1 /* Common declarations for the tar program.
3 Copyright 1988, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001 Free
4 Software Foundation, Inc.
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
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.
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. */
20 /* Declare the GNU tar archive format. */
23 /* The checksum field is filled with this while the checksum is computed. */
24 #define CHKBLANKS " " /* 8 blanks, no null */
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
32 /* Some various global definitions. */
34 /* Name of file to use for interacting with user. */
36 # define TTY_NAME "con"
38 # define TTY_NAME "/dev/tty"
41 /* GLOBAL is defined to empty in tar.c only, and left alone in other *.c
42 modules. Here, we merely set it to "extern" if it is not already set.
43 GNU tar does depend on the system loader to preset all GLOBAL variables to
44 neutral (or zero) values, explicit initialization is usually not done. */
46 # define GLOBAL extern
49 /* Exit status for GNU tar. Let's try to keep this list as simple as
50 possible. -d option strongly invites a status different for unequal
51 comparison and other errors. */
52 GLOBAL int exit_status;
54 #define TAREXIT_SUCCESS 0
55 #define TAREXIT_DIFFERS 1
56 #define TAREXIT_FAILURE 2
58 /* Both WARN and ERROR write a message on stderr and continue processing,
59 however ERROR manages so tar will exit unsuccessfully. FATAL_ERROR
60 writes a message on stderr and aborts immediately, with another message
61 line telling so. USAGE_ERROR works like FATAL_ERROR except that the
62 other message line suggests trying --help. All four macros accept a
63 single argument of the form ((0, errno, _("FORMAT"), Args...)). errno
64 is zero when the error is not being detected by the system. */
69 (error Args, exit_status = TAREXIT_FAILURE)
70 #define FATAL_ERROR(Args) \
71 (error Args, fatal_exit ())
72 #define USAGE_ERROR(Args) \
73 (error Args, usage (TAREXIT_FAILURE))
75 /* Information gleaned from the command line. */
78 #include <backupfile.h>
80 #include <modechange.h>
81 #include <safe-read.h>
82 #include <full-write.h>
84 /* Log base 2 of common values. */
89 /* Name of this program. */
90 GLOBAL const char *program_name;
92 /* Main command option. */
96 UNKNOWN_SUBCOMMAND, /* none of the following */
97 APPEND_SUBCOMMAND, /* -r */
98 CAT_SUBCOMMAND, /* -A */
99 CREATE_SUBCOMMAND, /* -c */
100 DELETE_SUBCOMMAND, /* -D */
101 DIFF_SUBCOMMAND, /* -d */
102 EXTRACT_SUBCOMMAND, /* -x */
103 LIST_SUBCOMMAND, /* -t */
104 UPDATE_SUBCOMMAND /* -u */
107 GLOBAL enum subcommand subcommand_option;
109 /* Selected format for output archive. */
110 GLOBAL enum archive_format archive_format;
112 /* Either NL or NUL, as decided by the --null option. */
113 GLOBAL char filename_terminator;
115 /* Size of each record, once in blocks, once in bytes. Those two variables
116 are always related, the second being BLOCKSIZE times the first. They do
117 not have _option in their name, even if their values is derived from
118 option decoding, as these are especially important in tar. */
119 GLOBAL int blocking_factor;
120 GLOBAL size_t record_size;
123 GLOBAL int absolute_names_option;
125 /* This variable tells how to interpret newer_mtime_option, below. If zero,
126 files get archived if their mtime is not less than newer_mtime_option.
127 If nonzero, files get archived if *either* their ctime or mtime is not less
128 than newer_mtime_option. */
129 GLOBAL int after_date_option;
132 GLOBAL int atime_preserve_option;
135 GLOBAL int backup_option;
137 /* Type of backups being made. */
138 GLOBAL enum backup_type backup_type;
141 GLOBAL int block_number_option;
144 GLOBAL int checkpoint_option;
146 /* Specified name of compression program, or "gzip" as implied by -z. */
147 GLOBAL const char *use_compress_program_option;
150 GLOBAL int dereference_option;
152 /* Patterns that match file names to be excluded. */
153 GLOBAL struct exclude *excluded;
155 /* Specified file containing names to work on. */
156 GLOBAL const char *files_from_option;
159 GLOBAL int force_local_option;
161 /* Specified value to be put into tar file in place of stat () results, or
162 just -1 if such an override should not take place. */
163 GLOBAL gid_t group_option;
166 GLOBAL int ignore_failed_read_option;
169 GLOBAL int ignore_zeros_option;
172 GLOBAL int incremental_option;
174 /* Specified name of script to run at end of each tape change. */
175 GLOBAL const char *info_script_option;
178 GLOBAL int interactive_option;
182 DEFAULT_OLD_FILES, /* default */
183 UNLINK_FIRST_OLD_FILES, /* --unlink-first */
184 KEEP_OLD_FILES, /* --keep-old-files */
185 OVERWRITE_OLD_DIRS, /* --overwrite-dir */
186 OVERWRITE_OLD_FILES /* --overwrite */
188 GLOBAL enum old_files old_files_option;
190 /* Specified file name for incremental list. */
191 GLOBAL const char *listed_incremental_option;
193 /* Specified mode change string. */
194 GLOBAL struct mode_change *mode_option;
197 GLOBAL int multi_volume_option;
199 /* The same variable hold the time, whether mtime or ctime. Just fake a
200 non-existing option, for making the code clearer, elsewhere. */
201 #define newer_ctime_option newer_mtime_option
203 /* Specified threshold date and time. Files having an older time stamp
204 do not get archived (also see after_date_option above). */
205 GLOBAL time_t newer_mtime_option;
207 /* Zero if there is no recursion, otherwise FNM_LEADING_DIR. */
208 GLOBAL int recursion_option;
211 GLOBAL int numeric_owner_option;
214 GLOBAL int one_file_system_option;
216 /* Specified value to be put into tar file in place of stat () results, or
217 just -1 if such an override should not take place. */
218 GLOBAL uid_t owner_option;
221 GLOBAL int recursive_unlink_option;
224 GLOBAL int read_full_records_option;
227 GLOBAL int remove_files_option;
229 /* Specified remote shell command. */
230 GLOBAL const char *rsh_command_option;
233 GLOBAL int same_order_option;
235 /* If positive, preserve ownership when extracting. */
236 GLOBAL int same_owner_option;
238 /* If positive, preserve permissions when extracting. */
239 GLOBAL int same_permissions_option;
242 GLOBAL int show_omitted_dirs_option;
245 GLOBAL int sparse_option;
248 GLOBAL int starting_file_option;
250 /* Specified maximum byte length of each tape volume (multiple of 1024). */
251 GLOBAL tarlong tape_length_option;
254 GLOBAL int to_stdout_option;
257 GLOBAL int totals_option;
260 GLOBAL int touch_option;
262 /* Count how many times the option has been set, multiple setting yields
263 more verbose behavior. Value 0 means no verbosity, 1 means file name
264 only, 2 means file name and all attributes. More than 2 is just like 2. */
265 GLOBAL int verbose_option;
268 GLOBAL int verify_option;
270 /* Specified name of file containing the volume number. */
271 GLOBAL const char *volno_file_option;
273 /* Specified value or pattern. */
274 GLOBAL const char *volume_label_option;
276 /* Other global variables. */
278 /* File descriptor for archive file. */
281 /* Nonzero when outputting to /dev/null. */
282 GLOBAL int dev_null_output;
284 /* Timestamp for when we started execution. */
285 #if HAVE_CLOCK_GETTIME
286 GLOBAL struct timespec start_timespec;
287 # define start_time (start_timespec.tv_sec)
289 GLOBAL time_t start_time;
292 /* Name of file for the current archive entry. */
293 GLOBAL char *current_file_name;
295 /* Name of link for the current archive entry. */
296 GLOBAL char *current_link_name;
298 /* List of tape drive names, number of such tape drives, allocated number,
299 and current cursor in list. */
300 GLOBAL const char **archive_name_array;
301 GLOBAL int archive_names;
302 GLOBAL int allocated_archive_names;
303 GLOBAL const char **archive_name_cursor;
305 /* Structure for keeping track of filenames and lists thereof. */
309 size_t length; /* cached strlen(name) */
310 char found; /* a matching file has been found */
311 char firstch; /* first char is literally matched */
312 char regexp; /* this name is a regexp, not literal */
313 int change_dir; /* set with the -C option */
314 char const *dir_contents; /* for incremental_option */
315 char fake; /* dummy entry */
319 /* Information about a sparse file. */
325 GLOBAL struct sp_array *sparsearray;
327 /* Number of elements in sparsearray. */
328 GLOBAL int sp_array_size;
330 /* Declarations for each module. */
332 /* FIXME: compare.c should not directly handle the following variable,
333 instead, this should be done in buffer.c only. */
341 extern enum access_mode access_mode;
343 /* Module buffer.c. */
346 extern char *save_name;
347 extern off_t save_sizeleft;
348 extern off_t save_totsize;
349 extern bool write_archive_to_stdout;
351 size_t available_space_after PARAMS ((union block *));
352 off_t current_block_ordinal PARAMS ((void));
353 void close_archive PARAMS ((void));
354 void closeout_volume_number PARAMS ((void));
355 union block *find_next_block PARAMS ((void));
356 void flush_read PARAMS ((void));
357 void flush_write PARAMS ((void));
358 void flush_archive PARAMS ((void));
359 void init_volume_number PARAMS ((void));
360 void open_archive PARAMS ((enum access_mode));
361 void print_total_written PARAMS ((void));
362 void reset_eof PARAMS ((void));
363 void set_next_block_after PARAMS ((union block *));
365 /* Module create.c. */
367 void create_archive PARAMS ((void));
368 void dump_file PARAMS ((char *, int, dev_t));
369 void finish_header PARAMS ((union block *));
370 void write_eot PARAMS ((void));
372 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
373 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
374 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
375 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
376 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
377 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
378 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
379 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
380 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
382 void gid_to_chars PARAMS ((gid_t, char *, size_t));
383 void major_to_chars PARAMS ((major_t, char *, size_t));
384 void minor_to_chars PARAMS ((minor_t, char *, size_t));
385 void mode_to_chars PARAMS ((mode_t, char *, size_t));
386 void off_to_chars PARAMS ((off_t, char *, size_t));
387 void size_to_chars PARAMS ((size_t, char *, size_t));
388 void time_to_chars PARAMS ((time_t, char *, size_t));
389 void uid_to_chars PARAMS ((uid_t, char *, size_t));
390 void uintmax_to_chars PARAMS ((uintmax_t, char *, size_t));
392 /* Module diffarch.c. */
394 extern int now_verifying;
396 void diff_archive PARAMS ((void));
397 void diff_init PARAMS ((void));
398 void verify_volume PARAMS ((void));
400 /* Module extract.c. */
402 extern int we_are_root;
403 void extr_init PARAMS ((void));
404 void extract_archive PARAMS ((void));
405 void extract_finish PARAMS ((void));
406 void fatal_exit PARAMS ((void)) __attribute__ ((noreturn));
408 /* Module delete.c. */
410 void delete_archive_members PARAMS ((void));
412 /* Module incremen.c. */
414 char *get_directory_contents PARAMS ((char *, dev_t));
415 void read_directory_file PARAMS ((void));
416 void write_directory_file PARAMS ((void));
417 void gnu_restore PARAMS ((size_t));
423 HEADER_STILL_UNREAD, /* for when read_header has not been called */
424 HEADER_SUCCESS, /* header successfully read and checksummed */
425 HEADER_SUCCESS_EXTENDED, /* likewise, but we got an extended header */
426 HEADER_ZERO_BLOCK, /* zero block where header expected */
427 HEADER_END_OF_FILE, /* true end of file while header expected */
428 HEADER_FAILURE /* ill-formed header, or bad checksum */
431 extern union block *current_header;
432 extern struct stat current_stat;
433 extern enum archive_format current_format;
435 void decode_header PARAMS ((union block *, struct stat *,
436 enum archive_format *, int));
437 #define STRINGIFY_BIGINT(i, b) \
438 stringify_uintmax_t_backwards ((uintmax_t) (i), (b) + UINTMAX_STRSIZE_BOUND)
439 char *stringify_uintmax_t_backwards PARAMS ((uintmax_t, char *));
440 char const *tartime PARAMS ((time_t));
442 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
443 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
444 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
445 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
446 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
447 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
448 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
449 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
450 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
452 gid_t gid_from_header PARAMS ((const char *, size_t));
453 major_t major_from_header PARAMS ((const char *, size_t));
454 minor_t minor_from_header PARAMS ((const char *, size_t));
455 mode_t mode_from_header PARAMS ((const char *, size_t));
456 off_t off_from_header PARAMS ((const char *, size_t));
457 size_t size_from_header PARAMS ((const char *, size_t));
458 time_t time_from_header PARAMS ((const char *, size_t));
459 uid_t uid_from_header PARAMS ((const char *, size_t));
460 uintmax_t uintmax_from_header PARAMS ((const char *, size_t));
462 void list_archive PARAMS ((void));
463 void print_for_mkdir PARAMS ((char *, int, mode_t));
464 void print_header PARAMS ((void));
465 void read_and PARAMS ((void (*do_) ()));
466 enum read_header read_header PARAMS ((bool));
467 void skip_file PARAMS ((off_t));
468 void skip_member PARAMS ((void));
470 /* Module mangle.c. */
472 void extract_mangle PARAMS ((void));
476 void assign_string PARAMS ((char **, const char *));
477 char *quote_copy_string PARAMS ((const char *));
478 int unquote_string PARAMS ((char *));
480 int contains_dot_dot PARAMS ((char const *));
482 int remove_any_file PARAMS ((const char *, int));
483 int maybe_backup_file PARAMS ((const char *, int));
484 void undo_last_backup PARAMS ((void));
486 int deref_stat PARAMS ((int, char const *, struct stat *));
488 int chdir_arg PARAMS ((char const *));
489 void chdir_do PARAMS ((int));
491 void decode_mode PARAMS ((mode_t, char *));
493 void chdir_fatal PARAMS ((char const *)) __attribute__ ((noreturn));
494 void chmod_error_details PARAMS ((char const *, mode_t));
495 void chown_error_details PARAMS ((char const *, uid_t, gid_t));
496 void close_error PARAMS ((char const *));
497 void close_warn PARAMS ((char const *));
498 void exec_fatal PARAMS ((char const *)) __attribute__ ((noreturn));
499 void link_error PARAMS ((char const *, char const *));
500 void mkdir_error PARAMS ((char const *));
501 void mkfifo_error PARAMS ((char const *));
502 void mknod_error PARAMS ((char const *));
503 void open_error PARAMS ((char const *));
504 void open_fatal PARAMS ((char const *)) __attribute__ ((noreturn));
505 void open_warn PARAMS ((char const *));
506 void read_error PARAMS ((char const *));
507 void read_error_details PARAMS ((char const *, off_t, size_t));
508 void read_fatal PARAMS ((char const *)) __attribute__ ((noreturn));
509 void read_fatal_details PARAMS ((char const *, off_t, size_t));
510 void read_warn_details PARAMS ((char const *, off_t, size_t));
511 void readlink_error PARAMS ((char const *));
512 void readlink_warn PARAMS ((char const *));
513 void savedir_error PARAMS ((char const *));
514 void savedir_warn PARAMS ((char const *));
515 void seek_error PARAMS ((char const *));
516 void seek_error_details PARAMS ((char const *, off_t));
517 void seek_warn PARAMS ((char const *));
518 void seek_warn_details PARAMS ((char const *, off_t));
519 void stat_error PARAMS ((char const *));
520 void stat_warn PARAMS ((char const *));
521 void symlink_error PARAMS ((char const *, char const *));
522 void truncate_error PARAMS ((char const *));
523 void truncate_warn PARAMS ((char const *));
524 void unlink_error PARAMS ((char const *));
525 void utime_error PARAMS ((char const *));
526 void waitpid_error PARAMS ((char const *));
527 void write_error PARAMS ((char const *));
528 void write_error_details PARAMS ((char const *, ssize_t, size_t));
529 void write_fatal PARAMS ((char const *)) __attribute__ ((noreturn));
530 void write_fatal_details PARAMS ((char const *, ssize_t, size_t))
531 __attribute__ ((noreturn));
533 pid_t xfork PARAMS ((void));
534 void xpipe PARAMS ((int[2]));
536 char const *quote PARAMS ((char const *));
537 char const *quote_n PARAMS ((int, char const *));
539 /* Module names.c. */
541 extern struct name *gnu_list_name;
543 void gid_to_gname PARAMS ((gid_t, char gname[GNAME_FIELD_SIZE]));
544 int gname_to_gid PARAMS ((char gname[GNAME_FIELD_SIZE], gid_t *));
545 void uid_to_uname PARAMS ((uid_t, char uname[UNAME_FIELD_SIZE]));
546 int uname_to_uid PARAMS ((char uname[UNAME_FIELD_SIZE], uid_t *));
548 void init_names PARAMS ((void));
549 void name_add PARAMS ((const char *));
550 void name_init PARAMS ((int, char *const *));
551 void name_term PARAMS ((void));
552 char *name_next PARAMS ((int));
553 void name_close PARAMS ((void));
554 void name_gather PARAMS ((void));
555 struct name *addname PARAMS ((char const *, int));
556 int name_match PARAMS ((const char *));
557 void names_notfound PARAMS ((void));
558 void collect_and_sort_names PARAMS ((void));
559 struct name *name_scan PARAMS ((const char *));
560 char *name_from_list PARAMS ((void));
561 void blank_name_list PARAMS ((void));
562 char *new_name PARAMS ((const char *, const char *));
564 bool excluded_name PARAMS ((char const *));
566 void add_avoided_name PARAMS ((char const *));
567 int is_avoided_name PARAMS ((char const *));
571 int confirm PARAMS ((const char *, const char *));
572 void request_stdin PARAMS ((const char *));
574 /* Module update.c. */
576 extern char *output_start;
578 void update_archive PARAMS ((void));