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 Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 2, or (at your option) any later
   9    version.
  10
  11    This program is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  14    Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License along
  17    with this program; if not, write to the Free Software Foundation, Inc.,
  18    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* Declare the GNU tar archive format.  */
  21 #include "tar.h"
  22
  23 /* The checksum field is filled with this while the checksum is computed.  */
  24 #define CHKBLANKS       "        "      /* 8 blanks, no null */
  25
  26 /* Some constants from POSIX are given names.  */
  27 #define NAME_FIELD_SIZE   100
  28 #define PREFIX_FIELD_SIZE 155
  29 #define UNAME_FIELD_SIZE   32
  30 #define GNAME_FIELD_SIZE   32
  31
  32 /* FIXME */
  33 #define MAXOCTAL11      017777777777L
  34 #define MAXOCTAL7       07777777
  35
  36
  37 \f
  38 /* Some various global definitions.  */
  39
  40 /* Name of file to use for interacting with user.  */
  41 #if MSDOS
  42 # define TTY_NAME "con"
  43 #else
  44 # define TTY_NAME "/dev/tty"
  45 #endif
  46
  47 /* GLOBAL is defined to empty in tar.c only, and left alone in other *.c
  48    modules.  Here, we merely set it to "extern" if it is not already set.
  49    GNU tar does depend on the system loader to preset all GLOBAL variables to
  50    neutral (or zero) values, explicit initialization is usually not done.  */
  51 #ifndef GLOBAL
  52 # define GLOBAL extern
  53 #endif
  54
  55 /* Exit status for GNU tar.  Let's try to keep this list as simple as
  56    possible.  -d option strongly invites a status different for unequal
  57    comparison and other errors.  */
  58 GLOBAL int exit_status;
  59
  60 #define TAREXIT_SUCCESS 0
  61 #define TAREXIT_DIFFERS 1
  62 #define TAREXIT_FAILURE 2
  63
  64 /* Both WARN and ERROR write a message on stderr and continue processing,
  65    however ERROR manages so tar will exit unsuccessfully.  FATAL_ERROR
  66    writes a message on stderr and aborts immediately, with another message
  67    line telling so.  USAGE_ERROR works like FATAL_ERROR except that the
  68    other message line suggests trying --help.  All four macros accept a
  69    single argument of the form ((0, errno, _("FORMAT"), Args...)).  errno
  70    is zero when the error is not being detected by the system.  */
  71
  72 #define WARN(Args) \
  73   error Args
  74 #define ERROR(Args) \
  75   (error Args, exit_status = TAREXIT_FAILURE)
  76 #define FATAL_ERROR(Args) \
  77   (error Args, fatal_exit ())
  78 #define USAGE_ERROR(Args) \
  79   (error Args, usage (TAREXIT_FAILURE))
  80 \f
  81 #include "arith.h"
  82 #include <backupfile.h>
  83 #include <exclude.h>
  84 #include <full-write.h>
  85 #include <modechange.h>
  86 #include <quote.h>
  87 #include <safe-read.h>
  88
  89 /* Log base 2 of common values.  */
  90 #define LG_8 3
  91 #define LG_64 6
  92 #define LG_256 8
  93 \f
  94 /* Information gleaned from the command line.  */
  95
  96 /* Name of this program.  */
  97 GLOBAL const char *program_name;
  98
  99 /* Main command option.  */
 100
 101 enum subcommand
 102 {
 103   UNKNOWN_SUBCOMMAND,           /* none of the following */
 104   APPEND_SUBCOMMAND,            /* -r */
 105   CAT_SUBCOMMAND,               /* -A */
 106   CREATE_SUBCOMMAND,            /* -c */
 107   DELETE_SUBCOMMAND,            /* -D */
 108   DIFF_SUBCOMMAND,              /* -d */
 109   EXTRACT_SUBCOMMAND,           /* -x */
 110   LIST_SUBCOMMAND,              /* -t */
 111   UPDATE_SUBCOMMAND             /* -u */
 112 };
 113
 114 GLOBAL enum subcommand subcommand_option;
 115
 116 /* Selected format for output archive.  */
 117 GLOBAL enum archive_format archive_format;
 118
 119 /* Either NL or NUL, as decided by the --null option.  */
 120 GLOBAL char filename_terminator;
 121
 122 /* Size of each record, once in blocks, once in bytes.  Those two variables
 123    are always related, the second being BLOCKSIZE times the first.  They do
 124    not have _option in their name, even if their values is derived from
 125    option decoding, as these are especially important in tar.  */
 126 GLOBAL int blocking_factor;
 127 GLOBAL size_t record_size;
 128
 129 GLOBAL bool absolute_names_option;
 130
 131 /* Display file times in UTC */
 132 GLOBAL bool utc_option;
 133
 134 /* This variable tells how to interpret newer_mtime_option, below.  If zero,
 135    files get archived if their mtime is not less than newer_mtime_option.
 136    If nonzero, files get archived if *either* their ctime or mtime is not less
 137    than newer_mtime_option.  */
 138 GLOBAL int after_date_option;
 139
 140 GLOBAL bool atime_preserve_option;
 141
 142 GLOBAL bool backup_option;
 143
 144 /* Type of backups being made.  */
 145 GLOBAL enum backup_type backup_type;
 146
 147 GLOBAL bool block_number_option;
 148
 149 GLOBAL bool checkpoint_option;
 150
 151 /* Specified name of compression program, or "gzip" as implied by -z.  */
 152 GLOBAL const char *use_compress_program_option;
 153
 154 GLOBAL bool dereference_option;
 155
 156 /* Print a message if not all links are dumped */
 157 GLOBAL int check_links_option;
 158
 159 /* Patterns that match file names to be excluded.  */
 160 GLOBAL struct exclude *excluded;
 161
 162 /* Specified file containing names to work on.  */
 163 GLOBAL const char *files_from_option;
 164
 165 GLOBAL bool force_local_option;
 166
 167 /* Specified value to be put into tar file in place of stat () results, or
 168    just -1 if such an override should not take place.  */
 169 GLOBAL gid_t group_option;
 170
 171 GLOBAL bool ignore_failed_read_option;
 172
 173 GLOBAL bool ignore_zeros_option;
 174
 175 GLOBAL bool incremental_option;
 176
 177 /* Specified name of script to run at end of each tape change.  */
 178 GLOBAL const char *info_script_option;
 179
 180 GLOBAL bool interactive_option;
 181
 182 /* If nonzero, extract only Nth occurrence of each named file */
 183 GLOBAL uintmax_t occurrence_option;
 184
 185 enum old_files
 186 {
 187   DEFAULT_OLD_FILES,          /* default */
 188   NO_OVERWRITE_DIR_OLD_FILES, /* --no-overwrite-dir */
 189   OVERWRITE_OLD_FILES,        /* --overwrite */
 190   UNLINK_FIRST_OLD_FILES,     /* --unlink-first */
 191   KEEP_OLD_FILES,             /* --keep-old-files */
 192   KEEP_NEWER_FILES,           /* --keep-newer-files */
 193 };
 194 GLOBAL enum old_files old_files_option;
 195
 196 /* Specified file name for incremental list.  */
 197 GLOBAL const char *listed_incremental_option;
 198
 199 /* Specified mode change string.  */
 200 GLOBAL struct mode_change *mode_option;
 201
 202 GLOBAL bool multi_volume_option;
 203
 204 /* The same variable hold the time, whether mtime or ctime.  Just fake a
 205    non-existing option, for making the code clearer, elsewhere.  */
 206 #define newer_ctime_option newer_mtime_option
 207
 208 /* Specified threshold date and time.  Files having an older time stamp
 209    do not get archived (also see after_date_option above).  */
 210 GLOBAL time_t newer_mtime_option;
 211
 212 /* Zero if there is no recursion, otherwise FNM_LEADING_DIR.  */
 213 GLOBAL int recursion_option;
 214
 215 GLOBAL bool numeric_owner_option;
 216
 217 GLOBAL bool one_file_system_option;
 218
 219 /* Specified value to be put into tar file in place of stat () results, or
 220    just -1 if such an override should not take place.  */
 221 GLOBAL uid_t owner_option;
 222
 223 GLOBAL bool recursive_unlink_option;
 224
 225 GLOBAL bool read_full_records_option;
 226
 227 GLOBAL bool remove_files_option;
 228
 229 /* Specified remote shell command.  */
 230 GLOBAL const char *rsh_command_option;
 231
 232 GLOBAL bool same_order_option;
 233
 234 /* If positive, preserve ownership when extracting.  */
 235 GLOBAL int same_owner_option;
 236
 237 /* If positive, preserve permissions when extracting.  */
 238 GLOBAL int same_permissions_option;
 239
 240 /* When set, strip the given number of path elements from the file name
 241    before extracting */
 242 GLOBAL size_t strip_path_elements;
 243
 244 GLOBAL bool show_omitted_dirs_option;
 245
 246 GLOBAL bool sparse_option;
 247
 248 GLOBAL bool starting_file_option;
 249
 250 /* Specified maximum byte length of each tape volume (multiple of 1024).  */
 251 GLOBAL tarlong tape_length_option;
 252
 253 GLOBAL bool to_stdout_option;
 254
 255 GLOBAL bool totals_option;
 256
 257 GLOBAL bool touch_option;
 258
 259 /* Count how many times the option has been set, multiple setting yields
 260    more verbose behavior.  Value 0 means no verbosity, 1 means file name
 261    only, 2 means file name and all attributes.  More than 2 is just like 2.  */
 262 GLOBAL int verbose_option;
 263
 264 GLOBAL bool verify_option;
 265
 266 /* Specified name of file containing the volume number.  */
 267 GLOBAL const char *volno_file_option;
 268
 269 /* Specified value or pattern.  */
 270 GLOBAL const char *volume_label_option;
 271 \f
 272 /* Other global variables.  */
 273
 274 /* File descriptor for archive file.  */
 275 GLOBAL int archive;
 276
 277 /* Nonzero when outputting to /dev/null.  */
 278 GLOBAL bool dev_null_output;
 279
 280 /* Timestamp for when we started execution.  */
 281 #if HAVE_CLOCK_GETTIME
 282   GLOBAL struct timespec start_timespec;
 283 # define start_time (start_timespec.tv_sec)
 284 #else
 285   GLOBAL time_t start_time;
 286 #endif
 287
 288 GLOBAL struct tar_stat_info current_stat_info;
 289
 290 /* List of tape drive names, number of such tape drives, allocated number,
 291    and current cursor in list.  */
 292 GLOBAL const char **archive_name_array;
 293 GLOBAL int archive_names;
 294 GLOBAL int allocated_archive_names;
 295 GLOBAL const char **archive_name_cursor;
 296
 297 /* Output index file name.  */
 298 GLOBAL char const *index_file_name;
 299
 300 /* Structure for keeping track of filenames and lists thereof.  */
 301 struct name
 302   {
 303     struct name *next;
 304     size_t length;              /* cached strlen(name) */
 305     uintmax_t found_count;      /* number of times a matching file has
 306                                    been found */
 307     int isdir;
 308     char firstch;               /* first char is literally matched */
 309     char regexp;                /* this name is a regexp, not literal */
 310     int change_dir;             /* set with the -C option */
 311     char const *dir_contents;   /* for incremental_option */
 312     char fake;                  /* dummy entry */
 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 \f
 321 /* Declarations for each module.  */
 322
 323 /* FIXME: compare.c should not directly handle the following variable,
 324    instead, this should be done in buffer.c only.  */
 325
 326 enum access_mode
 327 {
 328   ACCESS_READ,
 329   ACCESS_WRITE,
 330   ACCESS_UPDATE
 331 };
 332 extern enum access_mode access_mode;
 333
 334 /* Module buffer.c.  */
 335
 336 extern FILE *stdlis;
 337 extern char *save_name;
 338 extern off_t save_sizeleft;
 339 extern off_t save_totsize;
 340 extern bool write_archive_to_stdout;
 341
 342 size_t available_space_after (union block *);
 343 off_t current_block_ordinal (void);
 344 void close_archive (void);
 345 void closeout_volume_number (void);
 346 union block *find_next_block (void);
 347 void flush_read (void);
 348 void flush_write (void);
 349 void flush_archive (void);
 350 void init_volume_number (void);
 351 void open_archive (enum access_mode);
 352 void print_total_written (void);
 353 void reset_eof (void);
 354 void set_next_block_after (union block *);
 355 void clear_read_error_count (void);
 356 void xclose (int fd);
 357 void archive_write_error (ssize_t) __attribute__ ((noreturn));
 358 void archive_read_error (void);
 359
 360 /* Module create.c.  */
 361
 362 enum dump_status
 363   {
 364     dump_status_ok,
 365     dump_status_short,
 366     dump_status_fail,
 367     dump_status_not_implemented
 368   };
 369
 370 bool file_dumpable_p (struct tar_stat_info *stat);
 371 void create_archive (void);
 372 void pad_archive (off_t size_left);
 373 void dump_file (char *, int, dev_t);
 374 union block *start_header (struct tar_stat_info *st);
 375 void finish_header (struct tar_stat_info *, union block *, off_t);
 376 void simple_finish_header (union block *header);
 377 union block *start_private_header (const char *name, size_t size);
 378 void write_eot (void);
 379 void check_links (void);
 380
 381 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
 382 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
 383 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
 384 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
 385 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
 386 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
 387 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
 388 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
 389 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
 390 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 391 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 392
 393 void gid_to_chars (gid_t, char *, size_t);
 394 void major_to_chars (major_t, char *, size_t);
 395 void minor_to_chars (minor_t, char *, size_t);
 396 void mode_to_chars (mode_t, char *, size_t);
 397 void off_to_chars (off_t, char *, size_t);
 398 void size_to_chars (size_t, char *, size_t);
 399 void time_to_chars (time_t, char *, size_t);
 400 void uid_to_chars (uid_t, char *, size_t);
 401 void uintmax_to_chars (uintmax_t, char *, size_t);
 402 void string_to_chars (char *, char *, size_t);
 403
 404 /* Module diffarch.c.  */
 405
 406 extern bool now_verifying;
 407
 408 void diff_archive (void);
 409 void diff_init (void);
 410 void verify_volume (void);
 411
 412 /* Module extract.c.  */
 413
 414 extern bool we_are_root;
 415 void extr_init (void);
 416 void extract_archive (void);
 417 void extract_finish (void);
 418 void fatal_exit (void) __attribute__ ((noreturn));
 419
 420 /* Module delete.c.  */
 421
 422 void delete_archive_members (void);
 423
 424 /* Module incremen.c.  */
 425
 426 char *get_directory_contents (char *, dev_t);
 427 void read_directory_file (void);
 428 void write_directory_file (void);
 429 void gnu_restore (char const *);
 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 #define STRINGIFY_BIGINT(i, b) \
 459   stringify_uintmax_t_backwards ((uintmax_t) (i), (b) + UINTMAX_STRSIZE_BOUND)
 460 char *stringify_uintmax_t_backwards (uintmax_t, char *);
 461 char const *tartime (time_t);
 462
 463 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
 464 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
 465 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
 466 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
 467 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
 468 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
 469 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
 470 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
 471 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
 472
 473 gid_t gid_from_header (const char *, size_t);
 474 major_t major_from_header (const char *, size_t);
 475 minor_t minor_from_header (const char *, size_t);
 476 mode_t mode_from_header (const char *, size_t);
 477 off_t off_from_header (const char *, size_t);
 478 size_t size_from_header (const char *, size_t);
 479 time_t time_from_header (const char *, size_t);
 480 uid_t uid_from_header (const char *, size_t);
 481 uintmax_t uintmax_from_header (const char *, size_t);
 482
 483 void list_archive (void);
 484 void print_for_mkdir (char *, int, mode_t);
 485 void print_header (struct tar_stat_info *, off_t);
 486 void read_and (void (*) (void));
 487 enum read_header read_header (bool);
 488 void skip_file (off_t);
 489 void skip_member (void);
 490
 491 /* Module mangle.c.  */
 492
 493 void extract_mangle (void);
 494
 495 /* Module misc.c.  */
 496
 497 void assign_string (char **, const char *);
 498 char *quote_copy_string (const char *);
 499 int unquote_string (char *);
 500
 501 size_t dot_dot_prefix_len (char const *);
 502
 503 enum remove_option
 504 {
 505   ORDINARY_REMOVE_OPTION,
 506   RECURSIVE_REMOVE_OPTION,
 507   WANT_DIRECTORY_REMOVE_OPTION
 508 };
 509 int remove_any_file (const char *, enum remove_option);
 510 bool maybe_backup_file (const char *, int);
 511 void undo_last_backup (void);
 512
 513 int deref_stat (bool, char const *, struct stat *);
 514
 515 int chdir_arg (char const *);
 516 void chdir_do (int);
 517
 518 void decode_mode (mode_t, char *);
 519
 520 void chdir_fatal (char const *) __attribute__ ((noreturn));
 521 void chmod_error_details (char const *, mode_t);
 522 void chown_error_details (char const *, uid_t, gid_t);
 523 void close_error (char const *);
 524 void close_warn (char const *);
 525 void close_diag (char const *name);
 526 void exec_fatal (char const *) __attribute__ ((noreturn));
 527 void link_error (char const *, char const *);
 528 void mkdir_error (char const *);
 529 void mkfifo_error (char const *);
 530 void mknod_error (char const *);
 531 void open_error (char const *);
 532 void open_fatal (char const *) __attribute__ ((noreturn));
 533 void open_warn (char const *);
 534 void open_diag (char const *name);
 535 void read_error (char const *);
 536 void read_error_details (char const *, off_t, size_t);
 537 void read_fatal (char const *) __attribute__ ((noreturn));
 538 void read_fatal_details (char const *, off_t, size_t);
 539 void read_warn_details (char const *, off_t, size_t);
 540 void read_diag_details (char const *name, off_t offset, size_t size);
 541 void readlink_error (char const *);
 542 void readlink_warn (char const *);
 543 void readlink_diag (char const *name);
 544 void savedir_error (char const *);
 545 void savedir_warn (char const *);
 546 void savedir_diag (char const *name);
 547 void seek_error (char const *);
 548 void seek_error_details (char const *, off_t);
 549 void seek_warn (char const *);
 550 void seek_warn_details (char const *, off_t);
 551 void seek_diag_details (char const *, off_t);
 552 void stat_error (char const *);
 553 void stat_warn (char const *);
 554 void stat_diag (char const *name);
 555 void symlink_error (char const *, char const *);
 556 void truncate_error (char const *);
 557 void truncate_warn (char const *);
 558 void unlink_error (char const *);
 559 void utime_error (char const *);
 560 void waitpid_error (char const *);
 561 void write_error (char const *);
 562 void write_error_details (char const *, ssize_t, size_t);
 563 void write_fatal (char const *) __attribute__ ((noreturn));
 564 void write_fatal_details (char const *, ssize_t, size_t)
 565      __attribute__ ((noreturn));
 566
 567 pid_t xfork (void);
 568 void xpipe (int[2]);
 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 *gname, gid_t *);
 576 void uid_to_uname (uid_t, char **uname);
 577 int uname_to_uid (char *uname, uid_t *);
 578
 579 void init_names (void);
 580 void name_add (const char *);
 581 void name_init (int, char *const *);
 582 void name_term (void);
 583 char *name_next (int);
 584 void name_close (void);
 585 void name_gather (void);
 586 struct name *addname (char const *, int);
 587 int name_match (const char *);
 588 void names_notfound (void);
 589 void collect_and_sort_names (void);
 590 struct name *name_scan (const char *);
 591 char *name_from_list (void);
 592 void blank_name_list (void);
 593 char *new_name (const char *, const char *);
 594 char *safer_name_suffix (char const *, bool);
 595 size_t stripped_prefix_len (char const *file_name, size_t num);
 596 bool all_names_found (struct tar_stat_info *);
 597
 598 bool excluded_name (char const *);
 599
 600 void add_avoided_name (char const *);
 601 bool is_avoided_name (char const *);
 602
 603 bool contains_dot_dot (char const *);
 604
 605 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 606                     (c)->found_count == occurrence_option)
 607 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 608                      (c)->found_count >= occurrence_option)
 609
 610 /* Module tar.c.  */
 611
 612 int confirm (const char *, const char *);
 613 void request_stdin (const char *);
 614
 615 void tar_stat_init (struct tar_stat_info *st);
 616 void tar_stat_destroy (struct tar_stat_info *st);
 617 void usage (int) __attribute__ ((noreturn));
 618
 619 /* Module update.c.  */
 620
 621 extern char *output_start;
 622
 623 void update_archive (void);
 624
 625 /* Module xheader.c.  */
 626
 627 void xheader_decode (struct tar_stat_info *);
 628 void xheader_decode_global (void);
 629 void xheader_store (char const *, struct tar_stat_info const *, void *);
 630 void xheader_read (union block *, size_t);
 631 void xheader_write (char type, char *name, struct xheader *xhdr);
 632 void xheader_write_global (void);
 633 void xheader_finish (struct xheader *);
 634 void xheader_destroy (struct xheader *);
 635 char *xheader_xhdr_name (struct tar_stat_info *st);
 636 char *xheader_ghdr_name (void);
 637 void xheader_set_option (char *string);
 638
 639 /* Module system.c */
 640
 641 void sys_stat_nanoseconds (struct tar_stat_info *stat);
 642 void sys_detect_dev_null_output (void);
 643 void sys_save_archive_dev_ino (void);
 644 void sys_drain_input_pipe (void);
 645 void sys_wait_for_child (pid_t);
 646 void sys_spawn_shell (void);
 647 bool sys_compare_uid (struct stat *a, struct stat *b);
 648 bool sys_compare_gid (struct stat *a, struct stat *b);
 649 bool sys_file_is_archive (struct tar_stat_info *p);
 650 bool sys_compare_links (struct stat *link_data, struct stat *stat_data);
 651 int sys_truncate (int fd);
 652 void sys_reset_uid_gid (void);
 653 pid_t sys_child_open_for_compress (void);
 654 pid_t sys_child_open_for_uncompress (void);
 655 ssize_t sys_write_archive_buffer (void);
 656 bool sys_get_archive_stat (void);
 657 void sys_reset_uid_gid (void);
 658
 659 /* Module compare.c */
 660 void report_difference (struct tar_stat_info *st, const char *message, ...);
 661
 662 /* Module sparse.c */
 663 bool sparse_file_p (struct tar_stat_info *stat);
 664 bool sparse_member_p (struct tar_stat_info *stat);
 665 bool sparse_fixup_header (struct tar_stat_info *stat);
 666 enum dump_status sparse_dump_file (int fd, struct tar_stat_info *stat);
 667 enum dump_status sparse_extract_file (int fd, struct tar_stat_info *stat, off_t *size);
 668 enum dump_status sparse_skip_file (struct tar_stat_info *stat);
 669 bool sparse_diff_file (int fd, struct tar_stat_info *stat);
 670
 671 /* Module utf8.c */
 672 bool string_ascii_p (const char *str);
 673 bool utf8_convert(bool to_utf, const char *input, char **output);