1 /* File IO for GNU Emacs.
3 Copyright (C) 1985-1988, 1993-2016 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or (at
10 your option) any later version.
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
24 #include <sys/types.h>
34 #ifdef HAVE_LIBSELINUX
35 #include <selinux/selinux.h>
36 #include <selinux/context.h>
39 #if USE_ACL && defined HAVE_ACL_SET_FILE
46 #include "composite.h"
47 #include "character.h"
51 #include "blockinput.h"
52 #include "region-cache.h"
55 #ifdef HAVE_LINUX_FS_H
56 # include <sys/ioctl.h>
57 # include <linux/fs.h>
65 #endif /* not WINDOWSNT */
69 #include <sys/param.h>
73 /* On Windows, drive letters must be alphabetic - on DOS, the Netware
74 redirector allows the six letters between 'Z' and 'a' as well. */
76 #define IS_DRIVE(x) ((x) >= 'A' && (x) <= 'z')
79 #define IS_DRIVE(x) c_isalpha (x)
81 /* Need to lower-case the drive letter, or else expanded
82 filenames will sometimes compare unequal, because
83 `expand-file-name' doesn't always down-case the drive letter. */
84 #define DRIVE_LETTER(x) c_tolower (x)
89 #include <allocator.h>
90 #include <careadlinkat.h>
91 #include <stat-time.h>
93 #include <binary-io.h>
101 /* True during writing of auto-save files. */
102 static bool auto_saving
;
104 /* Emacs's real umask. */
105 static mode_t realmask
;
107 /* Nonzero umask during creation of auto-save directories. */
108 static mode_t auto_saving_dir_umask
;
110 /* Set by auto_save_1 to mode of original file so Fwrite_region will create
111 a new file with the same mode as the original. */
112 static mode_t auto_save_mode_bits
;
114 /* Set by auto_save_1 if an error occurred during the last auto-save. */
115 static bool auto_save_error_occurred
;
117 /* If VALID_TIMESTAMP_FILE_SYSTEM, then TIMESTAMP_FILE_SYSTEM is the device
118 number of a file system where time stamps were observed to to work. */
119 static bool valid_timestamp_file_system
;
120 static dev_t timestamp_file_system
;
122 /* Each time an annotation function changes the buffer, the new buffer
124 static Lisp_Object Vwrite_region_annotation_buffers
;
126 static bool a_write (int, Lisp_Object
, ptrdiff_t, ptrdiff_t,
127 Lisp_Object
*, struct coding_system
*);
128 static bool e_write (int, Lisp_Object
, ptrdiff_t, ptrdiff_t,
129 struct coding_system
*);
132 /* Return true if FILENAME exists. */
135 check_existing (const char *filename
)
137 return faccessat (AT_FDCWD
, filename
, F_OK
, AT_EACCESS
) == 0;
140 /* Return true if file FILENAME exists and can be executed. */
143 check_executable (char *filename
)
145 return faccessat (AT_FDCWD
, filename
, X_OK
, AT_EACCESS
) == 0;
148 /* Return true if file FILENAME exists and can be accessed
149 according to AMODE, which should include W_OK.
150 On failure, return false and set errno. */
153 check_writable (const char *filename
, int amode
)
156 /* FIXME: an faccessat implementation should be added to the
157 DOS/Windows ports and this #ifdef branch should be removed. */
159 if (stat (filename
, &st
) < 0)
162 return (st
.st_mode
& S_IWRITE
|| S_ISDIR (st
.st_mode
));
163 #else /* not MSDOS */
164 bool res
= faccessat (AT_FDCWD
, filename
, amode
, AT_EACCESS
) == 0;
166 /* faccessat may have returned failure because Cygwin couldn't
167 determine the file's UID or GID; if so, we return success. */
170 int faccessat_errno
= errno
;
172 if (stat (filename
, &st
) < 0)
174 res
= (st
.st_uid
== -1 || st
.st_gid
== -1);
175 errno
= faccessat_errno
;
179 #endif /* not MSDOS */
182 /* Signal a file-access failure. STRING describes the failure,
183 NAME the file involved, and ERRORNO the errno value.
185 If NAME is neither null nor a pair, package it up as a singleton
186 list before reporting it; this saves report_file_errno's caller the
187 trouble of preserving errno before calling list1. */
190 report_file_errno (char const *string
, Lisp_Object name
, int errorno
)
192 Lisp_Object data
= CONSP (name
) || NILP (name
) ? name
: list1 (name
);
193 char *str
= emacs_strerror (errorno
);
194 AUTO_STRING (unibyte_str
, str
);
195 Lisp_Object errstring
196 = code_convert_string_norecord (unibyte_str
, Vlocale_coding_system
, 0);
197 Lisp_Object errdata
= Fcons (errstring
, data
);
199 if (errorno
== EEXIST
)
200 xsignal (Qfile_already_exists
, errdata
);
202 xsignal (Qfile_error
, Fcons (build_string (string
), errdata
));
205 /* Signal a file-access failure that set errno. STRING describes the
206 failure, NAME the file involved. When invoking this function, take
207 care to not use arguments such as build_string ("foo") that involve
208 side effects that may set errno. */
211 report_file_error (char const *string
, Lisp_Object name
)
213 report_file_errno (string
, name
, errno
);
216 /* Like report_file_error, but reports a file-notify-error instead. */
219 report_file_notify_error (const char *string
, Lisp_Object name
)
221 char *str
= emacs_strerror (errno
);
222 AUTO_STRING (unibyte_str
, str
);
223 Lisp_Object errstring
224 = code_convert_string_norecord (unibyte_str
, Vlocale_coding_system
, 0);
225 Lisp_Object data
= CONSP (name
) || NILP (name
) ? name
: list1 (name
);
226 Lisp_Object errdata
= Fcons (errstring
, data
);
228 xsignal (Qfile_notify_error
, Fcons (build_string (string
), errdata
));
232 close_file_unwind (int fd
)
238 fclose_unwind (void *arg
)
244 /* Restore point, having saved it as a marker. */
247 restore_point_unwind (Lisp_Object location
)
249 Fgoto_char (location
);
250 unchain_marker (XMARKER (location
));
254 DEFUN ("find-file-name-handler", Ffind_file_name_handler
,
255 Sfind_file_name_handler
, 2, 2, 0,
256 doc
: /* Return FILENAME's handler function for OPERATION, if it has one.
257 Otherwise, return nil.
258 A file name is handled if one of the regular expressions in
259 `file-name-handler-alist' matches it.
261 If OPERATION equals `inhibit-file-name-operation', then we ignore
262 any handlers that are members of `inhibit-file-name-handlers',
263 but we still do run any other handlers. This lets handlers
264 use the standard functions without calling themselves recursively. */)
265 (Lisp_Object filename
, Lisp_Object operation
)
267 /* This function must not munge the match data. */
268 Lisp_Object chain
, inhibited_handlers
, result
;
272 CHECK_STRING (filename
);
274 if (EQ (operation
, Vinhibit_file_name_operation
))
275 inhibited_handlers
= Vinhibit_file_name_handlers
;
277 inhibited_handlers
= Qnil
;
279 for (chain
= Vfile_name_handler_alist
; CONSP (chain
);
280 chain
= XCDR (chain
))
286 Lisp_Object string
= XCAR (elt
);
288 Lisp_Object handler
= XCDR (elt
);
289 Lisp_Object operations
= Qnil
;
291 if (SYMBOLP (handler
))
292 operations
= Fget (handler
, Qoperations
);
295 && (match_pos
= fast_string_match (string
, filename
)) > pos
296 && (NILP (operations
) || ! NILP (Fmemq (operation
, operations
))))
300 handler
= XCDR (elt
);
301 tem
= Fmemq (handler
, inhibited_handlers
);
315 DEFUN ("file-name-directory", Ffile_name_directory
, Sfile_name_directory
,
317 doc
: /* Return the directory component in file name FILENAME.
318 Return nil if FILENAME does not include a directory.
319 Otherwise return a directory name.
320 Given a Unix syntax file name, returns a string ending in slash. */)
321 (Lisp_Object filename
)
325 CHECK_STRING (filename
);
327 /* If the file name has special constructs in it,
328 call the corresponding file handler. */
329 handler
= Ffind_file_name_handler (filename
, Qfile_name_directory
);
332 Lisp_Object handled_name
= call2 (handler
, Qfile_name_directory
,
334 return STRINGP (handled_name
) ? handled_name
: Qnil
;
337 char *beg
= SSDATA (filename
);
338 char const *p
= beg
+ SBYTES (filename
);
340 while (p
!= beg
&& !IS_DIRECTORY_SEP (p
[-1])
342 /* only recognize drive specifier at the beginning */
344 /* handle the "/:d:foo" and "/:foo" cases correctly */
345 && ((p
== beg
+ 2 && !IS_DIRECTORY_SEP (*beg
))
346 || (p
== beg
+ 4 && IS_DIRECTORY_SEP (*beg
))))
353 /* Expansion of "c:" to drive and default directory. */
356 SAFE_ALLOCA_STRING (beg
, filename
);
357 p
= beg
+ (p
- SSDATA (filename
));
361 /* MAXPATHLEN+1 is guaranteed to be enough space for getdefdir. */
362 char *res
= alloca (MAXPATHLEN
+ 1);
365 if (p
== beg
+ 4 && IS_DIRECTORY_SEP (*beg
) && beg
[1] == ':')
367 memcpy (res
, beg
, 2);
372 if (getdefdir (c_toupper (*beg
) - 'A' + 1, r
))
374 size_t l
= strlen (res
);
376 if (l
> 3 || !IS_DIRECTORY_SEP (res
[l
- 1]))
379 p
= beg
+ strlen (beg
);
380 dostounix_filename (beg
);
381 tem_fn
= make_specified_string (beg
, -1, p
- beg
,
382 STRING_MULTIBYTE (filename
));
385 tem_fn
= make_specified_string (beg
- 2, -1, p
- beg
+ 2,
386 STRING_MULTIBYTE (filename
));
388 else if (STRING_MULTIBYTE (filename
))
390 tem_fn
= make_specified_string (beg
, -1, p
- beg
, 1);
391 dostounix_filename (SSDATA (tem_fn
));
393 if (!NILP (Vw32_downcase_file_names
))
394 tem_fn
= Fdowncase (tem_fn
);
399 dostounix_filename (beg
);
400 tem_fn
= make_specified_string (beg
, -1, p
- beg
, 0);
405 return make_specified_string (beg
, -1, p
- beg
, STRING_MULTIBYTE (filename
));
409 DEFUN ("file-name-nondirectory", Ffile_name_nondirectory
,
410 Sfile_name_nondirectory
, 1, 1, 0,
411 doc
: /* Return file name FILENAME sans its directory.
412 For example, in a Unix-syntax file name,
413 this is everything after the last slash,
414 or the entire name if it contains no slash. */)
415 (Lisp_Object filename
)
417 register const char *beg
, *p
, *end
;
420 CHECK_STRING (filename
);
422 /* If the file name has special constructs in it,
423 call the corresponding file handler. */
424 handler
= Ffind_file_name_handler (filename
, Qfile_name_nondirectory
);
427 Lisp_Object handled_name
= call2 (handler
, Qfile_name_nondirectory
,
429 if (STRINGP (handled_name
))
431 error ("Invalid handler in `file-name-handler-alist'");
434 beg
= SSDATA (filename
);
435 end
= p
= beg
+ SBYTES (filename
);
437 while (p
!= beg
&& !IS_DIRECTORY_SEP (p
[-1])
439 /* only recognize drive specifier at beginning */
441 /* handle the "/:d:foo" case correctly */
442 && (p
== beg
+ 2 || (p
== beg
+ 4 && IS_DIRECTORY_SEP (*beg
))))
447 return make_specified_string (p
, -1, end
- p
, STRING_MULTIBYTE (filename
));
450 DEFUN ("unhandled-file-name-directory", Funhandled_file_name_directory
,
451 Sunhandled_file_name_directory
, 1, 1, 0,
452 doc
: /* Return a directly usable directory name somehow associated with FILENAME.
453 A `directly usable' directory name is one that may be used without the
454 intervention of any file handler.
455 If FILENAME is a directly usable file itself, return
456 \(file-name-as-directory FILENAME).
457 If FILENAME refers to a file which is not accessible from a local process,
458 then this should return nil.
459 The `call-process' and `start-process' functions use this function to
460 get a current directory to run processes in. */)
461 (Lisp_Object filename
)
465 /* If the file name has special constructs in it,
466 call the corresponding file handler. */
467 handler
= Ffind_file_name_handler (filename
, Qunhandled_file_name_directory
);
470 Lisp_Object handled_name
= call2 (handler
, Qunhandled_file_name_directory
,
472 return STRINGP (handled_name
) ? handled_name
: Qnil
;
475 return Ffile_name_as_directory (filename
);
478 /* Maximum number of bytes that DST will be longer than SRC
479 in file_name_as_directory. This occurs when SRCLEN == 0. */
480 enum { file_name_as_directory_slop
= 2 };
482 /* Convert from file name SRC of length SRCLEN to directory name in
483 DST. MULTIBYTE non-zero means the file name in SRC is a multibyte
484 string. On UNIX, just make sure there is a terminating /. Return
485 the length of DST in bytes. */
488 file_name_as_directory (char *dst
, const char *src
, ptrdiff_t srclen
,
499 memcpy (dst
, src
, srclen
);
500 if (!IS_DIRECTORY_SEP (dst
[srclen
- 1]))
501 dst
[srclen
++] = DIRECTORY_SEP
;
504 dostounix_filename (dst
);
509 DEFUN ("file-name-as-directory", Ffile_name_as_directory
,
510 Sfile_name_as_directory
, 1, 1, 0,
511 doc
: /* Return a string representing the file name FILE interpreted as a directory.
512 This operation exists because a directory is also a file, but its name as
513 a directory is different from its name as a file.
514 The result can be used as the value of `default-directory'
515 or passed as second argument to `expand-file-name'.
516 For a Unix-syntax file name, just appends a slash unless a trailing slash
517 is already present. */)
522 Lisp_Object handler
, val
;
527 /* If the file name has special constructs in it,
528 call the corresponding file handler. */
529 handler
= Ffind_file_name_handler (file
, Qfile_name_as_directory
);
532 Lisp_Object handled_name
= call2 (handler
, Qfile_name_as_directory
,
534 if (STRINGP (handled_name
))
536 error ("Invalid handler in `file-name-handler-alist'");
540 if (!NILP (Vw32_downcase_file_names
))
541 file
= Fdowncase (file
);
543 buf
= SAFE_ALLOCA (SBYTES (file
) + file_name_as_directory_slop
+ 1);
544 length
= file_name_as_directory (buf
, SSDATA (file
), SBYTES (file
),
545 STRING_MULTIBYTE (file
));
546 val
= make_specified_string (buf
, -1, length
, STRING_MULTIBYTE (file
));
551 /* Convert from directory name SRC of length SRCLEN to file name in
552 DST. MULTIBYTE non-zero means the file name in SRC is a multibyte
553 string. On UNIX, just make sure there isn't a terminating /.
554 Return the length of DST in bytes. */
557 directory_file_name (char *dst
, char *src
, ptrdiff_t srclen
, bool multibyte
)
559 /* Process as Unix format: just remove any final slash.
560 But leave "/" and "//" unchanged. */
563 && !IS_ANY_SEP (src
[srclen
- 2])
565 && IS_DIRECTORY_SEP (src
[srclen
- 1])
566 && ! (srclen
== 2 && IS_DIRECTORY_SEP (src
[0])))
569 memcpy (dst
, src
, srclen
);
572 dostounix_filename (dst
);
577 DEFUN ("directory-file-name", Fdirectory_file_name
, Sdirectory_file_name
,
579 doc
: /* Returns the file name of the directory named DIRECTORY.
580 This is the name of the file that holds the data for the directory DIRECTORY.
581 This operation exists because a directory is also a file, but its name as
582 a directory is different from its name as a file.
583 In Unix-syntax, this function just removes the final slash. */)
584 (Lisp_Object directory
)
588 Lisp_Object handler
, val
;
591 CHECK_STRING (directory
);
593 /* If the file name has special constructs in it,
594 call the corresponding file handler. */
595 handler
= Ffind_file_name_handler (directory
, Qdirectory_file_name
);
598 Lisp_Object handled_name
= call2 (handler
, Qdirectory_file_name
,
600 if (STRINGP (handled_name
))
602 error ("Invalid handler in `file-name-handler-alist'");
606 if (!NILP (Vw32_downcase_file_names
))
607 directory
= Fdowncase (directory
);
609 buf
= SAFE_ALLOCA (SBYTES (directory
) + 1);
610 length
= directory_file_name (buf
, SSDATA (directory
), SBYTES (directory
),
611 STRING_MULTIBYTE (directory
));
612 val
= make_specified_string (buf
, -1, length
, STRING_MULTIBYTE (directory
));
617 static const char make_temp_name_tbl
[64] =
619 'A','B','C','D','E','F','G','H',
620 'I','J','K','L','M','N','O','P',
621 'Q','R','S','T','U','V','W','X',
622 'Y','Z','a','b','c','d','e','f',
623 'g','h','i','j','k','l','m','n',
624 'o','p','q','r','s','t','u','v',
625 'w','x','y','z','0','1','2','3',
626 '4','5','6','7','8','9','-','_'
629 static unsigned make_temp_name_count
, make_temp_name_count_initialized_p
;
631 /* Value is a temporary file name starting with PREFIX, a string.
633 The Emacs process number forms part of the result, so there is
634 no danger of generating a name being used by another process.
635 In addition, this function makes an attempt to choose a name
636 which has no existing file. To make this work, PREFIX should be
637 an absolute file name.
639 BASE64_P means add the pid as 3 characters in base64
640 encoding. In this case, 6 characters will be added to PREFIX to
641 form the file name. Otherwise, if Emacs is running on a system
642 with long file names, add the pid as a decimal number.
644 This function signals an error if no unique file name could be
648 make_temp_name (Lisp_Object prefix
, bool base64_p
)
650 Lisp_Object val
, encoded_prefix
;
654 char pidbuf
[INT_BUFSIZE_BOUND (printmax_t
)];
657 CHECK_STRING (prefix
);
659 /* VAL is created by adding 6 characters to PREFIX. The first
660 three are the PID of this process, in base 64, and the second
661 three are incremented if the file already exists. This ensures
662 262144 unique file names per PID per PREFIX. */
668 pidbuf
[0] = make_temp_name_tbl
[pid
& 63], pid
>>= 6;
669 pidbuf
[1] = make_temp_name_tbl
[pid
& 63], pid
>>= 6;
670 pidbuf
[2] = make_temp_name_tbl
[pid
& 63], pid
>>= 6;
675 #ifdef HAVE_LONG_FILE_NAMES
676 pidlen
= sprintf (pidbuf
, "%"pMd
, pid
);
678 pidbuf
[0] = make_temp_name_tbl
[pid
& 63], pid
>>= 6;
679 pidbuf
[1] = make_temp_name_tbl
[pid
& 63], pid
>>= 6;
680 pidbuf
[2] = make_temp_name_tbl
[pid
& 63], pid
>>= 6;
685 encoded_prefix
= ENCODE_FILE (prefix
);
686 len
= SBYTES (encoded_prefix
);
687 val
= make_uninit_string (len
+ 3 + pidlen
);
689 memcpy (data
, SSDATA (encoded_prefix
), len
);
692 memcpy (p
, pidbuf
, pidlen
);
695 /* Here we try to minimize useless stat'ing when this function is
696 invoked many times successively with the same PREFIX. We achieve
697 this by initializing count to a random value, and incrementing it
700 We don't want make-temp-name to be called while dumping,
701 because then make_temp_name_count_initialized_p would get set
702 and then make_temp_name_count would not be set when Emacs starts. */
704 if (!make_temp_name_count_initialized_p
)
706 make_temp_name_count
= time (NULL
);
707 make_temp_name_count_initialized_p
= 1;
712 unsigned num
= make_temp_name_count
;
714 p
[0] = make_temp_name_tbl
[num
& 63], num
>>= 6;
715 p
[1] = make_temp_name_tbl
[num
& 63], num
>>= 6;
716 p
[2] = make_temp_name_tbl
[num
& 63], num
>>= 6;
718 /* Poor man's congruential RN generator. Replace with
719 ++make_temp_name_count for debugging. */
720 make_temp_name_count
+= 25229;
721 make_temp_name_count
%= 225307;
723 if (!check_existing (data
))
725 /* We want to return only if errno is ENOENT. */
727 return DECODE_FILE (val
);
729 /* The error here is dubious, but there is little else we
730 can do. The alternatives are to return nil, which is
731 as bad as (and in many cases worse than) throwing the
732 error, or to ignore the error, which will likely result
733 in looping through 225307 stat's, which is not only
734 dog-slow, but also useless since eventually nil would
735 have to be returned anyway. */
736 report_file_error ("Cannot create temporary name for prefix",
744 DEFUN ("make-temp-name", Fmake_temp_name
, Smake_temp_name
, 1, 1, 0,
745 doc
: /* Generate temporary file name (string) starting with PREFIX (a string).
746 The Emacs process number forms part of the result, so there is no
747 danger of generating a name being used by another Emacs process
748 \(so long as only a single host can access the containing directory...).
750 This function tries to choose a name that has no existing file.
751 For this to work, PREFIX should be an absolute file name.
753 There is a race condition between calling `make-temp-name' and creating the
754 file, which opens all kinds of security holes. For that reason, you should
755 normally use `make-temp-file' instead. */)
758 return make_temp_name (prefix
, 0);
761 DEFUN ("expand-file-name", Fexpand_file_name
, Sexpand_file_name
, 1, 2, 0,
762 doc
: /* Convert filename NAME to absolute, and canonicalize it.
763 Second arg DEFAULT-DIRECTORY is directory to start with if NAME is relative
764 \(does not start with slash or tilde); both the directory name and
765 a directory's file name are accepted. If DEFAULT-DIRECTORY is nil or
766 missing, the current buffer's value of `default-directory' is used.
767 NAME should be a string that is a valid file name for the underlying
769 File name components that are `.' are removed, and
770 so are file name components followed by `..', along with the `..' itself;
771 note that these simplifications are done without checking the resulting
772 file names in the file system.
773 Multiple consecutive slashes are collapsed into a single slash,
774 except at the beginning of the file name when they are significant (e.g.,
775 UNC file names on MS-Windows.)
776 An initial `~/' expands to your home directory.
777 An initial `~USER/' expands to USER's home directory.
778 See also the function `substitute-in-file-name'.
780 For technical reasons, this function can return correct but
781 non-intuitive results for the root directory; for instance,
782 \(expand-file-name ".." "/") returns "/..". For this reason, use
783 \(directory-file-name (file-name-directory dirname)) to traverse a
784 filesystem tree, not (expand-file-name ".." dirname). */)
785 (Lisp_Object name
, Lisp_Object default_directory
)
787 /* These point to SDATA and need to be careful with string-relocation
788 during GC (via DECODE_FILE). */
792 const char *newdirlim
;
793 /* This should only point to alloca'd data. */
800 bool collapse_newdir
= true;
803 ptrdiff_t length
, nbytes
;
804 Lisp_Object handler
, result
, handled_name
;
811 /* If the file name has special constructs in it,
812 call the corresponding file handler. */
813 handler
= Ffind_file_name_handler (name
, Qexpand_file_name
);
816 handled_name
= call3 (handler
, Qexpand_file_name
,
817 name
, default_directory
);
818 if (STRINGP (handled_name
))
820 error ("Invalid handler in `file-name-handler-alist'");
824 /* Use the buffer's default-directory if DEFAULT_DIRECTORY is omitted. */
825 if (NILP (default_directory
))
826 default_directory
= BVAR (current_buffer
, directory
);
827 if (! STRINGP (default_directory
))
830 /* "/" is not considered a root directory on DOS_NT, so using "/"
831 here causes an infinite recursion in, e.g., the following:
833 (let (default-directory)
834 (expand-file-name "a"))
836 To avoid this, we set default_directory to the root of the
838 default_directory
= build_string (emacs_root_dir ());
840 default_directory
= build_string ("/");
844 if (!NILP (default_directory
))
846 handler
= Ffind_file_name_handler (default_directory
, Qexpand_file_name
);
849 handled_name
= call3 (handler
, Qexpand_file_name
,
850 name
, default_directory
);
851 if (STRINGP (handled_name
))
853 error ("Invalid handler in `file-name-handler-alist'");
858 char *o
= SSDATA (default_directory
);
860 /* Make sure DEFAULT_DIRECTORY is properly expanded.
861 It would be better to do this down below where we actually use
862 default_directory. Unfortunately, calling Fexpand_file_name recursively
863 could invoke GC, and the strings might be relocated. This would
864 be annoying because we have pointers into strings lying around
865 that would need adjusting, and people would add new pointers to
866 the code and forget to adjust them, resulting in intermittent bugs.
867 Putting this call here avoids all that crud.
869 The EQ test avoids infinite recursion. */
870 if (! NILP (default_directory
) && !EQ (default_directory
, name
)
871 /* Save time in some common cases - as long as default_directory
872 is not relative, it can be canonicalized with name below (if it
873 is needed at all) without requiring it to be expanded now. */
875 /* Detect MSDOS file names with drive specifiers. */
876 && ! (IS_DRIVE (o
[0]) && IS_DEVICE_SEP (o
[1])
877 && IS_DIRECTORY_SEP (o
[2]))
879 /* Detect Windows file names in UNC format. */
880 && ! (IS_DIRECTORY_SEP (o
[0]) && IS_DIRECTORY_SEP (o
[1]))
882 #else /* not DOS_NT */
883 /* Detect Unix absolute file names (/... alone is not absolute on
885 && ! (IS_DIRECTORY_SEP (o
[0]))
886 #endif /* not DOS_NT */
889 default_directory
= Fexpand_file_name (default_directory
, Qnil
);
892 multibyte
= STRING_MULTIBYTE (name
);
893 if (multibyte
!= STRING_MULTIBYTE (default_directory
))
897 unsigned char *p
= SDATA (name
);
899 while (*p
&& ASCII_CHAR_P (*p
))
903 /* NAME is a pure ASCII string, and DEFAULT_DIRECTORY is
904 unibyte. Do not convert DEFAULT_DIRECTORY to
905 multibyte; instead, convert NAME to a unibyte string,
906 so that the result of this function is also a unibyte
907 string. This is needed during bootstrapping and
908 dumping, when Emacs cannot decode file names, because
909 the locale environment is not set up. */
910 name
= make_unibyte_string (SSDATA (name
), SBYTES (name
));
914 default_directory
= string_to_multibyte (default_directory
);
918 name
= string_to_multibyte (name
);
924 if (!NILP (Vw32_downcase_file_names
))
925 default_directory
= Fdowncase (default_directory
);
928 /* Make a local copy of NAME to protect it from GC in DECODE_FILE below. */
929 SAFE_ALLOCA_STRING (nm
, name
);
930 nmlim
= nm
+ SBYTES (name
);
933 /* Note if special escape prefix is present, but remove for now. */
934 if (nm
[0] == '/' && nm
[1] == ':')
940 /* Find and remove drive specifier if present; this makes nm absolute
941 even if the rest of the name appears to be relative. Only look for
942 drive specifier at the beginning. */
943 if (IS_DRIVE (nm
[0]) && IS_DEVICE_SEP (nm
[1]))
945 drive
= (unsigned char) nm
[0];
950 /* If we see "c://somedir", we want to strip the first slash after the
951 colon when stripping the drive letter. Otherwise, this expands to
953 if (drive
&& IS_DIRECTORY_SEP (nm
[0]) && IS_DIRECTORY_SEP (nm
[1]))
956 /* Discard any previous drive specifier if nm is now in UNC format. */
957 if (IS_DIRECTORY_SEP (nm
[0]) && IS_DIRECTORY_SEP (nm
[1])
958 && !IS_DIRECTORY_SEP (nm
[2]))
960 #endif /* WINDOWSNT */
963 /* If nm is absolute, look for `/./' or `/../' or `//''sequences; if
964 none are found, we can probably return right away. We will avoid
965 allocating a new string if name is already fully expanded. */
967 IS_DIRECTORY_SEP (nm
[0])
969 && drive
&& !is_escaped
972 && (drive
|| IS_DIRECTORY_SEP (nm
[1])) && !is_escaped
976 /* If it turns out that the filename we want to return is just a
977 suffix of FILENAME, we don't need to go through and edit
978 things; we just need to construct a new string using data
979 starting at the middle of FILENAME. If we set LOSE, that
980 means we've discovered that we can't do that cool trick. */
986 /* Since we know the name is absolute, we can assume that each
987 element starts with a "/". */
989 /* "." and ".." are hairy. */
990 if (IS_DIRECTORY_SEP (p
[0])
992 && (IS_DIRECTORY_SEP (p
[2])
994 || (p
[2] == '.' && (IS_DIRECTORY_SEP (p
[3])
997 /* Replace multiple slashes with a single one, except
998 leave leading "//" alone. */
999 else if (IS_DIRECTORY_SEP (p
[0])
1000 && IS_DIRECTORY_SEP (p
[1])
1001 && (p
!= nm
|| IS_DIRECTORY_SEP (p
[2])))
1008 /* Make sure directories are all separated with /, but
1009 avoid allocation of a new string when not required. */
1010 dostounix_filename (nm
);
1012 if (IS_DIRECTORY_SEP (nm
[1]))
1014 if (strcmp (nm
, SSDATA (name
)) != 0)
1015 name
= make_specified_string (nm
, -1, nmlim
- nm
, multibyte
);
1019 /* Drive must be set, so this is okay. */
1020 if (strcmp (nm
- 2, SSDATA (name
)) != 0)
1022 name
= make_specified_string (nm
, -1, p
- nm
, multibyte
);
1023 char temp
[] = { DRIVE_LETTER (drive
), ':', 0 };
1024 AUTO_STRING_WITH_LEN (drive_prefix
, temp
, 2);
1025 name
= concat2 (drive_prefix
, name
);
1028 if (!NILP (Vw32_downcase_file_names
))
1029 name
= Fdowncase (name
);
1031 #else /* not DOS_NT */
1032 if (strcmp (nm
, SSDATA (name
)) != 0)
1033 name
= make_specified_string (nm
, -1, nmlim
- nm
, multibyte
);
1034 #endif /* not DOS_NT */
1040 /* At this point, nm might or might not be an absolute file name. We
1041 need to expand ~ or ~user if present, otherwise prefix nm with
1042 default_directory if nm is not absolute, and finally collapse /./
1043 and /foo/../ sequences.
1045 We set newdir to be the appropriate prefix if one is needed:
1046 - the relevant user directory if nm starts with ~ or ~user
1047 - the specified drive's working dir (DOS/NT only) if nm does not
1049 - the value of default_directory.
1051 Note that these prefixes are not guaranteed to be absolute (except
1052 for the working dir of a drive). Therefore, to ensure we always
1053 return an absolute name, if the final prefix is not absolute we
1054 append it to the current working directory. */
1056 newdir
= newdirlim
= 0;
1058 if (nm
[0] == '~') /* prefix ~ */
1060 if (IS_DIRECTORY_SEP (nm
[1])
1061 || nm
[1] == 0) /* ~ by itself */
1065 if (!(newdir
= egetenv ("HOME")))
1066 newdir
= newdirlim
= "";
1068 /* `egetenv' may return a unibyte string, which will bite us since
1069 we expect the directory to be multibyte. */
1073 char newdir_utf8
[MAX_UTF8_PATH
];
1075 filename_from_ansi (newdir
, newdir_utf8
);
1076 tem
= make_unibyte_string (newdir_utf8
, strlen (newdir_utf8
));
1080 tem
= build_string (newdir
);
1081 newdirlim
= newdir
+ SBYTES (tem
);
1082 if (multibyte
&& !STRING_MULTIBYTE (tem
))
1084 hdir
= DECODE_FILE (tem
);
1085 newdir
= SSDATA (hdir
);
1086 newdirlim
= newdir
+ SBYTES (hdir
);
1089 collapse_newdir
= false;
1092 else /* ~user/filename */
1095 for (p
= nm
; *p
&& !IS_DIRECTORY_SEP (*p
); p
++)
1097 o
= SAFE_ALLOCA (p
- nm
+ 1);
1098 memcpy (o
, nm
, p
- nm
);
1102 pw
= getpwnam (o
+ 1);
1108 newdir
= pw
->pw_dir
;
1109 /* `getpwnam' may return a unibyte string, which will
1110 bite us since we expect the directory to be
1112 tem
= make_unibyte_string (newdir
, strlen (newdir
));
1113 newdirlim
= newdir
+ SBYTES (tem
);
1114 if (multibyte
&& !STRING_MULTIBYTE (tem
))
1116 hdir
= DECODE_FILE (tem
);
1117 newdir
= SSDATA (hdir
);
1118 newdirlim
= newdir
+ SBYTES (hdir
);
1122 collapse_newdir
= false;
1126 /* If we don't find a user of that name, leave the name
1127 unchanged; don't move nm forward to p. */
1132 /* On DOS and Windows, nm is absolute if a drive name was specified;
1133 use the drive's current directory as the prefix if needed. */
1134 if (!newdir
&& drive
)
1136 /* Get default directory if needed to make nm absolute. */
1138 if (!IS_DIRECTORY_SEP (nm
[0]))
1140 adir
= alloca (MAXPATHLEN
+ 1);
1141 if (!getdefdir (c_toupper (drive
) - 'A' + 1, adir
))
1145 Lisp_Object tem
= build_string (adir
);
1147 tem
= DECODE_FILE (tem
);
1148 newdirlim
= adir
+ SBYTES (tem
);
1149 memcpy (adir
, SSDATA (tem
), SBYTES (tem
) + 1);
1152 newdirlim
= adir
+ strlen (adir
);
1156 /* Either nm starts with /, or drive isn't mounted. */
1158 adir
[0] = DRIVE_LETTER (drive
);
1162 newdirlim
= adir
+ 3;
1168 /* Finally, if no prefix has been specified and nm is not absolute,
1169 then it must be expanded relative to default_directory. */
1173 /* /... alone is not absolute on DOS and Windows. */
1174 && !IS_DIRECTORY_SEP (nm
[0])
1177 && !(IS_DIRECTORY_SEP (nm
[0]) && IS_DIRECTORY_SEP (nm
[1])
1178 && !IS_DIRECTORY_SEP (nm
[2]))
1182 newdir
= SSDATA (default_directory
);
1183 newdirlim
= newdir
+ SBYTES (default_directory
);
1185 /* Note if special escape prefix is present, but remove for now. */
1186 if (newdir
[0] == '/' && newdir
[1] == ':')
1197 /* First ensure newdir is an absolute name. */
1199 /* Detect MSDOS file names with drive specifiers. */
1200 ! (IS_DRIVE (newdir
[0])
1201 && IS_DEVICE_SEP (newdir
[1]) && IS_DIRECTORY_SEP (newdir
[2]))
1203 /* Detect Windows file names in UNC format. */
1204 && ! (IS_DIRECTORY_SEP (newdir
[0]) && IS_DIRECTORY_SEP (newdir
[1])
1205 && !IS_DIRECTORY_SEP (newdir
[2]))
1209 /* Effectively, let newdir be (expand-file-name newdir cwd).
1210 Because of the admonition against calling expand-file-name
1211 when we have pointers into lisp strings, we accomplish this
1212 indirectly by prepending newdir to nm if necessary, and using
1213 cwd (or the wd of newdir's drive) as the new newdir. */
1216 const int adir_size
= MAX_UTF8_PATH
;
1218 const int adir_size
= MAXPATHLEN
+ 1;
1221 if (IS_DRIVE (newdir
[0]) && IS_DEVICE_SEP (newdir
[1]))
1223 drive
= (unsigned char) newdir
[0];
1226 if (!IS_DIRECTORY_SEP (nm
[0]))
1228 ptrdiff_t nmlen
= nmlim
- nm
;
1229 ptrdiff_t newdirlen
= newdirlim
- newdir
;
1230 char *tmp
= alloca (newdirlen
+ file_name_as_directory_slop
1232 ptrdiff_t dlen
= file_name_as_directory (tmp
, newdir
, newdirlen
,
1234 memcpy (tmp
+ dlen
, nm
, nmlen
+ 1);
1236 nmlim
= nm
+ dlen
+ nmlen
;
1238 adir
= alloca (adir_size
);
1241 if (!getdefdir (c_toupper (drive
) - 'A' + 1, adir
))
1245 getcwd (adir
, adir_size
);
1248 Lisp_Object tem
= build_string (adir
);
1250 tem
= DECODE_FILE (tem
);
1251 newdirlim
= adir
+ SBYTES (tem
);
1252 memcpy (adir
, SSDATA (tem
), SBYTES (tem
) + 1);
1255 newdirlim
= adir
+ strlen (adir
);
1259 /* Strip off drive name from prefix, if present. */
1260 if (IS_DRIVE (newdir
[0]) && IS_DEVICE_SEP (newdir
[1]))
1266 /* Keep only a prefix from newdir if nm starts with slash
1267 (//server/share for UNC, nothing otherwise). */
1268 if (IS_DIRECTORY_SEP (nm
[0]) && collapse_newdir
)
1271 if (IS_DIRECTORY_SEP (newdir
[0]) && IS_DIRECTORY_SEP (newdir
[1])
1272 && !IS_DIRECTORY_SEP (newdir
[2]))
1274 char *adir
= strcpy (alloca (newdirlim
- newdir
+ 1), newdir
);
1276 while (*p
&& !IS_DIRECTORY_SEP (*p
)) p
++;
1278 while (*p
&& !IS_DIRECTORY_SEP (*p
)) p
++;
1281 newdirlim
= newdir
+ strlen (adir
);
1285 newdir
= newdirlim
= "";
1290 /* Ignore any slash at the end of newdir, unless newdir is
1291 just "/" or "//". */
1292 length
= newdirlim
- newdir
;
1293 while (length
> 1 && IS_DIRECTORY_SEP (newdir
[length
- 1])
1294 && ! (length
== 2 && IS_DIRECTORY_SEP (newdir
[0])))
1297 /* Now concatenate the directory and name to new space in the stack frame. */
1298 tlen
= length
+ file_name_as_directory_slop
+ (nmlim
- nm
) + 1;
1299 eassert (tlen
> file_name_as_directory_slop
+ 1);
1301 /* Reserve space for drive specifier and escape prefix, since either
1302 or both may need to be inserted. (The Microsoft x86 compiler
1303 produces incorrect code if the following two lines are combined.) */
1304 target
= alloca (tlen
+ 4);
1306 #else /* not DOS_NT */
1307 target
= SAFE_ALLOCA (tlen
);
1308 #endif /* not DOS_NT */
1314 if (nm
[0] == 0 || IS_DIRECTORY_SEP (nm
[0]))
1317 /* If newdir is effectively "C:/", then the drive letter will have
1318 been stripped and newdir will be "/". Concatenating with an
1319 absolute directory in nm produces "//", which will then be
1320 incorrectly treated as a network share. Ignore newdir in
1321 this case (keeping the drive letter). */
1322 if (!(drive
&& nm
[0] && IS_DIRECTORY_SEP (newdir
[0])
1323 && newdir
[1] == '\0'))
1326 memcpy (target
, newdir
, length
);
1332 nbytes
= file_name_as_directory (target
, newdir
, length
, multibyte
);
1335 memcpy (target
+ nbytes
, nm
, nmlim
- nm
+ 1);
1337 /* Now canonicalize by removing `//', `/.' and `/foo/..' if they
1345 if (!IS_DIRECTORY_SEP (*p
))
1349 else if (p
[1] == '.'
1350 && (IS_DIRECTORY_SEP (p
[2])
1353 /* If "/." is the entire filename, keep the "/". Otherwise,
1354 just delete the whole "/.". */
1355 if (o
== target
&& p
[2] == '\0')
1359 else if (p
[1] == '.' && p
[2] == '.'
1360 /* `/../' is the "superroot" on certain file systems.
1361 Turned off on DOS_NT systems because they have no
1362 "superroot" and because this causes us to produce
1363 file names like "d:/../foo" which fail file-related
1364 functions of the underlying OS. (To reproduce, try a
1365 long series of "../../" in default_directory, longer
1366 than the number of levels from the root.) */
1370 && (IS_DIRECTORY_SEP (p
[3]) || p
[3] == 0))
1375 while (o
!= target
&& (--o
, !IS_DIRECTORY_SEP (*o
)))
1378 /* Don't go below server level in UNC filenames. */
1379 if (o
== target
+ 1 && IS_DIRECTORY_SEP (*o
)
1380 && IS_DIRECTORY_SEP (*target
))
1384 /* Keep initial / only if this is the whole name. */
1385 if (o
== target
&& IS_ANY_SEP (*o
) && p
[3] == 0)
1389 else if (IS_DIRECTORY_SEP (p
[1])
1390 && (p
!= target
|| IS_DIRECTORY_SEP (p
[2])))
1391 /* Collapse multiple "/", except leave leading "//" alone. */
1400 /* At last, set drive name. */
1402 /* Except for network file name. */
1403 if (!(IS_DIRECTORY_SEP (target
[0]) && IS_DIRECTORY_SEP (target
[1])))
1404 #endif /* WINDOWSNT */
1406 if (!drive
) emacs_abort ();
1408 target
[0] = DRIVE_LETTER (drive
);
1411 /* Reinsert the escape prefix if required. */
1418 result
= make_specified_string (target
, -1, o
- target
, multibyte
);
1419 dostounix_filename (SSDATA (result
));
1421 if (!NILP (Vw32_downcase_file_names
))
1422 result
= Fdowncase (result
);
1425 result
= make_specified_string (target
, -1, o
- target
, multibyte
);
1426 #endif /* !DOS_NT */
1429 /* Again look to see if the file name has special constructs in it
1430 and perhaps call the corresponding file handler. This is needed
1431 for filenames such as "/foo/../user@host:/bar/../baz". Expanding
1432 the ".." component gives us "/user@host:/bar/../baz" which needs
1433 to be expanded again. */
1434 handler
= Ffind_file_name_handler (result
, Qexpand_file_name
);
1435 if (!NILP (handler
))
1437 handled_name
= call3 (handler
, Qexpand_file_name
,
1438 result
, default_directory
);
1439 if (! STRINGP (handled_name
))
1440 error ("Invalid handler in `file-name-handler-alist'");
1441 result
= handled_name
;
1449 /* PLEASE DO NOT DELETE THIS COMMENTED-OUT VERSION!
1450 This is the old version of expand-file-name, before it was thoroughly
1451 rewritten for Emacs 10.31. We leave this version here commented-out,
1452 because the code is very complex and likely to have subtle bugs. If
1453 bugs _are_ found, it might be of interest to look at the old code and
1454 see what did it do in the relevant situation.
1456 Don't remove this code: it's true that it will be accessible
1457 from the repository, but a few years from deletion, people will
1458 forget it is there. */
1460 /* Changed this DEFUN to a DEAFUN, so as not to confuse `make-docfile'. */
1461 DEAFUN ("expand-file-name", Fexpand_file_name
, Sexpand_file_name
, 1, 2, 0,
1462 "Convert FILENAME to absolute, and canonicalize it.\n\
1463 Second arg DEFAULT is directory to start with if FILENAME is relative\n\
1464 \(does not start with slash); if DEFAULT is nil or missing,\n\
1465 the current buffer's value of default-directory is used.\n\
1466 Filenames containing `.' or `..' as components are simplified;\n\
1467 initial `~/' expands to your home directory.\n\
1468 See also the function `substitute-in-file-name'.")
1470 Lisp_Object name
, defalt
;
1474 register unsigned char *newdir
, *p
, *o
;
1476 unsigned char *target
;
1479 CHECK_STRING (name
);
1482 /* If nm is absolute, flush ...// and detect /./ and /../.
1483 If no /./ or /../ we can return right away. */
1490 if (p
[0] == '/' && p
[1] == '/')
1492 if (p
[0] == '/' && p
[1] == '~')
1493 nm
= p
+ 1, lose
= 1;
1494 if (p
[0] == '/' && p
[1] == '.'
1495 && (p
[2] == '/' || p
[2] == 0
1496 || (p
[2] == '.' && (p
[3] == '/' || p
[3] == 0))))
1502 if (nm
== SDATA (name
))
1504 return build_string (nm
);
1508 /* Now determine directory to start with and put it in NEWDIR. */
1512 if (nm
[0] == '~') /* prefix ~ */
1513 if (nm
[1] == '/' || nm
[1] == 0)/* ~/filename */
1515 if (!(newdir
= (unsigned char *) egetenv ("HOME")))
1516 newdir
= (unsigned char *) "";
1519 else /* ~user/filename */
1521 /* Get past ~ to user. */
1522 unsigned char *user
= nm
+ 1;
1523 /* Find end of name. */
1524 unsigned char *ptr
= (unsigned char *) strchr (user
, '/');
1525 ptrdiff_t len
= ptr
? ptr
- user
: strlen (user
);
1526 /* Copy the user name into temp storage. */
1527 o
= alloca (len
+ 1);
1528 memcpy (o
, user
, len
);
1531 /* Look up the user name. */
1533 pw
= (struct passwd
*) getpwnam (o
+ 1);
1536 error ("\"%s\" isn't a registered user", o
+ 1);
1538 newdir
= (unsigned char *) pw
->pw_dir
;
1540 /* Discard the user name from NM. */
1544 if (nm
[0] != '/' && !newdir
)
1547 defalt
= current_buffer
->directory
;
1548 CHECK_STRING (defalt
);
1549 newdir
= SDATA (defalt
);
1552 /* Now concatenate the directory and name to new space in the stack frame. */
1554 tlen
= (newdir
? strlen (newdir
) + 1 : 0) + strlen (nm
) + 1;
1555 target
= alloca (tlen
);
1560 if (nm
[0] == 0 || nm
[0] == '/')
1561 strcpy (target
, newdir
);
1563 file_name_as_directory (target
, newdir
);
1566 strcat (target
, nm
);
1568 /* Now canonicalize by removing /. and /foo/.. if they appear. */
1579 else if (!strncmp (p
, "//", 2)
1585 else if (p
[0] == '/' && p
[1] == '.'
1586 && (p
[2] == '/' || p
[2] == 0))
1588 else if (!strncmp (p
, "/..", 3)
1589 /* `/../' is the "superroot" on certain file systems. */
1591 && (p
[3] == '/' || p
[3] == 0))
1593 while (o
!= target
&& *--o
!= '/')
1595 if (o
== target
&& *o
== '/')
1605 return make_string (target
, o
- target
);
1609 /* If /~ or // appears, discard everything through first slash. */
1611 file_name_absolute_p (const char *filename
)
1614 (IS_DIRECTORY_SEP (*filename
) || *filename
== '~'
1616 || (IS_DRIVE (*filename
) && IS_DEVICE_SEP (filename
[1])
1617 && IS_DIRECTORY_SEP (filename
[2]))
1623 search_embedded_absfilename (char *nm
, char *endp
)
1627 for (p
= nm
+ 1; p
< endp
; p
++)
1629 if (IS_DIRECTORY_SEP (p
[-1])
1630 && file_name_absolute_p (p
)
1631 #if defined (WINDOWSNT) || defined (CYGWIN)
1632 /* // at start of file name is meaningful in Apollo,
1633 WindowsNT and Cygwin systems. */
1634 && !(IS_DIRECTORY_SEP (p
[0]) && p
- 1 == nm
)
1635 #endif /* not (WINDOWSNT || CYGWIN) */
1638 for (s
= p
; *s
&& !IS_DIRECTORY_SEP (*s
); s
++);
1639 if (p
[0] == '~' && s
> p
+ 1) /* We've got "/~something/". */
1642 char *o
= SAFE_ALLOCA (s
- p
+ 1);
1644 memcpy (o
, p
, s
- p
);
1647 /* If we have ~user and `user' exists, discard
1648 everything up to ~. But if `user' does not exist, leave
1649 ~user alone, it might be a literal file name. */
1651 pw
= getpwnam (o
+ 1);
1664 DEFUN ("substitute-in-file-name", Fsubstitute_in_file_name
,
1665 Ssubstitute_in_file_name
, 1, 1, 0,
1666 doc
: /* Substitute environment variables referred to in FILENAME.
1667 `$FOO' where FOO is an environment variable name means to substitute
1668 the value of that variable. The variable name should be terminated
1669 with a character not a letter, digit or underscore; otherwise, enclose
1670 the entire variable name in braces.
1672 If `/~' appears, all of FILENAME through that `/' is discarded.
1673 If `//' appears, everything up to and including the first of
1674 those `/' is discarded. */)
1675 (Lisp_Object filename
)
1677 char *nm
, *p
, *x
, *endp
;
1678 bool substituted
= false;
1681 Lisp_Object handler
;
1683 CHECK_STRING (filename
);
1685 multibyte
= STRING_MULTIBYTE (filename
);
1687 /* If the file name has special constructs in it,
1688 call the corresponding file handler. */
1689 handler
= Ffind_file_name_handler (filename
, Qsubstitute_in_file_name
);
1690 if (!NILP (handler
))
1692 Lisp_Object handled_name
= call2 (handler
, Qsubstitute_in_file_name
,
1694 if (STRINGP (handled_name
))
1695 return handled_name
;
1696 error ("Invalid handler in `file-name-handler-alist'");
1699 /* Always work on a copy of the string, in case GC happens during
1700 decode of environment variables, causing the original Lisp_String
1701 data to be relocated. */
1703 SAFE_ALLOCA_STRING (nm
, filename
);
1706 dostounix_filename (nm
);
1707 substituted
= (memcmp (nm
, SDATA (filename
), SBYTES (filename
)) != 0);
1709 endp
= nm
+ SBYTES (filename
);
1711 /* If /~ or // appears, discard everything through first slash. */
1712 p
= search_embedded_absfilename (nm
, endp
);
1714 /* Start over with the new string, so we check the file-name-handler
1715 again. Important with filenames like "/home/foo//:/hello///there"
1716 which would substitute to "/:/hello///there" rather than "/there". */
1719 = (Fsubstitute_in_file_name
1720 (make_specified_string (p
, -1, endp
- p
, multibyte
)));
1725 /* See if any variables are substituted into the string. */
1727 if (!NILP (Ffboundp (Qsubstitute_env_in_file_name
)))
1730 = (!substituted
? filename
1731 : make_specified_string (nm
, -1, endp
- nm
, multibyte
));
1732 Lisp_Object tmp
= call1 (Qsubstitute_env_in_file_name
, name
);
1734 if (!EQ (tmp
, name
))
1742 if (!NILP (Vw32_downcase_file_names
))
1743 filename
= Fdowncase (filename
);
1749 xnm
= SSDATA (filename
);
1750 x
= xnm
+ SBYTES (filename
);
1752 /* If /~ or // appears, discard everything through first slash. */
1753 while ((p
= search_embedded_absfilename (xnm
, x
)) != NULL
)
1754 /* This time we do not start over because we've already expanded envvars
1755 and replaced $$ with $. Maybe we should start over as well, but we'd
1756 need to quote some $ to $$ first. */
1760 if (!NILP (Vw32_downcase_file_names
))
1762 Lisp_Object xname
= make_specified_string (xnm
, -1, x
- xnm
, multibyte
);
1764 filename
= Fdowncase (xname
);
1768 if (xnm
!= SSDATA (filename
))
1769 filename
= make_specified_string (xnm
, -1, x
- xnm
, multibyte
);
1774 /* A slightly faster and more convenient way to get
1775 (directory-file-name (expand-file-name FOO)). */
1778 expand_and_dir_to_file (Lisp_Object filename
, Lisp_Object defdir
)
1780 register Lisp_Object absname
;
1782 absname
= Fexpand_file_name (filename
, defdir
);
1784 /* Remove final slash, if any (unless this is the root dir).
1785 stat behaves differently depending! */
1786 if (SCHARS (absname
) > 1
1787 && IS_DIRECTORY_SEP (SREF (absname
, SBYTES (absname
) - 1))
1788 && !IS_DEVICE_SEP (SREF (absname
, SBYTES (absname
) - 2)))
1789 /* We cannot take shortcuts; they might be wrong for magic file names. */
1790 absname
= Fdirectory_file_name (absname
);
1794 /* Signal an error if the file ABSNAME already exists.
1795 If KNOWN_TO_EXIST, the file is known to exist.
1796 QUERYSTRING is a name for the action that is being considered
1798 If INTERACTIVE, ask the user whether to proceed,
1799 and bypass the error if the user says to go ahead.
1800 If QUICK, ask for y or n, not yes or no. */
1803 barf_or_query_if_file_exists (Lisp_Object absname
, bool known_to_exist
,
1804 const char *querystring
, bool interactive
,
1807 Lisp_Object tem
, encoded_filename
;
1808 struct stat statbuf
;
1810 encoded_filename
= ENCODE_FILE (absname
);
1812 if (! known_to_exist
&& lstat (SSDATA (encoded_filename
), &statbuf
) == 0)
1814 if (S_ISDIR (statbuf
.st_mode
))
1815 xsignal2 (Qfile_error
,
1816 build_string ("File is a directory"), absname
);
1817 known_to_exist
= true;
1823 xsignal2 (Qfile_already_exists
,
1824 build_string ("File already exists"), absname
);
1825 AUTO_STRING (format
, "File %s already exists; %s anyway? ");
1826 tem
= CALLN (Fformat
, format
, absname
, build_string (querystring
));
1828 tem
= call1 (intern ("y-or-n-p"), tem
);
1830 tem
= do_yes_or_no_p (tem
);
1832 xsignal2 (Qfile_already_exists
,
1833 build_string ("File already exists"), absname
);
1838 /* Copy data to DEST from SOURCE if possible. Return true if OK. */
1840 clone_file (int dest
, int source
)
1843 return ioctl (dest
, FICLONE
, source
) == 0;
1849 DEFUN ("copy-file", Fcopy_file
, Scopy_file
, 2, 6,
1850 "fCopy file: \nGCopy %s to file: \np\nP",
1851 doc
: /* Copy FILE to NEWNAME. Both args must be strings.
1852 If NEWNAME names a directory, copy FILE there.
1854 This function always sets the file modes of the output file to match
1857 The optional third argument OK-IF-ALREADY-EXISTS specifies what to do
1858 if file NEWNAME already exists. If OK-IF-ALREADY-EXISTS is nil, we
1859 signal a `file-already-exists' error without overwriting. If
1860 OK-IF-ALREADY-EXISTS is a number, we request confirmation from the user
1861 about overwriting; this is what happens in interactive use with M-x.
1862 Any other value for OK-IF-ALREADY-EXISTS means to overwrite the
1865 Fourth arg KEEP-TIME non-nil means give the output file the same
1866 last-modified time as the old one. (This works on only some systems.)
1868 A prefix arg makes KEEP-TIME non-nil.
1870 If PRESERVE-UID-GID is non-nil, we try to transfer the
1871 uid and gid of FILE to NEWNAME.
1873 If PRESERVE-PERMISSIONS is non-nil, copy permissions of FILE to NEWNAME;
1874 this includes the file modes, along with ACL entries and SELinux
1875 context if present. Otherwise, if NEWNAME is created its file
1876 permission bits are those of FILE, masked by the default file
1878 (Lisp_Object file
, Lisp_Object newname
, Lisp_Object ok_if_already_exists
,
1879 Lisp_Object keep_time
, Lisp_Object preserve_uid_gid
,
1880 Lisp_Object preserve_permissions
)
1882 Lisp_Object handler
;
1883 ptrdiff_t count
= SPECPDL_INDEX ();
1884 Lisp_Object encoded_file
, encoded_newname
;
1886 security_context_t con
;
1892 bool already_exists
= false;
1898 encoded_file
= encoded_newname
= Qnil
;
1899 CHECK_STRING (file
);
1900 CHECK_STRING (newname
);
1902 if (!NILP (Ffile_directory_p (newname
)))
1903 newname
= Fexpand_file_name (Ffile_name_nondirectory (file
), newname
);
1905 newname
= Fexpand_file_name (newname
, Qnil
);
1907 file
= Fexpand_file_name (file
, Qnil
);
1909 /* If the input file name has special constructs in it,
1910 call the corresponding file handler. */
1911 handler
= Ffind_file_name_handler (file
, Qcopy_file
);
1912 /* Likewise for output file name. */
1914 handler
= Ffind_file_name_handler (newname
, Qcopy_file
);
1915 if (!NILP (handler
))
1916 return call7 (handler
, Qcopy_file
, file
, newname
,
1917 ok_if_already_exists
, keep_time
, preserve_uid_gid
,
1918 preserve_permissions
);
1920 encoded_file
= ENCODE_FILE (file
);
1921 encoded_newname
= ENCODE_FILE (newname
);
1924 if (NILP (ok_if_already_exists
)
1925 || INTEGERP (ok_if_already_exists
))
1926 barf_or_query_if_file_exists (newname
, false, "copy to it",
1927 INTEGERP (ok_if_already_exists
), false);
1929 result
= w32_copy_file (SSDATA (encoded_file
), SSDATA (encoded_newname
),
1930 !NILP (keep_time
), !NILP (preserve_uid_gid
),
1931 !NILP (preserve_permissions
));
1935 report_file_error ("Copying file", list2 (file
, newname
));
1937 report_file_error ("Copying permissions from", file
);
1939 xsignal2 (Qfile_date_error
,
1940 build_string ("Resetting file times"), newname
);
1942 report_file_error ("Copying permissions to", newname
);
1944 #else /* not WINDOWSNT */
1946 ifd
= emacs_open (SSDATA (encoded_file
), O_RDONLY
, 0);
1950 report_file_error ("Opening input file", file
);
1952 record_unwind_protect_int (close_file_unwind
, ifd
);
1954 if (fstat (ifd
, &st
) != 0)
1955 report_file_error ("Input file status", file
);
1957 if (!NILP (preserve_permissions
))
1960 if (is_selinux_enabled ())
1962 conlength
= fgetfilecon (ifd
, &con
);
1963 if (conlength
== -1)
1964 report_file_error ("Doing fgetfilecon", file
);
1969 /* We can copy only regular files. */
1970 if (!S_ISREG (st
.st_mode
))
1971 report_file_errno ("Non-regular file", file
,
1972 S_ISDIR (st
.st_mode
) ? EISDIR
: EINVAL
);
1975 new_mask
= st
.st_mode
& (!NILP (preserve_uid_gid
) ? 0700 : 0777);
1977 new_mask
= S_IREAD
| S_IWRITE
;
1980 ofd
= emacs_open (SSDATA (encoded_newname
), O_WRONLY
| O_CREAT
| O_EXCL
,
1982 if (ofd
< 0 && errno
== EEXIST
)
1984 if (NILP (ok_if_already_exists
) || INTEGERP (ok_if_already_exists
))
1985 barf_or_query_if_file_exists (newname
, true, "copy to it",
1986 INTEGERP (ok_if_already_exists
), false);
1987 already_exists
= true;
1988 ofd
= emacs_open (SSDATA (encoded_newname
), O_WRONLY
, 0);
1991 report_file_error ("Opening output file", newname
);
1993 record_unwind_protect_int (close_file_unwind
, ofd
);
1995 off_t oldsize
= 0, newsize
;
2000 if (fstat (ofd
, &out_st
) != 0)
2001 report_file_error ("Output file status", newname
);
2002 if (st
.st_dev
== out_st
.st_dev
&& st
.st_ino
== out_st
.st_ino
)
2003 report_file_errno ("Input and output files are the same",
2004 list2 (file
, newname
), 0);
2005 if (S_ISREG (out_st
.st_mode
))
2006 oldsize
= out_st
.st_size
;
2012 if (clone_file (ofd
, ifd
))
2013 newsize
= st
.st_size
;
2016 char buf
[MAX_ALLOCA
];
2018 for (newsize
= 0; 0 < (n
= emacs_read (ifd
, buf
, sizeof buf
));
2020 if (emacs_write_sig (ofd
, buf
, n
) != n
)
2021 report_file_error ("Write error", newname
);
2023 report_file_error ("Read error", file
);
2026 /* Truncate any existing output file after writing the data. This
2027 is more likely to work than truncation before writing, if the
2028 file system is out of space or the user is over disk quota. */
2029 if (newsize
< oldsize
&& ftruncate (ofd
, newsize
) != 0)
2030 report_file_error ("Truncating output file", newname
);
2035 /* Preserve the original file permissions, and if requested, also its
2038 mode_t preserved_permissions
= st
.st_mode
& 07777;
2039 mode_t default_permissions
= st
.st_mode
& 0777 & ~realmask
;
2040 if (!NILP (preserve_uid_gid
))
2042 /* Attempt to change owner and group. If that doesn't work
2043 attempt to change just the group, as that is sometimes allowed.
2044 Adjust the mode mask to eliminate setuid or setgid bits
2045 or group permissions bits that are inappropriate if the
2046 owner or group are wrong. */
2047 if (fchown (ofd
, st
.st_uid
, st
.st_gid
) != 0)
2049 if (fchown (ofd
, -1, st
.st_gid
) == 0)
2050 preserved_permissions
&= ~04000;
2053 preserved_permissions
&= ~06000;
2055 /* Copy the other bits to the group bits, since the
2057 preserved_permissions
&= ~070;
2058 preserved_permissions
|= (preserved_permissions
& 7) << 3;
2059 default_permissions
&= ~070;
2060 default_permissions
|= (default_permissions
& 7) << 3;
2065 switch (!NILP (preserve_permissions
)
2066 ? qcopy_acl (SSDATA (encoded_file
), ifd
,
2067 SSDATA (encoded_newname
), ofd
,
2068 preserved_permissions
)
2070 || (new_mask
& ~realmask
) == default_permissions
)
2072 : fchmod (ofd
, default_permissions
))
2074 case -2: report_file_error ("Copying permissions from", file
);
2075 case -1: report_file_error ("Copying permissions to", newname
);
2078 #endif /* not MSDOS */
2083 /* Set the modified context back to the file. */
2084 bool fail
= fsetfilecon (ofd
, con
) != 0;
2085 /* See http://debbugs.gnu.org/11245 for ENOTSUP. */
2086 if (fail
&& errno
!= ENOTSUP
)
2087 report_file_error ("Doing fsetfilecon", newname
);
2093 if (!NILP (keep_time
))
2095 struct timespec atime
= get_stat_atime (&st
);
2096 struct timespec mtime
= get_stat_mtime (&st
);
2097 if (set_file_times (ofd
, SSDATA (encoded_newname
), atime
, mtime
) != 0)
2098 xsignal2 (Qfile_date_error
,
2099 build_string ("Cannot set file date"), newname
);
2102 if (emacs_close (ofd
) < 0)
2103 report_file_error ("Write error", newname
);
2108 /* In DJGPP v2.0 and later, fstat usually returns true file mode bits,
2109 and if it can't, it tells so. Otherwise, under MSDOS we usually
2110 get only the READ bit, which will make the copied file read-only,
2111 so it's better not to chmod at all. */
2112 if ((_djstat_flags
& _STFAIL_WRITEBIT
) == 0)
2113 chmod (SDATA (encoded_newname
), st
.st_mode
& 07777);
2115 #endif /* not WINDOWSNT */
2117 /* Discard the unwind protects. */
2118 specpdl_ptr
= specpdl
+ count
;
2123 DEFUN ("make-directory-internal", Fmake_directory_internal
,
2124 Smake_directory_internal
, 1, 1, 0,
2125 doc
: /* Create a new directory named DIRECTORY. */)
2126 (Lisp_Object directory
)
2129 Lisp_Object handler
;
2130 Lisp_Object encoded_dir
;
2132 CHECK_STRING (directory
);
2133 directory
= Fexpand_file_name (directory
, Qnil
);
2135 handler
= Ffind_file_name_handler (directory
, Qmake_directory_internal
);
2136 if (!NILP (handler
))
2137 return call2 (handler
, Qmake_directory_internal
, directory
);
2139 encoded_dir
= ENCODE_FILE (directory
);
2141 dir
= SSDATA (encoded_dir
);
2144 if (mkdir (dir
) != 0)
2146 if (mkdir (dir
, 0777 & ~auto_saving_dir_umask
) != 0)
2148 report_file_error ("Creating directory", directory
);
2153 DEFUN ("delete-directory-internal", Fdelete_directory_internal
,
2154 Sdelete_directory_internal
, 1, 1, 0,
2155 doc
: /* Delete the directory named DIRECTORY. Does not follow symlinks. */)
2156 (Lisp_Object directory
)
2159 Lisp_Object encoded_dir
;
2161 CHECK_STRING (directory
);
2162 directory
= Fdirectory_file_name (Fexpand_file_name (directory
, Qnil
));
2163 encoded_dir
= ENCODE_FILE (directory
);
2164 dir
= SSDATA (encoded_dir
);
2166 if (rmdir (dir
) != 0)
2167 report_file_error ("Removing directory", directory
);
2172 DEFUN ("delete-file", Fdelete_file
, Sdelete_file
, 1, 2,
2173 "(list (read-file-name \
2174 (if (and delete-by-moving-to-trash (null current-prefix-arg)) \
2175 \"Move file to trash: \" \"Delete file: \") \
2176 nil default-directory (confirm-nonexistent-file-or-buffer)) \
2177 (null current-prefix-arg))",
2178 doc
: /* Delete file named FILENAME. If it is a symlink, remove the symlink.
2179 If file has multiple names, it continues to exist with the other names.
2180 TRASH non-nil means to trash the file instead of deleting, provided
2181 `delete-by-moving-to-trash' is non-nil.
2183 When called interactively, TRASH is t if no prefix argument is given.
2184 With a prefix argument, TRASH is nil. */)
2185 (Lisp_Object filename
, Lisp_Object trash
)
2187 Lisp_Object handler
;
2188 Lisp_Object encoded_file
;
2190 if (!NILP (Ffile_directory_p (filename
))
2191 && NILP (Ffile_symlink_p (filename
)))
2192 xsignal2 (Qfile_error
,
2193 build_string ("Removing old name: is a directory"),
2195 filename
= Fexpand_file_name (filename
, Qnil
);
2197 handler
= Ffind_file_name_handler (filename
, Qdelete_file
);
2198 if (!NILP (handler
))
2199 return call3 (handler
, Qdelete_file
, filename
, trash
);
2201 if (delete_by_moving_to_trash
&& !NILP (trash
))
2202 return call1 (Qmove_file_to_trash
, filename
);
2204 encoded_file
= ENCODE_FILE (filename
);
2206 if (unlink (SSDATA (encoded_file
)) < 0)
2207 report_file_error ("Removing old name", filename
);
2212 internal_delete_file_1 (Lisp_Object ignore
)
2217 /* Delete file FILENAME, returning true if successful.
2218 This ignores `delete-by-moving-to-trash'. */
2221 internal_delete_file (Lisp_Object filename
)
2225 tem
= internal_condition_case_2 (Fdelete_file
, filename
, Qnil
,
2226 Qt
, internal_delete_file_1
);
2230 DEFUN ("rename-file", Frename_file
, Srename_file
, 2, 3,
2231 "fRename file: \nGRename %s to file: \np",
2232 doc
: /* Rename FILE as NEWNAME. Both args must be strings.
2233 If file has names other than FILE, it continues to have those names.
2234 Signals a `file-already-exists' error if a file NEWNAME already exists
2235 unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.
2236 A number as third arg means request confirmation if NEWNAME already exists.
2237 This is what happens in interactive use with M-x. */)
2238 (Lisp_Object file
, Lisp_Object newname
, Lisp_Object ok_if_already_exists
)
2240 Lisp_Object handler
;
2241 Lisp_Object encoded_file
, encoded_newname
, symlink_target
;
2243 symlink_target
= encoded_file
= encoded_newname
= Qnil
;
2244 CHECK_STRING (file
);
2245 CHECK_STRING (newname
);
2246 file
= Fexpand_file_name (file
, Qnil
);
2248 if ((!NILP (Ffile_directory_p (newname
)))
2250 /* If the file names are identical but for the case,
2251 don't attempt to move directory to itself. */
2252 && (NILP (Fstring_equal (Fdowncase (file
), Fdowncase (newname
))))
2256 Lisp_Object fname
= (NILP (Ffile_directory_p (file
))
2257 ? file
: Fdirectory_file_name (file
));
2258 newname
= Fexpand_file_name (Ffile_name_nondirectory (fname
), newname
);
2261 newname
= Fexpand_file_name (newname
, Qnil
);
2263 /* If the file name has special constructs in it,
2264 call the corresponding file handler. */
2265 handler
= Ffind_file_name_handler (file
, Qrename_file
);
2267 handler
= Ffind_file_name_handler (newname
, Qrename_file
);
2268 if (!NILP (handler
))
2269 return call4 (handler
, Qrename_file
,
2270 file
, newname
, ok_if_already_exists
);
2272 encoded_file
= ENCODE_FILE (file
);
2273 encoded_newname
= ENCODE_FILE (newname
);
2276 /* If the file names are identical but for the case, don't ask for
2277 confirmation: they simply want to change the letter-case of the
2279 if (NILP (Fstring_equal (Fdowncase (file
), Fdowncase (newname
))))
2281 if (NILP (ok_if_already_exists
)
2282 || INTEGERP (ok_if_already_exists
))
2283 barf_or_query_if_file_exists (newname
, false, "rename to it",
2284 INTEGERP (ok_if_already_exists
), false);
2285 if (rename (SSDATA (encoded_file
), SSDATA (encoded_newname
)) < 0)
2287 int rename_errno
= errno
;
2288 if (rename_errno
== EXDEV
)
2291 symlink_target
= Ffile_symlink_p (file
);
2292 if (! NILP (symlink_target
))
2293 Fmake_symbolic_link (symlink_target
, newname
,
2294 NILP (ok_if_already_exists
) ? Qnil
: Qt
);
2295 else if (!NILP (Ffile_directory_p (file
)))
2296 call4 (Qcopy_directory
, file
, newname
, Qt
, Qnil
);
2298 /* We have already prompted if it was an integer, so don't
2299 have copy-file prompt again. */
2300 Fcopy_file (file
, newname
,
2301 NILP (ok_if_already_exists
) ? Qnil
: Qt
,
2304 count
= SPECPDL_INDEX ();
2305 specbind (Qdelete_by_moving_to_trash
, Qnil
);
2307 if (!NILP (Ffile_directory_p (file
)) && NILP (symlink_target
))
2308 call2 (Qdelete_directory
, file
, Qt
);
2310 Fdelete_file (file
, Qnil
);
2311 unbind_to (count
, Qnil
);
2314 report_file_errno ("Renaming", list2 (file
, newname
), rename_errno
);
2320 DEFUN ("add-name-to-file", Fadd_name_to_file
, Sadd_name_to_file
, 2, 3,
2321 "fAdd name to file: \nGName to add to %s: \np",
2322 doc
: /* Give FILE additional name NEWNAME. Both args must be strings.
2323 Signals a `file-already-exists' error if a file NEWNAME already exists
2324 unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.
2325 A number as third arg means request confirmation if NEWNAME already exists.
2326 This is what happens in interactive use with M-x. */)
2327 (Lisp_Object file
, Lisp_Object newname
, Lisp_Object ok_if_already_exists
)
2329 Lisp_Object handler
;
2330 Lisp_Object encoded_file
, encoded_newname
;
2332 encoded_file
= encoded_newname
= Qnil
;
2333 CHECK_STRING (file
);
2334 CHECK_STRING (newname
);
2335 file
= Fexpand_file_name (file
, Qnil
);
2337 if (!NILP (Ffile_directory_p (newname
)))
2338 newname
= Fexpand_file_name (Ffile_name_nondirectory (file
), newname
);
2340 newname
= Fexpand_file_name (newname
, Qnil
);
2342 /* If the file name has special constructs in it,
2343 call the corresponding file handler. */
2344 handler
= Ffind_file_name_handler (file
, Qadd_name_to_file
);
2345 if (!NILP (handler
))
2346 return call4 (handler
, Qadd_name_to_file
, file
,
2347 newname
, ok_if_already_exists
);
2349 /* If the new name has special constructs in it,
2350 call the corresponding file handler. */
2351 handler
= Ffind_file_name_handler (newname
, Qadd_name_to_file
);
2352 if (!NILP (handler
))
2353 return call4 (handler
, Qadd_name_to_file
, file
,
2354 newname
, ok_if_already_exists
);
2356 encoded_file
= ENCODE_FILE (file
);
2357 encoded_newname
= ENCODE_FILE (newname
);
2359 if (NILP (ok_if_already_exists
)
2360 || INTEGERP (ok_if_already_exists
))
2361 barf_or_query_if_file_exists (newname
, false, "make it a new name",
2362 INTEGERP (ok_if_already_exists
), false);
2364 unlink (SSDATA (newname
));
2365 if (link (SSDATA (encoded_file
), SSDATA (encoded_newname
)) < 0)
2367 int link_errno
= errno
;
2368 report_file_errno ("Adding new name", list2 (file
, newname
), link_errno
);
2374 DEFUN ("make-symbolic-link", Fmake_symbolic_link
, Smake_symbolic_link
, 2, 3,
2375 "FMake symbolic link to file: \nGMake symbolic link to file %s: \np",
2376 doc
: /* Make a symbolic link to TARGET, named LINKNAME.
2377 Both args must be strings.
2378 Signals a `file-already-exists' error if a file LINKNAME already exists
2379 unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.
2380 A number as third arg means request confirmation if LINKNAME already exists.
2381 This happens for interactive use with M-x. */)
2382 (Lisp_Object target
, Lisp_Object linkname
, Lisp_Object ok_if_already_exists
)
2384 Lisp_Object handler
;
2385 Lisp_Object encoded_target
, encoded_linkname
;
2387 encoded_target
= encoded_linkname
= Qnil
;
2388 CHECK_STRING (target
);
2389 CHECK_STRING (linkname
);
2390 /* If the link target has a ~, we must expand it to get
2391 a truly valid file name. Otherwise, do not expand;
2392 we want to permit links to relative file names. */
2393 if (SREF (target
, 0) == '~')
2394 target
= Fexpand_file_name (target
, Qnil
);
2396 if (!NILP (Ffile_directory_p (linkname
)))
2397 linkname
= Fexpand_file_name (Ffile_name_nondirectory (target
), linkname
);
2399 linkname
= Fexpand_file_name (linkname
, Qnil
);
2401 /* If the file name has special constructs in it,
2402 call the corresponding file handler. */
2403 handler
= Ffind_file_name_handler (target
, Qmake_symbolic_link
);
2404 if (!NILP (handler
))
2405 return call4 (handler
, Qmake_symbolic_link
, target
,
2406 linkname
, ok_if_already_exists
);
2408 /* If the new link name has special constructs in it,
2409 call the corresponding file handler. */
2410 handler
= Ffind_file_name_handler (linkname
, Qmake_symbolic_link
);
2411 if (!NILP (handler
))
2412 return call4 (handler
, Qmake_symbolic_link
, target
,
2413 linkname
, ok_if_already_exists
);
2415 encoded_target
= ENCODE_FILE (target
);
2416 encoded_linkname
= ENCODE_FILE (linkname
);
2418 if (NILP (ok_if_already_exists
)
2419 || INTEGERP (ok_if_already_exists
))
2420 barf_or_query_if_file_exists (linkname
, false, "make it a link",
2421 INTEGERP (ok_if_already_exists
), false);
2422 if (symlink (SSDATA (encoded_target
), SSDATA (encoded_linkname
)) < 0)
2424 /* If we didn't complain already, silently delete existing file. */
2426 if (errno
== EEXIST
)
2428 unlink (SSDATA (encoded_linkname
));
2429 if (symlink (SSDATA (encoded_target
), SSDATA (encoded_linkname
))
2433 if (errno
== ENOSYS
)
2434 xsignal1 (Qfile_error
,
2435 build_string ("Symbolic links are not supported"));
2437 symlink_errno
= errno
;
2438 report_file_errno ("Making symbolic link", list2 (target
, linkname
),
2446 DEFUN ("file-name-absolute-p", Ffile_name_absolute_p
, Sfile_name_absolute_p
,
2448 doc
: /* Return t if file FILENAME specifies an absolute file name.
2449 On Unix, this is a name starting with a `/' or a `~'. */)
2450 (Lisp_Object filename
)
2452 CHECK_STRING (filename
);
2453 return file_name_absolute_p (SSDATA (filename
)) ? Qt
: Qnil
;
2456 DEFUN ("file-exists-p", Ffile_exists_p
, Sfile_exists_p
, 1, 1, 0,
2457 doc
: /* Return t if file FILENAME exists (whether or not you can read it.)
2458 See also `file-readable-p' and `file-attributes'.
2459 This returns nil for a symlink to a nonexistent file.
2460 Use `file-symlink-p' to test for such links. */)
2461 (Lisp_Object filename
)
2463 Lisp_Object absname
;
2464 Lisp_Object handler
;
2466 CHECK_STRING (filename
);
2467 absname
= Fexpand_file_name (filename
, Qnil
);
2469 /* If the file name has special constructs in it,
2470 call the corresponding file handler. */
2471 handler
= Ffind_file_name_handler (absname
, Qfile_exists_p
);
2472 if (!NILP (handler
))
2474 Lisp_Object result
= call2 (handler
, Qfile_exists_p
, absname
);
2479 absname
= ENCODE_FILE (absname
);
2481 return check_existing (SSDATA (absname
)) ? Qt
: Qnil
;
2484 DEFUN ("file-executable-p", Ffile_executable_p
, Sfile_executable_p
, 1, 1, 0,
2485 doc
: /* Return t if FILENAME can be executed by you.
2486 For a directory, this means you can access files in that directory.
2487 \(It is generally better to use `file-accessible-directory-p' for that
2488 purpose, though.) */)
2489 (Lisp_Object filename
)
2491 Lisp_Object absname
;
2492 Lisp_Object handler
;
2494 CHECK_STRING (filename
);
2495 absname
= Fexpand_file_name (filename
, Qnil
);
2497 /* If the file name has special constructs in it,
2498 call the corresponding file handler. */
2499 handler
= Ffind_file_name_handler (absname
, Qfile_executable_p
);
2500 if (!NILP (handler
))
2501 return call2 (handler
, Qfile_executable_p
, absname
);
2503 absname
= ENCODE_FILE (absname
);
2505 return (check_executable (SSDATA (absname
)) ? Qt
: Qnil
);
2508 DEFUN ("file-readable-p", Ffile_readable_p
, Sfile_readable_p
, 1, 1, 0,
2509 doc
: /* Return t if file FILENAME exists and you can read it.
2510 See also `file-exists-p' and `file-attributes'. */)
2511 (Lisp_Object filename
)
2513 Lisp_Object absname
;
2514 Lisp_Object handler
;
2516 CHECK_STRING (filename
);
2517 absname
= Fexpand_file_name (filename
, Qnil
);
2519 /* If the file name has special constructs in it,
2520 call the corresponding file handler. */
2521 handler
= Ffind_file_name_handler (absname
, Qfile_readable_p
);
2522 if (!NILP (handler
))
2523 return call2 (handler
, Qfile_readable_p
, absname
);
2525 absname
= ENCODE_FILE (absname
);
2526 return (faccessat (AT_FDCWD
, SSDATA (absname
), R_OK
, AT_EACCESS
) == 0
2530 DEFUN ("file-writable-p", Ffile_writable_p
, Sfile_writable_p
, 1, 1, 0,
2531 doc
: /* Return t if file FILENAME can be written or created by you. */)
2532 (Lisp_Object filename
)
2534 Lisp_Object absname
, dir
, encoded
;
2535 Lisp_Object handler
;
2537 CHECK_STRING (filename
);
2538 absname
= Fexpand_file_name (filename
, Qnil
);
2540 /* If the file name has special constructs in it,
2541 call the corresponding file handler. */
2542 handler
= Ffind_file_name_handler (absname
, Qfile_writable_p
);
2543 if (!NILP (handler
))
2544 return call2 (handler
, Qfile_writable_p
, absname
);
2546 encoded
= ENCODE_FILE (absname
);
2547 if (check_writable (SSDATA (encoded
), W_OK
))
2549 if (errno
!= ENOENT
)
2552 dir
= Ffile_name_directory (absname
);
2553 eassert (!NILP (dir
));
2555 dir
= Fdirectory_file_name (dir
);
2558 dir
= ENCODE_FILE (dir
);
2560 /* The read-only attribute of the parent directory doesn't affect
2561 whether a file or directory can be created within it. Some day we
2562 should check ACLs though, which do affect this. */
2563 return file_directory_p (SSDATA (dir
)) ? Qt
: Qnil
;
2565 return check_writable (SSDATA (dir
), W_OK
| X_OK
) ? Qt
: Qnil
;
2569 DEFUN ("access-file", Faccess_file
, Saccess_file
, 2, 2, 0,
2570 doc
: /* Access file FILENAME, and get an error if that does not work.
2571 The second argument STRING is used in the error message.
2572 If there is no error, returns nil. */)
2573 (Lisp_Object filename
, Lisp_Object string
)
2575 Lisp_Object handler
, encoded_filename
, absname
;
2577 CHECK_STRING (filename
);
2578 absname
= Fexpand_file_name (filename
, Qnil
);
2580 CHECK_STRING (string
);
2582 /* If the file name has special constructs in it,
2583 call the corresponding file handler. */
2584 handler
= Ffind_file_name_handler (absname
, Qaccess_file
);
2585 if (!NILP (handler
))
2586 return call3 (handler
, Qaccess_file
, absname
, string
);
2588 encoded_filename
= ENCODE_FILE (absname
);
2590 if (faccessat (AT_FDCWD
, SSDATA (encoded_filename
), R_OK
, AT_EACCESS
) != 0)
2591 report_file_error (SSDATA (string
), filename
);
2596 /* Relative to directory FD, return the symbolic link value of FILENAME.
2597 On failure, return nil. */
2599 emacs_readlinkat (int fd
, char const *filename
)
2601 static struct allocator
const emacs_norealloc_allocator
=
2602 { xmalloc
, NULL
, xfree
, memory_full
};
2604 char readlink_buf
[1024];
2605 char *buf
= careadlinkat (fd
, filename
, readlink_buf
, sizeof readlink_buf
,
2606 &emacs_norealloc_allocator
, readlinkat
);
2610 val
= build_unibyte_string (buf
);
2611 if (buf
[0] == '/' && strchr (buf
, ':'))
2613 AUTO_STRING (slash_colon
, "/:");
2614 val
= concat2 (slash_colon
, val
);
2616 if (buf
!= readlink_buf
)
2618 val
= DECODE_FILE (val
);
2622 DEFUN ("file-symlink-p", Ffile_symlink_p
, Sfile_symlink_p
, 1, 1, 0,
2623 doc
: /* Return non-nil if file FILENAME is the name of a symbolic link.
2624 The value is the link target, as a string.
2625 Otherwise it returns nil.
2627 This function does not check whether the link target exists. */)
2628 (Lisp_Object filename
)
2630 Lisp_Object handler
;
2632 CHECK_STRING (filename
);
2633 filename
= Fexpand_file_name (filename
, Qnil
);
2635 /* If the file name has special constructs in it,
2636 call the corresponding file handler. */
2637 handler
= Ffind_file_name_handler (filename
, Qfile_symlink_p
);
2638 if (!NILP (handler
))
2639 return call2 (handler
, Qfile_symlink_p
, filename
);
2641 filename
= ENCODE_FILE (filename
);
2643 return emacs_readlinkat (AT_FDCWD
, SSDATA (filename
));
2646 DEFUN ("file-directory-p", Ffile_directory_p
, Sfile_directory_p
, 1, 1, 0,
2647 doc
: /* Return t if FILENAME names an existing directory.
2648 Symbolic links to directories count as directories.
2649 See `file-symlink-p' to distinguish symlinks. */)
2650 (Lisp_Object filename
)
2652 Lisp_Object absname
;
2653 Lisp_Object handler
;
2655 absname
= expand_and_dir_to_file (filename
, BVAR (current_buffer
, directory
));
2657 /* If the file name has special constructs in it,
2658 call the corresponding file handler. */
2659 handler
= Ffind_file_name_handler (absname
, Qfile_directory_p
);
2660 if (!NILP (handler
))
2661 return call2 (handler
, Qfile_directory_p
, absname
);
2663 absname
= ENCODE_FILE (absname
);
2665 return file_directory_p (SSDATA (absname
)) ? Qt
: Qnil
;
2668 /* Return true if FILE is a directory or a symlink to a directory. */
2670 file_directory_p (char const *file
)
2673 /* This is cheaper than 'stat'. */
2674 return faccessat (AT_FDCWD
, file
, D_OK
, AT_EACCESS
) == 0;
2677 return stat (file
, &st
) == 0 && S_ISDIR (st
.st_mode
);
2681 DEFUN ("file-accessible-directory-p", Ffile_accessible_directory_p
,
2682 Sfile_accessible_directory_p
, 1, 1, 0,
2683 doc
: /* Return t if FILENAME names a directory you can open.
2684 For the value to be t, FILENAME must specify the name of a directory
2685 as a file, and the directory must allow you to open files in it. In
2686 order to use a directory as a buffer's current directory, this
2687 predicate must return true. A directory name spec may be given
2688 instead; then the value is t if the directory so specified exists and
2689 really is a readable and searchable directory. */)
2690 (Lisp_Object filename
)
2692 Lisp_Object absname
;
2693 Lisp_Object handler
;
2695 CHECK_STRING (filename
);
2696 absname
= Fexpand_file_name (filename
, Qnil
);
2698 /* If the file name has special constructs in it,
2699 call the corresponding file handler. */
2700 handler
= Ffind_file_name_handler (absname
, Qfile_accessible_directory_p
);
2701 if (!NILP (handler
))
2703 Lisp_Object r
= call2 (handler
, Qfile_accessible_directory_p
, absname
);
2708 absname
= ENCODE_FILE (absname
);
2709 return file_accessible_directory_p (absname
) ? Qt
: Qnil
;
2712 /* If FILE is a searchable directory or a symlink to a
2713 searchable directory, return true. Otherwise return
2714 false and set errno to an error number. */
2716 file_accessible_directory_p (Lisp_Object file
)
2720 /* We need a special-purpose test because (a) NTFS security data is
2721 not reflected in Posix-style mode bits, and (b) the trick with
2722 accessing "DIR/.", used below on Posix hosts, doesn't work on
2723 Windows, because "DIR/." is normalized to just "DIR" before
2724 hitting the disk. */
2725 return (SBYTES (file
) == 0
2726 || w32_accessible_directory_p (SSDATA (file
), SBYTES (file
)));
2728 return file_directory_p (SSDATA (file
));
2731 /* On POSIXish platforms, use just one system call; this avoids a
2732 race and is typically faster. */
2733 const char *data
= SSDATA (file
);
2734 ptrdiff_t len
= SBYTES (file
);
2740 /* Normally a file "FOO" is an accessible directory if "FOO/." exists.
2741 There are three exceptions: "", "/", and "//". Leave "" alone,
2742 as it's invalid. Append only "." to the other two exceptions as
2743 "/" and "//" are distinct on some platforms, whereas "/", "///",
2744 "////", etc. are all equivalent. */
2749 /* Just check for trailing '/' when deciding whether to append '/'.
2750 That's simpler than testing the two special cases "/" and "//",
2751 and it's a safe optimization here. */
2752 char *buf
= SAFE_ALLOCA (len
+ 3);
2753 memcpy (buf
, data
, len
);
2754 strcpy (buf
+ len
, &"/."[data
[len
- 1] == '/']);
2758 ok
= check_existing (dir
);
2759 saved_errno
= errno
;
2761 errno
= saved_errno
;
2763 #endif /* !DOS_NT */
2766 DEFUN ("file-regular-p", Ffile_regular_p
, Sfile_regular_p
, 1, 1, 0,
2767 doc
: /* Return t if FILENAME names a regular file.
2768 This is the sort of file that holds an ordinary stream of data bytes.
2769 Symbolic links to regular files count as regular files.
2770 See `file-symlink-p' to distinguish symlinks. */)
2771 (Lisp_Object filename
)
2773 register Lisp_Object absname
;
2775 Lisp_Object handler
;
2777 absname
= expand_and_dir_to_file (filename
, BVAR (current_buffer
, directory
));
2779 /* If the file name has special constructs in it,
2780 call the corresponding file handler. */
2781 handler
= Ffind_file_name_handler (absname
, Qfile_regular_p
);
2782 if (!NILP (handler
))
2783 return call2 (handler
, Qfile_regular_p
, absname
);
2785 absname
= ENCODE_FILE (absname
);
2790 Lisp_Object tem
= Vw32_get_true_file_attributes
;
2792 /* Tell stat to use expensive method to get accurate info. */
2793 Vw32_get_true_file_attributes
= Qt
;
2794 result
= stat (SSDATA (absname
), &st
);
2795 Vw32_get_true_file_attributes
= tem
;
2799 return S_ISREG (st
.st_mode
) ? Qt
: Qnil
;
2802 if (stat (SSDATA (absname
), &st
) < 0)
2804 return S_ISREG (st
.st_mode
) ? Qt
: Qnil
;
2808 DEFUN ("file-selinux-context", Ffile_selinux_context
,
2809 Sfile_selinux_context
, 1, 1, 0,
2810 doc
: /* Return SELinux context of file named FILENAME.
2811 The return value is a list (USER ROLE TYPE RANGE), where the list
2812 elements are strings naming the user, role, type, and range of the
2813 file's SELinux security context.
2815 Return (nil nil nil nil) if the file is nonexistent or inaccessible,
2816 or if SELinux is disabled, or if Emacs lacks SELinux support. */)
2817 (Lisp_Object filename
)
2819 Lisp_Object absname
;
2820 Lisp_Object user
= Qnil
, role
= Qnil
, type
= Qnil
, range
= Qnil
;
2822 Lisp_Object handler
;
2824 security_context_t con
;
2829 absname
= expand_and_dir_to_file (filename
, BVAR (current_buffer
, directory
));
2831 /* If the file name has special constructs in it,
2832 call the corresponding file handler. */
2833 handler
= Ffind_file_name_handler (absname
, Qfile_selinux_context
);
2834 if (!NILP (handler
))
2835 return call2 (handler
, Qfile_selinux_context
, absname
);
2837 absname
= ENCODE_FILE (absname
);
2840 if (is_selinux_enabled ())
2842 conlength
= lgetfilecon (SSDATA (absname
), &con
);
2845 context
= context_new (con
);
2846 if (context_user_get (context
))
2847 user
= build_string (context_user_get (context
));
2848 if (context_role_get (context
))
2849 role
= build_string (context_role_get (context
));
2850 if (context_type_get (context
))
2851 type
= build_string (context_type_get (context
));
2852 if (context_range_get (context
))
2853 range
= build_string (context_range_get (context
));
2854 context_free (context
);
2860 return list4 (user
, role
, type
, range
);
2863 DEFUN ("set-file-selinux-context", Fset_file_selinux_context
,
2864 Sset_file_selinux_context
, 2, 2, 0,
2865 doc
: /* Set SELinux context of file named FILENAME to CONTEXT.
2866 CONTEXT should be a list (USER ROLE TYPE RANGE), where the list
2867 elements are strings naming the components of a SELinux context.
2869 Value is t if setting of SELinux context was successful, nil otherwise.
2871 This function does nothing and returns nil if SELinux is disabled,
2872 or if Emacs was not compiled with SELinux support. */)
2873 (Lisp_Object filename
, Lisp_Object context
)
2875 Lisp_Object absname
;
2876 Lisp_Object handler
;
2878 Lisp_Object encoded_absname
;
2879 Lisp_Object user
= CAR_SAFE (context
);
2880 Lisp_Object role
= CAR_SAFE (CDR_SAFE (context
));
2881 Lisp_Object type
= CAR_SAFE (CDR_SAFE (CDR_SAFE (context
)));
2882 Lisp_Object range
= CAR_SAFE (CDR_SAFE (CDR_SAFE (CDR_SAFE (context
))));
2883 security_context_t con
;
2886 context_t parsed_con
;
2889 absname
= Fexpand_file_name (filename
, BVAR (current_buffer
, directory
));
2891 /* If the file name has special constructs in it,
2892 call the corresponding file handler. */
2893 handler
= Ffind_file_name_handler (absname
, Qset_file_selinux_context
);
2894 if (!NILP (handler
))
2895 return call3 (handler
, Qset_file_selinux_context
, absname
, context
);
2898 if (is_selinux_enabled ())
2900 /* Get current file context. */
2901 encoded_absname
= ENCODE_FILE (absname
);
2902 conlength
= lgetfilecon (SSDATA (encoded_absname
), &con
);
2905 parsed_con
= context_new (con
);
2906 /* Change the parts defined in the parameter.*/
2909 if (context_user_set (parsed_con
, SSDATA (user
)))
2910 error ("Doing context_user_set");
2914 if (context_role_set (parsed_con
, SSDATA (role
)))
2915 error ("Doing context_role_set");
2919 if (context_type_set (parsed_con
, SSDATA (type
)))
2920 error ("Doing context_type_set");
2922 if (STRINGP (range
))
2924 if (context_range_set (parsed_con
, SSDATA (range
)))
2925 error ("Doing context_range_set");
2928 /* Set the modified context back to the file. */
2929 fail
= (lsetfilecon (SSDATA (encoded_absname
),
2930 context_str (parsed_con
))
2932 /* See http://debbugs.gnu.org/11245 for ENOTSUP. */
2933 if (fail
&& errno
!= ENOTSUP
)
2934 report_file_error ("Doing lsetfilecon", absname
);
2936 context_free (parsed_con
);
2938 return fail
? Qnil
: Qt
;
2941 report_file_error ("Doing lgetfilecon", absname
);
2948 DEFUN ("file-acl", Ffile_acl
, Sfile_acl
, 1, 1, 0,
2949 doc
: /* Return ACL entries of file named FILENAME.
2950 The entries are returned in a format suitable for use in `set-file-acl'
2951 but is otherwise undocumented and subject to change.
2952 Return nil if file does not exist or is not accessible, or if Emacs
2953 was unable to determine the ACL entries. */)
2954 (Lisp_Object filename
)
2957 Lisp_Object absname
;
2958 Lisp_Object handler
;
2959 # ifdef HAVE_ACL_SET_FILE
2961 Lisp_Object acl_string
;
2963 # ifndef HAVE_ACL_TYPE_EXTENDED
2964 acl_type_t ACL_TYPE_EXTENDED
= ACL_TYPE_ACCESS
;
2968 absname
= expand_and_dir_to_file (filename
,
2969 BVAR (current_buffer
, directory
));
2971 /* If the file name has special constructs in it,
2972 call the corresponding file handler. */
2973 handler
= Ffind_file_name_handler (absname
, Qfile_acl
);
2974 if (!NILP (handler
))
2975 return call2 (handler
, Qfile_acl
, absname
);
2977 # ifdef HAVE_ACL_SET_FILE
2978 absname
= ENCODE_FILE (absname
);
2980 acl
= acl_get_file (SSDATA (absname
), ACL_TYPE_EXTENDED
);
2984 str
= acl_to_text (acl
, NULL
);
2991 acl_string
= build_string (str
);
3002 DEFUN ("set-file-acl", Fset_file_acl
, Sset_file_acl
,
3004 doc
: /* Set ACL of file named FILENAME to ACL-STRING.
3005 ACL-STRING should contain the textual representation of the ACL
3006 entries in a format suitable for the platform.
3008 Value is t if setting of ACL was successful, nil otherwise.
3010 Setting ACL for local files requires Emacs to be built with ACL
3012 (Lisp_Object filename
, Lisp_Object acl_string
)
3015 Lisp_Object absname
;
3016 Lisp_Object handler
;
3017 # ifdef HAVE_ACL_SET_FILE
3018 Lisp_Object encoded_absname
;
3023 absname
= Fexpand_file_name (filename
, BVAR (current_buffer
, directory
));
3025 /* If the file name has special constructs in it,
3026 call the corresponding file handler. */
3027 handler
= Ffind_file_name_handler (absname
, Qset_file_acl
);
3028 if (!NILP (handler
))
3029 return call3 (handler
, Qset_file_acl
, absname
, acl_string
);
3031 # ifdef HAVE_ACL_SET_FILE
3032 if (STRINGP (acl_string
))
3034 acl
= acl_from_text (SSDATA (acl_string
));
3037 report_file_error ("Converting ACL", absname
);
3041 encoded_absname
= ENCODE_FILE (absname
);
3043 fail
= (acl_set_file (SSDATA (encoded_absname
), ACL_TYPE_ACCESS
,
3046 if (fail
&& acl_errno_valid (errno
))
3047 report_file_error ("Setting ACL", absname
);
3050 return fail
? Qnil
: Qt
;
3058 DEFUN ("file-modes", Ffile_modes
, Sfile_modes
, 1, 1, 0,
3059 doc
: /* Return mode bits of file named FILENAME, as an integer.
3060 Return nil, if file does not exist or is not accessible. */)
3061 (Lisp_Object filename
)
3063 Lisp_Object absname
;
3065 Lisp_Object handler
;
3067 absname
= expand_and_dir_to_file (filename
, BVAR (current_buffer
, directory
));
3069 /* If the file name has special constructs in it,
3070 call the corresponding file handler. */
3071 handler
= Ffind_file_name_handler (absname
, Qfile_modes
);
3072 if (!NILP (handler
))
3073 return call2 (handler
, Qfile_modes
, absname
);
3075 absname
= ENCODE_FILE (absname
);
3077 if (stat (SSDATA (absname
), &st
) < 0)
3080 return make_number (st
.st_mode
& 07777);
3083 DEFUN ("set-file-modes", Fset_file_modes
, Sset_file_modes
, 2, 2,
3084 "(let ((file (read-file-name \"File: \"))) \
3085 (list file (read-file-modes nil file)))",
3086 doc
: /* Set mode bits of file named FILENAME to MODE (an integer).
3087 Only the 12 low bits of MODE are used.
3089 Interactively, mode bits are read by `read-file-modes', which accepts
3090 symbolic notation, like the `chmod' command from GNU Coreutils. */)
3091 (Lisp_Object filename
, Lisp_Object mode
)
3093 Lisp_Object absname
, encoded_absname
;
3094 Lisp_Object handler
;
3096 absname
= Fexpand_file_name (filename
, BVAR (current_buffer
, directory
));
3097 CHECK_NUMBER (mode
);
3099 /* If the file name has special constructs in it,
3100 call the corresponding file handler. */
3101 handler
= Ffind_file_name_handler (absname
, Qset_file_modes
);
3102 if (!NILP (handler
))
3103 return call3 (handler
, Qset_file_modes
, absname
, mode
);
3105 encoded_absname
= ENCODE_FILE (absname
);
3107 if (chmod (SSDATA (encoded_absname
), XINT (mode
) & 07777) < 0)
3108 report_file_error ("Doing chmod", absname
);
3113 DEFUN ("set-default-file-modes", Fset_default_file_modes
, Sset_default_file_modes
, 1, 1, 0,
3114 doc
: /* Set the file permission bits for newly created files.
3115 The argument MODE should be an integer; only the low 9 bits are used.
3116 This setting is inherited by subprocesses. */)
3119 mode_t oldrealmask
, oldumask
, newumask
;
3120 CHECK_NUMBER (mode
);
3121 oldrealmask
= realmask
;
3122 newumask
= ~ XINT (mode
) & 0777;
3125 realmask
= newumask
;
3126 oldumask
= umask (newumask
);
3129 eassert (oldumask
== oldrealmask
);
3133 DEFUN ("default-file-modes", Fdefault_file_modes
, Sdefault_file_modes
, 0, 0, 0,
3134 doc
: /* Return the default file protection for created files.
3135 The value is an integer. */)
3139 XSETINT (value
, (~ realmask
) & 0777);
3144 DEFUN ("set-file-times", Fset_file_times
, Sset_file_times
, 1, 2, 0,
3145 doc
: /* Set times of file FILENAME to TIMESTAMP.
3146 Set both access and modification times.
3147 Return t on success, else nil.
3148 Use the current time if TIMESTAMP is nil. TIMESTAMP is in the format of
3150 (Lisp_Object filename
, Lisp_Object timestamp
)
3152 Lisp_Object absname
, encoded_absname
;
3153 Lisp_Object handler
;
3154 struct timespec t
= lisp_time_argument (timestamp
);
3156 absname
= Fexpand_file_name (filename
, BVAR (current_buffer
, directory
));
3158 /* If the file name has special constructs in it,
3159 call the corresponding file handler. */
3160 handler
= Ffind_file_name_handler (absname
, Qset_file_times
);
3161 if (!NILP (handler
))
3162 return call3 (handler
, Qset_file_times
, absname
, timestamp
);
3164 encoded_absname
= ENCODE_FILE (absname
);
3167 if (set_file_times (-1, SSDATA (encoded_absname
), t
, t
) != 0)
3170 /* Setting times on a directory always fails. */
3171 if (file_directory_p (SSDATA (encoded_absname
)))
3174 report_file_error ("Setting file times", absname
);
3182 DEFUN ("unix-sync", Funix_sync
, Sunix_sync
, 0, 0, "",
3183 doc
: /* Tell Unix to finish all pending disk updates. */)
3190 #endif /* HAVE_SYNC */
3192 DEFUN ("file-newer-than-file-p", Ffile_newer_than_file_p
, Sfile_newer_than_file_p
, 2, 2, 0,
3193 doc
: /* Return t if file FILE1 is newer than file FILE2.
3194 If FILE1 does not exist, the answer is nil;
3195 otherwise, if FILE2 does not exist, the answer is t. */)
3196 (Lisp_Object file1
, Lisp_Object file2
)
3198 Lisp_Object absname1
, absname2
;
3199 struct stat st1
, st2
;
3200 Lisp_Object handler
;
3202 CHECK_STRING (file1
);
3203 CHECK_STRING (file2
);
3206 absname1
= expand_and_dir_to_file (file1
, BVAR (current_buffer
, directory
));
3207 absname2
= expand_and_dir_to_file (file2
, BVAR (current_buffer
, directory
));
3209 /* If the file name has special constructs in it,
3210 call the corresponding file handler. */
3211 handler
= Ffind_file_name_handler (absname1
, Qfile_newer_than_file_p
);
3213 handler
= Ffind_file_name_handler (absname2
, Qfile_newer_than_file_p
);
3214 if (!NILP (handler
))
3215 return call3 (handler
, Qfile_newer_than_file_p
, absname1
, absname2
);
3217 absname1
= ENCODE_FILE (absname1
);
3218 absname2
= ENCODE_FILE (absname2
);
3220 if (stat (SSDATA (absname1
), &st1
) < 0)
3223 if (stat (SSDATA (absname2
), &st2
) < 0)
3226 return (timespec_cmp (get_stat_mtime (&st2
), get_stat_mtime (&st1
)) < 0
3230 #ifndef READ_BUF_SIZE
3231 #define READ_BUF_SIZE (64 << 10)
3233 /* Some buffer offsets are stored in 'int' variables. */
3234 verify (READ_BUF_SIZE
<= INT_MAX
);
3236 /* This function is called after Lisp functions to decide a coding
3237 system are called, or when they cause an error. Before they are
3238 called, the current buffer is set unibyte and it contains only a
3239 newly inserted text (thus the buffer was empty before the
3242 The functions may set markers, overlays, text properties, or even
3243 alter the buffer contents, change the current buffer.
3245 Here, we reset all those changes by:
3246 o set back the current buffer.
3247 o move all markers and overlays to BEG.
3248 o remove all text properties.
3249 o set back the buffer multibyteness. */
3252 decide_coding_unwind (Lisp_Object unwind_data
)
3254 Lisp_Object multibyte
, undo_list
, buffer
;
3256 multibyte
= XCAR (unwind_data
);
3257 unwind_data
= XCDR (unwind_data
);
3258 undo_list
= XCAR (unwind_data
);
3259 buffer
= XCDR (unwind_data
);
3261 set_buffer_internal (XBUFFER (buffer
));
3262 adjust_markers_for_delete (BEG
, BEG_BYTE
, Z
, Z_BYTE
);
3263 adjust_overlays_for_delete (BEG
, Z
- BEG
);
3264 set_buffer_intervals (current_buffer
, NULL
);
3265 TEMP_SET_PT_BOTH (BEG
, BEG_BYTE
);
3267 /* Now we are safe to change the buffer's multibyteness directly. */
3268 bset_enable_multibyte_characters (current_buffer
, multibyte
);
3269 bset_undo_list (current_buffer
, undo_list
);
3272 /* Read from a non-regular file. STATE is a Lisp_Save_Value
3273 object where slot 0 is the file descriptor, slot 1 specifies
3274 an offset to put the read bytes, and slot 2 is the maximum
3275 amount of bytes to read. Value is the number of bytes read. */
3278 read_non_regular (Lisp_Object state
)
3284 nbytes
= emacs_read (XSAVE_INTEGER (state
, 0),
3285 ((char *) BEG_ADDR
+ PT_BYTE
- BEG_BYTE
3286 + XSAVE_INTEGER (state
, 1)),
3287 XSAVE_INTEGER (state
, 2));
3289 /* Fast recycle this object for the likely next call. */
3291 return make_number (nbytes
);
3295 /* Condition-case handler used when reading from non-regular files
3296 in insert-file-contents. */
3299 read_non_regular_quit (Lisp_Object ignore
)
3304 /* Return the file offset that VAL represents, checking for type
3305 errors and overflow. */
3307 file_offset (Lisp_Object val
)
3309 if (RANGED_INTEGERP (0, val
, TYPE_MAXIMUM (off_t
)))
3314 double v
= XFLOAT_DATA (val
);
3316 && (sizeof (off_t
) < sizeof v
3317 ? v
<= TYPE_MAXIMUM (off_t
)
3318 : v
< TYPE_MAXIMUM (off_t
)))
3322 wrong_type_argument (intern ("file-offset"), val
);
3325 /* Return a special time value indicating the error number ERRNUM. */
3326 static struct timespec
3327 time_error_value (int errnum
)
3329 int ns
= (errnum
== ENOENT
|| errnum
== EACCES
|| errnum
== ENOTDIR
3330 ? NONEXISTENT_MODTIME_NSECS
3331 : UNKNOWN_MODTIME_NSECS
);
3332 return make_timespec (0, ns
);
3336 get_window_points_and_markers (void)
3338 Lisp_Object pt_marker
= Fpoint_marker ();
3340 = call3 (Qget_buffer_window_list
, Fcurrent_buffer (), Qnil
, Qt
);
3341 Lisp_Object window_markers
= windows
;
3342 /* Window markers (and point) are handled specially: rather than move to
3343 just before or just after the modified text, we try to keep the
3344 markers at the same distance (bug#19161).
3345 In general, this is wrong, but for window-markers, this should be harmless
3346 and is convenient for the end user when most of the file is unmodified,
3347 except for a few minor details near the beginning and near the end. */
3348 for (; CONSP (windows
); windows
= XCDR (windows
))
3349 if (WINDOWP (XCAR (windows
)))
3351 Lisp_Object window_marker
= XWINDOW (XCAR (windows
))->pointm
;
3353 Fcons (window_marker
, Fmarker_position (window_marker
)));
3355 return Fcons (Fcons (pt_marker
, Fpoint ()), window_markers
);
3359 restore_window_points (Lisp_Object window_markers
, ptrdiff_t inserted
,
3360 ptrdiff_t same_at_start
, ptrdiff_t same_at_end
)
3362 for (; CONSP (window_markers
); window_markers
= XCDR (window_markers
))
3363 if (CONSP (XCAR (window_markers
)))
3365 Lisp_Object car
= XCAR (window_markers
);
3366 Lisp_Object marker
= XCAR (car
);
3367 Lisp_Object oldpos
= XCDR (car
);
3368 if (MARKERP (marker
) && INTEGERP (oldpos
)
3369 && XINT (oldpos
) > same_at_start
3370 && XINT (oldpos
) < same_at_end
)
3372 ptrdiff_t oldsize
= same_at_end
- same_at_start
;
3373 ptrdiff_t newsize
= inserted
;
3374 double growth
= newsize
/ (double)oldsize
;
3376 = same_at_start
+ growth
* (XINT (oldpos
) - same_at_start
);
3377 Fset_marker (marker
, make_number (newpos
), Qnil
);
3382 /* Make sure the gap is at Z_BYTE. This is required to treat buffer
3383 text as a linear C char array. */
3385 maybe_move_gap (struct buffer
*b
)
3387 if (BUF_GPT_BYTE (b
) != BUF_Z_BYTE (b
))
3389 struct buffer
*cb
= current_buffer
;
3391 set_buffer_internal (b
);
3392 move_gap_both (Z
, Z_BYTE
);
3393 set_buffer_internal (cb
);
3397 /* FIXME: insert-file-contents should be split with the top-level moved to
3398 Elisp and only the core kept in C. */
3400 DEFUN ("insert-file-contents", Finsert_file_contents
, Sinsert_file_contents
,
3402 doc
: /* Insert contents of file FILENAME after point.
3403 Returns list of absolute file name and number of characters inserted.
3404 If second argument VISIT is non-nil, the buffer's visited filename and
3405 last save file modtime are set, and it is marked unmodified. If
3406 visiting and the file does not exist, visiting is completed before the
3409 The optional third and fourth arguments BEG and END specify what portion
3410 of the file to insert. These arguments count bytes in the file, not
3411 characters in the buffer. If VISIT is non-nil, BEG and END must be nil.
3413 If optional fifth argument REPLACE is non-nil, replace the current
3414 buffer contents (in the accessible portion) with the file contents.
3415 This is better than simply deleting and inserting the whole thing
3416 because (1) it preserves some marker positions and (2) it puts less data
3417 in the undo list. When REPLACE is non-nil, the second return value is
3418 the number of characters that replace previous buffer contents.
3420 This function does code conversion according to the value of
3421 `coding-system-for-read' or `file-coding-system-alist', and sets the
3422 variable `last-coding-system-used' to the coding system actually used.
3424 In addition, this function decodes the inserted text from known formats
3425 by calling `format-decode', which see. */)
3426 (Lisp_Object filename
, Lisp_Object visit
, Lisp_Object beg
, Lisp_Object end
, Lisp_Object replace
)
3429 struct timespec mtime
;
3431 ptrdiff_t inserted
= 0;
3433 off_t beg_offset
, end_offset
;
3435 ptrdiff_t count
= SPECPDL_INDEX ();
3436 Lisp_Object handler
, val
, insval
, orig_filename
, old_undo
;
3438 ptrdiff_t total
= 0;
3439 bool not_regular
= 0;
3441 char read_buf
[READ_BUF_SIZE
];
3442 struct coding_system coding
;
3443 bool replace_handled
= false;
3444 bool set_coding_system
= false;
3445 Lisp_Object coding_system
;
3446 bool read_quit
= false;
3447 /* If the undo log only contains the insertion, there's no point
3448 keeping it. It's typically when we first fill a file-buffer. */
3449 bool empty_undo_list_p
3450 = (!NILP (visit
) && NILP (BVAR (current_buffer
, undo_list
))
3452 Lisp_Object old_Vdeactivate_mark
= Vdeactivate_mark
;
3453 bool we_locked_file
= false;
3455 Lisp_Object window_markers
= Qnil
;
3456 /* same_at_start and same_at_end count bytes, because file access counts
3457 bytes and BEG and END count bytes. */
3458 ptrdiff_t same_at_start
= BEGV_BYTE
;
3459 ptrdiff_t same_at_end
= ZV_BYTE
;
3460 /* SAME_AT_END_CHARPOS counts characters, because
3461 restore_window_points needs the old character count. */
3462 ptrdiff_t same_at_end_charpos
= ZV
;
3464 if (current_buffer
->base_buffer
&& ! NILP (visit
))
3465 error ("Cannot do file visiting in an indirect buffer");
3467 if (!NILP (BVAR (current_buffer
, read_only
)))
3468 Fbarf_if_buffer_read_only (Qnil
);
3472 orig_filename
= Qnil
;
3475 CHECK_STRING (filename
);
3476 filename
= Fexpand_file_name (filename
, Qnil
);
3478 /* The value Qnil means that the coding system is not yet
3480 coding_system
= Qnil
;
3482 /* If the file name has special constructs in it,
3483 call the corresponding file handler. */
3484 handler
= Ffind_file_name_handler (filename
, Qinsert_file_contents
);
3485 if (!NILP (handler
))
3487 val
= call6 (handler
, Qinsert_file_contents
, filename
,
3488 visit
, beg
, end
, replace
);
3489 if (CONSP (val
) && CONSP (XCDR (val
))
3490 && RANGED_INTEGERP (0, XCAR (XCDR (val
)), ZV
- PT
))
3491 inserted
= XINT (XCAR (XCDR (val
)));
3495 orig_filename
= filename
;
3496 filename
= ENCODE_FILE (filename
);
3498 fd
= emacs_open (SSDATA (filename
), O_RDONLY
, 0);
3503 report_file_error ("Opening input file", orig_filename
);
3504 mtime
= time_error_value (save_errno
);
3506 if (!NILP (Vcoding_system_for_read
))
3508 /* Don't let invalid values into buffer-file-coding-system. */
3509 CHECK_CODING_SYSTEM (Vcoding_system_for_read
);
3510 Fset (Qbuffer_file_coding_system
, Vcoding_system_for_read
);
3515 fd_index
= SPECPDL_INDEX ();
3516 record_unwind_protect_int (close_file_unwind
, fd
);
3518 /* Replacement should preserve point as it preserves markers. */
3519 if (!NILP (replace
))
3521 window_markers
= get_window_points_and_markers ();
3522 record_unwind_protect (restore_point_unwind
,
3523 XCAR (XCAR (window_markers
)));
3526 if (fstat (fd
, &st
) != 0)
3527 report_file_error ("Input file status", orig_filename
);
3528 mtime
= get_stat_mtime (&st
);
3530 /* This code will need to be changed in order to work on named
3531 pipes, and it's probably just not worth it. So we should at
3532 least signal an error. */
3533 if (!S_ISREG (st
.st_mode
))
3540 if (! NILP (replace
) || ! NILP (beg
) || ! NILP (end
))
3541 xsignal2 (Qfile_error
,
3542 build_string ("not a regular file"), orig_filename
);
3547 if (!NILP (beg
) || !NILP (end
))
3548 error ("Attempt to visit less than an entire file");
3549 if (BEG
< Z
&& NILP (replace
))
3550 error ("Cannot do file visiting in a non-empty buffer");
3554 beg_offset
= file_offset (beg
);
3559 end_offset
= file_offset (end
);
3563 end_offset
= TYPE_MAXIMUM (off_t
);
3566 end_offset
= st
.st_size
;
3568 /* A negative size can happen on a platform that allows file
3569 sizes greater than the maximum off_t value. */
3573 /* The file size returned from stat may be zero, but data
3574 may be readable nonetheless, for example when this is a
3575 file in the /proc filesystem. */
3576 if (end_offset
== 0)
3577 end_offset
= READ_BUF_SIZE
;
3581 /* Check now whether the buffer will become too large,
3582 in the likely case where the file's length is not changing.
3583 This saves a lot of needless work before a buffer overflow. */
3586 /* The likely offset where we will stop reading. We could read
3587 more (or less), if the file grows (or shrinks) as we read it. */
3588 off_t likely_end
= min (end_offset
, st
.st_size
);
3590 if (beg_offset
< likely_end
)
3593 = Z_BYTE
- (!NILP (replace
) ? ZV_BYTE
- BEGV_BYTE
: 0);
3594 ptrdiff_t buf_growth_max
= BUF_BYTES_MAX
- buf_bytes
;
3595 off_t likely_growth
= likely_end
- beg_offset
;
3596 if (buf_growth_max
< likely_growth
)
3601 /* Prevent redisplay optimizations. */
3602 current_buffer
->clip_changed
= true;
3604 if (EQ (Vcoding_system_for_read
, Qauto_save_coding
))
3606 coding_system
= coding_inherit_eol_type (Qutf_8_emacs
, Qunix
);
3607 setup_coding_system (coding_system
, &coding
);
3608 /* Ensure we set Vlast_coding_system_used. */
3609 set_coding_system
= true;
3613 /* Decide the coding system to use for reading the file now
3614 because we can't use an optimized method for handling
3615 `coding:' tag if the current buffer is not empty. */
3616 if (!NILP (Vcoding_system_for_read
))
3617 coding_system
= Vcoding_system_for_read
;
3620 /* Don't try looking inside a file for a coding system
3621 specification if it is not seekable. */
3622 if (! not_regular
&& ! NILP (Vset_auto_coding_function
))
3624 /* Find a coding system specified in the heading two
3625 lines or in the tailing several lines of the file.
3626 We assume that the 1K-byte and 3K-byte for heading
3627 and tailing respectively are sufficient for this
3631 if (st
.st_size
<= (1024 * 4))
3632 nread
= emacs_read (fd
, read_buf
, 1024 * 4);
3635 nread
= emacs_read (fd
, read_buf
, 1024);
3639 if (lseek (fd
, - (1024 * 3), SEEK_END
) < 0)
3640 report_file_error ("Setting file position",
3642 ntail
= emacs_read (fd
, read_buf
+ nread
, 1024 * 3);
3643 nread
= ntail
< 0 ? ntail
: nread
+ ntail
;
3648 report_file_error ("Read error", orig_filename
);
3651 AUTO_STRING (name
, " *code-converting-work*");
3652 struct buffer
*prev
= current_buffer
;
3653 Lisp_Object workbuf
;
3656 record_unwind_current_buffer ();
3658 workbuf
= Fget_buffer_create (name
);
3659 buf
= XBUFFER (workbuf
);
3661 delete_all_overlays (buf
);
3662 bset_directory (buf
, BVAR (current_buffer
, directory
));
3663 bset_read_only (buf
, Qnil
);
3664 bset_filename (buf
, Qnil
);
3665 bset_undo_list (buf
, Qt
);
3666 eassert (buf
->overlays_before
== NULL
);
3667 eassert (buf
->overlays_after
== NULL
);
3669 set_buffer_internal (buf
);
3671 bset_enable_multibyte_characters (buf
, Qnil
);
3673 insert_1_both ((char *) read_buf
, nread
, nread
, 0, 0, 0);
3674 TEMP_SET_PT_BOTH (BEG
, BEG_BYTE
);
3675 coding_system
= call2 (Vset_auto_coding_function
,
3676 filename
, make_number (nread
));
3677 set_buffer_internal (prev
);
3679 /* Discard the unwind protect for recovering the
3683 /* Rewind the file for the actual read done later. */
3684 if (lseek (fd
, 0, SEEK_SET
) < 0)
3685 report_file_error ("Setting file position", orig_filename
);
3689 if (NILP (coding_system
))
3691 /* If we have not yet decided a coding system, check
3692 file-coding-system-alist. */
3693 coding_system
= CALLN (Ffind_operation_coding_system
,
3694 Qinsert_file_contents
, orig_filename
,
3695 visit
, beg
, end
, replace
);
3696 if (CONSP (coding_system
))
3697 coding_system
= XCAR (coding_system
);
3701 if (NILP (coding_system
))
3702 coding_system
= Qundecided
;
3704 CHECK_CODING_SYSTEM (coding_system
);
3706 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
3707 /* We must suppress all character code conversion except for
3708 end-of-line conversion. */
3709 coding_system
= raw_text_coding_system (coding_system
);
3711 setup_coding_system (coding_system
, &coding
);
3712 /* Ensure we set Vlast_coding_system_used. */
3713 set_coding_system
= true;
3716 /* If requested, replace the accessible part of the buffer
3717 with the file contents. Avoid replacing text at the
3718 beginning or end of the buffer that matches the file contents;
3719 that preserves markers pointing to the unchanged parts.
3721 Here we implement this feature in an optimized way
3722 for the case where code conversion is NOT needed.
3723 The following if-statement handles the case of conversion
3724 in a less optimal way.
3726 If the code conversion is "automatic" then we try using this
3727 method and hope for the best.
3728 But if we discover the need for conversion, we give up on this method
3729 and let the following if-statement handle the replace job. */
3732 && (NILP (coding_system
)
3733 || ! CODING_REQUIRE_DECODING (&coding
)))
3736 /* There is still a possibility we will find the need to do code
3737 conversion. If that happens, set this variable to
3738 give up on handling REPLACE in the optimized way. */
3739 bool giveup_match_end
= false;
3741 if (beg_offset
!= 0)
3743 if (lseek (fd
, beg_offset
, SEEK_SET
) < 0)
3744 report_file_error ("Setting file position", orig_filename
);
3749 /* Count how many chars at the start of the file
3750 match the text at the beginning of the buffer. */
3755 nread
= emacs_read (fd
, read_buf
, sizeof read_buf
);
3757 report_file_error ("Read error", orig_filename
);
3758 else if (nread
== 0)
3761 if (CODING_REQUIRE_DETECTION (&coding
))
3763 coding_system
= detect_coding_system ((unsigned char *) read_buf
,
3766 setup_coding_system (coding_system
, &coding
);
3769 if (CODING_REQUIRE_DECODING (&coding
))
3770 /* We found that the file should be decoded somehow.
3771 Let's give up here. */
3773 giveup_match_end
= true;
3778 while (bufpos
< nread
&& same_at_start
< ZV_BYTE
3779 && FETCH_BYTE (same_at_start
) == read_buf
[bufpos
])
3780 same_at_start
++, bufpos
++;
3781 /* If we found a discrepancy, stop the scan.
3782 Otherwise loop around and scan the next bufferful. */
3783 if (bufpos
!= nread
)
3786 immediate_quit
= false;
3787 /* If the file matches the buffer completely,
3788 there's no need to replace anything. */
3789 if (same_at_start
- BEGV_BYTE
== end_offset
- beg_offset
)
3792 clear_unwind_protect (fd_index
);
3794 /* Truncate the buffer to the size of the file. */
3795 del_range_1 (same_at_start
, same_at_end
, 0, 0);
3798 immediate_quit
= true;
3800 /* Count how many chars at the end of the file
3801 match the text at the end of the buffer. But, if we have
3802 already found that decoding is necessary, don't waste time. */
3803 while (!giveup_match_end
)
3805 int total_read
, nread
, bufpos
, trial
;
3808 /* At what file position are we now scanning? */
3809 curpos
= end_offset
- (ZV_BYTE
- same_at_end
);
3810 /* If the entire file matches the buffer tail, stop the scan. */
3813 /* How much can we scan in the next step? */
3814 trial
= min (curpos
, sizeof read_buf
);
3815 if (lseek (fd
, curpos
- trial
, SEEK_SET
) < 0)
3816 report_file_error ("Setting file position", orig_filename
);
3818 total_read
= nread
= 0;
3819 while (total_read
< trial
)
3821 nread
= emacs_read (fd
, read_buf
+ total_read
, trial
- total_read
);
3823 report_file_error ("Read error", orig_filename
);
3824 else if (nread
== 0)
3826 total_read
+= nread
;
3829 /* Scan this bufferful from the end, comparing with
3830 the Emacs buffer. */
3831 bufpos
= total_read
;
3833 /* Compare with same_at_start to avoid counting some buffer text
3834 as matching both at the file's beginning and at the end. */
3835 while (bufpos
> 0 && same_at_end
> same_at_start
3836 && FETCH_BYTE (same_at_end
- 1) == read_buf
[bufpos
- 1])
3837 same_at_end
--, bufpos
--;
3839 /* If we found a discrepancy, stop the scan.
3840 Otherwise loop around and scan the preceding bufferful. */
3843 /* If this discrepancy is because of code conversion,
3844 we cannot use this method; giveup and try the other. */
3845 if (same_at_end
> same_at_start
3846 && FETCH_BYTE (same_at_end
- 1) >= 0200
3847 && ! NILP (BVAR (current_buffer
, enable_multibyte_characters
))
3848 && (CODING_MAY_REQUIRE_DECODING (&coding
)))
3849 giveup_match_end
= true;
3858 if (! giveup_match_end
)
3862 /* We win! We can handle REPLACE the optimized way. */
3864 /* Extend the start of non-matching text area to multibyte
3865 character boundary. */
3866 if (! NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
3867 while (same_at_start
> BEGV_BYTE
3868 && ! CHAR_HEAD_P (FETCH_BYTE (same_at_start
)))
3871 /* Extend the end of non-matching text area to multibyte
3872 character boundary. */
3873 if (! NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
3874 while (same_at_end
< ZV_BYTE
3875 && ! CHAR_HEAD_P (FETCH_BYTE (same_at_end
)))
3878 /* Don't try to reuse the same piece of text twice. */
3879 overlap
= (same_at_start
- BEGV_BYTE
3881 + (! NILP (end
) ? end_offset
: st
.st_size
) - ZV_BYTE
));
3883 same_at_end
+= overlap
;
3884 same_at_end_charpos
= BYTE_TO_CHAR (same_at_end
);
3886 /* Arrange to read only the nonmatching middle part of the file. */
3887 beg_offset
+= same_at_start
- BEGV_BYTE
;
3888 end_offset
-= ZV_BYTE
- same_at_end
;
3890 invalidate_buffer_caches (current_buffer
,
3891 BYTE_TO_CHAR (same_at_start
),
3892 same_at_end_charpos
);
3893 del_range_byte (same_at_start
, same_at_end
, 0);
3894 /* Insert from the file at the proper position. */
3895 temp
= BYTE_TO_CHAR (same_at_start
);
3896 SET_PT_BOTH (temp
, same_at_start
);
3898 /* If display currently starts at beginning of line,
3899 keep it that way. */
3900 if (XBUFFER (XWINDOW (selected_window
)->contents
) == current_buffer
)
3901 XWINDOW (selected_window
)->start_at_line_beg
= !NILP (Fbolp ());
3903 replace_handled
= true;
3907 /* If requested, replace the accessible part of the buffer
3908 with the file contents. Avoid replacing text at the
3909 beginning or end of the buffer that matches the file contents;
3910 that preserves markers pointing to the unchanged parts.
3912 Here we implement this feature for the case where code conversion
3913 is needed, in a simple way that needs a lot of memory.
3914 The preceding if-statement handles the case of no conversion
3915 in a more optimized way. */
3916 if (!NILP (replace
) && ! replace_handled
&& BEGV
< ZV
)
3918 ptrdiff_t same_at_start_charpos
;
3919 ptrdiff_t inserted_chars
;
3922 unsigned char *decoded
;
3925 ptrdiff_t this_count
= SPECPDL_INDEX ();
3927 = ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
3928 Lisp_Object conversion_buffer
;
3930 conversion_buffer
= code_conversion_save (1, multibyte
);
3932 /* First read the whole file, performing code conversion into
3933 CONVERSION_BUFFER. */
3935 if (lseek (fd
, beg_offset
, SEEK_SET
) < 0)
3936 report_file_error ("Setting file position", orig_filename
);
3938 inserted
= 0; /* Bytes put into CONVERSION_BUFFER so far. */
3939 unprocessed
= 0; /* Bytes not processed in previous loop. */
3943 /* Read at most READ_BUF_SIZE bytes at a time, to allow
3944 quitting while reading a huge file. */
3946 /* Allow quitting out of the actual I/O. */
3949 this = emacs_read (fd
, read_buf
+ unprocessed
,
3950 READ_BUF_SIZE
- unprocessed
);
3956 BUF_TEMP_SET_PT (XBUFFER (conversion_buffer
),
3957 BUF_Z (XBUFFER (conversion_buffer
)));
3958 decode_coding_c_string (&coding
, (unsigned char *) read_buf
,
3959 unprocessed
+ this, conversion_buffer
);
3960 unprocessed
= coding
.carryover_bytes
;
3961 if (coding
.carryover_bytes
> 0)
3962 memcpy (read_buf
, coding
.carryover
, unprocessed
);
3966 report_file_error ("Read error", orig_filename
);
3968 clear_unwind_protect (fd_index
);
3970 if (unprocessed
> 0)
3972 coding
.mode
|= CODING_MODE_LAST_BLOCK
;
3973 decode_coding_c_string (&coding
, (unsigned char *) read_buf
,
3974 unprocessed
, conversion_buffer
);
3975 coding
.mode
&= ~CODING_MODE_LAST_BLOCK
;
3978 coding_system
= CODING_ID_NAME (coding
.id
);
3979 set_coding_system
= true;
3980 maybe_move_gap (XBUFFER (conversion_buffer
));
3981 decoded
= BUF_BEG_ADDR (XBUFFER (conversion_buffer
));
3982 inserted
= (BUF_Z_BYTE (XBUFFER (conversion_buffer
))
3983 - BUF_BEG_BYTE (XBUFFER (conversion_buffer
)));
3985 /* Compare the beginning of the converted string with the buffer
3989 while (bufpos
< inserted
&& same_at_start
< same_at_end
3990 && FETCH_BYTE (same_at_start
) == decoded
[bufpos
])
3991 same_at_start
++, bufpos
++;
3993 /* If the file matches the head of buffer completely,
3994 there's no need to replace anything. */
3996 if (bufpos
== inserted
)
3998 /* Truncate the buffer to the size of the file. */
3999 if (same_at_start
!= same_at_end
)
4001 invalidate_buffer_caches (current_buffer
,
4002 BYTE_TO_CHAR (same_at_start
),
4003 BYTE_TO_CHAR (same_at_end
));
4004 del_range_byte (same_at_start
, same_at_end
, 0);
4008 unbind_to (this_count
, Qnil
);
4012 /* Extend the start of non-matching text area to the previous
4013 multibyte character boundary. */
4014 if (! NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
4015 while (same_at_start
> BEGV_BYTE
4016 && ! CHAR_HEAD_P (FETCH_BYTE (same_at_start
)))
4019 /* Scan this bufferful from the end, comparing with
4020 the Emacs buffer. */
4023 /* Compare with same_at_start to avoid counting some buffer text
4024 as matching both at the file's beginning and at the end. */
4025 while (bufpos
> 0 && same_at_end
> same_at_start
4026 && FETCH_BYTE (same_at_end
- 1) == decoded
[bufpos
- 1])
4027 same_at_end
--, bufpos
--;
4029 /* Extend the end of non-matching text area to the next
4030 multibyte character boundary. */
4031 if (! NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
4032 while (same_at_end
< ZV_BYTE
4033 && ! CHAR_HEAD_P (FETCH_BYTE (same_at_end
)))
4036 /* Don't try to reuse the same piece of text twice. */
4037 overlap
= same_at_start
- BEGV_BYTE
- (same_at_end
+ inserted
- ZV_BYTE
);
4039 same_at_end
+= overlap
;
4040 same_at_end_charpos
= BYTE_TO_CHAR (same_at_end
);
4042 /* If display currently starts at beginning of line,
4043 keep it that way. */
4044 if (XBUFFER (XWINDOW (selected_window
)->contents
) == current_buffer
)
4045 XWINDOW (selected_window
)->start_at_line_beg
= !NILP (Fbolp ());
4047 /* Replace the chars that we need to replace,
4048 and update INSERTED to equal the number of bytes
4049 we are taking from the decoded string. */
4050 inserted
-= (ZV_BYTE
- same_at_end
) + (same_at_start
- BEGV_BYTE
);
4052 if (same_at_end
!= same_at_start
)
4054 invalidate_buffer_caches (current_buffer
,
4055 BYTE_TO_CHAR (same_at_start
),
4056 same_at_end_charpos
);
4057 del_range_byte (same_at_start
, same_at_end
, 0);
4059 eassert (same_at_start
== GPT_BYTE
);
4060 same_at_start
= GPT_BYTE
;
4064 temp
= same_at_end_charpos
;
4066 /* Insert from the file at the proper position. */
4067 SET_PT_BOTH (temp
, same_at_start
);
4068 same_at_start_charpos
4069 = buf_bytepos_to_charpos (XBUFFER (conversion_buffer
),
4070 same_at_start
- BEGV_BYTE
4071 + BUF_BEG_BYTE (XBUFFER (conversion_buffer
)));
4072 eassert (same_at_start_charpos
== temp
- (BEGV
- BEG
));
4074 = (buf_bytepos_to_charpos (XBUFFER (conversion_buffer
),
4075 same_at_start
+ inserted
- BEGV_BYTE
4076 + BUF_BEG_BYTE (XBUFFER (conversion_buffer
)))
4077 - same_at_start_charpos
);
4078 /* This binding is to avoid ask-user-about-supersession-threat
4079 being called in insert_from_buffer (via in
4080 prepare_to_modify_buffer). */
4081 specbind (intern ("buffer-file-name"), Qnil
);
4082 insert_from_buffer (XBUFFER (conversion_buffer
),
4083 same_at_start_charpos
, inserted_chars
, 0);
4084 /* Set `inserted' to the number of inserted characters. */
4085 inserted
= PT
- temp
;
4086 /* Set point before the inserted characters. */
4087 SET_PT_BOTH (temp
, same_at_start
);
4089 unbind_to (this_count
, Qnil
);
4095 total
= end_offset
- beg_offset
;
4097 /* For a special file, all we can do is guess. */
4098 total
= READ_BUF_SIZE
;
4100 if (NILP (visit
) && total
> 0)
4102 if (!NILP (BVAR (current_buffer
, file_truename
))
4103 /* Make binding buffer-file-name to nil effective. */
4104 && !NILP (BVAR (current_buffer
, filename
))
4105 && SAVE_MODIFF
>= MODIFF
)
4106 we_locked_file
= true;
4107 prepare_to_modify_buffer (PT
, PT
, NULL
);
4110 move_gap_both (PT
, PT_BYTE
);
4111 if (GAP_SIZE
< total
)
4112 make_gap (total
- GAP_SIZE
);
4114 if (beg_offset
!= 0 || !NILP (replace
))
4116 if (lseek (fd
, beg_offset
, SEEK_SET
) < 0)
4117 report_file_error ("Setting file position", orig_filename
);
4120 /* In the following loop, HOW_MUCH contains the total bytes read so
4121 far for a regular file, and not changed for a special file. But,
4122 before exiting the loop, it is set to a negative value if I/O
4126 /* Total bytes inserted. */
4129 /* Here, we don't do code conversion in the loop. It is done by
4130 decode_coding_gap after all data are read into the buffer. */
4132 ptrdiff_t gap_size
= GAP_SIZE
;
4134 while (how_much
< total
)
4136 /* `try' is reserved in some compilers (Microsoft C). */
4137 ptrdiff_t trytry
= min (total
- how_much
, READ_BUF_SIZE
);
4144 /* Maybe make more room. */
4145 if (gap_size
< trytry
)
4147 make_gap (trytry
- gap_size
);
4148 gap_size
= GAP_SIZE
- inserted
;
4151 /* Read from the file, capturing `quit'. When an
4152 error occurs, end the loop, and arrange for a quit
4153 to be signaled after decoding the text we read. */
4154 nbytes
= internal_condition_case_1
4156 make_save_int_int_int (fd
, inserted
, trytry
),
4157 Qerror
, read_non_regular_quit
);
4165 this = XINT (nbytes
);
4169 /* Allow quitting out of the actual I/O. We don't make text
4170 part of the buffer until all the reading is done, so a C-g
4171 here doesn't do any harm. */
4174 this = emacs_read (fd
,
4175 ((char *) BEG_ADDR
+ PT_BYTE
- BEG_BYTE
4189 /* For a regular file, where TOTAL is the real size,
4190 count HOW_MUCH to compare with it.
4191 For a special file, where TOTAL is just a buffer size,
4192 so don't bother counting in HOW_MUCH.
4193 (INSERTED is where we count the number of characters inserted.) */
4200 /* Now we have either read all the file data into the gap,
4201 or stop reading on I/O error or quit. If nothing was
4202 read, undo marking the buffer modified. */
4207 unlock_file (BVAR (current_buffer
, file_truename
));
4208 Vdeactivate_mark
= old_Vdeactivate_mark
;
4211 Fset (Qdeactivate_mark
, Qt
);
4214 clear_unwind_protect (fd_index
);
4217 report_file_error ("Read error", orig_filename
);
4219 /* Make the text read part of the buffer. */
4220 GAP_SIZE
-= inserted
;
4222 GPT_BYTE
+= inserted
;
4224 ZV_BYTE
+= inserted
;
4229 /* Put an anchor to ensure multi-byte form ends at gap. */
4234 if (NILP (coding_system
))
4236 /* The coding system is not yet decided. Decide it by an
4237 optimized method for handling `coding:' tag.
4239 Note that we can get here only if the buffer was empty
4240 before the insertion. */
4242 if (!NILP (Vcoding_system_for_read
))
4243 coding_system
= Vcoding_system_for_read
;
4246 /* Since we are sure that the current buffer was empty
4247 before the insertion, we can toggle
4248 enable-multibyte-characters directly here without taking
4249 care of marker adjustment. By this way, we can run Lisp
4250 program safely before decoding the inserted text. */
4251 Lisp_Object unwind_data
;
4252 ptrdiff_t count1
= SPECPDL_INDEX ();
4254 unwind_data
= Fcons (BVAR (current_buffer
, enable_multibyte_characters
),
4255 Fcons (BVAR (current_buffer
, undo_list
),
4256 Fcurrent_buffer ()));
4257 bset_enable_multibyte_characters (current_buffer
, Qnil
);
4258 bset_undo_list (current_buffer
, Qt
);
4259 record_unwind_protect (decide_coding_unwind
, unwind_data
);
4261 if (inserted
> 0 && ! NILP (Vset_auto_coding_function
))
4263 coding_system
= call2 (Vset_auto_coding_function
,
4264 filename
, make_number (inserted
));
4267 if (NILP (coding_system
))
4269 /* If the coding system is not yet decided, check
4270 file-coding-system-alist. */
4271 coding_system
= CALLN (Ffind_operation_coding_system
,
4272 Qinsert_file_contents
, orig_filename
,
4273 visit
, beg
, end
, Qnil
);
4274 if (CONSP (coding_system
))
4275 coding_system
= XCAR (coding_system
);
4277 unbind_to (count1
, Qnil
);
4278 inserted
= Z_BYTE
- BEG_BYTE
;
4281 if (NILP (coding_system
))
4282 coding_system
= Qundecided
;
4284 CHECK_CODING_SYSTEM (coding_system
);
4286 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
4287 /* We must suppress all character code conversion except for
4288 end-of-line conversion. */
4289 coding_system
= raw_text_coding_system (coding_system
);
4290 setup_coding_system (coding_system
, &coding
);
4291 /* Ensure we set Vlast_coding_system_used. */
4292 set_coding_system
= true;
4297 /* When we visit a file by raw-text, we change the buffer to
4299 if (CODING_FOR_UNIBYTE (&coding
)
4300 /* Can't do this if part of the buffer might be preserved. */
4303 /* Visiting a file with these coding system makes the buffer
4306 bset_enable_multibyte_characters (current_buffer
, Qnil
);
4308 Fset_buffer_multibyte (Qnil
);
4312 coding
.dst_multibyte
= ! NILP (BVAR (current_buffer
, enable_multibyte_characters
));
4313 if (CODING_MAY_REQUIRE_DECODING (&coding
)
4314 && (inserted
> 0 || CODING_REQUIRE_FLUSHING (&coding
)))
4316 move_gap_both (PT
, PT_BYTE
);
4317 GAP_SIZE
+= inserted
;
4318 ZV_BYTE
-= inserted
;
4322 decode_coding_gap (&coding
, inserted
, inserted
);
4323 inserted
= coding
.produced_char
;
4324 coding_system
= CODING_ID_NAME (coding
.id
);
4326 else if (inserted
> 0)
4328 invalidate_buffer_caches (current_buffer
, PT
, PT
+ inserted
);
4329 adjust_after_insert (PT
, PT_BYTE
, PT
+ inserted
, PT_BYTE
+ inserted
,
4333 /* Call after-change hooks for the inserted text, aside from the case
4334 of normal visiting (not with REPLACE), which is done in a new buffer
4335 "before" the buffer is changed. */
4336 if (inserted
> 0 && total
> 0
4337 && (NILP (visit
) || !NILP (replace
)))
4339 signal_after_change (PT
, 0, inserted
);
4340 update_compositions (PT
, PT
, CHECK_BORDER
);
4343 /* Now INSERTED is measured in characters. */
4348 restore_window_points (window_markers
, inserted
,
4349 BYTE_TO_CHAR (same_at_start
),
4350 same_at_end_charpos
);
4354 if (empty_undo_list_p
)
4355 bset_undo_list (current_buffer
, Qnil
);
4359 current_buffer
->modtime
= mtime
;
4360 current_buffer
->modtime_size
= st
.st_size
;
4361 bset_filename (current_buffer
, orig_filename
);
4364 SAVE_MODIFF
= MODIFF
;
4365 BUF_AUTOSAVE_MODIFF (current_buffer
) = MODIFF
;
4366 XSETFASTINT (BVAR (current_buffer
, save_length
), Z
- BEG
);
4369 if (!NILP (BVAR (current_buffer
, file_truename
)))
4370 unlock_file (BVAR (current_buffer
, file_truename
));
4371 unlock_file (filename
);
4374 xsignal2 (Qfile_error
,
4375 build_string ("not a regular file"), orig_filename
);
4378 if (set_coding_system
)
4379 Vlast_coding_system_used
= coding_system
;
4381 if (! NILP (Ffboundp (Qafter_insert_file_set_coding
)))
4383 insval
= call2 (Qafter_insert_file_set_coding
, make_number (inserted
),
4385 if (! NILP (insval
))
4387 if (! RANGED_INTEGERP (0, insval
, ZV
- PT
))
4388 wrong_type_argument (intern ("inserted-chars"), insval
);
4389 inserted
= XFASTINT (insval
);
4393 /* Decode file format. */
4396 /* Don't run point motion or modification hooks when decoding. */
4397 ptrdiff_t count1
= SPECPDL_INDEX ();
4398 ptrdiff_t old_inserted
= inserted
;
4399 specbind (Qinhibit_point_motion_hooks
, Qt
);
4400 specbind (Qinhibit_modification_hooks
, Qt
);
4402 /* Save old undo list and don't record undo for decoding. */
4403 old_undo
= BVAR (current_buffer
, undo_list
);
4404 bset_undo_list (current_buffer
, Qt
);
4408 insval
= call3 (Qformat_decode
,
4409 Qnil
, make_number (inserted
), visit
);
4410 if (! RANGED_INTEGERP (0, insval
, ZV
- PT
))
4411 wrong_type_argument (intern ("inserted-chars"), insval
);
4412 inserted
= XFASTINT (insval
);
4416 /* If REPLACE is non-nil and we succeeded in not replacing the
4417 beginning or end of the buffer text with the file's contents,
4418 call format-decode with `point' positioned at the beginning
4419 of the buffer and `inserted' equaling the number of
4420 characters in the buffer. Otherwise, format-decode might
4421 fail to correctly analyze the beginning or end of the buffer.
4422 Hence we temporarily save `point' and `inserted' here and
4423 restore `point' iff format-decode did not insert or delete
4424 any text. Otherwise we leave `point' at point-min. */
4425 ptrdiff_t opoint
= PT
;
4426 ptrdiff_t opoint_byte
= PT_BYTE
;
4427 ptrdiff_t oinserted
= ZV
- BEGV
;
4428 EMACS_INT ochars_modiff
= CHARS_MODIFF
;
4430 TEMP_SET_PT_BOTH (BEGV
, BEGV_BYTE
);
4431 insval
= call3 (Qformat_decode
,
4432 Qnil
, make_number (oinserted
), visit
);
4433 if (! RANGED_INTEGERP (0, insval
, ZV
- PT
))
4434 wrong_type_argument (intern ("inserted-chars"), insval
);
4435 if (ochars_modiff
== CHARS_MODIFF
)
4436 /* format_decode didn't modify buffer's characters => move
4437 point back to position before inserted text and leave
4438 value of inserted alone. */
4439 SET_PT_BOTH (opoint
, opoint_byte
);
4441 /* format_decode modified buffer's characters => consider
4442 entire buffer changed and leave point at point-min. */
4443 inserted
= XFASTINT (insval
);
4446 /* For consistency with format-decode call these now iff inserted > 0
4447 (martin 2007-06-28). */
4448 p
= Vafter_insert_file_functions
;
4453 insval
= call1 (XCAR (p
), make_number (inserted
));
4456 if (! RANGED_INTEGERP (0, insval
, ZV
- PT
))
4457 wrong_type_argument (intern ("inserted-chars"), insval
);
4458 inserted
= XFASTINT (insval
);
4463 /* For the rationale of this see the comment on
4464 format-decode above. */
4465 ptrdiff_t opoint
= PT
;
4466 ptrdiff_t opoint_byte
= PT_BYTE
;
4467 ptrdiff_t oinserted
= ZV
- BEGV
;
4468 EMACS_INT ochars_modiff
= CHARS_MODIFF
;
4470 TEMP_SET_PT_BOTH (BEGV
, BEGV_BYTE
);
4471 insval
= call1 (XCAR (p
), make_number (oinserted
));
4474 if (! RANGED_INTEGERP (0, insval
, ZV
- PT
))
4475 wrong_type_argument (intern ("inserted-chars"), insval
);
4476 if (ochars_modiff
== CHARS_MODIFF
)
4477 /* after_insert_file_functions didn't modify
4478 buffer's characters => move point back to
4479 position before inserted text and leave value of
4481 SET_PT_BOTH (opoint
, opoint_byte
);
4483 /* after_insert_file_functions did modify buffer's
4484 characters => consider entire buffer changed and
4485 leave point at point-min. */
4486 inserted
= XFASTINT (insval
);
4494 if (!empty_undo_list_p
)
4496 bset_undo_list (current_buffer
, old_undo
);
4497 if (CONSP (old_undo
) && inserted
!= old_inserted
)
4499 /* Adjust the last undo record for the size change during
4500 the format conversion. */
4501 Lisp_Object tem
= XCAR (old_undo
);
4502 if (CONSP (tem
) && INTEGERP (XCAR (tem
))
4503 && INTEGERP (XCDR (tem
))
4504 && XFASTINT (XCDR (tem
)) == PT
+ old_inserted
)
4505 XSETCDR (tem
, make_number (PT
+ inserted
));
4509 /* If undo_list was Qt before, keep it that way.
4510 Otherwise start with an empty undo_list. */
4511 bset_undo_list (current_buffer
, EQ (old_undo
, Qt
) ? Qt
: Qnil
);
4513 unbind_to (count1
, Qnil
);
4517 && current_buffer
->modtime
.tv_nsec
== NONEXISTENT_MODTIME_NSECS
)
4519 /* If visiting nonexistent file, return nil. */
4520 report_file_errno ("Opening input file", orig_filename
, save_errno
);
4523 /* We made a lot of deletions and insertions above, so invalidate
4524 the newline cache for the entire region of the inserted
4526 if (current_buffer
->base_buffer
&& current_buffer
->base_buffer
->newline_cache
)
4527 invalidate_region_cache (current_buffer
->base_buffer
,
4528 current_buffer
->base_buffer
->newline_cache
,
4529 PT
- BEG
, Z
- PT
- inserted
);
4530 else if (current_buffer
->newline_cache
)
4531 invalidate_region_cache (current_buffer
,
4532 current_buffer
->newline_cache
,
4533 PT
- BEG
, Z
- PT
- inserted
);
4538 /* Retval needs to be dealt with in all cases consistently. */
4540 val
= list2 (orig_filename
, make_number (inserted
));
4542 return unbind_to (count
, val
);
4545 static Lisp_Object
build_annotations (Lisp_Object
, Lisp_Object
);
4548 build_annotations_unwind (Lisp_Object arg
)
4550 Vwrite_region_annotation_buffers
= arg
;
4553 /* Decide the coding-system to encode the data with. */
4556 choose_write_coding_system (Lisp_Object start
, Lisp_Object end
, Lisp_Object filename
,
4557 Lisp_Object append
, Lisp_Object visit
, Lisp_Object lockname
,
4558 struct coding_system
*coding
)
4561 Lisp_Object eol_parent
= Qnil
;
4564 && NILP (Fstring_equal (BVAR (current_buffer
, filename
),
4565 BVAR (current_buffer
, auto_save_file_name
))))
4570 else if (!NILP (Vcoding_system_for_write
))
4572 val
= Vcoding_system_for_write
;
4573 if (coding_system_require_warning
4574 && !NILP (Ffboundp (Vselect_safe_coding_system_function
)))
4575 /* Confirm that VAL can surely encode the current region. */
4576 val
= call5 (Vselect_safe_coding_system_function
,
4577 start
, end
, list2 (Qt
, val
),
4582 /* If the variable `buffer-file-coding-system' is set locally,
4583 it means that the file was read with some kind of code
4584 conversion or the variable is explicitly set by users. We
4585 had better write it out with the same coding system even if
4586 `enable-multibyte-characters' is nil.
4588 If it is not set locally, we anyway have to convert EOL
4589 format if the default value of `buffer-file-coding-system'
4590 tells that it is not Unix-like (LF only) format. */
4591 bool using_default_coding
= 0;
4592 bool force_raw_text
= 0;
4594 val
= BVAR (current_buffer
, buffer_file_coding_system
);
4596 || NILP (Flocal_variable_p (Qbuffer_file_coding_system
, Qnil
)))
4599 if (NILP (BVAR (current_buffer
, enable_multibyte_characters
)))
4605 /* Check file-coding-system-alist. */
4606 Lisp_Object coding_systems
4607 = CALLN (Ffind_operation_coding_system
, Qwrite_region
, start
, end
,
4608 filename
, append
, visit
, lockname
);
4609 if (CONSP (coding_systems
) && !NILP (XCDR (coding_systems
)))
4610 val
= XCDR (coding_systems
);
4615 /* If we still have not decided a coding system, use the
4616 current buffer's value of buffer-file-coding-system. */
4617 val
= BVAR (current_buffer
, buffer_file_coding_system
);
4618 using_default_coding
= 1;
4621 if (! NILP (val
) && ! force_raw_text
)
4623 Lisp_Object spec
, attrs
;
4625 CHECK_CODING_SYSTEM (val
);
4626 CHECK_CODING_SYSTEM_GET_SPEC (val
, spec
);
4627 attrs
= AREF (spec
, 0);
4628 if (EQ (CODING_ATTR_TYPE (attrs
), Qraw_text
))
4633 && !NILP (Ffboundp (Vselect_safe_coding_system_function
)))
4635 /* Confirm that VAL can surely encode the current region. */
4636 val
= call5 (Vselect_safe_coding_system_function
,
4637 start
, end
, val
, Qnil
, filename
);
4638 /* As the function specified by select-safe-coding-system-function
4639 is out of our control, make sure we are not fed by bogus
4642 CHECK_CODING_SYSTEM (val
);
4645 /* If the decided coding-system doesn't specify end-of-line
4646 format, we use that of
4647 `default-buffer-file-coding-system'. */
4648 if (! using_default_coding
)
4650 Lisp_Object dflt
= BVAR (&buffer_defaults
, buffer_file_coding_system
);
4653 val
= coding_inherit_eol_type (val
, dflt
);
4656 /* If we decide not to encode text, use `raw-text' or one of its
4659 val
= raw_text_coding_system (val
);
4662 val
= coding_inherit_eol_type (val
, eol_parent
);
4663 setup_coding_system (val
, coding
);
4665 if (!STRINGP (start
) && !NILP (BVAR (current_buffer
, selective_display
)))
4666 coding
->mode
|= CODING_MODE_SELECTIVE_DISPLAY
;
4670 DEFUN ("write-region", Fwrite_region
, Swrite_region
, 3, 7,
4671 "r\nFWrite region to file: \ni\ni\ni\np",
4672 doc
: /* Write current region into specified file.
4673 When called from a program, requires three arguments:
4674 START, END and FILENAME. START and END are normally buffer positions
4675 specifying the part of the buffer to write.
4676 If START is nil, that means to use the entire buffer contents; END is
4678 If START is a string, then output that string to the file
4679 instead of any buffer contents; END is ignored.
4681 Optional fourth argument APPEND if non-nil means
4682 append to existing file contents (if any). If it is a number,
4683 seek to that offset in the file before writing.
4684 Optional fifth argument VISIT, if t or a string, means
4685 set the last-save-file-modtime of buffer to this file's modtime
4686 and mark buffer not modified.
4687 If VISIT is a string, it is a second file name;
4688 the output goes to FILENAME, but the buffer is marked as visiting VISIT.
4689 VISIT is also the file name to lock and unlock for clash detection.
4690 If VISIT is neither t nor nil nor a string, or if Emacs is in batch mode,
4691 do not display the \"Wrote file\" message.
4692 The optional sixth arg LOCKNAME, if non-nil, specifies the name to
4693 use for locking and unlocking, overriding FILENAME and VISIT.
4694 The optional seventh arg MUSTBENEW, if non-nil, insists on a check
4695 for an existing file with the same name. If MUSTBENEW is `excl',
4696 that means to get an error if the file already exists; never overwrite.
4697 If MUSTBENEW is neither nil nor `excl', that means ask for
4698 confirmation before overwriting, but do go ahead and overwrite the file
4699 if the user confirms.
4701 This does code conversion according to the value of
4702 `coding-system-for-write', `buffer-file-coding-system', or
4703 `file-coding-system-alist', and sets the variable
4704 `last-coding-system-used' to the coding system actually used.
4706 This calls `write-region-annotate-functions' at the start, and
4707 `write-region-post-annotation-function' at the end. */)
4708 (Lisp_Object start
, Lisp_Object end
, Lisp_Object filename
, Lisp_Object append
,
4709 Lisp_Object visit
, Lisp_Object lockname
, Lisp_Object mustbenew
)
4711 return write_region (start
, end
, filename
, append
, visit
, lockname
, mustbenew
,
4715 /* Like Fwrite_region, except that if DESC is nonnegative, it is a file
4716 descriptor for FILENAME, so do not open or close FILENAME. */
4719 write_region (Lisp_Object start
, Lisp_Object end
, Lisp_Object filename
,
4720 Lisp_Object append
, Lisp_Object visit
, Lisp_Object lockname
,
4721 Lisp_Object mustbenew
, int desc
)
4725 off_t offset UNINIT
;
4726 bool open_and_close_file
= desc
< 0;
4731 struct timespec modtime
;
4732 ptrdiff_t count
= SPECPDL_INDEX ();
4733 ptrdiff_t count1 UNINIT
;
4734 Lisp_Object handler
;
4735 Lisp_Object visit_file
;
4736 Lisp_Object annotations
;
4737 Lisp_Object encoded_filename
;
4738 bool visiting
= (EQ (visit
, Qt
) || STRINGP (visit
));
4739 bool quietly
= !NILP (visit
);
4740 bool file_locked
= 0;
4741 struct buffer
*given_buffer
;
4742 struct coding_system coding
;
4744 if (current_buffer
->base_buffer
&& visiting
)
4745 error ("Cannot do file visiting in an indirect buffer");
4747 if (!NILP (start
) && !STRINGP (start
))
4748 validate_region (&start
, &end
);
4752 filename
= Fexpand_file_name (filename
, Qnil
);
4754 if (!NILP (mustbenew
) && !EQ (mustbenew
, Qexcl
))
4755 barf_or_query_if_file_exists (filename
, false, "overwrite", true, true);
4757 if (STRINGP (visit
))
4758 visit_file
= Fexpand_file_name (visit
, Qnil
);
4760 visit_file
= filename
;
4762 if (NILP (lockname
))
4763 lockname
= visit_file
;
4767 /* If the file name has special constructs in it,
4768 call the corresponding file handler. */
4769 handler
= Ffind_file_name_handler (filename
, Qwrite_region
);
4770 /* If FILENAME has no handler, see if VISIT has one. */
4771 if (NILP (handler
) && STRINGP (visit
))
4772 handler
= Ffind_file_name_handler (visit
, Qwrite_region
);
4774 if (!NILP (handler
))
4777 val
= call6 (handler
, Qwrite_region
, start
, end
,
4778 filename
, append
, visit
);
4782 SAVE_MODIFF
= MODIFF
;
4783 XSETFASTINT (BVAR (current_buffer
, save_length
), Z
- BEG
);
4784 bset_filename (current_buffer
, visit_file
);
4790 record_unwind_protect (save_restriction_restore
, save_restriction_save ());
4792 /* Special kludge to simplify auto-saving. */
4795 /* Do it later, so write-region-annotate-function can work differently
4796 if we save "the buffer" vs "a region".
4797 This is useful in tar-mode. --Stef
4798 XSETFASTINT (start, BEG);
4799 XSETFASTINT (end, Z); */
4803 record_unwind_protect (build_annotations_unwind
,
4804 Vwrite_region_annotation_buffers
);
4805 Vwrite_region_annotation_buffers
= list1 (Fcurrent_buffer ());
4807 given_buffer
= current_buffer
;
4809 if (!STRINGP (start
))
4811 annotations
= build_annotations (start
, end
);
4813 if (current_buffer
!= given_buffer
)
4815 XSETFASTINT (start
, BEGV
);
4816 XSETFASTINT (end
, ZV
);
4822 XSETFASTINT (start
, BEGV
);
4823 XSETFASTINT (end
, ZV
);
4826 /* Decide the coding-system to encode the data with.
4827 We used to make this choice before calling build_annotations, but that
4828 leads to problems when a write-annotate-function takes care of
4829 unsavable chars (as was the case with X-Symbol). */
4830 Vlast_coding_system_used
4831 = choose_write_coding_system (start
, end
, filename
,
4832 append
, visit
, lockname
, &coding
);
4834 if (open_and_close_file
&& !auto_saving
)
4836 lock_file (lockname
);
4840 encoded_filename
= ENCODE_FILE (filename
);
4841 fn
= SSDATA (encoded_filename
);
4842 open_flags
= O_WRONLY
| O_CREAT
;
4843 open_flags
|= EQ (mustbenew
, Qexcl
) ? O_EXCL
: !NILP (append
) ? 0 : O_TRUNC
;
4844 if (NUMBERP (append
))
4845 offset
= file_offset (append
);
4846 else if (!NILP (append
))
4847 open_flags
|= O_APPEND
;
4849 mode
= S_IREAD
| S_IWRITE
;
4851 mode
= auto_saving
? auto_save_mode_bits
: 0666;
4854 if (open_and_close_file
)
4856 desc
= emacs_open (fn
, open_flags
, mode
);
4859 int open_errno
= errno
;
4861 unlock_file (lockname
);
4862 report_file_errno ("Opening output file", filename
, open_errno
);
4865 count1
= SPECPDL_INDEX ();
4866 record_unwind_protect_int (close_file_unwind
, desc
);
4869 if (NUMBERP (append
))
4871 off_t ret
= lseek (desc
, offset
, SEEK_SET
);
4874 int lseek_errno
= errno
;
4876 unlock_file (lockname
);
4877 report_file_errno ("Lseek error", filename
, lseek_errno
);
4883 if (STRINGP (start
))
4884 ok
= a_write (desc
, start
, 0, SCHARS (start
), &annotations
, &coding
);
4885 else if (XINT (start
) != XINT (end
))
4886 ok
= a_write (desc
, Qnil
, XINT (start
), XINT (end
) - XINT (start
),
4887 &annotations
, &coding
);
4890 /* If file was empty, still need to write the annotations. */
4891 coding
.mode
|= CODING_MODE_LAST_BLOCK
;
4892 ok
= a_write (desc
, Qnil
, XINT (end
), 0, &annotations
, &coding
);
4896 if (ok
&& CODING_REQUIRE_FLUSHING (&coding
)
4897 && !(coding
.mode
& CODING_MODE_LAST_BLOCK
))
4899 /* We have to flush out a data. */
4900 coding
.mode
|= CODING_MODE_LAST_BLOCK
;
4901 ok
= e_write (desc
, Qnil
, 1, 1, &coding
);
4907 /* fsync is not crucial for temporary files. Nor for auto-save
4908 files, since they might lose some work anyway. */
4909 if (open_and_close_file
&& !auto_saving
&& !write_region_inhibit_fsync
)
4911 /* Transfer data and metadata to disk, retrying if interrupted.
4912 fsync can report a write failure here, e.g., due to disk full
4913 under NFS. But ignore EINVAL, which means fsync is not
4914 supported on this file. */
4915 while (fsync (desc
) != 0)
4918 if (errno
!= EINVAL
)
4919 ok
= 0, save_errno
= errno
;
4924 modtime
= invalid_timespec ();
4927 if (fstat (desc
, &st
) == 0)
4928 modtime
= get_stat_mtime (&st
);
4930 ok
= 0, save_errno
= errno
;
4933 if (open_and_close_file
)
4935 /* NFS can report a write failure now. */
4936 if (emacs_close (desc
) < 0)
4937 ok
= 0, save_errno
= errno
;
4939 /* Discard the unwind protect for close_file_unwind. */
4940 specpdl_ptr
= specpdl
+ count1
;
4943 /* Some file systems have a bug where st_mtime is not updated
4944 properly after a write. For example, CIFS might not see the
4945 st_mtime change until after the file is opened again.
4947 Attempt to detect this file system bug, and update MODTIME to the
4948 newer st_mtime if the bug appears to be present. This introduces
4949 a race condition, so to avoid most instances of the race condition
4950 on non-buggy file systems, skip this check if the most recently
4951 encountered non-buggy file system was the current file system.
4953 A race condition can occur if some other process modifies the
4954 file between the fstat above and the fstat below, but the race is
4955 unlikely and a similar race between the last write and the fstat
4956 above cannot possibly be closed anyway. */
4958 if (timespec_valid_p (modtime
)
4959 && ! (valid_timestamp_file_system
&& st
.st_dev
== timestamp_file_system
))
4961 int desc1
= emacs_open (fn
, O_WRONLY
, 0);
4965 if (fstat (desc1
, &st1
) == 0
4966 && st
.st_dev
== st1
.st_dev
&& st
.st_ino
== st1
.st_ino
)
4968 /* Use the heuristic if it appears to be valid. With neither
4969 O_EXCL nor O_TRUNC, if Emacs happened to write nothing to the
4970 file, the time stamp won't change. Also, some non-POSIX
4971 systems don't update an empty file's time stamp when
4972 truncating it. Finally, file systems with 100 ns or worse
4973 resolution sometimes seem to have bugs: on a system with ns
4974 resolution, checking ns % 100 incorrectly avoids the heuristic
4975 1% of the time, but the problem should be temporary as we will
4976 try again on the next time stamp. */
4978 = ((open_flags
& (O_EXCL
| O_TRUNC
)) != 0
4980 && modtime
.tv_nsec
% 100 != 0);
4982 struct timespec modtime1
= get_stat_mtime (&st1
);
4984 && timespec_cmp (modtime
, modtime1
) == 0
4985 && st
.st_size
== st1
.st_size
)
4987 timestamp_file_system
= st
.st_dev
;
4988 valid_timestamp_file_system
= 1;
4992 st
.st_size
= st1
.st_size
;
4996 emacs_close (desc1
);
5000 /* Call write-region-post-annotation-function. */
5001 while (CONSP (Vwrite_region_annotation_buffers
))
5003 Lisp_Object buf
= XCAR (Vwrite_region_annotation_buffers
);
5004 if (!NILP (Fbuffer_live_p (buf
)))
5007 if (FUNCTIONP (Vwrite_region_post_annotation_function
))
5008 call0 (Vwrite_region_post_annotation_function
);
5010 Vwrite_region_annotation_buffers
5011 = XCDR (Vwrite_region_annotation_buffers
);
5014 unbind_to (count
, Qnil
);
5017 unlock_file (lockname
);
5019 /* Do this before reporting IO error
5020 to avoid a "file has changed on disk" warning on
5021 next attempt to save. */
5022 if (timespec_valid_p (modtime
))
5024 current_buffer
->modtime
= modtime
;
5025 current_buffer
->modtime_size
= st
.st_size
;
5029 report_file_errno ("Write error", filename
, save_errno
);
5033 SAVE_MODIFF
= MODIFF
;
5034 XSETFASTINT (BVAR (current_buffer
, save_length
), Z
- BEG
);
5035 bset_filename (current_buffer
, visit_file
);
5036 update_mode_lines
= 14;
5041 && ! NILP (Fstring_equal (BVAR (current_buffer
, filename
),
5042 BVAR (current_buffer
, auto_save_file_name
))))
5043 SAVE_MODIFF
= MODIFF
;
5048 if (!auto_saving
&& !noninteractive
)
5049 message_with_string ((NUMBERP (append
)
5059 DEFUN ("car-less-than-car", Fcar_less_than_car
, Scar_less_than_car
, 2, 2, 0,
5060 doc
: /* Return t if (car A) is numerically less than (car B). */)
5061 (Lisp_Object a
, Lisp_Object b
)
5063 return CALLN (Flss
, Fcar (a
), Fcar (b
));
5066 /* Build the complete list of annotations appropriate for writing out
5067 the text between START and END, by calling all the functions in
5068 write-region-annotate-functions and merging the lists they return.
5069 If one of these functions switches to a different buffer, we assume
5070 that buffer contains altered text. Therefore, the caller must
5071 make sure to restore the current buffer in all cases,
5072 as save-excursion would do. */
5075 build_annotations (Lisp_Object start
, Lisp_Object end
)
5077 Lisp_Object annotations
;
5079 Lisp_Object original_buffer
;
5081 bool used_global
= false;
5083 XSETBUFFER (original_buffer
, current_buffer
);
5086 p
= Vwrite_region_annotate_functions
;
5089 struct buffer
*given_buffer
= current_buffer
;
5090 if (EQ (Qt
, XCAR (p
)) && !used_global
)
5091 { /* Use the global value of the hook. */
5094 Fdefault_value (Qwrite_region_annotate_functions
),
5098 Vwrite_region_annotations_so_far
= annotations
;
5099 res
= call2 (XCAR (p
), start
, end
);
5100 /* If the function makes a different buffer current,
5101 assume that means this buffer contains altered text to be output.
5102 Reset START and END from the buffer bounds
5103 and discard all previous annotations because they should have
5104 been dealt with by this function. */
5105 if (current_buffer
!= given_buffer
)
5107 Vwrite_region_annotation_buffers
5108 = Fcons (Fcurrent_buffer (),
5109 Vwrite_region_annotation_buffers
);
5110 XSETFASTINT (start
, BEGV
);
5111 XSETFASTINT (end
, ZV
);
5114 Flength (res
); /* Check basic validity of return value */
5115 annotations
= merge (annotations
, res
, Qcar_less_than_car
);
5119 /* Now do the same for annotation functions implied by the file-format */
5120 if (auto_saving
&& (!EQ (BVAR (current_buffer
, auto_save_file_format
), Qt
)))
5121 p
= BVAR (current_buffer
, auto_save_file_format
);
5123 p
= BVAR (current_buffer
, file_format
);
5124 for (i
= 0; CONSP (p
); p
= XCDR (p
), ++i
)
5126 struct buffer
*given_buffer
= current_buffer
;
5128 Vwrite_region_annotations_so_far
= annotations
;
5130 /* Value is either a list of annotations or nil if the function
5131 has written annotations to a temporary buffer, which is now
5133 res
= call5 (Qformat_annotate_function
, XCAR (p
), start
, end
,
5134 original_buffer
, make_number (i
));
5135 if (current_buffer
!= given_buffer
)
5137 XSETFASTINT (start
, BEGV
);
5138 XSETFASTINT (end
, ZV
);
5143 annotations
= merge (annotations
, res
, Qcar_less_than_car
);
5150 /* Write to descriptor DESC the NCHARS chars starting at POS of STRING.
5151 If STRING is nil, POS is the character position in the current buffer.
5152 Intersperse with them the annotations from *ANNOT
5153 which fall within the range of POS to POS + NCHARS,
5154 each at its appropriate position.
5156 We modify *ANNOT by discarding elements as we use them up.
5158 Return true if successful. */
5161 a_write (int desc
, Lisp_Object string
, ptrdiff_t pos
,
5162 ptrdiff_t nchars
, Lisp_Object
*annot
,
5163 struct coding_system
*coding
)
5167 ptrdiff_t lastpos
= pos
+ nchars
;
5169 while (NILP (*annot
) || CONSP (*annot
))
5171 tem
= Fcar_safe (Fcar (*annot
));
5174 nextpos
= XFASTINT (tem
);
5176 /* If there are no more annotations in this range,
5177 output the rest of the range all at once. */
5178 if (! (nextpos
>= pos
&& nextpos
<= lastpos
))
5179 return e_write (desc
, string
, pos
, lastpos
, coding
);
5181 /* Output buffer text up to the next annotation's position. */
5184 if (!e_write (desc
, string
, pos
, nextpos
, coding
))
5188 /* Output the annotation. */
5189 tem
= Fcdr (Fcar (*annot
));
5192 if (!e_write (desc
, tem
, 0, SCHARS (tem
), coding
))
5195 *annot
= Fcdr (*annot
);
5200 /* Maximum number of characters that the next
5201 function encodes per one loop iteration. */
5203 enum { E_WRITE_MAX
= 8 * 1024 * 1024 };
5205 /* Write text in the range START and END into descriptor DESC,
5206 encoding them with coding system CODING. If STRING is nil, START
5207 and END are character positions of the current buffer, else they
5208 are indexes to the string STRING. Return true if successful. */
5211 e_write (int desc
, Lisp_Object string
, ptrdiff_t start
, ptrdiff_t end
,
5212 struct coding_system
*coding
)
5214 if (STRINGP (string
))
5217 end
= SCHARS (string
);
5220 /* We used to have a code for handling selective display here. But,
5221 now it is handled within encode_coding. */
5225 if (STRINGP (string
))
5227 coding
->src_multibyte
= SCHARS (string
) < SBYTES (string
);
5228 if (CODING_REQUIRE_ENCODING (coding
))
5230 ptrdiff_t nchars
= min (end
- start
, E_WRITE_MAX
);
5232 /* Avoid creating huge Lisp string in encode_coding_object. */
5233 if (nchars
== E_WRITE_MAX
)
5234 coding
->raw_destination
= 1;
5236 encode_coding_object
5237 (coding
, string
, start
, string_char_to_byte (string
, start
),
5238 start
+ nchars
, string_char_to_byte (string
, start
+ nchars
),
5243 coding
->dst_object
= string
;
5244 coding
->consumed_char
= SCHARS (string
);
5245 coding
->produced
= SBYTES (string
);
5250 ptrdiff_t start_byte
= CHAR_TO_BYTE (start
);
5251 ptrdiff_t end_byte
= CHAR_TO_BYTE (end
);
5253 coding
->src_multibyte
= (end
- start
) < (end_byte
- start_byte
);
5254 if (CODING_REQUIRE_ENCODING (coding
))
5256 ptrdiff_t nchars
= min (end
- start
, E_WRITE_MAX
);
5259 if (nchars
== E_WRITE_MAX
)
5260 coding
->raw_destination
= 1;
5262 encode_coding_object
5263 (coding
, Fcurrent_buffer (), start
, start_byte
,
5264 start
+ nchars
, CHAR_TO_BYTE (start
+ nchars
), Qt
);
5268 coding
->dst_object
= Qnil
;
5269 coding
->dst_pos_byte
= start_byte
;
5270 if (start
>= GPT
|| end
<= GPT
)
5272 coding
->consumed_char
= end
- start
;
5273 coding
->produced
= end_byte
- start_byte
;
5277 coding
->consumed_char
= GPT
- start
;
5278 coding
->produced
= GPT_BYTE
- start_byte
;
5283 if (coding
->produced
> 0)
5285 char *buf
= (coding
->raw_destination
? (char *) coding
->destination
5286 : (STRINGP (coding
->dst_object
)
5287 ? SSDATA (coding
->dst_object
)
5288 : (char *) BYTE_POS_ADDR (coding
->dst_pos_byte
)));
5289 coding
->produced
-= emacs_write_sig (desc
, buf
, coding
->produced
);
5291 if (coding
->raw_destination
)
5293 /* We're responsible for freeing this, see
5294 encode_coding_object to check why. */
5295 xfree (coding
->destination
);
5296 coding
->raw_destination
= 0;
5298 if (coding
->produced
)
5301 start
+= coding
->consumed_char
;
5307 DEFUN ("verify-visited-file-modtime", Fverify_visited_file_modtime
,
5308 Sverify_visited_file_modtime
, 0, 1, 0,
5309 doc
: /* Return t if last mod time of BUF's visited file matches what BUF records.
5310 This means that the file has not been changed since it was visited or saved.
5311 If BUF is omitted or nil, it defaults to the current buffer.
5312 See Info node `(elisp)Modification Time' for more details. */)
5315 struct buffer
*b
= decode_buffer (buf
);
5317 Lisp_Object handler
;
5318 Lisp_Object filename
;
5319 struct timespec mtime
;
5321 if (!STRINGP (BVAR (b
, filename
))) return Qt
;
5322 if (b
->modtime
.tv_nsec
== UNKNOWN_MODTIME_NSECS
) return Qt
;
5324 /* If the file name has special constructs in it,
5325 call the corresponding file handler. */
5326 handler
= Ffind_file_name_handler (BVAR (b
, filename
),
5327 Qverify_visited_file_modtime
);
5328 if (!NILP (handler
))
5329 return call2 (handler
, Qverify_visited_file_modtime
, buf
);
5331 filename
= ENCODE_FILE (BVAR (b
, filename
));
5333 mtime
= (stat (SSDATA (filename
), &st
) == 0
5334 ? get_stat_mtime (&st
)
5335 : time_error_value (errno
));
5336 if (timespec_cmp (mtime
, b
->modtime
) == 0
5337 && (b
->modtime_size
< 0
5338 || st
.st_size
== b
->modtime_size
))
5343 DEFUN ("visited-file-modtime", Fvisited_file_modtime
,
5344 Svisited_file_modtime
, 0, 0, 0,
5345 doc
: /* Return the current buffer's recorded visited file modification time.
5346 The value is a list of the form (HIGH LOW USEC PSEC), like the time values that
5347 `file-attributes' returns. If the current buffer has no recorded file
5348 modification time, this function returns 0. If the visited file
5349 doesn't exist, return -1.
5350 See Info node `(elisp)Modification Time' for more details. */)
5353 int ns
= current_buffer
->modtime
.tv_nsec
;
5355 return make_number (UNKNOWN_MODTIME_NSECS
- ns
);
5356 return make_lisp_time (current_buffer
->modtime
);
5359 DEFUN ("set-visited-file-modtime", Fset_visited_file_modtime
,
5360 Sset_visited_file_modtime
, 0, 1, 0,
5361 doc
: /* Update buffer's recorded modification time from the visited file's time.
5362 Useful if the buffer was not read from the file normally
5363 or if the file itself has been changed for some known benign reason.
5364 An argument specifies the modification time value to use
5365 \(instead of that of the visited file), in the form of a list
5366 \(HIGH LOW USEC PSEC) or an integer flag as returned by
5367 `visited-file-modtime'. */)
5368 (Lisp_Object time_flag
)
5370 if (!NILP (time_flag
))
5372 struct timespec mtime
;
5373 if (INTEGERP (time_flag
))
5375 CHECK_RANGED_INTEGER (time_flag
, -1, 0);
5376 mtime
= make_timespec (0, UNKNOWN_MODTIME_NSECS
- XINT (time_flag
));
5379 mtime
= lisp_time_argument (time_flag
);
5381 current_buffer
->modtime
= mtime
;
5382 current_buffer
->modtime_size
= -1;
5386 register Lisp_Object filename
;
5388 Lisp_Object handler
;
5390 filename
= Fexpand_file_name (BVAR (current_buffer
, filename
), Qnil
);
5392 /* If the file name has special constructs in it,
5393 call the corresponding file handler. */
5394 handler
= Ffind_file_name_handler (filename
, Qset_visited_file_modtime
);
5395 if (!NILP (handler
))
5396 /* The handler can find the file name the same way we did. */
5397 return call2 (handler
, Qset_visited_file_modtime
, Qnil
);
5399 filename
= ENCODE_FILE (filename
);
5401 if (stat (SSDATA (filename
), &st
) >= 0)
5403 current_buffer
->modtime
= get_stat_mtime (&st
);
5404 current_buffer
->modtime_size
= st
.st_size
;
5412 auto_save_error (Lisp_Object error_val
)
5414 auto_save_error_occurred
= 1;
5416 ring_bell (XFRAME (selected_frame
));
5418 AUTO_STRING (format
, "Auto-saving %s: %s");
5419 Lisp_Object msg
= CALLN (Fformat
, format
, BVAR (current_buffer
, name
),
5420 Ferror_message_string (error_val
));
5421 call3 (intern ("display-warning"),
5422 intern ("auto-save"), msg
, intern ("error"));
5433 auto_save_mode_bits
= 0666;
5435 /* Get visited file's mode to become the auto save file's mode. */
5436 if (! NILP (BVAR (current_buffer
, filename
)))
5438 if (stat (SSDATA (BVAR (current_buffer
, filename
)), &st
) >= 0)
5439 /* But make sure we can overwrite it later! */
5440 auto_save_mode_bits
= (st
.st_mode
| 0600) & 0777;
5441 else if (modes
= Ffile_modes (BVAR (current_buffer
, filename
)),
5443 /* Remote files don't cooperate with stat. */
5444 auto_save_mode_bits
= (XINT (modes
) | 0600) & 0777;
5448 Fwrite_region (Qnil
, Qnil
, BVAR (current_buffer
, auto_save_file_name
), Qnil
,
5449 NILP (Vauto_save_visited_file_name
) ? Qlambda
: Qt
,
5453 struct auto_save_unwind
5460 do_auto_save_unwind (void *arg
)
5462 struct auto_save_unwind
*p
= arg
;
5463 FILE *stream
= p
->stream
;
5464 minibuffer_auto_raise
= p
->auto_raise
;
5475 do_auto_save_make_dir (Lisp_Object dir
)
5479 auto_saving_dir_umask
= 077;
5480 result
= call2 (Qmake_directory
, dir
, Qt
);
5481 auto_saving_dir_umask
= 0;
5486 do_auto_save_eh (Lisp_Object ignore
)
5488 auto_saving_dir_umask
= 0;
5492 DEFUN ("do-auto-save", Fdo_auto_save
, Sdo_auto_save
, 0, 2, "",
5493 doc
: /* Auto-save all buffers that need it.
5494 This is all buffers that have auto-saving enabled
5495 and are changed since last auto-saved.
5496 Auto-saving writes the buffer into a file
5497 so that your editing is not lost if the system crashes.
5498 This file is not the file you visited; that changes only when you save.
5499 Normally we run the normal hook `auto-save-hook' before saving.
5501 A non-nil NO-MESSAGE argument means do not print any message if successful.
5502 A non-nil CURRENT-ONLY argument means save only current buffer. */)
5503 (Lisp_Object no_message
, Lisp_Object current_only
)
5505 struct buffer
*old
= current_buffer
, *b
;
5506 Lisp_Object tail
, buf
, hook
;
5507 bool auto_saved
= 0;
5508 int do_handled_files
;
5510 FILE *stream
= NULL
;
5511 ptrdiff_t count
= SPECPDL_INDEX ();
5512 bool orig_minibuffer_auto_raise
= minibuffer_auto_raise
;
5513 bool old_message_p
= 0;
5514 struct auto_save_unwind auto_save_unwind
;
5516 if (max_specpdl_size
< specpdl_size
+ 40)
5517 max_specpdl_size
= specpdl_size
+ 40;
5522 if (NILP (no_message
))
5524 old_message_p
= push_message ();
5525 record_unwind_protect_void (pop_message_unwind
);
5528 /* Ordinarily don't quit within this function,
5529 but don't make it impossible to quit (in case we get hung in I/O). */
5533 hook
= intern ("auto-save-hook");
5534 safe_run_hooks (hook
);
5536 if (STRINGP (Vauto_save_list_file_name
))
5538 Lisp_Object listfile
;
5540 listfile
= Fexpand_file_name (Vauto_save_list_file_name
, Qnil
);
5542 /* Don't try to create the directory when shutting down Emacs,
5543 because creating the directory might signal an error, and
5544 that would leave Emacs in a strange state. */
5545 if (!NILP (Vrun_hooks
))
5548 dir
= Ffile_name_directory (listfile
);
5549 if (NILP (Ffile_directory_p (dir
)))
5550 internal_condition_case_1 (do_auto_save_make_dir
,
5555 stream
= emacs_fopen (SSDATA (listfile
), "w");
5558 auto_save_unwind
.stream
= stream
;
5559 auto_save_unwind
.auto_raise
= minibuffer_auto_raise
;
5560 record_unwind_protect_ptr (do_auto_save_unwind
, &auto_save_unwind
);
5561 minibuffer_auto_raise
= 0;
5563 auto_save_error_occurred
= 0;
5565 /* On first pass, save all files that don't have handlers.
5566 On second pass, save all files that do have handlers.
5568 If Emacs is crashing, the handlers may tweak what is causing
5569 Emacs to crash in the first place, and it would be a shame if
5570 Emacs failed to autosave perfectly ordinary files because it
5571 couldn't handle some ange-ftp'd file. */
5573 for (do_handled_files
= 0; do_handled_files
< 2; do_handled_files
++)
5574 FOR_EACH_LIVE_BUFFER (tail
, buf
)
5578 /* Record all the buffers that have auto save mode
5579 in the special file that lists them. For each of these buffers,
5580 Record visited name (if any) and auto save name. */
5581 if (STRINGP (BVAR (b
, auto_save_file_name
))
5582 && stream
!= NULL
&& do_handled_files
== 0)
5585 if (!NILP (BVAR (b
, filename
)))
5587 fwrite (SDATA (BVAR (b
, filename
)), 1,
5588 SBYTES (BVAR (b
, filename
)), stream
);
5590 putc ('\n', stream
);
5591 fwrite (SDATA (BVAR (b
, auto_save_file_name
)), 1,
5592 SBYTES (BVAR (b
, auto_save_file_name
)), stream
);
5593 putc ('\n', stream
);
5597 if (!NILP (current_only
)
5598 && b
!= current_buffer
)
5601 /* Don't auto-save indirect buffers.
5602 The base buffer takes care of it. */
5606 /* Check for auto save enabled
5607 and file changed since last auto save
5608 and file changed since last real save. */
5609 if (STRINGP (BVAR (b
, auto_save_file_name
))
5610 && BUF_SAVE_MODIFF (b
) < BUF_MODIFF (b
)
5611 && BUF_AUTOSAVE_MODIFF (b
) < BUF_MODIFF (b
)
5612 /* -1 means we've turned off autosaving for a while--see below. */
5613 && XINT (BVAR (b
, save_length
)) >= 0
5614 && (do_handled_files
5615 || NILP (Ffind_file_name_handler (BVAR (b
, auto_save_file_name
),
5618 struct timespec before_time
= current_timespec ();
5619 struct timespec after_time
;
5621 /* If we had a failure, don't try again for 20 minutes. */
5622 if (b
->auto_save_failure_time
> 0
5623 && before_time
.tv_sec
- b
->auto_save_failure_time
< 1200)
5626 set_buffer_internal (b
);
5627 if (NILP (Vauto_save_include_big_deletions
)
5628 && (XFASTINT (BVAR (b
, save_length
)) * 10
5629 > (BUF_Z (b
) - BUF_BEG (b
)) * 13)
5630 /* A short file is likely to change a large fraction;
5631 spare the user annoying messages. */
5632 && XFASTINT (BVAR (b
, save_length
)) > 5000
5633 /* These messages are frequent and annoying for `*mail*'. */
5634 && !EQ (BVAR (b
, filename
), Qnil
)
5635 && NILP (no_message
))
5637 /* It has shrunk too much; turn off auto-saving here. */
5638 minibuffer_auto_raise
= orig_minibuffer_auto_raise
;
5639 message_with_string ("Buffer %s has shrunk a lot; auto save disabled in that buffer until next real save",
5641 minibuffer_auto_raise
= 0;
5642 /* Turn off auto-saving until there's a real save,
5643 and prevent any more warnings. */
5644 XSETINT (BVAR (b
, save_length
), -1);
5645 Fsleep_for (make_number (1), Qnil
);
5648 if (!auto_saved
&& NILP (no_message
))
5649 message1 ("Auto-saving...");
5650 internal_condition_case (auto_save_1
, Qt
, auto_save_error
);
5652 BUF_AUTOSAVE_MODIFF (b
) = BUF_MODIFF (b
);
5653 XSETFASTINT (BVAR (current_buffer
, save_length
), Z
- BEG
);
5654 set_buffer_internal (old
);
5656 after_time
= current_timespec ();
5658 /* If auto-save took more than 60 seconds,
5659 assume it was an NFS failure that got a timeout. */
5660 if (after_time
.tv_sec
- before_time
.tv_sec
> 60)
5661 b
->auto_save_failure_time
= after_time
.tv_sec
;
5665 /* Prevent another auto save till enough input events come in. */
5666 record_auto_save ();
5668 if (auto_saved
&& NILP (no_message
))
5672 /* If we are going to restore an old message,
5673 give time to read ours. */
5674 sit_for (make_number (1), 0, 0);
5677 else if (!auto_save_error_occurred
)
5678 /* Don't overwrite the error message if an error occurred.
5679 If we displayed a message and then restored a state
5680 with no message, leave a "done" message on the screen. */
5681 message1 ("Auto-saving...done");
5686 /* This restores the message-stack status. */
5687 unbind_to (count
, Qnil
);
5691 DEFUN ("set-buffer-auto-saved", Fset_buffer_auto_saved
,
5692 Sset_buffer_auto_saved
, 0, 0, 0,
5693 doc
: /* Mark current buffer as auto-saved with its current text.
5694 No auto-save file will be written until the buffer changes again. */)
5697 /* FIXME: This should not be called in indirect buffers, since
5698 they're not autosaved. */
5699 BUF_AUTOSAVE_MODIFF (current_buffer
) = MODIFF
;
5700 XSETFASTINT (BVAR (current_buffer
, save_length
), Z
- BEG
);
5701 current_buffer
->auto_save_failure_time
= 0;
5705 DEFUN ("clear-buffer-auto-save-failure", Fclear_buffer_auto_save_failure
,
5706 Sclear_buffer_auto_save_failure
, 0, 0, 0,
5707 doc
: /* Clear any record of a recent auto-save failure in the current buffer. */)
5710 current_buffer
->auto_save_failure_time
= 0;
5714 DEFUN ("recent-auto-save-p", Frecent_auto_save_p
, Srecent_auto_save_p
,
5716 doc
: /* Return t if current buffer has been auto-saved recently.
5717 More precisely, if it has been auto-saved since last read from or saved
5718 in the visited file. If the buffer has no visited file,
5719 then any auto-save counts as "recent". */)
5722 /* FIXME: maybe we should return nil for indirect buffers since
5723 they're never autosaved. */
5724 return (SAVE_MODIFF
< BUF_AUTOSAVE_MODIFF (current_buffer
) ? Qt
: Qnil
);
5727 /* Reading and completing file names. */
5729 DEFUN ("next-read-file-uses-dialog-p", Fnext_read_file_uses_dialog_p
,
5730 Snext_read_file_uses_dialog_p
, 0, 0, 0,
5731 doc
: /* Return t if a call to `read-file-name' will use a dialog.
5732 The return value is only relevant for a call to `read-file-name' that happens
5733 before any other event (mouse or keypress) is handled. */)
5736 #if (defined USE_GTK || defined USE_MOTIF \
5737 || defined HAVE_NS || defined HAVE_NTGUI)
5738 if ((NILP (last_nonmenu_event
) || CONSP (last_nonmenu_event
))
5741 && window_system_available (SELECTED_FRAME ()))
5748 DEFUN ("set-binary-mode", Fset_binary_mode
, Sset_binary_mode
, 2, 2, 0,
5749 doc
: /* Switch STREAM to binary I/O mode or text I/O mode.
5750 STREAM can be one of the symbols `stdin', `stdout', or `stderr'.
5751 If MODE is non-nil, switch STREAM to binary mode, otherwise switch
5754 As a side effect, this function flushes any pending STREAM's data.
5756 Value is the previous value of STREAM's I/O mode, nil for text mode,
5757 non-nil for binary mode.
5759 On MS-Windows and MS-DOS, binary mode is needed to read or write
5760 arbitrary binary data, and for disabling translation between CR-LF
5761 pairs and a single newline character. Examples include generation
5762 of text files with Unix-style end-of-line format using `princ' in
5763 batch mode, with standard output redirected to a file.
5765 On Posix systems, this function always returns non-nil, and has no
5766 effect except for flushing STREAM's data. */)
5767 (Lisp_Object stream
, Lisp_Object mode
)
5772 CHECK_SYMBOL (stream
);
5773 if (EQ (stream
, Qstdin
))
5775 else if (EQ (stream
, Qstdout
))
5777 else if (EQ (stream
, Qstderr
))
5780 xsignal2 (Qerror
, build_string ("unsupported stream"), stream
);
5782 binmode
= NILP (mode
) ? O_TEXT
: O_BINARY
;
5786 return (set_binary_mode (fileno (fp
), binmode
) == O_BINARY
) ? Qt
: Qnil
;
5792 realmask
= umask (0);
5795 valid_timestamp_file_system
= 0;
5797 /* fsync can be a significant performance hit. Often it doesn't
5798 suffice to make the file-save operation survive a crash. For
5799 batch scripts, which are typically part of larger shell commands
5800 that don't fsync other files, its effect on performance can be
5801 significant so its utility is particularly questionable.
5802 Hence, for now by default fsync is used only when interactive.
5804 For more on why fsync often fails to work on today's hardware, see:
5805 Zheng M et al. Understanding the robustness of SSDs under power fault.
5806 11th USENIX Conf. on File and Storage Technologies, 2013 (FAST '13), 271-84
5807 http://www.usenix.org/system/files/conference/fast13/fast13-final80.pdf
5809 For more on why fsync does not suffice even if it works properly, see:
5810 Roche X. Necessary step(s) to synchronize filename operations on disk.
5811 Austin Group Defect 672, 2013-03-19
5812 http://austingroupbugs.net/view.php?id=672 */
5813 write_region_inhibit_fsync
= noninteractive
;
5817 syms_of_fileio (void)
5819 /* Property name of a file name handler,
5820 which gives a list of operations it handles. */
5821 DEFSYM (Qoperations
, "operations");
5823 DEFSYM (Qexpand_file_name
, "expand-file-name");
5824 DEFSYM (Qsubstitute_in_file_name
, "substitute-in-file-name");
5825 DEFSYM (Qdirectory_file_name
, "directory-file-name");
5826 DEFSYM (Qfile_name_directory
, "file-name-directory");
5827 DEFSYM (Qfile_name_nondirectory
, "file-name-nondirectory");
5828 DEFSYM (Qunhandled_file_name_directory
, "unhandled-file-name-directory");
5829 DEFSYM (Qfile_name_as_directory
, "file-name-as-directory");
5830 DEFSYM (Qcopy_file
, "copy-file");
5831 DEFSYM (Qmake_directory_internal
, "make-directory-internal");
5832 DEFSYM (Qmake_directory
, "make-directory");
5833 DEFSYM (Qdelete_file
, "delete-file");
5834 DEFSYM (Qrename_file
, "rename-file");
5835 DEFSYM (Qadd_name_to_file
, "add-name-to-file");
5836 DEFSYM (Qmake_symbolic_link
, "make-symbolic-link");
5837 DEFSYM (Qfile_exists_p
, "file-exists-p");
5838 DEFSYM (Qfile_executable_p
, "file-executable-p");
5839 DEFSYM (Qfile_readable_p
, "file-readable-p");
5840 DEFSYM (Qfile_writable_p
, "file-writable-p");
5841 DEFSYM (Qfile_symlink_p
, "file-symlink-p");
5842 DEFSYM (Qaccess_file
, "access-file");
5843 DEFSYM (Qfile_directory_p
, "file-directory-p");
5844 DEFSYM (Qfile_regular_p
, "file-regular-p");
5845 DEFSYM (Qfile_accessible_directory_p
, "file-accessible-directory-p");
5846 DEFSYM (Qfile_modes
, "file-modes");
5847 DEFSYM (Qset_file_modes
, "set-file-modes");
5848 DEFSYM (Qset_file_times
, "set-file-times");
5849 DEFSYM (Qfile_selinux_context
, "file-selinux-context");
5850 DEFSYM (Qset_file_selinux_context
, "set-file-selinux-context");
5851 DEFSYM (Qfile_acl
, "file-acl");
5852 DEFSYM (Qset_file_acl
, "set-file-acl");
5853 DEFSYM (Qfile_newer_than_file_p
, "file-newer-than-file-p");
5854 DEFSYM (Qinsert_file_contents
, "insert-file-contents");
5855 DEFSYM (Qwrite_region
, "write-region");
5856 DEFSYM (Qverify_visited_file_modtime
, "verify-visited-file-modtime");
5857 DEFSYM (Qset_visited_file_modtime
, "set-visited-file-modtime");
5859 /* The symbol bound to coding-system-for-read when
5860 insert-file-contents is called for recovering a file. This is not
5861 an actual coding system name, but just an indicator to tell
5862 insert-file-contents to use `emacs-mule' with a special flag for
5863 auto saving and recovering a file. */
5864 DEFSYM (Qauto_save_coding
, "auto-save-coding");
5866 DEFSYM (Qfile_name_history
, "file-name-history");
5867 Fset (Qfile_name_history
, Qnil
);
5869 DEFSYM (Qfile_error
, "file-error");
5870 DEFSYM (Qfile_already_exists
, "file-already-exists");
5871 DEFSYM (Qfile_date_error
, "file-date-error");
5872 DEFSYM (Qfile_notify_error
, "file-notify-error");
5873 DEFSYM (Qexcl
, "excl");
5875 DEFVAR_LISP ("file-name-coding-system", Vfile_name_coding_system
,
5876 doc
: /* Coding system for encoding file names.
5877 If it is nil, `default-file-name-coding-system' (which see) is used.
5879 On MS-Windows, the value of this variable is largely ignored if
5880 `w32-unicode-filenames' (which see) is non-nil. Emacs on Windows
5881 behaves as if file names were encoded in `utf-8'. */);
5882 Vfile_name_coding_system
= Qnil
;
5884 DEFVAR_LISP ("default-file-name-coding-system",
5885 Vdefault_file_name_coding_system
,
5886 doc
: /* Default coding system for encoding file names.
5887 This variable is used only when `file-name-coding-system' is nil.
5889 This variable is set/changed by the command `set-language-environment'.
5890 User should not set this variable manually,
5891 instead use `file-name-coding-system' to get a constant encoding
5892 of file names regardless of the current language environment.
5894 On MS-Windows, the value of this variable is largely ignored if
5895 `w32-unicode-filenames' (which see) is non-nil. Emacs on Windows
5896 behaves as if file names were encoded in `utf-8'. */);
5897 Vdefault_file_name_coding_system
= Qnil
;
5899 /* Lisp functions for translating file formats. */
5900 DEFSYM (Qformat_decode
, "format-decode");
5901 DEFSYM (Qformat_annotate_function
, "format-annotate-function");
5903 /* Lisp function for setting buffer-file-coding-system and the
5904 multibyteness of the current buffer after inserting a file. */
5905 DEFSYM (Qafter_insert_file_set_coding
, "after-insert-file-set-coding");
5907 DEFSYM (Qcar_less_than_car
, "car-less-than-car");
5909 Fput (Qfile_error
, Qerror_conditions
,
5910 Fpurecopy (list2 (Qfile_error
, Qerror
)));
5911 Fput (Qfile_error
, Qerror_message
,
5912 build_pure_c_string ("File error"));
5914 Fput (Qfile_already_exists
, Qerror_conditions
,
5915 Fpurecopy (list3 (Qfile_already_exists
, Qfile_error
, Qerror
)));
5916 Fput (Qfile_already_exists
, Qerror_message
,
5917 build_pure_c_string ("File already exists"));
5919 Fput (Qfile_date_error
, Qerror_conditions
,
5920 Fpurecopy (list3 (Qfile_date_error
, Qfile_error
, Qerror
)));
5921 Fput (Qfile_date_error
, Qerror_message
,
5922 build_pure_c_string ("Cannot set file date"));
5924 Fput (Qfile_notify_error
, Qerror_conditions
,
5925 Fpurecopy (list3 (Qfile_notify_error
, Qfile_error
, Qerror
)));
5926 Fput (Qfile_notify_error
, Qerror_message
,
5927 build_pure_c_string ("File notification error"));
5929 DEFVAR_LISP ("file-name-handler-alist", Vfile_name_handler_alist
,
5930 doc
: /* Alist of elements (REGEXP . HANDLER) for file names handled specially.
5931 If a file name matches REGEXP, all I/O on that file is done by calling
5932 HANDLER. If a file name matches more than one handler, the handler
5933 whose match starts last in the file name gets precedence. The
5934 function `find-file-name-handler' checks this list for a handler for
5937 HANDLER should be a function. The first argument given to it is the
5938 name of the I/O primitive to be handled; the remaining arguments are
5939 the arguments that were passed to that primitive. For example, if you
5940 do (file-exists-p FILENAME) and FILENAME is handled by HANDLER, then
5941 HANDLER is called like this:
5943 (funcall HANDLER \\='file-exists-p FILENAME)
5945 Note that HANDLER must be able to handle all I/O primitives; if it has
5946 nothing special to do for a primitive, it should reinvoke the
5947 primitive to handle the operation \"the usual way\".
5948 See Info node `(elisp)Magic File Names' for more details. */);
5949 Vfile_name_handler_alist
= Qnil
;
5951 DEFVAR_LISP ("set-auto-coding-function",
5952 Vset_auto_coding_function
,
5953 doc
: /* If non-nil, a function to call to decide a coding system of file.
5954 Two arguments are passed to this function: the file name
5955 and the length of a file contents following the point.
5956 This function should return a coding system to decode the file contents.
5957 It should check the file name against `auto-coding-alist'.
5958 If no coding system is decided, it should check a coding system
5959 specified in the heading lines with the format:
5960 -*- ... coding: CODING-SYSTEM; ... -*-
5961 or local variable spec of the tailing lines with `coding:' tag. */);
5962 Vset_auto_coding_function
= Qnil
;
5964 DEFVAR_LISP ("after-insert-file-functions", Vafter_insert_file_functions
,
5965 doc
: /* A list of functions to be called at the end of `insert-file-contents'.
5966 Each is passed one argument, the number of characters inserted,
5967 with point at the start of the inserted text. Each function
5968 should leave point the same, and return the new character count.
5969 If `insert-file-contents' is intercepted by a handler from
5970 `file-name-handler-alist', that handler is responsible for calling the
5971 functions in `after-insert-file-functions' if appropriate. */);
5972 Vafter_insert_file_functions
= Qnil
;
5974 DEFVAR_LISP ("write-region-annotate-functions", Vwrite_region_annotate_functions
,
5975 doc
: /* A list of functions to be called at the start of `write-region'.
5976 Each is passed two arguments, START and END as for `write-region'.
5977 These are usually two numbers but not always; see the documentation
5978 for `write-region'. The function should return a list of pairs
5979 of the form (POSITION . STRING), consisting of strings to be effectively
5980 inserted at the specified positions of the file being written (1 means to
5981 insert before the first byte written). The POSITIONs must be sorted into
5984 If there are several annotation functions, the lists returned by these
5985 functions are merged destructively. As each annotation function runs,
5986 the variable `write-region-annotations-so-far' contains a list of all
5987 annotations returned by previous annotation functions.
5989 An annotation function can return with a different buffer current.
5990 Doing so removes the annotations returned by previous functions, and
5991 resets START and END to `point-min' and `point-max' of the new buffer.
5993 After `write-region' completes, Emacs calls the function stored in
5994 `write-region-post-annotation-function', once for each buffer that was
5995 current when building the annotations (i.e., at least once), with that
5996 buffer current. */);
5997 Vwrite_region_annotate_functions
= Qnil
;
5998 DEFSYM (Qwrite_region_annotate_functions
, "write-region-annotate-functions");
6000 DEFVAR_LISP ("write-region-post-annotation-function",
6001 Vwrite_region_post_annotation_function
,
6002 doc
: /* Function to call after `write-region' completes.
6003 The function is called with no arguments. If one or more of the
6004 annotation functions in `write-region-annotate-functions' changed the
6005 current buffer, the function stored in this variable is called for
6006 each of those additional buffers as well, in addition to the original
6007 buffer. The relevant buffer is current during each function call. */);
6008 Vwrite_region_post_annotation_function
= Qnil
;
6009 staticpro (&Vwrite_region_annotation_buffers
);
6011 DEFVAR_LISP ("write-region-annotations-so-far",
6012 Vwrite_region_annotations_so_far
,
6013 doc
: /* When an annotation function is called, this holds the previous annotations.
6014 These are the annotations made by other annotation functions
6015 that were already called. See also `write-region-annotate-functions'. */);
6016 Vwrite_region_annotations_so_far
= Qnil
;
6018 DEFVAR_LISP ("inhibit-file-name-handlers", Vinhibit_file_name_handlers
,
6019 doc
: /* A list of file name handlers that temporarily should not be used.
6020 This applies only to the operation `inhibit-file-name-operation'. */);
6021 Vinhibit_file_name_handlers
= Qnil
;
6023 DEFVAR_LISP ("inhibit-file-name-operation", Vinhibit_file_name_operation
,
6024 doc
: /* The operation for which `inhibit-file-name-handlers' is applicable. */);
6025 Vinhibit_file_name_operation
= Qnil
;
6027 DEFVAR_LISP ("auto-save-list-file-name", Vauto_save_list_file_name
,
6028 doc
: /* File name in which we write a list of all auto save file names.
6029 This variable is initialized automatically from `auto-save-list-file-prefix'
6030 shortly after Emacs reads your init file, if you have not yet given it
6031 a non-nil value. */);
6032 Vauto_save_list_file_name
= Qnil
;
6034 DEFVAR_LISP ("auto-save-visited-file-name", Vauto_save_visited_file_name
,
6035 doc
: /* Non-nil says auto-save a buffer in the file it is visiting, when practical.
6036 Normally auto-save files are written under other names. */);
6037 Vauto_save_visited_file_name
= Qnil
;
6039 DEFVAR_LISP ("auto-save-include-big-deletions", Vauto_save_include_big_deletions
,
6040 doc
: /* If non-nil, auto-save even if a large part of the text is deleted.
6041 If nil, deleting a substantial portion of the text disables auto-save
6042 in the buffer; this is the default behavior, because the auto-save
6043 file is usually more useful if it contains the deleted text. */);
6044 Vauto_save_include_big_deletions
= Qnil
;
6046 DEFVAR_BOOL ("write-region-inhibit-fsync", write_region_inhibit_fsync
,
6047 doc
: /* Non-nil means don't call fsync in `write-region'.
6048 This variable affects calls to `write-region' as well as save commands.
6049 Setting this to nil may avoid data loss if the system loses power or
6050 the operating system crashes. By default, it is non-nil in batch mode. */);
6051 write_region_inhibit_fsync
= 0; /* See also `init_fileio' above. */
6053 DEFVAR_BOOL ("delete-by-moving-to-trash", delete_by_moving_to_trash
,
6054 doc
: /* Specifies whether to use the system's trash can.
6055 When non-nil, certain file deletion commands use the function
6056 `move-file-to-trash' instead of deleting files outright.
6057 This includes interactive calls to `delete-file' and
6058 `delete-directory' and the Dired deletion commands. */);
6059 delete_by_moving_to_trash
= 0;
6060 DEFSYM (Qdelete_by_moving_to_trash
, "delete-by-moving-to-trash");
6062 /* Lisp function for moving files to trash. */
6063 DEFSYM (Qmove_file_to_trash
, "move-file-to-trash");
6065 /* Lisp function for recursively copying directories. */
6066 DEFSYM (Qcopy_directory
, "copy-directory");
6068 /* Lisp function for recursively deleting directories. */
6069 DEFSYM (Qdelete_directory
, "delete-directory");
6071 DEFSYM (Qsubstitute_env_in_file_name
, "substitute-env-in-file-name");
6072 DEFSYM (Qget_buffer_window_list
, "get-buffer-window-list");
6074 DEFSYM (Qstdin
, "stdin");
6075 DEFSYM (Qstdout
, "stdout");
6076 DEFSYM (Qstderr
, "stderr");
6078 defsubr (&Sfind_file_name_handler
);
6079 defsubr (&Sfile_name_directory
);
6080 defsubr (&Sfile_name_nondirectory
);
6081 defsubr (&Sunhandled_file_name_directory
);
6082 defsubr (&Sfile_name_as_directory
);
6083 defsubr (&Sdirectory_file_name
);
6084 defsubr (&Smake_temp_name
);
6085 defsubr (&Sexpand_file_name
);
6086 defsubr (&Ssubstitute_in_file_name
);
6087 defsubr (&Scopy_file
);
6088 defsubr (&Smake_directory_internal
);
6089 defsubr (&Sdelete_directory_internal
);
6090 defsubr (&Sdelete_file
);
6091 defsubr (&Srename_file
);
6092 defsubr (&Sadd_name_to_file
);
6093 defsubr (&Smake_symbolic_link
);
6094 defsubr (&Sfile_name_absolute_p
);
6095 defsubr (&Sfile_exists_p
);
6096 defsubr (&Sfile_executable_p
);
6097 defsubr (&Sfile_readable_p
);
6098 defsubr (&Sfile_writable_p
);
6099 defsubr (&Saccess_file
);
6100 defsubr (&Sfile_symlink_p
);
6101 defsubr (&Sfile_directory_p
);
6102 defsubr (&Sfile_accessible_directory_p
);
6103 defsubr (&Sfile_regular_p
);
6104 defsubr (&Sfile_modes
);
6105 defsubr (&Sset_file_modes
);
6106 defsubr (&Sset_file_times
);
6107 defsubr (&Sfile_selinux_context
);
6108 defsubr (&Sfile_acl
);
6109 defsubr (&Sset_file_acl
);
6110 defsubr (&Sset_file_selinux_context
);
6111 defsubr (&Sset_default_file_modes
);
6112 defsubr (&Sdefault_file_modes
);
6113 defsubr (&Sfile_newer_than_file_p
);
6114 defsubr (&Sinsert_file_contents
);
6115 defsubr (&Swrite_region
);
6116 defsubr (&Scar_less_than_car
);
6117 defsubr (&Sverify_visited_file_modtime
);
6118 defsubr (&Svisited_file_modtime
);
6119 defsubr (&Sset_visited_file_modtime
);
6120 defsubr (&Sdo_auto_save
);
6121 defsubr (&Sset_buffer_auto_saved
);
6122 defsubr (&Sclear_buffer_auto_save_failure
);
6123 defsubr (&Srecent_auto_save_p
);
6125 defsubr (&Snext_read_file_uses_dialog_p
);
6127 defsubr (&Sset_binary_mode
);
6130 defsubr (&Sunix_sync
);