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Commit | Line | Data |
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8f9b4009 | 1 | /* Part of CPP library. 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 | |
8f9b4009 | 8 | Reimplemented, Neil Booth, Jul 2003 |
add7091b ZW |
9 | |
10 | This program is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU General Public License as published by the | |
12 | Free Software Foundation; either version 2, or (at your option) any | |
13 | later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
e38992e8 | 22 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
add7091b ZW |
23 | |
24 | #include "config.h" | |
25 | #include "system.h" | |
add7091b | 26 | #include "cpplib.h" |
88ae23e7 | 27 | #include "cpphash.h" |
c1212d2f | 28 | #include "intl.h" |
168d3732 | 29 | #include "mkdeps.h" |
bf42e45b | 30 | #include "hashtab.h" |
8f9b4009 | 31 | #include <dirent.h> |
f8f769ea | 32 | |
8f9b4009 NB |
33 | /* Variable length record files on VMS will have a stat size that includes |
34 | record control characters that won't be included in the read size. */ | |
35 | #ifdef VMS | |
36 | # define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */ | |
37 | # define STAT_SIZE_RELIABLE(ST) ((ST).st_fab_rfm != FAB_C_VAR) | |
38 | #else | |
39 | # define STAT_SIZE_RELIABLE(ST) true | |
d7a2e0f7 ZW |
40 | #endif |
41 | ||
8f9b4009 NB |
42 | #ifdef __DJGPP__ |
43 | /* For DJGPP redirected input is opened in text mode. */ | |
44 | # define set_stdin_to_binary_mode() \ | |
45 | if (! isatty (0)) setmode (0, O_BINARY) | |
46 | #else | |
47 | # define set_stdin_to_binary_mode() /* Nothing */ | |
48 | #endif | |
49 | ||
50 | #ifndef O_BINARY | |
51 | # define O_BINARY 0 | |
a58d32c2 | 52 | #endif |
a58d32c2 | 53 | |
8f9b4009 NB |
54 | /* This structure represents a file searched for by CPP, whether it |
55 | exists or not. An instance may be pointed to by more than one | |
56 | file_hash_entry; at present no reference count is kept. */ | |
8f9b4009 NB |
57 | struct _cpp_file |
58 | { | |
59 | /* Filename as given to #include or command line switch. */ | |
60 | const char *name; | |
642ce434 | 61 | |
8f9b4009 NB |
62 | /* The full path used to find the file. */ |
63 | const char *path; | |
ae1139f9 | 64 | |
8f9b4009 NB |
65 | /* The full path of the pch file. */ |
66 | const char *pchname; | |
add7091b | 67 | |
bf42e45b NB |
68 | /* The file's path with the basename stripped. NULL if it hasn't |
69 | been calculated yet. */ | |
8f9b4009 | 70 | const char *dir_name; |
c71f835b | 71 | |
49634b3a NB |
72 | /* Chain through all files. */ |
73 | struct _cpp_file *next_file; | |
a36c54fa | 74 | |
8f9b4009 NB |
75 | /* The contents of NAME after calling read_file(). */ |
76 | const uchar *buffer; | |
a36c54fa | 77 | |
8f9b4009 NB |
78 | /* The macro, if any, preventing re-inclusion. */ |
79 | const cpp_hashnode *cmacro; | |
642ce434 | 80 | |
8f9b4009 NB |
81 | /* The directory in the search path where FILE was found. Used for |
82 | #include_next and determining whether a header is a system | |
bf42e45b | 83 | header. */ |
8f9b4009 | 84 | cpp_dir *dir; |
a36c54fa | 85 | |
8f9b4009 NB |
86 | /* As filled in by stat(2) for the file. */ |
87 | struct stat st; | |
a36c54fa | 88 | |
8f9b4009 NB |
89 | /* File descriptor. Invalid if -1, otherwise open. */ |
90 | int fd; | |
d6d52dd6 | 91 | |
8f9b4009 NB |
92 | /* Zero if this file was successfully opened and stat()-ed, |
93 | otherwise errno obtained from failure. */ | |
94 | int err_no; | |
add7091b | 95 | |
8f9b4009 NB |
96 | /* Number of times the file has been stacked for preprocessing. */ |
97 | unsigned short stack_count; | |
2047e26f | 98 | |
49634b3a NB |
99 | /* If opened with #import or contains #pragma once. */ |
100 | bool once_only; | |
add7091b | 101 | |
8f9b4009 NB |
102 | /* If read() failed before. */ |
103 | bool dont_read; | |
add7091b | 104 | |
8f9b4009 NB |
105 | /* If this file is the main file. */ |
106 | bool main_file; | |
add7091b | 107 | |
8f9b4009 NB |
108 | /* If BUFFER above contains the true contents of the file. */ |
109 | bool buffer_valid; | |
b0699dad | 110 | |
8f9b4009 NB |
111 | /* 0: file not known to be a PCH. |
112 | 1: file is a PCH (on return from find_include_file). | |
113 | 2: file is not and never will be a valid precompiled header. | |
114 | 3: file is always a valid precompiled header. */ | |
115 | uchar pch; | |
116 | }; | |
d4506961 | 117 | |
8f9b4009 NB |
118 | /* A singly-linked list for all searches for a given file name, with |
119 | its head pointed to by a slot in FILE_HASH. The file name is what | |
120 | appeared between the quotes in a #include directive; it can be | |
a98ebe2e | 121 | determined implicitly from the hash table location or explicitly |
bf42e45b | 122 | from FILE->name. |
8f9b4009 NB |
123 | |
124 | FILE is a structure containing details about the file that was | |
125 | found with that search, or details of how the search failed. | |
126 | ||
127 | START_DIR is the starting location of the search in the include | |
128 | chain. The current directories for "" includes are also hashed in | |
bf42e45b NB |
129 | the hash table and therefore unique. Files that are looked up |
130 | without using a search path, such as absolute filenames and file | |
131 | names from the command line share a special starting directory so | |
132 | they don't cause cache hits with normal include-chain lookups. | |
8f9b4009 NB |
133 | |
134 | If START_DIR is NULL then the entry is for a directory, not a file, | |
135 | and the directory is in DIR. Since the starting point in a file | |
136 | lookup chain is never NULL, this means that simple pointer | |
137 | comparisons against START_DIR can be made to determine cache hits | |
138 | in file lookups. | |
bf42e45b NB |
139 | |
140 | If a cache lookup fails because of e.g. an extra "./" in the path, | |
141 | then nothing will break. It is just less efficient as CPP will | |
142 | have to do more work re-preprocessing the file, and/or comparing | |
143 | its contents against earlier once-only files. | |
8f9b4009 NB |
144 | */ |
145 | struct file_hash_entry | |
146 | { | |
147 | struct file_hash_entry *next; | |
148 | cpp_dir *start_dir; | |
149 | union | |
150 | { | |
151 | _cpp_file *file; | |
152 | cpp_dir *dir; | |
153 | } u; | |
154 | }; | |
155 | ||
156 | static bool open_file (_cpp_file *file); | |
3d67ba1e GK |
157 | static bool pch_open_file (cpp_reader *pfile, _cpp_file *file, |
158 | bool *invalid_pch); | |
159 | static bool find_file_in_dir (cpp_reader *pfile, _cpp_file *file, | |
160 | bool *invalid_pch); | |
8f9b4009 NB |
161 | static bool read_file_guts (cpp_reader *pfile, _cpp_file *file); |
162 | static bool read_file (cpp_reader *pfile, _cpp_file *file); | |
cf1ee30c | 163 | static bool should_stack_file (cpp_reader *, _cpp_file *file, bool import); |
8f9b4009 NB |
164 | static struct cpp_dir *search_path_head (cpp_reader *, const char *fname, |
165 | int angle_brackets, enum include_type); | |
166 | static const char *dir_name_of_file (_cpp_file *file); | |
167 | static void open_file_failed (cpp_reader *pfile, _cpp_file *file); | |
168 | static struct file_hash_entry *search_cache (struct file_hash_entry *head, | |
169 | const cpp_dir *start_dir); | |
170 | static _cpp_file *make_cpp_file (cpp_reader *, cpp_dir *, const char *fname); | |
171 | static cpp_dir *make_cpp_dir (cpp_reader *, const char *dir_name, int sysp); | |
172 | static void allocate_file_hash_entries (cpp_reader *pfile); | |
173 | static struct file_hash_entry *new_file_hash_entry (cpp_reader *pfile); | |
174 | static int report_missing_guard (void **slot, void *b); | |
b92be669 PB |
175 | static hashval_t file_hash_hash (const void *p); |
176 | static int file_hash_eq (const void *p, const void *q); | |
8f9b4009 NB |
177 | static char *read_filename_string (int ch, FILE *f); |
178 | static void read_name_map (cpp_dir *dir); | |
179 | static char *remap_filename (cpp_reader *pfile, _cpp_file *file); | |
180 | static char *append_file_to_dir (const char *fname, cpp_dir *dir); | |
181 | static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname); | |
182 | static bool include_pch_p (_cpp_file *file); | |
183 | ||
184 | /* Given a filename in FILE->PATH, with the empty string interpreted | |
185 | as <stdin>, open it. | |
186 | ||
187 | On success FILE contains an open file descriptor and stat | |
188 | information for the file. On failure the file descriptor is -1 and | |
189 | the appropriate errno is also stored in FILE. Returns TRUE iff | |
190 | successful. | |
191 | ||
192 | We used to open files in nonblocking mode, but that caused more | |
193 | problems than it solved. Do take care not to acquire a controlling | |
194 | terminal by mistake (this can't happen on sane systems, but | |
195 | paranoia is a virtue). | |
196 | ||
197 | Use the three-argument form of open even though we aren't | |
198 | specifying O_CREAT, to defend against broken system headers. | |
199 | ||
200 | O_BINARY tells some runtime libraries (notably DJGPP) not to do | |
201 | newline translation; we can handle DOS line breaks just fine | |
202 | ourselves. */ | |
203 | static bool | |
204 | open_file (_cpp_file *file) | |
205 | { | |
206 | if (file->path[0] == '\0') | |
85be8c2d AP |
207 | { |
208 | file->fd = 0; | |
8f9b4009 | 209 | set_stdin_to_binary_mode (); |
85be8c2d | 210 | } |
f2d5f0cc | 211 | else |
8f9b4009 | 212 | file->fd = open (file->path, O_RDONLY | O_NOCTTY | O_BINARY, 0666); |
a58d32c2 | 213 | |
8f9b4009 | 214 | if (file->fd != -1) |
2047e26f | 215 | { |
8f9b4009 NB |
216 | if (fstat (file->fd, &file->st) == 0) |
217 | { | |
218 | if (!S_ISDIR (file->st.st_mode)) | |
219 | { | |
220 | file->err_no = 0; | |
221 | return true; | |
222 | } | |
223 | ||
224 | /* Ignore a directory and continue the search. The file we're | |
225 | looking for may be elsewhere in the search path. */ | |
226 | errno = ENOENT; | |
227 | } | |
55485cd9 | 228 | |
55485cd9 ZW |
229 | close (file->fd); |
230 | file->fd = -1; | |
2047e26f | 231 | } |
a54c550f NB |
232 | else if (errno == ENOTDIR) |
233 | errno = ENOENT; | |
a58d32c2 | 234 | |
f277b5e0 | 235 | file->err_no = errno; |
8f9b4009 NB |
236 | |
237 | return false; | |
a58d32c2 ZW |
238 | } |
239 | ||
3d67ba1e GK |
240 | /* Temporary PCH intercept of opening a file. Try to find a PCH file |
241 | based on FILE->name and FILE->dir, and test those found for | |
242 | validity using PFILE->cb.valid_pch. Return true iff a valid file is | |
243 | found. Set *INVALID_PCH if a PCH file is found but wasn't valid. */ | |
244 | ||
8f9b4009 | 245 | static bool |
3d67ba1e | 246 | pch_open_file (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) |
17211ab5 | 247 | { |
8f9b4009 NB |
248 | static const char extension[] = ".gch"; |
249 | const char *path = file->path; | |
250 | size_t len, flen; | |
251 | char *pchname; | |
252 | struct stat st; | |
253 | bool valid = false; | |
254 | ||
255 | /* No PCH on <stdin> or if not requested. */ | |
256 | if (file->name[0] == '\0' || !pfile->cb.valid_pch) | |
257 | return false; | |
17211ab5 | 258 | |
8f9b4009 NB |
259 | flen = strlen (path); |
260 | len = flen + sizeof (extension); | |
261 | pchname = xmalloc (len); | |
262 | memcpy (pchname, path, flen); | |
263 | memcpy (pchname + flen, extension, sizeof (extension)); | |
17211ab5 | 264 | |
8f9b4009 | 265 | if (stat (pchname, &st) == 0) |
17211ab5 | 266 | { |
8f9b4009 NB |
267 | DIR *pchdir; |
268 | struct dirent *d; | |
269 | size_t dlen, plen = len; | |
270 | ||
271 | if (!S_ISDIR (st.st_mode)) | |
272 | valid = validate_pch (pfile, file, pchname); | |
273 | else if ((pchdir = opendir (pchname)) != NULL) | |
17211ab5 | 274 | { |
8f9b4009 NB |
275 | pchname[plen - 1] = '/'; |
276 | while ((d = readdir (pchdir)) != NULL) | |
8d973a83 | 277 | { |
8f9b4009 | 278 | dlen = strlen (d->d_name) + 1; |
230fcd32 PE |
279 | if ((strcmp (d->d_name, ".") == 0) |
280 | || (strcmp (d->d_name, "..") == 0)) | |
281 | continue; | |
8f9b4009 | 282 | if (dlen + plen > len) |
17211ab5 | 283 | { |
8f9b4009 NB |
284 | len += dlen + 64; |
285 | pchname = xrealloc (pchname, len); | |
17211ab5 | 286 | } |
8f9b4009 NB |
287 | memcpy (pchname + plen, d->d_name, dlen); |
288 | valid = validate_pch (pfile, file, pchname); | |
289 | if (valid) | |
8d973a83 | 290 | break; |
17211ab5 | 291 | } |
8f9b4009 | 292 | closedir (pchdir); |
17211ab5 | 293 | } |
230fcd32 | 294 | file->pch |= valid; |
3d67ba1e | 295 | *invalid_pch |= ! valid; |
17211ab5 | 296 | } |
8d973a83 | 297 | |
8f9b4009 NB |
298 | if (valid) |
299 | file->pchname = pchname; | |
300 | else | |
301 | free (pchname); | |
302 | ||
303 | return valid; | |
17211ab5 GK |
304 | } |
305 | ||
8f9b4009 | 306 | /* Try to open the path FILE->name appended to FILE->dir. This is |
cf1ee30c | 307 | where remap and PCH intercept the file lookup process. Return true |
3d67ba1e GK |
308 | if the file was found, whether or not the open was successful. |
309 | Set *INVALID_PCH to true if a PCH file is found but wasn't valid. */ | |
310 | ||
e5eba70a | 311 | static bool |
3d67ba1e | 312 | find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) |
a58d32c2 | 313 | { |
8f9b4009 | 314 | char *path; |
51d0f328 | 315 | |
8f9b4009 NB |
316 | if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file))) |
317 | ; | |
318 | else | |
319 | path = append_file_to_dir (file->name, file->dir); | |
e5eba70a | 320 | |
8f9b4009 | 321 | file->path = path; |
3d67ba1e | 322 | if (pch_open_file (pfile, file, invalid_pch)) |
8f9b4009 | 323 | return true; |
51d0f328 | 324 | |
8f9b4009 NB |
325 | if (open_file (file)) |
326 | return true; | |
51d0f328 | 327 | |
cf1ee30c NB |
328 | if (file->err_no != ENOENT) |
329 | { | |
330 | open_file_failed (pfile, file); | |
331 | return true; | |
332 | } | |
333 | ||
8f9b4009 | 334 | free (path); |
cf1ee30c | 335 | file->path = file->name; |
8f9b4009 NB |
336 | return false; |
337 | } | |
338 | ||
4dc299fb PB |
339 | bool |
340 | _cpp_find_failed (_cpp_file *file) | |
341 | { | |
342 | return file->err_no != 0; | |
343 | } | |
344 | ||
8f9b4009 NB |
345 | /* Given a filename FNAME search for such a file in the include path |
346 | starting from START_DIR. If FNAME is the empty string it is | |
347 | interpreted as STDIN if START_DIR is PFILE->no_seach_path. | |
348 | ||
349 | If the file is not found in the file cache fall back to the O/S and | |
350 | add the result to our cache. | |
351 | ||
352 | If the file was not found in the filesystem, or there was an error | |
02fa63cd | 353 | opening it, then ERR_NO is nonzero and FD is -1. If the file was |
8f9b4009 NB |
354 | found, then ERR_NO is zero and FD could be -1 or an open file |
355 | descriptor. FD can be -1 if the file was found in the cache and | |
356 | had previously been closed. To open it again pass the return value | |
357 | to open_file(). | |
358 | */ | |
4dc299fb PB |
359 | _cpp_file * |
360 | _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, bool fake) | |
8f9b4009 NB |
361 | { |
362 | struct file_hash_entry *entry, **hash_slot; | |
363 | _cpp_file *file; | |
3d67ba1e | 364 | bool invalid_pch = false; |
8f9b4009 NB |
365 | |
366 | /* Ensure we get no confusion between cached files and directories. */ | |
367 | if (start_dir == NULL) | |
0527bc4e | 368 | cpp_error (pfile, CPP_DL_ICE, "NULL directory in find_file"); |
8f9b4009 NB |
369 | |
370 | hash_slot = (struct file_hash_entry **) | |
b92be669 PB |
371 | htab_find_slot_with_hash (pfile->file_hash, fname, |
372 | htab_hash_string (fname), | |
373 | INSERT); | |
17211ab5 | 374 | |
8f9b4009 NB |
375 | /* First check the cache before we resort to memory allocation. */ |
376 | entry = search_cache (*hash_slot, start_dir); | |
377 | if (entry) | |
378 | return entry->u.file; | |
379 | ||
380 | file = make_cpp_file (pfile, start_dir, fname); | |
381 | ||
382 | /* Try each path in the include chain. */ | |
383 | for (; !fake ;) | |
7c092714 | 384 | { |
3d67ba1e | 385 | if (find_file_in_dir (pfile, file, &invalid_pch)) |
8f9b4009 NB |
386 | break; |
387 | ||
cf1ee30c NB |
388 | file->dir = file->dir->next; |
389 | if (file->dir == NULL) | |
e5eba70a | 390 | { |
8f9b4009 | 391 | open_file_failed (pfile, file); |
3d67ba1e GK |
392 | if (invalid_pch) |
393 | { | |
394 | cpp_error (pfile, CPP_DL_ERROR, | |
e235d8bf GK |
395 | "one or more PCH files were found, but they were invalid"); |
396 | if (!cpp_get_options (pfile)->warn_invalid_pch) | |
3d67ba1e | 397 | cpp_error (pfile, CPP_DL_ERROR, |
e235d8bf | 398 | "use -Winvalid-pch for more information"); |
3d67ba1e | 399 | } |
8f9b4009 | 400 | break; |
e5eba70a | 401 | } |
eb1f4d9d | 402 | |
8f9b4009 NB |
403 | /* Only check the cache for the starting location (done above) |
404 | and the quote and bracket chain heads because there are no | |
405 | other possible starting points for searches. */ | |
406 | if (file->dir != pfile->bracket_include | |
407 | && file->dir != pfile->quote_include) | |
408 | continue; | |
a58d32c2 | 409 | |
8f9b4009 NB |
410 | entry = search_cache (*hash_slot, file->dir); |
411 | if (entry) | |
49634b3a NB |
412 | break; |
413 | } | |
414 | ||
415 | if (entry) | |
416 | { | |
417 | /* Cache for START_DIR too, sharing the _cpp_file structure. */ | |
418 | free ((char *) file->name); | |
419 | free (file); | |
420 | file = entry->u.file; | |
421 | } | |
422 | else | |
423 | { | |
424 | /* This is a new file; put it in the list. */ | |
425 | file->next_file = pfile->all_files; | |
426 | pfile->all_files = file; | |
8f9b4009 | 427 | } |
eb1f4d9d | 428 | |
8f9b4009 NB |
429 | /* Store this new result in the hash table. */ |
430 | entry = new_file_hash_entry (pfile); | |
431 | entry->next = *hash_slot; | |
432 | entry->start_dir = start_dir; | |
433 | entry->u.file = file; | |
434 | *hash_slot = entry; | |
e5eba70a | 435 | |
8f9b4009 | 436 | return file; |
a58d32c2 ZW |
437 | } |
438 | ||
8f9b4009 | 439 | /* Read a file into FILE->buffer, returning true on success. |
a58d32c2 | 440 | |
8f9b4009 NB |
441 | If FILE->fd is something weird, like a block device, we don't want |
442 | to read it at all. Don't even try to figure out what something is, | |
443 | except for plain files and block devices, since there is no | |
444 | reliable portable way of doing this. | |
a58d32c2 ZW |
445 | |
446 | FIXME: Flush file cache and try again if we run out of memory. */ | |
8f9b4009 NB |
447 | static bool |
448 | read_file_guts (cpp_reader *pfile, _cpp_file *file) | |
a58d32c2 | 449 | { |
8f9b4009 | 450 | ssize_t size, total, count; |
562a5c27 | 451 | uchar *buf; |
8f9b4009 NB |
452 | bool regular; |
453 | ||
454 | if (S_ISBLK (file->st.st_mode)) | |
455 | { | |
0527bc4e | 456 | cpp_error (pfile, CPP_DL_ERROR, "%s is a block device", file->path); |
8f9b4009 NB |
457 | return false; |
458 | } | |
a58d32c2 | 459 | |
8f9b4009 NB |
460 | regular = S_ISREG (file->st.st_mode); |
461 | if (regular) | |
f2d5f0cc | 462 | { |
a58d32c2 ZW |
463 | /* off_t might have a wider range than ssize_t - in other words, |
464 | the max size of a file might be bigger than the address | |
465 | space. We can't handle a file that large. (Anyone with | |
466 | a single source file bigger than 2GB needs to rethink | |
467 | their coding style.) Some systems (e.g. AIX 4.1) define | |
468 | SSIZE_MAX to be much smaller than the actual range of the | |
469 | type. Use INTTYPE_MAXIMUM unconditionally to ensure this | |
470 | does not bite us. */ | |
8f9b4009 | 471 | if (file->st.st_size > INTTYPE_MAXIMUM (ssize_t)) |
f2d5f0cc | 472 | { |
0527bc4e | 473 | cpp_error (pfile, CPP_DL_ERROR, "%s is too large", file->path); |
8f9b4009 | 474 | return false; |
f2d5f0cc | 475 | } |
a58d32c2 | 476 | |
8f9b4009 NB |
477 | size = file->st.st_size; |
478 | } | |
479 | else | |
480 | /* 8 kilobytes is a sensible starting size. It ought to be bigger | |
481 | than the kernel pipe buffer, and it's definitely bigger than | |
482 | the majority of C source files. */ | |
483 | size = 8 * 1024; | |
484 | ||
485 | buf = xmalloc (size + 1); | |
486 | total = 0; | |
487 | while ((count = read (file->fd, buf + total, size - total)) > 0) | |
488 | { | |
489 | total += count; | |
490 | ||
491 | if (total == size) | |
d4506961 | 492 | { |
8f9b4009 NB |
493 | if (regular) |
494 | break; | |
495 | size *= 2; | |
496 | buf = xrealloc (buf, size + 1); | |
d4506961 | 497 | } |
a58d32c2 | 498 | } |
8f9b4009 NB |
499 | |
500 | if (count < 0) | |
a58d32c2 | 501 | { |
0527bc4e | 502 | cpp_errno (pfile, CPP_DL_ERROR, file->path); |
8f9b4009 | 503 | return false; |
a58d32c2 | 504 | } |
8f9b4009 NB |
505 | |
506 | if (regular && total != size && STAT_SIZE_RELIABLE (file->st)) | |
0527bc4e JDA |
507 | cpp_error (pfile, CPP_DL_WARNING, |
508 | "%s is shorter than expected", file->path); | |
8f9b4009 NB |
509 | |
510 | /* Shrink buffer if we allocated substantially too much. */ | |
511 | if (total + 4096 < size) | |
512 | buf = xrealloc (buf, total + 1); | |
513 | ||
514 | /* The lexer requires that the buffer be \n-terminated. */ | |
515 | buf[total] = '\n'; | |
516 | ||
517 | file->buffer = buf; | |
518 | file->st.st_size = total; | |
519 | file->buffer_valid = true; | |
520 | ||
521 | return true; | |
522 | } | |
523 | ||
524 | /* Convenience wrapper around read_file_guts that opens the file if | |
a98ebe2e | 525 | necessary and closes the file descriptor after reading. FILE must |
8f9b4009 NB |
526 | have been passed through find_file() at some stage. */ |
527 | static bool | |
528 | read_file (cpp_reader *pfile, _cpp_file *file) | |
529 | { | |
8f9b4009 NB |
530 | /* If we already have its contents in memory, succeed immediately. */ |
531 | if (file->buffer_valid) | |
532 | return true; | |
a58d32c2 | 533 | |
8f9b4009 NB |
534 | /* If an earlier read failed for some reason don't try again. */ |
535 | if (file->dont_read || file->err_no) | |
536 | return false; | |
4d6baafa | 537 | |
8f9b4009 NB |
538 | if (file->fd == -1 && !open_file (file)) |
539 | { | |
540 | open_file_failed (pfile, file); | |
541 | return false; | |
f2d5f0cc | 542 | } |
d7a2e0f7 | 543 | |
8f9b4009 NB |
544 | file->dont_read = !read_file_guts (pfile, file); |
545 | close (file->fd); | |
546 | file->fd = -1; | |
a58d32c2 | 547 | |
8f9b4009 | 548 | return !file->dont_read; |
a58d32c2 ZW |
549 | } |
550 | ||
cf1ee30c NB |
551 | /* Returns TRUE if FILE's contents have been successfully placed in |
552 | FILE->buffer and the file should be stacked, otherwise false. */ | |
8f9b4009 | 553 | static bool |
cf1ee30c | 554 | should_stack_file (cpp_reader *pfile, _cpp_file *file, bool import) |
a58d32c2 | 555 | { |
cf1ee30c | 556 | _cpp_file *f; |
8f9b4009 | 557 | |
49634b3a NB |
558 | /* Skip once-only files. */ |
559 | if (file->once_only) | |
560 | return false; | |
561 | ||
562 | /* We must mark the file once-only if #import now, before header | |
563 | guard checks. Otherwise, undefining the header guard might | |
564 | cause the file to be re-stacked. */ | |
565 | if (import) | |
566 | { | |
567 | _cpp_mark_file_once_only (pfile, file); | |
568 | ||
569 | /* Don't stack files that have been stacked before. */ | |
570 | if (file->stack_count) | |
571 | return false; | |
572 | } | |
573 | ||
cf1ee30c NB |
574 | /* Skip if the file had a header guard and the macro is defined. |
575 | PCH relies on this appearing before the PCH handler below. */ | |
576 | if (file->cmacro && file->cmacro->type == NT_MACRO) | |
bf42e45b NB |
577 | return false; |
578 | ||
cf1ee30c NB |
579 | /* Handle PCH files immediately; don't stack them. */ |
580 | if (include_pch_p (file)) | |
c31a6508 | 581 | { |
cf1ee30c NB |
582 | pfile->cb.read_pch (pfile, file->path, file->fd, file->pchname); |
583 | close (file->fd); | |
584 | file->fd = -1; | |
585 | return false; | |
c31a6508 | 586 | } |
8f9b4009 | 587 | |
8f9b4009 NB |
588 | if (!read_file (pfile, file)) |
589 | return false; | |
c31a6508 | 590 | |
49634b3a NB |
591 | /* Now we've read the file's contents, we can stack it if there |
592 | are no once-only files. */ | |
593 | if (!pfile->seen_once_only) | |
cf1ee30c NB |
594 | return true; |
595 | ||
49634b3a | 596 | /* We may have read the file under a different name. Look |
8f9b4009 | 597 | for likely candidates and compare file contents to be sure. */ |
49634b3a | 598 | for (f = pfile->all_files; f; f = f->next_file) |
8f9b4009 NB |
599 | { |
600 | if (f == file) | |
601 | continue; | |
602 | ||
49634b3a NB |
603 | if ((import || f->once_only) |
604 | && f->err_no == 0 | |
8f9b4009 NB |
605 | && f->st.st_mtime == file->st.st_mtime |
606 | && f->st.st_size == file->st.st_size | |
607 | && read_file (pfile, f) | |
608 | /* Size might have changed in read_file(). */ | |
609 | && f->st.st_size == file->st.st_size | |
610 | && !memcmp (f->buffer, file->buffer, f->st.st_size)) | |
bf42e45b | 611 | break; |
0b3d776a | 612 | } |
8f9b4009 | 613 | |
cf1ee30c NB |
614 | return f == NULL; |
615 | } | |
616 | ||
617 | /* Place the file referenced by FILE into a new buffer on the buffer | |
618 | stack if possible. IMPORT is true if this stacking attempt is | |
619 | because of a #import directive. Returns true if a buffer is | |
620 | stacked. */ | |
4dc299fb PB |
621 | bool |
622 | _cpp_stack_file (cpp_reader *pfile, _cpp_file *file, bool import) | |
cf1ee30c NB |
623 | { |
624 | cpp_buffer *buffer; | |
625 | int sysp; | |
626 | ||
627 | if (!should_stack_file (pfile, file, import)) | |
628 | return false; | |
629 | ||
630 | sysp = MAX ((pfile->map ? pfile->map->sysp : 0), | |
631 | (file->dir ? file->dir->sysp : 0)); | |
632 | ||
633 | /* Add the file to the dependencies on its first inclusion. */ | |
634 | if (CPP_OPTION (pfile, deps.style) > !!sysp && !file->stack_count) | |
635 | { | |
636 | if (!file->main_file || !CPP_OPTION (pfile, deps.ignore_main_file)) | |
637 | deps_add_dep (pfile->deps, file->path); | |
638 | } | |
639 | ||
640 | /* Clear buffer_valid since _cpp_clean_line messes it up. */ | |
641 | file->buffer_valid = false; | |
642 | file->stack_count++; | |
643 | ||
644 | /* Stack the buffer. */ | |
645 | buffer = cpp_push_buffer (pfile, file->buffer, file->st.st_size, | |
4dc299fb | 646 | CPP_OPTION (pfile, preprocessed)); |
cf1ee30c NB |
647 | buffer->file = file; |
648 | ||
649 | /* Initialize controlling macro state. */ | |
650 | pfile->mi_valid = true; | |
651 | pfile->mi_cmacro = 0; | |
652 | ||
653 | /* Generate the call back. */ | |
76bf2c97 | 654 | _cpp_do_file_change (pfile, LC_ENTER, file->path, 1, sysp); |
cf1ee30c NB |
655 | |
656 | return true; | |
add7091b ZW |
657 | } |
658 | ||
49634b3a | 659 | /* Mark FILE to be included once only. */ |
8f9b4009 | 660 | void |
49634b3a | 661 | _cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file) |
f2d5f0cc | 662 | { |
49634b3a NB |
663 | pfile->seen_once_only = true; |
664 | file->once_only = true; | |
8f9b4009 NB |
665 | } |
666 | ||
667 | /* Return the directory from which searching for FNAME should start, | |
2067c116 | 668 | considering the directive TYPE and ANGLE_BRACKETS. If there is |
8f9b4009 NB |
669 | nothing left in the path, returns NULL. */ |
670 | static struct cpp_dir * | |
671 | search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets, | |
672 | enum include_type type) | |
673 | { | |
674 | cpp_dir *dir; | |
675 | _cpp_file *file; | |
74eb4b3e | 676 | |
3dce1408 | 677 | if (IS_ABSOLUTE_PATH (fname)) |
8f9b4009 NB |
678 | return &pfile->no_search_path; |
679 | ||
4dc299fb PB |
680 | /* pfile->buffer is NULL when processing an -include command-line flag. */ |
681 | file = pfile->buffer == NULL ? pfile->main_file : pfile->buffer->file; | |
41947a54 NB |
682 | |
683 | /* For #include_next, skip in the search path past the dir in which | |
e7182666 NB |
684 | the current file was found, but if it was found via an absolute |
685 | path use the normal search logic. */ | |
8f9b4009 NB |
686 | if (type == IT_INCLUDE_NEXT && file->dir) |
687 | dir = file->dir->next; | |
74eb4b3e | 688 | else if (angle_brackets) |
8f9b4009 NB |
689 | dir = pfile->bracket_include; |
690 | else if (type == IT_CMDLINE) | |
691 | /* -include and -imacros use the #include "" chain with the | |
692 | preprocessor's cwd prepended. */ | |
693 | return make_cpp_dir (pfile, "./", false); | |
694 | else if (pfile->quote_ignores_source_dir) | |
695 | dir = pfile->quote_include; | |
41947a54 | 696 | else |
8f9b4009 NB |
697 | return make_cpp_dir (pfile, dir_name_of_file (file), pfile->map->sysp); |
698 | ||
699 | if (dir == NULL) | |
0527bc4e | 700 | cpp_error (pfile, CPP_DL_ERROR, |
8f9b4009 NB |
701 | "no include path in which to search for %s", fname); |
702 | ||
703 | return dir; | |
704 | } | |
41947a54 | 705 | |
8f9b4009 | 706 | /* Strip the basename from the file's path. It ends with a slash if |
02fa63cd | 707 | of nonzero length. Note that this procedure also works for |
8f9b4009 NB |
708 | <stdin>, which is represented by the empty string. */ |
709 | static const char * | |
710 | dir_name_of_file (_cpp_file *file) | |
711 | { | |
712 | if (!file->dir_name) | |
41947a54 | 713 | { |
8f9b4009 NB |
714 | size_t len = lbasename (file->path) - file->path; |
715 | char *dir_name = xmalloc (len + 1); | |
716 | ||
717 | memcpy (dir_name, file->path, len); | |
718 | dir_name[len] = '\0'; | |
719 | file->dir_name = dir_name; | |
41947a54 NB |
720 | } |
721 | ||
8f9b4009 NB |
722 | return file->dir_name; |
723 | } | |
724 | ||
8f9b4009 NB |
725 | /* Handles #include-family directives (distinguished by TYPE), |
726 | including HEADER, and the command line -imacros and -include. | |
727 | Returns true if a buffer was stacked. */ | |
728 | bool | |
729 | _cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets, | |
730 | enum include_type type) | |
731 | { | |
732 | struct cpp_dir *dir; | |
733 | ||
734 | dir = search_path_head (pfile, fname, angle_brackets, type); | |
735 | if (!dir) | |
736 | return false; | |
737 | ||
4dc299fb | 738 | return _cpp_stack_file (pfile, _cpp_find_file (pfile, fname, dir, false), |
8f9b4009 NB |
739 | type == IT_IMPORT); |
740 | } | |
741 | ||
742 | /* Could not open FILE. The complication is dependency output. */ | |
743 | static void | |
744 | open_file_failed (cpp_reader *pfile, _cpp_file *file) | |
745 | { | |
746 | int sysp = pfile->map ? pfile->map->sysp: 0; | |
747 | bool print_dep = CPP_OPTION (pfile, deps.style) > !!sysp; | |
748 | ||
749 | errno = file->err_no; | |
750 | if (print_dep && CPP_OPTION (pfile, deps.missing_files) && errno == ENOENT) | |
bf42e45b | 751 | deps_add_dep (pfile->deps, file->name); |
8f9b4009 | 752 | else |
add7091b | 753 | { |
8f9b4009 NB |
754 | /* If we are outputting dependencies but not for this file then |
755 | don't error because we can still produce correct output. */ | |
756 | if (CPP_OPTION (pfile, deps.style) && ! print_dep) | |
0527bc4e | 757 | cpp_errno (pfile, CPP_DL_WARNING, file->path); |
e7182666 | 758 | else |
0527bc4e | 759 | cpp_errno (pfile, CPP_DL_ERROR, file->path); |
add7091b | 760 | } |
8f9b4009 | 761 | } |
591e15a1 | 762 | |
8f9b4009 NB |
763 | /* Search in the chain beginning at HEAD for a file whose search path |
764 | started at START_DIR != NULL. */ | |
765 | static struct file_hash_entry * | |
766 | search_cache (struct file_hash_entry *head, const cpp_dir *start_dir) | |
767 | { | |
768 | while (head && head->start_dir != start_dir) | |
769 | head = head->next; | |
770 | ||
771 | return head; | |
772 | } | |
773 | ||
774 | /* Allocate a new _cpp_file structure. */ | |
775 | static _cpp_file * | |
776 | make_cpp_file (cpp_reader *pfile, cpp_dir *dir, const char *fname) | |
777 | { | |
778 | _cpp_file *file; | |
779 | ||
780 | file = xcalloc (1, sizeof (_cpp_file)); | |
781 | file->main_file = !pfile->buffer; | |
782 | file->fd = -1; | |
783 | file->dir = dir; | |
784 | file->name = xstrdup (fname); | |
785 | ||
786 | return file; | |
787 | } | |
788 | ||
789 | /* A hash of directory names. The directory names are the path names | |
790 | of files which contain a #include "", the included file name is | |
791 | appended to this directories. | |
792 | ||
793 | To avoid duplicate entries we follow the convention that all | |
794 | non-empty directory names should end in a '/'. DIR_NAME must be | |
795 | stored in permanently allocated memory. */ | |
796 | static cpp_dir * | |
797 | make_cpp_dir (cpp_reader *pfile, const char *dir_name, int sysp) | |
798 | { | |
799 | struct file_hash_entry *entry, **hash_slot; | |
800 | cpp_dir *dir; | |
801 | ||
802 | hash_slot = (struct file_hash_entry **) | |
b92be669 PB |
803 | htab_find_slot_with_hash (pfile->file_hash, dir_name, |
804 | htab_hash_string (dir_name), | |
805 | INSERT); | |
8f9b4009 NB |
806 | |
807 | /* Have we already hashed this directory? */ | |
808 | for (entry = *hash_slot; entry; entry = entry->next) | |
809 | if (entry->start_dir == NULL) | |
810 | return entry->u.dir; | |
811 | ||
812 | dir = xcalloc (1, sizeof (cpp_dir)); | |
813 | dir->next = pfile->quote_include; | |
814 | dir->name = (char *) dir_name; | |
815 | dir->len = strlen (dir_name); | |
816 | dir->sysp = sysp; | |
817 | ||
818 | /* Store this new result in the hash table. */ | |
819 | entry = new_file_hash_entry (pfile); | |
820 | entry->next = *hash_slot; | |
821 | entry->start_dir = NULL; | |
822 | entry->u.dir = dir; | |
823 | *hash_slot = entry; | |
824 | ||
825 | return dir; | |
826 | } | |
827 | ||
828 | /* Create a new block of memory for file hash entries. */ | |
829 | static void | |
830 | allocate_file_hash_entries (cpp_reader *pfile) | |
831 | { | |
832 | pfile->file_hash_entries_used = 0; | |
833 | pfile->file_hash_entries_allocated = 127; | |
834 | pfile->file_hash_entries = xmalloc | |
835 | (pfile->file_hash_entries_allocated * sizeof (struct file_hash_entry)); | |
836 | } | |
837 | ||
838 | /* Return a new file hash entry. */ | |
839 | static struct file_hash_entry * | |
840 | new_file_hash_entry (cpp_reader *pfile) | |
841 | { | |
842 | if (pfile->file_hash_entries_used == pfile->file_hash_entries_allocated) | |
843 | allocate_file_hash_entries (pfile); | |
844 | ||
845 | return &pfile->file_hash_entries[pfile->file_hash_entries_used++]; | |
846 | } | |
847 | ||
848 | /* Returns TRUE if a file FNAME has ever been successfully opened. | |
849 | This routine is not intended to correctly handle filenames aliased | |
850 | by links or redundant . or .. traversals etc. */ | |
851 | bool | |
852 | cpp_included (cpp_reader *pfile, const char *fname) | |
853 | { | |
854 | struct file_hash_entry *entry; | |
855 | ||
b92be669 PB |
856 | entry = htab_find_with_hash (pfile->file_hash, fname, |
857 | htab_hash_string (fname)); | |
8f9b4009 NB |
858 | |
859 | while (entry && (entry->start_dir == NULL || entry->u.file->err_no)) | |
860 | entry = entry->next; | |
861 | ||
862 | return entry != NULL; | |
863 | } | |
864 | ||
6614fd40 | 865 | /* Calculate the hash value of a file hash entry P. */ |
b92be669 PB |
866 | |
867 | static hashval_t | |
868 | file_hash_hash (const void *p) | |
869 | { | |
870 | struct file_hash_entry *entry = (struct file_hash_entry *) p; | |
871 | const char *hname; | |
872 | if (entry->start_dir) | |
873 | hname = entry->u.file->name; | |
874 | else | |
875 | hname = entry->u.dir->name; | |
876 | ||
877 | return htab_hash_string (hname); | |
878 | } | |
879 | ||
8f9b4009 NB |
880 | /* Compare a string Q against a file hash entry P. */ |
881 | static int | |
b92be669 | 882 | file_hash_eq (const void *p, const void *q) |
8f9b4009 NB |
883 | { |
884 | struct file_hash_entry *entry = (struct file_hash_entry *) p; | |
885 | const char *fname = (const char *) q; | |
886 | const char *hname; | |
887 | ||
888 | if (entry->start_dir) | |
889 | hname = entry->u.file->name; | |
890 | else | |
891 | hname = entry->u.dir->name; | |
892 | ||
893 | return strcmp (hname, fname) == 0; | |
894 | } | |
895 | ||
896 | /* Initialize everything in this source file. */ | |
897 | void | |
898 | _cpp_init_files (cpp_reader *pfile) | |
899 | { | |
b92be669 | 900 | pfile->file_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, |
8f9b4009 NB |
901 | NULL, xcalloc, free); |
902 | allocate_file_hash_entries (pfile); | |
903 | } | |
904 | ||
905 | /* Finalize everything in this source file. */ | |
906 | void | |
907 | _cpp_cleanup_files (cpp_reader *pfile) | |
908 | { | |
909 | htab_delete (pfile->file_hash); | |
910 | } | |
911 | ||
912 | /* Enter a file name in the hash for the sake of cpp_included. */ | |
913 | void | |
914 | _cpp_fake_include (cpp_reader *pfile, const char *fname) | |
915 | { | |
4dc299fb | 916 | _cpp_find_file (pfile, fname, pfile->buffer->file->dir, true); |
add7091b ZW |
917 | } |
918 | ||
e605b040 | 919 | /* Not everyone who wants to set system-header-ness on a buffer can |
642ce434 NB |
920 | see the details of a buffer. This is an exported interface because |
921 | fix-header needs it. */ | |
e605b040 | 922 | void |
6cf87ca4 | 923 | cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc) |
e605b040 | 924 | { |
614c7d37 NB |
925 | int flags = 0; |
926 | ||
927 | /* 1 = system header, 2 = system header to be treated as C. */ | |
928 | if (syshdr) | |
929 | flags = 1 + (externc != 0); | |
47d89cf3 NB |
930 | _cpp_do_file_change (pfile, LC_RENAME, pfile->map->to_file, |
931 | SOURCE_LINE (pfile->map, pfile->line), flags); | |
e605b040 ZW |
932 | } |
933 | ||
b4e46cea PB |
934 | /* Allow the client to change the current file. Used by the front end |
935 | to achieve pseudo-file names like <built-in>. | |
936 | If REASON is LC_LEAVE, then NEW_NAME must be NULL. */ | |
c19b12cb | 937 | void |
6cf87ca4 ZW |
938 | cpp_change_file (cpp_reader *pfile, enum lc_reason reason, |
939 | const char *new_name) | |
c19b12cb | 940 | { |
b4e46cea | 941 | _cpp_do_file_change (pfile, reason, new_name, 1, 0); |
c19b12cb NB |
942 | } |
943 | ||
8f9b4009 | 944 | /* Callback function for htab_traverse. */ |
c71f835b | 945 | static int |
8f9b4009 | 946 | report_missing_guard (void **slot, void *b) |
c71f835b | 947 | { |
8f9b4009 | 948 | struct file_hash_entry *entry = (struct file_hash_entry *) *slot; |
dc65cd60 | 949 | int *bannerp = (int *) b; |
c71f835b | 950 | |
8f9b4009 NB |
951 | /* Skip directories. */ |
952 | if (entry->start_dir != NULL) | |
c71f835b | 953 | { |
8f9b4009 NB |
954 | _cpp_file *file = entry->u.file; |
955 | ||
956 | /* We don't want MI guard advice for the main file. */ | |
957 | if (file->cmacro == NULL && file->stack_count == 1 && !file->main_file) | |
c71f835b | 958 | { |
8f9b4009 NB |
959 | if (*bannerp == 0) |
960 | { | |
961 | fputs (_("Multiple include guards may be useful for:\n"), | |
962 | stderr); | |
963 | *bannerp = 1; | |
964 | } | |
965 | ||
966 | fputs (entry->u.file->path, stderr); | |
967 | putc ('\n', stderr); | |
c71f835b | 968 | } |
c71f835b | 969 | } |
c71f835b | 970 | |
8f9b4009 | 971 | return 0; |
a36c54fa NB |
972 | } |
973 | ||
8f9b4009 NB |
974 | /* Report on all files that might benefit from a multiple include guard. |
975 | Triggered by -H. */ | |
976 | void | |
977 | _cpp_report_missing_guards (cpp_reader *pfile) | |
168d3732 | 978 | { |
8f9b4009 | 979 | int banner = 0; |
ba133c96 | 980 | |
8f9b4009 | 981 | htab_traverse (pfile->file_hash, report_missing_guard, &banner); |
168d3732 ZW |
982 | } |
983 | ||
41947a54 | 984 | /* Locate HEADER, and determine whether it is newer than the current |
48c4721e | 985 | file. If it cannot be located or dated, return -1, if it is |
41947a54 | 986 | newer, return 1, otherwise 0. */ |
f3f751ad | 987 | int |
6cf87ca4 ZW |
988 | _cpp_compare_file_date (cpp_reader *pfile, const char *fname, |
989 | int angle_brackets) | |
f3f751ad | 990 | { |
8f9b4009 NB |
991 | _cpp_file *file; |
992 | struct cpp_dir *dir; | |
df383483 | 993 | |
8f9b4009 NB |
994 | dir = search_path_head (pfile, fname, angle_brackets, IT_INCLUDE); |
995 | if (!dir) | |
f3f751ad | 996 | return -1; |
41947a54 | 997 | |
4dc299fb | 998 | file = _cpp_find_file (pfile, fname, dir, false); |
8f9b4009 NB |
999 | if (file->err_no) |
1000 | return -1; | |
c45da1ca | 1001 | |
8f9b4009 | 1002 | if (file->fd != -1) |
c0bfe993 | 1003 | { |
8f9b4009 NB |
1004 | close (file->fd); |
1005 | file->fd = -1; | |
c0bfe993 | 1006 | } |
041c3194 | 1007 | |
8f9b4009 | 1008 | return file->st.st_mtime > pfile->buffer->file->st.st_mtime; |
f8f769ea ZW |
1009 | } |
1010 | ||
c19b12cb NB |
1011 | /* Pushes the given file onto the buffer stack. Returns nonzero if |
1012 | successful. */ | |
1013 | bool | |
8f9b4009 | 1014 | cpp_push_include (cpp_reader *pfile, const char *fname) |
c19b12cb | 1015 | { |
c19b12cb NB |
1016 | /* Make the command line directive take up a line. */ |
1017 | pfile->line++; | |
8f9b4009 | 1018 | return _cpp_stack_include (pfile, fname, false, IT_CMDLINE); |
c19b12cb NB |
1019 | } |
1020 | ||
5d8ebbd8 | 1021 | /* Do appropriate cleanup when a file INC's buffer is popped off the |
af0d16cd NB |
1022 | input stack. */ |
1023 | void | |
8f9b4009 | 1024 | _cpp_pop_file_buffer (cpp_reader *pfile, _cpp_file *file) |
f9a0e96c | 1025 | { |
ba133c96 | 1026 | /* Record the inclusion-preventing macro, which could be NULL |
6d18adbc | 1027 | meaning no controlling macro. */ |
8f9b4009 NB |
1028 | if (pfile->mi_valid && file->cmacro == NULL) |
1029 | file->cmacro = pfile->mi_cmacro; | |
93c80368 NB |
1030 | |
1031 | /* Invalidate control macros in the #including file. */ | |
6d18adbc | 1032 | pfile->mi_valid = false; |
f9a0e96c | 1033 | |
8f9b4009 NB |
1034 | if (file->buffer) |
1035 | { | |
1036 | free ((void *) file->buffer); | |
1037 | file->buffer = NULL; | |
1038 | } | |
f9a0e96c ZW |
1039 | } |
1040 | ||
8f9b4009 NB |
1041 | /* Set the include chain for "" to QUOTE, for <> to BRACKET. If |
1042 | QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the | |
1043 | directory of the including file. | |
ba133c96 | 1044 | |
8f9b4009 NB |
1045 | If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */ |
1046 | void | |
1047 | cpp_set_include_chains (cpp_reader *pfile, cpp_dir *quote, cpp_dir *bracket, | |
1048 | int quote_ignores_source_dir) | |
591e15a1 | 1049 | { |
8f9b4009 NB |
1050 | pfile->quote_include = quote; |
1051 | pfile->bracket_include = quote; | |
1052 | pfile->quote_ignores_source_dir = quote_ignores_source_dir; | |
591e15a1 | 1053 | |
8f9b4009 | 1054 | for (; quote; quote = quote->next) |
591e15a1 | 1055 | { |
8f9b4009 NB |
1056 | quote->name_map = NULL; |
1057 | quote->len = strlen (quote->name); | |
1058 | if (quote == bracket) | |
1059 | pfile->bracket_include = bracket; | |
ba133c96 | 1060 | } |
591e15a1 NB |
1061 | } |
1062 | ||
8f9b4009 NB |
1063 | /* Append the file name to the directory to create the path, but don't |
1064 | turn / into // or // into ///; // may be a namespace escape. */ | |
1065 | static char * | |
1066 | append_file_to_dir (const char *fname, cpp_dir *dir) | |
1067 | { | |
1068 | size_t dlen, flen; | |
1069 | char *path; | |
1070 | ||
1071 | dlen = dir->len; | |
1072 | flen = strlen (fname); | |
1073 | path = xmalloc (dlen + 1 + flen + 1); | |
1074 | memcpy (path, dir->name, dlen); | |
1075 | if (dlen && path[dlen - 1] != '/') | |
1076 | path[dlen++] = '/'; | |
1077 | memcpy (&path[dlen], fname, flen + 1); | |
1078 | ||
1079 | return path; | |
1080 | } | |
c31a6508 ZW |
1081 | |
1082 | /* Read a space delimited string of unlimited length from a stdio | |
5d8ebbd8 | 1083 | file F. */ |
c31a6508 | 1084 | static char * |
6cf87ca4 | 1085 | read_filename_string (int ch, FILE *f) |
c31a6508 ZW |
1086 | { |
1087 | char *alloc, *set; | |
1088 | int len; | |
1089 | ||
1090 | len = 20; | |
1091 | set = alloc = xmalloc (len + 1); | |
dc65cd60 | 1092 | if (! is_space (ch)) |
c31a6508 ZW |
1093 | { |
1094 | *set++ = ch; | |
dc65cd60 | 1095 | while ((ch = getc (f)) != EOF && ! is_space (ch)) |
c31a6508 ZW |
1096 | { |
1097 | if (set - alloc == len) | |
1098 | { | |
1099 | len *= 2; | |
1100 | alloc = xrealloc (alloc, len + 1); | |
1101 | set = alloc + len / 2; | |
1102 | } | |
1103 | *set++ = ch; | |
1104 | } | |
1105 | } | |
1106 | *set = '\0'; | |
1107 | ungetc (ch, f); | |
1108 | return alloc; | |
1109 | } | |
1110 | ||
8f9b4009 NB |
1111 | /* Read the file name map file for DIR. */ |
1112 | static void | |
1113 | read_name_map (cpp_dir *dir) | |
c31a6508 | 1114 | { |
8f9b4009 | 1115 | static const char FILE_NAME_MAP_FILE[] = "header.gcc"; |
c31a6508 ZW |
1116 | char *name; |
1117 | FILE *f; | |
8f9b4009 NB |
1118 | size_t len, count = 0, room = 9; |
1119 | ||
1120 | len = dir->len; | |
1121 | name = alloca (len + sizeof (FILE_NAME_MAP_FILE) + 1); | |
1122 | memcpy (name, dir->name, len); | |
1123 | if (len && name[len - 1] != '/') | |
1124 | name[len++] = '/'; | |
1125 | strcpy (name + len, FILE_NAME_MAP_FILE); | |
c31a6508 | 1126 | f = fopen (name, "r"); |
8767c894 | 1127 | |
8f9b4009 NB |
1128 | dir->name_map = xmalloc (room * sizeof (char *)); |
1129 | ||
8767c894 NB |
1130 | /* Silently return NULL if we cannot open. */ |
1131 | if (f) | |
c31a6508 ZW |
1132 | { |
1133 | int ch; | |
c31a6508 ZW |
1134 | |
1135 | while ((ch = getc (f)) != EOF) | |
1136 | { | |
8f9b4009 | 1137 | char *to; |
c31a6508 | 1138 | |
dc65cd60 | 1139 | if (is_space (ch)) |
c31a6508 | 1140 | continue; |
8f9b4009 NB |
1141 | |
1142 | if (count + 2 > room) | |
1143 | { | |
1144 | room += 8; | |
1145 | dir->name_map = xrealloc (dir->name_map, room * sizeof (char *)); | |
1146 | } | |
1147 | ||
1148 | dir->name_map[count] = read_filename_string (ch, f); | |
dc65cd60 | 1149 | while ((ch = getc (f)) != EOF && is_hspace (ch)) |
c31a6508 | 1150 | ; |
c31a6508 | 1151 | |
8f9b4009 | 1152 | to = read_filename_string (ch, f); |
3dce1408 | 1153 | if (IS_ABSOLUTE_PATH (to)) |
8f9b4009 | 1154 | dir->name_map[count + 1] = to; |
c31a6508 ZW |
1155 | else |
1156 | { | |
8f9b4009 | 1157 | dir->name_map[count + 1] = append_file_to_dir (to, dir); |
c31a6508 | 1158 | free (to); |
df383483 | 1159 | } |
c31a6508 | 1160 | |
8f9b4009 | 1161 | count += 2; |
c31a6508 ZW |
1162 | while ((ch = getc (f)) != '\n') |
1163 | if (ch == EOF) | |
1164 | break; | |
1165 | } | |
8f9b4009 | 1166 | |
c31a6508 ZW |
1167 | fclose (f); |
1168 | } | |
df383483 | 1169 | |
8f9b4009 NB |
1170 | /* Terminate the list of maps. */ |
1171 | dir->name_map[count] = NULL; | |
df383483 | 1172 | } |
c31a6508 | 1173 | |
8f9b4009 NB |
1174 | /* Remap a FILE's name based on the file_name_map, if any, for |
1175 | FILE->dir. If the file name has any directory separators, | |
1176 | recursively check those directories too. */ | |
c31a6508 | 1177 | static char * |
8f9b4009 | 1178 | remap_filename (cpp_reader *pfile, _cpp_file *file) |
c31a6508 | 1179 | { |
8f9b4009 NB |
1180 | const char *fname, *p; |
1181 | char *new_dir; | |
1182 | cpp_dir *dir; | |
1183 | size_t index, len; | |
8767c894 | 1184 | |
8f9b4009 NB |
1185 | dir = file->dir; |
1186 | fname = file->name; | |
df383483 | 1187 | |
8f9b4009 NB |
1188 | for (;;) |
1189 | { | |
1190 | if (!dir->name_map) | |
1191 | read_name_map (dir); | |
c31a6508 | 1192 | |
8f9b4009 NB |
1193 | for (index = 0; dir->name_map[index]; index += 2) |
1194 | if (!strcmp (dir->name_map[index], fname)) | |
1195 | return xstrdup (dir->name_map[index + 1]); | |
c31a6508 | 1196 | |
8f9b4009 NB |
1197 | p = strchr (fname, '/'); |
1198 | if (!p || p == fname) | |
1199 | return NULL; | |
f9200da2 | 1200 | |
8f9b4009 NB |
1201 | len = dir->len + (p - fname + 1); |
1202 | new_dir = xmalloc (len + 1); | |
1203 | memcpy (new_dir, dir->name, dir->len); | |
1204 | memcpy (new_dir + dir->len, fname, p - fname + 1); | |
1205 | new_dir[len] = '\0'; | |
df383483 | 1206 | |
8f9b4009 NB |
1207 | dir = make_cpp_dir (pfile, new_dir, dir->sysp); |
1208 | fname = p + 1; | |
0b3d776a | 1209 | } |
0b3d776a | 1210 | } |
986b1f13 | 1211 | |
8f9b4009 NB |
1212 | /* Return true if FILE is usable by PCH. */ |
1213 | static bool | |
1214 | include_pch_p (_cpp_file *file) | |
986b1f13 | 1215 | { |
8f9b4009 | 1216 | return file->pch & 1; |
986b1f13 NB |
1217 | } |
1218 | ||
8f9b4009 NB |
1219 | /* Returns true if PCHNAME is a valid PCH file for FILE. */ |
1220 | static bool | |
1221 | validate_pch (cpp_reader *pfile, _cpp_file *file, const char *pchname) | |
986b1f13 | 1222 | { |
8f9b4009 | 1223 | const char *saved_path = file->path; |
230fcd32 | 1224 | bool valid = false; |
986b1f13 | 1225 | |
8f9b4009 NB |
1226 | file->path = pchname; |
1227 | if (open_file (file)) | |
986b1f13 | 1228 | { |
230fcd32 | 1229 | valid = 1 & pfile->cb.valid_pch (pfile, pchname, file->fd); |
8f9b4009 | 1230 | |
230fcd32 | 1231 | if (!valid) |
986b1f13 | 1232 | { |
8f9b4009 NB |
1233 | close (file->fd); |
1234 | file->fd = -1; | |
986b1f13 | 1235 | } |
986b1f13 | 1236 | |
8f9b4009 | 1237 | if (CPP_OPTION (pfile, print_include_names)) |
986b1f13 | 1238 | { |
8f9b4009 NB |
1239 | unsigned int i; |
1240 | for (i = 1; i < pfile->line_maps.depth; i++) | |
1241 | putc ('.', stderr); | |
1242 | fprintf (stderr, "%c %s\n", | |
230fcd32 | 1243 | valid ? '!' : 'x', pchname); |
986b1f13 | 1244 | } |
986b1f13 NB |
1245 | } |
1246 | ||
8f9b4009 | 1247 | file->path = saved_path; |
230fcd32 | 1248 | return valid; |
986b1f13 | 1249 | } |