1 /* Part of CPP library. (include file handling)
2 Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
4 Written by Per Bothner, 1994.
5 Based on CCCP program by Paul Rubin, June 1986
6 Adapted to ANSI C, Richard Stallman, Jan 1987
7 Split out of cpplib.c, Zack Weinberg, Oct 1998
9 This program is free software; you can redistribute it and/or modify it
10 under the terms of the GNU General Public License as published by the
11 Free Software Foundation; either version 2, or (at your option) any
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
29 #include "splay-tree.h"
32 # include <sys/mman.h>
33 # ifndef MMAP_THRESHOLD
34 # define MMAP_THRESHOLD 3 /* Minimum page count to mmap the file. */
37 #else /* No MMAP_FILE */
38 # undef MMAP_THRESHOLD
39 # define MMAP_THRESHOLD 0
46 /* If errno is inspected immediately after a system call fails, it will be
47 nonzero, and no error number will ever be zero. */
55 /* Suppress warning about function macros used w/o arguments in traditional
56 C. It is unlikely that glibc's strcmp macro helps this file at all. */
59 /* This structure is used for the table of all includes. */
62 const char *name
; /* actual path name of file */
63 const cpp_hashnode
*cmacro
; /* macro, if any, preventing reinclusion. */
64 const struct search_path
*foundhere
;
65 /* location in search path where file was
66 found, for #include_next and sysp. */
67 const unsigned char *buffer
; /* pointer to cached file contents */
68 struct stat st
; /* copy of stat(2) data for file */
69 int fd
; /* fd open on file (short term storage only) */
70 int err_no
; /* errno obtained if opening a file failed */
71 unsigned short include_count
; /* number of times file has been read */
72 unsigned short refcnt
; /* number of stacked buffers using this file */
73 unsigned char mapped
; /* file buffer is mmapped */
76 /* Variable length record files on VMS will have a stat size that includes
77 record control characters that won't be included in the read size. */
79 # define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */
80 # define STAT_SIZE_TOO_BIG(ST) ((ST).st_fab_rfm == FAB_C_VAR)
82 # define STAT_SIZE_TOO_BIG(ST) 0
85 /* The cmacro works like this: If it's NULL, the file is to be
86 included again. If it's NEVER_REREAD, the file is never to be
87 included again. Otherwise it is a macro hashnode, and the file is
88 to be included again if the macro is defined. */
89 #define NEVER_REREAD ((const cpp_hashnode *)-1)
90 #define DO_NOT_REREAD(inc) \
91 ((inc)->cmacro && ((inc)->cmacro == NEVER_REREAD \
92 || (inc)->cmacro->type == NT_MACRO))
93 #define NO_INCLUDE_PATH ((struct include_file *) -1)
95 static struct file_name_map
*read_name_map
96 PARAMS ((cpp_reader
*, const char *));
97 static char *read_filename_string
PARAMS ((int, FILE *));
98 static char *remap_filename
PARAMS ((cpp_reader
*, char *,
99 struct search_path
*));
100 static struct search_path
*search_from
PARAMS ((cpp_reader
*,
102 static struct include_file
*
103 find_include_file
PARAMS ((cpp_reader
*, const cpp_token
*,
105 static struct include_file
*open_file
PARAMS ((cpp_reader
*, const char *));
106 static int read_include_file
PARAMS ((cpp_reader
*, struct include_file
*));
107 static bool stack_include_file
PARAMS ((cpp_reader
*, struct include_file
*));
108 static void purge_cache
PARAMS ((struct include_file
*));
109 static void destroy_node
PARAMS ((splay_tree_value
));
110 static int report_missing_guard
PARAMS ((splay_tree_node
, void *));
111 static splay_tree_node find_or_create_entry
PARAMS ((cpp_reader
*,
113 static void handle_missing_header
PARAMS ((cpp_reader
*, const char *, int));
114 static int remove_component_p
PARAMS ((const char *));
116 /* Set up the splay tree we use to store information about all the
117 file names seen in this compilation. We also have entries for each
118 file we tried to open but failed; this saves system calls since we
119 don't try to open it again in future.
121 The key of each node is the file name, after processing by
122 _cpp_simplify_pathname. The path name may or may not be absolute.
123 The path string has been malloced, as is automatically freed by
124 registering free () as the splay tree key deletion function.
126 A node's value is a pointer to a struct include_file, and is never
129 _cpp_init_includes (pfile
)
132 pfile
->all_include_files
133 = splay_tree_new ((splay_tree_compare_fn
) strcmp
,
134 (splay_tree_delete_key_fn
) free
,
138 /* Tear down the splay tree. */
140 _cpp_cleanup_includes (pfile
)
143 splay_tree_delete (pfile
->all_include_files
);
146 /* Free a node. The path string is automatically freed. */
151 struct include_file
*f
= (struct include_file
*)v
;
160 /* Mark a file to not be reread (e.g. #import, read failure). */
162 _cpp_never_reread (file
)
163 struct include_file
*file
;
165 file
->cmacro
= NEVER_REREAD
;
168 /* Lookup a filename, which is simplified after making a copy, and
169 create an entry if none exists. errno is nonzero iff a (reported)
170 stat() error occurred during simplification. */
171 static splay_tree_node
172 find_or_create_entry (pfile
, fname
)
176 splay_tree_node node
;
177 struct include_file
*file
;
178 char *name
= xstrdup (fname
);
180 _cpp_simplify_pathname (name
);
181 node
= splay_tree_lookup (pfile
->all_include_files
, (splay_tree_key
) name
);
186 file
= xcnew (struct include_file
);
188 file
->err_no
= errno
;
189 node
= splay_tree_insert (pfile
->all_include_files
,
190 (splay_tree_key
) file
->name
,
191 (splay_tree_value
) file
);
197 /* Enter a file name in the splay tree, for the sake of cpp_included. */
199 _cpp_fake_include (pfile
, fname
)
203 find_or_create_entry (pfile
, fname
);
206 /* Given a file name, look it up in the cache; if there is no entry,
207 create one with a non-NULL value (regardless of success in opening
208 the file). If the file doesn't exist or is inaccessible, this
209 entry is flagged so we don't attempt to open it again in the
210 future. If the file isn't open, open it. The empty string is
211 interpreted as stdin.
213 Returns an include_file structure with an open file descriptor on
214 success, or NULL on failure. */
216 static struct include_file
*
217 open_file (pfile
, filename
)
219 const char *filename
;
221 splay_tree_node nd
= find_or_create_entry (pfile
, filename
);
222 struct include_file
*file
= (struct include_file
*) nd
->value
;
226 /* Ugh. handle_missing_header () needs errno to be set. */
227 errno
= file
->err_no
;
231 /* Don't reopen an idempotent file. */
232 if (DO_NOT_REREAD (file
))
235 /* Don't reopen one which is already loaded. */
236 if (file
->buffer
!= NULL
)
239 /* We used to open files in nonblocking mode, but that caused more
240 problems than it solved. Do take care not to acquire a
241 controlling terminal by mistake (this can't happen on sane
242 systems, but paranoia is a virtue).
244 Use the three-argument form of open even though we aren't
245 specifying O_CREAT, to defend against broken system headers.
247 O_BINARY tells some runtime libraries (notably DJGPP) not to do
248 newline translation; we can handle DOS line breaks just fine
251 Special case: the empty string is translated to stdin. */
253 if (filename
[0] == '\0')
256 file
->fd
= open (file
->name
, O_RDONLY
| O_NOCTTY
| O_BINARY
, 0666);
258 if (file
->fd
!= -1 && fstat (file
->fd
, &file
->st
) == 0)
260 if (!S_ISDIR (file
->st
.st_mode
))
262 /* If it's a directory, we return null and continue the search
263 as the file we're looking for may appear elsewhere in the
268 file
->err_no
= errno
;
272 /* Place the file referenced by INC into a new buffer on the buffer
273 stack, unless there are errors, or the file is not re-included
274 because of e.g. multiple-include guards. Returns true if a buffer
278 stack_include_file (pfile
, inc
)
280 struct include_file
*inc
;
284 const char *filename
;
286 if (DO_NOT_REREAD (inc
))
289 sysp
= MAX ((pfile
->map
? pfile
->map
->sysp
: 0),
290 (inc
->foundhere
? inc
->foundhere
->sysp
: 0));
292 /* For -M, add the file to the dependencies on its first inclusion. */
293 if (CPP_OPTION (pfile
, print_deps
) > sysp
&& !inc
->include_count
)
294 deps_add_dep (pfile
->deps
, inc
->name
);
299 if (read_include_file (pfile
, inc
))
301 /* If an error occurs, do not try to read this file again. */
302 _cpp_never_reread (inc
);
305 /* Mark a regular, zero-length file never-reread. We read it,
306 NUL-terminate it, and stack it once, so preprocessing a main
307 file of zero length does not raise an error. */
308 if (S_ISREG (inc
->st
.st_mode
) && inc
->st
.st_size
== 0)
309 _cpp_never_reread (inc
);
315 /* We don't want MI guard advice for the main file. */
316 inc
->include_count
++;
319 fp
= cpp_push_buffer (pfile
, inc
->buffer
, inc
->st
.st_size
,
320 /* from_stage3 */ CPP_OPTION (pfile
, preprocessed
), 0);
324 /* Initialise controlling macro state. */
325 pfile
->mi_valid
= true;
326 pfile
->mi_cmacro
= 0;
328 /* Generate the call back. */
329 filename
= inc
->name
;
330 if (*filename
== '\0')
331 filename
= _("<stdin>");
332 _cpp_do_file_change (pfile
, LC_ENTER
, filename
, 1, sysp
);
337 /* Read the file referenced by INC into the file cache.
339 If fd points to a plain file, we might be able to mmap it; we can
340 definitely allocate the buffer all at once. If fd is a pipe or
341 terminal, we can't do either. If fd is something weird, like a
342 block device, we don't want to read it at all.
344 Unfortunately, different systems use different st.st_mode values
345 for pipes: some have S_ISFIFO, some S_ISSOCK, some are buggy and
346 zero the entire struct stat except a couple fields. Hence we don't
347 even try to figure out what something is, except for plain files
350 FIXME: Flush file cache and try again if we run out of memory. */
353 read_include_file (pfile
, inc
)
355 struct include_file
*inc
;
357 ssize_t size
, offset
, count
;
360 static int pagesize
= -1;
363 if (S_ISREG (inc
->st
.st_mode
))
365 /* off_t might have a wider range than ssize_t - in other words,
366 the max size of a file might be bigger than the address
367 space. We can't handle a file that large. (Anyone with
368 a single source file bigger than 2GB needs to rethink
369 their coding style.) Some systems (e.g. AIX 4.1) define
370 SSIZE_MAX to be much smaller than the actual range of the
371 type. Use INTTYPE_MAXIMUM unconditionally to ensure this
373 if (inc
->st
.st_size
> INTTYPE_MAXIMUM (ssize_t
))
375 cpp_error (pfile
, "%s is too large", inc
->name
);
378 size
= inc
->st
.st_size
;
383 pagesize
= getpagesize ();
385 /* Use mmap if the file is big enough to be worth it (controlled
386 by MMAP_THRESHOLD) and if we can safely count on there being
387 at least one readable NUL byte after the end of the file's
388 contents. This is true for all tested operating systems when
389 the file size is not an exact multiple of the page size. */
390 if (size
/ pagesize
>= MMAP_THRESHOLD
391 && (size
% pagesize
) != 0)
393 buf
= (U_CHAR
*) mmap (0, size
, PROT_READ
, MAP_PRIVATE
, inc
->fd
, 0);
394 if (buf
== (U_CHAR
*)-1)
401 buf
= (U_CHAR
*) xmalloc (size
+ 1);
403 while (offset
< size
)
405 count
= read (inc
->fd
, buf
+ offset
, size
- offset
);
410 if (!STAT_SIZE_TOO_BIG (inc
->st
))
412 (pfile
, "%s is shorter than expected", inc
->name
);
413 buf
= xrealloc (buf
, offset
);
414 inc
->st
.st_size
= offset
;
419 /* The lexer requires that the buffer be NUL-terminated. */
423 else if (S_ISBLK (inc
->st
.st_mode
))
425 cpp_error (pfile
, "%s is a block device", inc
->name
);
430 /* 8 kilobytes is a sensible starting size. It ought to be
431 bigger than the kernel pipe buffer, and it's definitely
432 bigger than the majority of C source files. */
435 buf
= (U_CHAR
*) xmalloc (size
+ 1);
437 while ((count
= read (inc
->fd
, buf
+ offset
, size
- offset
)) > 0)
443 buf
= xrealloc (buf
, size
+ 1);
449 if (offset
+ 1 < size
)
450 buf
= xrealloc (buf
, offset
+ 1);
452 /* The lexer requires that the buffer be NUL-terminated. */
454 inc
->st
.st_size
= offset
;
461 cpp_error_from_errno (pfile
, inc
->name
);
468 struct include_file
*inc
;
474 munmap ((PTR
) inc
->buffer
, inc
->st
.st_size
);
477 free ((PTR
) inc
->buffer
);
482 /* Return 1 if the file named by FNAME has been included before in
483 any context, 0 otherwise. */
485 cpp_included (pfile
, fname
)
489 struct search_path
*path
;
493 if (IS_ABSOLUTE_PATHNAME (fname
))
495 /* Just look it up. */
496 nd
= splay_tree_lookup (pfile
->all_include_files
, (splay_tree_key
) fname
);
497 return (nd
&& nd
->value
);
500 /* Search directory path for the file. */
501 name
= (char *) alloca (strlen (fname
) + pfile
->max_include_len
+ 2);
502 for (path
= CPP_OPTION (pfile
, quote_include
); path
; path
= path
->next
)
504 memcpy (name
, path
->name
, path
->len
);
505 name
[path
->len
] = '/';
506 strcpy (&name
[path
->len
+ 1], fname
);
507 if (CPP_OPTION (pfile
, remap
))
508 n
= remap_filename (pfile
, name
, path
);
512 nd
= splay_tree_lookup (pfile
->all_include_files
, (splay_tree_key
) n
);
519 /* Search for HEADER. Return 0 if there is no such file (or it's
520 un-openable), in which case an error code will be in errno. If
521 there is no include path to use it returns NO_INCLUDE_PATH,
522 otherwise an include_file structure. If this request originates
523 from a #include_next directive, set INCLUDE_NEXT to true. */
525 static struct include_file
*
526 find_include_file (pfile
, header
, type
)
528 const cpp_token
*header
;
529 enum include_type type
;
531 const char *fname
= (const char *) header
->val
.str
.text
;
532 struct search_path
*path
;
533 struct include_file
*file
;
536 if (IS_ABSOLUTE_PATHNAME (fname
))
537 return open_file (pfile
, fname
);
539 /* For #include_next, skip in the search path past the dir in which
540 the current file was found, but if it was found via an absolute
541 path use the normal search logic. */
542 if (type
== IT_INCLUDE_NEXT
&& pfile
->buffer
->inc
->foundhere
)
543 path
= pfile
->buffer
->inc
->foundhere
->next
;
544 else if (header
->type
== CPP_HEADER_NAME
)
545 path
= CPP_OPTION (pfile
, bracket_include
);
547 path
= search_from (pfile
, type
);
551 cpp_error (pfile
, "no include path in which to find %s", fname
);
552 return NO_INCLUDE_PATH
;
555 /* Search directory path for the file. */
556 name
= (char *) alloca (strlen (fname
) + pfile
->max_include_len
+ 2);
557 for (; path
; path
= path
->next
)
559 memcpy (name
, path
->name
, path
->len
);
560 name
[path
->len
] = '/';
561 strcpy (&name
[path
->len
+ 1], fname
);
562 if (CPP_OPTION (pfile
, remap
))
563 n
= remap_filename (pfile
, name
, path
);
567 file
= open_file (pfile
, n
);
570 file
->foundhere
= path
;
578 /* Not everyone who wants to set system-header-ness on a buffer can
579 see the details of a buffer. This is an exported interface because
580 fix-header needs it. */
582 cpp_make_system_header (pfile
, syshdr
, externc
)
588 /* 1 = system header, 2 = system header to be treated as C. */
590 flags
= 1 + (externc
!= 0);
591 _cpp_do_file_change (pfile
, LC_RENAME
, pfile
->map
->to_file
,
592 SOURCE_LINE (pfile
->map
, pfile
->line
), flags
);
595 /* Report on all files that might benefit from a multiple include guard.
598 _cpp_report_missing_guards (pfile
)
602 splay_tree_foreach (pfile
->all_include_files
, report_missing_guard
,
607 report_missing_guard (n
, b
)
611 struct include_file
*f
= (struct include_file
*) n
->value
;
612 int *bannerp
= (int *)b
;
614 if (f
&& f
->cmacro
== 0 && f
->include_count
== 1)
618 fputs (_("Multiple include guards may be useful for:\n"), stderr
);
621 fputs (f
->name
, stderr
);
627 /* Create a dependency, or issue an error message as appropriate. */
629 handle_missing_header (pfile
, fname
, angle_brackets
)
634 int print_dep
= CPP_PRINT_DEPS(pfile
) > (angle_brackets
|| pfile
->map
->sysp
);
636 if (CPP_OPTION (pfile
, print_deps_missing_files
) && print_dep
)
638 if (!angle_brackets
|| IS_ABSOLUTE_PATHNAME (fname
))
639 deps_add_dep (pfile
->deps
, fname
);
642 /* If requested as a system header, assume it belongs in
643 the first system header directory. */
644 struct search_path
*ptr
= CPP_OPTION (pfile
, bracket_include
);
646 int len
= 0, fname_len
= strlen (fname
);
651 p
= (char *) alloca (len
+ fname_len
+ 2);
654 memcpy (p
, ptr
->name
, len
);
657 memcpy (p
+ len
, fname
, fname_len
+ 1);
658 deps_add_dep (pfile
->deps
, p
);
661 /* If -M was specified, then don't count this as an error, because
662 we can still produce correct output. Otherwise, we can't produce
663 correct output, because there may be dependencies we need inside
664 the missing file, and we don't know what directory this missing
665 file exists in. FIXME: Use a future cpp_diagnostic_with_errno ()
666 for both of these cases. */
667 else if (CPP_PRINT_DEPS (pfile
) && ! print_dep
)
668 cpp_warning (pfile
, "%s: %s", fname
, xstrerror (errno
));
670 cpp_error_from_errno (pfile
, fname
);
673 /* Handles #include-family directives, and the command line -imacros
674 and -include. Returns true if a buffer was stacked. */
676 _cpp_execute_include (pfile
, header
, type
)
678 const cpp_token
*header
;
679 enum include_type type
;
681 bool stacked
= false;
682 struct include_file
*inc
= find_include_file (pfile
, header
, type
);
685 handle_missing_header (pfile
, (const char *) header
->val
.str
.text
,
686 header
->type
== CPP_HEADER_NAME
);
687 else if (inc
!= NO_INCLUDE_PATH
)
689 stacked
= stack_include_file (pfile
, inc
);
691 if (type
== IT_IMPORT
)
692 _cpp_never_reread (inc
);
698 /* Locate HEADER, and determine whether it is newer than the current
699 file. If it cannot be located or dated, return -1, if it is newer
700 newer, return 1, otherwise 0. */
702 _cpp_compare_file_date (pfile
, header
)
704 const cpp_token
*header
;
706 struct include_file
*inc
= find_include_file (pfile
, header
, 0);
708 if (inc
== NULL
|| inc
== NO_INCLUDE_PATH
)
717 return inc
->st
.st_mtime
> pfile
->buffer
->inc
->st
.st_mtime
;
721 /* Push an input buffer and load it up with the contents of FNAME. If
722 FNAME is "", read standard input. Return true if a buffer was
725 _cpp_read_file (pfile
, fname
)
729 struct include_file
*f
= open_file (pfile
, fname
);
733 cpp_error_from_errno (pfile
, fname
);
737 return stack_include_file (pfile
, f
);
740 /* Do appropriate cleanup when a file buffer is popped off the input
741 stack. Push the next -include file, if any remain. */
743 _cpp_pop_file_buffer (pfile
, inc
)
745 struct include_file
*inc
;
747 /* Record the inclusion-preventing macro, which could be NULL
748 meaning no controlling macro. */
749 if (pfile
->mi_valid
&& inc
->cmacro
== NULL
)
750 inc
->cmacro
= pfile
->mi_cmacro
;
752 /* Invalidate control macros in the #including file. */
753 pfile
->mi_valid
= false;
756 if (inc
->refcnt
== 0 && DO_NOT_REREAD (inc
))
759 /* Don't generate a callback for popping the main file. */
762 _cpp_do_file_change (pfile
, LC_LEAVE
, 0, 0, 0);
764 /* Finally, push the next -included file, if any. */
765 if (!pfile
->buffer
->prev
)
766 _cpp_push_next_buffer (pfile
);
770 /* Returns the first place in the include chain to start searching for
771 "" includes. This involves stripping away the basename of the
772 current file, unless -I- was specified.
774 If we're handling -include or -imacros, use the "" chain, but with
775 the preprocessor's cwd prepended. */
776 static struct search_path
*
777 search_from (pfile
, type
)
779 enum include_type type
;
781 cpp_buffer
*buffer
= pfile
->buffer
;
784 /* Command line uses the cwd, and does not cache the result. */
785 if (type
== IT_CMDLINE
)
788 /* Ignore the current file's directory if -I- was given. */
789 if (CPP_OPTION (pfile
, ignore_srcdir
))
790 return CPP_OPTION (pfile
, quote_include
);
792 if (! buffer
->search_cached
)
794 buffer
->search_cached
= 1;
796 dlen
= lbasename (buffer
->inc
->name
) - buffer
->inc
->name
;
800 /* We don't guarantee NAME is null-terminated. This saves
801 allocating and freeing memory. Drop a trailing '/'. */
802 buffer
->dir
.name
= buffer
->inc
->name
;
809 buffer
->dir
.name
= ".";
813 if (dlen
> pfile
->max_include_len
)
814 pfile
->max_include_len
= dlen
;
816 buffer
->dir
.len
= dlen
;
817 buffer
->dir
.next
= CPP_OPTION (pfile
, quote_include
);
818 buffer
->dir
.sysp
= pfile
->map
->sysp
;
824 /* The file_name_map structure holds a mapping of file names for a
825 particular directory. This mapping is read from the file named
826 FILE_NAME_MAP_FILE in that directory. Such a file can be used to
827 map filenames on a file system with severe filename restrictions,
828 such as DOS. The format of the file name map file is just a series
829 of lines with two tokens on each line. The first token is the name
830 to map, and the second token is the actual name to use. */
834 struct file_name_map
*map_next
;
839 #define FILE_NAME_MAP_FILE "header.gcc"
841 /* Read a space delimited string of unlimited length from a stdio
845 read_filename_string (ch
, f
)
853 set
= alloc
= xmalloc (len
+ 1);
857 while ((ch
= getc (f
)) != EOF
&& ! is_space(ch
))
859 if (set
- alloc
== len
)
862 alloc
= xrealloc (alloc
, len
+ 1);
863 set
= alloc
+ len
/ 2;
873 /* This structure holds a linked list of file name maps, one per directory. */
875 struct file_name_map_list
877 struct file_name_map_list
*map_list_next
;
879 struct file_name_map
*map_list_map
;
882 /* Read the file name map file for DIRNAME. */
884 static struct file_name_map
*
885 read_name_map (pfile
, dirname
)
889 struct file_name_map_list
*map_list_ptr
;
893 /* Check the cache of directories, and mappings in their remap file. */
894 for (map_list_ptr
= CPP_OPTION (pfile
, map_list
); map_list_ptr
;
895 map_list_ptr
= map_list_ptr
->map_list_next
)
896 if (! strcmp (map_list_ptr
->map_list_name
, dirname
))
897 return map_list_ptr
->map_list_map
;
899 map_list_ptr
= ((struct file_name_map_list
*)
900 xmalloc (sizeof (struct file_name_map_list
)));
901 map_list_ptr
->map_list_name
= xstrdup (dirname
);
903 /* The end of the list ends in NULL. */
904 map_list_ptr
->map_list_map
= NULL
;
906 name
= (char *) alloca (strlen (dirname
) + strlen (FILE_NAME_MAP_FILE
) + 2);
907 strcpy (name
, dirname
);
910 strcat (name
, FILE_NAME_MAP_FILE
);
911 f
= fopen (name
, "r");
913 /* Silently return NULL if we cannot open. */
917 int dirlen
= strlen (dirname
);
919 while ((ch
= getc (f
)) != EOF
)
922 struct file_name_map
*ptr
;
926 from
= read_filename_string (ch
, f
);
927 while ((ch
= getc (f
)) != EOF
&& is_hspace(ch
))
929 to
= read_filename_string (ch
, f
);
931 ptr
= ((struct file_name_map
*)
932 xmalloc (sizeof (struct file_name_map
)));
933 ptr
->map_from
= from
;
935 /* Make the real filename absolute. */
936 if (IS_ABSOLUTE_PATHNAME (to
))
940 ptr
->map_to
= xmalloc (dirlen
+ strlen (to
) + 2);
941 strcpy (ptr
->map_to
, dirname
);
942 ptr
->map_to
[dirlen
] = '/';
943 strcpy (ptr
->map_to
+ dirlen
+ 1, to
);
947 ptr
->map_next
= map_list_ptr
->map_list_map
;
948 map_list_ptr
->map_list_map
= ptr
;
950 while ((ch
= getc (f
)) != '\n')
957 /* Add this information to the cache. */
958 map_list_ptr
->map_list_next
= CPP_OPTION (pfile
, map_list
);
959 CPP_OPTION (pfile
, map_list
) = map_list_ptr
;
961 return map_list_ptr
->map_list_map
;
964 /* Remap an unsimplified path NAME based on the file_name_map (if any)
967 remap_filename (pfile
, name
, loc
)
970 struct search_path
*loc
;
972 struct file_name_map
*map
;
973 const char *from
, *p
;
978 /* Get a null-terminated path. */
979 char *dname
= alloca (loc
->len
+ 1);
980 memcpy (dname
, loc
->name
, loc
->len
);
981 dname
[loc
->len
] = '\0';
983 loc
->name_map
= read_name_map (pfile
, dname
);
988 /* This works since NAME has not been simplified yet. */
989 from
= name
+ loc
->len
+ 1;
991 for (map
= loc
->name_map
; map
; map
= map
->map_next
)
992 if (!strcmp (map
->map_from
, from
))
995 /* Try to find a mapping file for the particular directory we are
996 looking in. Thus #include <sys/types.h> will look up sys/types.h
997 in /usr/include/header.gcc and look up types.h in
998 /usr/include/sys/header.gcc. */
999 p
= strrchr (name
, '/');
1003 /* We know p != name as absolute paths don't call remap_filename. */
1005 cpp_ice (pfile
, "absolute file name in remap_filename");
1007 dir
= (char *) alloca (p
- name
+ 1);
1008 memcpy (dir
, name
, p
- name
);
1009 dir
[p
- name
] = '\0';
1012 for (map
= read_name_map (pfile
, dir
); map
; map
= map
->map_next
)
1013 if (! strcmp (map
->map_from
, from
))
1019 /* Returns true if it is safe to remove the final component of path,
1020 when it is followed by a ".." component. We use lstat to avoid
1021 symlinks if we have it. If not, we can still catch errors with
1024 remove_component_p (path
)
1031 result
= lstat (path
, &s
);
1033 result
= stat (path
, &s
);
1036 /* There's no guarantee that errno will be unchanged, even on
1037 success. Cygwin's lstat(), for example, will often set errno to
1038 ENOSYS. In case of success, reset errno to zero. */
1042 return result
== 0 && S_ISDIR (s
.st_mode
);
1045 /* Simplify a path name in place, deleting redundant components. This
1046 reduces OS overhead and guarantees that equivalent paths compare
1047 the same (modulo symlinks).
1050 foo/bar/../quux foo/quux
1054 //quux //quux (POSIX allows leading // as a namespace escape)
1056 Guarantees no trailing slashes. All transforms reduce the length
1057 of the string. Returns PATH. errno is 0 if no error occurred;
1058 nonzero if an error occurred when using stat () or lstat (). */
1061 _cpp_simplify_pathname (path
)
1066 char *base
, *orig_base
;
1070 /* Don't overflow the empty path by putting a '.' in it below. */
1074 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
1075 /* Convert all backslashes to slashes. */
1076 for (from
= path
; *from
; from
++)
1077 if (*from
== '\\') *from
= '/';
1079 /* Skip over leading drive letter if present. */
1080 if (ISALPHA (path
[0]) && path
[1] == ':')
1081 from
= to
= &path
[2];
1088 /* Remove redundant leading /s. */
1097 /* 3 or more initial /s are equivalent to 1 /. */
1098 while (*++from
== '/');
1100 /* On some hosts // differs from /; Posix allows this. */
1105 base
= orig_base
= to
;
1110 while (*from
== '/')
1118 if (from
[1] == '\0')
1125 else if (from
[1] == '.' && (from
[2] == '/' || from
[2] == '\0'))
1127 /* Don't simplify if there was no previous component. */
1128 if (absolute
&& orig_base
== to
)
1133 /* Don't simplify if the previous component was "../",
1134 or if an error has already occurred with (l)stat. */
1135 if (base
!= to
&& errno
== 0)
1137 /* We don't back up if it's a symlink. */
1139 if (remove_component_p (path
))
1141 while (to
> base
&& *to
!= '/')
1151 /* Add the component separator. */
1155 /* Copy this component until the trailing null or '/'. */
1156 while (*from
!= '\0' && *from
!= '/')
1163 /* Change the empty string to "." so that it is not treated as stdin.