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 GLOBAL bool atime_preserve_option;
 118
 119 GLOBAL bool backup_option;
 120
 121 /* Type of backups being made.  */
 122 GLOBAL enum backup_type backup_type;
 123
 124 GLOBAL bool block_number_option;
 125
 126 GLOBAL bool checkpoint_option;
 127
 128 /* Specified name of compression program, or "gzip" as implied by -z.  */
 129 GLOBAL const char *use_compress_program_option;
 130
 131 GLOBAL bool dereference_option;
 132
 133 /* Print a message if not all links are dumped */
 134 GLOBAL int check_links_option;
 135
 136 /* Patterns that match file names to be excluded.  */
 137 GLOBAL struct exclude *excluded;
 138
 139 /* Exclude directories containing a cache directory tag. */
 140 GLOBAL bool exclude_caches_option;
 141
 142 /* Specified value to be put into tar file in place of stat () results, or
 143    just -1 if such an override should not take place.  */
 144 GLOBAL gid_t group_option;
 145
 146 GLOBAL bool ignore_failed_read_option;
 147
 148 GLOBAL bool ignore_zeros_option;
 149
 150 GLOBAL bool incremental_option;
 151
 152 /* Specified name of script to run at end of each tape change.  */
 153 GLOBAL const char *info_script_option;
 154
 155 GLOBAL bool interactive_option;
 156
 157 /* If nonzero, extract only Nth occurrence of each named file */
 158 GLOBAL uintmax_t occurrence_option;
 159
 160 enum old_files
 161 {
 162   DEFAULT_OLD_FILES,          /* default */
 163   NO_OVERWRITE_DIR_OLD_FILES, /* --no-overwrite-dir */
 164   OVERWRITE_OLD_FILES,        /* --overwrite */
 165   UNLINK_FIRST_OLD_FILES,     /* --unlink-first */
 166   KEEP_OLD_FILES,             /* --keep-old-files */
 167   KEEP_NEWER_FILES            /* --keep-newer-files */
 168 };
 169 GLOBAL enum old_files old_files_option;
 170
 171 /* Specified file name for incremental list.  */
 172 GLOBAL const char *listed_incremental_option;
 173
 174 /* Specified mode change string.  */
 175 GLOBAL struct mode_change *mode_option;
 176
 177 /* Initial umask, if needed for mode change string.  */
 178 GLOBAL mode_t initial_umask;
 179
 180 GLOBAL bool multi_volume_option;
 181
 182 /* Specified threshold date and time.  Files having an older time stamp
 183    do not get archived (also see after_date_option above).  */
 184 GLOBAL struct timespec newer_mtime_option;
 185
 186 /* Return true if newer_mtime_option is initialized.  */
 187 #define NEWER_OPTION_INITIALIZED(opt) (0 <= (opt).tv_nsec)
 188
 189 /* Return true if the struct stat ST's M time is less than
 190    newer_mtime_option.  */
 191 #define OLDER_STAT_TIME(st, m) \
 192   (timespec_cmp (get_stat_##m##time (&(st)), newer_mtime_option) < 0)
 193
 194 /* Likewise, for struct tar_stat_info ST.  */
 195 #define OLDER_TAR_STAT_TIME(st, m) \
 196   (timespec_cmp ((st).m##time, newer_mtime_option) < 0)
 197
 198 /* Zero if there is no recursion, otherwise FNM_LEADING_DIR.  */
 199 GLOBAL int recursion_option;
 200
 201 GLOBAL bool numeric_owner_option;
 202
 203 GLOBAL bool one_file_system_option;
 204
 205 /* Specified value to be put into tar file in place of stat () results, or
 206    just -1 if such an override should not take place.  */
 207 GLOBAL uid_t owner_option;
 208
 209 GLOBAL bool recursive_unlink_option;
 210
 211 GLOBAL bool read_full_records_option;
 212
 213 GLOBAL bool remove_files_option;
 214
 215 /* Specified rmt command.  */
 216 GLOBAL const char *rmt_command_option;
 217
 218 /* Specified remote shell command.  */
 219 GLOBAL const char *rsh_command_option;
 220
 221 GLOBAL bool same_order_option;
 222
 223 /* If positive, preserve ownership when extracting.  */
 224 GLOBAL int same_owner_option;
 225
 226 /* If positive, preserve permissions when extracting.  */
 227 GLOBAL int same_permissions_option;
 228
 229 /* When set, strip the given number of file name components from the file name
 230    before extracting */
 231 GLOBAL size_t strip_name_components;
 232
 233 GLOBAL bool show_omitted_dirs_option;
 234
 235 GLOBAL bool sparse_option;
 236
 237 GLOBAL bool starting_file_option;
 238
 239 /* Specified maximum byte length of each tape volume (multiple of 1024).  */
 240 GLOBAL tarlong tape_length_option;
 241
 242 GLOBAL bool to_stdout_option;
 243
 244 GLOBAL bool totals_option;
 245
 246 GLOBAL bool touch_option;
 247
 248 GLOBAL char *to_command_option;
 249 GLOBAL bool ignore_command_error_option;
 250
 251 /* Return true if the extracted files are not being written to disk */
 252 #define EXTRACT_OVER_PIPE (to_stdout_option || to_command_option)
 253
 254 /* Count how many times the option has been set, multiple setting yields
 255    more verbose behavior.  Value 0 means no verbosity, 1 means file name
 256    only, 2 means file name and all attributes.  More than 2 is just like 2.  */
 257 GLOBAL int verbose_option;
 258
 259 GLOBAL bool verify_option;
 260
 261 /* Specified name of file containing the volume number.  */
 262 GLOBAL const char *volno_file_option;
 263
 264 /* Specified value or pattern.  */
 265 GLOBAL const char *volume_label_option;
 266 \f
 267 /* Other global variables.  */
 268
 269 /* File descriptor for archive file.  */
 270 GLOBAL int archive;
 271
 272 /* Nonzero when outputting to /dev/null.  */
 273 GLOBAL bool dev_null_output;
 274
 275 /* Timestamp for when we started execution.  */
 276 GLOBAL struct timespec start_time;
 277
 278 GLOBAL struct tar_stat_info current_stat_info;
 279
 280 /* List of tape drive names, number of such tape drives, allocated number,
 281    and current cursor in list.  */
 282 GLOBAL const char **archive_name_array;
 283 GLOBAL int archive_names;
 284 GLOBAL int allocated_archive_names;
 285 GLOBAL const char **archive_name_cursor;
 286
 287 /* Output index file name.  */
 288 GLOBAL char const *index_file_name;
 289
 290 /* Structure for keeping track of filenames and lists thereof.  */
 291 struct name
 292   {
 293     struct name *next;
 294     size_t length;              /* cached strlen(name) */
 295     uintmax_t found_count;      /* number of times a matching file has
 296                                    been found */
 297     int isdir;
 298     char firstch;               /* first char is literally matched */
 299     char regexp;                /* this name is a regexp, not literal */
 300     int change_dir;             /* set with the -C option */
 301     char const *dir_contents;   /* for incremental_option */
 302     char fake;                  /* dummy entry */
 303     char name[1];
 304   };
 305
 306 /* Obnoxious test to see if dimwit is trying to dump the archive.  */
 307 GLOBAL dev_t ar_dev;
 308 GLOBAL ino_t ar_ino;
 309
 310 GLOBAL bool seekable_archive;
 311
 312 GLOBAL dev_t root_device;
 313
 314 /* Unquote filenames */
 315 GLOBAL bool unquote_option;
 316
 317 GLOBAL bool test_label_option;
 318
 319 \f
 320 /* Declarations for each module.  */
 321
 322 /* FIXME: compare.c should not directly handle the following variable,
 323    instead, this should be done in buffer.c only.  */
 324
 325 enum access_mode
 326 {
 327   ACCESS_READ,
 328   ACCESS_WRITE,
 329   ACCESS_UPDATE
 330 };
 331 extern enum access_mode access_mode;
 332
 333 /* Module buffer.c.  */
 334
 335 extern FILE *stdlis;
 336 extern char *save_name;
 337 extern off_t save_sizeleft;
 338 extern off_t save_totsize;
 339 extern bool write_archive_to_stdout;
 340
 341 size_t available_space_after (union block *);
 342 off_t current_block_ordinal (void);
 343 void close_archive (void);
 344 void closeout_volume_number (void);
 345 union block *find_next_block (void);
 346 void flush_read (void);
 347 void flush_write (void);
 348 void flush_archive (void);
 349 void init_volume_number (void);
 350 void open_archive (enum access_mode);
 351 void print_total_written (void);
 352 void reset_eof (void);
 353 void set_next_block_after (union block *);
 354 void clear_read_error_count (void);
 355 void xclose (int fd);
 356 void archive_write_error (ssize_t) __attribute__ ((noreturn));
 357 void archive_read_error (void);
 358 off_t seek_archive (off_t size);
 359 void set_start_time (void);
 360
 361 /* Module create.c.  */
 362
 363 enum dump_status
 364   {
 365     dump_status_ok,
 366     dump_status_short,
 367     dump_status_fail,
 368     dump_status_not_implemented
 369   };
 370
 371 bool file_dumpable_p (struct tar_stat_info *);
 372 void create_archive (void);
 373 void pad_archive (off_t size_left);
 374 void dump_file (char *, int, dev_t);
 375 union block *start_header (struct tar_stat_info *st);
 376 void finish_header (struct tar_stat_info *, union block *, off_t);
 377 void simple_finish_header (union block *header);
 378 union block *start_private_header (const char *name, size_t size);
 379 void write_eot (void);
 380 void check_links (void);
 381
 382 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
 383 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
 384 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
 385 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
 386 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
 387 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
 388 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
 389 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
 390 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
 391 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 392 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 393
 394 void gid_to_chars (gid_t, char *, size_t);
 395 void major_to_chars (major_t, char *, size_t);
 396 void minor_to_chars (minor_t, char *, size_t);
 397 void mode_to_chars (mode_t, char *, size_t);
 398 void off_to_chars (off_t, char *, size_t);
 399 void size_to_chars (size_t, char *, size_t);
 400 void time_to_chars (time_t, char *, size_t);
 401 void uid_to_chars (uid_t, char *, size_t);
 402 void uintmax_to_chars (uintmax_t, char *, size_t);
 403 void string_to_chars (char const *, char *, size_t);
 404
 405 /* Module diffarch.c.  */
 406
 407 extern bool now_verifying;
 408
 409 void diff_archive (void);
 410 void diff_init (void);
 411 void verify_volume (void);
 412
 413 /* Module extract.c.  */
 414
 415 void extr_init (void);
 416 void extract_archive (void);
 417 void extract_finish (void);
 418
 419 /* Module delete.c.  */
 420
 421 void delete_archive_members (void);
 422
 423 /* Module incremen.c.  */
 424
 425 char *get_directory_contents (char *, dev_t);
 426 void read_directory_file (void);
 427 void write_directory_file (void);
 428 void purge_directory (char const *);
 429 void list_dumpdir (char *buffer, size_t size);
 430
 431 /* Module list.c.  */
 432
 433 enum read_header
 434 {
 435   HEADER_STILL_UNREAD,          /* for when read_header has not been called */
 436   HEADER_SUCCESS,               /* header successfully read and checksummed */
 437   HEADER_SUCCESS_EXTENDED,      /* likewise, but we got an extended header */
 438   HEADER_ZERO_BLOCK,            /* zero block where header expected */
 439   HEADER_END_OF_FILE,           /* true end of file while header expected */
 440   HEADER_FAILURE                /* ill-formed header, or bad checksum */
 441 };
 442
 443 struct xheader
 444 {
 445   struct obstack *stk;
 446   size_t size;
 447   char *buffer;
 448 };
 449
 450 GLOBAL struct xheader extended_header;
 451 extern union block *current_header;
 452 extern enum archive_format current_format;
 453 extern size_t recent_long_name_blocks;
 454 extern size_t recent_long_link_blocks;
 455
 456 void decode_header (union block *, struct tar_stat_info *,
 457                     enum archive_format *, int);
 458 char const *tartime (struct timespec, bool);
 459
 460 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
 461 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
 462 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
 463 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
 464 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
 465 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
 466 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
 467 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
 468 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
 469
 470 gid_t gid_from_header (const char *, size_t);
 471 major_t major_from_header (const char *, size_t);
 472 minor_t minor_from_header (const char *, size_t);
 473 mode_t mode_from_header (const char *, size_t);
 474 off_t off_from_header (const char *, size_t);
 475 size_t size_from_header (const char *, size_t);
 476 time_t time_from_header (const char *, size_t);
 477 uid_t uid_from_header (const char *, size_t);
 478 uintmax_t uintmax_from_header (const char *, size_t);
 479
 480 void list_archive (void);
 481 void print_for_mkdir (char *, int, mode_t);
 482 void print_header (struct tar_stat_info *, off_t);
 483 void read_and (void (*) (void));
 484 enum read_header read_header (bool);
 485 enum read_header tar_checksum (union block *header, bool silent);
 486 void skip_file (off_t);
 487 void skip_member (void);
 488
 489 /* Module mangle.c.  */
 490
 491 void extract_mangle (void);
 492
 493 /* Module misc.c.  */
 494
 495 void assign_string (char **, const char *);
 496 char *quote_copy_string (const char *);
 497 int unquote_string (char *);
 498
 499 void code_ns_fraction (int, char *);
 500 char const *code_timespec (struct timespec, char *);
 501 enum { BILLION = 1000000000, LOG10_BILLION = 9 };
 502 enum { TIMESPEC_STRSIZE_BOUND =
 503          UINTMAX_STRSIZE_BOUND + LOG10_BILLION + sizeof "-." - 1 };
 504
 505 size_t dot_dot_prefix_len (char const *);
 506
 507 enum remove_option
 508 {
 509   ORDINARY_REMOVE_OPTION,
 510   RECURSIVE_REMOVE_OPTION,
 511
 512   /* FIXME: The following value is never used. It seems to be intended
 513      as a placeholder for a hypothetical option that should instruct tar
 514      to recursively remove subdirectories in purge_directory(),
 515      as opposed to the functionality of --recursive-unlink
 516      (RECURSIVE_REMOVE_OPTION value), which removes them in
 517      prepare_to_extract() phase. However, with the addition of more
 518      meta-info to the incremental dumps, this should become unnecessary */
 519   WANT_DIRECTORY_REMOVE_OPTION
 520 };
 521 int remove_any_file (const char *, enum remove_option);
 522 bool maybe_backup_file (const char *, int);
 523 void undo_last_backup (void);
 524
 525 int deref_stat (bool, char const *, struct stat *);
 526
 527 int chdir_arg (char const *);
 528 void chdir_do (int);
 529
 530 void close_diag (char const *name);
 531 void open_diag (char const *name);
 532 void read_diag_details (char const *name, off_t offset, size_t size);
 533 void readlink_diag (char const *name);
 534 void savedir_diag (char const *name);
 535 void seek_diag_details (char const *, off_t);
 536 void stat_diag (char const *name);
 537 void write_error_details (char const *, size_t, size_t);
 538 void write_fatal (char const *) __attribute__ ((noreturn));
 539 void write_fatal_details (char const *, ssize_t, size_t)
 540      __attribute__ ((noreturn));
 541
 542 pid_t xfork (void);
 543 void xpipe (int[2]);
 544
 545 void *page_aligned_alloc (void **, size_t);
 546
 547 /* Module names.c.  */
 548
 549 extern struct name *gnu_list_name;
 550
 551 void gid_to_gname (gid_t, char **gname);
 552 int gname_to_gid (char const *, gid_t *);
 553 void uid_to_uname (uid_t, char **uname);
 554 int uname_to_uid (char const *, uid_t *);
 555
 556 void init_names (void);
 557 void name_add (const char *);
 558 void name_init (void);
 559 void name_term (void);
 560 char *name_next (int);
 561 void name_gather (void);
 562 struct name *addname (char const *, int);
 563 int name_match (const char *);
 564 void names_notfound (void);
 565 void collect_and_sort_names (void);
 566 struct name *name_scan (const char *);
 567 char *name_from_list (void);
 568 void blank_name_list (void);
 569 char *new_name (const char *, const char *);
 570 size_t stripped_prefix_len (char const *file_name, size_t num);
 571 bool all_names_found (struct tar_stat_info *);
 572
 573 bool excluded_name (char const *);
 574
 575 void add_avoided_name (char const *);
 576 bool is_avoided_name (char const *);
 577 bool is_individual_file (char const *);
 578
 579 bool contains_dot_dot (char const *);
 580
 581 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 582                     (c)->found_count == occurrence_option)
 583 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 584                      (c)->found_count >= occurrence_option)
 585
 586 /* Module tar.c.  */
 587
 588 void usage (int);
 589
 590 int confirm (const char *, const char *);
 591 void request_stdin (const char *);
 592
 593 void tar_stat_init (struct tar_stat_info *st);
 594 void tar_stat_destroy (struct tar_stat_info *st);
 595 void usage (int) __attribute__ ((noreturn));
 596
 597 /* Module update.c.  */
 598
 599 extern char *output_start;
 600
 601 void update_archive (void);
 602
 603 /* Module xheader.c.  */
 604
 605 void xheader_decode (struct tar_stat_info *);
 606 void xheader_decode_global (void);
 607 void xheader_store (char const *, struct tar_stat_info const *, void *);
 608 void xheader_read (union block *, size_t);
 609 void xheader_write (char type, char *name, struct xheader *xhdr);
 610 void xheader_write_global (void);
 611 void xheader_finish (struct xheader *);
 612 void xheader_destroy (struct xheader *);
 613 char *xheader_xhdr_name (struct tar_stat_info *st);
 614 char *xheader_ghdr_name (void);
 615 void xheader_write (char, char *, struct xheader *);
 616 void xheader_write_global (void);
 617 void xheader_set_option (char *string);
 618
 619 /* Module system.c */
 620
 621 void sys_detect_dev_null_output (void);
 622 void sys_save_archive_dev_ino (void);
 623 void sys_drain_input_pipe (void);
 624 void sys_wait_for_child (pid_t);
 625 void sys_spawn_shell (void);
 626 bool sys_compare_uid (struct stat *a, struct stat *b);
 627 bool sys_compare_gid (struct stat *a, struct stat *b);
 628 bool sys_file_is_archive (struct tar_stat_info *p);
 629 bool sys_compare_links (struct stat *link_data, struct stat *stat_data);
 630 int sys_truncate (int fd);
 631 pid_t sys_child_open_for_compress (void);
 632 pid_t sys_child_open_for_uncompress (void);
 633 size_t sys_write_archive_buffer (void);
 634 bool sys_get_archive_stat (void);
 635 int sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st);
 636 void sys_wait_command (void);
 637
 638 /* Module compare.c */
 639 void report_difference (struct tar_stat_info *st, const char *message, ...);
 640
 641 /* Module sparse.c */
 642 bool sparse_file_p (struct tar_stat_info *);
 643 bool sparse_member_p (struct tar_stat_info *);
 644 bool sparse_fixup_header (struct tar_stat_info *);
 645 enum dump_status sparse_dump_file (int, struct tar_stat_info *);
 646 enum dump_status sparse_extract_file (int, struct tar_stat_info *, off_t *);
 647 enum dump_status sparse_skip_file (struct tar_stat_info *);
 648 bool sparse_diff_file (int, struct tar_stat_info *);
 649
 650 /* Module utf8.c */
 651 bool string_ascii_p (const char *str);
 652 bool utf8_convert (bool to_utf, char const *input, char **output);