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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> |
add7091b | 26 | #include "cpplib.h" |
88ae23e7 | 27 | #include "cpphash.h" |
c1212d2f | 28 | #include "intl.h" |
168d3732 | 29 | #include "mkdeps.h" |
c31a6508 | 30 | #include "splay-tree.h" |
f8f769ea | 31 | |
d7a2e0f7 ZW |
32 | #ifndef O_BINARY |
33 | # define O_BINARY 0 | |
34 | #endif | |
35 | ||
a58d32c2 ZW |
36 | /* If errno is inspected immediately after a system call fails, it will be |
37 | nonzero, and no error number will ever be zero. */ | |
38 | #ifndef ENOENT | |
39 | # define ENOENT 0 | |
40 | #endif | |
41 | #ifndef ENOTDIR | |
42 | # define ENOTDIR 0 | |
43 | #endif | |
a58d32c2 | 44 | |
642ce434 | 45 | /* This structure is used for the table of all includes. */ |
dc65cd60 | 46 | struct include_file { |
642ce434 | 47 | const char *name; /* actual path name of file */ |
17211ab5 | 48 | const char *header_name; /* the original header found */ |
642ce434 | 49 | const cpp_hashnode *cmacro; /* macro, if any, preventing reinclusion. */ |
5793b276 | 50 | const struct cpp_path *foundhere; |
642ce434 NB |
51 | /* location in search path where file was |
52 | found, for #include_next and sysp. */ | |
53 | const unsigned char *buffer; /* pointer to cached file contents */ | |
54 | struct stat st; /* copy of stat(2) data for file */ | |
55 | int fd; /* fd open on file (short term storage only) */ | |
f277b5e0 | 56 | int err_no; /* errno obtained if opening a file failed */ |
642ce434 | 57 | unsigned short include_count; /* number of times file has been read */ |
17211ab5 GK |
58 | unsigned char pch; /* 0: file not known to be a PCH. |
59 | 1: file is a PCH | |
60 | (on return from find_include_file). | |
61 | 2: file is not and never will be a valid | |
62 | precompiled header. | |
63 | 3: file is always a valid precompiled | |
64 | header. */ | |
642ce434 NB |
65 | }; |
66 | ||
ae1139f9 | 67 | /* Variable length record files on VMS will have a stat size that includes |
3ef42a0c | 68 | record control characters that won't be included in the read size. */ |
ae1139f9 DR |
69 | #ifdef VMS |
70 | # define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */ | |
71 | # define STAT_SIZE_TOO_BIG(ST) ((ST).st_fab_rfm == FAB_C_VAR) | |
72 | #else | |
73 | # define STAT_SIZE_TOO_BIG(ST) 0 | |
74 | #endif | |
75 | ||
28e0f040 NB |
76 | /* The cmacro works like this: If it's NULL, the file is to be |
77 | included again. If it's NEVER_REREAD, the file is never to be | |
78 | included again. Otherwise it is a macro hashnode, and the file is | |
ba133c96 | 79 | to be included again if the macro is defined. */ |
dc65cd60 | 80 | #define NEVER_REREAD ((const cpp_hashnode *) -1) |
28e0f040 NB |
81 | #define DO_NOT_REREAD(inc) \ |
82 | ((inc)->cmacro && ((inc)->cmacro == NEVER_REREAD \ | |
ba133c96 | 83 | || (inc)->cmacro->type == NT_MACRO)) |
41947a54 | 84 | #define NO_INCLUDE_PATH ((struct include_file *) -1) |
17211ab5 | 85 | #define INCLUDE_PCH_P(F) (((F)->pch & 1) != 0) |
28e0f040 | 86 | |
6cf87ca4 ZW |
87 | static struct file_name_map *read_name_map (cpp_reader *, const char *); |
88 | static char *read_filename_string (int, FILE *); | |
89 | static char *remap_filename (cpp_reader *, char *, struct cpp_path *); | |
90 | static struct cpp_path *search_from (cpp_reader *, enum include_type); | |
91 | static struct include_file *find_include_file (cpp_reader *, const char *, | |
92 | int, enum include_type); | |
93 | static struct include_file *open_file (cpp_reader *, const char *); | |
94 | static struct include_file *validate_pch (cpp_reader *, const char *, | |
95 | const char *); | |
96 | static struct include_file *open_file_pch (cpp_reader *, const char *); | |
97 | static int read_include_file (cpp_reader *, struct include_file *); | |
98 | static bool stack_include_file (cpp_reader *, struct include_file *); | |
99 | static void purge_cache (struct include_file *); | |
100 | static void destroy_node (splay_tree_value); | |
101 | static int report_missing_guard (splay_tree_node, void *); | |
102 | static splay_tree_node find_or_create_entry (cpp_reader *, const char *); | |
103 | static void handle_missing_header (cpp_reader *, const char *, int); | |
104 | static int remove_component_p (const char *); | |
a36c54fa NB |
105 | |
106 | /* Set up the splay tree we use to store information about all the | |
107 | file names seen in this compilation. We also have entries for each | |
108 | file we tried to open but failed; this saves system calls since we | |
109 | don't try to open it again in future. | |
110 | ||
111 | The key of each node is the file name, after processing by | |
986b1f13 | 112 | cpp_simplify_path. The path name may or may not be absolute. |
a36c54fa NB |
113 | The path string has been malloced, as is automatically freed by |
114 | registering free () as the splay tree key deletion function. | |
115 | ||
116 | A node's value is a pointer to a struct include_file, and is never | |
117 | NULL. */ | |
d35364d1 | 118 | void |
6cf87ca4 | 119 | _cpp_init_includes (cpp_reader *pfile) |
d35364d1 ZW |
120 | { |
121 | pfile->all_include_files | |
c31a6508 ZW |
122 | = splay_tree_new ((splay_tree_compare_fn) strcmp, |
123 | (splay_tree_delete_key_fn) free, | |
a36c54fa | 124 | destroy_node); |
0b3d776a | 125 | } |
add7091b | 126 | |
a36c54fa | 127 | /* Tear down the splay tree. */ |
c71f835b | 128 | void |
6cf87ca4 | 129 | _cpp_cleanup_includes (cpp_reader *pfile) |
c71f835b ZW |
130 | { |
131 | splay_tree_delete (pfile->all_include_files); | |
132 | } | |
133 | ||
a36c54fa NB |
134 | /* Free a node. The path string is automatically freed. */ |
135 | static void | |
6cf87ca4 | 136 | destroy_node (splay_tree_value v) |
a36c54fa | 137 | { |
dc65cd60 | 138 | struct include_file *f = (struct include_file *) v; |
a36c54fa NB |
139 | |
140 | if (f) | |
141 | { | |
142 | purge_cache (f); | |
143 | free (f); | |
144 | } | |
145 | } | |
146 | ||
642ce434 NB |
147 | /* Mark a file to not be reread (e.g. #import, read failure). */ |
148 | void | |
6cf87ca4 | 149 | _cpp_never_reread (struct include_file *file) |
642ce434 NB |
150 | { |
151 | file->cmacro = NEVER_REREAD; | |
152 | } | |
153 | ||
ba133c96 | 154 | /* Lookup a filename, which is simplified after making a copy, and |
5793b276 | 155 | create an entry if none exists. */ |
a36c54fa | 156 | static splay_tree_node |
6cf87ca4 | 157 | find_or_create_entry (cpp_reader *pfile, const char *fname) |
d6d52dd6 | 158 | { |
a36c54fa NB |
159 | splay_tree_node node; |
160 | struct include_file *file; | |
ba133c96 | 161 | char *name = xstrdup (fname); |
6e270179 | 162 | int saved_errno; |
d6d52dd6 | 163 | |
986b1f13 | 164 | cpp_simplify_path (name); |
6e270179 | 165 | saved_errno = errno; |
ba133c96 NB |
166 | node = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) name); |
167 | if (node) | |
168 | free (name); | |
169 | else | |
d6d52dd6 | 170 | { |
a36c54fa | 171 | file = xcnew (struct include_file); |
ba133c96 | 172 | file->name = name; |
17211ab5 | 173 | file->header_name = name; |
6e270179 | 174 | file->err_no = saved_errno; |
a36c54fa NB |
175 | node = splay_tree_insert (pfile->all_include_files, |
176 | (splay_tree_key) file->name, | |
177 | (splay_tree_value) file); | |
d6d52dd6 | 178 | } |
a36c54fa NB |
179 | |
180 | return node; | |
181 | } | |
182 | ||
ba133c96 | 183 | /* Enter a file name in the splay tree, for the sake of cpp_included. */ |
a36c54fa | 184 | void |
6cf87ca4 | 185 | _cpp_fake_include (cpp_reader *pfile, const char *fname) |
a36c54fa NB |
186 | { |
187 | find_or_create_entry (pfile, fname); | |
d6d52dd6 NB |
188 | } |
189 | ||
a58d32c2 | 190 | /* Given a file name, look it up in the cache; if there is no entry, |
2047e26f NB |
191 | create one with a non-NULL value (regardless of success in opening |
192 | the file). If the file doesn't exist or is inaccessible, this | |
193 | entry is flagged so we don't attempt to open it again in the | |
373e2177 NB |
194 | future. If the file isn't open, open it. The empty string is |
195 | interpreted as stdin. | |
2047e26f NB |
196 | |
197 | Returns an include_file structure with an open file descriptor on | |
198 | success, or NULL on failure. */ | |
c31a6508 | 199 | static struct include_file * |
6cf87ca4 | 200 | open_file (cpp_reader *pfile, const char *filename) |
2047e26f | 201 | { |
a36c54fa NB |
202 | splay_tree_node nd = find_or_create_entry (pfile, filename); |
203 | struct include_file *file = (struct include_file *) nd->value; | |
add7091b | 204 | |
f277b5e0 NB |
205 | if (file->err_no) |
206 | { | |
207 | /* Ugh. handle_missing_header () needs errno to be set. */ | |
208 | errno = file->err_no; | |
209 | return 0; | |
210 | } | |
2047e26f | 211 | |
ec5c56db | 212 | /* Don't reopen an idempotent file. */ |
a36c54fa NB |
213 | if (DO_NOT_REREAD (file)) |
214 | return file; | |
df383483 | 215 | |
ec5c56db | 216 | /* Don't reopen one which is already loaded. */ |
26aea073 | 217 | if (0 && file->buffer != NULL) |
a36c54fa | 218 | return file; |
add7091b | 219 | |
c31a6508 ZW |
220 | /* We used to open files in nonblocking mode, but that caused more |
221 | problems than it solved. Do take care not to acquire a | |
222 | controlling terminal by mistake (this can't happen on sane | |
223 | systems, but paranoia is a virtue). | |
add7091b | 224 | |
c31a6508 ZW |
225 | Use the three-argument form of open even though we aren't |
226 | specifying O_CREAT, to defend against broken system headers. | |
add7091b | 227 | |
c31a6508 ZW |
228 | O_BINARY tells some runtime libraries (notably DJGPP) not to do |
229 | newline translation; we can handle DOS line breaks just fine | |
230 | ourselves. | |
b0699dad | 231 | |
c31a6508 | 232 | Special case: the empty string is translated to stdin. */ |
d4506961 | 233 | |
c31a6508 | 234 | if (filename[0] == '\0') |
85be8c2d AP |
235 | { |
236 | file->fd = 0; | |
237 | #ifdef __DJGPP__ | |
238 | /* For DJGPP redirected input is opened in text mode. Change it | |
239 | to binary mode. */ | |
240 | if (! isatty (file->fd)) | |
df383483 | 241 | setmode (file->fd, O_BINARY); |
85be8c2d AP |
242 | #endif |
243 | } | |
f2d5f0cc | 244 | else |
ba133c96 | 245 | file->fd = open (file->name, O_RDONLY | O_NOCTTY | O_BINARY, 0666); |
a58d32c2 | 246 | |
2047e26f NB |
247 | if (file->fd != -1 && fstat (file->fd, &file->st) == 0) |
248 | { | |
c0bfe993 NB |
249 | if (!S_ISDIR (file->st.st_mode)) |
250 | return file; | |
55485cd9 | 251 | |
7c092714 NB |
252 | /* If it's a directory, we return null and continue the search |
253 | as the file we're looking for may appear elsewhere in the | |
254 | search path. */ | |
c0bfe993 | 255 | errno = ENOENT; |
55485cd9 ZW |
256 | close (file->fd); |
257 | file->fd = -1; | |
2047e26f | 258 | } |
a58d32c2 | 259 | |
f277b5e0 | 260 | file->err_no = errno; |
a58d32c2 ZW |
261 | return 0; |
262 | } | |
263 | ||
17211ab5 | 264 | static struct include_file * |
6cf87ca4 | 265 | validate_pch (cpp_reader *pfile, const char *filename, const char *pchname) |
17211ab5 GK |
266 | { |
267 | struct include_file * file; | |
268 | ||
269 | file = open_file (pfile, pchname); | |
270 | if (file == NULL) | |
271 | return NULL; | |
272 | if ((file->pch & 2) == 0) | |
273 | file->pch = pfile->cb.valid_pch (pfile, pchname, file->fd); | |
79406520 GK |
274 | if (CPP_OPTION (pfile, print_include_names)) |
275 | { | |
276 | unsigned int i; | |
277 | for (i = 1; i < pfile->line_maps.depth; i++) | |
278 | putc ('.', stderr); | |
279 | fprintf (stderr, "%c %s\n", INCLUDE_PCH_P (file) ? '!' : 'x', pchname); | |
280 | } | |
17211ab5 GK |
281 | if (INCLUDE_PCH_P (file)) |
282 | { | |
5793b276 | 283 | char *f = xstrdup (filename); |
986b1f13 | 284 | cpp_simplify_path (f); |
5793b276 | 285 | file->header_name = f; |
17211ab5 GK |
286 | return file; |
287 | } | |
288 | close (file->fd); | |
289 | file->fd = -1; | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | ||
294 | /* Like open_file, but also look for a precompiled header if (a) one exists | |
295 | and (b) it is valid. */ | |
296 | static struct include_file * | |
6cf87ca4 | 297 | open_file_pch (cpp_reader *pfile, const char *filename) |
17211ab5 GK |
298 | { |
299 | if (filename[0] != '\0' | |
300 | && pfile->cb.valid_pch != NULL) | |
301 | { | |
302 | size_t namelen = strlen (filename); | |
303 | char *pchname = alloca (namelen + 5); | |
8d973a83 NB |
304 | struct include_file *file = NULL; |
305 | struct stat st; | |
17211ab5 GK |
306 | |
307 | memcpy (pchname, filename, namelen); | |
d8fad4ea | 308 | memcpy (pchname + namelen, ".gch", 5); |
8d973a83 | 309 | cpp_simplify_path (pchname); |
17211ab5 | 310 | |
8d973a83 | 311 | if (stat (pchname, &st) == 0 && S_ISDIR (st.st_mode)) |
17211ab5 | 312 | { |
8d973a83 NB |
313 | DIR * thedir; |
314 | struct dirent *d; | |
315 | size_t subname_len = namelen + 64; | |
316 | char *subname = xmalloc (subname_len); | |
17211ab5 | 317 | |
8d973a83 NB |
318 | thedir = opendir (pchname); |
319 | if (thedir == NULL) | |
320 | return NULL; | |
321 | memcpy (subname, pchname, namelen + 4); | |
322 | subname[namelen+4] = '/'; | |
323 | while ((d = readdir (thedir)) != NULL) | |
324 | { | |
325 | if (strlen (d->d_name) + namelen + 7 > subname_len) | |
17211ab5 | 326 | { |
8d973a83 NB |
327 | subname_len = strlen (d->d_name) + namelen + 64; |
328 | subname = xrealloc (subname, subname_len); | |
17211ab5 | 329 | } |
8d973a83 NB |
330 | strcpy (subname + namelen + 5, d->d_name); |
331 | file = validate_pch (pfile, filename, subname); | |
332 | if (file) | |
333 | break; | |
17211ab5 | 334 | } |
8d973a83 NB |
335 | closedir (thedir); |
336 | free (subname); | |
17211ab5 | 337 | } |
8d973a83 NB |
338 | else |
339 | file = validate_pch (pfile, filename, pchname); | |
340 | ||
341 | if (file) | |
342 | return file; | |
17211ab5 | 343 | } |
8d973a83 | 344 | |
17211ab5 GK |
345 | return open_file (pfile, filename); |
346 | } | |
347 | ||
e5eba70a NB |
348 | /* Place the file referenced by INC into a new buffer on the buffer |
349 | stack, unless there are errors, or the file is not re-included | |
350 | because of e.g. multiple-include guards. Returns true if a buffer | |
351 | is stacked. */ | |
e5eba70a | 352 | static bool |
6cf87ca4 | 353 | stack_include_file (cpp_reader *pfile, struct include_file *inc) |
a58d32c2 ZW |
354 | { |
355 | cpp_buffer *fp; | |
e5eba70a | 356 | int sysp; |
bb74c963 | 357 | const char *filename; |
51d0f328 | 358 | |
e5eba70a NB |
359 | if (DO_NOT_REREAD (inc)) |
360 | return false; | |
361 | ||
47d89cf3 | 362 | sysp = MAX ((pfile->map ? pfile->map->sysp : 0), |
11bca309 | 363 | (inc->foundhere ? inc->foundhere->sysp : 0)); |
51d0f328 | 364 | |
182d89a3 | 365 | /* Add the file to the dependencies on its first inclusion. */ |
f4ff5a69 | 366 | if (CPP_OPTION (pfile, deps.style) > !!sysp && !inc->include_count) |
182d89a3 NB |
367 | { |
368 | if (pfile->buffer || CPP_OPTION (pfile, deps.ignore_main_file) == 0) | |
369 | deps_add_dep (pfile->deps, inc->name); | |
370 | } | |
51d0f328 | 371 | |
17211ab5 GK |
372 | /* PCH files get dealt with immediately. */ |
373 | if (INCLUDE_PCH_P (inc)) | |
374 | { | |
375 | pfile->cb.read_pch (pfile, inc->name, inc->fd, inc->header_name); | |
376 | close (inc->fd); | |
377 | inc->fd = -1; | |
378 | return false; | |
379 | } | |
380 | ||
7c092714 | 381 | /* Not in cache? */ |
26aea073 | 382 | if (1 || ! inc->buffer) |
7c092714 | 383 | { |
4d6baafa | 384 | if (read_include_file (pfile, inc)) |
e5eba70a | 385 | { |
c0bfe993 | 386 | /* If an error occurs, do not try to read this file again. */ |
e5eba70a NB |
387 | _cpp_never_reread (inc); |
388 | return false; | |
389 | } | |
4d6baafa NB |
390 | /* Mark a regular, zero-length file never-reread. We read it, |
391 | NUL-terminate it, and stack it once, so preprocessing a main | |
392 | file of zero length does not raise an error. */ | |
393 | if (S_ISREG (inc->st.st_mode) && inc->st.st_size == 0) | |
394 | _cpp_never_reread (inc); | |
7c092714 NB |
395 | close (inc->fd); |
396 | inc->fd = -1; | |
397 | } | |
398 | ||
e5eba70a | 399 | if (pfile->buffer) |
5993019d NB |
400 | /* We don't want MI guard advice for the main file. */ |
401 | inc->include_count++; | |
eb1f4d9d NB |
402 | |
403 | /* Push a buffer. */ | |
29401c30 NB |
404 | fp = cpp_push_buffer (pfile, inc->buffer, inc->st.st_size, |
405 | /* from_stage3 */ CPP_OPTION (pfile, preprocessed), 0); | |
eb1f4d9d | 406 | fp->inc = inc; |
a58d32c2 | 407 | |
4912a07c | 408 | /* Initialize controlling macro state. */ |
6d18adbc | 409 | pfile->mi_valid = true; |
3cf3593f | 410 | pfile->mi_cmacro = 0; |
eb1f4d9d NB |
411 | |
412 | /* Generate the call back. */ | |
bb74c963 NB |
413 | filename = inc->name; |
414 | if (*filename == '\0') | |
0b264069 | 415 | filename = "<stdin>"; |
bb74c963 | 416 | _cpp_do_file_change (pfile, LC_ENTER, filename, 1, sysp); |
e5eba70a NB |
417 | |
418 | return true; | |
a58d32c2 ZW |
419 | } |
420 | ||
421 | /* Read the file referenced by INC into the file cache. | |
422 | ||
423 | If fd points to a plain file, we might be able to mmap it; we can | |
424 | definitely allocate the buffer all at once. If fd is a pipe or | |
425 | terminal, we can't do either. If fd is something weird, like a | |
7c092714 | 426 | block device, we don't want to read it at all. |
a58d32c2 ZW |
427 | |
428 | Unfortunately, different systems use different st.st_mode values | |
429 | for pipes: some have S_ISFIFO, some S_ISSOCK, some are buggy and | |
430 | zero the entire struct stat except a couple fields. Hence we don't | |
7c092714 NB |
431 | even try to figure out what something is, except for plain files |
432 | and block devices. | |
a58d32c2 ZW |
433 | |
434 | FIXME: Flush file cache and try again if we run out of memory. */ | |
7c092714 | 435 | static int |
6cf87ca4 | 436 | read_include_file (cpp_reader *pfile, struct include_file *inc) |
a58d32c2 ZW |
437 | { |
438 | ssize_t size, offset, count; | |
562a5c27 | 439 | uchar *buf; |
a58d32c2 ZW |
440 | |
441 | if (S_ISREG (inc->st.st_mode)) | |
f2d5f0cc | 442 | { |
a58d32c2 ZW |
443 | /* off_t might have a wider range than ssize_t - in other words, |
444 | the max size of a file might be bigger than the address | |
445 | space. We can't handle a file that large. (Anyone with | |
446 | a single source file bigger than 2GB needs to rethink | |
447 | their coding style.) Some systems (e.g. AIX 4.1) define | |
448 | SSIZE_MAX to be much smaller than the actual range of the | |
449 | type. Use INTTYPE_MAXIMUM unconditionally to ensure this | |
450 | does not bite us. */ | |
451 | if (inc->st.st_size > INTTYPE_MAXIMUM (ssize_t)) | |
f2d5f0cc | 452 | { |
ebef4e8c | 453 | cpp_error (pfile, DL_ERROR, "%s is too large", inc->name); |
a58d32c2 | 454 | goto fail; |
f2d5f0cc | 455 | } |
a58d32c2 ZW |
456 | size = inc->st.st_size; |
457 | ||
d4506961 | 458 | { |
703ad42b | 459 | buf = xmalloc (size + 1); |
a58d32c2 ZW |
460 | offset = 0; |
461 | while (offset < size) | |
462 | { | |
463 | count = read (inc->fd, buf + offset, size - offset); | |
464 | if (count < 0) | |
465 | goto perror_fail; | |
466 | if (count == 0) | |
467 | { | |
ae1139f9 | 468 | if (!STAT_SIZE_TOO_BIG (inc->st)) |
ebef4e8c NB |
469 | cpp_error (pfile, DL_WARNING, |
470 | "%s is shorter than expected", inc->name); | |
cdb29058 DR |
471 | size = offset; |
472 | buf = xrealloc (buf, size + 1); | |
473 | inc->st.st_size = size; | |
a58d32c2 ZW |
474 | break; |
475 | } | |
476 | offset += count; | |
477 | } | |
26aea073 NB |
478 | /* The lexer requires that the buffer be \n-terminated. */ |
479 | buf[size] = '\n'; | |
d4506961 | 480 | } |
a58d32c2 ZW |
481 | } |
482 | else if (S_ISBLK (inc->st.st_mode)) | |
483 | { | |
ebef4e8c | 484 | cpp_error (pfile, DL_ERROR, "%s is a block device", inc->name); |
a58d32c2 ZW |
485 | goto fail; |
486 | } | |
a58d32c2 ZW |
487 | else |
488 | { | |
489 | /* 8 kilobytes is a sensible starting size. It ought to be | |
490 | bigger than the kernel pipe buffer, and it's definitely | |
491 | bigger than the majority of C source files. */ | |
492 | size = 8 * 1024; | |
d4506961 | 493 | |
703ad42b | 494 | buf = xmalloc (size + 1); |
a58d32c2 ZW |
495 | offset = 0; |
496 | while ((count = read (inc->fd, buf + offset, size - offset)) > 0) | |
f2d5f0cc | 497 | { |
a58d32c2 ZW |
498 | offset += count; |
499 | if (offset == size) | |
4d6baafa NB |
500 | { |
501 | size *= 2; | |
502 | buf = xrealloc (buf, size + 1); | |
503 | } | |
f2d5f0cc | 504 | } |
a58d32c2 ZW |
505 | if (count < 0) |
506 | goto perror_fail; | |
507 | ||
4d6baafa NB |
508 | if (offset + 1 < size) |
509 | buf = xrealloc (buf, offset + 1); | |
510 | ||
26aea073 NB |
511 | /* The lexer requires that the buffer be \n-terminated. */ |
512 | buf[offset] = '\n'; | |
a58d32c2 | 513 | inc->st.st_size = offset; |
f2d5f0cc | 514 | } |
d7a2e0f7 | 515 | |
a58d32c2 | 516 | inc->buffer = buf; |
7c092714 | 517 | return 0; |
a58d32c2 ZW |
518 | |
519 | perror_fail: | |
ebef4e8c | 520 | cpp_errno (pfile, DL_ERROR, inc->name); |
a58d32c2 | 521 | fail: |
7c092714 | 522 | return 1; |
a58d32c2 ZW |
523 | } |
524 | ||
26aea073 | 525 | /* Drop INC's buffer from memory. */ |
a58d32c2 | 526 | static void |
6cf87ca4 | 527 | purge_cache (struct include_file *inc) |
a58d32c2 ZW |
528 | { |
529 | if (inc->buffer) | |
c31a6508 | 530 | { |
fad205ff | 531 | free ((void *) inc->buffer); |
a58d32c2 | 532 | inc->buffer = NULL; |
c31a6508 | 533 | } |
e576beb0 ZW |
534 | } |
535 | ||
c31a6508 ZW |
536 | /* Return 1 if the file named by FNAME has been included before in |
537 | any context, 0 otherwise. */ | |
538 | int | |
6cf87ca4 | 539 | cpp_included (cpp_reader *pfile, const char *fname) |
add7091b | 540 | { |
5793b276 | 541 | struct cpp_path *path; |
e7182666 | 542 | char *name, *n; |
c31a6508 | 543 | splay_tree_node nd; |
0b3d776a | 544 | |
3dce1408 | 545 | if (IS_ABSOLUTE_PATH (fname)) |
0b3d776a | 546 | { |
c31a6508 ZW |
547 | /* Just look it up. */ |
548 | nd = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) fname); | |
549 | return (nd && nd->value); | |
0b3d776a | 550 | } |
df383483 | 551 | |
c31a6508 | 552 | /* Search directory path for the file. */ |
703ad42b | 553 | name = alloca (strlen (fname) + pfile->max_include_len + 2); |
5793b276 | 554 | for (path = pfile->quote_include; path; path = path->next) |
0b3d776a | 555 | { |
591e15a1 NB |
556 | memcpy (name, path->name, path->len); |
557 | name[path->len] = '/'; | |
558 | strcpy (&name[path->len + 1], fname); | |
c31a6508 | 559 | if (CPP_OPTION (pfile, remap)) |
e7182666 NB |
560 | n = remap_filename (pfile, name, path); |
561 | else | |
ba133c96 | 562 | n = name; |
c31a6508 | 563 | |
e7182666 | 564 | nd = splay_tree_lookup (pfile->all_include_files, (splay_tree_key) n); |
c31a6508 ZW |
565 | if (nd && nd->value) |
566 | return 1; | |
0b3d776a | 567 | } |
c31a6508 | 568 | return 0; |
add7091b ZW |
569 | } |
570 | ||
74eb4b3e | 571 | /* Search for FNAME. Return 0 if there is no such file (or it's |
41947a54 NB |
572 | un-openable), in which case an error code will be in errno. If |
573 | there is no include path to use it returns NO_INCLUDE_PATH, | |
574 | otherwise an include_file structure. If this request originates | |
5d8ebbd8 | 575 | from a directive of TYPE #include_next, set INCLUDE_NEXT to true. */ |
c31a6508 | 576 | static struct include_file * |
6cf87ca4 ZW |
577 | find_include_file (cpp_reader *pfile, const char *fname, int angle_brackets, |
578 | enum include_type type) | |
f2d5f0cc | 579 | { |
5793b276 | 580 | struct cpp_path *path; |
c31a6508 | 581 | struct include_file *file; |
e7182666 | 582 | char *name, *n; |
add7091b | 583 | |
74eb4b3e NB |
584 | if (*fname == '\0') |
585 | { | |
586 | cpp_error (pfile, DL_ERROR, "empty file name"); | |
587 | return NO_INCLUDE_PATH; | |
588 | } | |
589 | ||
3dce1408 | 590 | if (IS_ABSOLUTE_PATH (fname)) |
17211ab5 | 591 | return open_file_pch (pfile, fname); |
41947a54 NB |
592 | |
593 | /* For #include_next, skip in the search path past the dir in which | |
e7182666 NB |
594 | the current file was found, but if it was found via an absolute |
595 | path use the normal search logic. */ | |
ba133c96 | 596 | if (type == IT_INCLUDE_NEXT && pfile->buffer->inc->foundhere) |
41947a54 | 597 | path = pfile->buffer->inc->foundhere->next; |
74eb4b3e | 598 | else if (angle_brackets) |
5793b276 | 599 | path = pfile->bracket_include; |
41947a54 | 600 | else |
ba133c96 | 601 | path = search_from (pfile, type); |
41947a54 NB |
602 | |
603 | if (path == NULL) | |
604 | { | |
ebef4e8c NB |
605 | cpp_error (pfile, DL_ERROR, "no include path in which to find %s", |
606 | fname); | |
41947a54 NB |
607 | return NO_INCLUDE_PATH; |
608 | } | |
609 | ||
c31a6508 | 610 | /* Search directory path for the file. */ |
703ad42b | 611 | name = alloca (strlen (fname) + pfile->max_include_len + 2); |
41947a54 | 612 | for (; path; path = path->next) |
add7091b | 613 | { |
55485cd9 ZW |
614 | int len = path->len; |
615 | memcpy (name, path->name, len); | |
616 | /* Don't turn / into // or // into ///; // may be a namespace | |
617 | escape. */ | |
618 | if (name[len-1] == '/') | |
619 | len--; | |
620 | name[len] = '/'; | |
621 | strcpy (&name[len + 1], fname); | |
c31a6508 | 622 | if (CPP_OPTION (pfile, remap)) |
e7182666 NB |
623 | n = remap_filename (pfile, name, path); |
624 | else | |
ba133c96 | 625 | n = name; |
c31a6508 | 626 | |
17211ab5 | 627 | file = open_file_pch (pfile, n); |
c31a6508 | 628 | if (file) |
add7091b | 629 | { |
c31a6508 ZW |
630 | file->foundhere = path; |
631 | return file; | |
add7091b ZW |
632 | } |
633 | } | |
591e15a1 | 634 | |
c31a6508 | 635 | return 0; |
add7091b ZW |
636 | } |
637 | ||
e605b040 | 638 | /* Not everyone who wants to set system-header-ness on a buffer can |
642ce434 NB |
639 | see the details of a buffer. This is an exported interface because |
640 | fix-header needs it. */ | |
e605b040 | 641 | void |
6cf87ca4 | 642 | cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc) |
e605b040 | 643 | { |
614c7d37 NB |
644 | int flags = 0; |
645 | ||
646 | /* 1 = system header, 2 = system header to be treated as C. */ | |
647 | if (syshdr) | |
648 | flags = 1 + (externc != 0); | |
47d89cf3 NB |
649 | _cpp_do_file_change (pfile, LC_RENAME, pfile->map->to_file, |
650 | SOURCE_LINE (pfile->map, pfile->line), flags); | |
e605b040 ZW |
651 | } |
652 | ||
b4e46cea PB |
653 | /* Allow the client to change the current file. Used by the front end |
654 | to achieve pseudo-file names like <built-in>. | |
655 | If REASON is LC_LEAVE, then NEW_NAME must be NULL. */ | |
c19b12cb | 656 | void |
6cf87ca4 ZW |
657 | cpp_change_file (cpp_reader *pfile, enum lc_reason reason, |
658 | const char *new_name) | |
c19b12cb | 659 | { |
b4e46cea | 660 | _cpp_do_file_change (pfile, reason, new_name, 1, 0); |
c19b12cb NB |
661 | } |
662 | ||
c71f835b ZW |
663 | /* Report on all files that might benefit from a multiple include guard. |
664 | Triggered by -H. */ | |
665 | void | |
6cf87ca4 | 666 | _cpp_report_missing_guards (cpp_reader *pfile) |
c71f835b ZW |
667 | { |
668 | int banner = 0; | |
fad205ff | 669 | splay_tree_foreach (pfile->all_include_files, report_missing_guard, &banner); |
c71f835b ZW |
670 | } |
671 | ||
5d8ebbd8 | 672 | /* Callback function for splay_tree_foreach(). */ |
c71f835b | 673 | static int |
6cf87ca4 | 674 | report_missing_guard (splay_tree_node n, void *b) |
c71f835b ZW |
675 | { |
676 | struct include_file *f = (struct include_file *) n->value; | |
dc65cd60 | 677 | int *bannerp = (int *) b; |
c71f835b ZW |
678 | |
679 | if (f && f->cmacro == 0 && f->include_count == 1) | |
680 | { | |
681 | if (*bannerp == 0) | |
682 | { | |
683 | fputs (_("Multiple include guards may be useful for:\n"), stderr); | |
684 | *bannerp = 1; | |
685 | } | |
686 | fputs (f->name, stderr); | |
687 | putc ('\n', stderr); | |
688 | } | |
689 | return 0; | |
690 | } | |
691 | ||
5d8ebbd8 | 692 | /* Create a dependency for file FNAME, or issue an error message as |
da7d8304 | 693 | appropriate. ANGLE_BRACKETS is nonzero if the file was bracketed |
5d8ebbd8 | 694 | like <..>. */ |
a36c54fa | 695 | static void |
6cf87ca4 ZW |
696 | handle_missing_header (cpp_reader *pfile, const char *fname, |
697 | int angle_brackets) | |
a36c54fa | 698 | { |
f4ff5a69 NB |
699 | bool print_dep |
700 | = CPP_OPTION (pfile, deps.style) > (angle_brackets || pfile->map->sysp); | |
dc65cd60 | 701 | |
f4ff5a69 | 702 | if (CPP_OPTION (pfile, deps.missing_files) && print_dep) |
3f8ffc7c | 703 | deps_add_dep (pfile->deps, fname); |
e7182666 NB |
704 | /* If -M was specified, then don't count this as an error, because |
705 | we can still produce correct output. Otherwise, we can't produce | |
706 | correct output, because there may be dependencies we need inside | |
707 | the missing file, and we don't know what directory this missing | |
ebef4e8c | 708 | file exists in. */ |
a36c54fa | 709 | else |
f4ff5a69 | 710 | cpp_errno (pfile, CPP_OPTION (pfile, deps.style) && ! print_dep |
ebef4e8c | 711 | ? DL_WARNING: DL_ERROR, fname); |
a36c54fa NB |
712 | } |
713 | ||
5d8ebbd8 NB |
714 | /* Handles #include-family directives (distinguished by TYPE), |
715 | including HEADER, and the command line -imacros and -include. | |
716 | Returns true if a buffer was stacked. */ | |
e5eba70a | 717 | bool |
6cf87ca4 ZW |
718 | _cpp_execute_include (cpp_reader *pfile, const char *fname, int angle_brackets, |
719 | enum include_type type) | |
168d3732 | 720 | { |
e5eba70a | 721 | bool stacked = false; |
74eb4b3e | 722 | struct include_file *inc; |
642ce434 | 723 | |
74eb4b3e | 724 | inc = find_include_file (pfile, fname, angle_brackets, type); |
41947a54 | 725 | if (inc == 0) |
74eb4b3e | 726 | handle_missing_header (pfile, fname, angle_brackets); |
41947a54 | 727 | else if (inc != NO_INCLUDE_PATH) |
168d3732 | 728 | { |
e5eba70a | 729 | stacked = stack_include_file (pfile, inc); |
51d0f328 | 730 | |
ba133c96 | 731 | if (type == IT_IMPORT) |
e7182666 | 732 | _cpp_never_reread (inc); |
168d3732 | 733 | } |
ba133c96 | 734 | |
e5eba70a | 735 | return stacked; |
168d3732 ZW |
736 | } |
737 | ||
41947a54 | 738 | /* Locate HEADER, and determine whether it is newer than the current |
48c4721e | 739 | file. If it cannot be located or dated, return -1, if it is |
41947a54 | 740 | newer, return 1, otherwise 0. */ |
f3f751ad | 741 | int |
6cf87ca4 ZW |
742 | _cpp_compare_file_date (cpp_reader *pfile, const char *fname, |
743 | int angle_brackets) | |
f3f751ad | 744 | { |
74eb4b3e | 745 | struct include_file *inc; |
df383483 | 746 | |
74eb4b3e | 747 | inc = find_include_file (pfile, fname, angle_brackets, IT_INCLUDE); |
41947a54 | 748 | if (inc == NULL || inc == NO_INCLUDE_PATH) |
f3f751ad | 749 | return -1; |
41947a54 | 750 | |
a58d32c2 | 751 | if (inc->fd > 0) |
f3f751ad | 752 | { |
f3f751ad NS |
753 | close (inc->fd); |
754 | inc->fd = -1; | |
755 | } | |
df383483 | 756 | |
41947a54 | 757 | return inc->st.st_mtime > pfile->buffer->inc->st.st_mtime; |
f3f751ad NS |
758 | } |
759 | ||
760 | ||
e5eba70a NB |
761 | /* Push an input buffer and load it up with the contents of FNAME. If |
762 | FNAME is "", read standard input. Return true if a buffer was | |
763 | stacked. */ | |
764 | bool | |
6cf87ca4 | 765 | _cpp_read_file (cpp_reader *pfile, const char *fname) |
c45da1ca | 766 | { |
17211ab5 GK |
767 | /* This uses open_file, because we don't allow a PCH to be used as |
768 | the toplevel compilation (that would prevent re-compiling an | |
769 | existing PCH without deleting it first). */ | |
373e2177 | 770 | struct include_file *f = open_file (pfile, fname); |
c45da1ca | 771 | |
041c3194 | 772 | if (f == NULL) |
c0bfe993 | 773 | { |
ebef4e8c | 774 | cpp_errno (pfile, DL_ERROR, fname); |
c0bfe993 NB |
775 | return false; |
776 | } | |
041c3194 | 777 | |
c0bfe993 | 778 | return stack_include_file (pfile, f); |
f8f769ea ZW |
779 | } |
780 | ||
c19b12cb NB |
781 | /* Pushes the given file onto the buffer stack. Returns nonzero if |
782 | successful. */ | |
783 | bool | |
6cf87ca4 | 784 | cpp_push_include (cpp_reader *pfile, const char *filename) |
c19b12cb | 785 | { |
c19b12cb NB |
786 | /* Make the command line directive take up a line. */ |
787 | pfile->line++; | |
74eb4b3e | 788 | return _cpp_execute_include (pfile, filename, false, IT_CMDLINE); |
c19b12cb NB |
789 | } |
790 | ||
5d8ebbd8 | 791 | /* Do appropriate cleanup when a file INC's buffer is popped off the |
af0d16cd NB |
792 | input stack. */ |
793 | void | |
6cf87ca4 | 794 | _cpp_pop_file_buffer (cpp_reader *pfile, struct include_file *inc) |
f9a0e96c | 795 | { |
ba133c96 | 796 | /* Record the inclusion-preventing macro, which could be NULL |
6d18adbc NB |
797 | meaning no controlling macro. */ |
798 | if (pfile->mi_valid && inc->cmacro == NULL) | |
ba133c96 | 799 | inc->cmacro = pfile->mi_cmacro; |
93c80368 NB |
800 | |
801 | /* Invalidate control macros in the #including file. */ | |
6d18adbc | 802 | pfile->mi_valid = false; |
f9a0e96c | 803 | |
26aea073 | 804 | purge_cache (inc); |
f9a0e96c ZW |
805 | } |
806 | ||
591e15a1 NB |
807 | /* Returns the first place in the include chain to start searching for |
808 | "" includes. This involves stripping away the basename of the | |
ba133c96 NB |
809 | current file, unless -I- was specified. |
810 | ||
811 | If we're handling -include or -imacros, use the "" chain, but with | |
812 | the preprocessor's cwd prepended. */ | |
5793b276 | 813 | static struct cpp_path * |
6cf87ca4 | 814 | search_from (cpp_reader *pfile, enum include_type type) |
591e15a1 NB |
815 | { |
816 | cpp_buffer *buffer = pfile->buffer; | |
817 | unsigned int dlen; | |
818 | ||
ba133c96 NB |
819 | /* Command line uses the cwd, and does not cache the result. */ |
820 | if (type == IT_CMDLINE) | |
821 | goto use_cwd; | |
822 | ||
5793b276 NB |
823 | /* Ignore the current file's directory? */ |
824 | if (pfile->quote_ignores_source_dir) | |
825 | return pfile->quote_include; | |
591e15a1 | 826 | |
ba133c96 | 827 | if (! buffer->search_cached) |
591e15a1 | 828 | { |
ba133c96 | 829 | buffer->search_cached = 1; |
591e15a1 | 830 | |
ba133c96 | 831 | dlen = lbasename (buffer->inc->name) - buffer->inc->name; |
591e15a1 | 832 | |
ba133c96 NB |
833 | if (dlen) |
834 | { | |
835 | /* We don't guarantee NAME is null-terminated. This saves | |
29401c30 | 836 | allocating and freeing memory. Drop a trailing '/'. */ |
5793b276 | 837 | buffer->dir.name = (char *) buffer->inc->name; |
ba133c96 NB |
838 | if (dlen > 1) |
839 | dlen--; | |
840 | } | |
841 | else | |
842 | { | |
843 | use_cwd: | |
5793b276 | 844 | buffer->dir.name = (char *) "."; |
ba133c96 NB |
845 | dlen = 1; |
846 | } | |
847 | ||
848 | if (dlen > pfile->max_include_len) | |
849 | pfile->max_include_len = dlen; | |
850 | ||
851 | buffer->dir.len = dlen; | |
5793b276 | 852 | buffer->dir.next = pfile->quote_include; |
47d89cf3 | 853 | buffer->dir.sysp = pfile->map->sysp; |
ba133c96 | 854 | } |
591e15a1 NB |
855 | |
856 | return &buffer->dir; | |
857 | } | |
858 | ||
c31a6508 ZW |
859 | /* The file_name_map structure holds a mapping of file names for a |
860 | particular directory. This mapping is read from the file named | |
861 | FILE_NAME_MAP_FILE in that directory. Such a file can be used to | |
862 | map filenames on a file system with severe filename restrictions, | |
863 | such as DOS. The format of the file name map file is just a series | |
864 | of lines with two tokens on each line. The first token is the name | |
865 | to map, and the second token is the actual name to use. */ | |
dc65cd60 | 866 | struct file_name_map { |
c31a6508 ZW |
867 | struct file_name_map *map_next; |
868 | char *map_from; | |
869 | char *map_to; | |
870 | }; | |
871 | ||
872 | #define FILE_NAME_MAP_FILE "header.gcc" | |
873 | ||
874 | /* Read a space delimited string of unlimited length from a stdio | |
5d8ebbd8 | 875 | file F. */ |
c31a6508 | 876 | static char * |
6cf87ca4 | 877 | read_filename_string (int ch, FILE *f) |
c31a6508 ZW |
878 | { |
879 | char *alloc, *set; | |
880 | int len; | |
881 | ||
882 | len = 20; | |
883 | set = alloc = xmalloc (len + 1); | |
dc65cd60 | 884 | if (! is_space (ch)) |
c31a6508 ZW |
885 | { |
886 | *set++ = ch; | |
dc65cd60 | 887 | while ((ch = getc (f)) != EOF && ! is_space (ch)) |
c31a6508 ZW |
888 | { |
889 | if (set - alloc == len) | |
890 | { | |
891 | len *= 2; | |
892 | alloc = xrealloc (alloc, len + 1); | |
893 | set = alloc + len / 2; | |
894 | } | |
895 | *set++ = ch; | |
896 | } | |
897 | } | |
898 | *set = '\0'; | |
899 | ungetc (ch, f); | |
900 | return alloc; | |
901 | } | |
902 | ||
903 | /* This structure holds a linked list of file name maps, one per directory. */ | |
dc65cd60 | 904 | struct file_name_map_list { |
c31a6508 ZW |
905 | struct file_name_map_list *map_list_next; |
906 | char *map_list_name; | |
907 | struct file_name_map *map_list_map; | |
908 | }; | |
909 | ||
910 | /* Read the file name map file for DIRNAME. */ | |
c31a6508 | 911 | static struct file_name_map * |
6cf87ca4 | 912 | read_name_map (cpp_reader *pfile, const char *dirname) |
c31a6508 | 913 | { |
b3694847 | 914 | struct file_name_map_list *map_list_ptr; |
c31a6508 ZW |
915 | char *name; |
916 | FILE *f; | |
917 | ||
8767c894 | 918 | /* Check the cache of directories, and mappings in their remap file. */ |
c31a6508 ZW |
919 | for (map_list_ptr = CPP_OPTION (pfile, map_list); map_list_ptr; |
920 | map_list_ptr = map_list_ptr->map_list_next) | |
921 | if (! strcmp (map_list_ptr->map_list_name, dirname)) | |
922 | return map_list_ptr->map_list_map; | |
923 | ||
703ad42b | 924 | map_list_ptr = xmalloc (sizeof (struct file_name_map_list)); |
c31a6508 | 925 | map_list_ptr->map_list_name = xstrdup (dirname); |
8767c894 NB |
926 | |
927 | /* The end of the list ends in NULL. */ | |
4b588241 | 928 | map_list_ptr->map_list_map = NULL; |
c31a6508 | 929 | |
703ad42b | 930 | name = alloca (strlen (dirname) + strlen (FILE_NAME_MAP_FILE) + 2); |
c31a6508 ZW |
931 | strcpy (name, dirname); |
932 | if (*dirname) | |
933 | strcat (name, "/"); | |
934 | strcat (name, FILE_NAME_MAP_FILE); | |
935 | f = fopen (name, "r"); | |
8767c894 NB |
936 | |
937 | /* Silently return NULL if we cannot open. */ | |
938 | if (f) | |
c31a6508 ZW |
939 | { |
940 | int ch; | |
c31a6508 ZW |
941 | |
942 | while ((ch = getc (f)) != EOF) | |
943 | { | |
944 | char *from, *to; | |
945 | struct file_name_map *ptr; | |
946 | ||
dc65cd60 | 947 | if (is_space (ch)) |
c31a6508 ZW |
948 | continue; |
949 | from = read_filename_string (ch, f); | |
dc65cd60 | 950 | while ((ch = getc (f)) != EOF && is_hspace (ch)) |
c31a6508 ZW |
951 | ; |
952 | to = read_filename_string (ch, f); | |
953 | ||
703ad42b | 954 | ptr = xmalloc (sizeof (struct file_name_map)); |
c31a6508 ZW |
955 | ptr->map_from = from; |
956 | ||
957 | /* Make the real filename absolute. */ | |
3dce1408 | 958 | if (IS_ABSOLUTE_PATH (to)) |
c31a6508 ZW |
959 | ptr->map_to = to; |
960 | else | |
961 | { | |
1dcd444b | 962 | ptr->map_to = concat (dirname, "/", to, NULL); |
c31a6508 | 963 | free (to); |
df383483 | 964 | } |
c31a6508 ZW |
965 | |
966 | ptr->map_next = map_list_ptr->map_list_map; | |
967 | map_list_ptr->map_list_map = ptr; | |
968 | ||
969 | while ((ch = getc (f)) != '\n') | |
970 | if (ch == EOF) | |
971 | break; | |
972 | } | |
973 | fclose (f); | |
974 | } | |
df383483 | 975 | |
8767c894 | 976 | /* Add this information to the cache. */ |
c31a6508 ZW |
977 | map_list_ptr->map_list_next = CPP_OPTION (pfile, map_list); |
978 | CPP_OPTION (pfile, map_list) = map_list_ptr; | |
979 | ||
980 | return map_list_ptr->map_list_map; | |
df383483 | 981 | } |
c31a6508 | 982 | |
e7182666 NB |
983 | /* Remap an unsimplified path NAME based on the file_name_map (if any) |
984 | for LOC. */ | |
c31a6508 | 985 | static char * |
6cf87ca4 | 986 | remap_filename (cpp_reader *pfile, char *name, struct cpp_path *loc) |
c31a6508 ZW |
987 | { |
988 | struct file_name_map *map; | |
8767c894 | 989 | const char *from, *p; |
e7182666 | 990 | char *dir; |
c31a6508 ZW |
991 | |
992 | if (! loc->name_map) | |
8767c894 | 993 | { |
e7182666 NB |
994 | /* Get a null-terminated path. */ |
995 | char *dname = alloca (loc->len + 1); | |
996 | memcpy (dname, loc->name, loc->len); | |
997 | dname[loc->len] = '\0'; | |
998 | ||
591e15a1 | 999 | loc->name_map = read_name_map (pfile, dname); |
8767c894 NB |
1000 | if (! loc->name_map) |
1001 | return name; | |
1002 | } | |
df383483 | 1003 | |
e7182666 | 1004 | /* This works since NAME has not been simplified yet. */ |
591e15a1 | 1005 | from = name + loc->len + 1; |
df383483 | 1006 | |
c31a6508 ZW |
1007 | for (map = loc->name_map; map; map = map->map_next) |
1008 | if (!strcmp (map->map_from, from)) | |
1009 | return map->map_to; | |
1010 | ||
1011 | /* Try to find a mapping file for the particular directory we are | |
1012 | looking in. Thus #include <sys/types.h> will look up sys/types.h | |
1013 | in /usr/include/header.gcc and look up types.h in | |
1014 | /usr/include/sys/header.gcc. */ | |
1015 | p = strrchr (name, '/'); | |
1016 | if (!p) | |
c31a6508 ZW |
1017 | return name; |
1018 | ||
8767c894 | 1019 | /* We know p != name as absolute paths don't call remap_filename. */ |
c31a6508 | 1020 | if (p == name) |
ebef4e8c | 1021 | cpp_error (pfile, DL_ICE, "absolute file name in remap_filename"); |
8767c894 | 1022 | |
703ad42b | 1023 | dir = alloca (p - name + 1); |
8767c894 NB |
1024 | memcpy (dir, name, p - name); |
1025 | dir[p - name] = '\0'; | |
1026 | from = p + 1; | |
df383483 | 1027 | |
c31a6508 | 1028 | for (map = read_name_map (pfile, dir); map; map = map->map_next) |
8767c894 | 1029 | if (! strcmp (map->map_from, from)) |
c31a6508 ZW |
1030 | return map->map_to; |
1031 | ||
1032 | return name; | |
1033 | } | |
1034 | ||
5793b276 NB |
1035 | /* Set the include chain for "" to QUOTE, for <> to BRACKET. If |
1036 | QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the | |
1037 | directory of the including file. | |
f9200da2 | 1038 | |
5793b276 NB |
1039 | If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */ |
1040 | void | |
6cf87ca4 ZW |
1041 | cpp_set_include_chains (cpp_reader *pfile, cpp_path *quote, cpp_path *bracket, |
1042 | int quote_ignores_source_dir) | |
0b3d776a | 1043 | { |
5793b276 NB |
1044 | pfile->quote_include = quote; |
1045 | pfile->bracket_include = quote; | |
1046 | pfile->quote_ignores_source_dir = quote_ignores_source_dir; | |
1047 | pfile->max_include_len = 0; | |
df383483 | 1048 | |
5793b276 | 1049 | for (; quote; quote = quote->next) |
0b3d776a | 1050 | { |
5793b276 NB |
1051 | quote->name_map = NULL; |
1052 | quote->len = strlen (quote->name); | |
1053 | if (quote->len > pfile->max_include_len) | |
1054 | pfile->max_include_len = quote->len; | |
1055 | if (quote == bracket) | |
1056 | pfile->bracket_include = bracket; | |
0b3d776a | 1057 | } |
0b3d776a | 1058 | } |
986b1f13 NB |
1059 | |
1060 | /* Returns true if it is safe to remove the final component of path, | |
1061 | when it is followed by a ".." component. We use lstat to avoid | |
1062 | symlinks if we have it. If not, we can still catch errors with | |
1063 | stat (). */ | |
1064 | static int | |
6cf87ca4 | 1065 | remove_component_p (const char *path) |
986b1f13 NB |
1066 | { |
1067 | struct stat s; | |
1068 | int result; | |
1069 | ||
1070 | #ifdef HAVE_LSTAT | |
1071 | result = lstat (path, &s); | |
1072 | #else | |
1073 | result = stat (path, &s); | |
1074 | #endif | |
1075 | ||
1076 | /* There's no guarantee that errno will be unchanged, even on | |
1077 | success. Cygwin's lstat(), for example, will often set errno to | |
1078 | ENOSYS. In case of success, reset errno to zero. */ | |
1079 | if (result == 0) | |
1080 | errno = 0; | |
1081 | ||
1082 | return result == 0 && S_ISDIR (s.st_mode); | |
1083 | } | |
1084 | ||
1085 | /* Simplify a path name in place, deleting redundant components. This | |
1086 | reduces OS overhead and guarantees that equivalent paths compare | |
1087 | the same (modulo symlinks). | |
1088 | ||
1089 | Transforms made: | |
1090 | foo/bar/../quux foo/quux | |
1091 | foo/./bar foo/bar | |
1092 | foo//bar foo/bar | |
1093 | /../quux /quux | |
1094 | //quux //quux (POSIX allows leading // as a namespace escape) | |
1095 | ||
1096 | Guarantees no trailing slashes. All transforms reduce the length | |
1097 | of the string. Returns PATH. errno is 0 if no error occurred; | |
1098 | nonzero if an error occurred when using stat () or lstat (). */ | |
1099 | void | |
6cf87ca4 | 1100 | cpp_simplify_path (char *path ATTRIBUTE_UNUSED) |
986b1f13 NB |
1101 | { |
1102 | #ifndef VMS | |
1103 | char *from, *to; | |
1104 | char *base, *orig_base; | |
1105 | int absolute = 0; | |
1106 | ||
1107 | errno = 0; | |
1108 | /* Don't overflow the empty path by putting a '.' in it below. */ | |
1109 | if (*path == '\0') | |
1110 | return; | |
1111 | ||
1112 | #if defined (HAVE_DOS_BASED_FILE_SYSTEM) | |
1113 | /* Convert all backslashes to slashes. */ | |
1114 | for (from = path; *from; from++) | |
1115 | if (*from == '\\') *from = '/'; | |
1116 | ||
1117 | /* Skip over leading drive letter if present. */ | |
1118 | if (ISALPHA (path[0]) && path[1] == ':') | |
1119 | from = to = &path[2]; | |
1120 | else | |
1121 | from = to = path; | |
1122 | #else | |
1123 | from = to = path; | |
1124 | #endif | |
1125 | ||
1126 | /* Remove redundant leading /s. */ | |
1127 | if (*from == '/') | |
1128 | { | |
1129 | absolute = 1; | |
1130 | to++; | |
1131 | from++; | |
1132 | if (*from == '/') | |
1133 | { | |
1134 | if (*++from == '/') | |
1135 | /* 3 or more initial /s are equivalent to 1 /. */ | |
1136 | while (*++from == '/'); | |
1137 | else | |
1138 | /* On some hosts // differs from /; Posix allows this. */ | |
1139 | to++; | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | base = orig_base = to; | |
1144 | for (;;) | |
1145 | { | |
1146 | int move_base = 0; | |
1147 | ||
1148 | while (*from == '/') | |
1149 | from++; | |
1150 | ||
1151 | if (*from == '\0') | |
1152 | break; | |
1153 | ||
1154 | if (*from == '.') | |
1155 | { | |
1156 | if (from[1] == '\0') | |
1157 | break; | |
1158 | if (from[1] == '/') | |
1159 | { | |
1160 | from += 2; | |
1161 | continue; | |
1162 | } | |
1163 | else if (from[1] == '.' && (from[2] == '/' || from[2] == '\0')) | |
1164 | { | |
1165 | /* Don't simplify if there was no previous component. */ | |
1166 | if (absolute && orig_base == to) | |
1167 | { | |
1168 | from += 2; | |
1169 | continue; | |
1170 | } | |
1171 | /* Don't simplify if the previous component was "../", | |
1172 | or if an error has already occurred with (l)stat. */ | |
1173 | if (base != to && errno == 0) | |
1174 | { | |
1175 | /* We don't back up if it's a symlink. */ | |
1176 | *to = '\0'; | |
1177 | if (remove_component_p (path)) | |
1178 | { | |
1179 | while (to > base && *to != '/') | |
1180 | to--; | |
1181 | from += 2; | |
1182 | continue; | |
1183 | } | |
1184 | } | |
1185 | move_base = 1; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | /* Add the component separator. */ | |
1190 | if (to > orig_base) | |
1191 | *to++ = '/'; | |
1192 | ||
1193 | /* Copy this component until the trailing null or '/'. */ | |
1194 | while (*from != '\0' && *from != '/') | |
1195 | *to++ = *from++; | |
1196 | ||
1197 | if (move_base) | |
1198 | base = to; | |
1199 | } | |
1200 | ||
1201 | /* Change the empty string to "." so that it is not treated as stdin. | |
1202 | Null terminate. */ | |
1203 | if (to == path) | |
1204 | *to++ = '.'; | |
1205 | *to = '\0'; | |
1206 | #else /* VMS */ | |
1207 | errno = 0; | |
1208 | #endif /* !VMS */ | |
1209 | } |