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Commit | Line | Data |
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add7091b | 1 | /* Part of CPP library. (include file handling) |
5793b276 NB |
2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998, |
3 | 1999, 2000, 2001, 2002, 2003 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" | |
17211ab5 | 25 | #include <dirent.h> |
4977bab6 ZW |
26 | #include "coretypes.h" |
27 | #include "tm.h" | |
add7091b | 28 | #include "cpplib.h" |
88ae23e7 | 29 | #include "cpphash.h" |
c1212d2f | 30 | #include "intl.h" |
168d3732 | 31 | #include "mkdeps.h" |
c31a6508 | 32 | #include "splay-tree.h" |
f8f769ea | 33 | |
d7a2e0f7 ZW |
34 | #ifndef O_BINARY |
35 | # define O_BINARY 0 | |
36 | #endif | |
37 | ||
a58d32c2 ZW |
38 | /* If errno is inspected immediately after a system call fails, it will be |
39 | nonzero, and no error number will ever be zero. */ | |
40 | #ifndef ENOENT | |
41 | # define ENOENT 0 | |
42 | #endif | |
43 | #ifndef ENOTDIR | |
44 | # define ENOTDIR 0 | |
45 | #endif | |
a58d32c2 | 46 | |
642ce434 | 47 | /* This structure is used for the table of all includes. */ |
dc65cd60 | 48 | struct include_file { |
642ce434 | 49 | const char *name; /* actual path name of file */ |
17211ab5 | 50 | const char *header_name; /* the original header found */ |
642ce434 | 51 | const cpp_hashnode *cmacro; /* macro, if any, preventing reinclusion. */ |
5793b276 | 52 | const struct cpp_path *foundhere; |
642ce434 NB |
53 | /* location in search path where file was |
54 | found, for #include_next and sysp. */ | |
55 | const unsigned char *buffer; /* pointer to cached file contents */ | |
56 | struct stat st; /* copy of stat(2) data for file */ | |
57 | int fd; /* fd open on file (short term storage only) */ | |
f277b5e0 | 58 | int err_no; /* errno obtained if opening a file failed */ |
642ce434 | 59 | unsigned short include_count; /* number of times file has been read */ |
17211ab5 GK |
60 | unsigned char pch; /* 0: file not known to be a PCH. |
61 | 1: file is a PCH | |
62 | (on return from find_include_file). | |
63 | 2: file is not and never will be a valid | |
64 | precompiled header. | |
65 | 3: file is always a valid precompiled | |
66 | header. */ | |
642ce434 NB |
67 | }; |
68 | ||
ae1139f9 | 69 | /* Variable length record files on VMS will have a stat size that includes |
3ef42a0c | 70 | record control characters that won't be included in the read size. */ |
ae1139f9 DR |
71 | #ifdef VMS |
72 | # define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */ | |
73 | # define STAT_SIZE_TOO_BIG(ST) ((ST).st_fab_rfm == FAB_C_VAR) | |
74 | #else | |
75 | # define STAT_SIZE_TOO_BIG(ST) 0 | |
76 | #endif | |
77 | ||
28e0f040 NB |
78 | /* The cmacro works like this: If it's NULL, the file is to be |
79 | included again. If it's NEVER_REREAD, the file is never to be | |
80 | included again. Otherwise it is a macro hashnode, and the file is | |
ba133c96 | 81 | to be included again if the macro is defined. */ |
dc65cd60 | 82 | #define NEVER_REREAD ((const cpp_hashnode *) -1) |
28e0f040 NB |
83 | #define DO_NOT_REREAD(inc) \ |
84 | ((inc)->cmacro && ((inc)->cmacro == NEVER_REREAD \ | |
ba133c96 | 85 | || (inc)->cmacro->type == NT_MACRO)) |
41947a54 | 86 | #define NO_INCLUDE_PATH ((struct include_file *) -1) |
17211ab5 | 87 | #define INCLUDE_PCH_P(F) (((F)->pch & 1) != 0) |
28e0f040 | 88 | |
a73ac7a5 | 89 | static struct file_name_map *read_name_map |
38b24ee2 ZW |
90 | PARAMS ((cpp_reader *, const char *)); |
91 | static char *read_filename_string PARAMS ((int, FILE *)); | |
92 | static char *remap_filename PARAMS ((cpp_reader *, char *, | |
5793b276 NB |
93 | struct cpp_path *)); |
94 | static struct cpp_path *search_from PARAMS ((cpp_reader *, | |
ba133c96 | 95 | enum include_type)); |
41947a54 | 96 | static struct include_file * |
74eb4b3e | 97 | find_include_file PARAMS ((cpp_reader *, const char *, int, |
ba133c96 | 98 | enum include_type)); |
2047e26f | 99 | static struct include_file *open_file PARAMS ((cpp_reader *, const char *)); |
17211ab5 GK |
100 | static struct include_file *validate_pch PARAMS ((cpp_reader *, |
101 | const char *, | |
102 | const char *)); | |
103 | static struct include_file *open_file_pch PARAMS ((cpp_reader *, | |
104 | const char *)); | |
7c092714 | 105 | static int read_include_file PARAMS ((cpp_reader *, struct include_file *)); |
e5eba70a | 106 | static bool stack_include_file PARAMS ((cpp_reader *, struct include_file *)); |
a58d32c2 | 107 | static void purge_cache PARAMS ((struct include_file *)); |
a36c54fa | 108 | static void destroy_node PARAMS ((splay_tree_value)); |
c71f835b | 109 | static int report_missing_guard PARAMS ((splay_tree_node, void *)); |
a36c54fa NB |
110 | static splay_tree_node find_or_create_entry PARAMS ((cpp_reader *, |
111 | const char *)); | |
112 | static void handle_missing_header PARAMS ((cpp_reader *, const char *, int)); | |
986b1f13 | 113 | static int remove_component_p PARAMS ((const char *)); |
a36c54fa NB |
114 | |
115 | /* Set up the splay tree we use to store information about all the | |
116 | file names seen in this compilation. We also have entries for each | |
117 | file we tried to open but failed; this saves system calls since we | |
118 | don't try to open it again in future. | |
119 | ||
120 | The key of each node is the file name, after processing by | |
986b1f13 | 121 | cpp_simplify_path. The path name may or may not be absolute. |
a36c54fa NB |
122 | The path string has been malloced, as is automatically freed by |
123 | registering free () as the splay tree key deletion function. | |
124 | ||
125 | A node's value is a pointer to a struct include_file, and is never | |
126 | NULL. */ | |
d35364d1 | 127 | void |
c71f835b | 128 | _cpp_init_includes (pfile) |
d35364d1 ZW |
129 | cpp_reader *pfile; |
130 | { | |
131 | pfile->all_include_files | |
c31a6508 ZW |
132 | = splay_tree_new ((splay_tree_compare_fn) strcmp, |
133 | (splay_tree_delete_key_fn) free, | |
a36c54fa | 134 | destroy_node); |
0b3d776a | 135 | } |
add7091b | 136 | |
a36c54fa | 137 | /* Tear down the splay tree. */ |
c71f835b ZW |
138 | void |
139 | _cpp_cleanup_includes (pfile) | |
140 | cpp_reader *pfile; | |
141 | { | |
142 | splay_tree_delete (pfile->all_include_files); | |
143 | } | |
144 | ||
a36c54fa NB |
145 | /* Free a node. The path string is automatically freed. */ |
146 | static void | |
147 | destroy_node (v) | |
148 | splay_tree_value v; | |
149 | { | |
dc65cd60 | 150 | struct include_file *f = (struct include_file *) v; |
a36c54fa NB |
151 | |
152 | if (f) | |
153 | { | |
154 | purge_cache (f); | |
155 | free (f); | |
156 | } | |
157 | } | |
158 | ||
642ce434 NB |
159 | /* Mark a file to not be reread (e.g. #import, read failure). */ |
160 | void | |
161 | _cpp_never_reread (file) | |
162 | struct include_file *file; | |
163 | { | |
164 | file->cmacro = NEVER_REREAD; | |
165 | } | |
166 | ||
ba133c96 | 167 | /* Lookup a filename, which is simplified after making a copy, and |
5793b276 | 168 | create an entry if none exists. */ |
a36c54fa NB |
169 | static splay_tree_node |
170 | find_or_create_entry (pfile, fname) | |
d6d52dd6 NB |
171 | cpp_reader *pfile; |
172 | const char *fname; | |
173 | { | |
a36c54fa NB |
174 | splay_tree_node node; |
175 | struct include_file *file; | |
ba133c96 | 176 | char *name = xstrdup (fname); |
d6d52dd6 | 177 | |
986b1f13 | 178 | cpp_simplify_path (name); |
ba133c96 NB |
179 | node = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) name); |
180 | if (node) | |
181 | free (name); | |
182 | else | |
d6d52dd6 | 183 | { |
a36c54fa | 184 | file = xcnew (struct include_file); |
ba133c96 | 185 | file->name = name; |
17211ab5 | 186 | file->header_name = name; |
986b1f13 | 187 | file->err_no = errno; |
a36c54fa NB |
188 | node = splay_tree_insert (pfile->all_include_files, |
189 | (splay_tree_key) file->name, | |
190 | (splay_tree_value) file); | |
d6d52dd6 | 191 | } |
a36c54fa NB |
192 | |
193 | return node; | |
194 | } | |
195 | ||
ba133c96 | 196 | /* Enter a file name in the splay tree, for the sake of cpp_included. */ |
a36c54fa NB |
197 | void |
198 | _cpp_fake_include (pfile, fname) | |
199 | cpp_reader *pfile; | |
200 | const char *fname; | |
201 | { | |
202 | find_or_create_entry (pfile, fname); | |
d6d52dd6 NB |
203 | } |
204 | ||
a58d32c2 | 205 | /* Given a file name, look it up in the cache; if there is no entry, |
2047e26f NB |
206 | create one with a non-NULL value (regardless of success in opening |
207 | the file). If the file doesn't exist or is inaccessible, this | |
208 | entry is flagged so we don't attempt to open it again in the | |
373e2177 NB |
209 | future. If the file isn't open, open it. The empty string is |
210 | interpreted as stdin. | |
2047e26f NB |
211 | |
212 | Returns an include_file structure with an open file descriptor on | |
213 | success, or NULL on failure. */ | |
c31a6508 | 214 | static struct include_file * |
2047e26f | 215 | open_file (pfile, filename) |
c31a6508 ZW |
216 | cpp_reader *pfile; |
217 | const char *filename; | |
2047e26f | 218 | { |
a36c54fa NB |
219 | splay_tree_node nd = find_or_create_entry (pfile, filename); |
220 | struct include_file *file = (struct include_file *) nd->value; | |
add7091b | 221 | |
f277b5e0 NB |
222 | if (file->err_no) |
223 | { | |
224 | /* Ugh. handle_missing_header () needs errno to be set. */ | |
225 | errno = file->err_no; | |
226 | return 0; | |
227 | } | |
2047e26f | 228 | |
ec5c56db | 229 | /* Don't reopen an idempotent file. */ |
a36c54fa NB |
230 | if (DO_NOT_REREAD (file)) |
231 | return file; | |
df383483 | 232 | |
ec5c56db | 233 | /* Don't reopen one which is already loaded. */ |
26aea073 | 234 | if (0 && file->buffer != NULL) |
a36c54fa | 235 | return file; |
add7091b | 236 | |
c31a6508 ZW |
237 | /* We used to open files in nonblocking mode, but that caused more |
238 | problems than it solved. Do take care not to acquire a | |
239 | controlling terminal by mistake (this can't happen on sane | |
240 | systems, but paranoia is a virtue). | |
add7091b | 241 | |
c31a6508 ZW |
242 | Use the three-argument form of open even though we aren't |
243 | specifying O_CREAT, to defend against broken system headers. | |
add7091b | 244 | |
c31a6508 ZW |
245 | O_BINARY tells some runtime libraries (notably DJGPP) not to do |
246 | newline translation; we can handle DOS line breaks just fine | |
247 | ourselves. | |
b0699dad | 248 | |
c31a6508 | 249 | Special case: the empty string is translated to stdin. */ |
d4506961 | 250 | |
c31a6508 | 251 | if (filename[0] == '\0') |
85be8c2d AP |
252 | { |
253 | file->fd = 0; | |
254 | #ifdef __DJGPP__ | |
255 | /* For DJGPP redirected input is opened in text mode. Change it | |
256 | to binary mode. */ | |
257 | if (! isatty (file->fd)) | |
df383483 | 258 | setmode (file->fd, O_BINARY); |
85be8c2d AP |
259 | #endif |
260 | } | |
f2d5f0cc | 261 | else |
ba133c96 | 262 | file->fd = open (file->name, O_RDONLY | O_NOCTTY | O_BINARY, 0666); |
a58d32c2 | 263 | |
2047e26f NB |
264 | if (file->fd != -1 && fstat (file->fd, &file->st) == 0) |
265 | { | |
c0bfe993 NB |
266 | if (!S_ISDIR (file->st.st_mode)) |
267 | return file; | |
55485cd9 | 268 | |
7c092714 NB |
269 | /* If it's a directory, we return null and continue the search |
270 | as the file we're looking for may appear elsewhere in the | |
271 | search path. */ | |
c0bfe993 | 272 | errno = ENOENT; |
55485cd9 ZW |
273 | close (file->fd); |
274 | file->fd = -1; | |
2047e26f | 275 | } |
a58d32c2 | 276 | |
f277b5e0 | 277 | file->err_no = errno; |
a58d32c2 ZW |
278 | return 0; |
279 | } | |
280 | ||
17211ab5 GK |
281 | static struct include_file * |
282 | validate_pch (pfile, filename, pchname) | |
283 | cpp_reader *pfile; | |
284 | const char *filename; | |
285 | const char *pchname; | |
286 | { | |
287 | struct include_file * file; | |
288 | ||
289 | file = open_file (pfile, pchname); | |
290 | if (file == NULL) | |
291 | return NULL; | |
292 | if ((file->pch & 2) == 0) | |
293 | file->pch = pfile->cb.valid_pch (pfile, pchname, file->fd); | |
294 | if (INCLUDE_PCH_P (file)) | |
295 | { | |
5793b276 | 296 | char *f = xstrdup (filename); |
986b1f13 | 297 | cpp_simplify_path (f); |
5793b276 | 298 | file->header_name = f; |
17211ab5 GK |
299 | return file; |
300 | } | |
301 | close (file->fd); | |
302 | file->fd = -1; | |
303 | return NULL; | |
304 | } | |
305 | ||
306 | ||
307 | /* Like open_file, but also look for a precompiled header if (a) one exists | |
308 | and (b) it is valid. */ | |
309 | static struct include_file * | |
310 | open_file_pch (pfile, filename) | |
311 | cpp_reader *pfile; | |
312 | const char *filename; | |
313 | { | |
314 | if (filename[0] != '\0' | |
315 | && pfile->cb.valid_pch != NULL) | |
316 | { | |
317 | size_t namelen = strlen (filename); | |
318 | char *pchname = alloca (namelen + 5); | |
319 | struct include_file * file; | |
320 | splay_tree_node nd; | |
321 | ||
322 | memcpy (pchname, filename, namelen); | |
d8fad4ea | 323 | memcpy (pchname + namelen, ".gch", 5); |
17211ab5 GK |
324 | |
325 | nd = find_or_create_entry (pfile, pchname); | |
326 | file = (struct include_file *) nd->value; | |
327 | ||
328 | if (file != NULL) | |
329 | { | |
330 | if (stat (file->name, &file->st) == 0 && S_ISDIR (file->st.st_mode)) | |
331 | { | |
332 | DIR * thedir; | |
333 | struct dirent *d; | |
334 | size_t subname_len = namelen + 64; | |
335 | char *subname = xmalloc (subname_len); | |
336 | ||
337 | thedir = opendir (pchname); | |
338 | if (thedir == NULL) | |
339 | return NULL; | |
340 | memcpy (subname, pchname, namelen + 4); | |
341 | subname[namelen+4] = '/'; | |
342 | while ((d = readdir (thedir)) != NULL) | |
343 | { | |
344 | if (strlen (d->d_name) + namelen + 7 > subname_len) | |
345 | { | |
346 | subname_len = strlen (d->d_name) + namelen + 64; | |
347 | subname = xrealloc (subname, subname_len); | |
348 | } | |
349 | strcpy (subname + namelen + 5, d->d_name); | |
350 | file = validate_pch (pfile, filename, subname); | |
351 | if (file) | |
352 | break; | |
353 | } | |
354 | closedir (thedir); | |
355 | free (subname); | |
356 | } | |
357 | else | |
358 | file = validate_pch (pfile, filename, pchname); | |
359 | if (file) | |
360 | return file; | |
361 | } | |
362 | } | |
363 | return open_file (pfile, filename); | |
364 | } | |
365 | ||
e5eba70a NB |
366 | /* Place the file referenced by INC into a new buffer on the buffer |
367 | stack, unless there are errors, or the file is not re-included | |
368 | because of e.g. multiple-include guards. Returns true if a buffer | |
369 | is stacked. */ | |
e5eba70a | 370 | static bool |
a58d32c2 ZW |
371 | stack_include_file (pfile, inc) |
372 | cpp_reader *pfile; | |
373 | struct include_file *inc; | |
374 | { | |
375 | cpp_buffer *fp; | |
e5eba70a | 376 | int sysp; |
bb74c963 | 377 | const char *filename; |
51d0f328 | 378 | |
e5eba70a NB |
379 | if (DO_NOT_REREAD (inc)) |
380 | return false; | |
381 | ||
47d89cf3 | 382 | sysp = MAX ((pfile->map ? pfile->map->sysp : 0), |
11bca309 | 383 | (inc->foundhere ? inc->foundhere->sysp : 0)); |
51d0f328 | 384 | |
182d89a3 | 385 | /* Add the file to the dependencies on its first inclusion. */ |
f4ff5a69 | 386 | if (CPP_OPTION (pfile, deps.style) > !!sysp && !inc->include_count) |
182d89a3 NB |
387 | { |
388 | if (pfile->buffer || CPP_OPTION (pfile, deps.ignore_main_file) == 0) | |
389 | deps_add_dep (pfile->deps, inc->name); | |
390 | } | |
51d0f328 | 391 | |
17211ab5 GK |
392 | /* PCH files get dealt with immediately. */ |
393 | if (INCLUDE_PCH_P (inc)) | |
394 | { | |
395 | pfile->cb.read_pch (pfile, inc->name, inc->fd, inc->header_name); | |
396 | close (inc->fd); | |
397 | inc->fd = -1; | |
398 | return false; | |
399 | } | |
400 | ||
7c092714 | 401 | /* Not in cache? */ |
26aea073 | 402 | if (1 || ! inc->buffer) |
7c092714 | 403 | { |
4d6baafa | 404 | if (read_include_file (pfile, inc)) |
e5eba70a | 405 | { |
c0bfe993 | 406 | /* If an error occurs, do not try to read this file again. */ |
e5eba70a NB |
407 | _cpp_never_reread (inc); |
408 | return false; | |
409 | } | |
4d6baafa NB |
410 | /* Mark a regular, zero-length file never-reread. We read it, |
411 | NUL-terminate it, and stack it once, so preprocessing a main | |
412 | file of zero length does not raise an error. */ | |
413 | if (S_ISREG (inc->st.st_mode) && inc->st.st_size == 0) | |
414 | _cpp_never_reread (inc); | |
7c092714 NB |
415 | close (inc->fd); |
416 | inc->fd = -1; | |
417 | } | |
418 | ||
e5eba70a | 419 | if (pfile->buffer) |
5993019d NB |
420 | /* We don't want MI guard advice for the main file. */ |
421 | inc->include_count++; | |
eb1f4d9d NB |
422 | |
423 | /* Push a buffer. */ | |
29401c30 NB |
424 | fp = cpp_push_buffer (pfile, inc->buffer, inc->st.st_size, |
425 | /* from_stage3 */ CPP_OPTION (pfile, preprocessed), 0); | |
eb1f4d9d | 426 | fp->inc = inc; |
a58d32c2 | 427 | |
4912a07c | 428 | /* Initialize controlling macro state. */ |
6d18adbc | 429 | pfile->mi_valid = true; |
3cf3593f | 430 | pfile->mi_cmacro = 0; |
eb1f4d9d NB |
431 | |
432 | /* Generate the call back. */ | |
bb74c963 NB |
433 | filename = inc->name; |
434 | if (*filename == '\0') | |
0b264069 | 435 | filename = "<stdin>"; |
bb74c963 | 436 | _cpp_do_file_change (pfile, LC_ENTER, filename, 1, sysp); |
e5eba70a NB |
437 | |
438 | return true; | |
a58d32c2 ZW |
439 | } |
440 | ||
441 | /* Read the file referenced by INC into the file cache. | |
442 | ||
443 | If fd points to a plain file, we might be able to mmap it; we can | |
444 | definitely allocate the buffer all at once. If fd is a pipe or | |
445 | terminal, we can't do either. If fd is something weird, like a | |
7c092714 | 446 | block device, we don't want to read it at all. |
a58d32c2 ZW |
447 | |
448 | Unfortunately, different systems use different st.st_mode values | |
449 | for pipes: some have S_ISFIFO, some S_ISSOCK, some are buggy and | |
450 | zero the entire struct stat except a couple fields. Hence we don't | |
7c092714 NB |
451 | even try to figure out what something is, except for plain files |
452 | and block devices. | |
a58d32c2 ZW |
453 | |
454 | FIXME: Flush file cache and try again if we run out of memory. */ | |
7c092714 | 455 | static int |
a58d32c2 ZW |
456 | read_include_file (pfile, inc) |
457 | cpp_reader *pfile; | |
458 | struct include_file *inc; | |
459 | { | |
460 | ssize_t size, offset, count; | |
562a5c27 | 461 | uchar *buf; |
a58d32c2 ZW |
462 | |
463 | if (S_ISREG (inc->st.st_mode)) | |
f2d5f0cc | 464 | { |
a58d32c2 ZW |
465 | /* off_t might have a wider range than ssize_t - in other words, |
466 | the max size of a file might be bigger than the address | |
467 | space. We can't handle a file that large. (Anyone with | |
468 | a single source file bigger than 2GB needs to rethink | |
469 | their coding style.) Some systems (e.g. AIX 4.1) define | |
470 | SSIZE_MAX to be much smaller than the actual range of the | |
471 | type. Use INTTYPE_MAXIMUM unconditionally to ensure this | |
472 | does not bite us. */ | |
473 | if (inc->st.st_size > INTTYPE_MAXIMUM (ssize_t)) | |
f2d5f0cc | 474 | { |
ebef4e8c | 475 | cpp_error (pfile, DL_ERROR, "%s is too large", inc->name); |
a58d32c2 | 476 | goto fail; |
f2d5f0cc | 477 | } |
a58d32c2 ZW |
478 | size = inc->st.st_size; |
479 | ||
d4506961 | 480 | { |
562a5c27 | 481 | buf = (uchar *) xmalloc (size + 1); |
a58d32c2 ZW |
482 | offset = 0; |
483 | while (offset < size) | |
484 | { | |
485 | count = read (inc->fd, buf + offset, size - offset); | |
486 | if (count < 0) | |
487 | goto perror_fail; | |
488 | if (count == 0) | |
489 | { | |
ae1139f9 | 490 | if (!STAT_SIZE_TOO_BIG (inc->st)) |
ebef4e8c NB |
491 | cpp_error (pfile, DL_WARNING, |
492 | "%s is shorter than expected", inc->name); | |
cdb29058 DR |
493 | size = offset; |
494 | buf = xrealloc (buf, size + 1); | |
495 | inc->st.st_size = size; | |
a58d32c2 ZW |
496 | break; |
497 | } | |
498 | offset += count; | |
499 | } | |
26aea073 NB |
500 | /* The lexer requires that the buffer be \n-terminated. */ |
501 | buf[size] = '\n'; | |
d4506961 | 502 | } |
a58d32c2 ZW |
503 | } |
504 | else if (S_ISBLK (inc->st.st_mode)) | |
505 | { | |
ebef4e8c | 506 | cpp_error (pfile, DL_ERROR, "%s is a block device", inc->name); |
a58d32c2 ZW |
507 | goto fail; |
508 | } | |
a58d32c2 ZW |
509 | else |
510 | { | |
511 | /* 8 kilobytes is a sensible starting size. It ought to be | |
512 | bigger than the kernel pipe buffer, and it's definitely | |
513 | bigger than the majority of C source files. */ | |
514 | size = 8 * 1024; | |
d4506961 | 515 | |
562a5c27 | 516 | buf = (uchar *) xmalloc (size + 1); |
a58d32c2 ZW |
517 | offset = 0; |
518 | while ((count = read (inc->fd, buf + offset, size - offset)) > 0) | |
f2d5f0cc | 519 | { |
a58d32c2 ZW |
520 | offset += count; |
521 | if (offset == size) | |
4d6baafa NB |
522 | { |
523 | size *= 2; | |
524 | buf = xrealloc (buf, size + 1); | |
525 | } | |
f2d5f0cc | 526 | } |
a58d32c2 ZW |
527 | if (count < 0) |
528 | goto perror_fail; | |
529 | ||
4d6baafa NB |
530 | if (offset + 1 < size) |
531 | buf = xrealloc (buf, offset + 1); | |
532 | ||
26aea073 NB |
533 | /* The lexer requires that the buffer be \n-terminated. */ |
534 | buf[offset] = '\n'; | |
a58d32c2 | 535 | inc->st.st_size = offset; |
f2d5f0cc | 536 | } |
d7a2e0f7 | 537 | |
a58d32c2 | 538 | inc->buffer = buf; |
7c092714 | 539 | return 0; |
a58d32c2 ZW |
540 | |
541 | perror_fail: | |
ebef4e8c | 542 | cpp_errno (pfile, DL_ERROR, inc->name); |
a58d32c2 | 543 | fail: |
7c092714 | 544 | return 1; |
a58d32c2 ZW |
545 | } |
546 | ||
26aea073 | 547 | /* Drop INC's buffer from memory. */ |
a58d32c2 ZW |
548 | static void |
549 | purge_cache (inc) | |
550 | struct include_file *inc; | |
551 | { | |
552 | if (inc->buffer) | |
c31a6508 | 553 | { |
26aea073 | 554 | free ((PTR) inc->buffer); |
a58d32c2 | 555 | inc->buffer = NULL; |
c31a6508 | 556 | } |
e576beb0 ZW |
557 | } |
558 | ||
c31a6508 ZW |
559 | /* Return 1 if the file named by FNAME has been included before in |
560 | any context, 0 otherwise. */ | |
561 | int | |
562 | cpp_included (pfile, fname) | |
add7091b | 563 | cpp_reader *pfile; |
bcc5cac9 | 564 | const char *fname; |
add7091b | 565 | { |
5793b276 | 566 | struct cpp_path *path; |
e7182666 | 567 | char *name, *n; |
c31a6508 | 568 | splay_tree_node nd; |
0b3d776a | 569 | |
05e81724 | 570 | if (IS_ABSOLUTE_PATHNAME (fname)) |
0b3d776a | 571 | { |
c31a6508 ZW |
572 | /* Just look it up. */ |
573 | nd = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) fname); | |
574 | return (nd && nd->value); | |
0b3d776a | 575 | } |
df383483 | 576 | |
c31a6508 | 577 | /* Search directory path for the file. */ |
b6464a73 | 578 | name = (char *) alloca (strlen (fname) + pfile->max_include_len + 2); |
5793b276 | 579 | for (path = pfile->quote_include; path; path = path->next) |
0b3d776a | 580 | { |
591e15a1 NB |
581 | memcpy (name, path->name, path->len); |
582 | name[path->len] = '/'; | |
583 | strcpy (&name[path->len + 1], fname); | |
c31a6508 | 584 | if (CPP_OPTION (pfile, remap)) |
e7182666 NB |
585 | n = remap_filename (pfile, name, path); |
586 | else | |
ba133c96 | 587 | n = name; |
c31a6508 | 588 | |
e7182666 | 589 | nd = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) n); |
c31a6508 ZW |
590 | if (nd && nd->value) |
591 | return 1; | |
0b3d776a | 592 | } |
c31a6508 | 593 | return 0; |
add7091b ZW |
594 | } |
595 | ||
74eb4b3e | 596 | /* Search for FNAME. Return 0 if there is no such file (or it's |
41947a54 NB |
597 | un-openable), in which case an error code will be in errno. If |
598 | there is no include path to use it returns NO_INCLUDE_PATH, | |
599 | otherwise an include_file structure. If this request originates | |
5d8ebbd8 | 600 | from a directive of TYPE #include_next, set INCLUDE_NEXT to true. */ |
c31a6508 | 601 | static struct include_file * |
74eb4b3e | 602 | find_include_file (pfile, fname, angle_brackets, type) |
f2d5f0cc | 603 | cpp_reader *pfile; |
74eb4b3e NB |
604 | const char *fname; |
605 | int angle_brackets; | |
ba133c96 | 606 | enum include_type type; |
f2d5f0cc | 607 | { |
5793b276 | 608 | struct cpp_path *path; |
c31a6508 | 609 | struct include_file *file; |
e7182666 | 610 | char *name, *n; |
add7091b | 611 | |
74eb4b3e NB |
612 | if (*fname == '\0') |
613 | { | |
614 | cpp_error (pfile, DL_ERROR, "empty file name"); | |
615 | return NO_INCLUDE_PATH; | |
616 | } | |
617 | ||
05e81724 | 618 | if (IS_ABSOLUTE_PATHNAME (fname)) |
17211ab5 | 619 | return open_file_pch (pfile, fname); |
41947a54 NB |
620 | |
621 | /* For #include_next, skip in the search path past the dir in which | |
e7182666 NB |
622 | the current file was found, but if it was found via an absolute |
623 | path use the normal search logic. */ | |
ba133c96 | 624 | if (type == IT_INCLUDE_NEXT && pfile->buffer->inc->foundhere) |
41947a54 | 625 | path = pfile->buffer->inc->foundhere->next; |
74eb4b3e | 626 | else if (angle_brackets) |
5793b276 | 627 | path = pfile->bracket_include; |
41947a54 | 628 | else |
ba133c96 | 629 | path = search_from (pfile, type); |
41947a54 NB |
630 | |
631 | if (path == NULL) | |
632 | { | |
ebef4e8c NB |
633 | cpp_error (pfile, DL_ERROR, "no include path in which to find %s", |
634 | fname); | |
41947a54 NB |
635 | return NO_INCLUDE_PATH; |
636 | } | |
637 | ||
c31a6508 | 638 | /* Search directory path for the file. */ |
b6464a73 | 639 | name = (char *) alloca (strlen (fname) + pfile->max_include_len + 2); |
41947a54 | 640 | for (; path; path = path->next) |
add7091b | 641 | { |
55485cd9 ZW |
642 | int len = path->len; |
643 | memcpy (name, path->name, len); | |
644 | /* Don't turn / into // or // into ///; // may be a namespace | |
645 | escape. */ | |
646 | if (name[len-1] == '/') | |
647 | len--; | |
648 | name[len] = '/'; | |
649 | strcpy (&name[len + 1], fname); | |
c31a6508 | 650 | if (CPP_OPTION (pfile, remap)) |
e7182666 NB |
651 | n = remap_filename (pfile, name, path); |
652 | else | |
ba133c96 | 653 | n = name; |
c31a6508 | 654 | |
17211ab5 | 655 | file = open_file_pch (pfile, n); |
c31a6508 | 656 | if (file) |
add7091b | 657 | { |
c31a6508 ZW |
658 | file->foundhere = path; |
659 | return file; | |
add7091b ZW |
660 | } |
661 | } | |
591e15a1 | 662 | |
c31a6508 | 663 | return 0; |
add7091b ZW |
664 | } |
665 | ||
e605b040 | 666 | /* Not everyone who wants to set system-header-ness on a buffer can |
642ce434 NB |
667 | see the details of a buffer. This is an exported interface because |
668 | fix-header needs it. */ | |
e605b040 | 669 | void |
614c7d37 | 670 | cpp_make_system_header (pfile, syshdr, externc) |
e605b040 | 671 | cpp_reader *pfile; |
614c7d37 | 672 | int syshdr, externc; |
e605b040 | 673 | { |
614c7d37 NB |
674 | int flags = 0; |
675 | ||
676 | /* 1 = system header, 2 = system header to be treated as C. */ | |
677 | if (syshdr) | |
678 | flags = 1 + (externc != 0); | |
47d89cf3 NB |
679 | _cpp_do_file_change (pfile, LC_RENAME, pfile->map->to_file, |
680 | SOURCE_LINE (pfile->map, pfile->line), flags); | |
e605b040 ZW |
681 | } |
682 | ||
b4e46cea PB |
683 | /* Allow the client to change the current file. Used by the front end |
684 | to achieve pseudo-file names like <built-in>. | |
685 | If REASON is LC_LEAVE, then NEW_NAME must be NULL. */ | |
c19b12cb | 686 | void |
b4e46cea | 687 | cpp_change_file (pfile, reason, new_name) |
c19b12cb | 688 | cpp_reader *pfile; |
b4e46cea | 689 | enum lc_reason reason; |
c19b12cb NB |
690 | const char *new_name; |
691 | { | |
b4e46cea | 692 | _cpp_do_file_change (pfile, reason, new_name, 1, 0); |
c19b12cb NB |
693 | } |
694 | ||
c71f835b ZW |
695 | /* Report on all files that might benefit from a multiple include guard. |
696 | Triggered by -H. */ | |
697 | void | |
698 | _cpp_report_missing_guards (pfile) | |
699 | cpp_reader *pfile; | |
700 | { | |
701 | int banner = 0; | |
702 | splay_tree_foreach (pfile->all_include_files, report_missing_guard, | |
703 | (PTR) &banner); | |
704 | } | |
705 | ||
5d8ebbd8 | 706 | /* Callback function for splay_tree_foreach(). */ |
c71f835b ZW |
707 | static int |
708 | report_missing_guard (n, b) | |
709 | splay_tree_node n; | |
710 | void *b; | |
711 | { | |
712 | struct include_file *f = (struct include_file *) n->value; | |
dc65cd60 | 713 | int *bannerp = (int *) b; |
c71f835b ZW |
714 | |
715 | if (f && f->cmacro == 0 && f->include_count == 1) | |
716 | { | |
717 | if (*bannerp == 0) | |
718 | { | |
719 | fputs (_("Multiple include guards may be useful for:\n"), stderr); | |
720 | *bannerp = 1; | |
721 | } | |
722 | fputs (f->name, stderr); | |
723 | putc ('\n', stderr); | |
724 | } | |
725 | return 0; | |
726 | } | |
727 | ||
5d8ebbd8 | 728 | /* Create a dependency for file FNAME, or issue an error message as |
da7d8304 | 729 | appropriate. ANGLE_BRACKETS is nonzero if the file was bracketed |
5d8ebbd8 | 730 | like <..>. */ |
a36c54fa NB |
731 | static void |
732 | handle_missing_header (pfile, fname, angle_brackets) | |
733 | cpp_reader *pfile; | |
734 | const char *fname; | |
735 | int angle_brackets; | |
736 | { | |
f4ff5a69 NB |
737 | bool print_dep |
738 | = CPP_OPTION (pfile, deps.style) > (angle_brackets || pfile->map->sysp); | |
dc65cd60 | 739 | |
f4ff5a69 | 740 | if (CPP_OPTION (pfile, deps.missing_files) && print_dep) |
3f8ffc7c | 741 | deps_add_dep (pfile->deps, fname); |
e7182666 NB |
742 | /* If -M was specified, then don't count this as an error, because |
743 | we can still produce correct output. Otherwise, we can't produce | |
744 | correct output, because there may be dependencies we need inside | |
745 | the missing file, and we don't know what directory this missing | |
ebef4e8c | 746 | file exists in. */ |
a36c54fa | 747 | else |
f4ff5a69 | 748 | cpp_errno (pfile, CPP_OPTION (pfile, deps.style) && ! print_dep |
ebef4e8c | 749 | ? DL_WARNING: DL_ERROR, fname); |
a36c54fa NB |
750 | } |
751 | ||
5d8ebbd8 NB |
752 | /* Handles #include-family directives (distinguished by TYPE), |
753 | including HEADER, and the command line -imacros and -include. | |
754 | Returns true if a buffer was stacked. */ | |
e5eba70a | 755 | bool |
74eb4b3e | 756 | _cpp_execute_include (pfile, fname, angle_brackets, type) |
168d3732 | 757 | cpp_reader *pfile; |
74eb4b3e NB |
758 | const char *fname; |
759 | int angle_brackets; | |
ba133c96 | 760 | enum include_type type; |
168d3732 | 761 | { |
e5eba70a | 762 | bool stacked = false; |
74eb4b3e | 763 | struct include_file *inc; |
642ce434 | 764 | |
74eb4b3e | 765 | inc = find_include_file (pfile, fname, angle_brackets, type); |
41947a54 | 766 | if (inc == 0) |
74eb4b3e | 767 | handle_missing_header (pfile, fname, angle_brackets); |
41947a54 | 768 | else if (inc != NO_INCLUDE_PATH) |
168d3732 | 769 | { |
e5eba70a | 770 | stacked = stack_include_file (pfile, inc); |
51d0f328 | 771 | |
ba133c96 | 772 | if (type == IT_IMPORT) |
e7182666 | 773 | _cpp_never_reread (inc); |
168d3732 | 774 | } |
ba133c96 | 775 | |
e5eba70a | 776 | return stacked; |
168d3732 ZW |
777 | } |
778 | ||
41947a54 NB |
779 | /* Locate HEADER, and determine whether it is newer than the current |
780 | file. If it cannot be located or dated, return -1, if it is newer | |
781 | newer, return 1, otherwise 0. */ | |
f3f751ad | 782 | int |
74eb4b3e | 783 | _cpp_compare_file_date (pfile, fname, angle_brackets) |
f3f751ad | 784 | cpp_reader *pfile; |
74eb4b3e NB |
785 | const char *fname; |
786 | int angle_brackets; | |
f3f751ad | 787 | { |
74eb4b3e | 788 | struct include_file *inc; |
df383483 | 789 | |
74eb4b3e | 790 | inc = find_include_file (pfile, fname, angle_brackets, IT_INCLUDE); |
41947a54 | 791 | if (inc == NULL || inc == NO_INCLUDE_PATH) |
f3f751ad | 792 | return -1; |
41947a54 | 793 | |
a58d32c2 | 794 | if (inc->fd > 0) |
f3f751ad | 795 | { |
f3f751ad NS |
796 | close (inc->fd); |
797 | inc->fd = -1; | |
798 | } | |
df383483 | 799 | |
41947a54 | 800 | return inc->st.st_mtime > pfile->buffer->inc->st.st_mtime; |
f3f751ad NS |
801 | } |
802 | ||
803 | ||
e5eba70a NB |
804 | /* Push an input buffer and load it up with the contents of FNAME. If |
805 | FNAME is "", read standard input. Return true if a buffer was | |
806 | stacked. */ | |
807 | bool | |
614c7d37 | 808 | _cpp_read_file (pfile, fname) |
c45da1ca ZW |
809 | cpp_reader *pfile; |
810 | const char *fname; | |
811 | { | |
17211ab5 GK |
812 | /* This uses open_file, because we don't allow a PCH to be used as |
813 | the toplevel compilation (that would prevent re-compiling an | |
814 | existing PCH without deleting it first). */ | |
373e2177 | 815 | struct include_file *f = open_file (pfile, fname); |
c45da1ca | 816 | |
041c3194 | 817 | if (f == NULL) |
c0bfe993 | 818 | { |
ebef4e8c | 819 | cpp_errno (pfile, DL_ERROR, fname); |
c0bfe993 NB |
820 | return false; |
821 | } | |
041c3194 | 822 | |
c0bfe993 | 823 | return stack_include_file (pfile, f); |
f8f769ea ZW |
824 | } |
825 | ||
c19b12cb NB |
826 | /* Pushes the given file onto the buffer stack. Returns nonzero if |
827 | successful. */ | |
828 | bool | |
829 | cpp_push_include (pfile, filename) | |
830 | cpp_reader *pfile; | |
831 | const char *filename; | |
832 | { | |
c19b12cb NB |
833 | /* Make the command line directive take up a line. */ |
834 | pfile->line++; | |
74eb4b3e | 835 | return _cpp_execute_include (pfile, filename, false, IT_CMDLINE); |
c19b12cb NB |
836 | } |
837 | ||
5d8ebbd8 | 838 | /* Do appropriate cleanup when a file INC's buffer is popped off the |
af0d16cd NB |
839 | input stack. */ |
840 | void | |
29401c30 | 841 | _cpp_pop_file_buffer (pfile, inc) |
f9a0e96c | 842 | cpp_reader *pfile; |
29401c30 | 843 | struct include_file *inc; |
f9a0e96c | 844 | { |
ba133c96 | 845 | /* Record the inclusion-preventing macro, which could be NULL |
6d18adbc NB |
846 | meaning no controlling macro. */ |
847 | if (pfile->mi_valid && inc->cmacro == NULL) | |
ba133c96 | 848 | inc->cmacro = pfile->mi_cmacro; |
93c80368 NB |
849 | |
850 | /* Invalidate control macros in the #including file. */ | |
6d18adbc | 851 | pfile->mi_valid = false; |
f9a0e96c | 852 | |
26aea073 | 853 | purge_cache (inc); |
f9a0e96c ZW |
854 | } |
855 | ||
591e15a1 NB |
856 | /* Returns the first place in the include chain to start searching for |
857 | "" includes. This involves stripping away the basename of the | |
ba133c96 NB |
858 | current file, unless -I- was specified. |
859 | ||
860 | If we're handling -include or -imacros, use the "" chain, but with | |
861 | the preprocessor's cwd prepended. */ | |
5793b276 | 862 | static struct cpp_path * |
ba133c96 | 863 | search_from (pfile, type) |
591e15a1 | 864 | cpp_reader *pfile; |
ba133c96 | 865 | enum include_type type; |
591e15a1 NB |
866 | { |
867 | cpp_buffer *buffer = pfile->buffer; | |
868 | unsigned int dlen; | |
869 | ||
ba133c96 NB |
870 | /* Command line uses the cwd, and does not cache the result. */ |
871 | if (type == IT_CMDLINE) | |
872 | goto use_cwd; | |
873 | ||
5793b276 NB |
874 | /* Ignore the current file's directory? */ |
875 | if (pfile->quote_ignores_source_dir) | |
876 | return pfile->quote_include; | |
591e15a1 | 877 | |
ba133c96 | 878 | if (! buffer->search_cached) |
591e15a1 | 879 | { |
ba133c96 | 880 | buffer->search_cached = 1; |
591e15a1 | 881 | |
ba133c96 | 882 | dlen = lbasename (buffer->inc->name) - buffer->inc->name; |
591e15a1 | 883 | |
ba133c96 NB |
884 | if (dlen) |
885 | { | |
886 | /* We don't guarantee NAME is null-terminated. This saves | |
29401c30 | 887 | allocating and freeing memory. Drop a trailing '/'. */ |
5793b276 | 888 | buffer->dir.name = (char *) buffer->inc->name; |
ba133c96 NB |
889 | if (dlen > 1) |
890 | dlen--; | |
891 | } | |
892 | else | |
893 | { | |
894 | use_cwd: | |
5793b276 | 895 | buffer->dir.name = (char *) "."; |
ba133c96 NB |
896 | dlen = 1; |
897 | } | |
898 | ||
899 | if (dlen > pfile->max_include_len) | |
900 | pfile->max_include_len = dlen; | |
901 | ||
902 | buffer->dir.len = dlen; | |
5793b276 | 903 | buffer->dir.next = pfile->quote_include; |
47d89cf3 | 904 | buffer->dir.sysp = pfile->map->sysp; |
ba133c96 | 905 | } |
591e15a1 NB |
906 | |
907 | return &buffer->dir; | |
908 | } | |
909 | ||
c31a6508 ZW |
910 | /* The file_name_map structure holds a mapping of file names for a |
911 | particular directory. This mapping is read from the file named | |
912 | FILE_NAME_MAP_FILE in that directory. Such a file can be used to | |
913 | map filenames on a file system with severe filename restrictions, | |
914 | such as DOS. The format of the file name map file is just a series | |
915 | of lines with two tokens on each line. The first token is the name | |
916 | to map, and the second token is the actual name to use. */ | |
dc65cd60 | 917 | struct file_name_map { |
c31a6508 ZW |
918 | struct file_name_map *map_next; |
919 | char *map_from; | |
920 | char *map_to; | |
921 | }; | |
922 | ||
923 | #define FILE_NAME_MAP_FILE "header.gcc" | |
924 | ||
925 | /* Read a space delimited string of unlimited length from a stdio | |
5d8ebbd8 | 926 | file F. */ |
c31a6508 ZW |
927 | static char * |
928 | read_filename_string (ch, f) | |
929 | int ch; | |
930 | FILE *f; | |
931 | { | |
932 | char *alloc, *set; | |
933 | int len; | |
934 | ||
935 | len = 20; | |
936 | set = alloc = xmalloc (len + 1); | |
dc65cd60 | 937 | if (! is_space (ch)) |
c31a6508 ZW |
938 | { |
939 | *set++ = ch; | |
dc65cd60 | 940 | while ((ch = getc (f)) != EOF && ! is_space (ch)) |
c31a6508 ZW |
941 | { |
942 | if (set - alloc == len) | |
943 | { | |
944 | len *= 2; | |
945 | alloc = xrealloc (alloc, len + 1); | |
946 | set = alloc + len / 2; | |
947 | } | |
948 | *set++ = ch; | |
949 | } | |
950 | } | |
951 | *set = '\0'; | |
952 | ungetc (ch, f); | |
953 | return alloc; | |
954 | } | |
955 | ||
956 | /* This structure holds a linked list of file name maps, one per directory. */ | |
dc65cd60 | 957 | struct file_name_map_list { |
c31a6508 ZW |
958 | struct file_name_map_list *map_list_next; |
959 | char *map_list_name; | |
960 | struct file_name_map *map_list_map; | |
961 | }; | |
962 | ||
963 | /* Read the file name map file for DIRNAME. */ | |
c31a6508 ZW |
964 | static struct file_name_map * |
965 | read_name_map (pfile, dirname) | |
966 | cpp_reader *pfile; | |
967 | const char *dirname; | |
968 | { | |
b3694847 | 969 | struct file_name_map_list *map_list_ptr; |
c31a6508 ZW |
970 | char *name; |
971 | FILE *f; | |
972 | ||
8767c894 | 973 | /* Check the cache of directories, and mappings in their remap file. */ |
c31a6508 ZW |
974 | for (map_list_ptr = CPP_OPTION (pfile, map_list); map_list_ptr; |
975 | map_list_ptr = map_list_ptr->map_list_next) | |
976 | if (! strcmp (map_list_ptr->map_list_name, dirname)) | |
977 | return map_list_ptr->map_list_map; | |
978 | ||
979 | map_list_ptr = ((struct file_name_map_list *) | |
980 | xmalloc (sizeof (struct file_name_map_list))); | |
981 | map_list_ptr->map_list_name = xstrdup (dirname); | |
8767c894 NB |
982 | |
983 | /* The end of the list ends in NULL. */ | |
4b588241 | 984 | map_list_ptr->map_list_map = NULL; |
c31a6508 ZW |
985 | |
986 | name = (char *) alloca (strlen (dirname) + strlen (FILE_NAME_MAP_FILE) + 2); | |
987 | strcpy (name, dirname); | |
988 | if (*dirname) | |
989 | strcat (name, "/"); | |
990 | strcat (name, FILE_NAME_MAP_FILE); | |
991 | f = fopen (name, "r"); | |
8767c894 NB |
992 | |
993 | /* Silently return NULL if we cannot open. */ | |
994 | if (f) | |
c31a6508 ZW |
995 | { |
996 | int ch; | |
c31a6508 ZW |
997 | |
998 | while ((ch = getc (f)) != EOF) | |
999 | { | |
1000 | char *from, *to; | |
1001 | struct file_name_map *ptr; | |
1002 | ||
dc65cd60 | 1003 | if (is_space (ch)) |
c31a6508 ZW |
1004 | continue; |
1005 | from = read_filename_string (ch, f); | |
dc65cd60 | 1006 | while ((ch = getc (f)) != EOF && is_hspace (ch)) |
c31a6508 ZW |
1007 | ; |
1008 | to = read_filename_string (ch, f); | |
1009 | ||
1010 | ptr = ((struct file_name_map *) | |
1011 | xmalloc (sizeof (struct file_name_map))); | |
1012 | ptr->map_from = from; | |
1013 | ||
1014 | /* Make the real filename absolute. */ | |
05e81724 | 1015 | if (IS_ABSOLUTE_PATHNAME (to)) |
c31a6508 ZW |
1016 | ptr->map_to = to; |
1017 | else | |
1018 | { | |
1dcd444b | 1019 | ptr->map_to = concat (dirname, "/", to, NULL); |
c31a6508 | 1020 | free (to); |
df383483 | 1021 | } |
c31a6508 ZW |
1022 | |
1023 | ptr->map_next = map_list_ptr->map_list_map; | |
1024 | map_list_ptr->map_list_map = ptr; | |
1025 | ||
1026 | while ((ch = getc (f)) != '\n') | |
1027 | if (ch == EOF) | |
1028 | break; | |
1029 | } | |
1030 | fclose (f); | |
1031 | } | |
df383483 | 1032 | |
8767c894 | 1033 | /* Add this information to the cache. */ |
c31a6508 ZW |
1034 | map_list_ptr->map_list_next = CPP_OPTION (pfile, map_list); |
1035 | CPP_OPTION (pfile, map_list) = map_list_ptr; | |
1036 | ||
1037 | return map_list_ptr->map_list_map; | |
df383483 | 1038 | } |
c31a6508 | 1039 | |
e7182666 NB |
1040 | /* Remap an unsimplified path NAME based on the file_name_map (if any) |
1041 | for LOC. */ | |
c31a6508 ZW |
1042 | static char * |
1043 | remap_filename (pfile, name, loc) | |
1044 | cpp_reader *pfile; | |
1045 | char *name; | |
5793b276 | 1046 | struct cpp_path *loc; |
c31a6508 ZW |
1047 | { |
1048 | struct file_name_map *map; | |
8767c894 | 1049 | const char *from, *p; |
e7182666 | 1050 | char *dir; |
c31a6508 ZW |
1051 | |
1052 | if (! loc->name_map) | |
8767c894 | 1053 | { |
e7182666 NB |
1054 | /* Get a null-terminated path. */ |
1055 | char *dname = alloca (loc->len + 1); | |
1056 | memcpy (dname, loc->name, loc->len); | |
1057 | dname[loc->len] = '\0'; | |
1058 | ||
591e15a1 | 1059 | loc->name_map = read_name_map (pfile, dname); |
8767c894 NB |
1060 | if (! loc->name_map) |
1061 | return name; | |
1062 | } | |
df383483 | 1063 | |
e7182666 | 1064 | /* This works since NAME has not been simplified yet. */ |
591e15a1 | 1065 | from = name + loc->len + 1; |
df383483 | 1066 | |
c31a6508 ZW |
1067 | for (map = loc->name_map; map; map = map->map_next) |
1068 | if (!strcmp (map->map_from, from)) | |
1069 | return map->map_to; | |
1070 | ||
1071 | /* Try to find a mapping file for the particular directory we are | |
1072 | looking in. Thus #include <sys/types.h> will look up sys/types.h | |
1073 | in /usr/include/header.gcc and look up types.h in | |
1074 | /usr/include/sys/header.gcc. */ | |
1075 | p = strrchr (name, '/'); | |
1076 | if (!p) | |
c31a6508 ZW |
1077 | return name; |
1078 | ||
8767c894 | 1079 | /* We know p != name as absolute paths don't call remap_filename. */ |
c31a6508 | 1080 | if (p == name) |
ebef4e8c | 1081 | cpp_error (pfile, DL_ICE, "absolute file name in remap_filename"); |
8767c894 NB |
1082 | |
1083 | dir = (char *) alloca (p - name + 1); | |
1084 | memcpy (dir, name, p - name); | |
1085 | dir[p - name] = '\0'; | |
1086 | from = p + 1; | |
df383483 | 1087 | |
c31a6508 | 1088 | for (map = read_name_map (pfile, dir); map; map = map->map_next) |
8767c894 | 1089 | if (! strcmp (map->map_from, from)) |
c31a6508 ZW |
1090 | return map->map_to; |
1091 | ||
1092 | return name; | |
1093 | } | |
1094 | ||
5793b276 NB |
1095 | /* Set the include chain for "" to QUOTE, for <> to BRACKET. If |
1096 | QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the | |
1097 | directory of the including file. | |
f9200da2 | 1098 | |
5793b276 NB |
1099 | If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */ |
1100 | void | |
1101 | cpp_set_include_chains (pfile, quote, bracket, quote_ignores_source_dir) | |
1102 | cpp_reader *pfile; | |
1103 | cpp_path *quote, *bracket; | |
1104 | int quote_ignores_source_dir; | |
0b3d776a | 1105 | { |
5793b276 NB |
1106 | pfile->quote_include = quote; |
1107 | pfile->bracket_include = quote; | |
1108 | pfile->quote_ignores_source_dir = quote_ignores_source_dir; | |
1109 | pfile->max_include_len = 0; | |
df383483 | 1110 | |
5793b276 | 1111 | for (; quote; quote = quote->next) |
0b3d776a | 1112 | { |
5793b276 NB |
1113 | quote->name_map = NULL; |
1114 | quote->len = strlen (quote->name); | |
1115 | if (quote->len > pfile->max_include_len) | |
1116 | pfile->max_include_len = quote->len; | |
1117 | if (quote == bracket) | |
1118 | pfile->bracket_include = bracket; | |
0b3d776a | 1119 | } |
0b3d776a | 1120 | } |
986b1f13 NB |
1121 | |
1122 | /* Returns true if it is safe to remove the final component of path, | |
1123 | when it is followed by a ".." component. We use lstat to avoid | |
1124 | symlinks if we have it. If not, we can still catch errors with | |
1125 | stat (). */ | |
1126 | static int | |
1127 | remove_component_p (path) | |
1128 | const char *path; | |
1129 | { | |
1130 | struct stat s; | |
1131 | int result; | |
1132 | ||
1133 | #ifdef HAVE_LSTAT | |
1134 | result = lstat (path, &s); | |
1135 | #else | |
1136 | result = stat (path, &s); | |
1137 | #endif | |
1138 | ||
1139 | /* There's no guarantee that errno will be unchanged, even on | |
1140 | success. Cygwin's lstat(), for example, will often set errno to | |
1141 | ENOSYS. In case of success, reset errno to zero. */ | |
1142 | if (result == 0) | |
1143 | errno = 0; | |
1144 | ||
1145 | return result == 0 && S_ISDIR (s.st_mode); | |
1146 | } | |
1147 | ||
1148 | /* Simplify a path name in place, deleting redundant components. This | |
1149 | reduces OS overhead and guarantees that equivalent paths compare | |
1150 | the same (modulo symlinks). | |
1151 | ||
1152 | Transforms made: | |
1153 | foo/bar/../quux foo/quux | |
1154 | foo/./bar foo/bar | |
1155 | foo//bar foo/bar | |
1156 | /../quux /quux | |
1157 | //quux //quux (POSIX allows leading // as a namespace escape) | |
1158 | ||
1159 | Guarantees no trailing slashes. All transforms reduce the length | |
1160 | of the string. Returns PATH. errno is 0 if no error occurred; | |
1161 | nonzero if an error occurred when using stat () or lstat (). */ | |
1162 | void | |
1163 | cpp_simplify_path (path) | |
1164 | char *path ATTRIBUTE_UNUSED; | |
1165 | { | |
1166 | #ifndef VMS | |
1167 | char *from, *to; | |
1168 | char *base, *orig_base; | |
1169 | int absolute = 0; | |
1170 | ||
1171 | errno = 0; | |
1172 | /* Don't overflow the empty path by putting a '.' in it below. */ | |
1173 | if (*path == '\0') | |
1174 | return; | |
1175 | ||
1176 | #if defined (HAVE_DOS_BASED_FILE_SYSTEM) | |
1177 | /* Convert all backslashes to slashes. */ | |
1178 | for (from = path; *from; from++) | |
1179 | if (*from == '\\') *from = '/'; | |
1180 | ||
1181 | /* Skip over leading drive letter if present. */ | |
1182 | if (ISALPHA (path[0]) && path[1] == ':') | |
1183 | from = to = &path[2]; | |
1184 | else | |
1185 | from = to = path; | |
1186 | #else | |
1187 | from = to = path; | |
1188 | #endif | |
1189 | ||
1190 | /* Remove redundant leading /s. */ | |
1191 | if (*from == '/') | |
1192 | { | |
1193 | absolute = 1; | |
1194 | to++; | |
1195 | from++; | |
1196 | if (*from == '/') | |
1197 | { | |
1198 | if (*++from == '/') | |
1199 | /* 3 or more initial /s are equivalent to 1 /. */ | |
1200 | while (*++from == '/'); | |
1201 | else | |
1202 | /* On some hosts // differs from /; Posix allows this. */ | |
1203 | to++; | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | base = orig_base = to; | |
1208 | for (;;) | |
1209 | { | |
1210 | int move_base = 0; | |
1211 | ||
1212 | while (*from == '/') | |
1213 | from++; | |
1214 | ||
1215 | if (*from == '\0') | |
1216 | break; | |
1217 | ||
1218 | if (*from == '.') | |
1219 | { | |
1220 | if (from[1] == '\0') | |
1221 | break; | |
1222 | if (from[1] == '/') | |
1223 | { | |
1224 | from += 2; | |
1225 | continue; | |
1226 | } | |
1227 | else if (from[1] == '.' && (from[2] == '/' || from[2] == '\0')) | |
1228 | { | |
1229 | /* Don't simplify if there was no previous component. */ | |
1230 | if (absolute && orig_base == to) | |
1231 | { | |
1232 | from += 2; | |
1233 | continue; | |
1234 | } | |
1235 | /* Don't simplify if the previous component was "../", | |
1236 | or if an error has already occurred with (l)stat. */ | |
1237 | if (base != to && errno == 0) | |
1238 | { | |
1239 | /* We don't back up if it's a symlink. */ | |
1240 | *to = '\0'; | |
1241 | if (remove_component_p (path)) | |
1242 | { | |
1243 | while (to > base && *to != '/') | |
1244 | to--; | |
1245 | from += 2; | |
1246 | continue; | |
1247 | } | |
1248 | } | |
1249 | move_base = 1; | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | /* Add the component separator. */ | |
1254 | if (to > orig_base) | |
1255 | *to++ = '/'; | |
1256 | ||
1257 | /* Copy this component until the trailing null or '/'. */ | |
1258 | while (*from != '\0' && *from != '/') | |
1259 | *to++ = *from++; | |
1260 | ||
1261 | if (move_base) | |
1262 | base = to; | |
1263 | } | |
1264 | ||
1265 | /* Change the empty string to "." so that it is not treated as stdin. | |
1266 | Null terminate. */ | |
1267 | if (to == path) | |
1268 | *to++ = '.'; | |
1269 | *to = '\0'; | |
1270 | #else /* VMS */ | |
1271 | errno = 0; | |
1272 | #endif /* !VMS */ | |
1273 | } |