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 unsigned short include_count
; /* number of times file has been read */
71 unsigned short refcnt
; /* number of stacked buffers using this file */
72 unsigned char mapped
; /* file buffer is mmapped */
75 /* The cmacro works like this: If it's NULL, the file is to be
76 included again. If it's NEVER_REREAD, the file is never to be
77 included again. Otherwise it is a macro hashnode, and the file is
78 to be included again if the macro is defined. */
79 #define NEVER_REREAD ((const cpp_hashnode *)-1)
80 #define DO_NOT_REREAD(inc) \
81 ((inc)->cmacro && ((inc)->cmacro == NEVER_REREAD \
82 || (inc)->cmacro->type == NT_MACRO))
83 #define NO_INCLUDE_PATH ((struct include_file *) -1)
85 static struct file_name_map
*read_name_map
86 PARAMS ((cpp_reader
*, const char *));
87 static char *read_filename_string
PARAMS ((int, FILE *));
88 static char *remap_filename
PARAMS ((cpp_reader
*, char *,
89 struct search_path
*));
90 static struct search_path
*search_from
PARAMS ((cpp_reader
*,
92 static struct include_file
*
93 find_include_file
PARAMS ((cpp_reader
*, const cpp_token
*,
95 static struct include_file
*open_file
PARAMS ((cpp_reader
*, const char *));
96 static int read_include_file
PARAMS ((cpp_reader
*, struct include_file
*));
97 static void stack_include_file
PARAMS ((cpp_reader
*, struct include_file
*));
98 static void purge_cache
PARAMS ((struct include_file
*));
99 static void destroy_node
PARAMS ((splay_tree_value
));
100 static int report_missing_guard
PARAMS ((splay_tree_node
, void *));
101 static splay_tree_node find_or_create_entry
PARAMS ((cpp_reader
*,
103 static void handle_missing_header
PARAMS ((cpp_reader
*, const char *, int));
105 /* Set up the splay tree we use to store information about all the
106 file names seen in this compilation. We also have entries for each
107 file we tried to open but failed; this saves system calls since we
108 don't try to open it again in future.
110 The key of each node is the file name, after processing by
111 _cpp_simplify_pathname. The path name may or may not be absolute.
112 The path string has been malloced, as is automatically freed by
113 registering free () as the splay tree key deletion function.
115 A node's value is a pointer to a struct include_file, and is never
118 _cpp_init_includes (pfile
)
121 pfile
->all_include_files
122 = splay_tree_new ((splay_tree_compare_fn
) strcmp
,
123 (splay_tree_delete_key_fn
) free
,
127 /* Tear down the splay tree. */
129 _cpp_cleanup_includes (pfile
)
132 splay_tree_delete (pfile
->all_include_files
);
135 /* Free a node. The path string is automatically freed. */
140 struct include_file
*f
= (struct include_file
*)v
;
149 /* Mark a file to not be reread (e.g. #import, read failure). */
151 _cpp_never_reread (file
)
152 struct include_file
*file
;
154 file
->cmacro
= NEVER_REREAD
;
157 /* Lookup a filename, which is simplified after making a copy, and
158 create an entry if none exists. */
159 static splay_tree_node
160 find_or_create_entry (pfile
, fname
)
164 splay_tree_node node
;
165 struct include_file
*file
;
166 char *name
= xstrdup (fname
);
168 _cpp_simplify_pathname (name
);
169 node
= splay_tree_lookup (pfile
->all_include_files
, (splay_tree_key
) name
);
174 file
= xcnew (struct include_file
);
176 node
= splay_tree_insert (pfile
->all_include_files
,
177 (splay_tree_key
) file
->name
,
178 (splay_tree_value
) file
);
184 /* Enter a file name in the splay tree, for the sake of cpp_included. */
186 _cpp_fake_include (pfile
, fname
)
190 find_or_create_entry (pfile
, fname
);
193 /* Given a file name, look it up in the cache; if there is no entry,
194 create one with a non-NULL value (regardless of success in opening
195 the file). If the file doesn't exist or is inaccessible, this
196 entry is flagged so we don't attempt to open it again in the
197 future. If the file isn't open, open it. The empty string is
198 interpreted as stdin.
200 Returns an include_file structure with an open file descriptor on
201 success, or NULL on failure. */
203 static struct include_file
*
204 open_file (pfile
, filename
)
206 const char *filename
;
208 splay_tree_node nd
= find_or_create_entry (pfile
, filename
);
209 struct include_file
*file
= (struct include_file
*) nd
->value
;
211 /* Don't retry opening if we failed previously. */
215 /* Don't reopen an idempotent file. */
216 if (DO_NOT_REREAD (file
))
219 /* Don't reopen one which is already loaded. */
220 if (file
->buffer
!= NULL
)
223 /* We used to open files in nonblocking mode, but that caused more
224 problems than it solved. Do take care not to acquire a
225 controlling terminal by mistake (this can't happen on sane
226 systems, but paranoia is a virtue).
228 Use the three-argument form of open even though we aren't
229 specifying O_CREAT, to defend against broken system headers.
231 O_BINARY tells some runtime libraries (notably DJGPP) not to do
232 newline translation; we can handle DOS line breaks just fine
235 Special case: the empty string is translated to stdin. */
237 if (filename
[0] == '\0')
240 file
->fd
= open (file
->name
, O_RDONLY
| O_NOCTTY
| O_BINARY
, 0666);
242 if (file
->fd
!= -1 && fstat (file
->fd
, &file
->st
) == 0)
244 /* If it's a directory, we return null and continue the search
245 as the file we're looking for may appear elsewhere in the
247 if (S_ISDIR (file
->st
.st_mode
))
251 /* Mark a regular, zero-length file never-reread now. */
252 if (S_ISREG (file
->st
.st_mode
) && file
->st
.st_size
== 0)
254 _cpp_never_reread (file
);
263 /* Don't issue an error message if the file doesn't exist. */
264 if (errno
!= ENOENT
&& errno
!= ENOTDIR
)
265 cpp_error_from_errno (pfile
, file
->name
);
267 /* Create a negative node for this path, and return null. */
273 /* Place the file referenced by INC into a new buffer on PFILE's
274 stack. If there are errors, or the file should not be re-included,
275 a null (zero-length) buffer is pushed. */
278 stack_include_file (pfile
, inc
)
280 struct include_file
*inc
;
286 /* We'll try removing deps_sysp after the release of 3.0. */
287 deps_sysp
= pfile
->system_include_depth
!= 0;
288 sysp
= MAX ((pfile
->buffer
? pfile
->buffer
->sysp
: 0),
289 (inc
->foundhere
? inc
->foundhere
->sysp
: 0));
291 /* For -M, add the file to the dependencies on its first inclusion. */
292 if (CPP_OPTION (pfile
, print_deps
) > deps_sysp
&& !inc
->include_count
)
293 deps_add_dep (pfile
->deps
, inc
->name
);
296 if (! DO_NOT_REREAD (inc
) && ! inc
->buffer
)
298 /* If an error occurs, do not try to read this file again. */
299 if (read_include_file (pfile
, inc
))
300 _cpp_never_reread (inc
);
305 if (! DO_NOT_REREAD (inc
))
307 len
= inc
->st
.st_size
;
310 /* We don't want MI guard advice for the main file. */
311 inc
->include_count
++;
313 /* Handle -H option. */
314 if (CPP_OPTION (pfile
, print_include_names
))
316 for (fp
= pfile
->buffer
; fp
; fp
= fp
->prev
)
318 fprintf (stderr
, " %s\n", inc
->name
);
324 fp
= cpp_push_buffer (pfile
, inc
->buffer
, len
, BUF_FILE
, inc
->name
);
329 /* Initialise controlling macro state. */
330 pfile
->mi_state
= MI_OUTSIDE
;
331 pfile
->mi_cmacro
= 0;
332 pfile
->include_depth
++;
334 /* Generate the call back. */
336 _cpp_do_file_change (pfile
, FC_ENTER
, 0, 0);
340 /* Read the file referenced by INC into the file cache.
342 If fd points to a plain file, we might be able to mmap it; we can
343 definitely allocate the buffer all at once. If fd is a pipe or
344 terminal, we can't do either. If fd is something weird, like a
345 block device, we don't want to read it at all.
347 Unfortunately, different systems use different st.st_mode values
348 for pipes: some have S_ISFIFO, some S_ISSOCK, some are buggy and
349 zero the entire struct stat except a couple fields. Hence we don't
350 even try to figure out what something is, except for plain files
353 FIXME: Flush file cache and try again if we run out of memory. */
356 read_include_file (pfile
, inc
)
358 struct include_file
*inc
;
360 ssize_t size
, offset
, count
;
363 static int pagesize
= -1;
366 if (S_ISREG (inc
->st
.st_mode
))
368 /* off_t might have a wider range than ssize_t - in other words,
369 the max size of a file might be bigger than the address
370 space. We can't handle a file that large. (Anyone with
371 a single source file bigger than 2GB needs to rethink
372 their coding style.) Some systems (e.g. AIX 4.1) define
373 SSIZE_MAX to be much smaller than the actual range of the
374 type. Use INTTYPE_MAXIMUM unconditionally to ensure this
376 if (inc
->st
.st_size
> INTTYPE_MAXIMUM (ssize_t
))
378 cpp_error (pfile
, "%s is too large", inc
->name
);
381 size
= inc
->st
.st_size
;
386 pagesize
= getpagesize ();
388 if (size
/ pagesize
>= MMAP_THRESHOLD
)
390 buf
= (U_CHAR
*) mmap (0, size
, PROT_READ
, MAP_PRIVATE
, inc
->fd
, 0);
391 if (buf
== (U_CHAR
*)-1)
398 buf
= (U_CHAR
*) xmalloc (size
);
400 while (offset
< size
)
402 count
= read (inc
->fd
, buf
+ offset
, size
- offset
);
407 cpp_warning (pfile
, "%s is shorter than expected", inc
->name
);
414 else if (S_ISBLK (inc
->st
.st_mode
))
416 cpp_error (pfile
, "%s is a block device", inc
->name
);
421 /* 8 kilobytes is a sensible starting size. It ought to be
422 bigger than the kernel pipe buffer, and it's definitely
423 bigger than the majority of C source files. */
426 buf
= (U_CHAR
*) xmalloc (size
);
428 while ((count
= read (inc
->fd
, buf
+ offset
, size
- offset
)) > 0)
432 buf
= xrealloc (buf
, (size
*= 2));
438 buf
= xrealloc (buf
, offset
);
439 inc
->st
.st_size
= offset
;
446 cpp_error_from_errno (pfile
, inc
->name
);
453 struct include_file
*inc
;
459 munmap ((PTR
) inc
->buffer
, inc
->st
.st_size
);
462 free ((PTR
) inc
->buffer
);
467 /* Return 1 if the file named by FNAME has been included before in
468 any context, 0 otherwise. */
470 cpp_included (pfile
, fname
)
474 struct search_path
*path
;
478 if (IS_ABSOLUTE_PATHNAME (fname
))
480 /* Just look it up. */
481 nd
= splay_tree_lookup (pfile
->all_include_files
, (splay_tree_key
) fname
);
482 return (nd
&& nd
->value
);
485 /* Search directory path for the file. */
486 name
= (char *) alloca (strlen (fname
) + pfile
->max_include_len
+ 2);
487 for (path
= CPP_OPTION (pfile
, quote_include
); path
; path
= path
->next
)
489 memcpy (name
, path
->name
, path
->len
);
490 name
[path
->len
] = '/';
491 strcpy (&name
[path
->len
+ 1], fname
);
492 if (CPP_OPTION (pfile
, remap
))
493 n
= remap_filename (pfile
, name
, path
);
497 nd
= splay_tree_lookup (pfile
->all_include_files
, (splay_tree_key
) n
);
504 /* Search for HEADER. Return 0 if there is no such file (or it's
505 un-openable), in which case an error code will be in errno. If
506 there is no include path to use it returns NO_INCLUDE_PATH,
507 otherwise an include_file structure. If this request originates
508 from a #include_next directive, set INCLUDE_NEXT to true. */
510 static struct include_file
*
511 find_include_file (pfile
, header
, type
)
513 const cpp_token
*header
;
514 enum include_type type
;
516 const char *fname
= (const char *) header
->val
.str
.text
;
517 struct search_path
*path
;
518 struct include_file
*file
;
521 if (IS_ABSOLUTE_PATHNAME (fname
))
522 return open_file (pfile
, fname
);
524 /* For #include_next, skip in the search path past the dir in which
525 the current file was found, but if it was found via an absolute
526 path use the normal search logic. */
527 if (type
== IT_INCLUDE_NEXT
&& pfile
->buffer
->inc
->foundhere
)
528 path
= pfile
->buffer
->inc
->foundhere
->next
;
529 else if (header
->type
== CPP_HEADER_NAME
)
530 path
= CPP_OPTION (pfile
, bracket_include
);
532 path
= search_from (pfile
, type
);
536 cpp_error (pfile
, "No include path in which to find %s", fname
);
537 return NO_INCLUDE_PATH
;
540 /* Search directory path for the file. */
541 name
= (char *) alloca (strlen (fname
) + pfile
->max_include_len
+ 2);
542 for (; path
; path
= path
->next
)
544 memcpy (name
, path
->name
, path
->len
);
545 name
[path
->len
] = '/';
546 strcpy (&name
[path
->len
+ 1], fname
);
547 if (CPP_OPTION (pfile
, remap
))
548 n
= remap_filename (pfile
, name
, path
);
552 file
= open_file (pfile
, n
);
555 file
->foundhere
= path
;
563 /* Not everyone who wants to set system-header-ness on a buffer can
564 see the details of a buffer. This is an exported interface because
565 fix-header needs it. */
567 cpp_make_system_header (pfile
, syshdr
, externc
)
573 /* 1 = system header, 2 = system header to be treated as C. */
575 flags
= 1 + (externc
!= 0);
576 pfile
->buffer
->sysp
= flags
;
577 _cpp_do_file_change (pfile
, FC_RENAME
, pfile
->buffer
->nominal_fname
,
578 pfile
->buffer
->lineno
);
581 /* Report on all files that might benefit from a multiple include guard.
584 _cpp_report_missing_guards (pfile
)
588 splay_tree_foreach (pfile
->all_include_files
, report_missing_guard
,
593 report_missing_guard (n
, b
)
597 struct include_file
*f
= (struct include_file
*) n
->value
;
598 int *bannerp
= (int *)b
;
600 if (f
&& f
->cmacro
== 0 && f
->include_count
== 1)
604 fputs (_("Multiple include guards may be useful for:\n"), stderr
);
607 fputs (f
->name
, stderr
);
613 /* Create a dependency, or issue an error message as appropriate. */
615 handle_missing_header (pfile
, fname
, angle_brackets
)
620 /* We will try making the RHS pfile->buffer->sysp after 3.0. */
621 int print_dep
= CPP_PRINT_DEPS(pfile
) > (angle_brackets
622 || pfile
->system_include_depth
);
624 if (CPP_OPTION (pfile
, print_deps_missing_files
) && print_dep
)
626 if (!angle_brackets
|| IS_ABSOLUTE_PATHNAME (fname
))
627 deps_add_dep (pfile
->deps
, fname
);
630 /* If requested as a system header, assume it belongs in
631 the first system header directory. */
632 struct search_path
*ptr
= CPP_OPTION (pfile
, bracket_include
);
634 int len
= 0, fname_len
= strlen (fname
);
639 p
= (char *) alloca (len
+ fname_len
+ 2);
642 memcpy (p
, ptr
->name
, len
);
645 memcpy (p
+ len
, fname
, fname_len
+ 1);
646 _cpp_simplify_pathname (p
);
647 deps_add_dep (pfile
->deps
, p
);
650 /* If -M was specified, then don't count this as an error, because
651 we can still produce correct output. Otherwise, we can't produce
652 correct output, because there may be dependencies we need inside
653 the missing file, and we don't know what directory this missing
654 file exists in. FIXME: Use a future cpp_diagnotic_with_errno ()
655 for both of these cases. */
656 else if (CPP_PRINT_DEPS (pfile
) && ! print_dep
)
657 cpp_warning (pfile
, "%s: %s", fname
, xstrerror (errno
));
659 cpp_error_from_errno (pfile
, fname
);
662 /* Returns non-zero if a buffer was stacked. */
664 _cpp_execute_include (pfile
, header
, type
)
666 const cpp_token
*header
;
667 enum include_type type
;
669 struct include_file
*inc
= find_include_file (pfile
, header
, type
);
672 handle_missing_header (pfile
, (const char *) header
->val
.str
.text
,
673 header
->type
== CPP_HEADER_NAME
);
674 else if (inc
!= NO_INCLUDE_PATH
)
676 if (header
->type
== CPP_HEADER_NAME
)
677 pfile
->system_include_depth
++;
679 stack_include_file (pfile
, inc
);
681 if (type
== IT_IMPORT
)
682 _cpp_never_reread (inc
);
690 /* Locate HEADER, and determine whether it is newer than the current
691 file. If it cannot be located or dated, return -1, if it is newer
692 newer, return 1, otherwise 0. */
694 _cpp_compare_file_date (pfile
, header
)
696 const cpp_token
*header
;
698 struct include_file
*inc
= find_include_file (pfile
, header
, 0);
700 if (inc
== NULL
|| inc
== NO_INCLUDE_PATH
)
709 return inc
->st
.st_mtime
> pfile
->buffer
->inc
->st
.st_mtime
;
713 /* Push an input buffer and load it up with the contents of FNAME.
714 If FNAME is "", read standard input. */
716 _cpp_read_file (pfile
, fname
)
720 struct include_file
*f
= open_file (pfile
, fname
);
724 cpp_error_from_errno (pfile
, fname
);
728 stack_include_file (pfile
, f
);
732 /* Do appropriate cleanup when a file buffer is popped off the input
735 _cpp_pop_file_buffer (pfile
, buf
)
739 struct include_file
*inc
= buf
->inc
;
741 if (pfile
->system_include_depth
)
742 pfile
->system_include_depth
--;
743 if (pfile
->include_depth
)
744 pfile
->include_depth
--;
746 /* Record the inclusion-preventing macro, which could be NULL
747 meaning no controlling macro, if we haven't got it already. */
748 if (pfile
->mi_state
== MI_OUTSIDE
&& inc
->cmacro
== NULL
)
749 inc
->cmacro
= pfile
->mi_cmacro
;
751 /* Invalidate control macros in the #including file. */
752 pfile
->mi_state
= MI_FAILED
;
755 if (inc
->refcnt
== 0 && DO_NOT_REREAD (inc
))
759 /* Returns the first place in the include chain to start searching for
760 "" includes. This involves stripping away the basename of the
761 current file, unless -I- was specified.
763 If we're handling -include or -imacros, use the "" chain, but with
764 the preprocessor's cwd prepended. */
765 static struct search_path
*
766 search_from (pfile
, type
)
768 enum include_type type
;
770 cpp_buffer
*buffer
= pfile
->buffer
;
773 /* Command line uses the cwd, and does not cache the result. */
774 if (type
== IT_CMDLINE
)
777 /* Ignore the current file's directory if -I- was given. */
778 if (CPP_OPTION (pfile
, ignore_srcdir
))
779 return CPP_OPTION (pfile
, quote_include
);
781 if (! buffer
->search_cached
)
783 buffer
->search_cached
= 1;
785 dlen
= lbasename (buffer
->inc
->name
) - buffer
->inc
->name
;
789 /* We don't guarantee NAME is null-terminated. This saves
790 allocating and freeing memory, and duplicating it when faking
791 buffers in cpp_push_buffer. Drop a trailing '/'. */
792 buffer
->dir
.name
= buffer
->inc
->name
;
799 buffer
->dir
.name
= ".";
803 if (dlen
> pfile
->max_include_len
)
804 pfile
->max_include_len
= dlen
;
806 buffer
->dir
.len
= dlen
;
807 buffer
->dir
.next
= CPP_OPTION (pfile
, quote_include
);
808 buffer
->dir
.sysp
= buffer
->sysp
;
814 /* The file_name_map structure holds a mapping of file names for a
815 particular directory. This mapping is read from the file named
816 FILE_NAME_MAP_FILE in that directory. Such a file can be used to
817 map filenames on a file system with severe filename restrictions,
818 such as DOS. The format of the file name map file is just a series
819 of lines with two tokens on each line. The first token is the name
820 to map, and the second token is the actual name to use. */
824 struct file_name_map
*map_next
;
829 #define FILE_NAME_MAP_FILE "header.gcc"
831 /* Read a space delimited string of unlimited length from a stdio
835 read_filename_string (ch
, f
)
843 set
= alloc
= xmalloc (len
+ 1);
847 while ((ch
= getc (f
)) != EOF
&& ! is_space(ch
))
849 if (set
- alloc
== len
)
852 alloc
= xrealloc (alloc
, len
+ 1);
853 set
= alloc
+ len
/ 2;
863 /* This structure holds a linked list of file name maps, one per directory. */
865 struct file_name_map_list
867 struct file_name_map_list
*map_list_next
;
869 struct file_name_map
*map_list_map
;
872 /* Read the file name map file for DIRNAME. */
874 static struct file_name_map
*
875 read_name_map (pfile
, dirname
)
879 register struct file_name_map_list
*map_list_ptr
;
883 /* Check the cache of directories, and mappings in their remap file. */
884 for (map_list_ptr
= CPP_OPTION (pfile
, map_list
); map_list_ptr
;
885 map_list_ptr
= map_list_ptr
->map_list_next
)
886 if (! strcmp (map_list_ptr
->map_list_name
, dirname
))
887 return map_list_ptr
->map_list_map
;
889 map_list_ptr
= ((struct file_name_map_list
*)
890 xmalloc (sizeof (struct file_name_map_list
)));
891 map_list_ptr
->map_list_name
= xstrdup (dirname
);
893 /* The end of the list ends in NULL. */
894 map_list_ptr
->map_list_map
= NULL
;
896 name
= (char *) alloca (strlen (dirname
) + strlen (FILE_NAME_MAP_FILE
) + 2);
897 strcpy (name
, dirname
);
900 strcat (name
, FILE_NAME_MAP_FILE
);
901 f
= fopen (name
, "r");
903 /* Silently return NULL if we cannot open. */
907 int dirlen
= strlen (dirname
);
909 while ((ch
= getc (f
)) != EOF
)
912 struct file_name_map
*ptr
;
916 from
= read_filename_string (ch
, f
);
917 while ((ch
= getc (f
)) != EOF
&& is_hspace(ch
))
919 to
= read_filename_string (ch
, f
);
921 ptr
= ((struct file_name_map
*)
922 xmalloc (sizeof (struct file_name_map
)));
923 ptr
->map_from
= from
;
925 /* Make the real filename absolute. */
926 if (IS_ABSOLUTE_PATHNAME (to
))
930 ptr
->map_to
= xmalloc (dirlen
+ strlen (to
) + 2);
931 strcpy (ptr
->map_to
, dirname
);
932 ptr
->map_to
[dirlen
] = '/';
933 strcpy (ptr
->map_to
+ dirlen
+ 1, to
);
937 ptr
->map_next
= map_list_ptr
->map_list_map
;
938 map_list_ptr
->map_list_map
= ptr
;
940 while ((ch
= getc (f
)) != '\n')
947 /* Add this information to the cache. */
948 map_list_ptr
->map_list_next
= CPP_OPTION (pfile
, map_list
);
949 CPP_OPTION (pfile
, map_list
) = map_list_ptr
;
951 return map_list_ptr
->map_list_map
;
954 /* Remap an unsimplified path NAME based on the file_name_map (if any)
957 remap_filename (pfile
, name
, loc
)
960 struct search_path
*loc
;
962 struct file_name_map
*map
;
963 const char *from
, *p
;
968 /* Get a null-terminated path. */
969 char *dname
= alloca (loc
->len
+ 1);
970 memcpy (dname
, loc
->name
, loc
->len
);
971 dname
[loc
->len
] = '\0';
973 loc
->name_map
= read_name_map (pfile
, dname
);
978 /* This works since NAME has not been simplified yet. */
979 from
= name
+ loc
->len
+ 1;
981 for (map
= loc
->name_map
; map
; map
= map
->map_next
)
982 if (!strcmp (map
->map_from
, from
))
985 /* Try to find a mapping file for the particular directory we are
986 looking in. Thus #include <sys/types.h> will look up sys/types.h
987 in /usr/include/header.gcc and look up types.h in
988 /usr/include/sys/header.gcc. */
989 p
= strrchr (name
, '/');
993 /* We know p != name as absolute paths don't call remap_filename. */
995 cpp_ice (pfile
, "absolute file name in remap_filename");
997 dir
= (char *) alloca (p
- name
+ 1);
998 memcpy (dir
, name
, p
- name
);
999 dir
[p
- name
] = '\0';
1002 for (map
= read_name_map (pfile
, dir
); map
; map
= map
->map_next
)
1003 if (! strcmp (map
->map_from
, from
))
1009 /* Simplify a path name in place, deleting redundant components. This
1010 reduces OS overhead and guarantees that equivalent paths compare
1011 the same (modulo symlinks).
1014 foo/bar/../quux foo/quux
1018 //quux //quux (POSIX allows leading // as a namespace escape)
1020 Guarantees no trailing slashes. All transforms reduce the length
1021 of the string. Returns PATH;
1024 _cpp_simplify_pathname (path
)
1031 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
1032 /* Convert all backslashes to slashes. */
1033 for (from
= path
; *from
; from
++)
1034 if (*from
== '\\') *from
= '/';
1036 /* Skip over leading drive letter if present. */
1037 if (ISALPHA (path
[0]) && path
[1] == ':')
1038 from
= to
= &path
[2];
1045 /* Remove redundant initial /s. */
1054 /* 3 or more initial /s are equivalent to 1 /. */
1055 while (*++from
== '/');
1057 /* On some hosts // differs from /; Posix allows this. */
1065 while (*from
== '/')
1068 if (from
[0] == '.' && from
[1] == '/')
1070 else if (from
[0] == '.' && from
[1] == '\0')
1072 else if (from
[0] == '.' && from
[1] == '.' && from
[2] == '/')
1089 while (to
> base
&& *to
!= '/') to
--;
1095 else if (from
[0] == '.' && from
[1] == '.' && from
[2] == '\0')
1108 while (to
> base
&& *to
!= '/') to
--;
1115 /* Copy this component and trailing /, if any. */
1116 while ((*to
++ = *from
++) != '/')
1128 /* Trim trailing slash */
1129 if (to
[0] == '/' && (!absolute
|| to
> path
+1))
1132 /* Change the empty string to "." so that stat() on the result
1133 will always work. */