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 /* Return true if the extracted files are not being written to disk */
 258 #define EXTRACT_OVER_PIPE (to_stdout_option || to_command_option)
 259
 260 /* Count how many times the option has been set, multiple setting yields
 261    more verbose behavior.  Value 0 means no verbosity, 1 means file name
 262    only, 2 means file name and all attributes.  More than 2 is just like 2.  */
 263 GLOBAL int verbose_option;
 264
 265 GLOBAL bool verify_option;
 266
 267 /* Specified name of file containing the volume number.  */
 268 GLOBAL const char *volno_file_option;
 269
 270 /* Specified value or pattern.  */
 271 GLOBAL const char *volume_label_option;
 272 \f
 273 /* Other global variables.  */
 274
 275 /* File descriptor for archive file.  */
 276 GLOBAL int archive;
 277
 278 /* Nonzero when outputting to /dev/null.  */
 279 GLOBAL bool dev_null_output;
 280
 281 /* Timestamp for when we started execution.  */
 282 GLOBAL struct timespec start_time;
 283
 284 GLOBAL struct tar_stat_info current_stat_info;
 285
 286 /* List of tape drive names, number of such tape drives, allocated number,
 287    and current cursor in list.  */
 288 GLOBAL const char **archive_name_array;
 289 GLOBAL int archive_names;
 290 GLOBAL int allocated_archive_names;
 291 GLOBAL const char **archive_name_cursor;
 292
 293 /* Output index file name.  */
 294 GLOBAL char const *index_file_name;
 295
 296 /* Structure for keeping track of filenames and lists thereof.  */
 297 struct name
 298   {
 299     struct name *next;
 300     size_t length;              /* cached strlen(name) */
 301     uintmax_t found_count;      /* number of times a matching file has
 302                                    been found */
 303     int isdir;
 304     char firstch;               /* first char is literally matched */
 305     char regexp;                /* this name is a regexp, not literal */
 306     int change_dir;             /* set with the -C option */
 307     char const *dir_contents;   /* for incremental_option */
 308     char fake;                  /* dummy entry */
 309     char name[1];
 310   };
 311
 312 /* Obnoxious test to see if dimwit is trying to dump the archive.  */
 313 GLOBAL dev_t ar_dev;
 314 GLOBAL ino_t ar_ino;
 315
 316 GLOBAL bool seekable_archive;
 317
 318 GLOBAL dev_t root_device;
 319
 320 /* Unquote filenames */
 321 GLOBAL bool unquote_option;
 322
 323 GLOBAL bool test_label_option; /* Test archive volume label and exit */
 324
 325 GLOBAL bool show_stored_names_option; /* When creating archive in verbose mode,
 326                                          list member names as stored in the
 327                                          archive */
 328
 329 \f
 330 /* Declarations for each module.  */
 331
 332 /* FIXME: compare.c should not directly handle the following variable,
 333    instead, this should be done in buffer.c only.  */
 334
 335 enum access_mode
 336 {
 337   ACCESS_READ,
 338   ACCESS_WRITE,
 339   ACCESS_UPDATE
 340 };
 341 extern enum access_mode access_mode;
 342
 343 /* Module buffer.c.  */
 344
 345 extern FILE *stdlis;
 346 extern bool write_archive_to_stdout;
 347 extern char *volume_label;
 348 extern char *continued_file_name;
 349 extern uintmax_t continued_file_size;
 350 extern uintmax_t continued_file_offset;
 351
 352 size_t available_space_after (union block *);
 353 off_t current_block_ordinal (void);
 354 void close_archive (void);
 355 void closeout_volume_number (void);
 356 union block *find_next_block (void);
 357 void flush_read (void);
 358 void flush_write (void);
 359 void flush_archive (void);
 360 void init_volume_number (void);
 361 void open_archive (enum access_mode);
 362 void print_total_written (void);
 363 void reset_eof (void);
 364 void set_next_block_after (union block *);
 365 void clear_read_error_count (void);
 366 void xclose (int fd);
 367 void archive_write_error (ssize_t) __attribute__ ((noreturn));
 368 void archive_read_error (void);
 369 off_t seek_archive (off_t size);
 370 void set_start_time (void);
 371
 372 void mv_begin (struct tar_stat_info *st);
 373 void mv_end (void);
 374 void mv_total_size (off_t size);
 375 void mv_size_left (off_t size);
 376
 377
 378 /* Module create.c.  */
 379
 380 enum dump_status
 381   {
 382     dump_status_ok,
 383     dump_status_short,
 384     dump_status_fail,
 385     dump_status_not_implemented
 386   };
 387
 388 bool file_dumpable_p (struct tar_stat_info *);
 389 void create_archive (void);
 390 void pad_archive (off_t size_left);
 391 void dump_file (char *, int, dev_t);
 392 union block *start_header (struct tar_stat_info *st);
 393 void finish_header (struct tar_stat_info *, union block *, off_t);
 394 void simple_finish_header (union block *header);
 395 union block * write_extended (bool global, struct tar_stat_info *st,
 396                               union block *old_header);
 397 union block *start_private_header (const char *name, size_t size);
 398 void write_eot (void);
 399 void check_links (void);
 400
 401 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
 402 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
 403 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
 404 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
 405 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
 406 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
 407 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
 408 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
 409 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
 410 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 411 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 412
 413 void gid_to_chars (gid_t, char *, size_t);
 414 void major_to_chars (major_t, char *, size_t);
 415 void minor_to_chars (minor_t, char *, size_t);
 416 void mode_to_chars (mode_t, char *, size_t);
 417 void off_to_chars (off_t, char *, size_t);
 418 void size_to_chars (size_t, char *, size_t);
 419 void time_to_chars (time_t, char *, size_t);
 420 void uid_to_chars (uid_t, char *, size_t);
 421 void uintmax_to_chars (uintmax_t, char *, size_t);
 422 void string_to_chars (char const *, char *, size_t);
 423
 424 /* Module diffarch.c.  */
 425
 426 extern bool now_verifying;
 427
 428 void diff_archive (void);
 429 void diff_init (void);
 430 void verify_volume (void);
 431
 432 /* Module extract.c.  */
 433
 434 void extr_init (void);
 435 void extract_archive (void);
 436 void extract_finish (void);
 437
 438 /* Module delete.c.  */
 439
 440 void delete_archive_members (void);
 441
 442 /* Module incremen.c.  */
 443
 444 char *get_directory_contents (char *, dev_t);
 445 void read_directory_file (void);
 446 void write_directory_file (void);
 447 void purge_directory (char const *);
 448 void list_dumpdir (char *buffer, size_t size);
 449 void update_parent_directory (const char *name);
 450
 451 size_t dumpdir_size (const char *p);
 452 void get_gnu_dumpdir (void);
 453
 454 /* Module list.c.  */
 455
 456 enum read_header
 457 {
 458   HEADER_STILL_UNREAD,          /* for when read_header has not been called */
 459   HEADER_SUCCESS,               /* header successfully read and checksummed */
 460   HEADER_SUCCESS_EXTENDED,      /* likewise, but we got an extended header */
 461   HEADER_ZERO_BLOCK,            /* zero block where header expected */
 462   HEADER_END_OF_FILE,           /* true end of file while header expected */
 463   HEADER_FAILURE                /* ill-formed header, or bad checksum */
 464 };
 465
 466 struct xheader
 467 {
 468   struct obstack *stk;
 469   size_t size;
 470   char *buffer;
 471 };
 472
 473 GLOBAL struct xheader extended_header;
 474 extern union block *current_header;
 475 extern enum archive_format current_format;
 476 extern size_t recent_long_name_blocks;
 477 extern size_t recent_long_link_blocks;
 478
 479 void decode_header (union block *, struct tar_stat_info *,
 480                     enum archive_format *, int);
 481 char const *tartime (struct timespec, bool);
 482
 483 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
 484 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
 485 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
 486 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
 487 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
 488 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
 489 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
 490 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
 491 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
 492
 493 gid_t gid_from_header (const char *, size_t);
 494 major_t major_from_header (const char *, size_t);
 495 minor_t minor_from_header (const char *, size_t);
 496 mode_t mode_from_header (const char *, size_t);
 497 off_t off_from_header (const char *, size_t);
 498 size_t size_from_header (const char *, size_t);
 499 time_t time_from_header (const char *, size_t);
 500 uid_t uid_from_header (const char *, size_t);
 501 uintmax_t uintmax_from_header (const char *, size_t);
 502
 503 void list_archive (void);
 504 void print_for_mkdir (char *, int, mode_t);
 505 void print_header (struct tar_stat_info *, off_t);
 506 void read_and (void (*) (void));
 507 enum read_header read_header (bool);
 508 enum read_header tar_checksum (union block *header, bool silent);
 509 void skip_file (off_t);
 510 void skip_member (void);
 511
 512 /* Module mangle.c.  */
 513
 514 void extract_mangle (void);
 515
 516 /* Module misc.c.  */
 517
 518 void assign_string (char **, const char *);
 519 char *quote_copy_string (const char *);
 520 int unquote_string (char *);
 521
 522 void code_ns_fraction (int, char *);
 523 char const *code_timespec (struct timespec, char *);
 524 enum { BILLION = 1000000000, LOG10_BILLION = 9 };
 525 enum { TIMESPEC_STRSIZE_BOUND =
 526          UINTMAX_STRSIZE_BOUND + LOG10_BILLION + sizeof "-." - 1 };
 527
 528 size_t dot_dot_prefix_len (char const *);
 529
 530 enum remove_option
 531 {
 532   ORDINARY_REMOVE_OPTION,
 533   RECURSIVE_REMOVE_OPTION,
 534
 535   /* FIXME: The following value is never used. It seems to be intended
 536      as a placeholder for a hypothetical option that should instruct tar
 537      to recursively remove subdirectories in purge_directory(),
 538      as opposed to the functionality of --recursive-unlink
 539      (RECURSIVE_REMOVE_OPTION value), which removes them in
 540      prepare_to_extract() phase. However, with the addition of more
 541      meta-info to the incremental dumps, this should become unnecessary */
 542   WANT_DIRECTORY_REMOVE_OPTION
 543 };
 544 int remove_any_file (const char *, enum remove_option);
 545 bool maybe_backup_file (const char *, int);
 546 void undo_last_backup (void);
 547
 548 int deref_stat (bool, char const *, struct stat *);
 549
 550 int chdir_arg (char const *);
 551 void chdir_do (int);
 552
 553 void close_diag (char const *name);
 554 void open_diag (char const *name);
 555 void read_diag_details (char const *name, off_t offset, size_t size);
 556 void readlink_diag (char const *name);
 557 void savedir_diag (char const *name);
 558 void seek_diag_details (char const *, off_t);
 559 void stat_diag (char const *name);
 560 void write_error_details (char const *, size_t, size_t);
 561 void write_fatal (char const *) __attribute__ ((noreturn));
 562 void write_fatal_details (char const *, ssize_t, size_t)
 563      __attribute__ ((noreturn));
 564
 565 pid_t xfork (void);
 566 void xpipe (int[2]);
 567
 568 void *page_aligned_alloc (void **, size_t);
 569
 570 /* Module names.c.  */
 571
 572 extern struct name *gnu_list_name;
 573
 574 void gid_to_gname (gid_t, char **gname);
 575 int gname_to_gid (char const *, gid_t *);
 576 void uid_to_uname (uid_t, char **uname);
 577 int uname_to_uid (char const *, uid_t *);
 578
 579 void init_names (void);
 580 void name_add (const char *);
 581 void name_init (void);
 582 void name_term (void);
 583 char *name_next (int);
 584 void name_gather (void);
 585 struct name *addname (char const *, int);
 586 int name_match (const char *);
 587 void names_notfound (void);
 588 void collect_and_sort_names (void);
 589 struct name *name_scan (const char *);
 590 char *name_from_list (void);
 591 void blank_name_list (void);
 592 char *new_name (const char *, const char *);
 593 size_t stripped_prefix_len (char const *file_name, size_t num);
 594 bool all_names_found (struct tar_stat_info *);
 595
 596 bool excluded_name (char const *);
 597
 598 void add_avoided_name (char const *);
 599 bool is_avoided_name (char const *);
 600 bool is_individual_file (char const *);
 601
 602 bool contains_dot_dot (char const *);
 603
 604 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 605                     (c)->found_count == occurrence_option)
 606 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 607                      (c)->found_count >= occurrence_option)
 608
 609 /* Module tar.c.  */
 610
 611 void usage (int);
 612
 613 int confirm (const char *, const char *);
 614 void request_stdin (const char *);
 615
 616 void tar_stat_init (struct tar_stat_info *st);
 617 void tar_stat_destroy (struct tar_stat_info *st);
 618 void usage (int) __attribute__ ((noreturn));
 619 int tar_timespec_cmp (struct timespec a, struct timespec b);
 620
 621 /* Module update.c.  */
 622
 623 extern char *output_start;
 624
 625 void update_archive (void);
 626
 627 /* Module xheader.c.  */
 628
 629 void xheader_decode (struct tar_stat_info *);
 630 void xheader_decode_global (void);
 631 void xheader_store (char const *, struct tar_stat_info const *, void const *);
 632 void xheader_read (union block *, size_t);
 633 void xheader_write (char type, char *name, struct xheader *xhdr);
 634 void xheader_write_global (void);
 635 void xheader_finish (struct xheader *);
 636 void xheader_destroy (struct xheader *);
 637 char *xheader_xhdr_name (struct tar_stat_info *st);
 638 char *xheader_ghdr_name (void);
 639 void xheader_write (char, char *, struct xheader *);
 640 void xheader_write_global (void);
 641 void xheader_set_option (char *string);
 642 void xheader_string_begin (void);
 643 void xheader_string_add (char const *s);
 644 void xheader_string_end (char const *keyword);
 645 bool xheader_keyword_deleted_p (const char *kw);
 646 char *xheader_format_name (struct tar_stat_info *st, const char *fmt,
 647                            size_t n);
 648
 649 /* Module system.c */
 650
 651 void sys_detect_dev_null_output (void);
 652 void sys_save_archive_dev_ino (void);
 653 void sys_drain_input_pipe (void);
 654 void sys_wait_for_child (pid_t);
 655 void sys_spawn_shell (void);
 656 bool sys_compare_uid (struct stat *a, struct stat *b);
 657 bool sys_compare_gid (struct stat *a, struct stat *b);
 658 bool sys_file_is_archive (struct tar_stat_info *p);
 659 bool sys_compare_links (struct stat *link_data, struct stat *stat_data);
 660 int sys_truncate (int fd);
 661 pid_t sys_child_open_for_compress (void);
 662 pid_t sys_child_open_for_uncompress (void);
 663 size_t sys_write_archive_buffer (void);
 664 bool sys_get_archive_stat (void);
 665 int sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st);
 666 void sys_wait_command (void);
 667
 668 /* Module compare.c */
 669 void report_difference (struct tar_stat_info *st, const char *message, ...);
 670
 671 /* Module sparse.c */
 672 bool sparse_file_p (struct tar_stat_info *);
 673 bool sparse_member_p (struct tar_stat_info *);
 674 bool sparse_fixup_header (struct tar_stat_info *);
 675 enum dump_status sparse_dump_file (int, struct tar_stat_info *);
 676 enum dump_status sparse_extract_file (int, struct tar_stat_info *, off_t *);
 677 enum dump_status sparse_skip_file (struct tar_stat_info *);
 678 bool sparse_diff_file (int, struct tar_stat_info *);
 679
 680 /* Module utf8.c */
 681 bool string_ascii_p (const char *str);
 682 bool utf8_convert (bool to_utf, char const *input, char **output);