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 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 #include <timespec.h>
  89
  90 /* Log base 2 of common values.  */
  91 #define LG_8 3
  92 #define LG_64 6
  93 #define LG_256 8
  94 \f
  95 /* Information gleaned from the command line.  */
  96
  97 /* Name of this program.  */
  98 GLOBAL const char *program_name;
  99
 100 /* Main command option.  */
 101
 102 enum subcommand
 103 {
 104   UNKNOWN_SUBCOMMAND,           /* none of the following */
 105   APPEND_SUBCOMMAND,            /* -r */
 106   CAT_SUBCOMMAND,               /* -A */
 107   CREATE_SUBCOMMAND,            /* -c */
 108   DELETE_SUBCOMMAND,            /* -D */
 109   DIFF_SUBCOMMAND,              /* -d */
 110   EXTRACT_SUBCOMMAND,           /* -x */
 111   LIST_SUBCOMMAND,              /* -t */
 112   UPDATE_SUBCOMMAND             /* -u */
 113 };
 114
 115 GLOBAL enum subcommand subcommand_option;
 116
 117 /* Selected format for output archive.  */
 118 GLOBAL enum archive_format archive_format;
 119
 120 /* Either NL or NUL, as decided by the --null option.  */
 121 GLOBAL char filename_terminator;
 122
 123 /* Size of each record, once in blocks, once in bytes.  Those two variables
 124    are always related, the second being BLOCKSIZE times the first.  They do
 125    not have _option in their name, even if their values is derived from
 126    option decoding, as these are especially important in tar.  */
 127 GLOBAL int blocking_factor;
 128 GLOBAL size_t record_size;
 129
 130 GLOBAL bool absolute_names_option;
 131
 132 /* Display file times in UTC */
 133 GLOBAL bool utc_option;
 134
 135 /* This variable tells how to interpret newer_mtime_option, below.  If zero,
 136    files get archived if their mtime is not less than newer_mtime_option.
 137    If nonzero, files get archived if *either* their ctime or mtime is not less
 138    than newer_mtime_option.  */
 139 GLOBAL int after_date_option;
 140
 141 GLOBAL bool atime_preserve_option;
 142
 143 GLOBAL bool backup_option;
 144
 145 /* Type of backups being made.  */
 146 GLOBAL enum backup_type backup_type;
 147
 148 GLOBAL bool block_number_option;
 149
 150 GLOBAL bool checkpoint_option;
 151
 152 /* Specified name of compression program, or "gzip" as implied by -z.  */
 153 GLOBAL const char *use_compress_program_option;
 154
 155 GLOBAL bool dereference_option;
 156
 157 /* Print a message if not all links are dumped */
 158 GLOBAL int check_links_option;
 159
 160 /* Patterns that match file names to be excluded.  */
 161 GLOBAL struct exclude *excluded;
 162
 163 /* Specified file containing names to work on.  */
 164 GLOBAL const char *files_from_option;
 165
 166 GLOBAL bool force_local_option;
 167
 168 /* Specified value to be put into tar file in place of stat () results, or
 169    just -1 if such an override should not take place.  */
 170 GLOBAL gid_t group_option;
 171
 172 GLOBAL bool ignore_failed_read_option;
 173
 174 GLOBAL bool ignore_zeros_option;
 175
 176 GLOBAL bool incremental_option;
 177
 178 /* Specified name of script to run at end of each tape change.  */
 179 GLOBAL const char *info_script_option;
 180
 181 GLOBAL bool interactive_option;
 182
 183 /* If nonzero, extract only Nth occurrence of each named file */
 184 GLOBAL uintmax_t occurrence_option;
 185
 186 enum old_files
 187 {
 188   DEFAULT_OLD_FILES,          /* default */
 189   NO_OVERWRITE_DIR_OLD_FILES, /* --no-overwrite-dir */
 190   OVERWRITE_OLD_FILES,        /* --overwrite */
 191   UNLINK_FIRST_OLD_FILES,     /* --unlink-first */
 192   KEEP_OLD_FILES,             /* --keep-old-files */
 193   KEEP_NEWER_FILES            /* --keep-newer-files */
 194 };
 195 GLOBAL enum old_files old_files_option;
 196
 197 /* Specified file name for incremental list.  */
 198 GLOBAL const char *listed_incremental_option;
 199
 200 /* Specified mode change string.  */
 201 GLOBAL struct mode_change *mode_option;
 202
 203 GLOBAL bool multi_volume_option;
 204
 205 /* The same variable holds the time, whether mtime or ctime.  Just fake a
 206    non-existing option, for making the code clearer, elsewhere.  */
 207 #define newer_ctime_option newer_mtime_option
 208
 209 /* Specified threshold date and time.  Files having an older time stamp
 210    do not get archived (also see after_date_option above).  */
 211 GLOBAL struct timespec newer_mtime_option;
 212
 213 /* Return true if newer_mtime_option is initialized.  */
 214 #define NEWER_OPTION_INITIALIZED(opt) (0 <= (opt).tv_nsec)
 215
 216 /* Return true if the struct stat ST's M time is less than
 217    newer_mtime_option.  */
 218 #define OLDER_STAT_TIME(st, m) \
 219   ((st).st_##m##time < newer_mtime_option.tv_sec \
 220    || ((st).st_##m##time == newer_mtime_option.tv_sec \
 221        && TIMESPEC_NS ((st).st_##m##tim) < newer_mtime_option.tv_nsec))
 222
 223 /* Zero if there is no recursion, otherwise FNM_LEADING_DIR.  */
 224 GLOBAL int recursion_option;
 225
 226 GLOBAL bool numeric_owner_option;
 227
 228 GLOBAL bool one_file_system_option;
 229
 230 /* Specified value to be put into tar file in place of stat () results, or
 231    just -1 if such an override should not take place.  */
 232 GLOBAL uid_t owner_option;
 233
 234 GLOBAL bool recursive_unlink_option;
 235
 236 GLOBAL bool read_full_records_option;
 237
 238 GLOBAL bool remove_files_option;
 239
 240 /* Specified remote shell command.  */
 241 GLOBAL const char *rsh_command_option;
 242
 243 GLOBAL bool same_order_option;
 244
 245 /* If positive, preserve ownership when extracting.  */
 246 GLOBAL int same_owner_option;
 247
 248 /* If positive, preserve permissions when extracting.  */
 249 GLOBAL int same_permissions_option;
 250
 251 /* When set, strip the given number of path elements from the file name
 252    before extracting */
 253 GLOBAL size_t strip_path_elements;
 254
 255 GLOBAL bool show_omitted_dirs_option;
 256
 257 GLOBAL bool sparse_option;
 258
 259 GLOBAL bool starting_file_option;
 260
 261 /* Specified maximum byte length of each tape volume (multiple of 1024).  */
 262 GLOBAL tarlong tape_length_option;
 263
 264 GLOBAL bool to_stdout_option;
 265
 266 GLOBAL bool totals_option;
 267
 268 GLOBAL bool touch_option;
 269
 270 /* Count how many times the option has been set, multiple setting yields
 271    more verbose behavior.  Value 0 means no verbosity, 1 means file name
 272    only, 2 means file name and all attributes.  More than 2 is just like 2.  */
 273 GLOBAL int verbose_option;
 274
 275 GLOBAL bool verify_option;
 276
 277 /* Specified name of file containing the volume number.  */
 278 GLOBAL const char *volno_file_option;
 279
 280 /* Specified value or pattern.  */
 281 GLOBAL const char *volume_label_option;
 282 \f
 283 /* Other global variables.  */
 284
 285 /* File descriptor for archive file.  */
 286 GLOBAL int archive;
 287
 288 /* Nonzero when outputting to /dev/null.  */
 289 GLOBAL bool dev_null_output;
 290
 291 /* Timestamp for when we started execution.  */
 292 #if HAVE_CLOCK_GETTIME
 293   GLOBAL struct timespec start_timespec;
 294 # define start_time (start_timespec.tv_sec)
 295 #else
 296   GLOBAL time_t start_time;
 297 #endif
 298
 299 GLOBAL struct tar_stat_info current_stat_info;
 300
 301 /* List of tape drive names, number of such tape drives, allocated number,
 302    and current cursor in list.  */
 303 GLOBAL const char **archive_name_array;
 304 GLOBAL int archive_names;
 305 GLOBAL int allocated_archive_names;
 306 GLOBAL const char **archive_name_cursor;
 307
 308 /* Output index file name.  */
 309 GLOBAL char const *index_file_name;
 310
 311 /* Structure for keeping track of filenames and lists thereof.  */
 312 struct name
 313   {
 314     struct name *next;
 315     size_t length;              /* cached strlen(name) */
 316     uintmax_t found_count;      /* number of times a matching file has
 317                                    been found */
 318     int isdir;
 319     char firstch;               /* first char is literally matched */
 320     char regexp;                /* this name is a regexp, not literal */
 321     int change_dir;             /* set with the -C option */
 322     char const *dir_contents;   /* for incremental_option */
 323     char fake;                  /* dummy entry */
 324     char name[1];
 325   };
 326
 327 /* Obnoxious test to see if dimwit is trying to dump the archive.  */
 328 GLOBAL dev_t ar_dev;
 329 GLOBAL ino_t ar_ino;
 330
 331 \f
 332 /* Declarations for each module.  */
 333
 334 /* FIXME: compare.c should not directly handle the following variable,
 335    instead, this should be done in buffer.c only.  */
 336
 337 enum access_mode
 338 {
 339   ACCESS_READ,
 340   ACCESS_WRITE,
 341   ACCESS_UPDATE
 342 };
 343 extern enum access_mode access_mode;
 344
 345 /* Module buffer.c.  */
 346
 347 extern FILE *stdlis;
 348 extern char *save_name;
 349 extern off_t save_sizeleft;
 350 extern off_t save_totsize;
 351 extern bool write_archive_to_stdout;
 352
 353 size_t available_space_after (union block *);
 354 off_t current_block_ordinal (void);
 355 void close_archive (void);
 356 void closeout_volume_number (void);
 357 union block *find_next_block (void);
 358 void flush_read (void);
 359 void flush_write (void);
 360 void flush_archive (void);
 361 void init_volume_number (void);
 362 void open_archive (enum access_mode);
 363 void print_total_written (void);
 364 void reset_eof (void);
 365 void set_next_block_after (union block *);
 366 void clear_read_error_count (void);
 367 void xclose (int fd);
 368 void archive_write_error (ssize_t) __attribute__ ((noreturn));
 369 void archive_read_error (void);
 370
 371 /* Module create.c.  */
 372
 373 enum dump_status
 374   {
 375     dump_status_ok,
 376     dump_status_short,
 377     dump_status_fail,
 378     dump_status_not_implemented
 379   };
 380
 381 bool file_dumpable_p (struct tar_stat_info *);
 382 void create_archive (void);
 383 void pad_archive (off_t size_left);
 384 void dump_file (char *, int, dev_t);
 385 union block *start_header (struct tar_stat_info *st);
 386 void finish_header (struct tar_stat_info *, union block *, off_t);
 387 void simple_finish_header (union block *header);
 388 union block *start_private_header (const char *name, size_t size);
 389 void write_eot (void);
 390 void check_links (void);
 391
 392 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
 393 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
 394 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
 395 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
 396 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
 397 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
 398 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
 399 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
 400 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
 401 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 402 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
 403
 404 void gid_to_chars (gid_t, char *, size_t);
 405 void major_to_chars (major_t, char *, size_t);
 406 void minor_to_chars (minor_t, char *, size_t);
 407 void mode_to_chars (mode_t, char *, size_t);
 408 void off_to_chars (off_t, char *, size_t);
 409 void size_to_chars (size_t, char *, size_t);
 410 void time_to_chars (time_t, char *, size_t);
 411 void uid_to_chars (uid_t, char *, size_t);
 412 void uintmax_to_chars (uintmax_t, char *, size_t);
 413 void string_to_chars (char *, char *, size_t);
 414
 415 /* Module diffarch.c.  */
 416
 417 extern bool now_verifying;
 418
 419 void diff_archive (void);
 420 void diff_init (void);
 421 void verify_volume (void);
 422
 423 /* Module extract.c.  */
 424
 425 extern bool we_are_root;
 426 void extr_init (void);
 427 void extract_archive (void);
 428 void extract_finish (void);
 429 void fatal_exit (void) __attribute__ ((noreturn));
 430
 431 /* Module delete.c.  */
 432
 433 void delete_archive_members (void);
 434
 435 /* Module incremen.c.  */
 436
 437 char *get_directory_contents (char *, dev_t);
 438 void read_directory_file (void);
 439 void write_directory_file (void);
 440 void gnu_restore (char const *);
 441
 442 /* Module list.c.  */
 443
 444 enum read_header
 445 {
 446   HEADER_STILL_UNREAD,          /* for when read_header has not been called */
 447   HEADER_SUCCESS,               /* header successfully read and checksummed */
 448   HEADER_SUCCESS_EXTENDED,      /* likewise, but we got an extended header */
 449   HEADER_ZERO_BLOCK,            /* zero block where header expected */
 450   HEADER_END_OF_FILE,           /* true end of file while header expected */
 451   HEADER_FAILURE                /* ill-formed header, or bad checksum */
 452 };
 453
 454 struct xheader
 455 {
 456   struct obstack *stk;
 457   size_t size;
 458   char *buffer;
 459 };
 460
 461 GLOBAL struct xheader extended_header;
 462 extern union block *current_header;
 463 extern enum archive_format current_format;
 464 extern size_t recent_long_name_blocks;
 465 extern size_t recent_long_link_blocks;
 466
 467 void decode_header (union block *, struct tar_stat_info *,
 468                     enum archive_format *, int);
 469 #define STRINGIFY_BIGINT(i, b) \
 470   stringify_uintmax_t_backwards ((uintmax_t) (i), (b) + UINTMAX_STRSIZE_BOUND)
 471 char *stringify_uintmax_t_backwards (uintmax_t, char *);
 472 char const *tartime (time_t);
 473
 474 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
 475 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
 476 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
 477 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
 478 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
 479 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
 480 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
 481 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
 482 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
 483
 484 gid_t gid_from_header (const char *, size_t);
 485 major_t major_from_header (const char *, size_t);
 486 minor_t minor_from_header (const char *, size_t);
 487 mode_t mode_from_header (const char *, size_t);
 488 off_t off_from_header (const char *, size_t);
 489 size_t size_from_header (const char *, size_t);
 490 time_t time_from_header (const char *, size_t);
 491 uid_t uid_from_header (const char *, size_t);
 492 uintmax_t uintmax_from_header (const char *, size_t);
 493
 494 void list_archive (void);
 495 void print_for_mkdir (char *, int, mode_t);
 496 void print_header (struct tar_stat_info *, off_t);
 497 void read_and (void (*) (void));
 498 enum read_header read_header (bool);
 499 void skip_file (off_t);
 500 void skip_member (void);
 501
 502 /* Module mangle.c.  */
 503
 504 void extract_mangle (void);
 505
 506 /* Module misc.c.  */
 507
 508 void assign_string (char **, const char *);
 509 char *quote_copy_string (const char *);
 510 int unquote_string (char *);
 511
 512 size_t dot_dot_prefix_len (char const *);
 513
 514 enum remove_option
 515 {
 516   ORDINARY_REMOVE_OPTION,
 517   RECURSIVE_REMOVE_OPTION,
 518   WANT_DIRECTORY_REMOVE_OPTION
 519 };
 520 int remove_any_file (const char *, enum remove_option);
 521 bool maybe_backup_file (const char *, int);
 522 void undo_last_backup (void);
 523
 524 int deref_stat (bool, char const *, struct stat *);
 525
 526 int chdir_arg (char const *);
 527 void chdir_do (int);
 528
 529 void decode_mode (mode_t, char *);
 530
 531 void chdir_fatal (char const *) __attribute__ ((noreturn));
 532 void chmod_error_details (char const *, mode_t);
 533 void chown_error_details (char const *, uid_t, gid_t);
 534 void close_error (char const *);
 535 void close_warn (char const *);
 536 void close_diag (char const *name);
 537 void exec_fatal (char const *) __attribute__ ((noreturn));
 538 void link_error (char const *, char const *);
 539 void mkdir_error (char const *);
 540 void mkfifo_error (char const *);
 541 void mknod_error (char const *);
 542 void open_error (char const *);
 543 void open_fatal (char const *) __attribute__ ((noreturn));
 544 void open_warn (char const *);
 545 void open_diag (char const *name);
 546 void read_error (char const *);
 547 void read_error_details (char const *, off_t, size_t);
 548 void read_fatal (char const *) __attribute__ ((noreturn));
 549 void read_fatal_details (char const *, off_t, size_t) __attribute__ ((noreturn));
 550 void read_warn_details (char const *, off_t, size_t);
 551 void read_diag_details (char const *name, off_t offset, size_t size);
 552 void readlink_error (char const *);
 553 void readlink_warn (char const *);
 554 void readlink_diag (char const *name);
 555 void savedir_error (char const *);
 556 void savedir_warn (char const *);
 557 void savedir_diag (char const *name);
 558 void seek_error (char const *);
 559 void seek_error_details (char const *, off_t);
 560 void seek_warn (char const *);
 561 void seek_warn_details (char const *, off_t);
 562 void seek_diag_details (char const *, off_t);
 563 void stat_error (char const *);
 564 void stat_warn (char const *);
 565 void stat_diag (char const *name);
 566 void symlink_error (char const *, char const *);
 567 void truncate_error (char const *);
 568 void truncate_warn (char const *);
 569 void unlink_error (char const *);
 570 void utime_error (char const *);
 571 void waitpid_error (char const *);
 572 void write_error (char const *);
 573 void write_error_details (char const *, size_t, size_t);
 574 void write_fatal (char const *) __attribute__ ((noreturn));
 575 void write_fatal_details (char const *, ssize_t, size_t)
 576      __attribute__ ((noreturn));
 577
 578 pid_t xfork (void);
 579 void xpipe (int[2]);
 580
 581 /* Module names.c.  */
 582
 583 extern struct name *gnu_list_name;
 584
 585 void gid_to_gname (gid_t, char **gname);
 586 int gname_to_gid (char const *, gid_t *);
 587 void uid_to_uname (uid_t, char **uname);
 588 int uname_to_uid (char const *, uid_t *);
 589
 590 void init_names (void);
 591 void name_add (const char *);
 592 void name_init (void);
 593 void name_term (void);
 594 char *name_next (int);
 595 void name_close (void);
 596 void name_gather (void);
 597 struct name *addname (char const *, int);
 598 int name_match (const char *);
 599 void names_notfound (void);
 600 void collect_and_sort_names (void);
 601 struct name *name_scan (const char *);
 602 char *name_from_list (void);
 603 void blank_name_list (void);
 604 char *new_name (const char *, const char *);
 605 char *safer_name_suffix (char const *, bool);
 606 size_t stripped_prefix_len (char const *file_name, size_t num);
 607 bool all_names_found (struct tar_stat_info *);
 608
 609 bool excluded_name (char const *);
 610
 611 void add_avoided_name (char const *);
 612 bool is_avoided_name (char const *);
 613
 614 bool contains_dot_dot (char const *);
 615
 616 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 617                     (c)->found_count == occurrence_option)
 618 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
 619                      (c)->found_count >= occurrence_option)
 620
 621 /* Module tar.c.  */
 622
 623 void usage (int);
 624
 625 int confirm (const char *, const char *);
 626 void request_stdin (const char *);
 627
 628 void tar_stat_init (struct tar_stat_info *st);
 629 void tar_stat_destroy (struct tar_stat_info *st);
 630 void usage (int) __attribute__ ((noreturn));
 631
 632 /* Module update.c.  */
 633
 634 extern char *output_start;
 635
 636 void update_archive (void);
 637
 638 /* Module xheader.c.  */
 639
 640 void xheader_decode (struct tar_stat_info *);
 641 void xheader_decode_global (void);
 642 void xheader_store (char const *, struct tar_stat_info const *, void *);
 643 void xheader_read (union block *, size_t);
 644 void xheader_write (char type, char *name, struct xheader *xhdr);
 645 void xheader_write_global (void);
 646 void xheader_finish (struct xheader *);
 647 void xheader_destroy (struct xheader *);
 648 char *xheader_xhdr_name (struct tar_stat_info *st);
 649 char *xheader_ghdr_name (void);
 650 void xheader_write (char, char *, struct xheader *);
 651 void xheader_write_global (void);
 652 void xheader_set_option (char *string);
 653
 654 /* Module system.c */
 655
 656 void sys_stat_nanoseconds (struct tar_stat_info *);
 657 void sys_detect_dev_null_output (void);
 658 void sys_save_archive_dev_ino (void);
 659 void sys_drain_input_pipe (void);
 660 void sys_wait_for_child (pid_t);
 661 void sys_spawn_shell (void);
 662 bool sys_compare_uid (struct stat *a, struct stat *b);
 663 bool sys_compare_gid (struct stat *a, struct stat *b);
 664 bool sys_file_is_archive (struct tar_stat_info *p);
 665 bool sys_compare_links (struct stat *link_data, struct stat *stat_data);
 666 int sys_truncate (int fd);
 667 void sys_reset_uid_gid (void);
 668 pid_t sys_child_open_for_compress (void);
 669 pid_t sys_child_open_for_uncompress (void);
 670 void sys_reset_uid_gid (void);
 671 size_t sys_write_archive_buffer (void);
 672 bool sys_get_archive_stat (void);
 673 void sys_reset_uid_gid (void);
 674
 675 /* Module compare.c */
 676 void report_difference (struct tar_stat_info *st, const char *message, ...);
 677
 678 /* Module sparse.c */
 679 bool sparse_file_p (struct tar_stat_info *);
 680 bool sparse_member_p (struct tar_stat_info *);
 681 bool sparse_fixup_header (struct tar_stat_info *);
 682 enum dump_status sparse_dump_file (int, struct tar_stat_info *);
 683 enum dump_status sparse_extract_file (int, struct tar_stat_info *, off_t *);
 684 enum dump_status sparse_skip_file (struct tar_stat_info *);
 685 bool sparse_diff_file (int, struct tar_stat_info *);
 686
 687 /* Module utf8.c */
 688 bool string_ascii_p (const char *str);
 689 bool utf8_convert (bool to_utf, char const *input, char **output);