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Commit | Line | Data |
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add7091b | 1 | /* Part of CPP library. (include file handling) |
5e7b4e25 | 2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998, |
d6d52dd6 | 3 | 1999, 2000, 2001 Free Software Foundation, Inc. |
add7091b ZW |
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 | |
8 | ||
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 | |
12 | later version. | |
13 | ||
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. | |
18 | ||
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 | |
e38992e8 | 21 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
add7091b ZW |
22 | |
23 | #include "config.h" | |
24 | #include "system.h" | |
add7091b | 25 | #include "cpplib.h" |
88ae23e7 | 26 | #include "cpphash.h" |
c1212d2f | 27 | #include "intl.h" |
168d3732 | 28 | #include "mkdeps.h" |
c31a6508 | 29 | #include "splay-tree.h" |
add7091b | 30 | |
f8f769ea ZW |
31 | #ifdef HAVE_MMAP_FILE |
32 | # include <sys/mman.h> | |
33 | # ifndef MMAP_THRESHOLD | |
34 | # define MMAP_THRESHOLD 3 /* Minimum page count to mmap the file. */ | |
35 | # endif | |
36 | ||
37 | #else /* No MMAP_FILE */ | |
38 | # undef MMAP_THRESHOLD | |
39 | # define MMAP_THRESHOLD 0 | |
40 | #endif | |
41 | ||
d7a2e0f7 ZW |
42 | #ifndef O_BINARY |
43 | # define O_BINARY 0 | |
44 | #endif | |
45 | ||
a58d32c2 ZW |
46 | /* If errno is inspected immediately after a system call fails, it will be |
47 | nonzero, and no error number will ever be zero. */ | |
48 | #ifndef ENOENT | |
49 | # define ENOENT 0 | |
50 | #endif | |
51 | #ifndef ENOTDIR | |
52 | # define ENOTDIR 0 | |
53 | #endif | |
a58d32c2 | 54 | |
f9a0e96c ZW |
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. */ | |
57 | #undef strcmp | |
58 | ||
642ce434 NB |
59 | /* This structure is used for the table of all includes. */ |
60 | struct include_file | |
61 | { | |
62 | const char *name; /* actual path name of file */ | |
63 | const cpp_hashnode *cmacro; /* macro, if any, preventing reinclusion. */ | |
591e15a1 | 64 | const struct search_path *foundhere; |
642ce434 NB |
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) */ | |
f277b5e0 | 70 | int err_no; /* errno obtained if opening a file failed */ |
642ce434 NB |
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 */ | |
642ce434 NB |
74 | }; |
75 | ||
ae1139f9 DR |
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. */ | |
78 | #ifdef VMS | |
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) | |
81 | #else | |
82 | # define STAT_SIZE_TOO_BIG(ST) 0 | |
83 | #endif | |
84 | ||
28e0f040 NB |
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 | |
ba133c96 | 88 | to be included again if the macro is defined. */ |
28e0f040 NB |
89 | #define NEVER_REREAD ((const cpp_hashnode *)-1) |
90 | #define DO_NOT_REREAD(inc) \ | |
91 | ((inc)->cmacro && ((inc)->cmacro == NEVER_REREAD \ | |
ba133c96 | 92 | || (inc)->cmacro->type == NT_MACRO)) |
41947a54 | 93 | #define NO_INCLUDE_PATH ((struct include_file *) -1) |
28e0f040 | 94 | |
a73ac7a5 | 95 | static struct file_name_map *read_name_map |
38b24ee2 ZW |
96 | PARAMS ((cpp_reader *, const char *)); |
97 | static char *read_filename_string PARAMS ((int, FILE *)); | |
98 | static char *remap_filename PARAMS ((cpp_reader *, char *, | |
591e15a1 NB |
99 | struct search_path *)); |
100 | static struct search_path *search_from PARAMS ((cpp_reader *, | |
ba133c96 | 101 | enum include_type)); |
41947a54 | 102 | static struct include_file * |
ba133c96 NB |
103 | find_include_file PARAMS ((cpp_reader *, const cpp_token *, |
104 | enum include_type)); | |
2047e26f | 105 | static struct include_file *open_file PARAMS ((cpp_reader *, const char *)); |
7c092714 | 106 | static int read_include_file PARAMS ((cpp_reader *, struct include_file *)); |
e5eba70a | 107 | static bool stack_include_file PARAMS ((cpp_reader *, struct include_file *)); |
a58d32c2 | 108 | static void purge_cache PARAMS ((struct include_file *)); |
a36c54fa | 109 | static void destroy_node PARAMS ((splay_tree_value)); |
c71f835b | 110 | static int report_missing_guard PARAMS ((splay_tree_node, void *)); |
a36c54fa NB |
111 | static splay_tree_node find_or_create_entry PARAMS ((cpp_reader *, |
112 | const char *)); | |
113 | static void handle_missing_header PARAMS ((cpp_reader *, const char *, int)); | |
f9200da2 | 114 | static int remove_component_p PARAMS ((const char *)); |
a36c54fa NB |
115 | |
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. | |
120 | ||
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. | |
125 | ||
126 | A node's value is a pointer to a struct include_file, and is never | |
127 | NULL. */ | |
d35364d1 | 128 | void |
c71f835b | 129 | _cpp_init_includes (pfile) |
d35364d1 ZW |
130 | cpp_reader *pfile; |
131 | { | |
132 | pfile->all_include_files | |
c31a6508 ZW |
133 | = splay_tree_new ((splay_tree_compare_fn) strcmp, |
134 | (splay_tree_delete_key_fn) free, | |
a36c54fa | 135 | destroy_node); |
0b3d776a | 136 | } |
add7091b | 137 | |
a36c54fa | 138 | /* Tear down the splay tree. */ |
c71f835b ZW |
139 | void |
140 | _cpp_cleanup_includes (pfile) | |
141 | cpp_reader *pfile; | |
142 | { | |
143 | splay_tree_delete (pfile->all_include_files); | |
144 | } | |
145 | ||
a36c54fa NB |
146 | /* Free a node. The path string is automatically freed. */ |
147 | static void | |
148 | destroy_node (v) | |
149 | splay_tree_value v; | |
150 | { | |
151 | struct include_file *f = (struct include_file *)v; | |
152 | ||
153 | if (f) | |
154 | { | |
155 | purge_cache (f); | |
156 | free (f); | |
157 | } | |
158 | } | |
159 | ||
642ce434 NB |
160 | /* Mark a file to not be reread (e.g. #import, read failure). */ |
161 | void | |
162 | _cpp_never_reread (file) | |
163 | struct include_file *file; | |
164 | { | |
165 | file->cmacro = NEVER_REREAD; | |
166 | } | |
167 | ||
ba133c96 | 168 | /* Lookup a filename, which is simplified after making a copy, and |
f9200da2 NB |
169 | create an entry if none exists. errno is nonzero iff a (reported) |
170 | stat() error occurred during simplification. */ | |
a36c54fa NB |
171 | static splay_tree_node |
172 | find_or_create_entry (pfile, fname) | |
d6d52dd6 NB |
173 | cpp_reader *pfile; |
174 | const char *fname; | |
175 | { | |
a36c54fa NB |
176 | splay_tree_node node; |
177 | struct include_file *file; | |
ba133c96 | 178 | char *name = xstrdup (fname); |
d6d52dd6 | 179 | |
ba133c96 NB |
180 | _cpp_simplify_pathname (name); |
181 | node = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) name); | |
182 | if (node) | |
183 | free (name); | |
184 | else | |
d6d52dd6 | 185 | { |
a36c54fa | 186 | file = xcnew (struct include_file); |
ba133c96 | 187 | file->name = name; |
f277b5e0 | 188 | file->err_no = errno; |
a36c54fa NB |
189 | node = splay_tree_insert (pfile->all_include_files, |
190 | (splay_tree_key) file->name, | |
191 | (splay_tree_value) file); | |
d6d52dd6 | 192 | } |
a36c54fa NB |
193 | |
194 | return node; | |
195 | } | |
196 | ||
ba133c96 | 197 | /* Enter a file name in the splay tree, for the sake of cpp_included. */ |
a36c54fa NB |
198 | void |
199 | _cpp_fake_include (pfile, fname) | |
200 | cpp_reader *pfile; | |
201 | const char *fname; | |
202 | { | |
203 | find_or_create_entry (pfile, fname); | |
d6d52dd6 NB |
204 | } |
205 | ||
a58d32c2 | 206 | /* Given a file name, look it up in the cache; if there is no entry, |
2047e26f NB |
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 | |
373e2177 NB |
210 | future. If the file isn't open, open it. The empty string is |
211 | interpreted as stdin. | |
2047e26f NB |
212 | |
213 | Returns an include_file structure with an open file descriptor on | |
214 | success, or NULL on failure. */ | |
add7091b | 215 | |
c31a6508 | 216 | static struct include_file * |
2047e26f | 217 | open_file (pfile, filename) |
c31a6508 ZW |
218 | cpp_reader *pfile; |
219 | const char *filename; | |
2047e26f | 220 | { |
a36c54fa NB |
221 | splay_tree_node nd = find_or_create_entry (pfile, filename); |
222 | struct include_file *file = (struct include_file *) nd->value; | |
add7091b | 223 | |
f277b5e0 NB |
224 | if (file->err_no) |
225 | { | |
226 | /* Ugh. handle_missing_header () needs errno to be set. */ | |
227 | errno = file->err_no; | |
228 | return 0; | |
229 | } | |
2047e26f | 230 | |
ec5c56db | 231 | /* Don't reopen an idempotent file. */ |
a36c54fa NB |
232 | if (DO_NOT_REREAD (file)) |
233 | return file; | |
def3263a | 234 | |
ec5c56db | 235 | /* Don't reopen one which is already loaded. */ |
a36c54fa NB |
236 | if (file->buffer != NULL) |
237 | return file; | |
add7091b | 238 | |
c31a6508 ZW |
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). | |
add7091b | 243 | |
c31a6508 ZW |
244 | Use the three-argument form of open even though we aren't |
245 | specifying O_CREAT, to defend against broken system headers. | |
add7091b | 246 | |
c31a6508 ZW |
247 | O_BINARY tells some runtime libraries (notably DJGPP) not to do |
248 | newline translation; we can handle DOS line breaks just fine | |
249 | ourselves. | |
b0699dad | 250 | |
c31a6508 | 251 | Special case: the empty string is translated to stdin. */ |
d4506961 | 252 | |
c31a6508 | 253 | if (filename[0] == '\0') |
2047e26f | 254 | file->fd = 0; |
f2d5f0cc | 255 | else |
ba133c96 | 256 | file->fd = open (file->name, O_RDONLY | O_NOCTTY | O_BINARY, 0666); |
a58d32c2 | 257 | |
2047e26f NB |
258 | if (file->fd != -1 && fstat (file->fd, &file->st) == 0) |
259 | { | |
c0bfe993 NB |
260 | if (!S_ISDIR (file->st.st_mode)) |
261 | return file; | |
7c092714 NB |
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 | |
264 | search path. */ | |
c0bfe993 | 265 | errno = ENOENT; |
2047e26f | 266 | } |
a58d32c2 | 267 | |
f277b5e0 | 268 | file->err_no = errno; |
a58d32c2 ZW |
269 | return 0; |
270 | } | |
271 | ||
e5eba70a NB |
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 | |
275 | is stacked. */ | |
a58d32c2 | 276 | |
e5eba70a | 277 | static bool |
a58d32c2 ZW |
278 | stack_include_file (pfile, inc) |
279 | cpp_reader *pfile; | |
280 | struct include_file *inc; | |
281 | { | |
282 | cpp_buffer *fp; | |
e5eba70a | 283 | int sysp; |
bb74c963 | 284 | const char *filename; |
51d0f328 | 285 | |
e5eba70a NB |
286 | if (DO_NOT_REREAD (inc)) |
287 | return false; | |
288 | ||
47d89cf3 | 289 | sysp = MAX ((pfile->map ? pfile->map->sysp : 0), |
11bca309 | 290 | (inc->foundhere ? inc->foundhere->sysp : 0)); |
51d0f328 NB |
291 | |
292 | /* For -M, add the file to the dependencies on its first inclusion. */ | |
e5eba70a | 293 | if (CPP_OPTION (pfile, print_deps) > sysp && !inc->include_count) |
51d0f328 NB |
294 | deps_add_dep (pfile->deps, inc->name); |
295 | ||
7c092714 | 296 | /* Not in cache? */ |
e5eba70a | 297 | if (! inc->buffer) |
7c092714 | 298 | { |
4d6baafa | 299 | if (read_include_file (pfile, inc)) |
e5eba70a | 300 | { |
c0bfe993 | 301 | /* If an error occurs, do not try to read this file again. */ |
e5eba70a NB |
302 | _cpp_never_reread (inc); |
303 | return false; | |
304 | } | |
4d6baafa NB |
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); | |
7c092714 NB |
310 | close (inc->fd); |
311 | inc->fd = -1; | |
312 | } | |
313 | ||
e5eba70a | 314 | if (pfile->buffer) |
5993019d NB |
315 | /* We don't want MI guard advice for the main file. */ |
316 | inc->include_count++; | |
eb1f4d9d NB |
317 | |
318 | /* Push a buffer. */ | |
29401c30 NB |
319 | fp = cpp_push_buffer (pfile, inc->buffer, inc->st.st_size, |
320 | /* from_stage3 */ CPP_OPTION (pfile, preprocessed), 0); | |
eb1f4d9d | 321 | fp->inc = inc; |
3cf3593f | 322 | fp->inc->refcnt++; |
a58d32c2 | 323 | |
3cf3593f | 324 | /* Initialise controlling macro state. */ |
6d18adbc | 325 | pfile->mi_valid = true; |
3cf3593f | 326 | pfile->mi_cmacro = 0; |
eb1f4d9d NB |
327 | |
328 | /* Generate the call back. */ | |
bb74c963 NB |
329 | filename = inc->name; |
330 | if (*filename == '\0') | |
331 | filename = _("<stdin>"); | |
332 | _cpp_do_file_change (pfile, LC_ENTER, filename, 1, sysp); | |
e5eba70a NB |
333 | |
334 | return true; | |
a58d32c2 ZW |
335 | } |
336 | ||
337 | /* Read the file referenced by INC into the file cache. | |
338 | ||
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 | |
7c092714 | 342 | block device, we don't want to read it at all. |
a58d32c2 ZW |
343 | |
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 | |
7c092714 NB |
347 | even try to figure out what something is, except for plain files |
348 | and block devices. | |
a58d32c2 ZW |
349 | |
350 | FIXME: Flush file cache and try again if we run out of memory. */ | |
351 | ||
7c092714 | 352 | static int |
a58d32c2 ZW |
353 | read_include_file (pfile, inc) |
354 | cpp_reader *pfile; | |
355 | struct include_file *inc; | |
356 | { | |
357 | ssize_t size, offset, count; | |
358 | U_CHAR *buf; | |
359 | #if MMAP_THRESHOLD | |
360 | static int pagesize = -1; | |
361 | #endif | |
362 | ||
363 | if (S_ISREG (inc->st.st_mode)) | |
f2d5f0cc | 364 | { |
a58d32c2 ZW |
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 | |
372 | does not bite us. */ | |
373 | if (inc->st.st_size > INTTYPE_MAXIMUM (ssize_t)) | |
f2d5f0cc | 374 | { |
a58d32c2 ZW |
375 | cpp_error (pfile, "%s is too large", inc->name); |
376 | goto fail; | |
f2d5f0cc | 377 | } |
a58d32c2 ZW |
378 | size = inc->st.st_size; |
379 | ||
ae0f4dee | 380 | inc->mapped = 0; |
a58d32c2 ZW |
381 | #if MMAP_THRESHOLD |
382 | if (pagesize == -1) | |
383 | pagesize = getpagesize (); | |
384 | ||
07e96fc6 ZW |
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. */ | |
4d6baafa NB |
390 | if (size / pagesize >= MMAP_THRESHOLD |
391 | && (size % pagesize) != 0) | |
a58d32c2 ZW |
392 | { |
393 | buf = (U_CHAR *) mmap (0, size, PROT_READ, MAP_PRIVATE, inc->fd, 0); | |
394 | if (buf == (U_CHAR *)-1) | |
395 | goto perror_fail; | |
396 | inc->mapped = 1; | |
397 | } | |
398 | else | |
c31a6508 | 399 | #endif |
d4506961 | 400 | { |
4d6baafa | 401 | buf = (U_CHAR *) xmalloc (size + 1); |
a58d32c2 ZW |
402 | offset = 0; |
403 | while (offset < size) | |
404 | { | |
405 | count = read (inc->fd, buf + offset, size - offset); | |
406 | if (count < 0) | |
407 | goto perror_fail; | |
408 | if (count == 0) | |
409 | { | |
ae1139f9 DR |
410 | if (!STAT_SIZE_TOO_BIG (inc->st)) |
411 | cpp_warning | |
412 | (pfile, "%s is shorter than expected", inc->name); | |
413 | buf = xrealloc (buf, offset); | |
414 | inc->st.st_size = offset; | |
a58d32c2 ZW |
415 | break; |
416 | } | |
417 | offset += count; | |
418 | } | |
4d6baafa NB |
419 | /* The lexer requires that the buffer be NUL-terminated. */ |
420 | buf[size] = '\0'; | |
d4506961 | 421 | } |
a58d32c2 ZW |
422 | } |
423 | else if (S_ISBLK (inc->st.st_mode)) | |
424 | { | |
425 | cpp_error (pfile, "%s is a block device", inc->name); | |
426 | goto fail; | |
427 | } | |
a58d32c2 ZW |
428 | else |
429 | { | |
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. */ | |
433 | size = 8 * 1024; | |
d4506961 | 434 | |
4d6baafa | 435 | buf = (U_CHAR *) xmalloc (size + 1); |
a58d32c2 ZW |
436 | offset = 0; |
437 | while ((count = read (inc->fd, buf + offset, size - offset)) > 0) | |
f2d5f0cc | 438 | { |
a58d32c2 ZW |
439 | offset += count; |
440 | if (offset == size) | |
4d6baafa NB |
441 | { |
442 | size *= 2; | |
443 | buf = xrealloc (buf, size + 1); | |
444 | } | |
f2d5f0cc | 445 | } |
a58d32c2 ZW |
446 | if (count < 0) |
447 | goto perror_fail; | |
448 | ||
4d6baafa NB |
449 | if (offset + 1 < size) |
450 | buf = xrealloc (buf, offset + 1); | |
451 | ||
452 | /* The lexer requires that the buffer be NUL-terminated. */ | |
453 | buf[offset] = '\0'; | |
a58d32c2 | 454 | inc->st.st_size = offset; |
f2d5f0cc | 455 | } |
d7a2e0f7 | 456 | |
a58d32c2 | 457 | inc->buffer = buf; |
7c092714 | 458 | return 0; |
a58d32c2 ZW |
459 | |
460 | perror_fail: | |
461 | cpp_error_from_errno (pfile, inc->name); | |
462 | fail: | |
7c092714 | 463 | return 1; |
a58d32c2 ZW |
464 | } |
465 | ||
466 | static void | |
467 | purge_cache (inc) | |
468 | struct include_file *inc; | |
469 | { | |
470 | if (inc->buffer) | |
c31a6508 | 471 | { |
ae0f4dee | 472 | #if MMAP_THRESHOLD |
a58d32c2 | 473 | if (inc->mapped) |
6f84c9bd | 474 | munmap ((PTR) inc->buffer, inc->st.st_size); |
a58d32c2 | 475 | else |
ae0f4dee | 476 | #endif |
a58d32c2 ZW |
477 | free ((PTR) inc->buffer); |
478 | inc->buffer = NULL; | |
c31a6508 | 479 | } |
e576beb0 ZW |
480 | } |
481 | ||
c31a6508 ZW |
482 | /* Return 1 if the file named by FNAME has been included before in |
483 | any context, 0 otherwise. */ | |
484 | int | |
485 | cpp_included (pfile, fname) | |
add7091b | 486 | cpp_reader *pfile; |
bcc5cac9 | 487 | const char *fname; |
add7091b | 488 | { |
591e15a1 | 489 | struct search_path *path; |
e7182666 | 490 | char *name, *n; |
c31a6508 | 491 | splay_tree_node nd; |
0b3d776a | 492 | |
05e81724 | 493 | if (IS_ABSOLUTE_PATHNAME (fname)) |
0b3d776a | 494 | { |
c31a6508 ZW |
495 | /* Just look it up. */ |
496 | nd = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) fname); | |
497 | return (nd && nd->value); | |
0b3d776a | 498 | } |
c31a6508 ZW |
499 | |
500 | /* Search directory path for the file. */ | |
b6464a73 | 501 | name = (char *) alloca (strlen (fname) + pfile->max_include_len + 2); |
c31a6508 | 502 | for (path = CPP_OPTION (pfile, quote_include); path; path = path->next) |
0b3d776a | 503 | { |
591e15a1 NB |
504 | memcpy (name, path->name, path->len); |
505 | name[path->len] = '/'; | |
506 | strcpy (&name[path->len + 1], fname); | |
c31a6508 | 507 | if (CPP_OPTION (pfile, remap)) |
e7182666 NB |
508 | n = remap_filename (pfile, name, path); |
509 | else | |
ba133c96 | 510 | n = name; |
c31a6508 | 511 | |
e7182666 | 512 | nd = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) n); |
c31a6508 ZW |
513 | if (nd && nd->value) |
514 | return 1; | |
0b3d776a | 515 | } |
c31a6508 | 516 | return 0; |
add7091b ZW |
517 | } |
518 | ||
41947a54 NB |
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. */ | |
c31a6508 ZW |
524 | |
525 | static struct include_file * | |
ba133c96 | 526 | find_include_file (pfile, header, type) |
f2d5f0cc | 527 | cpp_reader *pfile; |
41947a54 | 528 | const cpp_token *header; |
ba133c96 | 529 | enum include_type type; |
f2d5f0cc | 530 | { |
41947a54 | 531 | const char *fname = (const char *) header->val.str.text; |
591e15a1 | 532 | struct search_path *path; |
c31a6508 | 533 | struct include_file *file; |
e7182666 | 534 | char *name, *n; |
add7091b | 535 | |
05e81724 | 536 | if (IS_ABSOLUTE_PATHNAME (fname)) |
2047e26f | 537 | return open_file (pfile, fname); |
41947a54 NB |
538 | |
539 | /* For #include_next, skip in the search path past the dir in which | |
e7182666 NB |
540 | the current file was found, but if it was found via an absolute |
541 | path use the normal search logic. */ | |
ba133c96 | 542 | if (type == IT_INCLUDE_NEXT && pfile->buffer->inc->foundhere) |
41947a54 NB |
543 | path = pfile->buffer->inc->foundhere->next; |
544 | else if (header->type == CPP_HEADER_NAME) | |
545 | path = CPP_OPTION (pfile, bracket_include); | |
546 | else | |
ba133c96 | 547 | path = search_from (pfile, type); |
41947a54 NB |
548 | |
549 | if (path == NULL) | |
550 | { | |
1f978f5f | 551 | cpp_error (pfile, "no include path in which to find %s", fname); |
41947a54 NB |
552 | return NO_INCLUDE_PATH; |
553 | } | |
554 | ||
c31a6508 | 555 | /* Search directory path for the file. */ |
b6464a73 | 556 | name = (char *) alloca (strlen (fname) + pfile->max_include_len + 2); |
41947a54 | 557 | for (; path; path = path->next) |
add7091b | 558 | { |
591e15a1 NB |
559 | memcpy (name, path->name, path->len); |
560 | name[path->len] = '/'; | |
561 | strcpy (&name[path->len + 1], fname); | |
c31a6508 | 562 | if (CPP_OPTION (pfile, remap)) |
e7182666 NB |
563 | n = remap_filename (pfile, name, path); |
564 | else | |
ba133c96 | 565 | n = name; |
c31a6508 | 566 | |
e7182666 | 567 | file = open_file (pfile, n); |
c31a6508 | 568 | if (file) |
add7091b | 569 | { |
c31a6508 ZW |
570 | file->foundhere = path; |
571 | return file; | |
add7091b ZW |
572 | } |
573 | } | |
591e15a1 | 574 | |
c31a6508 | 575 | return 0; |
add7091b ZW |
576 | } |
577 | ||
e605b040 | 578 | /* Not everyone who wants to set system-header-ness on a buffer can |
642ce434 NB |
579 | see the details of a buffer. This is an exported interface because |
580 | fix-header needs it. */ | |
e605b040 | 581 | void |
614c7d37 | 582 | cpp_make_system_header (pfile, syshdr, externc) |
e605b040 | 583 | cpp_reader *pfile; |
614c7d37 | 584 | int syshdr, externc; |
e605b040 | 585 | { |
614c7d37 NB |
586 | int flags = 0; |
587 | ||
588 | /* 1 = system header, 2 = system header to be treated as C. */ | |
589 | if (syshdr) | |
590 | flags = 1 + (externc != 0); | |
47d89cf3 NB |
591 | _cpp_do_file_change (pfile, LC_RENAME, pfile->map->to_file, |
592 | SOURCE_LINE (pfile->map, pfile->line), flags); | |
e605b040 ZW |
593 | } |
594 | ||
c71f835b ZW |
595 | /* Report on all files that might benefit from a multiple include guard. |
596 | Triggered by -H. */ | |
597 | void | |
598 | _cpp_report_missing_guards (pfile) | |
599 | cpp_reader *pfile; | |
600 | { | |
601 | int banner = 0; | |
602 | splay_tree_foreach (pfile->all_include_files, report_missing_guard, | |
603 | (PTR) &banner); | |
604 | } | |
605 | ||
606 | static int | |
607 | report_missing_guard (n, b) | |
608 | splay_tree_node n; | |
609 | void *b; | |
610 | { | |
611 | struct include_file *f = (struct include_file *) n->value; | |
612 | int *bannerp = (int *)b; | |
613 | ||
614 | if (f && f->cmacro == 0 && f->include_count == 1) | |
615 | { | |
616 | if (*bannerp == 0) | |
617 | { | |
618 | fputs (_("Multiple include guards may be useful for:\n"), stderr); | |
619 | *bannerp = 1; | |
620 | } | |
621 | fputs (f->name, stderr); | |
622 | putc ('\n', stderr); | |
623 | } | |
624 | return 0; | |
625 | } | |
626 | ||
6d2f8887 | 627 | /* Create a dependency, or issue an error message as appropriate. */ |
a36c54fa NB |
628 | static void |
629 | handle_missing_header (pfile, fname, angle_brackets) | |
630 | cpp_reader *pfile; | |
631 | const char *fname; | |
632 | int angle_brackets; | |
633 | { | |
d8693c6f | 634 | int print_dep = CPP_PRINT_DEPS(pfile) > (angle_brackets || pfile->map->sysp); |
7c092714 | 635 | |
a36c54fa NB |
636 | if (CPP_OPTION (pfile, print_deps_missing_files) && print_dep) |
637 | { | |
638 | if (!angle_brackets || IS_ABSOLUTE_PATHNAME (fname)) | |
639 | deps_add_dep (pfile->deps, fname); | |
640 | else | |
641 | { | |
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); | |
645 | char *p; | |
646 | int len = 0, fname_len = strlen (fname); | |
647 | ||
648 | if (ptr) | |
649 | len = ptr->len; | |
650 | ||
651 | p = (char *) alloca (len + fname_len + 2); | |
652 | if (len) | |
653 | { | |
654 | memcpy (p, ptr->name, len); | |
655 | p[len++] = '/'; | |
656 | } | |
657 | memcpy (p + len, fname, fname_len + 1); | |
a36c54fa NB |
658 | deps_add_dep (pfile->deps, p); |
659 | } | |
660 | } | |
e7182666 NB |
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 | |
a1f300c0 | 665 | file exists in. FIXME: Use a future cpp_diagnostic_with_errno () |
e7182666 | 666 | for both of these cases. */ |
a36c54fa | 667 | else if (CPP_PRINT_DEPS (pfile) && ! print_dep) |
e7182666 | 668 | cpp_warning (pfile, "%s: %s", fname, xstrerror (errno)); |
a36c54fa NB |
669 | else |
670 | cpp_error_from_errno (pfile, fname); | |
671 | } | |
672 | ||
e5eba70a NB |
673 | /* Handles #include-family directives, and the command line -imacros |
674 | and -include. Returns true if a buffer was stacked. */ | |
675 | bool | |
ba133c96 | 676 | _cpp_execute_include (pfile, header, type) |
168d3732 | 677 | cpp_reader *pfile; |
93c80368 | 678 | const cpp_token *header; |
ba133c96 | 679 | enum include_type type; |
168d3732 | 680 | { |
e5eba70a | 681 | bool stacked = false; |
ba133c96 | 682 | struct include_file *inc = find_include_file (pfile, header, type); |
642ce434 | 683 | |
41947a54 NB |
684 | if (inc == 0) |
685 | handle_missing_header (pfile, (const char *) header->val.str.text, | |
686 | header->type == CPP_HEADER_NAME); | |
687 | else if (inc != NO_INCLUDE_PATH) | |
168d3732 | 688 | { |
e5eba70a | 689 | stacked = stack_include_file (pfile, inc); |
51d0f328 | 690 | |
ba133c96 | 691 | if (type == IT_IMPORT) |
e7182666 | 692 | _cpp_never_reread (inc); |
168d3732 | 693 | } |
ba133c96 | 694 | |
e5eba70a | 695 | return stacked; |
168d3732 ZW |
696 | } |
697 | ||
41947a54 NB |
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. */ | |
f3f751ad | 701 | int |
41947a54 | 702 | _cpp_compare_file_date (pfile, header) |
f3f751ad | 703 | cpp_reader *pfile; |
41947a54 | 704 | const cpp_token *header; |
f3f751ad | 705 | { |
41947a54 | 706 | struct include_file *inc = find_include_file (pfile, header, 0); |
f3f751ad | 707 | |
41947a54 | 708 | if (inc == NULL || inc == NO_INCLUDE_PATH) |
f3f751ad | 709 | return -1; |
41947a54 | 710 | |
a58d32c2 | 711 | if (inc->fd > 0) |
f3f751ad | 712 | { |
f3f751ad NS |
713 | close (inc->fd); |
714 | inc->fd = -1; | |
715 | } | |
a58d32c2 | 716 | |
41947a54 | 717 | return inc->st.st_mtime > pfile->buffer->inc->st.st_mtime; |
f3f751ad NS |
718 | } |
719 | ||
720 | ||
e5eba70a NB |
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 | |
723 | stacked. */ | |
724 | bool | |
614c7d37 | 725 | _cpp_read_file (pfile, fname) |
c45da1ca ZW |
726 | cpp_reader *pfile; |
727 | const char *fname; | |
728 | { | |
373e2177 | 729 | struct include_file *f = open_file (pfile, fname); |
c45da1ca | 730 | |
041c3194 | 731 | if (f == NULL) |
c0bfe993 NB |
732 | { |
733 | cpp_error_from_errno (pfile, fname); | |
734 | return false; | |
735 | } | |
041c3194 | 736 | |
c0bfe993 | 737 | return stack_include_file (pfile, f); |
f8f769ea ZW |
738 | } |
739 | ||
f9a0e96c | 740 | /* Do appropriate cleanup when a file buffer is popped off the input |
29401c30 | 741 | stack. Push the next -include file, if any remain. */ |
f9a0e96c | 742 | void |
29401c30 | 743 | _cpp_pop_file_buffer (pfile, inc) |
f9a0e96c | 744 | cpp_reader *pfile; |
29401c30 | 745 | struct include_file *inc; |
f9a0e96c | 746 | { |
ba133c96 | 747 | /* Record the inclusion-preventing macro, which could be NULL |
6d18adbc NB |
748 | meaning no controlling macro. */ |
749 | if (pfile->mi_valid && inc->cmacro == NULL) | |
ba133c96 | 750 | inc->cmacro = pfile->mi_cmacro; |
93c80368 NB |
751 | |
752 | /* Invalidate control macros in the #including file. */ | |
6d18adbc | 753 | pfile->mi_valid = false; |
f9a0e96c | 754 | |
a58d32c2 ZW |
755 | inc->refcnt--; |
756 | if (inc->refcnt == 0 && DO_NOT_REREAD (inc)) | |
757 | purge_cache (inc); | |
29401c30 NB |
758 | |
759 | /* Don't generate a callback for popping the main file. */ | |
760 | if (pfile->buffer) | |
761 | { | |
762 | _cpp_do_file_change (pfile, LC_LEAVE, 0, 0, 0); | |
763 | ||
764 | /* Finally, push the next -included file, if any. */ | |
765 | if (!pfile->buffer->prev) | |
766 | _cpp_push_next_buffer (pfile); | |
767 | } | |
f9a0e96c ZW |
768 | } |
769 | ||
591e15a1 NB |
770 | /* Returns the first place in the include chain to start searching for |
771 | "" includes. This involves stripping away the basename of the | |
ba133c96 NB |
772 | current file, unless -I- was specified. |
773 | ||
774 | If we're handling -include or -imacros, use the "" chain, but with | |
775 | the preprocessor's cwd prepended. */ | |
591e15a1 | 776 | static struct search_path * |
ba133c96 | 777 | search_from (pfile, type) |
591e15a1 | 778 | cpp_reader *pfile; |
ba133c96 | 779 | enum include_type type; |
591e15a1 NB |
780 | { |
781 | cpp_buffer *buffer = pfile->buffer; | |
782 | unsigned int dlen; | |
783 | ||
ba133c96 NB |
784 | /* Command line uses the cwd, and does not cache the result. */ |
785 | if (type == IT_CMDLINE) | |
786 | goto use_cwd; | |
787 | ||
591e15a1 NB |
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); | |
791 | ||
ba133c96 | 792 | if (! buffer->search_cached) |
591e15a1 | 793 | { |
ba133c96 | 794 | buffer->search_cached = 1; |
591e15a1 | 795 | |
ba133c96 | 796 | dlen = lbasename (buffer->inc->name) - buffer->inc->name; |
591e15a1 | 797 | |
ba133c96 NB |
798 | if (dlen) |
799 | { | |
800 | /* We don't guarantee NAME is null-terminated. This saves | |
29401c30 | 801 | allocating and freeing memory. Drop a trailing '/'. */ |
ba133c96 NB |
802 | buffer->dir.name = buffer->inc->name; |
803 | if (dlen > 1) | |
804 | dlen--; | |
805 | } | |
806 | else | |
807 | { | |
808 | use_cwd: | |
809 | buffer->dir.name = "."; | |
810 | dlen = 1; | |
811 | } | |
812 | ||
813 | if (dlen > pfile->max_include_len) | |
814 | pfile->max_include_len = dlen; | |
815 | ||
816 | buffer->dir.len = dlen; | |
817 | buffer->dir.next = CPP_OPTION (pfile, quote_include); | |
47d89cf3 | 818 | buffer->dir.sysp = pfile->map->sysp; |
ba133c96 | 819 | } |
591e15a1 NB |
820 | |
821 | return &buffer->dir; | |
822 | } | |
823 | ||
c31a6508 ZW |
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. */ | |
831 | ||
832 | struct file_name_map | |
833 | { | |
834 | struct file_name_map *map_next; | |
835 | char *map_from; | |
836 | char *map_to; | |
837 | }; | |
838 | ||
839 | #define FILE_NAME_MAP_FILE "header.gcc" | |
840 | ||
841 | /* Read a space delimited string of unlimited length from a stdio | |
842 | file. */ | |
843 | ||
844 | static char * | |
845 | read_filename_string (ch, f) | |
846 | int ch; | |
847 | FILE *f; | |
848 | { | |
849 | char *alloc, *set; | |
850 | int len; | |
851 | ||
852 | len = 20; | |
853 | set = alloc = xmalloc (len + 1); | |
854 | if (! is_space(ch)) | |
855 | { | |
856 | *set++ = ch; | |
857 | while ((ch = getc (f)) != EOF && ! is_space(ch)) | |
858 | { | |
859 | if (set - alloc == len) | |
860 | { | |
861 | len *= 2; | |
862 | alloc = xrealloc (alloc, len + 1); | |
863 | set = alloc + len / 2; | |
864 | } | |
865 | *set++ = ch; | |
866 | } | |
867 | } | |
868 | *set = '\0'; | |
869 | ungetc (ch, f); | |
870 | return alloc; | |
871 | } | |
872 | ||
873 | /* This structure holds a linked list of file name maps, one per directory. */ | |
874 | ||
875 | struct file_name_map_list | |
876 | { | |
877 | struct file_name_map_list *map_list_next; | |
878 | char *map_list_name; | |
879 | struct file_name_map *map_list_map; | |
880 | }; | |
881 | ||
882 | /* Read the file name map file for DIRNAME. */ | |
883 | ||
884 | static struct file_name_map * | |
885 | read_name_map (pfile, dirname) | |
886 | cpp_reader *pfile; | |
887 | const char *dirname; | |
888 | { | |
b3694847 | 889 | struct file_name_map_list *map_list_ptr; |
c31a6508 ZW |
890 | char *name; |
891 | FILE *f; | |
892 | ||
8767c894 | 893 | /* Check the cache of directories, and mappings in their remap file. */ |
c31a6508 ZW |
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; | |
898 | ||
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); | |
8767c894 NB |
902 | |
903 | /* The end of the list ends in NULL. */ | |
4b588241 | 904 | map_list_ptr->map_list_map = NULL; |
c31a6508 ZW |
905 | |
906 | name = (char *) alloca (strlen (dirname) + strlen (FILE_NAME_MAP_FILE) + 2); | |
907 | strcpy (name, dirname); | |
908 | if (*dirname) | |
909 | strcat (name, "/"); | |
910 | strcat (name, FILE_NAME_MAP_FILE); | |
911 | f = fopen (name, "r"); | |
8767c894 NB |
912 | |
913 | /* Silently return NULL if we cannot open. */ | |
914 | if (f) | |
c31a6508 ZW |
915 | { |
916 | int ch; | |
917 | int dirlen = strlen (dirname); | |
918 | ||
919 | while ((ch = getc (f)) != EOF) | |
920 | { | |
921 | char *from, *to; | |
922 | struct file_name_map *ptr; | |
923 | ||
924 | if (is_space(ch)) | |
925 | continue; | |
926 | from = read_filename_string (ch, f); | |
927 | while ((ch = getc (f)) != EOF && is_hspace(ch)) | |
928 | ; | |
929 | to = read_filename_string (ch, f); | |
930 | ||
931 | ptr = ((struct file_name_map *) | |
932 | xmalloc (sizeof (struct file_name_map))); | |
933 | ptr->map_from = from; | |
934 | ||
935 | /* Make the real filename absolute. */ | |
05e81724 | 936 | if (IS_ABSOLUTE_PATHNAME (to)) |
c31a6508 ZW |
937 | ptr->map_to = to; |
938 | else | |
939 | { | |
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); | |
944 | free (to); | |
945 | } | |
946 | ||
947 | ptr->map_next = map_list_ptr->map_list_map; | |
948 | map_list_ptr->map_list_map = ptr; | |
949 | ||
950 | while ((ch = getc (f)) != '\n') | |
951 | if (ch == EOF) | |
952 | break; | |
953 | } | |
954 | fclose (f); | |
955 | } | |
956 | ||
8767c894 | 957 | /* Add this information to the cache. */ |
c31a6508 ZW |
958 | map_list_ptr->map_list_next = CPP_OPTION (pfile, map_list); |
959 | CPP_OPTION (pfile, map_list) = map_list_ptr; | |
960 | ||
961 | return map_list_ptr->map_list_map; | |
962 | } | |
963 | ||
e7182666 NB |
964 | /* Remap an unsimplified path NAME based on the file_name_map (if any) |
965 | for LOC. */ | |
c31a6508 ZW |
966 | static char * |
967 | remap_filename (pfile, name, loc) | |
968 | cpp_reader *pfile; | |
969 | char *name; | |
591e15a1 | 970 | struct search_path *loc; |
c31a6508 ZW |
971 | { |
972 | struct file_name_map *map; | |
8767c894 | 973 | const char *from, *p; |
e7182666 | 974 | char *dir; |
c31a6508 ZW |
975 | |
976 | if (! loc->name_map) | |
8767c894 | 977 | { |
e7182666 NB |
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'; | |
982 | ||
591e15a1 | 983 | loc->name_map = read_name_map (pfile, dname); |
8767c894 NB |
984 | if (! loc->name_map) |
985 | return name; | |
986 | } | |
c31a6508 | 987 | |
e7182666 | 988 | /* This works since NAME has not been simplified yet. */ |
591e15a1 | 989 | from = name + loc->len + 1; |
c31a6508 ZW |
990 | |
991 | for (map = loc->name_map; map; map = map->map_next) | |
992 | if (!strcmp (map->map_from, from)) | |
993 | return map->map_to; | |
994 | ||
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, '/'); | |
1000 | if (!p) | |
c31a6508 ZW |
1001 | return name; |
1002 | ||
8767c894 | 1003 | /* We know p != name as absolute paths don't call remap_filename. */ |
c31a6508 | 1004 | if (p == name) |
8767c894 NB |
1005 | cpp_ice (pfile, "absolute file name in remap_filename"); |
1006 | ||
1007 | dir = (char *) alloca (p - name + 1); | |
1008 | memcpy (dir, name, p - name); | |
1009 | dir[p - name] = '\0'; | |
1010 | from = p + 1; | |
c31a6508 ZW |
1011 | |
1012 | for (map = read_name_map (pfile, dir); map; map = map->map_next) | |
8767c894 | 1013 | if (! strcmp (map->map_from, from)) |
c31a6508 ZW |
1014 | return map->map_to; |
1015 | ||
1016 | return name; | |
1017 | } | |
1018 | ||
f9200da2 NB |
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 | |
1022 | stat (). */ | |
1023 | static int | |
1024 | remove_component_p (path) | |
1025 | const char *path; | |
1026 | { | |
1027 | struct stat s; | |
1028 | int result; | |
1029 | ||
1030 | #ifdef HAVE_LSTAT | |
1031 | result = lstat (path, &s); | |
1032 | #else | |
1033 | result = stat (path, &s); | |
1034 | #endif | |
1035 | ||
8d75ad04 AO |
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. */ | |
1039 | if (result == 0) | |
1040 | errno = 0; | |
1041 | ||
f9200da2 NB |
1042 | return result == 0 && S_ISDIR (s.st_mode); |
1043 | } | |
1044 | ||
0b3d776a ZW |
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). | |
1048 | ||
1049 | Transforms made: | |
1050 | foo/bar/../quux foo/quux | |
1051 | foo/./bar foo/bar | |
1052 | foo//bar foo/bar | |
1053 | /../quux /quux | |
1054 | //quux //quux (POSIX allows leading // as a namespace escape) | |
1055 | ||
f9200da2 NB |
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 (). */ | |
1059 | ||
e7182666 | 1060 | char * |
b0699dad | 1061 | _cpp_simplify_pathname (path) |
21380ab0 | 1062 | char *path; |
0b3d776a | 1063 | { |
f9200da2 NB |
1064 | #ifndef VMS |
1065 | char *from, *to; | |
1066 | char *base, *orig_base; | |
1067 | int absolute = 0; | |
1068 | ||
1069 | errno = 0; | |
1070 | /* Don't overflow the empty path by putting a '.' in it below. */ | |
1071 | if (*path == '\0') | |
1072 | return path; | |
0b3d776a | 1073 | |
509781a4 | 1074 | #if defined (HAVE_DOS_BASED_FILE_SYSTEM) |
ec5c56db | 1075 | /* Convert all backslashes to slashes. */ |
f9200da2 NB |
1076 | for (from = path; *from; from++) |
1077 | if (*from == '\\') *from = '/'; | |
0b3d776a | 1078 | |
ec5c56db | 1079 | /* Skip over leading drive letter if present. */ |
f9200da2 NB |
1080 | if (ISALPHA (path[0]) && path[1] == ':') |
1081 | from = to = &path[2]; | |
1082 | else | |
0b3d776a | 1083 | from = to = path; |
f9200da2 NB |
1084 | #else |
1085 | from = to = path; | |
0b3d776a ZW |
1086 | #endif |
1087 | ||
f9200da2 NB |
1088 | /* Remove redundant leading /s. */ |
1089 | if (*from == '/') | |
0b3d776a | 1090 | { |
f9200da2 NB |
1091 | absolute = 1; |
1092 | to++; | |
1093 | from++; | |
1094 | if (*from == '/') | |
0b3d776a | 1095 | { |
f9200da2 NB |
1096 | if (*++from == '/') |
1097 | /* 3 or more initial /s are equivalent to 1 /. */ | |
1098 | while (*++from == '/'); | |
1099 | else | |
1100 | /* On some hosts // differs from /; Posix allows this. */ | |
1101 | to++; | |
0b3d776a ZW |
1102 | } |
1103 | } | |
f9200da2 NB |
1104 | |
1105 | base = orig_base = to; | |
1106 | for (;;) | |
0b3d776a | 1107 | { |
f9200da2 NB |
1108 | int move_base = 0; |
1109 | ||
1110 | while (*from == '/') | |
1111 | from++; | |
1112 | ||
1113 | if (*from == '\0') | |
1114 | break; | |
1115 | ||
1116 | if (*from == '.') | |
0b3d776a | 1117 | { |
f9200da2 NB |
1118 | if (from[1] == '\0') |
1119 | break; | |
1120 | if (from[1] == '/') | |
0b3d776a | 1121 | { |
f9200da2 NB |
1122 | from += 2; |
1123 | continue; | |
0b3d776a | 1124 | } |
f9200da2 | 1125 | else if (from[1] == '.' && (from[2] == '/' || from[2] == '\0')) |
0b3d776a | 1126 | { |
f9200da2 NB |
1127 | /* Don't simplify if there was no previous component. */ |
1128 | if (absolute && orig_base == to) | |
0b3d776a | 1129 | { |
f9200da2 NB |
1130 | from += 2; |
1131 | continue; | |
0b3d776a | 1132 | } |
f9200da2 NB |
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) | |
0b3d776a | 1136 | { |
f9200da2 NB |
1137 | /* We don't back up if it's a symlink. */ |
1138 | *to = '\0'; | |
1139 | if (remove_component_p (path)) | |
1140 | { | |
1141 | while (to > base && *to != '/') | |
1142 | to--; | |
1143 | from += 2; | |
1144 | continue; | |
1145 | } | |
0b3d776a | 1146 | } |
f9200da2 | 1147 | move_base = 1; |
0b3d776a | 1148 | } |
f9200da2 NB |
1149 | } |
1150 | ||
1151 | /* Add the component separator. */ | |
1152 | if (to > orig_base) | |
1153 | *to++ = '/'; | |
1154 | ||
1155 | /* Copy this component until the trailing null or '/'. */ | |
1156 | while (*from != '\0' && *from != '/') | |
1157 | *to++ = *from++; | |
1158 | ||
1159 | if (move_base) | |
1160 | base = to; | |
0b3d776a ZW |
1161 | } |
1162 | ||
f9200da2 NB |
1163 | /* Change the empty string to "." so that it is not treated as stdin. |
1164 | Null terminate. */ | |
1165 | if (to == path) | |
1166 | *to++ = '.'; | |
1167 | *to = '\0'; | |
1168 | ||
1169 | return path; | |
1170 | #else /* VMS */ | |
1171 | errno = 0; | |
1172 | return path; | |
1173 | #endif /* !VMS */ | |
0b3d776a | 1174 | } |