(Fwrite_region): If handler, don't mess with modtime.
[bpt/emacs.git] / src / fileio.c
1 /* File IO for GNU Emacs.
2 Copyright (C) 1985, 1986, 1987, 1988, 1993 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
19
20 #include <config.h>
21
22 #include <sys/types.h>
23 #include <sys/stat.h>
24
25 #if !defined (S_ISLNK) && defined (S_IFLNK)
26 # define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
27 #endif
28
29 #if !defined (S_ISREG) && defined (S_IFREG)
30 # define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
31 #endif
32
33 #ifdef VMS
34 #include "vms-pwd.h"
35 #else
36 #include <pwd.h>
37 #endif
38
39 #include <ctype.h>
40
41 #ifdef VMS
42 #include "dir.h"
43 #include <perror.h>
44 #include <stddef.h>
45 #include <string.h>
46 #endif
47
48 #include <errno.h>
49
50 #ifndef vax11c
51 extern int errno;
52 extern char *sys_errlist[];
53 extern int sys_nerr;
54 #endif
55
56 #define err_str(a) ((a) < sys_nerr ? sys_errlist[a] : "unknown error")
57
58 #ifdef APOLLO
59 #include <sys/time.h>
60 #endif
61
62 #ifndef USG
63 #ifndef VMS
64 #ifndef BSD4_1
65 #define HAVE_FSYNC
66 #endif
67 #endif
68 #endif
69
70 #include "lisp.h"
71 #include "intervals.h"
72 #include "buffer.h"
73 #include "window.h"
74
75 #ifdef VMS
76 #include <file.h>
77 #include <rmsdef.h>
78 #include <fab.h>
79 #include <nam.h>
80 #endif
81
82 #include "systime.h"
83
84 #ifdef HPUX
85 #include <netio.h>
86 #ifndef HPUX8
87 #ifndef HPUX9
88 #include <errnet.h>
89 #endif
90 #endif
91 #endif
92
93 #ifndef O_WRONLY
94 #define O_WRONLY 1
95 #endif
96
97 #define min(a, b) ((a) < (b) ? (a) : (b))
98 #define max(a, b) ((a) > (b) ? (a) : (b))
99
100 /* Nonzero during writing of auto-save files */
101 int auto_saving;
102
103 /* Set by auto_save_1 to mode of original file so Fwrite_region will create
104 a new file with the same mode as the original */
105 int auto_save_mode_bits;
106
107 /* Alist of elements (REGEXP . HANDLER) for file names
108 whose I/O is done with a special handler. */
109 Lisp_Object Vfile_name_handler_alist;
110
111 /* Functions to be called to process text properties in inserted file. */
112 Lisp_Object Vafter_insert_file_functions;
113
114 /* Functions to be called to create text property annotations for file. */
115 Lisp_Object Vwrite_region_annotate_functions;
116
117 /* Nonzero means, when reading a filename in the minibuffer,
118 start out by inserting the default directory into the minibuffer. */
119 int insert_default_directory;
120
121 /* On VMS, nonzero means write new files with record format stmlf.
122 Zero means use var format. */
123 int vms_stmlf_recfm;
124
125 Lisp_Object Qfile_error, Qfile_already_exists;
126
127 Lisp_Object Qfile_name_history;
128
129 Lisp_Object Qcar_less_than_car;
130
131 report_file_error (string, data)
132 char *string;
133 Lisp_Object data;
134 {
135 Lisp_Object errstring;
136
137 if (errno >= 0 && errno < sys_nerr)
138 errstring = build_string (sys_errlist[errno]);
139 else
140 errstring = build_string ("undocumented error code");
141
142 /* System error messages are capitalized. Downcase the initial
143 unless it is followed by a slash. */
144 if (XSTRING (errstring)->data[1] != '/')
145 XSTRING (errstring)->data[0] = DOWNCASE (XSTRING (errstring)->data[0]);
146
147 while (1)
148 Fsignal (Qfile_error,
149 Fcons (build_string (string), Fcons (errstring, data)));
150 }
151
152 close_file_unwind (fd)
153 Lisp_Object fd;
154 {
155 close (XFASTINT (fd));
156 }
157 \f
158 Lisp_Object Qexpand_file_name;
159 Lisp_Object Qdirectory_file_name;
160 Lisp_Object Qfile_name_directory;
161 Lisp_Object Qfile_name_nondirectory;
162 Lisp_Object Qunhandled_file_name_directory;
163 Lisp_Object Qfile_name_as_directory;
164 Lisp_Object Qcopy_file;
165 Lisp_Object Qmake_directory;
166 Lisp_Object Qdelete_directory;
167 Lisp_Object Qdelete_file;
168 Lisp_Object Qrename_file;
169 Lisp_Object Qadd_name_to_file;
170 Lisp_Object Qmake_symbolic_link;
171 Lisp_Object Qfile_exists_p;
172 Lisp_Object Qfile_executable_p;
173 Lisp_Object Qfile_readable_p;
174 Lisp_Object Qfile_symlink_p;
175 Lisp_Object Qfile_writable_p;
176 Lisp_Object Qfile_directory_p;
177 Lisp_Object Qfile_accessible_directory_p;
178 Lisp_Object Qfile_modes;
179 Lisp_Object Qset_file_modes;
180 Lisp_Object Qfile_newer_than_file_p;
181 Lisp_Object Qinsert_file_contents;
182 Lisp_Object Qwrite_region;
183 Lisp_Object Qverify_visited_file_modtime;
184 Lisp_Object Qset_visited_file_modtime;
185
186 DEFUN ("find-file-name-handler", Ffind_file_name_handler, Sfind_file_name_handler, 1, 1, 0,
187 "Return FILENAME's handler function, if its syntax is handled specially.\n\
188 Otherwise, return nil.\n\
189 A file name is handled if one of the regular expressions in\n\
190 `file-name-handler-alist' matches it.")
191 (filename)
192 Lisp_Object filename;
193 {
194 /* This function must not munge the match data. */
195 Lisp_Object chain;
196
197 CHECK_STRING (filename, 0);
198
199 for (chain = Vfile_name_handler_alist; XTYPE (chain) == Lisp_Cons;
200 chain = XCONS (chain)->cdr)
201 {
202 Lisp_Object elt;
203 elt = XCONS (chain)->car;
204 if (XTYPE (elt) == Lisp_Cons)
205 {
206 Lisp_Object string;
207 string = XCONS (elt)->car;
208 if (XTYPE (string) == Lisp_String
209 && fast_string_match (string, filename) >= 0)
210 return XCONS (elt)->cdr;
211 }
212
213 QUIT;
214 }
215 return Qnil;
216 }
217 \f
218 DEFUN ("file-name-directory", Ffile_name_directory, Sfile_name_directory,
219 1, 1, 0,
220 "Return the directory component in file name NAME.\n\
221 Return nil if NAME does not include a directory.\n\
222 Otherwise return a directory spec.\n\
223 Given a Unix syntax file name, returns a string ending in slash;\n\
224 on VMS, perhaps instead a string ending in `:', `]' or `>'.")
225 (file)
226 Lisp_Object file;
227 {
228 register unsigned char *beg;
229 register unsigned char *p;
230 Lisp_Object handler;
231
232 CHECK_STRING (file, 0);
233
234 /* If the file name has special constructs in it,
235 call the corresponding file handler. */
236 handler = Ffind_file_name_handler (file);
237 if (!NILP (handler))
238 return call2 (handler, Qfile_name_directory, file);
239
240 beg = XSTRING (file)->data;
241 p = beg + XSTRING (file)->size;
242
243 while (p != beg && p[-1] != '/'
244 #ifdef VMS
245 && p[-1] != ':' && p[-1] != ']' && p[-1] != '>'
246 #endif /* VMS */
247 ) p--;
248
249 if (p == beg)
250 return Qnil;
251 return make_string (beg, p - beg);
252 }
253
254 DEFUN ("file-name-nondirectory", Ffile_name_nondirectory, Sfile_name_nondirectory,
255 1, 1, 0,
256 "Return file name NAME sans its directory.\n\
257 For example, in a Unix-syntax file name,\n\
258 this is everything after the last slash,\n\
259 or the entire name if it contains no slash.")
260 (file)
261 Lisp_Object file;
262 {
263 register unsigned char *beg, *p, *end;
264 Lisp_Object handler;
265
266 CHECK_STRING (file, 0);
267
268 /* If the file name has special constructs in it,
269 call the corresponding file handler. */
270 handler = Ffind_file_name_handler (file);
271 if (!NILP (handler))
272 return call2 (handler, Qfile_name_nondirectory, file);
273
274 beg = XSTRING (file)->data;
275 end = p = beg + XSTRING (file)->size;
276
277 while (p != beg && p[-1] != '/'
278 #ifdef VMS
279 && p[-1] != ':' && p[-1] != ']' && p[-1] != '>'
280 #endif /* VMS */
281 ) p--;
282
283 return make_string (p, end - p);
284 }
285
286 DEFUN ("unhandled-file-name-directory", Funhandled_file_name_directory, Sunhandled_file_name_directory, 1, 1, 0,
287 "Return a directly usable directory name somehow associated with FILENAME.\n\
288 A `directly usable' directory name is one that may be used without the\n\
289 intervention of any file handler.\n\
290 If FILENAME is a directly usable file itself, return\n\
291 (file-name-directory FILENAME).\n\
292 The `call-process' and `start-process' functions use this function to\n\
293 get a current directory to run processes in.")
294 (filename)
295 Lisp_Object filename;
296 {
297 Lisp_Object handler;
298
299 /* If the file name has special constructs in it,
300 call the corresponding file handler. */
301 handler = Ffind_file_name_handler (filename);
302 if (!NILP (handler))
303 return call2 (handler, Qunhandled_file_name_directory, filename);
304
305 return Ffile_name_directory (filename);
306 }
307
308 \f
309 char *
310 file_name_as_directory (out, in)
311 char *out, *in;
312 {
313 int size = strlen (in) - 1;
314
315 strcpy (out, in);
316
317 #ifdef VMS
318 /* Is it already a directory string? */
319 if (in[size] == ':' || in[size] == ']' || in[size] == '>')
320 return out;
321 /* Is it a VMS directory file name? If so, hack VMS syntax. */
322 else if (! index (in, '/')
323 && ((size > 3 && ! strcmp (&in[size - 3], ".DIR"))
324 || (size > 3 && ! strcmp (&in[size - 3], ".dir"))
325 || (size > 5 && (! strncmp (&in[size - 5], ".DIR", 4)
326 || ! strncmp (&in[size - 5], ".dir", 4))
327 && (in[size - 1] == '.' || in[size - 1] == ';')
328 && in[size] == '1')))
329 {
330 register char *p, *dot;
331 char brack;
332
333 /* x.dir -> [.x]
334 dir:x.dir --> dir:[x]
335 dir:[x]y.dir --> dir:[x.y] */
336 p = in + size;
337 while (p != in && *p != ':' && *p != '>' && *p != ']') p--;
338 if (p != in)
339 {
340 strncpy (out, in, p - in);
341 out[p - in] = '\0';
342 if (*p == ':')
343 {
344 brack = ']';
345 strcat (out, ":[");
346 }
347 else
348 {
349 brack = *p;
350 strcat (out, ".");
351 }
352 p++;
353 }
354 else
355 {
356 brack = ']';
357 strcpy (out, "[.");
358 }
359 dot = index (p, '.');
360 if (dot)
361 {
362 /* blindly remove any extension */
363 size = strlen (out) + (dot - p);
364 strncat (out, p, dot - p);
365 }
366 else
367 {
368 strcat (out, p);
369 size = strlen (out);
370 }
371 out[size++] = brack;
372 out[size] = '\0';
373 }
374 #else /* not VMS */
375 /* For Unix syntax, Append a slash if necessary */
376 if (out[size] != '/')
377 strcat (out, "/");
378 #endif /* not VMS */
379 return out;
380 }
381
382 DEFUN ("file-name-as-directory", Ffile_name_as_directory,
383 Sfile_name_as_directory, 1, 1, 0,
384 "Return a string representing file FILENAME interpreted as a directory.\n\
385 This operation exists because a directory is also a file, but its name as\n\
386 a directory is different from its name as a file.\n\
387 The result can be used as the value of `default-directory'\n\
388 or passed as second argument to `expand-file-name'.\n\
389 For a Unix-syntax file name, just appends a slash.\n\
390 On VMS, converts \"[X]FOO.DIR\" to \"[X.FOO]\", etc.")
391 (file)
392 Lisp_Object file;
393 {
394 char *buf;
395 Lisp_Object handler;
396
397 CHECK_STRING (file, 0);
398 if (NILP (file))
399 return Qnil;
400
401 /* If the file name has special constructs in it,
402 call the corresponding file handler. */
403 handler = Ffind_file_name_handler (file);
404 if (!NILP (handler))
405 return call2 (handler, Qfile_name_as_directory, file);
406
407 buf = (char *) alloca (XSTRING (file)->size + 10);
408 return build_string (file_name_as_directory (buf, XSTRING (file)->data));
409 }
410 \f
411 /*
412 * Convert from directory name to filename.
413 * On VMS:
414 * xyzzy:[mukesh.emacs] => xyzzy:[mukesh]emacs.dir.1
415 * xyzzy:[mukesh] => xyzzy:[000000]mukesh.dir.1
416 * On UNIX, it's simple: just make sure there is a terminating /
417
418 * Value is nonzero if the string output is different from the input.
419 */
420
421 directory_file_name (src, dst)
422 char *src, *dst;
423 {
424 long slen;
425 #ifdef VMS
426 long rlen;
427 char * ptr, * rptr;
428 char bracket;
429 struct FAB fab = cc$rms_fab;
430 struct NAM nam = cc$rms_nam;
431 char esa[NAM$C_MAXRSS];
432 #endif /* VMS */
433
434 slen = strlen (src);
435 #ifdef VMS
436 if (! index (src, '/')
437 && (src[slen - 1] == ']'
438 || src[slen - 1] == ':'
439 || src[slen - 1] == '>'))
440 {
441 /* VMS style - convert [x.y.z] to [x.y]z, [x] to [000000]x */
442 fab.fab$l_fna = src;
443 fab.fab$b_fns = slen;
444 fab.fab$l_nam = &nam;
445 fab.fab$l_fop = FAB$M_NAM;
446
447 nam.nam$l_esa = esa;
448 nam.nam$b_ess = sizeof esa;
449 nam.nam$b_nop |= NAM$M_SYNCHK;
450
451 /* We call SYS$PARSE to handle such things as [--] for us. */
452 if (SYS$PARSE(&fab, 0, 0) == RMS$_NORMAL)
453 {
454 slen = nam.nam$b_esl;
455 if (esa[slen - 1] == ';' && esa[slen - 2] == '.')
456 slen -= 2;
457 esa[slen] = '\0';
458 src = esa;
459 }
460 if (src[slen - 1] != ']' && src[slen - 1] != '>')
461 {
462 /* what about when we have logical_name:???? */
463 if (src[slen - 1] == ':')
464 { /* Xlate logical name and see what we get */
465 ptr = strcpy (dst, src); /* upper case for getenv */
466 while (*ptr)
467 {
468 if ('a' <= *ptr && *ptr <= 'z')
469 *ptr -= 040;
470 ptr++;
471 }
472 dst[slen - 1] = 0; /* remove colon */
473 if (!(src = egetenv (dst)))
474 return 0;
475 /* should we jump to the beginning of this procedure?
476 Good points: allows us to use logical names that xlate
477 to Unix names,
478 Bad points: can be a problem if we just translated to a device
479 name...
480 For now, I'll punt and always expect VMS names, and hope for
481 the best! */
482 slen = strlen (src);
483 if (src[slen - 1] != ']' && src[slen - 1] != '>')
484 { /* no recursion here! */
485 strcpy (dst, src);
486 return 0;
487 }
488 }
489 else
490 { /* not a directory spec */
491 strcpy (dst, src);
492 return 0;
493 }
494 }
495 bracket = src[slen - 1];
496
497 /* If bracket is ']' or '>', bracket - 2 is the corresponding
498 opening bracket. */
499 ptr = index (src, bracket - 2);
500 if (ptr == 0)
501 { /* no opening bracket */
502 strcpy (dst, src);
503 return 0;
504 }
505 if (!(rptr = rindex (src, '.')))
506 rptr = ptr;
507 slen = rptr - src;
508 strncpy (dst, src, slen);
509 dst[slen] = '\0';
510 if (*rptr == '.')
511 {
512 dst[slen++] = bracket;
513 dst[slen] = '\0';
514 }
515 else
516 {
517 /* If we have the top-level of a rooted directory (i.e. xx:[000000]),
518 then translate the device and recurse. */
519 if (dst[slen - 1] == ':'
520 && dst[slen - 2] != ':' /* skip decnet nodes */
521 && strcmp(src + slen, "[000000]") == 0)
522 {
523 dst[slen - 1] = '\0';
524 if ((ptr = egetenv (dst))
525 && (rlen = strlen (ptr) - 1) > 0
526 && (ptr[rlen] == ']' || ptr[rlen] == '>')
527 && ptr[rlen - 1] == '.')
528 {
529 char * buf = (char *) alloca (strlen (ptr) + 1);
530 strcpy (buf, ptr);
531 buf[rlen - 1] = ']';
532 buf[rlen] = '\0';
533 return directory_file_name (buf, dst);
534 }
535 else
536 dst[slen - 1] = ':';
537 }
538 strcat (dst, "[000000]");
539 slen += 8;
540 }
541 rptr++;
542 rlen = strlen (rptr) - 1;
543 strncat (dst, rptr, rlen);
544 dst[slen + rlen] = '\0';
545 strcat (dst, ".DIR.1");
546 return 1;
547 }
548 #endif /* VMS */
549 /* Process as Unix format: just remove any final slash.
550 But leave "/" unchanged; do not change it to "". */
551 strcpy (dst, src);
552 if (slen > 1 && dst[slen - 1] == '/')
553 dst[slen - 1] = 0;
554 return 1;
555 }
556
557 DEFUN ("directory-file-name", Fdirectory_file_name, Sdirectory_file_name,
558 1, 1, 0,
559 "Returns the file name of the directory named DIR.\n\
560 This is the name of the file that holds the data for the directory DIR.\n\
561 This operation exists because a directory is also a file, but its name as\n\
562 a directory is different from its name as a file.\n\
563 In Unix-syntax, this function just removes the final slash.\n\
564 On VMS, given a VMS-syntax directory name such as \"[X.Y]\",\n\
565 it returns a file name such as \"[X]Y.DIR.1\".")
566 (directory)
567 Lisp_Object directory;
568 {
569 char *buf;
570 Lisp_Object handler;
571
572 CHECK_STRING (directory, 0);
573
574 if (NILP (directory))
575 return Qnil;
576
577 /* If the file name has special constructs in it,
578 call the corresponding file handler. */
579 handler = Ffind_file_name_handler (directory);
580 if (!NILP (handler))
581 return call2 (handler, Qdirectory_file_name, directory);
582
583 #ifdef VMS
584 /* 20 extra chars is insufficient for VMS, since we might perform a
585 logical name translation. an equivalence string can be up to 255
586 chars long, so grab that much extra space... - sss */
587 buf = (char *) alloca (XSTRING (directory)->size + 20 + 255);
588 #else
589 buf = (char *) alloca (XSTRING (directory)->size + 20);
590 #endif
591 directory_file_name (XSTRING (directory)->data, buf);
592 return build_string (buf);
593 }
594
595 DEFUN ("make-temp-name", Fmake_temp_name, Smake_temp_name, 1, 1, 0,
596 "Generate temporary file name (string) starting with PREFIX (a string).\n\
597 The Emacs process number forms part of the result,\n\
598 so there is no danger of generating a name being used by another process.")
599 (prefix)
600 Lisp_Object prefix;
601 {
602 Lisp_Object val;
603 val = concat2 (prefix, build_string ("XXXXXX"));
604 mktemp (XSTRING (val)->data);
605 return val;
606 }
607 \f
608 DEFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
609 "Convert FILENAME to absolute, and canonicalize it.\n\
610 Second arg DEFAULT is directory to start with if FILENAME is relative\n\
611 (does not start with slash); if DEFAULT is nil or missing,\n\
612 the current buffer's value of default-directory is used.\n\
613 Path components that are `.' are removed, and \n\
614 path components followed by `..' are removed, along with the `..' itself;\n\
615 note that these simplifications are done without checking the resulting\n\
616 paths in the file system.\n\
617 An initial `~/' expands to your home directory.\n\
618 An initial `~USER/' expands to USER's home directory.\n\
619 See also the function `substitute-in-file-name'.")
620 (name, defalt)
621 Lisp_Object name, defalt;
622 {
623 unsigned char *nm;
624
625 register unsigned char *newdir, *p, *o;
626 int tlen;
627 unsigned char *target;
628 struct passwd *pw;
629 #ifdef VMS
630 unsigned char * colon = 0;
631 unsigned char * close = 0;
632 unsigned char * slash = 0;
633 unsigned char * brack = 0;
634 int lbrack = 0, rbrack = 0;
635 int dots = 0;
636 #endif /* VMS */
637 Lisp_Object handler;
638
639 CHECK_STRING (name, 0);
640
641 /* If the file name has special constructs in it,
642 call the corresponding file handler. */
643 handler = Ffind_file_name_handler (name);
644 if (!NILP (handler))
645 return call3 (handler, Qexpand_file_name, name, defalt);
646
647 /* Use the buffer's default-directory if DEFALT is omitted. */
648 if (NILP (defalt))
649 defalt = current_buffer->directory;
650 CHECK_STRING (defalt, 1);
651
652 /* Make sure DEFALT is properly expanded.
653 It would be better to do this down below where we actually use
654 defalt. Unfortunately, calling Fexpand_file_name recursively
655 could invoke GC, and the strings might be relocated. This would
656 be annoying because we have pointers into strings lying around
657 that would need adjusting, and people would add new pointers to
658 the code and forget to adjust them, resulting in intermittent bugs.
659 Putting this call here avoids all that crud.
660
661 The EQ test avoids infinite recursion. */
662 if (! NILP (defalt) && !EQ (defalt, name)
663 /* This saves time in a common case. */
664 && XSTRING (defalt)->data[0] != '/')
665 {
666 struct gcpro gcpro1;
667
668 GCPRO1 (name);
669 defalt = Fexpand_file_name (defalt, Qnil);
670 UNGCPRO;
671 }
672
673 #ifdef VMS
674 /* Filenames on VMS are always upper case. */
675 name = Fupcase (name);
676 #endif
677
678 nm = XSTRING (name)->data;
679
680 /* If nm is absolute, flush ...// and detect /./ and /../.
681 If no /./ or /../ we can return right away. */
682 if (
683 nm[0] == '/'
684 #ifdef VMS
685 || index (nm, ':')
686 #endif /* VMS */
687 )
688 {
689 /* If it turns out that the filename we want to return is just a
690 suffix of FILENAME, we don't need to go through and edit
691 things; we just need to construct a new string using data
692 starting at the middle of FILENAME. If we set lose to a
693 non-zero value, that means we've discovered that we can't do
694 that cool trick. */
695 int lose = 0;
696
697 p = nm;
698 while (*p)
699 {
700 /* Since we know the path is absolute, we can assume that each
701 element starts with a "/". */
702
703 /* "//" anywhere isn't necessarily hairy; we just start afresh
704 with the second slash. */
705 if (p[0] == '/' && p[1] == '/'
706 #ifdef APOLLO
707 /* // at start of filename is meaningful on Apollo system */
708 && nm != p
709 #endif /* APOLLO */
710 )
711 nm = p + 1;
712
713 /* "~" is hairy as the start of any path element. */
714 if (p[0] == '/' && p[1] == '~')
715 nm = p + 1, lose = 1;
716
717 /* "." and ".." are hairy. */
718 if (p[0] == '/'
719 && p[1] == '.'
720 && (p[2] == '/'
721 || p[2] == 0
722 || (p[2] == '.' && (p[3] == '/'
723 || p[3] == 0))))
724 lose = 1;
725 #ifdef VMS
726 if (p[0] == '\\')
727 lose = 1;
728 if (p[0] == '/') {
729 /* if dev:[dir]/, move nm to / */
730 if (!slash && p > nm && (brack || colon)) {
731 nm = (brack ? brack + 1 : colon + 1);
732 lbrack = rbrack = 0;
733 brack = 0;
734 colon = 0;
735 }
736 slash = p;
737 }
738 if (p[0] == '-')
739 #ifndef VMS4_4
740 /* VMS pre V4.4,convert '-'s in filenames. */
741 if (lbrack == rbrack)
742 {
743 if (dots < 2) /* this is to allow negative version numbers */
744 p[0] = '_';
745 }
746 else
747 #endif /* VMS4_4 */
748 if (lbrack > rbrack &&
749 ((p[-1] == '.' || p[-1] == '[' || p[-1] == '<') &&
750 (p[1] == '.' || p[1] == ']' || p[1] == '>')))
751 lose = 1;
752 #ifndef VMS4_4
753 else
754 p[0] = '_';
755 #endif /* VMS4_4 */
756 /* count open brackets, reset close bracket pointer */
757 if (p[0] == '[' || p[0] == '<')
758 lbrack++, brack = 0;
759 /* count close brackets, set close bracket pointer */
760 if (p[0] == ']' || p[0] == '>')
761 rbrack++, brack = p;
762 /* detect ][ or >< */
763 if ((p[0] == ']' || p[0] == '>') && (p[1] == '[' || p[1] == '<'))
764 lose = 1;
765 if ((p[0] == ':' || p[0] == ']' || p[0] == '>') && p[1] == '~')
766 nm = p + 1, lose = 1;
767 if (p[0] == ':' && (colon || slash))
768 /* if dev1:[dir]dev2:, move nm to dev2: */
769 if (brack)
770 {
771 nm = brack + 1;
772 brack = 0;
773 }
774 /* if /pathname/dev:, move nm to dev: */
775 else if (slash)
776 nm = slash + 1;
777 /* if node::dev:, move colon following dev */
778 else if (colon && colon[-1] == ':')
779 colon = p;
780 /* if dev1:dev2:, move nm to dev2: */
781 else if (colon && colon[-1] != ':')
782 {
783 nm = colon + 1;
784 colon = 0;
785 }
786 if (p[0] == ':' && !colon)
787 {
788 if (p[1] == ':')
789 p++;
790 colon = p;
791 }
792 if (lbrack == rbrack)
793 if (p[0] == ';')
794 dots = 2;
795 else if (p[0] == '.')
796 dots++;
797 #endif /* VMS */
798 p++;
799 }
800 if (!lose)
801 {
802 #ifdef VMS
803 if (index (nm, '/'))
804 return build_string (sys_translate_unix (nm));
805 #endif /* VMS */
806 if (nm == XSTRING (name)->data)
807 return name;
808 return build_string (nm);
809 }
810 }
811
812 /* Now determine directory to start with and put it in newdir */
813
814 newdir = 0;
815
816 if (nm[0] == '~') /* prefix ~ */
817 {
818 if (nm[1] == '/'
819 #ifdef VMS
820 || nm[1] == ':'
821 #endif /* VMS */
822 || nm[1] == 0) /* ~ by itself */
823 {
824 if (!(newdir = (unsigned char *) egetenv ("HOME")))
825 newdir = (unsigned char *) "";
826 nm++;
827 #ifdef VMS
828 nm++; /* Don't leave the slash in nm. */
829 #endif /* VMS */
830 }
831 else /* ~user/filename */
832 {
833 for (p = nm; *p && (*p != '/'
834 #ifdef VMS
835 && *p != ':'
836 #endif /* VMS */
837 ); p++);
838 o = (unsigned char *) alloca (p - nm + 1);
839 bcopy ((char *) nm, o, p - nm);
840 o [p - nm] = 0;
841
842 pw = (struct passwd *) getpwnam (o + 1);
843 if (pw)
844 {
845 newdir = (unsigned char *) pw -> pw_dir;
846 #ifdef VMS
847 nm = p + 1; /* skip the terminator */
848 #else
849 nm = p;
850 #endif /* VMS */
851 }
852
853 /* If we don't find a user of that name, leave the name
854 unchanged; don't move nm forward to p. */
855 }
856 }
857
858 if (nm[0] != '/'
859 #ifdef VMS
860 && !index (nm, ':')
861 #endif /* not VMS */
862 && !newdir)
863 {
864 newdir = XSTRING (defalt)->data;
865 }
866
867 if (newdir != 0)
868 {
869 /* Get rid of any slash at the end of newdir. */
870 int length = strlen (newdir);
871 /* Adding `length > 1 &&' makes ~ expand into / when homedir
872 is the root dir. People disagree about whether that is right.
873 Anyway, we can't take the risk of this change now. */
874 if (newdir[length - 1] == '/')
875 {
876 unsigned char *temp = (unsigned char *) alloca (length);
877 bcopy (newdir, temp, length - 1);
878 temp[length - 1] = 0;
879 newdir = temp;
880 }
881 tlen = length + 1;
882 }
883 else
884 tlen = 0;
885
886 /* Now concatenate the directory and name to new space in the stack frame */
887 tlen += strlen (nm) + 1;
888 target = (unsigned char *) alloca (tlen);
889 *target = 0;
890
891 if (newdir)
892 {
893 #ifndef VMS
894 if (nm[0] == 0 || nm[0] == '/')
895 strcpy (target, newdir);
896 else
897 #endif
898 file_name_as_directory (target, newdir);
899 }
900
901 strcat (target, nm);
902 #ifdef VMS
903 if (index (target, '/'))
904 strcpy (target, sys_translate_unix (target));
905 #endif /* VMS */
906
907 /* Now canonicalize by removing /. and /foo/.. if they appear. */
908
909 p = target;
910 o = target;
911
912 while (*p)
913 {
914 #ifdef VMS
915 if (*p != ']' && *p != '>' && *p != '-')
916 {
917 if (*p == '\\')
918 p++;
919 *o++ = *p++;
920 }
921 else if ((p[0] == ']' || p[0] == '>') && p[0] == p[1] + 2)
922 /* brackets are offset from each other by 2 */
923 {
924 p += 2;
925 if (*p != '.' && *p != '-' && o[-1] != '.')
926 /* convert [foo][bar] to [bar] */
927 while (o[-1] != '[' && o[-1] != '<')
928 o--;
929 else if (*p == '-' && *o != '.')
930 *--p = '.';
931 }
932 else if (p[0] == '-' && o[-1] == '.' &&
933 (p[1] == '.' || p[1] == ']' || p[1] == '>'))
934 /* flush .foo.- ; leave - if stopped by '[' or '<' */
935 {
936 do
937 o--;
938 while (o[-1] != '.' && o[-1] != '[' && o[-1] != '<');
939 if (p[1] == '.') /* foo.-.bar ==> bar*/
940 p += 2;
941 else if (o[-1] == '.') /* '.foo.-]' ==> ']' */
942 p++, o--;
943 /* else [foo.-] ==> [-] */
944 }
945 else
946 {
947 #ifndef VMS4_4
948 if (*p == '-' &&
949 o[-1] != '[' && o[-1] != '<' && o[-1] != '.' &&
950 p[1] != ']' && p[1] != '>' && p[1] != '.')
951 *p = '_';
952 #endif /* VMS4_4 */
953 *o++ = *p++;
954 }
955 #else /* not VMS */
956 if (*p != '/')
957 {
958 *o++ = *p++;
959 }
960 else if (!strncmp (p, "//", 2)
961 #ifdef APOLLO
962 /* // at start of filename is meaningful in Apollo system */
963 && o != target
964 #endif /* APOLLO */
965 )
966 {
967 o = target;
968 p++;
969 }
970 else if (p[0] == '/'
971 && p[1] == '.'
972 && (p[2] == '/'
973 || p[2] == 0))
974 {
975 /* If "/." is the entire filename, keep the "/". Otherwise,
976 just delete the whole "/.". */
977 if (o == target && p[2] == '\0')
978 *o++ = *p;
979 p += 2;
980 }
981 else if (!strncmp (p, "/..", 3)
982 /* `/../' is the "superroot" on certain file systems. */
983 && o != target
984 && (p[3] == '/' || p[3] == 0))
985 {
986 while (o != target && *--o != '/')
987 ;
988 #ifdef APOLLO
989 if (o == target + 1 && o[-1] == '/' && o[0] == '/')
990 ++o;
991 else
992 #endif /* APOLLO */
993 if (o == target && *o == '/')
994 ++o;
995 p += 3;
996 }
997 else
998 {
999 *o++ = *p++;
1000 }
1001 #endif /* not VMS */
1002 }
1003
1004 return make_string (target, o - target);
1005 }
1006 #if 0
1007 /* Changed this DEFUN to a DEAFUN, so as not to confuse `make-docfile'.
1008 DEAFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
1009 "Convert FILENAME to absolute, and canonicalize it.\n\
1010 Second arg DEFAULT is directory to start with if FILENAME is relative\n\
1011 (does not start with slash); if DEFAULT is nil or missing,\n\
1012 the current buffer's value of default-directory is used.\n\
1013 Filenames containing `.' or `..' as components are simplified;\n\
1014 initial `~/' expands to your home directory.\n\
1015 See also the function `substitute-in-file-name'.")
1016 (name, defalt)
1017 Lisp_Object name, defalt;
1018 {
1019 unsigned char *nm;
1020
1021 register unsigned char *newdir, *p, *o;
1022 int tlen;
1023 unsigned char *target;
1024 struct passwd *pw;
1025 int lose;
1026 #ifdef VMS
1027 unsigned char * colon = 0;
1028 unsigned char * close = 0;
1029 unsigned char * slash = 0;
1030 unsigned char * brack = 0;
1031 int lbrack = 0, rbrack = 0;
1032 int dots = 0;
1033 #endif /* VMS */
1034
1035 CHECK_STRING (name, 0);
1036
1037 #ifdef VMS
1038 /* Filenames on VMS are always upper case. */
1039 name = Fupcase (name);
1040 #endif
1041
1042 nm = XSTRING (name)->data;
1043
1044 /* If nm is absolute, flush ...// and detect /./ and /../.
1045 If no /./ or /../ we can return right away. */
1046 if (
1047 nm[0] == '/'
1048 #ifdef VMS
1049 || index (nm, ':')
1050 #endif /* VMS */
1051 )
1052 {
1053 p = nm;
1054 lose = 0;
1055 while (*p)
1056 {
1057 if (p[0] == '/' && p[1] == '/'
1058 #ifdef APOLLO
1059 /* // at start of filename is meaningful on Apollo system */
1060 && nm != p
1061 #endif /* APOLLO */
1062 )
1063 nm = p + 1;
1064 if (p[0] == '/' && p[1] == '~')
1065 nm = p + 1, lose = 1;
1066 if (p[0] == '/' && p[1] == '.'
1067 && (p[2] == '/' || p[2] == 0
1068 || (p[2] == '.' && (p[3] == '/' || p[3] == 0))))
1069 lose = 1;
1070 #ifdef VMS
1071 if (p[0] == '\\')
1072 lose = 1;
1073 if (p[0] == '/') {
1074 /* if dev:[dir]/, move nm to / */
1075 if (!slash && p > nm && (brack || colon)) {
1076 nm = (brack ? brack + 1 : colon + 1);
1077 lbrack = rbrack = 0;
1078 brack = 0;
1079 colon = 0;
1080 }
1081 slash = p;
1082 }
1083 if (p[0] == '-')
1084 #ifndef VMS4_4
1085 /* VMS pre V4.4,convert '-'s in filenames. */
1086 if (lbrack == rbrack)
1087 {
1088 if (dots < 2) /* this is to allow negative version numbers */
1089 p[0] = '_';
1090 }
1091 else
1092 #endif /* VMS4_4 */
1093 if (lbrack > rbrack &&
1094 ((p[-1] == '.' || p[-1] == '[' || p[-1] == '<') &&
1095 (p[1] == '.' || p[1] == ']' || p[1] == '>')))
1096 lose = 1;
1097 #ifndef VMS4_4
1098 else
1099 p[0] = '_';
1100 #endif /* VMS4_4 */
1101 /* count open brackets, reset close bracket pointer */
1102 if (p[0] == '[' || p[0] == '<')
1103 lbrack++, brack = 0;
1104 /* count close brackets, set close bracket pointer */
1105 if (p[0] == ']' || p[0] == '>')
1106 rbrack++, brack = p;
1107 /* detect ][ or >< */
1108 if ((p[0] == ']' || p[0] == '>') && (p[1] == '[' || p[1] == '<'))
1109 lose = 1;
1110 if ((p[0] == ':' || p[0] == ']' || p[0] == '>') && p[1] == '~')
1111 nm = p + 1, lose = 1;
1112 if (p[0] == ':' && (colon || slash))
1113 /* if dev1:[dir]dev2:, move nm to dev2: */
1114 if (brack)
1115 {
1116 nm = brack + 1;
1117 brack = 0;
1118 }
1119 /* if /pathname/dev:, move nm to dev: */
1120 else if (slash)
1121 nm = slash + 1;
1122 /* if node::dev:, move colon following dev */
1123 else if (colon && colon[-1] == ':')
1124 colon = p;
1125 /* if dev1:dev2:, move nm to dev2: */
1126 else if (colon && colon[-1] != ':')
1127 {
1128 nm = colon + 1;
1129 colon = 0;
1130 }
1131 if (p[0] == ':' && !colon)
1132 {
1133 if (p[1] == ':')
1134 p++;
1135 colon = p;
1136 }
1137 if (lbrack == rbrack)
1138 if (p[0] == ';')
1139 dots = 2;
1140 else if (p[0] == '.')
1141 dots++;
1142 #endif /* VMS */
1143 p++;
1144 }
1145 if (!lose)
1146 {
1147 #ifdef VMS
1148 if (index (nm, '/'))
1149 return build_string (sys_translate_unix (nm));
1150 #endif /* VMS */
1151 if (nm == XSTRING (name)->data)
1152 return name;
1153 return build_string (nm);
1154 }
1155 }
1156
1157 /* Now determine directory to start with and put it in NEWDIR */
1158
1159 newdir = 0;
1160
1161 if (nm[0] == '~') /* prefix ~ */
1162 if (nm[1] == '/'
1163 #ifdef VMS
1164 || nm[1] == ':'
1165 #endif /* VMS */
1166 || nm[1] == 0)/* ~/filename */
1167 {
1168 if (!(newdir = (unsigned char *) egetenv ("HOME")))
1169 newdir = (unsigned char *) "";
1170 nm++;
1171 #ifdef VMS
1172 nm++; /* Don't leave the slash in nm. */
1173 #endif /* VMS */
1174 }
1175 else /* ~user/filename */
1176 {
1177 /* Get past ~ to user */
1178 unsigned char *user = nm + 1;
1179 /* Find end of name. */
1180 unsigned char *ptr = (unsigned char *) index (user, '/');
1181 int len = ptr ? ptr - user : strlen (user);
1182 #ifdef VMS
1183 unsigned char *ptr1 = index (user, ':');
1184 if (ptr1 != 0 && ptr1 - user < len)
1185 len = ptr1 - user;
1186 #endif /* VMS */
1187 /* Copy the user name into temp storage. */
1188 o = (unsigned char *) alloca (len + 1);
1189 bcopy ((char *) user, o, len);
1190 o[len] = 0;
1191
1192 /* Look up the user name. */
1193 pw = (struct passwd *) getpwnam (o + 1);
1194 if (!pw)
1195 error ("\"%s\" isn't a registered user", o + 1);
1196
1197 newdir = (unsigned char *) pw->pw_dir;
1198
1199 /* Discard the user name from NM. */
1200 nm += len;
1201 }
1202
1203 if (nm[0] != '/'
1204 #ifdef VMS
1205 && !index (nm, ':')
1206 #endif /* not VMS */
1207 && !newdir)
1208 {
1209 if (NILP (defalt))
1210 defalt = current_buffer->directory;
1211 CHECK_STRING (defalt, 1);
1212 newdir = XSTRING (defalt)->data;
1213 }
1214
1215 /* Now concatenate the directory and name to new space in the stack frame */
1216
1217 tlen = (newdir ? strlen (newdir) + 1 : 0) + strlen (nm) + 1;
1218 target = (unsigned char *) alloca (tlen);
1219 *target = 0;
1220
1221 if (newdir)
1222 {
1223 #ifndef VMS
1224 if (nm[0] == 0 || nm[0] == '/')
1225 strcpy (target, newdir);
1226 else
1227 #endif
1228 file_name_as_directory (target, newdir);
1229 }
1230
1231 strcat (target, nm);
1232 #ifdef VMS
1233 if (index (target, '/'))
1234 strcpy (target, sys_translate_unix (target));
1235 #endif /* VMS */
1236
1237 /* Now canonicalize by removing /. and /foo/.. if they appear */
1238
1239 p = target;
1240 o = target;
1241
1242 while (*p)
1243 {
1244 #ifdef VMS
1245 if (*p != ']' && *p != '>' && *p != '-')
1246 {
1247 if (*p == '\\')
1248 p++;
1249 *o++ = *p++;
1250 }
1251 else if ((p[0] == ']' || p[0] == '>') && p[0] == p[1] + 2)
1252 /* brackets are offset from each other by 2 */
1253 {
1254 p += 2;
1255 if (*p != '.' && *p != '-' && o[-1] != '.')
1256 /* convert [foo][bar] to [bar] */
1257 while (o[-1] != '[' && o[-1] != '<')
1258 o--;
1259 else if (*p == '-' && *o != '.')
1260 *--p = '.';
1261 }
1262 else if (p[0] == '-' && o[-1] == '.' &&
1263 (p[1] == '.' || p[1] == ']' || p[1] == '>'))
1264 /* flush .foo.- ; leave - if stopped by '[' or '<' */
1265 {
1266 do
1267 o--;
1268 while (o[-1] != '.' && o[-1] != '[' && o[-1] != '<');
1269 if (p[1] == '.') /* foo.-.bar ==> bar*/
1270 p += 2;
1271 else if (o[-1] == '.') /* '.foo.-]' ==> ']' */
1272 p++, o--;
1273 /* else [foo.-] ==> [-] */
1274 }
1275 else
1276 {
1277 #ifndef VMS4_4
1278 if (*p == '-' &&
1279 o[-1] != '[' && o[-1] != '<' && o[-1] != '.' &&
1280 p[1] != ']' && p[1] != '>' && p[1] != '.')
1281 *p = '_';
1282 #endif /* VMS4_4 */
1283 *o++ = *p++;
1284 }
1285 #else /* not VMS */
1286 if (*p != '/')
1287 {
1288 *o++ = *p++;
1289 }
1290 else if (!strncmp (p, "//", 2)
1291 #ifdef APOLLO
1292 /* // at start of filename is meaningful in Apollo system */
1293 && o != target
1294 #endif /* APOLLO */
1295 )
1296 {
1297 o = target;
1298 p++;
1299 }
1300 else if (p[0] == '/' && p[1] == '.' &&
1301 (p[2] == '/' || p[2] == 0))
1302 p += 2;
1303 else if (!strncmp (p, "/..", 3)
1304 /* `/../' is the "superroot" on certain file systems. */
1305 && o != target
1306 && (p[3] == '/' || p[3] == 0))
1307 {
1308 while (o != target && *--o != '/')
1309 ;
1310 #ifdef APOLLO
1311 if (o == target + 1 && o[-1] == '/' && o[0] == '/')
1312 ++o;
1313 else
1314 #endif /* APOLLO */
1315 if (o == target && *o == '/')
1316 ++o;
1317 p += 3;
1318 }
1319 else
1320 {
1321 *o++ = *p++;
1322 }
1323 #endif /* not VMS */
1324 }
1325
1326 return make_string (target, o - target);
1327 }
1328 #endif
1329 \f
1330 DEFUN ("substitute-in-file-name", Fsubstitute_in_file_name,
1331 Ssubstitute_in_file_name, 1, 1, 0,
1332 "Substitute environment variables referred to in FILENAME.\n\
1333 `$FOO' where FOO is an environment variable name means to substitute\n\
1334 the value of that variable. The variable name should be terminated\n\
1335 with a character not a letter, digit or underscore; otherwise, enclose\n\
1336 the entire variable name in braces.\n\
1337 If `/~' appears, all of FILENAME through that `/' is discarded.\n\n\
1338 On VMS, `$' substitution is not done; this function does little and only\n\
1339 duplicates what `expand-file-name' does.")
1340 (string)
1341 Lisp_Object string;
1342 {
1343 unsigned char *nm;
1344
1345 register unsigned char *s, *p, *o, *x, *endp;
1346 unsigned char *target;
1347 int total = 0;
1348 int substituted = 0;
1349 unsigned char *xnm;
1350
1351 CHECK_STRING (string, 0);
1352
1353 nm = XSTRING (string)->data;
1354 endp = nm + XSTRING (string)->size;
1355
1356 /* If /~ or // appears, discard everything through first slash. */
1357
1358 for (p = nm; p != endp; p++)
1359 {
1360 if ((p[0] == '~' ||
1361 #ifdef APOLLO
1362 /* // at start of file name is meaningful in Apollo system */
1363 (p[0] == '/' && p - 1 != nm)
1364 #else /* not APOLLO */
1365 p[0] == '/'
1366 #endif /* not APOLLO */
1367 )
1368 && p != nm &&
1369 #ifdef VMS
1370 (p[-1] == ':' || p[-1] == ']' || p[-1] == '>' ||
1371 #endif /* VMS */
1372 p[-1] == '/')
1373 #ifdef VMS
1374 )
1375 #endif /* VMS */
1376 {
1377 nm = p;
1378 substituted = 1;
1379 }
1380 }
1381
1382 #ifdef VMS
1383 return build_string (nm);
1384 #else
1385
1386 /* See if any variables are substituted into the string
1387 and find the total length of their values in `total' */
1388
1389 for (p = nm; p != endp;)
1390 if (*p != '$')
1391 p++;
1392 else
1393 {
1394 p++;
1395 if (p == endp)
1396 goto badsubst;
1397 else if (*p == '$')
1398 {
1399 /* "$$" means a single "$" */
1400 p++;
1401 total -= 1;
1402 substituted = 1;
1403 continue;
1404 }
1405 else if (*p == '{')
1406 {
1407 o = ++p;
1408 while (p != endp && *p != '}') p++;
1409 if (*p != '}') goto missingclose;
1410 s = p;
1411 }
1412 else
1413 {
1414 o = p;
1415 while (p != endp && (isalnum (*p) || *p == '_')) p++;
1416 s = p;
1417 }
1418
1419 /* Copy out the variable name */
1420 target = (unsigned char *) alloca (s - o + 1);
1421 strncpy (target, o, s - o);
1422 target[s - o] = 0;
1423
1424 /* Get variable value */
1425 o = (unsigned char *) egetenv (target);
1426 /* The presence of this code makes vax 5.0 crash, for reasons yet unknown */
1427 #if 0
1428 #ifdef USG
1429 if (!o && !strcmp (target, "USER"))
1430 o = egetenv ("LOGNAME");
1431 #endif /* USG */
1432 #endif /* 0 */
1433 if (!o) goto badvar;
1434 total += strlen (o);
1435 substituted = 1;
1436 }
1437
1438 if (!substituted)
1439 return string;
1440
1441 /* If substitution required, recopy the string and do it */
1442 /* Make space in stack frame for the new copy */
1443 xnm = (unsigned char *) alloca (XSTRING (string)->size + total + 1);
1444 x = xnm;
1445
1446 /* Copy the rest of the name through, replacing $ constructs with values */
1447 for (p = nm; *p;)
1448 if (*p != '$')
1449 *x++ = *p++;
1450 else
1451 {
1452 p++;
1453 if (p == endp)
1454 goto badsubst;
1455 else if (*p == '$')
1456 {
1457 *x++ = *p++;
1458 continue;
1459 }
1460 else if (*p == '{')
1461 {
1462 o = ++p;
1463 while (p != endp && *p != '}') p++;
1464 if (*p != '}') goto missingclose;
1465 s = p++;
1466 }
1467 else
1468 {
1469 o = p;
1470 while (p != endp && (isalnum (*p) || *p == '_')) p++;
1471 s = p;
1472 }
1473
1474 /* Copy out the variable name */
1475 target = (unsigned char *) alloca (s - o + 1);
1476 strncpy (target, o, s - o);
1477 target[s - o] = 0;
1478
1479 /* Get variable value */
1480 o = (unsigned char *) egetenv (target);
1481 /* The presence of this code makes vax 5.0 crash, for reasons yet unknown */
1482 #if 0
1483 #ifdef USG
1484 if (!o && !strcmp (target, "USER"))
1485 o = egetenv ("LOGNAME");
1486 #endif /* USG */
1487 #endif /* 0 */
1488 if (!o)
1489 goto badvar;
1490
1491 strcpy (x, o);
1492 x += strlen (o);
1493 }
1494
1495 *x = 0;
1496
1497 /* If /~ or // appears, discard everything through first slash. */
1498
1499 for (p = xnm; p != x; p++)
1500 if ((p[0] == '~' ||
1501 #ifdef APOLLO
1502 /* // at start of file name is meaningful in Apollo system */
1503 (p[0] == '/' && p - 1 != xnm)
1504 #else /* not APOLLO */
1505 p[0] == '/'
1506 #endif /* not APOLLO */
1507 )
1508 && p != nm && p[-1] == '/')
1509 xnm = p;
1510
1511 return make_string (xnm, x - xnm);
1512
1513 badsubst:
1514 error ("Bad format environment-variable substitution");
1515 missingclose:
1516 error ("Missing \"}\" in environment-variable substitution");
1517 badvar:
1518 error ("Substituting nonexistent environment variable \"%s\"", target);
1519
1520 /* NOTREACHED */
1521 #endif /* not VMS */
1522 }
1523 \f
1524 /* A slightly faster and more convenient way to get
1525 (directory-file-name (expand-file-name FOO)). */
1526
1527 Lisp_Object
1528 expand_and_dir_to_file (filename, defdir)
1529 Lisp_Object filename, defdir;
1530 {
1531 register Lisp_Object abspath;
1532
1533 abspath = Fexpand_file_name (filename, defdir);
1534 #ifdef VMS
1535 {
1536 register int c = XSTRING (abspath)->data[XSTRING (abspath)->size - 1];
1537 if (c == ':' || c == ']' || c == '>')
1538 abspath = Fdirectory_file_name (abspath);
1539 }
1540 #else
1541 /* Remove final slash, if any (unless path is root).
1542 stat behaves differently depending! */
1543 if (XSTRING (abspath)->size > 1
1544 && XSTRING (abspath)->data[XSTRING (abspath)->size - 1] == '/')
1545 /* We cannot take shortcuts; they might be wrong for magic file names. */
1546 abspath = Fdirectory_file_name (abspath);
1547 #endif
1548 return abspath;
1549 }
1550 \f
1551 barf_or_query_if_file_exists (absname, querystring, interactive)
1552 Lisp_Object absname;
1553 unsigned char *querystring;
1554 int interactive;
1555 {
1556 register Lisp_Object tem;
1557 struct gcpro gcpro1;
1558
1559 if (access (XSTRING (absname)->data, 4) >= 0)
1560 {
1561 if (! interactive)
1562 Fsignal (Qfile_already_exists,
1563 Fcons (build_string ("File already exists"),
1564 Fcons (absname, Qnil)));
1565 GCPRO1 (absname);
1566 tem = do_yes_or_no_p (format1 ("File %s already exists; %s anyway? ",
1567 XSTRING (absname)->data, querystring));
1568 UNGCPRO;
1569 if (NILP (tem))
1570 Fsignal (Qfile_already_exists,
1571 Fcons (build_string ("File already exists"),
1572 Fcons (absname, Qnil)));
1573 }
1574 return;
1575 }
1576
1577 DEFUN ("copy-file", Fcopy_file, Scopy_file, 2, 4,
1578 "fCopy file: \nFCopy %s to file: \np\nP",
1579 "Copy FILE to NEWNAME. Both args must be strings.\n\
1580 Signals a `file-already-exists' error if file NEWNAME already exists,\n\
1581 unless a third argument OK-IF-ALREADY-EXISTS is supplied and non-nil.\n\
1582 A number as third arg means request confirmation if NEWNAME already exists.\n\
1583 This is what happens in interactive use with M-x.\n\
1584 Fourth arg KEEP-TIME non-nil means give the new file the same\n\
1585 last-modified time as the old one. (This works on only some systems.)\n\
1586 A prefix arg makes KEEP-TIME non-nil.")
1587 (filename, newname, ok_if_already_exists, keep_date)
1588 Lisp_Object filename, newname, ok_if_already_exists, keep_date;
1589 {
1590 int ifd, ofd, n;
1591 char buf[16 * 1024];
1592 struct stat st;
1593 Lisp_Object handler;
1594 struct gcpro gcpro1, gcpro2;
1595 int count = specpdl_ptr - specpdl;
1596 Lisp_Object args[6];
1597 int input_file_statable_p;
1598
1599 GCPRO2 (filename, newname);
1600 CHECK_STRING (filename, 0);
1601 CHECK_STRING (newname, 1);
1602 filename = Fexpand_file_name (filename, Qnil);
1603 newname = Fexpand_file_name (newname, Qnil);
1604
1605 /* If the input file name has special constructs in it,
1606 call the corresponding file handler. */
1607 handler = Ffind_file_name_handler (filename);
1608 /* Likewise for output file name. */
1609 if (NILP (handler))
1610 handler = Ffind_file_name_handler (newname);
1611 if (!NILP (handler))
1612 return call5 (handler, Qcopy_file, filename, newname,
1613 ok_if_already_exists, keep_date);
1614
1615 if (NILP (ok_if_already_exists)
1616 || XTYPE (ok_if_already_exists) == Lisp_Int)
1617 barf_or_query_if_file_exists (newname, "copy to it",
1618 XTYPE (ok_if_already_exists) == Lisp_Int);
1619
1620 ifd = open (XSTRING (filename)->data, 0);
1621 if (ifd < 0)
1622 report_file_error ("Opening input file", Fcons (filename, Qnil));
1623
1624 record_unwind_protect (close_file_unwind, make_number (ifd));
1625
1626 /* We can only copy regular files and symbolic links. Other files are not
1627 copyable by us. */
1628 input_file_statable_p = (fstat (ifd, &st) >= 0);
1629
1630 #if defined (S_ISREG) && defined (S_ISLNK)
1631 if (input_file_statable_p)
1632 {
1633 if (!(S_ISREG (st.st_mode)) && !(S_ISLNK (st.st_mode)))
1634 {
1635 #if defined (EISDIR)
1636 /* Get a better looking error message. */
1637 errno = EISDIR;
1638 #endif /* EISDIR */
1639 report_file_error ("Non-regular file", Fcons (filename, Qnil));
1640 }
1641 }
1642 #endif /* S_ISREG && S_ISLNK */
1643
1644 #ifdef VMS
1645 /* Create the copy file with the same record format as the input file */
1646 ofd = sys_creat (XSTRING (newname)->data, 0666, ifd);
1647 #else
1648 ofd = creat (XSTRING (newname)->data, 0666);
1649 #endif /* VMS */
1650 if (ofd < 0)
1651 report_file_error ("Opening output file", Fcons (newname, Qnil));
1652
1653 record_unwind_protect (close_file_unwind, make_number (ofd));
1654
1655 immediate_quit = 1;
1656 QUIT;
1657 while ((n = read (ifd, buf, sizeof buf)) > 0)
1658 if (write (ofd, buf, n) != n)
1659 report_file_error ("I/O error", Fcons (newname, Qnil));
1660 immediate_quit = 0;
1661
1662 if (input_file_statable_p)
1663 {
1664 if (!NILP (keep_date))
1665 {
1666 EMACS_TIME atime, mtime;
1667 EMACS_SET_SECS_USECS (atime, st.st_atime, 0);
1668 EMACS_SET_SECS_USECS (mtime, st.st_mtime, 0);
1669 EMACS_SET_UTIMES (XSTRING (newname)->data, atime, mtime);
1670 }
1671 #ifdef APOLLO
1672 if (!egetenv ("USE_DOMAIN_ACLS"))
1673 #endif
1674 chmod (XSTRING (newname)->data, st.st_mode & 07777);
1675 }
1676
1677 /* Discard the unwind protects. */
1678 specpdl_ptr = specpdl + count;
1679
1680 close (ifd);
1681 if (close (ofd) < 0)
1682 report_file_error ("I/O error", Fcons (newname, Qnil));
1683
1684 UNGCPRO;
1685 return Qnil;
1686 }
1687
1688 DEFUN ("make-directory-internal", Fmake_directory_internal,
1689 Smake_directory_internal, 1, 1, 0,
1690 "Create a directory. One argument, a file name string.")
1691 (dirname)
1692 Lisp_Object dirname;
1693 {
1694 unsigned char *dir;
1695 Lisp_Object handler;
1696
1697 CHECK_STRING (dirname, 0);
1698 dirname = Fexpand_file_name (dirname, Qnil);
1699
1700 handler = Ffind_file_name_handler (dirname);
1701 if (!NILP (handler))
1702 return call3 (handler, Qmake_directory, dirname, Qnil);
1703
1704 dir = XSTRING (dirname)->data;
1705
1706 if (mkdir (dir, 0777) != 0)
1707 report_file_error ("Creating directory", Flist (1, &dirname));
1708
1709 return Qnil;
1710 }
1711
1712 DEFUN ("delete-directory", Fdelete_directory, Sdelete_directory, 1, 1, "FDelete directory: ",
1713 "Delete a directory. One argument, a file name string.")
1714 (dirname)
1715 Lisp_Object dirname;
1716 {
1717 unsigned char *dir;
1718 Lisp_Object handler;
1719
1720 CHECK_STRING (dirname, 0);
1721 dirname = Fexpand_file_name (dirname, Qnil);
1722 dir = XSTRING (dirname)->data;
1723
1724 handler = Ffind_file_name_handler (dirname);
1725 if (!NILP (handler))
1726 return call2 (handler, Qdelete_directory, dirname);
1727
1728 if (rmdir (dir) != 0)
1729 report_file_error ("Removing directory", Flist (1, &dirname));
1730
1731 return Qnil;
1732 }
1733
1734 DEFUN ("delete-file", Fdelete_file, Sdelete_file, 1, 1, "fDelete file: ",
1735 "Delete specified file. One argument, a file name string.\n\
1736 If file has multiple names, it continues to exist with the other names.")
1737 (filename)
1738 Lisp_Object filename;
1739 {
1740 Lisp_Object handler;
1741 CHECK_STRING (filename, 0);
1742 filename = Fexpand_file_name (filename, Qnil);
1743
1744 handler = Ffind_file_name_handler (filename);
1745 if (!NILP (handler))
1746 return call2 (handler, Qdelete_file, filename);
1747
1748 if (0 > unlink (XSTRING (filename)->data))
1749 report_file_error ("Removing old name", Flist (1, &filename));
1750 return Qnil;
1751 }
1752
1753 DEFUN ("rename-file", Frename_file, Srename_file, 2, 3,
1754 "fRename file: \nFRename %s to file: \np",
1755 "Rename FILE as NEWNAME. Both args strings.\n\
1756 If file has names other than FILE, it continues to have those names.\n\
1757 Signals a `file-already-exists' error if a file NEWNAME already exists\n\
1758 unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.\n\
1759 A number as third arg means request confirmation if NEWNAME already exists.\n\
1760 This is what happens in interactive use with M-x.")
1761 (filename, newname, ok_if_already_exists)
1762 Lisp_Object filename, newname, ok_if_already_exists;
1763 {
1764 #ifdef NO_ARG_ARRAY
1765 Lisp_Object args[2];
1766 #endif
1767 Lisp_Object handler;
1768 struct gcpro gcpro1, gcpro2;
1769
1770 GCPRO2 (filename, newname);
1771 CHECK_STRING (filename, 0);
1772 CHECK_STRING (newname, 1);
1773 filename = Fexpand_file_name (filename, Qnil);
1774 newname = Fexpand_file_name (newname, Qnil);
1775
1776 /* If the file name has special constructs in it,
1777 call the corresponding file handler. */
1778 handler = Ffind_file_name_handler (filename);
1779 if (NILP (handler))
1780 handler = Ffind_file_name_handler (newname);
1781 if (!NILP (handler))
1782 return call4 (handler, Qrename_file,
1783 filename, newname, ok_if_already_exists);
1784
1785 if (NILP (ok_if_already_exists)
1786 || XTYPE (ok_if_already_exists) == Lisp_Int)
1787 barf_or_query_if_file_exists (newname, "rename to it",
1788 XTYPE (ok_if_already_exists) == Lisp_Int);
1789 #ifndef BSD4_1
1790 if (0 > rename (XSTRING (filename)->data, XSTRING (newname)->data))
1791 #else
1792 if (0 > link (XSTRING (filename)->data, XSTRING (newname)->data)
1793 || 0 > unlink (XSTRING (filename)->data))
1794 #endif
1795 {
1796 if (errno == EXDEV)
1797 {
1798 Fcopy_file (filename, newname,
1799 /* We have already prompted if it was an integer,
1800 so don't have copy-file prompt again. */
1801 NILP (ok_if_already_exists) ? Qnil : Qt, Qt);
1802 Fdelete_file (filename);
1803 }
1804 else
1805 #ifdef NO_ARG_ARRAY
1806 {
1807 args[0] = filename;
1808 args[1] = newname;
1809 report_file_error ("Renaming", Flist (2, args));
1810 }
1811 #else
1812 report_file_error ("Renaming", Flist (2, &filename));
1813 #endif
1814 }
1815 UNGCPRO;
1816 return Qnil;
1817 }
1818
1819 DEFUN ("add-name-to-file", Fadd_name_to_file, Sadd_name_to_file, 2, 3,
1820 "fAdd name to file: \nFName to add to %s: \np",
1821 "Give FILE additional name NEWNAME. Both args strings.\n\
1822 Signals a `file-already-exists' error if a file NEWNAME already exists\n\
1823 unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.\n\
1824 A number as third arg means request confirmation if NEWNAME already exists.\n\
1825 This is what happens in interactive use with M-x.")
1826 (filename, newname, ok_if_already_exists)
1827 Lisp_Object filename, newname, ok_if_already_exists;
1828 {
1829 #ifdef NO_ARG_ARRAY
1830 Lisp_Object args[2];
1831 #endif
1832 Lisp_Object handler;
1833 struct gcpro gcpro1, gcpro2;
1834
1835 GCPRO2 (filename, newname);
1836 CHECK_STRING (filename, 0);
1837 CHECK_STRING (newname, 1);
1838 filename = Fexpand_file_name (filename, Qnil);
1839 newname = Fexpand_file_name (newname, Qnil);
1840
1841 /* If the file name has special constructs in it,
1842 call the corresponding file handler. */
1843 handler = Ffind_file_name_handler (filename);
1844 if (!NILP (handler))
1845 return call4 (handler, Qadd_name_to_file, filename, newname,
1846 ok_if_already_exists);
1847
1848 if (NILP (ok_if_already_exists)
1849 || XTYPE (ok_if_already_exists) == Lisp_Int)
1850 barf_or_query_if_file_exists (newname, "make it a new name",
1851 XTYPE (ok_if_already_exists) == Lisp_Int);
1852 unlink (XSTRING (newname)->data);
1853 if (0 > link (XSTRING (filename)->data, XSTRING (newname)->data))
1854 {
1855 #ifdef NO_ARG_ARRAY
1856 args[0] = filename;
1857 args[1] = newname;
1858 report_file_error ("Adding new name", Flist (2, args));
1859 #else
1860 report_file_error ("Adding new name", Flist (2, &filename));
1861 #endif
1862 }
1863
1864 UNGCPRO;
1865 return Qnil;
1866 }
1867
1868 #ifdef S_IFLNK
1869 DEFUN ("make-symbolic-link", Fmake_symbolic_link, Smake_symbolic_link, 2, 3,
1870 "FMake symbolic link to file: \nFMake symbolic link to file %s: \np",
1871 "Make a symbolic link to FILENAME, named LINKNAME. Both args strings.\n\
1872 Signals a `file-already-exists' error if a file NEWNAME already exists\n\
1873 unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.\n\
1874 A number as third arg means request confirmation if NEWNAME already exists.\n\
1875 This happens for interactive use with M-x.")
1876 (filename, linkname, ok_if_already_exists)
1877 Lisp_Object filename, linkname, ok_if_already_exists;
1878 {
1879 #ifdef NO_ARG_ARRAY
1880 Lisp_Object args[2];
1881 #endif
1882 Lisp_Object handler;
1883 struct gcpro gcpro1, gcpro2;
1884
1885 GCPRO2 (filename, linkname);
1886 CHECK_STRING (filename, 0);
1887 CHECK_STRING (linkname, 1);
1888 /* If the link target has a ~, we must expand it to get
1889 a truly valid file name. Otherwise, do not expand;
1890 we want to permit links to relative file names. */
1891 if (XSTRING (filename)->data[0] == '~')
1892 filename = Fexpand_file_name (filename, Qnil);
1893 linkname = Fexpand_file_name (linkname, Qnil);
1894
1895 /* If the file name has special constructs in it,
1896 call the corresponding file handler. */
1897 handler = Ffind_file_name_handler (filename);
1898 if (!NILP (handler))
1899 return call4 (handler, Qmake_symbolic_link, filename, linkname,
1900 ok_if_already_exists);
1901
1902 if (NILP (ok_if_already_exists)
1903 || XTYPE (ok_if_already_exists) == Lisp_Int)
1904 barf_or_query_if_file_exists (linkname, "make it a link",
1905 XTYPE (ok_if_already_exists) == Lisp_Int);
1906 if (0 > symlink (XSTRING (filename)->data, XSTRING (linkname)->data))
1907 {
1908 /* If we didn't complain already, silently delete existing file. */
1909 if (errno == EEXIST)
1910 {
1911 unlink (XSTRING (linkname)->data);
1912 if (0 <= symlink (XSTRING (filename)->data, XSTRING (linkname)->data))
1913 return Qnil;
1914 }
1915
1916 #ifdef NO_ARG_ARRAY
1917 args[0] = filename;
1918 args[1] = linkname;
1919 report_file_error ("Making symbolic link", Flist (2, args));
1920 #else
1921 report_file_error ("Making symbolic link", Flist (2, &filename));
1922 #endif
1923 }
1924 UNGCPRO;
1925 return Qnil;
1926 }
1927 #endif /* S_IFLNK */
1928
1929 #ifdef VMS
1930
1931 DEFUN ("define-logical-name", Fdefine_logical_name, Sdefine_logical_name,
1932 2, 2, "sDefine logical name: \nsDefine logical name %s as: ",
1933 "Define the job-wide logical name NAME to have the value STRING.\n\
1934 If STRING is nil or a null string, the logical name NAME is deleted.")
1935 (varname, string)
1936 Lisp_Object varname;
1937 Lisp_Object string;
1938 {
1939 CHECK_STRING (varname, 0);
1940 if (NILP (string))
1941 delete_logical_name (XSTRING (varname)->data);
1942 else
1943 {
1944 CHECK_STRING (string, 1);
1945
1946 if (XSTRING (string)->size == 0)
1947 delete_logical_name (XSTRING (varname)->data);
1948 else
1949 define_logical_name (XSTRING (varname)->data, XSTRING (string)->data);
1950 }
1951
1952 return string;
1953 }
1954 #endif /* VMS */
1955
1956 #ifdef HPUX_NET
1957
1958 DEFUN ("sysnetunam", Fsysnetunam, Ssysnetunam, 2, 2, 0,
1959 "Open a network connection to PATH using LOGIN as the login string.")
1960 (path, login)
1961 Lisp_Object path, login;
1962 {
1963 int netresult;
1964
1965 CHECK_STRING (path, 0);
1966 CHECK_STRING (login, 0);
1967
1968 netresult = netunam (XSTRING (path)->data, XSTRING (login)->data);
1969
1970 if (netresult == -1)
1971 return Qnil;
1972 else
1973 return Qt;
1974 }
1975 #endif /* HPUX_NET */
1976 \f
1977 DEFUN ("file-name-absolute-p", Ffile_name_absolute_p, Sfile_name_absolute_p,
1978 1, 1, 0,
1979 "Return t if file FILENAME specifies an absolute path name.\n\
1980 On Unix, this is a name starting with a `/' or a `~'.")
1981 (filename)
1982 Lisp_Object filename;
1983 {
1984 unsigned char *ptr;
1985
1986 CHECK_STRING (filename, 0);
1987 ptr = XSTRING (filename)->data;
1988 if (*ptr == '/' || *ptr == '~'
1989 #ifdef VMS
1990 /* ??? This criterion is probably wrong for '<'. */
1991 || index (ptr, ':') || index (ptr, '<')
1992 || (*ptr == '[' && (ptr[1] != '-' || (ptr[2] != '.' && ptr[2] != ']'))
1993 && ptr[1] != '.')
1994 #endif /* VMS */
1995 )
1996 return Qt;
1997 else
1998 return Qnil;
1999 }
2000
2001 DEFUN ("file-exists-p", Ffile_exists_p, Sfile_exists_p, 1, 1, 0,
2002 "Return t if file FILENAME exists. (This does not mean you can read it.)\n\
2003 See also `file-readable-p' and `file-attributes'.")
2004 (filename)
2005 Lisp_Object filename;
2006 {
2007 Lisp_Object abspath;
2008 Lisp_Object handler;
2009
2010 CHECK_STRING (filename, 0);
2011 abspath = Fexpand_file_name (filename, Qnil);
2012
2013 /* If the file name has special constructs in it,
2014 call the corresponding file handler. */
2015 handler = Ffind_file_name_handler (abspath);
2016 if (!NILP (handler))
2017 return call2 (handler, Qfile_exists_p, abspath);
2018
2019 return (access (XSTRING (abspath)->data, 0) >= 0) ? Qt : Qnil;
2020 }
2021
2022 DEFUN ("file-executable-p", Ffile_executable_p, Sfile_executable_p, 1, 1, 0,
2023 "Return t if FILENAME can be executed by you.\n\
2024 For a directory, this means you can access files in that directory.")
2025 (filename)
2026 Lisp_Object filename;
2027
2028 {
2029 Lisp_Object abspath;
2030 Lisp_Object handler;
2031
2032 CHECK_STRING (filename, 0);
2033 abspath = Fexpand_file_name (filename, Qnil);
2034
2035 /* If the file name has special constructs in it,
2036 call the corresponding file handler. */
2037 handler = Ffind_file_name_handler (abspath);
2038 if (!NILP (handler))
2039 return call2 (handler, Qfile_executable_p, abspath);
2040
2041 return (access (XSTRING (abspath)->data, 1) >= 0) ? Qt : Qnil;
2042 }
2043
2044 DEFUN ("file-readable-p", Ffile_readable_p, Sfile_readable_p, 1, 1, 0,
2045 "Return t if file FILENAME exists and you can read it.\n\
2046 See also `file-exists-p' and `file-attributes'.")
2047 (filename)
2048 Lisp_Object filename;
2049 {
2050 Lisp_Object abspath;
2051 Lisp_Object handler;
2052
2053 CHECK_STRING (filename, 0);
2054 abspath = Fexpand_file_name (filename, Qnil);
2055
2056 /* If the file name has special constructs in it,
2057 call the corresponding file handler. */
2058 handler = Ffind_file_name_handler (abspath);
2059 if (!NILP (handler))
2060 return call2 (handler, Qfile_readable_p, abspath);
2061
2062 return (access (XSTRING (abspath)->data, 4) >= 0) ? Qt : Qnil;
2063 }
2064
2065 DEFUN ("file-symlink-p", Ffile_symlink_p, Sfile_symlink_p, 1, 1, 0,
2066 "If file FILENAME is the name of a symbolic link\n\
2067 returns the name of the file to which it is linked.\n\
2068 Otherwise returns NIL.")
2069 (filename)
2070 Lisp_Object filename;
2071 {
2072 #ifdef S_IFLNK
2073 char *buf;
2074 int bufsize;
2075 int valsize;
2076 Lisp_Object val;
2077 Lisp_Object handler;
2078
2079 CHECK_STRING (filename, 0);
2080 filename = Fexpand_file_name (filename, Qnil);
2081
2082 /* If the file name has special constructs in it,
2083 call the corresponding file handler. */
2084 handler = Ffind_file_name_handler (filename);
2085 if (!NILP (handler))
2086 return call2 (handler, Qfile_symlink_p, filename);
2087
2088 bufsize = 100;
2089 while (1)
2090 {
2091 buf = (char *) xmalloc (bufsize);
2092 bzero (buf, bufsize);
2093 valsize = readlink (XSTRING (filename)->data, buf, bufsize);
2094 if (valsize < bufsize) break;
2095 /* Buffer was not long enough */
2096 xfree (buf);
2097 bufsize *= 2;
2098 }
2099 if (valsize == -1)
2100 {
2101 xfree (buf);
2102 return Qnil;
2103 }
2104 val = make_string (buf, valsize);
2105 xfree (buf);
2106 return val;
2107 #else /* not S_IFLNK */
2108 return Qnil;
2109 #endif /* not S_IFLNK */
2110 }
2111
2112 #ifdef SOLARIS_BROKEN_ACCESS
2113 /* In Solaris 2.1, the readonly-ness of the filesystem is not
2114 considered by the access system call. This is Sun's bug, but we
2115 still have to make Emacs work. */
2116
2117 #include <sys/statvfs.h>
2118
2119 static int
2120 ro_fsys (path)
2121 char *path;
2122 {
2123 struct statvfs statvfsb;
2124
2125 if (statvfs(path, &statvfsb))
2126 return 1; /* error from statvfs, be conservative and say not wrtable */
2127 else
2128 /* Otherwise, fsys is ro if bit is set. */
2129 return statvfsb.f_flag & ST_RDONLY;
2130 }
2131 #else
2132 /* But on every other os, access has already done the right thing. */
2133 #define ro_fsys(path) 0
2134 #endif
2135
2136 /* Having this before file-symlink-p mysteriously caused it to be forgotten
2137 on the RT/PC. */
2138 DEFUN ("file-writable-p", Ffile_writable_p, Sfile_writable_p, 1, 1, 0,
2139 "Return t if file FILENAME can be written or created by you.")
2140 (filename)
2141 Lisp_Object filename;
2142 {
2143 Lisp_Object abspath, dir;
2144 Lisp_Object handler;
2145
2146 CHECK_STRING (filename, 0);
2147 abspath = Fexpand_file_name (filename, Qnil);
2148
2149 /* If the file name has special constructs in it,
2150 call the corresponding file handler. */
2151 handler = Ffind_file_name_handler (abspath);
2152 if (!NILP (handler))
2153 return call2 (handler, Qfile_writable_p, abspath);
2154
2155 if (access (XSTRING (abspath)->data, 0) >= 0)
2156 return ((access (XSTRING (abspath)->data, 2) >= 0
2157 && ! ro_fsys ((char *) XSTRING (abspath)->data))
2158 ? Qt : Qnil);
2159 dir = Ffile_name_directory (abspath);
2160 #ifdef VMS
2161 if (!NILP (dir))
2162 dir = Fdirectory_file_name (dir);
2163 #endif /* VMS */
2164 return ((access (!NILP (dir) ? (char *) XSTRING (dir)->data : "", 2) >= 0
2165 && ! ro_fsys ((char *) XSTRING (dir)->data))
2166 ? Qt : Qnil);
2167 }
2168
2169 DEFUN ("file-directory-p", Ffile_directory_p, Sfile_directory_p, 1, 1, 0,
2170 "Return t if file FILENAME is the name of a directory as a file.\n\
2171 A directory name spec may be given instead; then the value is t\n\
2172 if the directory so specified exists and really is a directory.")
2173 (filename)
2174 Lisp_Object filename;
2175 {
2176 register Lisp_Object abspath;
2177 struct stat st;
2178 Lisp_Object handler;
2179
2180 abspath = expand_and_dir_to_file (filename, current_buffer->directory);
2181
2182 /* If the file name has special constructs in it,
2183 call the corresponding file handler. */
2184 handler = Ffind_file_name_handler (abspath);
2185 if (!NILP (handler))
2186 return call2 (handler, Qfile_directory_p, abspath);
2187
2188 if (stat (XSTRING (abspath)->data, &st) < 0)
2189 return Qnil;
2190 return (st.st_mode & S_IFMT) == S_IFDIR ? Qt : Qnil;
2191 }
2192
2193 DEFUN ("file-accessible-directory-p", Ffile_accessible_directory_p, Sfile_accessible_directory_p, 1, 1, 0,
2194 "Return t if file FILENAME is the name of a directory as a file,\n\
2195 and files in that directory can be opened by you. In order to use a\n\
2196 directory as a buffer's current directory, this predicate must return true.\n\
2197 A directory name spec may be given instead; then the value is t\n\
2198 if the directory so specified exists and really is a readable and\n\
2199 searchable directory.")
2200 (filename)
2201 Lisp_Object filename;
2202 {
2203 Lisp_Object handler;
2204
2205 /* If the file name has special constructs in it,
2206 call the corresponding file handler. */
2207 handler = Ffind_file_name_handler (filename);
2208 if (!NILP (handler))
2209 return call2 (handler, Qfile_accessible_directory_p, filename);
2210
2211 if (NILP (Ffile_directory_p (filename))
2212 || NILP (Ffile_executable_p (filename)))
2213 return Qnil;
2214 else
2215 return Qt;
2216 }
2217
2218 DEFUN ("file-modes", Ffile_modes, Sfile_modes, 1, 1, 0,
2219 "Return mode bits of FILE, as an integer.")
2220 (filename)
2221 Lisp_Object filename;
2222 {
2223 Lisp_Object abspath;
2224 struct stat st;
2225 Lisp_Object handler;
2226
2227 abspath = expand_and_dir_to_file (filename, current_buffer->directory);
2228
2229 /* If the file name has special constructs in it,
2230 call the corresponding file handler. */
2231 handler = Ffind_file_name_handler (abspath);
2232 if (!NILP (handler))
2233 return call2 (handler, Qfile_modes, abspath);
2234
2235 if (stat (XSTRING (abspath)->data, &st) < 0)
2236 return Qnil;
2237 return make_number (st.st_mode & 07777);
2238 }
2239
2240 DEFUN ("set-file-modes", Fset_file_modes, Sset_file_modes, 2, 2, 0,
2241 "Set mode bits of FILE to MODE (an integer).\n\
2242 Only the 12 low bits of MODE are used.")
2243 (filename, mode)
2244 Lisp_Object filename, mode;
2245 {
2246 Lisp_Object abspath;
2247 Lisp_Object handler;
2248
2249 abspath = Fexpand_file_name (filename, current_buffer->directory);
2250 CHECK_NUMBER (mode, 1);
2251
2252 /* If the file name has special constructs in it,
2253 call the corresponding file handler. */
2254 handler = Ffind_file_name_handler (abspath);
2255 if (!NILP (handler))
2256 return call3 (handler, Qset_file_modes, abspath, mode);
2257
2258 #ifndef APOLLO
2259 if (chmod (XSTRING (abspath)->data, XINT (mode)) < 0)
2260 report_file_error ("Doing chmod", Fcons (abspath, Qnil));
2261 #else /* APOLLO */
2262 if (!egetenv ("USE_DOMAIN_ACLS"))
2263 {
2264 struct stat st;
2265 struct timeval tvp[2];
2266
2267 /* chmod on apollo also change the file's modtime; need to save the
2268 modtime and then restore it. */
2269 if (stat (XSTRING (abspath)->data, &st) < 0)
2270 {
2271 report_file_error ("Doing chmod", Fcons (abspath, Qnil));
2272 return (Qnil);
2273 }
2274
2275 if (chmod (XSTRING (abspath)->data, XINT (mode)) < 0)
2276 report_file_error ("Doing chmod", Fcons (abspath, Qnil));
2277
2278 /* reset the old accessed and modified times. */
2279 tvp[0].tv_sec = st.st_atime + 1; /* +1 due to an Apollo roundoff bug */
2280 tvp[0].tv_usec = 0;
2281 tvp[1].tv_sec = st.st_mtime + 1; /* +1 due to an Apollo roundoff bug */
2282 tvp[1].tv_usec = 0;
2283
2284 if (utimes (XSTRING (abspath)->data, tvp) < 0)
2285 report_file_error ("Doing utimes", Fcons (abspath, Qnil));
2286 }
2287 #endif /* APOLLO */
2288
2289 return Qnil;
2290 }
2291
2292 DEFUN ("set-default-file-modes", Fset_default_file_modes, Sset_default_file_modes, 1, 1, 0,
2293 "Set the file permission bits for newly created files.\n\
2294 The argument MODE should be an integer; only the low 9 bits are used.\n\
2295 This setting is inherited by subprocesses.")
2296 (mode)
2297 Lisp_Object mode;
2298 {
2299 CHECK_NUMBER (mode, 0);
2300
2301 umask ((~ XINT (mode)) & 0777);
2302
2303 return Qnil;
2304 }
2305
2306 DEFUN ("default-file-modes", Fdefault_file_modes, Sdefault_file_modes, 0, 0, 0,
2307 "Return the default file protection for created files.\n\
2308 The value is an integer.")
2309 ()
2310 {
2311 int realmask;
2312 Lisp_Object value;
2313
2314 realmask = umask (0);
2315 umask (realmask);
2316
2317 XSET (value, Lisp_Int, (~ realmask) & 0777);
2318 return value;
2319 }
2320
2321 #ifdef unix
2322
2323 DEFUN ("unix-sync", Funix_sync, Sunix_sync, 0, 0, "",
2324 "Tell Unix to finish all pending disk updates.")
2325 ()
2326 {
2327 sync ();
2328 return Qnil;
2329 }
2330
2331 #endif /* unix */
2332
2333 DEFUN ("file-newer-than-file-p", Ffile_newer_than_file_p, Sfile_newer_than_file_p, 2, 2, 0,
2334 "Return t if file FILE1 is newer than file FILE2.\n\
2335 If FILE1 does not exist, the answer is nil;\n\
2336 otherwise, if FILE2 does not exist, the answer is t.")
2337 (file1, file2)
2338 Lisp_Object file1, file2;
2339 {
2340 Lisp_Object abspath1, abspath2;
2341 struct stat st;
2342 int mtime1;
2343 Lisp_Object handler;
2344 struct gcpro gcpro1, gcpro2;
2345
2346 CHECK_STRING (file1, 0);
2347 CHECK_STRING (file2, 0);
2348
2349 abspath1 = Qnil;
2350 GCPRO2 (abspath1, file2);
2351 abspath1 = expand_and_dir_to_file (file1, current_buffer->directory);
2352 abspath2 = expand_and_dir_to_file (file2, current_buffer->directory);
2353 UNGCPRO;
2354
2355 /* If the file name has special constructs in it,
2356 call the corresponding file handler. */
2357 handler = Ffind_file_name_handler (abspath1);
2358 if (NILP (handler))
2359 handler = Ffind_file_name_handler (abspath2);
2360 if (!NILP (handler))
2361 return call3 (handler, Qfile_newer_than_file_p, abspath1, abspath2);
2362
2363 if (stat (XSTRING (abspath1)->data, &st) < 0)
2364 return Qnil;
2365
2366 mtime1 = st.st_mtime;
2367
2368 if (stat (XSTRING (abspath2)->data, &st) < 0)
2369 return Qt;
2370
2371 return (mtime1 > st.st_mtime) ? Qt : Qnil;
2372 }
2373 \f
2374 DEFUN ("insert-file-contents", Finsert_file_contents, Sinsert_file_contents,
2375 1, 4, 0,
2376 "Insert contents of file FILENAME after point.\n\
2377 Returns list of absolute file name and length of data inserted.\n\
2378 If second argument VISIT is non-nil, the buffer's visited filename\n\
2379 and last save file modtime are set, and it is marked unmodified.\n\
2380 If visiting and the file does not exist, visiting is completed\n\
2381 before the error is signaled.\n\n\
2382 The optional third and fourth arguments BEG and END\n\
2383 specify what portion of the file to insert.\n\
2384 If VISIT is non-nil, BEG and END must be nil.")
2385 (filename, visit, beg, end)
2386 Lisp_Object filename, visit, beg, end;
2387 {
2388 struct stat st;
2389 register int fd;
2390 register int inserted = 0;
2391 register int how_much;
2392 int count = specpdl_ptr - specpdl;
2393 struct gcpro gcpro1, gcpro2;
2394 Lisp_Object handler, val, insval;
2395 Lisp_Object p;
2396 int total;
2397
2398 val = Qnil;
2399 p = Qnil;
2400
2401 GCPRO2 (filename, p);
2402 if (!NILP (current_buffer->read_only))
2403 Fbarf_if_buffer_read_only();
2404
2405 CHECK_STRING (filename, 0);
2406 filename = Fexpand_file_name (filename, Qnil);
2407
2408 /* If the file name has special constructs in it,
2409 call the corresponding file handler. */
2410 handler = Ffind_file_name_handler (filename);
2411 if (!NILP (handler))
2412 {
2413 val = call5 (handler, Qinsert_file_contents, filename, visit, beg, end);
2414 goto handled;
2415 }
2416
2417 fd = -1;
2418
2419 #ifndef APOLLO
2420 if (stat (XSTRING (filename)->data, &st) < 0
2421 || (fd = open (XSTRING (filename)->data, 0)) < 0)
2422 #else
2423 if ((fd = open (XSTRING (filename)->data, 0)) < 0
2424 || fstat (fd, &st) < 0)
2425 #endif /* not APOLLO */
2426 {
2427 if (fd >= 0) close (fd);
2428 if (NILP (visit))
2429 report_file_error ("Opening input file", Fcons (filename, Qnil));
2430 st.st_mtime = -1;
2431 how_much = 0;
2432 goto notfound;
2433 }
2434
2435 record_unwind_protect (close_file_unwind, make_number (fd));
2436
2437 #ifdef S_IFSOCK
2438 /* This code will need to be changed in order to work on named
2439 pipes, and it's probably just not worth it. So we should at
2440 least signal an error. */
2441 if ((st.st_mode & S_IFMT) == S_IFSOCK)
2442 Fsignal (Qfile_error,
2443 Fcons (build_string ("reading from named pipe"),
2444 Fcons (filename, Qnil)));
2445 #endif
2446
2447 /* Supposedly happens on VMS. */
2448 if (st.st_size < 0)
2449 error ("File size is negative");
2450
2451 if (!NILP (beg) || !NILP (end))
2452 if (!NILP (visit))
2453 error ("Attempt to visit less than an entire file");
2454
2455 if (!NILP (beg))
2456 CHECK_NUMBER (beg, 0);
2457 else
2458 XFASTINT (beg) = 0;
2459
2460 if (!NILP (end))
2461 CHECK_NUMBER (end, 0);
2462 else
2463 {
2464 XSETINT (end, st.st_size);
2465 if (XINT (end) != st.st_size)
2466 error ("maximum buffer size exceeded");
2467 }
2468
2469 total = XINT (end) - XINT (beg);
2470
2471 {
2472 register Lisp_Object temp;
2473
2474 /* Make sure point-max won't overflow after this insertion. */
2475 XSET (temp, Lisp_Int, total);
2476 if (total != XINT (temp))
2477 error ("maximum buffer size exceeded");
2478 }
2479
2480 if (NILP (visit) && total > 0)
2481 prepare_to_modify_buffer (point, point);
2482
2483 move_gap (point);
2484 if (GAP_SIZE < total)
2485 make_gap (total - GAP_SIZE);
2486
2487 if (XINT (beg) != 0)
2488 {
2489 if (lseek (fd, XINT (beg), 0) < 0)
2490 report_file_error ("Setting file position", Fcons (filename, Qnil));
2491 }
2492
2493 while (1)
2494 {
2495 int try = min (total - inserted, 64 << 10);
2496 int this;
2497
2498 /* Allow quitting out of the actual I/O. */
2499 immediate_quit = 1;
2500 QUIT;
2501 this = read (fd, &FETCH_CHAR (point + inserted - 1) + 1, try);
2502 immediate_quit = 0;
2503
2504 if (this <= 0)
2505 {
2506 how_much = this;
2507 break;
2508 }
2509
2510 GPT += this;
2511 GAP_SIZE -= this;
2512 ZV += this;
2513 Z += this;
2514 inserted += this;
2515 }
2516
2517 if (inserted > 0)
2518 {
2519 record_insert (point, inserted);
2520
2521 /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
2522 offset_intervals (current_buffer, point, inserted);
2523 MODIFF++;
2524 }
2525
2526 close (fd);
2527
2528 /* Discard the unwind protect */
2529 specpdl_ptr = specpdl + count;
2530
2531 if (how_much < 0)
2532 error ("IO error reading %s: %s",
2533 XSTRING (filename)->data, err_str (errno));
2534
2535 notfound:
2536 handled:
2537
2538 if (!NILP (visit))
2539 {
2540 current_buffer->undo_list = Qnil;
2541 #ifdef APOLLO
2542 stat (XSTRING (filename)->data, &st);
2543 #endif
2544 current_buffer->modtime = st.st_mtime;
2545 current_buffer->save_modified = MODIFF;
2546 current_buffer->auto_save_modified = MODIFF;
2547 XFASTINT (current_buffer->save_length) = Z - BEG;
2548 #ifdef CLASH_DETECTION
2549 if (NILP (handler))
2550 {
2551 if (!NILP (current_buffer->filename))
2552 unlock_file (current_buffer->filename);
2553 unlock_file (filename);
2554 }
2555 #endif /* CLASH_DETECTION */
2556 current_buffer->filename = filename;
2557 /* If visiting nonexistent file, return nil. */
2558 if (current_buffer->modtime == -1)
2559 report_file_error ("Opening input file", Fcons (filename, Qnil));
2560 }
2561
2562 if (NILP (visit) && total > 0)
2563 signal_after_change (point, 0, inserted);
2564
2565 if (inserted > 0)
2566 {
2567 p = Vafter_insert_file_functions;
2568 while (!NILP (p))
2569 {
2570 insval = call1 (Fcar (p), make_number (inserted));
2571 if (!NILP (insval))
2572 {
2573 CHECK_NUMBER (insval, 0);
2574 inserted = XFASTINT (insval);
2575 }
2576 QUIT;
2577 p = Fcdr (p);
2578 }
2579 }
2580
2581 if (!NILP (val))
2582 RETURN_UNGCPRO (val);
2583 RETURN_UNGCPRO (Fcons (filename,
2584 Fcons (make_number (inserted),
2585 Qnil)));
2586 }
2587 \f
2588 static Lisp_Object build_annotations ();
2589
2590 DEFUN ("write-region", Fwrite_region, Swrite_region, 3, 5,
2591 "r\nFWrite region to file: ",
2592 "Write current region into specified file.\n\
2593 When called from a program, takes three arguments:\n\
2594 START, END and FILENAME. START and END are buffer positions.\n\
2595 Optional fourth argument APPEND if non-nil means\n\
2596 append to existing file contents (if any).\n\
2597 Optional fifth argument VISIT if t means\n\
2598 set the last-save-file-modtime of buffer to this file's modtime\n\
2599 and mark buffer not modified.\n\
2600 If VISIT is a string, it is a second file name;\n\
2601 the output goes to FILENAME, but the buffer is marked as visiting VISIT.\n\
2602 VISIT is also the file name to lock and unlock for clash detection.\n\
2603 If VISIT is neither t nor nil nor a string,\n\
2604 that means do not print the \"Wrote file\" message.\n\
2605 Kludgy feature: if START is a string, then that string is written\n\
2606 to the file, instead of any buffer contents, and END is ignored.")
2607 (start, end, filename, append, visit)
2608 Lisp_Object start, end, filename, append, visit;
2609 {
2610 register int desc;
2611 int failure;
2612 int save_errno;
2613 unsigned char *fn;
2614 struct stat st;
2615 int tem;
2616 int count = specpdl_ptr - specpdl;
2617 #ifdef VMS
2618 unsigned char *fname = 0; /* If non-0, original filename (must rename) */
2619 #endif /* VMS */
2620 Lisp_Object handler;
2621 Lisp_Object visit_file;
2622 Lisp_Object annotations;
2623 int visiting, quietly;
2624 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
2625
2626 /* Special kludge to simplify auto-saving */
2627 if (NILP (start))
2628 {
2629 XFASTINT (start) = BEG;
2630 XFASTINT (end) = Z;
2631 }
2632 else if (XTYPE (start) != Lisp_String)
2633 validate_region (&start, &end);
2634
2635 filename = Fexpand_file_name (filename, Qnil);
2636 if (XTYPE (visit) == Lisp_String)
2637 visit_file = Fexpand_file_name (visit, Qnil);
2638 else
2639 visit_file = filename;
2640
2641 visiting = (EQ (visit, Qt) || XTYPE (visit) == Lisp_String);
2642 quietly = !NILP (visit);
2643
2644 annotations = Qnil;
2645
2646 GCPRO4 (start, filename, annotations, visit_file);
2647
2648 /* If the file name has special constructs in it,
2649 call the corresponding file handler. */
2650 handler = Ffind_file_name_handler (filename);
2651
2652 if (!NILP (handler))
2653 {
2654 Lisp_Object val;
2655 val = call6 (handler, Qwrite_region, start, end,
2656 filename, append, visit);
2657
2658 if (visiting)
2659 {
2660 current_buffer->save_modified = MODIFF;
2661 XFASTINT (current_buffer->save_length) = Z - BEG;
2662 current_buffer->filename = visit_file;
2663 }
2664 UNGCPRO;
2665 return val;
2666 }
2667
2668 annotations = build_annotations (start, end);
2669
2670 #ifdef CLASH_DETECTION
2671 if (!auto_saving)
2672 lock_file (visit_file);
2673 #endif /* CLASH_DETECTION */
2674
2675 fn = XSTRING (filename)->data;
2676 desc = -1;
2677 if (!NILP (append))
2678 desc = open (fn, O_WRONLY);
2679
2680 if (desc < 0)
2681 #ifdef VMS
2682 if (auto_saving) /* Overwrite any previous version of autosave file */
2683 {
2684 vms_truncate (fn); /* if fn exists, truncate to zero length */
2685 desc = open (fn, O_RDWR);
2686 if (desc < 0)
2687 desc = creat_copy_attrs (XTYPE (current_buffer->filename) == Lisp_String
2688 ? XSTRING (current_buffer->filename)->data : 0,
2689 fn);
2690 }
2691 else /* Write to temporary name and rename if no errors */
2692 {
2693 Lisp_Object temp_name;
2694 temp_name = Ffile_name_directory (filename);
2695
2696 if (!NILP (temp_name))
2697 {
2698 temp_name = Fmake_temp_name (concat2 (temp_name,
2699 build_string ("$$SAVE$$")));
2700 fname = XSTRING (filename)->data;
2701 fn = XSTRING (temp_name)->data;
2702 desc = creat_copy_attrs (fname, fn);
2703 if (desc < 0)
2704 {
2705 /* If we can't open the temporary file, try creating a new
2706 version of the original file. VMS "creat" creates a
2707 new version rather than truncating an existing file. */
2708 fn = fname;
2709 fname = 0;
2710 desc = creat (fn, 0666);
2711 #if 0 /* This can clobber an existing file and fail to replace it,
2712 if the user runs out of space. */
2713 if (desc < 0)
2714 {
2715 /* We can't make a new version;
2716 try to truncate and rewrite existing version if any. */
2717 vms_truncate (fn);
2718 desc = open (fn, O_RDWR);
2719 }
2720 #endif
2721 }
2722 }
2723 else
2724 desc = creat (fn, 0666);
2725 }
2726 #else /* not VMS */
2727 desc = creat (fn, auto_saving ? auto_save_mode_bits : 0666);
2728 #endif /* not VMS */
2729
2730 UNGCPRO;
2731
2732 if (desc < 0)
2733 {
2734 #ifdef CLASH_DETECTION
2735 save_errno = errno;
2736 if (!auto_saving) unlock_file (visit_file);
2737 errno = save_errno;
2738 #endif /* CLASH_DETECTION */
2739 report_file_error ("Opening output file", Fcons (filename, Qnil));
2740 }
2741
2742 record_unwind_protect (close_file_unwind, make_number (desc));
2743
2744 if (!NILP (append))
2745 if (lseek (desc, 0, 2) < 0)
2746 {
2747 #ifdef CLASH_DETECTION
2748 if (!auto_saving) unlock_file (visit_file);
2749 #endif /* CLASH_DETECTION */
2750 report_file_error ("Lseek error", Fcons (filename, Qnil));
2751 }
2752
2753 #ifdef VMS
2754 /*
2755 * Kludge Warning: The VMS C RTL likes to insert carriage returns
2756 * if we do writes that don't end with a carriage return. Furthermore
2757 * it cannot handle writes of more then 16K. The modified
2758 * version of "sys_write" in SYSDEP.C (see comment there) copes with
2759 * this EXCEPT for the last record (iff it doesn't end with a carriage
2760 * return). This implies that if your buffer doesn't end with a carriage
2761 * return, you get one free... tough. However it also means that if
2762 * we make two calls to sys_write (a la the following code) you can
2763 * get one at the gap as well. The easiest way to fix this (honest)
2764 * is to move the gap to the next newline (or the end of the buffer).
2765 * Thus this change.
2766 *
2767 * Yech!
2768 */
2769 if (GPT > BEG && GPT_ADDR[-1] != '\n')
2770 move_gap (find_next_newline (GPT, 1));
2771 #endif
2772
2773 failure = 0;
2774 immediate_quit = 1;
2775
2776 if (XTYPE (start) == Lisp_String)
2777 {
2778 failure = 0 > a_write (desc, XSTRING (start)->data,
2779 XSTRING (start)->size, 0, &annotations);
2780 save_errno = errno;
2781 }
2782 else if (XINT (start) != XINT (end))
2783 {
2784 int nwritten = 0;
2785 if (XINT (start) < GPT)
2786 {
2787 register int end1 = XINT (end);
2788 tem = XINT (start);
2789 failure = 0 > a_write (desc, &FETCH_CHAR (tem),
2790 min (GPT, end1) - tem, tem, &annotations);
2791 nwritten += min (GPT, end1) - tem;
2792 save_errno = errno;
2793 }
2794
2795 if (XINT (end) > GPT && !failure)
2796 {
2797 tem = XINT (start);
2798 tem = max (tem, GPT);
2799 failure = 0 > a_write (desc, &FETCH_CHAR (tem), XINT (end) - tem,
2800 tem, &annotations);
2801 nwritten += XINT (end) - tem;
2802 save_errno = errno;
2803 }
2804
2805 if (nwritten == 0)
2806 {
2807 /* If file was empty, still need to write the annotations */
2808 failure = 0 > a_write (desc, "", 0, XINT (start), &annotations);
2809 save_errno = errno;
2810 }
2811 }
2812
2813 immediate_quit = 0;
2814
2815 #ifdef HAVE_FSYNC
2816 /* Note fsync appears to change the modtime on BSD4.2 (both vax and sun).
2817 Disk full in NFS may be reported here. */
2818 /* mib says that closing the file will try to write as fast as NFS can do
2819 it, and that means the fsync here is not crucial for autosave files. */
2820 if (!auto_saving && fsync (desc) < 0)
2821 failure = 1, save_errno = errno;
2822 #endif
2823
2824 /* Spurious "file has changed on disk" warnings have been
2825 observed on Suns as well.
2826 It seems that `close' can change the modtime, under nfs.
2827
2828 (This has supposedly been fixed in Sunos 4,
2829 but who knows about all the other machines with NFS?) */
2830 #if 0
2831
2832 /* On VMS and APOLLO, must do the stat after the close
2833 since closing changes the modtime. */
2834 #ifndef VMS
2835 #ifndef APOLLO
2836 /* Recall that #if defined does not work on VMS. */
2837 #define FOO
2838 fstat (desc, &st);
2839 #endif
2840 #endif
2841 #endif
2842
2843 /* NFS can report a write failure now. */
2844 if (close (desc) < 0)
2845 failure = 1, save_errno = errno;
2846
2847 #ifdef VMS
2848 /* If we wrote to a temporary name and had no errors, rename to real name. */
2849 if (fname)
2850 {
2851 if (!failure)
2852 failure = (rename (fn, fname) != 0), save_errno = errno;
2853 fn = fname;
2854 }
2855 #endif /* VMS */
2856
2857 #ifndef FOO
2858 stat (fn, &st);
2859 #endif
2860 /* Discard the unwind protect */
2861 specpdl_ptr = specpdl + count;
2862
2863 #ifdef CLASH_DETECTION
2864 if (!auto_saving)
2865 unlock_file (visit_file);
2866 #endif /* CLASH_DETECTION */
2867
2868 /* Do this before reporting IO error
2869 to avoid a "file has changed on disk" warning on
2870 next attempt to save. */
2871 if (visiting)
2872 current_buffer->modtime = st.st_mtime;
2873
2874 if (failure)
2875 error ("IO error writing %s: %s", fn, err_str (save_errno));
2876
2877 if (visiting)
2878 {
2879 current_buffer->save_modified = MODIFF;
2880 XFASTINT (current_buffer->save_length) = Z - BEG;
2881 current_buffer->filename = visit_file;
2882 }
2883 else if (quietly)
2884 return Qnil;
2885
2886 if (!auto_saving)
2887 message ("Wrote %s", XSTRING (visit_file)->data);
2888
2889 return Qnil;
2890 }
2891
2892 Lisp_Object merge ();
2893
2894 DEFUN ("car-less-than-car", Fcar_less_than_car, Scar_less_than_car, 2, 2, 0,
2895 "Return t if (car A) is numerically less than (car B).")
2896 (a, b)
2897 Lisp_Object a, b;
2898 {
2899 return Flss (Fcar (a), Fcar (b));
2900 }
2901
2902 /* Build the complete list of annotations appropriate for writing out
2903 the text between START and END, by calling all the functions in
2904 write-region-annotate-functions and merging the lists they return. */
2905
2906 static Lisp_Object
2907 build_annotations (start, end)
2908 Lisp_Object start, end;
2909 {
2910 Lisp_Object annotations;
2911 Lisp_Object p, res;
2912 struct gcpro gcpro1, gcpro2;
2913
2914 annotations = Qnil;
2915 p = Vwrite_region_annotate_functions;
2916 GCPRO2 (annotations, p);
2917 while (!NILP (p))
2918 {
2919 res = call2 (Fcar (p), start, end);
2920 Flength (res); /* Check basic validity of return value */
2921 annotations = merge (annotations, res, Qcar_less_than_car);
2922 p = Fcdr (p);
2923 }
2924 UNGCPRO;
2925 return annotations;
2926 }
2927
2928 /* Write to descriptor DESC the LEN characters starting at ADDR,
2929 assuming they start at position POS in the buffer.
2930 Intersperse with them the annotations from *ANNOT
2931 (those which fall within the range of positions POS to POS + LEN),
2932 each at its appropriate position.
2933
2934 Modify *ANNOT by discarding elements as we output them.
2935 The return value is negative in case of system call failure. */
2936
2937 int
2938 a_write (desc, addr, len, pos, annot)
2939 int desc;
2940 register char *addr;
2941 register int len;
2942 int pos;
2943 Lisp_Object *annot;
2944 {
2945 Lisp_Object tem;
2946 int nextpos;
2947 int lastpos = pos + len;
2948
2949 while (1)
2950 {
2951 tem = Fcar_safe (Fcar (*annot));
2952 if (INTEGERP (tem) && XINT (tem) >= pos && XFASTINT (tem) <= lastpos)
2953 nextpos = XFASTINT (tem);
2954 else
2955 return e_write (desc, addr, lastpos - pos);
2956 if (nextpos > pos)
2957 {
2958 if (0 > e_write (desc, addr, nextpos - pos))
2959 return -1;
2960 addr += nextpos - pos;
2961 pos = nextpos;
2962 }
2963 tem = Fcdr (Fcar (*annot));
2964 if (STRINGP (tem))
2965 {
2966 if (0 > e_write (desc, XSTRING (tem)->data, XSTRING (tem)->size))
2967 return -1;
2968 }
2969 *annot = Fcdr (*annot);
2970 }
2971 }
2972
2973 int
2974 e_write (desc, addr, len)
2975 int desc;
2976 register char *addr;
2977 register int len;
2978 {
2979 char buf[16 * 1024];
2980 register char *p, *end;
2981
2982 if (!EQ (current_buffer->selective_display, Qt))
2983 return write (desc, addr, len) - len;
2984 else
2985 {
2986 p = buf;
2987 end = p + sizeof buf;
2988 while (len--)
2989 {
2990 if (p == end)
2991 {
2992 if (write (desc, buf, sizeof buf) != sizeof buf)
2993 return -1;
2994 p = buf;
2995 }
2996 *p = *addr++;
2997 if (*p++ == '\015')
2998 p[-1] = '\n';
2999 }
3000 if (p != buf)
3001 if (write (desc, buf, p - buf) != p - buf)
3002 return -1;
3003 }
3004 return 0;
3005 }
3006
3007 DEFUN ("verify-visited-file-modtime", Fverify_visited_file_modtime,
3008 Sverify_visited_file_modtime, 1, 1, 0,
3009 "Return t if last mod time of BUF's visited file matches what BUF records.\n\
3010 This means that the file has not been changed since it was visited or saved.")
3011 (buf)
3012 Lisp_Object buf;
3013 {
3014 struct buffer *b;
3015 struct stat st;
3016 Lisp_Object handler;
3017
3018 CHECK_BUFFER (buf, 0);
3019 b = XBUFFER (buf);
3020
3021 if (XTYPE (b->filename) != Lisp_String) return Qt;
3022 if (b->modtime == 0) return Qt;
3023
3024 /* If the file name has special constructs in it,
3025 call the corresponding file handler. */
3026 handler = Ffind_file_name_handler (b->filename);
3027 if (!NILP (handler))
3028 return call2 (handler, Qverify_visited_file_modtime, buf);
3029
3030 if (stat (XSTRING (b->filename)->data, &st) < 0)
3031 {
3032 /* If the file doesn't exist now and didn't exist before,
3033 we say that it isn't modified, provided the error is a tame one. */
3034 if (errno == ENOENT || errno == EACCES || errno == ENOTDIR)
3035 st.st_mtime = -1;
3036 else
3037 st.st_mtime = 0;
3038 }
3039 if (st.st_mtime == b->modtime
3040 /* If both are positive, accept them if they are off by one second. */
3041 || (st.st_mtime > 0 && b->modtime > 0
3042 && (st.st_mtime == b->modtime + 1
3043 || st.st_mtime == b->modtime - 1)))
3044 return Qt;
3045 return Qnil;
3046 }
3047
3048 DEFUN ("clear-visited-file-modtime", Fclear_visited_file_modtime,
3049 Sclear_visited_file_modtime, 0, 0, 0,
3050 "Clear out records of last mod time of visited file.\n\
3051 Next attempt to save will certainly not complain of a discrepancy.")
3052 ()
3053 {
3054 current_buffer->modtime = 0;
3055 return Qnil;
3056 }
3057
3058 DEFUN ("visited-file-modtime", Fvisited_file_modtime,
3059 Svisited_file_modtime, 0, 0, 0,
3060 "Return the current buffer's recorded visited file modification time.\n\
3061 The value is a list of the form (HIGH . LOW), like the time values\n\
3062 that `file-attributes' returns.")
3063 ()
3064 {
3065 return long_to_cons (current_buffer->modtime);
3066 }
3067
3068 DEFUN ("set-visited-file-modtime", Fset_visited_file_modtime,
3069 Sset_visited_file_modtime, 0, 1, 0,
3070 "Update buffer's recorded modification time from the visited file's time.\n\
3071 Useful if the buffer was not read from the file normally\n\
3072 or if the file itself has been changed for some known benign reason.\n\
3073 An argument specifies the modification time value to use\n\
3074 \(instead of that of the visited file), in the form of a list\n\
3075 \(HIGH . LOW) or (HIGH LOW).")
3076 (time_list)
3077 Lisp_Object time_list;
3078 {
3079 if (!NILP (time_list))
3080 current_buffer->modtime = cons_to_long (time_list);
3081 else
3082 {
3083 register Lisp_Object filename;
3084 struct stat st;
3085 Lisp_Object handler;
3086
3087 filename = Fexpand_file_name (current_buffer->filename, Qnil);
3088
3089 /* If the file name has special constructs in it,
3090 call the corresponding file handler. */
3091 handler = Ffind_file_name_handler (filename);
3092 if (!NILP (handler))
3093 /* The handler can find the file name the same way we did. */
3094 return call2 (handler, Qset_visited_file_modtime, Qnil);
3095 else if (stat (XSTRING (filename)->data, &st) >= 0)
3096 current_buffer->modtime = st.st_mtime;
3097 }
3098
3099 return Qnil;
3100 }
3101 \f
3102 Lisp_Object
3103 auto_save_error ()
3104 {
3105 unsigned char *name = XSTRING (current_buffer->name)->data;
3106
3107 ring_bell ();
3108 message ("Autosaving...error for %s", name);
3109 Fsleep_for (make_number (1), Qnil);
3110 message ("Autosaving...error!for %s", name);
3111 Fsleep_for (make_number (1), Qnil);
3112 message ("Autosaving...error for %s", name);
3113 Fsleep_for (make_number (1), Qnil);
3114 return Qnil;
3115 }
3116
3117 Lisp_Object
3118 auto_save_1 ()
3119 {
3120 unsigned char *fn;
3121 struct stat st;
3122
3123 /* Get visited file's mode to become the auto save file's mode. */
3124 if (stat (XSTRING (current_buffer->filename)->data, &st) >= 0)
3125 /* But make sure we can overwrite it later! */
3126 auto_save_mode_bits = st.st_mode | 0600;
3127 else
3128 auto_save_mode_bits = 0666;
3129
3130 return
3131 Fwrite_region (Qnil, Qnil,
3132 current_buffer->auto_save_file_name,
3133 Qnil, Qlambda);
3134 }
3135
3136 DEFUN ("do-auto-save", Fdo_auto_save, Sdo_auto_save, 0, 2, "",
3137 "Auto-save all buffers that need it.\n\
3138 This is all buffers that have auto-saving enabled\n\
3139 and are changed since last auto-saved.\n\
3140 Auto-saving writes the buffer into a file\n\
3141 so that your editing is not lost if the system crashes.\n\
3142 This file is not the file you visited; that changes only when you save.\n\n\
3143 Non-nil first argument means do not print any message if successful.\n\
3144 Non-nil second argument means save only current buffer.")
3145 (no_message, current_only)
3146 Lisp_Object no_message, current_only;
3147 {
3148 struct buffer *old = current_buffer, *b;
3149 Lisp_Object tail, buf;
3150 int auto_saved = 0;
3151 char *omessage = echo_area_glyphs;
3152 extern int minibuf_level;
3153 int do_handled_files;
3154 Lisp_Object oquit;
3155
3156 /* Ordinarily don't quit within this function,
3157 but don't make it impossible to quit (in case we get hung in I/O). */
3158 oquit = Vquit_flag;
3159 Vquit_flag = Qnil;
3160
3161 /* No GCPRO needed, because (when it matters) all Lisp_Object variables
3162 point to non-strings reached from Vbuffer_alist. */
3163
3164 auto_saving = 1;
3165 if (minibuf_level)
3166 no_message = Qt;
3167
3168 /* Vrun_hooks is nil before emacs is dumped, and inc-vers.el will
3169 eventually call do-auto-save, so don't err here in that case. */
3170 if (!NILP (Vrun_hooks))
3171 call1 (Vrun_hooks, intern ("auto-save-hook"));
3172
3173 /* First, save all files which don't have handlers. If Emacs is
3174 crashing, the handlers may tweak what is causing Emacs to crash
3175 in the first place, and it would be a shame if Emacs failed to
3176 autosave perfectly ordinary files because it couldn't handle some
3177 ange-ftp'd file. */
3178 for (do_handled_files = 0; do_handled_files < 2; do_handled_files++)
3179 for (tail = Vbuffer_alist; XGCTYPE (tail) == Lisp_Cons;
3180 tail = XCONS (tail)->cdr)
3181 {
3182 buf = XCONS (XCONS (tail)->car)->cdr;
3183 b = XBUFFER (buf);
3184
3185 if (!NILP (current_only)
3186 && b != current_buffer)
3187 continue;
3188
3189 /* Check for auto save enabled
3190 and file changed since last auto save
3191 and file changed since last real save. */
3192 if (XTYPE (b->auto_save_file_name) == Lisp_String
3193 && b->save_modified < BUF_MODIFF (b)
3194 && b->auto_save_modified < BUF_MODIFF (b)
3195 && (do_handled_files
3196 || NILP (Ffind_file_name_handler (b->auto_save_file_name))))
3197 {
3198 if ((XFASTINT (b->save_length) * 10
3199 > (BUF_Z (b) - BUF_BEG (b)) * 13)
3200 /* A short file is likely to change a large fraction;
3201 spare the user annoying messages. */
3202 && XFASTINT (b->save_length) > 5000
3203 /* These messages are frequent and annoying for `*mail*'. */
3204 && !EQ (b->filename, Qnil)
3205 && NILP (no_message))
3206 {
3207 /* It has shrunk too much; turn off auto-saving here. */
3208 message ("Buffer %s has shrunk a lot; auto save turned off there",
3209 XSTRING (b->name)->data);
3210 /* User can reenable saving with M-x auto-save. */
3211 b->auto_save_file_name = Qnil;
3212 /* Prevent warning from repeating if user does so. */
3213 XFASTINT (b->save_length) = 0;
3214 Fsleep_for (make_number (1), Qnil);
3215 continue;
3216 }
3217 set_buffer_internal (b);
3218 if (!auto_saved && NILP (no_message))
3219 message1 ("Auto-saving...");
3220 internal_condition_case (auto_save_1, Qt, auto_save_error);
3221 auto_saved++;
3222 b->auto_save_modified = BUF_MODIFF (b);
3223 XFASTINT (current_buffer->save_length) = Z - BEG;
3224 set_buffer_internal (old);
3225 }
3226 }
3227
3228 /* Prevent another auto save till enough input events come in. */
3229 record_auto_save ();
3230
3231 if (auto_saved && NILP (no_message))
3232 message1 (omessage ? omessage : "Auto-saving...done");
3233
3234 Vquit_flag = oquit;
3235
3236 auto_saving = 0;
3237 return Qnil;
3238 }
3239
3240 DEFUN ("set-buffer-auto-saved", Fset_buffer_auto_saved,
3241 Sset_buffer_auto_saved, 0, 0, 0,
3242 "Mark current buffer as auto-saved with its current text.\n\
3243 No auto-save file will be written until the buffer changes again.")
3244 ()
3245 {
3246 current_buffer->auto_save_modified = MODIFF;
3247 XFASTINT (current_buffer->save_length) = Z - BEG;
3248 return Qnil;
3249 }
3250
3251 DEFUN ("recent-auto-save-p", Frecent_auto_save_p, Srecent_auto_save_p,
3252 0, 0, 0,
3253 "Return t if buffer has been auto-saved since last read in or saved.")
3254 ()
3255 {
3256 return (current_buffer->save_modified < current_buffer->auto_save_modified) ? Qt : Qnil;
3257 }
3258 \f
3259 /* Reading and completing file names */
3260 extern Lisp_Object Ffile_name_completion (), Ffile_name_all_completions ();
3261
3262 DEFUN ("read-file-name-internal", Fread_file_name_internal, Sread_file_name_internal,
3263 3, 3, 0,
3264 "Internal subroutine for read-file-name. Do not call this.")
3265 (string, dir, action)
3266 Lisp_Object string, dir, action;
3267 /* action is nil for complete, t for return list of completions,
3268 lambda for verify final value */
3269 {
3270 Lisp_Object name, specdir, realdir, val, orig_string;
3271 int changed;
3272 struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
3273
3274 realdir = dir;
3275 name = string;
3276 orig_string = Qnil;
3277 specdir = Qnil;
3278 changed = 0;
3279 /* No need to protect ACTION--we only compare it with t and nil. */
3280 GCPRO4 (string, realdir, name, specdir);
3281
3282 if (XSTRING (string)->size == 0)
3283 {
3284 if (EQ (action, Qlambda))
3285 {
3286 UNGCPRO;
3287 return Qnil;
3288 }
3289 }
3290 else
3291 {
3292 orig_string = string;
3293 string = Fsubstitute_in_file_name (string);
3294 changed = NILP (Fstring_equal (string, orig_string));
3295 name = Ffile_name_nondirectory (string);
3296 val = Ffile_name_directory (string);
3297 if (! NILP (val))
3298 realdir = Fexpand_file_name (val, realdir);
3299 }
3300
3301 if (NILP (action))
3302 {
3303 specdir = Ffile_name_directory (string);
3304 val = Ffile_name_completion (name, realdir);
3305 UNGCPRO;
3306 if (XTYPE (val) != Lisp_String)
3307 {
3308 if (changed)
3309 return string;
3310 return val;
3311 }
3312
3313 if (!NILP (specdir))
3314 val = concat2 (specdir, val);
3315 #ifndef VMS
3316 {
3317 register unsigned char *old, *new;
3318 register int n;
3319 int osize, count;
3320
3321 osize = XSTRING (val)->size;
3322 /* Quote "$" as "$$" to get it past substitute-in-file-name */
3323 for (n = osize, count = 0, old = XSTRING (val)->data; n > 0; n--)
3324 if (*old++ == '$') count++;
3325 if (count > 0)
3326 {
3327 old = XSTRING (val)->data;
3328 val = Fmake_string (make_number (osize + count), make_number (0));
3329 new = XSTRING (val)->data;
3330 for (n = osize; n > 0; n--)
3331 if (*old != '$')
3332 *new++ = *old++;
3333 else
3334 {
3335 *new++ = '$';
3336 *new++ = '$';
3337 old++;
3338 }
3339 }
3340 }
3341 #endif /* Not VMS */
3342 return val;
3343 }
3344 UNGCPRO;
3345
3346 if (EQ (action, Qt))
3347 return Ffile_name_all_completions (name, realdir);
3348 /* Only other case actually used is ACTION = lambda */
3349 #ifdef VMS
3350 /* Supposedly this helps commands such as `cd' that read directory names,
3351 but can someone explain how it helps them? -- RMS */
3352 if (XSTRING (name)->size == 0)
3353 return Qt;
3354 #endif /* VMS */
3355 return Ffile_exists_p (string);
3356 }
3357
3358 DEFUN ("read-file-name", Fread_file_name, Sread_file_name, 1, 5, 0,
3359 "Read file name, prompting with PROMPT and completing in directory DIR.\n\
3360 Value is not expanded---you must call `expand-file-name' yourself.\n\
3361 Default name to DEFAULT if user enters a null string.\n\
3362 (If DEFAULT is omitted, the visited file name is used.)\n\
3363 Fourth arg MUSTMATCH non-nil means require existing file's name.\n\
3364 Non-nil and non-t means also require confirmation after completion.\n\
3365 Fifth arg INITIAL specifies text to start with.\n\
3366 DIR defaults to current buffer's directory default.")
3367 (prompt, dir, defalt, mustmatch, initial)
3368 Lisp_Object prompt, dir, defalt, mustmatch, initial;
3369 {
3370 Lisp_Object val, insdef, insdef1, tem;
3371 struct gcpro gcpro1, gcpro2;
3372 register char *homedir;
3373 int count;
3374
3375 if (NILP (dir))
3376 dir = current_buffer->directory;
3377 if (NILP (defalt))
3378 defalt = current_buffer->filename;
3379
3380 /* If dir starts with user's homedir, change that to ~. */
3381 homedir = (char *) egetenv ("HOME");
3382 if (homedir != 0
3383 && XTYPE (dir) == Lisp_String
3384 && !strncmp (homedir, XSTRING (dir)->data, strlen (homedir))
3385 && XSTRING (dir)->data[strlen (homedir)] == '/')
3386 {
3387 dir = make_string (XSTRING (dir)->data + strlen (homedir) - 1,
3388 XSTRING (dir)->size - strlen (homedir) + 1);
3389 XSTRING (dir)->data[0] = '~';
3390 }
3391
3392 if (insert_default_directory)
3393 {
3394 insdef = dir;
3395 insdef1 = dir;
3396 if (!NILP (initial))
3397 {
3398 Lisp_Object args[2], pos;
3399
3400 args[0] = insdef;
3401 args[1] = initial;
3402 insdef = Fconcat (2, args);
3403 pos = make_number (XSTRING (dir)->size);
3404 insdef1 = Fcons (insdef, pos);
3405 }
3406 }
3407 else
3408 insdef = Qnil, insdef1 = Qnil;
3409
3410 #ifdef VMS
3411 count = specpdl_ptr - specpdl;
3412 specbind (intern ("completion-ignore-case"), Qt);
3413 #endif
3414
3415 GCPRO2 (insdef, defalt);
3416 val = Fcompleting_read (prompt, intern ("read-file-name-internal"),
3417 dir, mustmatch, insdef1,
3418 Qfile_name_history);
3419
3420 #ifdef VMS
3421 unbind_to (count, Qnil);
3422 #endif
3423
3424 UNGCPRO;
3425 if (NILP (val))
3426 error ("No file name specified");
3427 tem = Fstring_equal (val, insdef);
3428 if (!NILP (tem) && !NILP (defalt))
3429 return defalt;
3430 if (XSTRING (val)->size == 0 && NILP (insdef))
3431 {
3432 if (!NILP (defalt))
3433 return defalt;
3434 else
3435 error ("No default file name");
3436 }
3437 return Fsubstitute_in_file_name (val);
3438 }
3439
3440 #if 0 /* Old version */
3441 DEFUN ("read-file-name", Fread_file_name, Sread_file_name, 1, 5, 0,
3442 "Read file name, prompting with PROMPT and completing in directory DIR.\n\
3443 Value is not expanded---you must call `expand-file-name' yourself.\n\
3444 Default name to DEFAULT if user enters a null string.\n\
3445 (If DEFAULT is omitted, the visited file name is used.)\n\
3446 Fourth arg MUSTMATCH non-nil means require existing file's name.\n\
3447 Non-nil and non-t means also require confirmation after completion.\n\
3448 Fifth arg INITIAL specifies text to start with.\n\
3449 DIR defaults to current buffer's directory default.")
3450 (prompt, dir, defalt, mustmatch, initial)
3451 Lisp_Object prompt, dir, defalt, mustmatch, initial;
3452 {
3453 Lisp_Object val, insdef, tem;
3454 struct gcpro gcpro1, gcpro2;
3455 register char *homedir;
3456 int count;
3457
3458 if (NILP (dir))
3459 dir = current_buffer->directory;
3460 if (NILP (defalt))
3461 defalt = current_buffer->filename;
3462
3463 /* If dir starts with user's homedir, change that to ~. */
3464 homedir = (char *) egetenv ("HOME");
3465 if (homedir != 0
3466 && XTYPE (dir) == Lisp_String
3467 && !strncmp (homedir, XSTRING (dir)->data, strlen (homedir))
3468 && XSTRING (dir)->data[strlen (homedir)] == '/')
3469 {
3470 dir = make_string (XSTRING (dir)->data + strlen (homedir) - 1,
3471 XSTRING (dir)->size - strlen (homedir) + 1);
3472 XSTRING (dir)->data[0] = '~';
3473 }
3474
3475 if (!NILP (initial))
3476 insdef = initial;
3477 else if (insert_default_directory)
3478 insdef = dir;
3479 else
3480 insdef = build_string ("");
3481
3482 #ifdef VMS
3483 count = specpdl_ptr - specpdl;
3484 specbind (intern ("completion-ignore-case"), Qt);
3485 #endif
3486
3487 GCPRO2 (insdef, defalt);
3488 val = Fcompleting_read (prompt, intern ("read-file-name-internal"),
3489 dir, mustmatch,
3490 insert_default_directory ? insdef : Qnil,
3491 Qfile_name_history);
3492
3493 #ifdef VMS
3494 unbind_to (count, Qnil);
3495 #endif
3496
3497 UNGCPRO;
3498 if (NILP (val))
3499 error ("No file name specified");
3500 tem = Fstring_equal (val, insdef);
3501 if (!NILP (tem) && !NILP (defalt))
3502 return defalt;
3503 return Fsubstitute_in_file_name (val);
3504 }
3505 #endif /* Old version */
3506 \f
3507 syms_of_fileio ()
3508 {
3509 Qexpand_file_name = intern ("expand-file-name");
3510 Qdirectory_file_name = intern ("directory-file-name");
3511 Qfile_name_directory = intern ("file-name-directory");
3512 Qfile_name_nondirectory = intern ("file-name-nondirectory");
3513 Qunhandled_file_name_directory = intern ("unhandled-file-name-directory");
3514 Qfile_name_as_directory = intern ("file-name-as-directory");
3515 Qcopy_file = intern ("copy-file");
3516 Qmake_directory = intern ("make-directory");
3517 Qdelete_directory = intern ("delete-directory");
3518 Qdelete_file = intern ("delete-file");
3519 Qrename_file = intern ("rename-file");
3520 Qadd_name_to_file = intern ("add-name-to-file");
3521 Qmake_symbolic_link = intern ("make-symbolic-link");
3522 Qfile_exists_p = intern ("file-exists-p");
3523 Qfile_executable_p = intern ("file-executable-p");
3524 Qfile_readable_p = intern ("file-readable-p");
3525 Qfile_symlink_p = intern ("file-symlink-p");
3526 Qfile_writable_p = intern ("file-writable-p");
3527 Qfile_directory_p = intern ("file-directory-p");
3528 Qfile_accessible_directory_p = intern ("file-accessible-directory-p");
3529 Qfile_modes = intern ("file-modes");
3530 Qset_file_modes = intern ("set-file-modes");
3531 Qfile_newer_than_file_p = intern ("file-newer-than-file-p");
3532 Qinsert_file_contents = intern ("insert-file-contents");
3533 Qwrite_region = intern ("write-region");
3534 Qverify_visited_file_modtime = intern ("verify-visited-file-modtime");
3535 Qset_visited_file_modtime = intern ("set-visited-file-modtime");
3536
3537 staticpro (&Qexpand_file_name);
3538 staticpro (&Qdirectory_file_name);
3539 staticpro (&Qfile_name_directory);
3540 staticpro (&Qfile_name_nondirectory);
3541 staticpro (&Qunhandled_file_name_directory);
3542 staticpro (&Qfile_name_as_directory);
3543 staticpro (&Qcopy_file);
3544 staticpro (&Qmake_directory);
3545 staticpro (&Qdelete_directory);
3546 staticpro (&Qdelete_file);
3547 staticpro (&Qrename_file);
3548 staticpro (&Qadd_name_to_file);
3549 staticpro (&Qmake_symbolic_link);
3550 staticpro (&Qfile_exists_p);
3551 staticpro (&Qfile_executable_p);
3552 staticpro (&Qfile_readable_p);
3553 staticpro (&Qfile_symlink_p);
3554 staticpro (&Qfile_writable_p);
3555 staticpro (&Qfile_directory_p);
3556 staticpro (&Qfile_accessible_directory_p);
3557 staticpro (&Qfile_modes);
3558 staticpro (&Qset_file_modes);
3559 staticpro (&Qfile_newer_than_file_p);
3560 staticpro (&Qinsert_file_contents);
3561 staticpro (&Qwrite_region);
3562 staticpro (&Qverify_visited_file_modtime);
3563
3564 Qfile_name_history = intern ("file-name-history");
3565 Fset (Qfile_name_history, Qnil);
3566 staticpro (&Qfile_name_history);
3567
3568 Qfile_error = intern ("file-error");
3569 staticpro (&Qfile_error);
3570 Qfile_already_exists = intern("file-already-exists");
3571 staticpro (&Qfile_already_exists);
3572
3573 Qcar_less_than_car = intern ("car-less-than-car");
3574 staticpro (&Qcar_less_than_car);
3575
3576 Fput (Qfile_error, Qerror_conditions,
3577 Fcons (Qfile_error, Fcons (Qerror, Qnil)));
3578 Fput (Qfile_error, Qerror_message,
3579 build_string ("File error"));
3580
3581 Fput (Qfile_already_exists, Qerror_conditions,
3582 Fcons (Qfile_already_exists,
3583 Fcons (Qfile_error, Fcons (Qerror, Qnil))));
3584 Fput (Qfile_already_exists, Qerror_message,
3585 build_string ("File already exists"));
3586
3587 DEFVAR_BOOL ("insert-default-directory", &insert_default_directory,
3588 "*Non-nil means when reading a filename start with default dir in minibuffer.");
3589 insert_default_directory = 1;
3590
3591 DEFVAR_BOOL ("vms-stmlf-recfm", &vms_stmlf_recfm,
3592 "*Non-nil means write new files with record format `stmlf'.\n\
3593 nil means use format `var'. This variable is meaningful only on VMS.");
3594 vms_stmlf_recfm = 0;
3595
3596 DEFVAR_LISP ("file-name-handler-alist", &Vfile_name_handler_alist,
3597 "*Alist of elements (REGEXP . HANDLER) for file names handled specially.\n\
3598 If a file name matches REGEXP, then all I/O on that file is done by calling\n\
3599 HANDLER.\n\
3600 \n\
3601 The first argument given to HANDLER is the name of the I/O primitive\n\
3602 to be handled; the remaining arguments are the arguments that were\n\
3603 passed to that primitive. For example, if you do\n\
3604 (file-exists-p FILENAME)\n\
3605 and FILENAME is handled by HANDLER, then HANDLER is called like this:\n\
3606 (funcall HANDLER 'file-exists-p FILENAME)\n\
3607 The function `find-file-name-handler' checks this list for a handler\n\
3608 for its argument.");
3609 Vfile_name_handler_alist = Qnil;
3610
3611 DEFVAR_LISP ("after-insert-file-functions", &Vafter_insert_file_functions,
3612 "A list of functions to be called at the end of `insert-file-contents'.\n\
3613 Each is passed one argument, the number of bytes inserted. It should return\n\
3614 the new byte count, and leave point the same. If `insert-file-contents' is\n\
3615 intercepted by a handler from `file-name-handler-alist', that handler is\n\
3616 responsible for calling the after-insert-file-functions if appropriate.");
3617 Vafter_insert_file_functions = Qnil;
3618
3619 DEFVAR_LISP ("write-region-annotate-functions", &Vwrite_region_annotate_functions,
3620 "A list of functions to be called at the start of `write-region'.\n\
3621 Each is passed two arguments, START and END as for `write-region'. It should\n\
3622 return a list of pairs (POSITION . STRING) of strings to be effectively\n\
3623 inserted at the specified positions of the file being written (1 means to\n\
3624 insert before the first byte written). The POSITIONs must be sorted into\n\
3625 increasing order. If there are several functions in the list, the several\n\
3626 lists are merged destructively.");
3627 Vwrite_region_annotate_functions = Qnil;
3628
3629 defsubr (&Sfind_file_name_handler);
3630 defsubr (&Sfile_name_directory);
3631 defsubr (&Sfile_name_nondirectory);
3632 defsubr (&Sunhandled_file_name_directory);
3633 defsubr (&Sfile_name_as_directory);
3634 defsubr (&Sdirectory_file_name);
3635 defsubr (&Smake_temp_name);
3636 defsubr (&Sexpand_file_name);
3637 defsubr (&Ssubstitute_in_file_name);
3638 defsubr (&Scopy_file);
3639 defsubr (&Smake_directory_internal);
3640 defsubr (&Sdelete_directory);
3641 defsubr (&Sdelete_file);
3642 defsubr (&Srename_file);
3643 defsubr (&Sadd_name_to_file);
3644 #ifdef S_IFLNK
3645 defsubr (&Smake_symbolic_link);
3646 #endif /* S_IFLNK */
3647 #ifdef VMS
3648 defsubr (&Sdefine_logical_name);
3649 #endif /* VMS */
3650 #ifdef HPUX_NET
3651 defsubr (&Ssysnetunam);
3652 #endif /* HPUX_NET */
3653 defsubr (&Sfile_name_absolute_p);
3654 defsubr (&Sfile_exists_p);
3655 defsubr (&Sfile_executable_p);
3656 defsubr (&Sfile_readable_p);
3657 defsubr (&Sfile_writable_p);
3658 defsubr (&Sfile_symlink_p);
3659 defsubr (&Sfile_directory_p);
3660 defsubr (&Sfile_accessible_directory_p);
3661 defsubr (&Sfile_modes);
3662 defsubr (&Sset_file_modes);
3663 defsubr (&Sset_default_file_modes);
3664 defsubr (&Sdefault_file_modes);
3665 defsubr (&Sfile_newer_than_file_p);
3666 defsubr (&Sinsert_file_contents);
3667 defsubr (&Swrite_region);
3668 defsubr (&Scar_less_than_car);
3669 defsubr (&Sverify_visited_file_modtime);
3670 defsubr (&Sclear_visited_file_modtime);
3671 defsubr (&Svisited_file_modtime);
3672 defsubr (&Sset_visited_file_modtime);
3673 defsubr (&Sdo_auto_save);
3674 defsubr (&Sset_buffer_auto_saved);
3675 defsubr (&Srecent_auto_save_p);
3676
3677 defsubr (&Sread_file_name_internal);
3678 defsubr (&Sread_file_name);
3679
3680 #ifdef unix
3681 defsubr (&Sunix_sync);
3682 #endif
3683 }