chars (time_t, char *, size_t);
 423 bool uid_to_chars (uid_t, char *, size_t);
 424 bool uintmax_to_chars (uintmax_t, char *, size_t);
 425 void string_to_chars (char const *, char *, size_t);
 426
 427 /* Module diffarch.c.  */
 428
 429 extern bool now_verifying;
 430
 431 void diff_archive (void);
 432 void diff_init (void);
 433 void verify_volume (void);
 434
 435 /* Module extract.c.  */
 436
 437 void extr_init (void);
 438 void extract_archive (void);
 439 void extract_finish (void);
 440
 441 /* Module delete.c.  */
 442
 443 void delete_archive_members (void);
 444
 445 /* Module incremen.c.  */
 446
 447 char *get_directory_contents (char *, dev_t);
 448 void read_directory_file (void);
 449 void write_directory_file (void);
 450 void purge_directory (char const *);
 451 void list_dumpdir (char *buffer, size_t size);
 452 void update_parent_directory (const char *name);
 453
 454 size_t dumpdir_size (const char *p);
 455 void get_gnu_dumpdir (void);
 456
 457 /* Module list.c.  */
 458
 459 enum read_header
 460 {
 461   HEADER_STILL_UNREAD,          /* for when read_header has not been called */
 462   HEADER_SUCCESS,               /* header successfully read and checksummed */
 463   HEADER_SUCCESS_EXTENDED,      /* likewise, but we got an extended header */
 464   HEADER_ZERO_BLOCK,            /* zero block where header expected */
 465   HEADER_END_OF_FILE,           /* true end of file while header expected */
 466   HEADER_FAILURE                /* ill-formed header, or bad checksum */
 467 };
 468
 469 struct xheader
 470 {
 471   struct obstack *stk;
 472   size_t size;
 473   char *buffer;
 474 };
 475
 476 GLOBAL struct xheader extended_header;
 477 extern union block *current_header;
 478 extern enum archive_format current_format;
 479 extern size_t recent_long_name_blocks;
 480 extern size_t recent_long_link_blocks;
 481
 482 void decode_header (union block *, struct tar_stat_info *,
 483                     enum archive_format *, int);
 484 char const *tartime (struct timespec, bool);
 485
 486 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
 487 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
 488 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
 489 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
 490 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
 491 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
 492 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
 493 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
 494 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
 495
 496 gid_t gid_from_header (const char *, size_t);
 497 major_t major_from_header (const char *, size_t);
 498 minor_t minor_from_header (const char *, size_t);
 499 mode_t mode_from_header (const char *, size_t);
 500 off_t off_from_header (const char *, size_t);
 501 size_t size_from_header (const char *, size_t);
 502 time_t time_from_header (const char *, size_t);
 503 uid_t uid_from_header (const char *, size_t);
 504 uintmax_t uintmax_from_header (const char *, size_t);
 505
 506 void list_archive (void);
 507 void print_for_mkdir (char *, int, mode_t);
 508 void print_header (struct tar_stat_info *, off_t);
 509 void read_and (void (*) (void));
 510 enum read_header read_header (bool);
 511 enum read_header tar_checksum (union block *header, bool silent);
 512 void skip_file (off_t);
 513 void skip_member (void);
 514
 515 /* Module mangle.c.  */
 516
 517 void extract_mangle (void);
 518
 519 /* Module misc.c.  */
 520
 521 void assign_string (char **, const char *);
 522 char *quote_copy_string (const char *);
 523 int unquote_string (char *);
 524
 525 void code_ns_fraction (int, char *);
 526 char const *code_timespec (struct timespec, char *);
 527 enum { BILLION = 1000000000, LOG10_BILLION = 9 };
 528 enum { TIMESPEC_STRSIZE_BOUND =
 529          UINTMAX_STRSIZE_BOUND + LOG10_BILLION + sizeof "-." - 1 };
 530
 531 size_t dot_dot_prefix_len (char const *);
 532
 533 enum remove_option
 534 {
 535   ORDINARY_REMOVE_OPTION,
 536   RECURSIVE_REMOVE_OPTION,
 537
 538   /* FIXME: The following value is never used. It seems to be intended
 539      as a placeholder for a hypothetical option that should instruct tar
 540      to recursively remove subdirectories in purge_directory(),
 541      as opposed to the functionality of --recursive-unlink
 542      (RECURSIVE_REMOVE_OPTION value), which removes them in
 543      prepare_to_extract() phase. However, with the addition of more
 544      meta-info to the incremental dumps, this should become unnecessary */
 545   WANT_DIRECTORY_REMOVE_OPTION
 546 };
 547 int remove_any_file (const char *, enum remove_option);
 548 bool maybe_backup_file (const char *, int);
 549 void undo_last_backup (void);
 550
 551 int deref_stat (bool, char const *, struct stat *);
 552
 553 int chdir_arg (char const *);
 554 void chdir_do (int);
 555
 556 void close_diag (char const *name);
 557 void open_diag (char const *name);
 558 void read_diag_details (char const *name, off_t offset, size_t size);
 559 void readlink_diag (char const *name);
 560 void savedir_diag (char const *name);
 561 void seek_diag_details (char const *, off_t);
 562 void stat_diag (char const *name);
 563 void write_error_details (char const *, size_t, size_t);
 564 void write_fatal (char const *) __attribute__ ((noreturn));
 565 void write_fatal_details (char const *, ssize_t, size_t)
 566      __attribute__ ((noreturn));
 567
 568 pid_t xfork (void);
 569 void xpipe (int[2]);
 570
 571 void *page_aligned_alloc (void **, size_t);
 572
 573 /* Module names.c.  */
 574
 575 extern struct name *gnu_list_name;
 576
 577 void gid_to_gname (gid_t, char **gname);
 578 int gname_to_gid (char const *, gid_t *);
 579 void uid_to_uname (uid_t, char **uname);
 580 int uname_to_uid (char const *, uid_t *);
 581
 582 void init_names (void);
 583 void name_add (const char *);
 584 void name_init (void);
 585 void name_term (void);
 586 char *name_next (int);
 587 void name_gather (void);
 588 struct name *addname (char const *, int);
 589 int name_match (const char *);
 590 void names_notfound (void);
 591 void collect_and_sort_names (void);
 592 struct name *name_scan (const char *);
 593 char *name_from_list (void);
 594 void blank_name_list (void);
 595 char *new_name (const char *, const char *);
 596 size_t stripped_prefix_len (char const *file_name, size_t num);
 597 bool all_names_found (struct tar_stat_info *);
 598
 599 bool excluded_name (char const *);
 600
 601 void add_avoided_name (char const *);
 602 bool is_avoided_name (char const *);
 603 bool is_individual_file (char const *);
 604
 605 bool contains_dot_dot (char const *);
 606
 607 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 608                     (c)->found_count == occurrence_option)
 609 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 610                      (c)->found_count >= occurrence_option)
 611
 612 /* Module tar.c.  */
 613
 614 void usage (int);
 615
 616 int confirm (const char *, const char *);
 617 void request_stdin (const char *);
 618
 619 void tar_stat_init (struct tar_stat_info *st);
 620 void tar_stat_destroy (struct tar_stat_info *st);
 621 void usage (int) __attribute__ ((noreturn));
 622 int tar_timespec_cmp (struct timespec a, struct timespec b);
 623 const char *archive_format_string (enum archive_format fmt);
 624 const char *subcommand_string (enum subcommand c);
 625
 626 /* Module update.c.  */
 627
 628 extern char *output_start;
 629
 630 void update_archive (void);
 631
 632 /* Module xheader.c.  */
 633
 634 void xheader_decode (struct tar_stat_info *);
 635 void xheader_decode_global (void);
 636 void xheader_store (char const *, struct tar_stat_info const *, void const *);
 637 void xheader_read (union block *, size_t);
 638 void xheader_write (char type, char *name, struct xheader *xhdr);
 639 void xheader_write_global (void);
 640 void xheader_finish (struct xheader *);
 641 void xheader_destroy (struct xheader *);
 642 char *xheader_xhdr_name (struct tar_stat_info *st);
 643 char *xheader_ghdr_name (void);
 644 void xheader_write (char, char *, struct xheader *);
 645 void xheader_write_global (void);
 646 void xheader_set_option (char *string);
 647 void xheader_string_begin (void);
 648 void xheader_string_add (char const *s);
 649 void xheader_string_end (char const *keyword);
 650 bool xheader_keyword_deleted_p (const char *kw);
 651 char *xheader_format_name (struct tar_stat_info *st, const char *fmt,
 652                            size_t n);
 653
 654 /* Module system.c */
 655
 656 void sys_detect_dev_null_output (void);
 657 void sys_save_archive_dev_ino (void);
 658 void sys_drain_input_pipe (void);
 659 void sys_wait_for_child (pid_t);
 660 void sys_spawn_shell (void);
 661 bool sys_compare_uid (struct stat *a, struct stat *b);
 662 bool sys_compare_gid (struct stat *a, struct stat *b);
 663 bool sys_file_is_archive (struct tar_stat_info *p);
 664 bool sys_compare_links (struct stat *link_data, struct stat *stat_data);
 665 int sys_truncate (int fd);
 666 pid_t sys_child_open_for_compress (void);
 667 pid_t sys_child_open_for_uncompress (void);
 668 size_t sys_write_archive_buffer (void);
 669 bool sys_get_archive_stat (void);
 670 int sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st);
 671 void sys_wait_command (void);
 672 int sys_exec_info_script (const char **archive_name, int volume_number);
 673
 674 /* Module compare.c */
 675 void report_difference (struct tar_stat_info *st, const char *message, ...);
 676
 677 /* Module sparse.c */
 678 bool sparse_file_p (struct tar_stat_info *);
 679 bool sparse_member_p (struct tar_stat_info *);
 680 bool sparse_fixup_header (struct tar_stat_info *);
 681 enum dump_status sparse_dump_file (int, struct tar_stat_info *);
 682 enum dump_status sparse_extract_file (int, struct tar_stat_info *, off_t *);
 683 enum dump_status sparse_skip_file (struct tar_stat_info *);
 684 bool sparse_diff_file (int, struct tar_stat_info *);
 685
 686 /* Module utf8.c */
 687 bool string_ascii_p (const char *str);
 688 bool utf8_convert (bool to_utf, char const *input, char **output);