1 /* Common declarations for the tar program.
3 Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001,
4 2003, 2004, 2005, 2006 Free 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 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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
34 /* Some various global definitions. */
36 /* Name of file to use for interacting with user. */
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. */
43 # define GLOBAL extern
46 #define TAREXIT_SUCCESS PAXEXIT_SUCCESS
47 #define TAREXIT_DIFFERS PAXEXIT_DIFFERS
48 #define TAREXIT_FAILURE PAXEXIT_FAILURE
52 #include <backupfile.h>
54 #include <full-write.h>
55 #include <modechange.h>
57 #include <safe-read.h>
58 #include <stat-time.h>
60 #define obstack_chunk_alloc xmalloc
61 #define obstack_chunk_free free
66 /* Log base 2 of common values. */
71 /* Information gleaned from the command line. */
73 /* Name of this program. */
74 GLOBAL
const char *program_name
;
76 /* Main command option. */
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 */
91 GLOBAL
enum subcommand subcommand_option
;
93 /* Selected format for output archive. */
94 GLOBAL
enum archive_format archive_format
;
96 /* Either NL or NUL, as decided by the --null option. */
97 GLOBAL
char filename_terminator
;
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
;
106 GLOBAL
bool absolute_names_option
;
108 /* Display file times in UTC */
109 GLOBAL
bool utc_option
;
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
;
120 replace_atime_preserve
,
121 system_atime_preserve
123 GLOBAL
enum atime_preserve atime_preserve_option
;
125 GLOBAL
bool backup_option
;
127 /* Type of backups being made. */
128 GLOBAL
enum backup_type backup_type
;
130 GLOBAL
bool block_number_option
;
132 GLOBAL
bool checkpoint_option
;
134 /* Specified name of compression program, or "gzip" as implied by -z. */
135 GLOBAL
const char *use_compress_program_option
;
137 GLOBAL
bool dereference_option
;
139 /* Print a message if not all links are dumped */
140 GLOBAL
int check_links_option
;
142 /* Patterns that match file names to be excluded. */
143 GLOBAL
struct exclude
*excluded
;
145 /* Exclude directories containing a cache directory tag. */
146 GLOBAL
bool exclude_caches_option
;
148 /* Specified value to be put into tar file in place of stat () results, or
149 just -1 if such an override should not take place. */
150 GLOBAL gid_t group_option
;
152 GLOBAL
bool ignore_failed_read_option
;
154 GLOBAL
bool ignore_zeros_option
;
156 GLOBAL
bool incremental_option
;
158 /* Specified name of script to run at end of each tape change. */
159 GLOBAL
const char *info_script_option
;
161 GLOBAL
bool interactive_option
;
163 /* If nonzero, extract only Nth occurrence of each named file */
164 GLOBAL
uintmax_t occurrence_option
;
168 DEFAULT_OLD_FILES
, /* default */
169 NO_OVERWRITE_DIR_OLD_FILES
, /* --no-overwrite-dir */
170 OVERWRITE_OLD_FILES
, /* --overwrite */
171 UNLINK_FIRST_OLD_FILES
, /* --unlink-first */
172 KEEP_OLD_FILES
, /* --keep-old-files */
173 KEEP_NEWER_FILES
/* --keep-newer-files */
175 GLOBAL
enum old_files old_files_option
;
177 /* Specified file name for incremental list. */
178 GLOBAL
const char *listed_incremental_option
;
180 /* Specified mode change string. */
181 GLOBAL
struct mode_change
*mode_option
;
183 /* Initial umask, if needed for mode change string. */
184 GLOBAL mode_t initial_umask
;
186 GLOBAL
bool multi_volume_option
;
188 /* Specified threshold date and time. Files having an older time stamp
189 do not get archived (also see after_date_option above). */
190 GLOBAL
struct timespec newer_mtime_option
;
192 /* Return true if newer_mtime_option is initialized. */
193 #define NEWER_OPTION_INITIALIZED(opt) (0 <= (opt).tv_nsec)
195 /* Return true if the struct stat ST's M time is less than
196 newer_mtime_option. */
197 #define OLDER_STAT_TIME(st, m) \
198 (timespec_cmp (get_stat_##m##time (&(st)), newer_mtime_option) < 0)
200 /* Likewise, for struct tar_stat_info ST. */
201 #define OLDER_TAR_STAT_TIME(st, m) \
202 (timespec_cmp ((st).m##time, newer_mtime_option) < 0)
204 /* Zero if there is no recursion, otherwise FNM_LEADING_DIR. */
205 GLOBAL
int recursion_option
;
207 GLOBAL
bool numeric_owner_option
;
209 GLOBAL
bool one_file_system_option
;
211 /* Specified value to be put into tar file in place of stat () results, or
212 just -1 if such an override should not take place. */
213 GLOBAL uid_t owner_option
;
215 GLOBAL
bool recursive_unlink_option
;
217 GLOBAL
bool read_full_records_option
;
219 GLOBAL
bool remove_files_option
;
221 /* Specified rmt command. */
222 GLOBAL
const char *rmt_command_option
;
224 /* Specified remote shell command. */
225 GLOBAL
const char *rsh_command_option
;
227 GLOBAL
bool same_order_option
;
229 /* If positive, preserve ownership when extracting. */
230 GLOBAL
int same_owner_option
;
232 /* If positive, preserve permissions when extracting. */
233 GLOBAL
int same_permissions_option
;
235 /* When set, strip the given number of file name components from the file name
237 GLOBAL
size_t strip_name_components
;
239 GLOBAL
bool show_omitted_dirs_option
;
241 GLOBAL
bool sparse_option
;
243 GLOBAL
bool starting_file_option
;
245 /* Specified maximum byte length of each tape volume (multiple of 1024). */
246 GLOBAL tarlong tape_length_option
;
248 GLOBAL
bool to_stdout_option
;
250 GLOBAL
bool totals_option
;
252 GLOBAL
bool touch_option
;
254 GLOBAL
char *to_command_option
;
255 GLOBAL
bool ignore_command_error_option
;
257 /* Restrict some potentially harmful tar options */
258 GLOBAL
bool restrict_option
;
260 /* Return true if the extracted files are not being written to disk */
261 #define EXTRACT_OVER_PIPE (to_stdout_option || to_command_option)
263 /* Count how many times the option has been set, multiple setting yields
264 more verbose behavior. Value 0 means no verbosity, 1 means file name
265 only, 2 means file name and all attributes. More than 2 is just like 2. */
266 GLOBAL
int verbose_option
;
268 GLOBAL
bool 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
bool dev_null_output
;
284 /* Timestamp for when we started execution. */
285 GLOBAL
struct timespec start_time
;
287 GLOBAL
struct tar_stat_info current_stat_info
;
289 /* List of tape drive names, number of such tape drives, allocated number,
290 and current cursor in list. */
291 GLOBAL
const char **archive_name_array
;
292 GLOBAL
size_t archive_names
;
293 GLOBAL
size_t allocated_archive_names
;
294 GLOBAL
const char **archive_name_cursor
;
296 /* Output index file name. */
297 GLOBAL
char const *index_file_name
;
299 /* Structure for keeping track of filenames and lists thereof. */
302 struct name
*next
; /* Link to the next element */
303 int change_dir
; /* Number of the directory to change to.
304 Set with the -C option. */
305 uintmax_t found_count
; /* number of times a matching file has
307 int explicit; /* this name was explicitely given in the
309 int matching_flags
; /* this name is a regexp, not literal */
310 char const *dir_contents
; /* for incremental_option */
312 size_t length
; /* cached strlen(name) */
316 /* Obnoxious test to see if dimwit is trying to dump the archive. */
320 GLOBAL
bool seekable_archive
;
322 GLOBAL dev_t root_device
;
324 /* Unquote filenames */
325 GLOBAL
bool unquote_option
;
327 GLOBAL
bool test_label_option
; /* Test archive volume label and exit */
329 /* When creating archive in verbose mode, list member names as stored in the
331 GLOBAL
bool show_stored_names_option
;
333 /* Delay setting modification times and permissions of extracted directories
334 until the end of extraction. This variable helps correctly restore directory
335 timestamps from archives with an unusual member order. It is automatically
336 set for incremental archives. */
337 GLOBAL
bool delay_directory_restore_option
;
339 /* Warn about implicit use of the wildcards in command line arguments.
340 (Default for tar prior to 1.15.91, but changed afterwards */
341 GLOBAL
bool warn_regex_usage
;
343 /* Declarations for each module. */
345 /* FIXME: compare.c should not directly handle the following variable,
346 instead, this should be done in buffer.c only. */
354 extern enum access_mode access_mode
;
356 /* Module buffer.c. */
359 extern bool write_archive_to_stdout
;
360 extern char *volume_label
;
361 extern char *continued_file_name
;
362 extern uintmax_t continued_file_size
;
363 extern uintmax_t continued_file_offset
;
365 size_t available_space_after (union block
*);
366 off_t
current_block_ordinal (void);
367 void close_archive (void);
368 void closeout_volume_number (void);
369 union block
*find_next_block (void);
370 void flush_read (void);
371 void flush_write (void);
372 void flush_archive (void);
373 void init_volume_number (void);
374 void open_archive (enum access_mode
);
375 void print_total_written (void);
376 void reset_eof (void);
377 void set_next_block_after (union block
*);
378 void clear_read_error_count (void);
379 void xclose (int fd
);
380 void archive_write_error (ssize_t
) __attribute__ ((noreturn
));
381 void archive_read_error (void);
382 off_t
seek_archive (off_t size
);
383 void set_start_time (void);
385 void mv_begin (struct tar_stat_info
*st
);
387 void mv_total_size (off_t size
);
388 void mv_size_left (off_t size
);
391 /* Module create.c. */
398 dump_status_not_implemented
401 bool file_dumpable_p (struct tar_stat_info
*);
402 void create_archive (void);
403 void pad_archive (off_t size_left
);
404 void dump_file (const char *, int, dev_t
);
405 union block
*start_header (struct tar_stat_info
*st
);
406 void finish_header (struct tar_stat_info
*, union block
*, off_t
);
407 void simple_finish_header (union block
*header
);
408 union block
* write_extended (bool global
, struct tar_stat_info
*st
,
409 union block
*old_header
);
410 union block
*start_private_header (const char *name
, size_t size
);
411 void write_eot (void);
412 void check_links (void);
414 #define GID_TO_CHARS(val, where) gid_to_chars (val, where, sizeof (where))
415 #define MAJOR_TO_CHARS(val, where) major_to_chars (val, where, sizeof (where))
416 #define MINOR_TO_CHARS(val, where) minor_to_chars (val, where, sizeof (where))
417 #define MODE_TO_CHARS(val, where) mode_to_chars (val, where, sizeof (where))
418 #define OFF_TO_CHARS(val, where) off_to_chars (val, where, sizeof (where))
419 #define SIZE_TO_CHARS(val, where) size_to_chars (val, where, sizeof (where))
420 #define TIME_TO_CHARS(val, where) time_to_chars (val, where, sizeof (where))
421 #define UID_TO_CHARS(val, where) uid_to_chars (val, where, sizeof (where))
422 #define UINTMAX_TO_CHARS(val, where) uintmax_to_chars (val, where, sizeof (where))
423 #define UNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
424 #define GNAME_TO_CHARS(name,buf) string_to_chars (name, buf, sizeof(buf))
426 bool gid_to_chars (gid_t
, char *, size_t);
427 bool major_to_chars (major_t
, char *, size_t);
428 bool minor_to_chars (minor_t
, char *, size_t);
429 bool mode_to_chars (mode_t
, char *, size_t);
430 bool off_to_chars (off_t
, char *, size_t);
431 bool size_to_chars (size_t, char *, size_t);
432 bool time_to_chars (time_t, char *, size_t);
433 bool uid_to_chars (uid_t
, char *, size_t);
434 bool uintmax_to_chars (uintmax_t, char *, size_t);
435 void string_to_chars (char const *, char *, size_t);
437 /* Module diffarch.c. */
439 extern bool now_verifying
;
441 void diff_archive (void);
442 void diff_init (void);
443 void verify_volume (void);
445 /* Module extract.c. */
447 void extr_init (void);
448 void extract_archive (void);
449 void extract_finish (void);
450 bool rename_directory (char *src
, char *dst
);
452 /* Module delete.c. */
454 void delete_archive_members (void);
456 /* Module incremen.c. */
458 char *get_directory_contents (char *, dev_t
);
459 const char *append_incremental_renames (const char *dump
);
460 void read_directory_file (void);
461 void write_directory_file (void);
462 void purge_directory (char const *);
463 void list_dumpdir (char *buffer
, size_t size
);
464 void update_parent_directory (const char *name
);
466 size_t dumpdir_size (const char *p
);
467 bool is_dumpdir (struct tar_stat_info
*stat_info
);
473 HEADER_STILL_UNREAD
, /* for when read_header has not been called */
474 HEADER_SUCCESS
, /* header successfully read and checksummed */
475 HEADER_SUCCESS_EXTENDED
, /* likewise, but we got an extended header */
476 HEADER_ZERO_BLOCK
, /* zero block where header expected */
477 HEADER_END_OF_FILE
, /* true end of file while header expected */
478 HEADER_FAILURE
/* ill-formed header, or bad checksum */
488 GLOBAL
struct xheader extended_header
;
489 extern union block
*current_header
;
490 extern enum archive_format current_format
;
491 extern size_t recent_long_name_blocks
;
492 extern size_t recent_long_link_blocks
;
494 void decode_header (union block
*, struct tar_stat_info
*,
495 enum archive_format
*, int);
496 char const *tartime (struct timespec
, bool);
498 #define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
499 #define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
500 #define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
501 #define MODE_FROM_HEADER(where) mode_from_header (where, sizeof (where))
502 #define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
503 #define SIZE_FROM_HEADER(where) size_from_header (where, sizeof (where))
504 #define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
505 #define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
506 #define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
508 gid_t
gid_from_header (const char *, size_t);
509 major_t
major_from_header (const char *, size_t);
510 minor_t
minor_from_header (const char *, size_t);
511 mode_t
mode_from_header (const char *, size_t);
512 off_t
off_from_header (const char *, size_t);
513 size_t size_from_header (const char *, size_t);
514 time_t time_from_header (const char *, size_t);
515 uid_t
uid_from_header (const char *, size_t);
516 uintmax_t uintmax_from_header (const char *, size_t);
518 void list_archive (void);
519 void print_for_mkdir (char *, int, mode_t
);
520 void print_header (struct tar_stat_info
*, off_t
);
521 void read_and (void (*) (void));
522 enum read_header
read_header_primitive (bool raw_extended_headers
,
523 struct tar_stat_info
*info
);
524 enum read_header
read_header (bool);
525 enum read_header
tar_checksum (union block
*header
, bool silent
);
526 void skip_file (off_t
);
527 void skip_member (void);
529 /* Module mangle.c. */
531 void extract_mangle (void);
535 void assign_string (char **, const char *);
536 char *quote_copy_string (const char *);
537 int unquote_string (char *);
539 void code_ns_fraction (int, char *);
540 char const *code_timespec (struct timespec
, char *);
541 enum { BILLION
= 1000000000, LOG10_BILLION
= 9 };
542 enum { TIMESPEC_STRSIZE_BOUND
=
543 UINTMAX_STRSIZE_BOUND
+ LOG10_BILLION
+ sizeof "-." - 1 };
545 size_t dot_dot_prefix_len (char const *);
549 ORDINARY_REMOVE_OPTION
,
550 RECURSIVE_REMOVE_OPTION
,
552 /* FIXME: The following value is never used. It seems to be intended
553 as a placeholder for a hypothetical option that should instruct tar
554 to recursively remove subdirectories in purge_directory(),
555 as opposed to the functionality of --recursive-unlink
556 (RECURSIVE_REMOVE_OPTION value), which removes them in
557 prepare_to_extract() phase. However, with the addition of more
558 meta-info to the incremental dumps, this should become unnecessary */
559 WANT_DIRECTORY_REMOVE_OPTION
561 int remove_any_file (const char *, enum remove_option
);
562 bool maybe_backup_file (const char *, int);
563 void undo_last_backup (void);
565 int deref_stat (bool, char const *, struct stat
*);
567 int chdir_arg (char const *);
570 void close_diag (char const *name
);
571 void open_diag (char const *name
);
572 void read_diag_details (char const *name
, off_t offset
, size_t size
);
573 void readlink_diag (char const *name
);
574 void savedir_diag (char const *name
);
575 void seek_diag_details (char const *, off_t
);
576 void stat_diag (char const *name
);
577 void write_error_details (char const *, size_t, size_t);
578 void write_fatal (char const *) __attribute__ ((noreturn
));
579 void write_fatal_details (char const *, ssize_t
, size_t)
580 __attribute__ ((noreturn
));
585 void *page_aligned_alloc (void **, size_t);
586 int set_file_atime (int fd
, char const *file
,
587 struct timespec
const timespec
[2]);
589 /* Module names.c. */
591 extern struct name
*gnu_list_name
;
593 void gid_to_gname (gid_t
, char **gname
);
594 int gname_to_gid (char const *, gid_t
*);
595 void uid_to_uname (uid_t
, char **uname
);
596 int uname_to_uid (char const *, uid_t
*);
598 void init_names (void);
599 void name_add_name (const char *, int);
600 void name_add_dir (const char *name
);
601 void name_term (void);
602 const char *name_next (int);
603 void name_gather (void);
604 struct name
*addname (char const *, int);
605 int name_match (const char *);
606 void names_notfound (void);
607 void collect_and_sort_names (void);
608 struct name
*name_scan (const char *, bool);
609 char *name_from_list (void);
610 void blank_name_list (void);
611 char *new_name (const char *, const char *);
612 size_t stripped_prefix_len (char const *file_name
, size_t num
);
613 bool all_names_found (struct tar_stat_info
*);
615 bool excluded_name (char const *);
617 void add_avoided_name (char const *);
618 bool is_avoided_name (char const *);
619 bool is_individual_file (char const *);
621 bool contains_dot_dot (char const *);
623 #define ISFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
624 (c)->found_count == occurrence_option)
625 #define WASFOUND(c) ((occurrence_option == 0) ? (c)->found_count : \
626 (c)->found_count >= occurrence_option)
632 int confirm (const char *, const char *);
633 void request_stdin (const char *);
635 void tar_stat_init (struct tar_stat_info
*st
);
636 void tar_stat_destroy (struct tar_stat_info
*st
);
637 void usage (int) __attribute__ ((noreturn
));
638 int tar_timespec_cmp (struct timespec a
, struct timespec b
);
639 const char *archive_format_string (enum archive_format fmt
);
640 const char *subcommand_string (enum subcommand c
);
642 /* Module update.c. */
644 extern char *output_start
;
646 void update_archive (void);
648 /* Module xheader.c. */
650 void xheader_decode (struct tar_stat_info
*);
651 void xheader_decode_global (void);
652 void xheader_store (char const *, struct tar_stat_info
const *, void const *);
653 void xheader_read (union block
*, size_t);
654 void xheader_write (char type
, char *name
, struct xheader
*xhdr
);
655 void xheader_write_global (void);
656 void xheader_finish (struct xheader
*);
657 void xheader_destroy (struct xheader
*);
658 char *xheader_xhdr_name (struct tar_stat_info
*st
);
659 char *xheader_ghdr_name (void);
660 void xheader_write (char, char *, struct xheader
*);
661 void xheader_write_global (void);
662 void xheader_set_option (char *string
);
663 void xheader_string_begin (void);
664 void xheader_string_add (char const *s
);
665 void xheader_string_end (char const *keyword
);
666 bool xheader_keyword_deleted_p (const char *kw
);
667 char *xheader_format_name (struct tar_stat_info
*st
, const char *fmt
,
670 /* Module system.c */
672 void sys_detect_dev_null_output (void);
673 void sys_save_archive_dev_ino (void);
674 void sys_drain_input_pipe (void);
675 void sys_wait_for_child (pid_t
);
676 void sys_spawn_shell (void);
677 bool sys_compare_uid (struct stat
*a
, struct stat
*b
);
678 bool sys_compare_gid (struct stat
*a
, struct stat
*b
);
679 bool sys_file_is_archive (struct tar_stat_info
*p
);
680 bool sys_compare_links (struct stat
*link_data
, struct stat
*stat_data
);
681 int sys_truncate (int fd
);
682 pid_t
sys_child_open_for_compress (void);
683 pid_t
sys_child_open_for_uncompress (void);
684 size_t sys_write_archive_buffer (void);
685 bool sys_get_archive_stat (void);
686 int sys_exec_command (char *file_name
, int typechar
, struct tar_stat_info
*st
);
687 void sys_wait_command (void);
688 int sys_exec_info_script (const char **archive_name
, int volume_number
);
690 /* Module compare.c */
691 void report_difference (struct tar_stat_info
*st
, const char *message
, ...);
693 /* Module sparse.c */
694 bool sparse_file_p (struct tar_stat_info
*);
695 bool sparse_member_p (struct tar_stat_info
*);
696 bool sparse_fixup_header (struct tar_stat_info
*);
697 enum dump_status
sparse_dump_file (int, struct tar_stat_info
*);
698 enum dump_status
sparse_extract_file (int, struct tar_stat_info
*, off_t
*);
699 enum dump_status
sparse_skip_file (struct tar_stat_info
*);
700 bool sparse_diff_file (int, struct tar_stat_info
*);
703 bool string_ascii_p (const char *str
);
704 bool utf8_convert (bool to_utf
, char const *input
, char **output
);