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