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Commit | Line | Data |
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8f9b4009 | 1 | /* Part of CPP library. File handling. |
5793b276 | 2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998, |
31c3e631 | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005 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 | |
200031d1 | 22 | Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
add7091b ZW |
23 | |
24 | #include "config.h" | |
25 | #include "system.h" | |
add7091b | 26 | #include "cpplib.h" |
4f4e53dd | 27 | #include "internal.h" |
168d3732 | 28 | #include "mkdeps.h" |
bf42e45b | 29 | #include "hashtab.h" |
73e61092 | 30 | #include "md5.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 | 42 | #ifdef __DJGPP__ |
473c5bc9 | 43 | #include <io.h> |
8f9b4009 NB |
44 | /* For DJGPP redirected input is opened in text mode. */ |
45 | # define set_stdin_to_binary_mode() \ | |
46 | if (! isatty (0)) setmode (0, O_BINARY) | |
47 | #else | |
48 | # define set_stdin_to_binary_mode() /* Nothing */ | |
49 | #endif | |
50 | ||
8f9b4009 NB |
51 | /* This structure represents a file searched for by CPP, whether it |
52 | exists or not. An instance may be pointed to by more than one | |
53 | file_hash_entry; at present no reference count is kept. */ | |
8f9b4009 NB |
54 | struct _cpp_file |
55 | { | |
56 | /* Filename as given to #include or command line switch. */ | |
57 | const char *name; | |
642ce434 | 58 | |
8f9b4009 NB |
59 | /* The full path used to find the file. */ |
60 | const char *path; | |
ae1139f9 | 61 | |
8f9b4009 NB |
62 | /* The full path of the pch file. */ |
63 | const char *pchname; | |
add7091b | 64 | |
bf42e45b NB |
65 | /* The file's path with the basename stripped. NULL if it hasn't |
66 | been calculated yet. */ | |
8f9b4009 | 67 | const char *dir_name; |
c71f835b | 68 | |
49634b3a NB |
69 | /* Chain through all files. */ |
70 | struct _cpp_file *next_file; | |
a36c54fa | 71 | |
8f9b4009 NB |
72 | /* The contents of NAME after calling read_file(). */ |
73 | const uchar *buffer; | |
a36c54fa | 74 | |
8f9b4009 NB |
75 | /* The macro, if any, preventing re-inclusion. */ |
76 | const cpp_hashnode *cmacro; | |
642ce434 | 77 | |
8f9b4009 NB |
78 | /* The directory in the search path where FILE was found. Used for |
79 | #include_next and determining whether a header is a system | |
bf42e45b | 80 | header. */ |
8f9b4009 | 81 | cpp_dir *dir; |
a36c54fa | 82 | |
8f9b4009 NB |
83 | /* As filled in by stat(2) for the file. */ |
84 | struct stat st; | |
a36c54fa | 85 | |
8f9b4009 NB |
86 | /* File descriptor. Invalid if -1, otherwise open. */ |
87 | int fd; | |
d6d52dd6 | 88 | |
8f9b4009 NB |
89 | /* Zero if this file was successfully opened and stat()-ed, |
90 | otherwise errno obtained from failure. */ | |
91 | int err_no; | |
add7091b | 92 | |
8f9b4009 NB |
93 | /* Number of times the file has been stacked for preprocessing. */ |
94 | unsigned short stack_count; | |
2047e26f | 95 | |
49634b3a NB |
96 | /* If opened with #import or contains #pragma once. */ |
97 | bool once_only; | |
add7091b | 98 | |
8f9b4009 NB |
99 | /* If read() failed before. */ |
100 | bool dont_read; | |
add7091b | 101 | |
8f9b4009 NB |
102 | /* If this file is the main file. */ |
103 | bool main_file; | |
add7091b | 104 | |
8f9b4009 NB |
105 | /* If BUFFER above contains the true contents of the file. */ |
106 | bool buffer_valid; | |
b0699dad | 107 | |
a1105617 | 108 | /* File is a PCH (on return from find_include_file). */ |
22234f56 | 109 | bool pch; |
8f9b4009 | 110 | }; |
d4506961 | 111 | |
8f9b4009 NB |
112 | /* A singly-linked list for all searches for a given file name, with |
113 | its head pointed to by a slot in FILE_HASH. The file name is what | |
114 | appeared between the quotes in a #include directive; it can be | |
a98ebe2e | 115 | determined implicitly from the hash table location or explicitly |
bf42e45b | 116 | from FILE->name. |
8f9b4009 NB |
117 | |
118 | FILE is a structure containing details about the file that was | |
119 | found with that search, or details of how the search failed. | |
120 | ||
121 | START_DIR is the starting location of the search in the include | |
122 | chain. The current directories for "" includes are also hashed in | |
bf42e45b NB |
123 | the hash table and therefore unique. Files that are looked up |
124 | without using a search path, such as absolute filenames and file | |
125 | names from the command line share a special starting directory so | |
126 | they don't cause cache hits with normal include-chain lookups. | |
8f9b4009 NB |
127 | |
128 | If START_DIR is NULL then the entry is for a directory, not a file, | |
129 | and the directory is in DIR. Since the starting point in a file | |
130 | lookup chain is never NULL, this means that simple pointer | |
131 | comparisons against START_DIR can be made to determine cache hits | |
132 | in file lookups. | |
bf42e45b NB |
133 | |
134 | If a cache lookup fails because of e.g. an extra "./" in the path, | |
135 | then nothing will break. It is just less efficient as CPP will | |
136 | have to do more work re-preprocessing the file, and/or comparing | |
137 | its contents against earlier once-only files. | |
8f9b4009 NB |
138 | */ |
139 | struct file_hash_entry | |
140 | { | |
141 | struct file_hash_entry *next; | |
142 | cpp_dir *start_dir; | |
143 | union | |
144 | { | |
145 | _cpp_file *file; | |
146 | cpp_dir *dir; | |
147 | } u; | |
148 | }; | |
149 | ||
150 | static bool open_file (_cpp_file *file); | |
3d67ba1e GK |
151 | static bool pch_open_file (cpp_reader *pfile, _cpp_file *file, |
152 | bool *invalid_pch); | |
153 | static bool find_file_in_dir (cpp_reader *pfile, _cpp_file *file, | |
154 | bool *invalid_pch); | |
8f9b4009 NB |
155 | static bool read_file_guts (cpp_reader *pfile, _cpp_file *file); |
156 | static bool read_file (cpp_reader *pfile, _cpp_file *file); | |
cf1ee30c | 157 | static bool should_stack_file (cpp_reader *, _cpp_file *file, bool import); |
8f9b4009 NB |
158 | static struct cpp_dir *search_path_head (cpp_reader *, const char *fname, |
159 | int angle_brackets, enum include_type); | |
160 | static const char *dir_name_of_file (_cpp_file *file); | |
6568f34b | 161 | static void open_file_failed (cpp_reader *pfile, _cpp_file *file, int); |
e83d8d43 | 162 | static struct file_hash_entry *search_cache (struct file_hash_entry *head, |
8f9b4009 NB |
163 | const cpp_dir *start_dir); |
164 | static _cpp_file *make_cpp_file (cpp_reader *, cpp_dir *, const char *fname); | |
1b449375 | 165 | static void destroy_cpp_file (_cpp_file *); |
8f9b4009 NB |
166 | static cpp_dir *make_cpp_dir (cpp_reader *, const char *dir_name, int sysp); |
167 | static void allocate_file_hash_entries (cpp_reader *pfile); | |
168 | static struct file_hash_entry *new_file_hash_entry (cpp_reader *pfile); | |
169 | static int report_missing_guard (void **slot, void *b); | |
b92be669 PB |
170 | static hashval_t file_hash_hash (const void *p); |
171 | static int file_hash_eq (const void *p, const void *q); | |
8f9b4009 NB |
172 | static char *read_filename_string (int ch, FILE *f); |
173 | static void read_name_map (cpp_dir *dir); | |
174 | static char *remap_filename (cpp_reader *pfile, _cpp_file *file); | |
175 | static char *append_file_to_dir (const char *fname, cpp_dir *dir); | |
176 | static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname); | |
73e61092 GK |
177 | static int pchf_save_compare (const void *e1, const void *e2); |
178 | static int pchf_compare (const void *d_p, const void *e_p); | |
179 | static bool check_file_against_entries (cpp_reader *, _cpp_file *, bool); | |
8f9b4009 NB |
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 | ||
3d67ba1e GK |
237 | /* Temporary PCH intercept of opening a file. Try to find a PCH file |
238 | based on FILE->name and FILE->dir, and test those found for | |
239 | validity using PFILE->cb.valid_pch. Return true iff a valid file is | |
240 | found. Set *INVALID_PCH if a PCH file is found but wasn't valid. */ | |
241 | ||
8f9b4009 | 242 | static bool |
3d67ba1e | 243 | pch_open_file (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) |
17211ab5 | 244 | { |
8f9b4009 NB |
245 | static const char extension[] = ".gch"; |
246 | const char *path = file->path; | |
247 | size_t len, flen; | |
248 | char *pchname; | |
249 | struct stat st; | |
250 | bool valid = false; | |
251 | ||
252 | /* No PCH on <stdin> or if not requested. */ | |
253 | if (file->name[0] == '\0' || !pfile->cb.valid_pch) | |
254 | return false; | |
17211ab5 | 255 | |
8f9b4009 NB |
256 | flen = strlen (path); |
257 | len = flen + sizeof (extension); | |
c3f829c1 | 258 | pchname = XNEWVEC (char, len); |
8f9b4009 NB |
259 | memcpy (pchname, path, flen); |
260 | memcpy (pchname + flen, extension, sizeof (extension)); | |
17211ab5 | 261 | |
8f9b4009 | 262 | if (stat (pchname, &st) == 0) |
17211ab5 | 263 | { |
8f9b4009 NB |
264 | DIR *pchdir; |
265 | struct dirent *d; | |
266 | size_t dlen, plen = len; | |
267 | ||
268 | if (!S_ISDIR (st.st_mode)) | |
269 | valid = validate_pch (pfile, file, pchname); | |
270 | else if ((pchdir = opendir (pchname)) != NULL) | |
17211ab5 | 271 | { |
8f9b4009 NB |
272 | pchname[plen - 1] = '/'; |
273 | while ((d = readdir (pchdir)) != NULL) | |
8d973a83 | 274 | { |
8f9b4009 | 275 | dlen = strlen (d->d_name) + 1; |
230fcd32 PE |
276 | if ((strcmp (d->d_name, ".") == 0) |
277 | || (strcmp (d->d_name, "..") == 0)) | |
278 | continue; | |
8f9b4009 | 279 | if (dlen + plen > len) |
17211ab5 | 280 | { |
8f9b4009 | 281 | len += dlen + 64; |
c3f829c1 | 282 | pchname = XRESIZEVEC (char, pchname, len); |
17211ab5 | 283 | } |
8f9b4009 NB |
284 | memcpy (pchname + plen, d->d_name, dlen); |
285 | valid = validate_pch (pfile, file, pchname); | |
286 | if (valid) | |
8d973a83 | 287 | break; |
17211ab5 | 288 | } |
8f9b4009 | 289 | closedir (pchdir); |
17211ab5 | 290 | } |
bcad4ca2 RS |
291 | if (valid) |
292 | file->pch = true; | |
293 | else | |
294 | *invalid_pch = true; | |
17211ab5 | 295 | } |
8d973a83 | 296 | |
8f9b4009 NB |
297 | if (valid) |
298 | file->pchname = pchname; | |
299 | else | |
300 | free (pchname); | |
301 | ||
302 | return valid; | |
17211ab5 GK |
303 | } |
304 | ||
8f9b4009 | 305 | /* Try to open the path FILE->name appended to FILE->dir. This is |
cf1ee30c | 306 | where remap and PCH intercept the file lookup process. Return true |
16dd5cfe | 307 | if the file was found, whether or not the open was successful. |
3d67ba1e GK |
308 | Set *INVALID_PCH to true if a PCH file is found but wasn't valid. */ |
309 | ||
e5eba70a | 310 | static bool |
3d67ba1e | 311 | find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) |
a58d32c2 | 312 | { |
8f9b4009 | 313 | char *path; |
51d0f328 | 314 | |
8f9b4009 NB |
315 | if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file))) |
316 | ; | |
317 | else | |
94d1613b MS |
318 | if (file->dir->construct) |
319 | path = file->dir->construct (file->name, file->dir); | |
320 | else | |
321 | path = append_file_to_dir (file->name, file->dir); | |
e5eba70a | 322 | |
94d1613b MS |
323 | if (path) |
324 | { | |
325 | file->path = path; | |
326 | if (pch_open_file (pfile, file, invalid_pch)) | |
327 | return true; | |
51d0f328 | 328 | |
94d1613b MS |
329 | if (open_file (file)) |
330 | return true; | |
331 | ||
332 | if (file->err_no != ENOENT) | |
333 | { | |
6568f34b | 334 | open_file_failed (pfile, file, 0); |
94d1613b MS |
335 | return true; |
336 | } | |
337 | ||
338 | free (path); | |
339 | file->path = file->name; | |
340 | } | |
341 | else | |
342 | { | |
343 | file->err_no = ENOENT; | |
344 | file->path = NULL; | |
345 | } | |
346 | ||
347 | return false; | |
348 | } | |
51d0f328 | 349 | |
94d1613b MS |
350 | /* Return tue iff the missing_header callback found the given HEADER. */ |
351 | static bool | |
352 | search_path_exhausted (cpp_reader *pfile, const char *header, _cpp_file *file) | |
353 | { | |
354 | missing_header_cb func = pfile->cb.missing_header; | |
355 | ||
356 | /* When the regular search path doesn't work, try context dependent | |
357 | headers search paths. */ | |
358 | if (func | |
359 | && file->dir == NULL) | |
cf1ee30c | 360 | { |
e3c287c9 | 361 | if ((file->path = func (pfile, header, &file->dir)) != NULL) |
94d1613b MS |
362 | { |
363 | if (open_file (file)) | |
364 | return true; | |
365 | free ((void *)file->path); | |
366 | } | |
367 | file->path = file->name; | |
cf1ee30c NB |
368 | } |
369 | ||
8f9b4009 NB |
370 | return false; |
371 | } | |
372 | ||
4dc299fb PB |
373 | bool |
374 | _cpp_find_failed (_cpp_file *file) | |
375 | { | |
376 | return file->err_no != 0; | |
377 | } | |
378 | ||
8f9b4009 NB |
379 | /* Given a filename FNAME search for such a file in the include path |
380 | starting from START_DIR. If FNAME is the empty string it is | |
1ae58c30 | 381 | interpreted as STDIN if START_DIR is PFILE->no_search_path. |
8f9b4009 NB |
382 | |
383 | If the file is not found in the file cache fall back to the O/S and | |
384 | add the result to our cache. | |
385 | ||
386 | If the file was not found in the filesystem, or there was an error | |
02fa63cd | 387 | opening it, then ERR_NO is nonzero and FD is -1. If the file was |
8f9b4009 NB |
388 | found, then ERR_NO is zero and FD could be -1 or an open file |
389 | descriptor. FD can be -1 if the file was found in the cache and | |
390 | had previously been closed. To open it again pass the return value | |
391 | to open_file(). | |
392 | */ | |
4dc299fb | 393 | _cpp_file * |
6568f34b | 394 | _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, bool fake, int angle_brackets) |
8f9b4009 NB |
395 | { |
396 | struct file_hash_entry *entry, **hash_slot; | |
397 | _cpp_file *file; | |
3d67ba1e | 398 | bool invalid_pch = false; |
8f9b4009 NB |
399 | |
400 | /* Ensure we get no confusion between cached files and directories. */ | |
401 | if (start_dir == NULL) | |
0527bc4e | 402 | cpp_error (pfile, CPP_DL_ICE, "NULL directory in find_file"); |
8f9b4009 NB |
403 | |
404 | hash_slot = (struct file_hash_entry **) | |
b92be669 PB |
405 | htab_find_slot_with_hash (pfile->file_hash, fname, |
406 | htab_hash_string (fname), | |
407 | INSERT); | |
17211ab5 | 408 | |
8f9b4009 | 409 | /* First check the cache before we resort to memory allocation. */ |
e83d8d43 | 410 | entry = search_cache (*hash_slot, start_dir); |
8f9b4009 NB |
411 | if (entry) |
412 | return entry->u.file; | |
413 | ||
414 | file = make_cpp_file (pfile, start_dir, fname); | |
415 | ||
416 | /* Try each path in the include chain. */ | |
417 | for (; !fake ;) | |
7c092714 | 418 | { |
3d67ba1e | 419 | if (find_file_in_dir (pfile, file, &invalid_pch)) |
8f9b4009 NB |
420 | break; |
421 | ||
cf1ee30c NB |
422 | file->dir = file->dir->next; |
423 | if (file->dir == NULL) | |
e5eba70a | 424 | { |
94d1613b | 425 | if (search_path_exhausted (pfile, fname, file)) |
942926ad GK |
426 | { |
427 | /* Although this file must not go in the cache, because | |
428 | the file found might depend on things (like the current file) | |
429 | that aren't represented in the cache, it still has to go in | |
430 | the list of all files so that #import works. */ | |
431 | file->next_file = pfile->all_files; | |
432 | pfile->all_files = file; | |
433 | return file; | |
434 | } | |
94d1613b | 435 | |
6568f34b | 436 | open_file_failed (pfile, file, angle_brackets); |
3d67ba1e GK |
437 | if (invalid_pch) |
438 | { | |
16dd5cfe | 439 | cpp_error (pfile, CPP_DL_ERROR, |
e235d8bf GK |
440 | "one or more PCH files were found, but they were invalid"); |
441 | if (!cpp_get_options (pfile)->warn_invalid_pch) | |
16dd5cfe | 442 | cpp_error (pfile, CPP_DL_ERROR, |
e235d8bf | 443 | "use -Winvalid-pch for more information"); |
3d67ba1e | 444 | } |
8f9b4009 | 445 | break; |
e5eba70a | 446 | } |
49634b3a | 447 | |
f5eab47e JJ |
448 | /* Only check the cache for the starting location (done above) |
449 | and the quote and bracket chain heads because there are no | |
450 | other possible starting points for searches. */ | |
451 | if (file->dir != pfile->bracket_include | |
452 | && file->dir != pfile->quote_include) | |
453 | continue; | |
eb1f4d9d | 454 | |
f5eab47e JJ |
455 | entry = search_cache (*hash_slot, file->dir); |
456 | if (entry) | |
457 | break; | |
458 | } | |
c6e83800 | 459 | |
f5eab47e JJ |
460 | if (entry) |
461 | { | |
462 | /* Cache for START_DIR too, sharing the _cpp_file structure. */ | |
463 | free ((char *) file->name); | |
464 | free (file); | |
465 | file = entry->u.file; | |
466 | } | |
467 | else | |
468 | { | |
469 | /* This is a new file; put it in the list. */ | |
470 | file->next_file = pfile->all_files; | |
471 | pfile->all_files = file; | |
c6e83800 ZW |
472 | } |
473 | ||
8f9b4009 NB |
474 | /* Store this new result in the hash table. */ |
475 | entry = new_file_hash_entry (pfile); | |
476 | entry->next = *hash_slot; | |
477 | entry->start_dir = start_dir; | |
478 | entry->u.file = file; | |
479 | *hash_slot = entry; | |
e5eba70a | 480 | |
8f9b4009 | 481 | return file; |
a58d32c2 ZW |
482 | } |
483 | ||
8f9b4009 | 484 | /* Read a file into FILE->buffer, returning true on success. |
a58d32c2 | 485 | |
8f9b4009 NB |
486 | If FILE->fd is something weird, like a block device, we don't want |
487 | to read it at all. Don't even try to figure out what something is, | |
488 | except for plain files and block devices, since there is no | |
489 | reliable portable way of doing this. | |
a58d32c2 ZW |
490 | |
491 | FIXME: Flush file cache and try again if we run out of memory. */ | |
8f9b4009 NB |
492 | static bool |
493 | read_file_guts (cpp_reader *pfile, _cpp_file *file) | |
a58d32c2 | 494 | { |
8f9b4009 | 495 | ssize_t size, total, count; |
562a5c27 | 496 | uchar *buf; |
8f9b4009 | 497 | bool regular; |
16dd5cfe | 498 | |
8f9b4009 NB |
499 | if (S_ISBLK (file->st.st_mode)) |
500 | { | |
0527bc4e | 501 | cpp_error (pfile, CPP_DL_ERROR, "%s is a block device", file->path); |
8f9b4009 NB |
502 | return false; |
503 | } | |
a58d32c2 | 504 | |
8f9b4009 NB |
505 | regular = S_ISREG (file->st.st_mode); |
506 | if (regular) | |
f2d5f0cc | 507 | { |
a58d32c2 ZW |
508 | /* off_t might have a wider range than ssize_t - in other words, |
509 | the max size of a file might be bigger than the address | |
510 | space. We can't handle a file that large. (Anyone with | |
511 | a single source file bigger than 2GB needs to rethink | |
512 | their coding style.) Some systems (e.g. AIX 4.1) define | |
513 | SSIZE_MAX to be much smaller than the actual range of the | |
514 | type. Use INTTYPE_MAXIMUM unconditionally to ensure this | |
515 | does not bite us. */ | |
8f9b4009 | 516 | if (file->st.st_size > INTTYPE_MAXIMUM (ssize_t)) |
f2d5f0cc | 517 | { |
0527bc4e | 518 | cpp_error (pfile, CPP_DL_ERROR, "%s is too large", file->path); |
8f9b4009 | 519 | return false; |
f2d5f0cc | 520 | } |
a58d32c2 | 521 | |
8f9b4009 NB |
522 | size = file->st.st_size; |
523 | } | |
524 | else | |
525 | /* 8 kilobytes is a sensible starting size. It ought to be bigger | |
526 | than the kernel pipe buffer, and it's definitely bigger than | |
527 | the majority of C source files. */ | |
528 | size = 8 * 1024; | |
529 | ||
c3f829c1 | 530 | buf = XNEWVEC (uchar, size + 1); |
8f9b4009 NB |
531 | total = 0; |
532 | while ((count = read (file->fd, buf + total, size - total)) > 0) | |
533 | { | |
534 | total += count; | |
535 | ||
536 | if (total == size) | |
d4506961 | 537 | { |
8f9b4009 NB |
538 | if (regular) |
539 | break; | |
540 | size *= 2; | |
c3f829c1 | 541 | buf = XRESIZEVEC (uchar, buf, size + 1); |
d4506961 | 542 | } |
a58d32c2 | 543 | } |
8f9b4009 NB |
544 | |
545 | if (count < 0) | |
a58d32c2 | 546 | { |
0527bc4e | 547 | cpp_errno (pfile, CPP_DL_ERROR, file->path); |
8f9b4009 | 548 | return false; |
a58d32c2 | 549 | } |
8f9b4009 NB |
550 | |
551 | if (regular && total != size && STAT_SIZE_RELIABLE (file->st)) | |
0527bc4e JDA |
552 | cpp_error (pfile, CPP_DL_WARNING, |
553 | "%s is shorter than expected", file->path); | |
8f9b4009 | 554 | |
16dd5cfe EC |
555 | file->buffer = _cpp_convert_input (pfile, CPP_OPTION (pfile, input_charset), |
556 | buf, size, total, &file->st.st_size); | |
8f9b4009 NB |
557 | file->buffer_valid = true; |
558 | ||
559 | return true; | |
560 | } | |
561 | ||
562 | /* Convenience wrapper around read_file_guts that opens the file if | |
a98ebe2e | 563 | necessary and closes the file descriptor after reading. FILE must |
8f9b4009 NB |
564 | have been passed through find_file() at some stage. */ |
565 | static bool | |
566 | read_file (cpp_reader *pfile, _cpp_file *file) | |
567 | { | |
8f9b4009 NB |
568 | /* If we already have its contents in memory, succeed immediately. */ |
569 | if (file->buffer_valid) | |
570 | return true; | |
a58d32c2 | 571 | |
8f9b4009 NB |
572 | /* If an earlier read failed for some reason don't try again. */ |
573 | if (file->dont_read || file->err_no) | |
574 | return false; | |
4d6baafa | 575 | |
8f9b4009 NB |
576 | if (file->fd == -1 && !open_file (file)) |
577 | { | |
6568f34b | 578 | open_file_failed (pfile, file, 0); |
8f9b4009 | 579 | return false; |
f2d5f0cc | 580 | } |
d7a2e0f7 | 581 | |
8f9b4009 NB |
582 | file->dont_read = !read_file_guts (pfile, file); |
583 | close (file->fd); | |
584 | file->fd = -1; | |
a58d32c2 | 585 | |
8f9b4009 | 586 | return !file->dont_read; |
a58d32c2 ZW |
587 | } |
588 | ||
cf1ee30c NB |
589 | /* Returns TRUE if FILE's contents have been successfully placed in |
590 | FILE->buffer and the file should be stacked, otherwise false. */ | |
8f9b4009 | 591 | static bool |
cf1ee30c | 592 | should_stack_file (cpp_reader *pfile, _cpp_file *file, bool import) |
a58d32c2 | 593 | { |
cf1ee30c | 594 | _cpp_file *f; |
8f9b4009 | 595 | |
49634b3a NB |
596 | /* Skip once-only files. */ |
597 | if (file->once_only) | |
598 | return false; | |
599 | ||
16dd5cfe | 600 | /* We must mark the file once-only if #import now, before header |
49634b3a NB |
601 | guard checks. Otherwise, undefining the header guard might |
602 | cause the file to be re-stacked. */ | |
603 | if (import) | |
604 | { | |
605 | _cpp_mark_file_once_only (pfile, file); | |
606 | ||
607 | /* Don't stack files that have been stacked before. */ | |
608 | if (file->stack_count) | |
609 | return false; | |
610 | } | |
611 | ||
cf1ee30c NB |
612 | /* Skip if the file had a header guard and the macro is defined. |
613 | PCH relies on this appearing before the PCH handler below. */ | |
614 | if (file->cmacro && file->cmacro->type == NT_MACRO) | |
bf42e45b NB |
615 | return false; |
616 | ||
cf1ee30c | 617 | /* Handle PCH files immediately; don't stack them. */ |
22234f56 | 618 | if (file->pch) |
c31a6508 | 619 | { |
c0d578e6 | 620 | pfile->cb.read_pch (pfile, file->pchname, file->fd, file->path); |
cf1ee30c NB |
621 | close (file->fd); |
622 | file->fd = -1; | |
623 | return false; | |
c31a6508 | 624 | } |
8f9b4009 | 625 | |
8f9b4009 NB |
626 | if (!read_file (pfile, file)) |
627 | return false; | |
c31a6508 | 628 | |
73e61092 GK |
629 | /* Check the file against the PCH file. This is done before |
630 | checking against files we've already seen, since it may save on | |
631 | I/O. */ | |
632 | if (check_file_against_entries (pfile, file, import)) | |
633 | { | |
634 | /* If this isn't a #import, but yet we can't include the file, | |
635 | that means that it was #import-ed in the PCH file, | |
636 | so we can never include it again. */ | |
637 | if (! import) | |
638 | _cpp_mark_file_once_only (pfile, file); | |
639 | return false; | |
640 | } | |
641 | ||
49634b3a NB |
642 | /* Now we've read the file's contents, we can stack it if there |
643 | are no once-only files. */ | |
644 | if (!pfile->seen_once_only) | |
cf1ee30c NB |
645 | return true; |
646 | ||
49634b3a | 647 | /* We may have read the file under a different name. Look |
8f9b4009 | 648 | for likely candidates and compare file contents to be sure. */ |
49634b3a | 649 | for (f = pfile->all_files; f; f = f->next_file) |
8f9b4009 NB |
650 | { |
651 | if (f == file) | |
652 | continue; | |
653 | ||
49634b3a NB |
654 | if ((import || f->once_only) |
655 | && f->err_no == 0 | |
8f9b4009 | 656 | && f->st.st_mtime == file->st.st_mtime |
1b449375 EB |
657 | && f->st.st_size == file->st.st_size) |
658 | { | |
659 | _cpp_file *ref_file; | |
660 | bool same_file_p = false; | |
661 | ||
662 | if (f->buffer && !f->buffer_valid) | |
663 | { | |
664 | /* We already have a buffer but it is not valid, because | |
665 | the file is still stacked. Make a new one. */ | |
666 | ref_file = make_cpp_file (pfile, f->dir, f->name); | |
667 | ref_file->path = f->path; | |
668 | } | |
669 | else | |
670 | /* The file is not stacked anymore. We can reuse it. */ | |
671 | ref_file = f; | |
672 | ||
673 | same_file_p = read_file (pfile, ref_file) | |
674 | /* Size might have changed in read_file(). */ | |
675 | && ref_file->st.st_size == file->st.st_size | |
676 | && !memcmp (ref_file->buffer, | |
677 | file->buffer, | |
678 | file->st.st_size); | |
679 | ||
680 | if (f->buffer && !f->buffer_valid) | |
681 | { | |
682 | ref_file->path = 0; | |
683 | destroy_cpp_file (ref_file); | |
684 | } | |
685 | ||
686 | if (same_file_p) | |
687 | break; | |
688 | } | |
0b3d776a | 689 | } |
8f9b4009 | 690 | |
cf1ee30c NB |
691 | return f == NULL; |
692 | } | |
693 | ||
694 | /* Place the file referenced by FILE into a new buffer on the buffer | |
695 | stack if possible. IMPORT is true if this stacking attempt is | |
696 | because of a #import directive. Returns true if a buffer is | |
697 | stacked. */ | |
4dc299fb PB |
698 | bool |
699 | _cpp_stack_file (cpp_reader *pfile, _cpp_file *file, bool import) | |
cf1ee30c NB |
700 | { |
701 | cpp_buffer *buffer; | |
702 | int sysp; | |
703 | ||
704 | if (!should_stack_file (pfile, file, import)) | |
705 | return false; | |
706 | ||
12f9df4e PB |
707 | if (pfile->buffer == NULL || file->dir == NULL) |
708 | sysp = 0; | |
709 | else | |
710 | sysp = MAX (pfile->buffer->sysp, file->dir->sysp); | |
cf1ee30c NB |
711 | |
712 | /* Add the file to the dependencies on its first inclusion. */ | |
713 | if (CPP_OPTION (pfile, deps.style) > !!sysp && !file->stack_count) | |
714 | { | |
715 | if (!file->main_file || !CPP_OPTION (pfile, deps.ignore_main_file)) | |
716 | deps_add_dep (pfile->deps, file->path); | |
717 | } | |
718 | ||
719 | /* Clear buffer_valid since _cpp_clean_line messes it up. */ | |
720 | file->buffer_valid = false; | |
721 | file->stack_count++; | |
722 | ||
723 | /* Stack the buffer. */ | |
724 | buffer = cpp_push_buffer (pfile, file->buffer, file->st.st_size, | |
4dc299fb | 725 | CPP_OPTION (pfile, preprocessed)); |
cf1ee30c | 726 | buffer->file = file; |
12f9df4e | 727 | buffer->sysp = sysp; |
cf1ee30c NB |
728 | |
729 | /* Initialize controlling macro state. */ | |
730 | pfile->mi_valid = true; | |
731 | pfile->mi_cmacro = 0; | |
732 | ||
733 | /* Generate the call back. */ | |
76bf2c97 | 734 | _cpp_do_file_change (pfile, LC_ENTER, file->path, 1, sysp); |
cf1ee30c NB |
735 | |
736 | return true; | |
add7091b ZW |
737 | } |
738 | ||
49634b3a | 739 | /* Mark FILE to be included once only. */ |
8f9b4009 | 740 | void |
49634b3a | 741 | _cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file) |
f2d5f0cc | 742 | { |
49634b3a NB |
743 | pfile->seen_once_only = true; |
744 | file->once_only = true; | |
8f9b4009 NB |
745 | } |
746 | ||
747 | /* Return the directory from which searching for FNAME should start, | |
2067c116 | 748 | considering the directive TYPE and ANGLE_BRACKETS. If there is |
8f9b4009 NB |
749 | nothing left in the path, returns NULL. */ |
750 | static struct cpp_dir * | |
751 | search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets, | |
752 | enum include_type type) | |
753 | { | |
754 | cpp_dir *dir; | |
755 | _cpp_file *file; | |
74eb4b3e | 756 | |
3dce1408 | 757 | if (IS_ABSOLUTE_PATH (fname)) |
8f9b4009 NB |
758 | return &pfile->no_search_path; |
759 | ||
4dc299fb PB |
760 | /* pfile->buffer is NULL when processing an -include command-line flag. */ |
761 | file = pfile->buffer == NULL ? pfile->main_file : pfile->buffer->file; | |
41947a54 NB |
762 | |
763 | /* For #include_next, skip in the search path past the dir in which | |
e7182666 NB |
764 | the current file was found, but if it was found via an absolute |
765 | path use the normal search logic. */ | |
8f9b4009 NB |
766 | if (type == IT_INCLUDE_NEXT && file->dir) |
767 | dir = file->dir->next; | |
74eb4b3e | 768 | else if (angle_brackets) |
8f9b4009 NB |
769 | dir = pfile->bracket_include; |
770 | else if (type == IT_CMDLINE) | |
771 | /* -include and -imacros use the #include "" chain with the | |
772 | preprocessor's cwd prepended. */ | |
773 | return make_cpp_dir (pfile, "./", false); | |
774 | else if (pfile->quote_ignores_source_dir) | |
775 | dir = pfile->quote_include; | |
41947a54 | 776 | else |
12f9df4e PB |
777 | return make_cpp_dir (pfile, dir_name_of_file (file), |
778 | pfile->buffer ? pfile->buffer->sysp : 0); | |
8f9b4009 NB |
779 | |
780 | if (dir == NULL) | |
0527bc4e | 781 | cpp_error (pfile, CPP_DL_ERROR, |
8f9b4009 NB |
782 | "no include path in which to search for %s", fname); |
783 | ||
784 | return dir; | |
785 | } | |
41947a54 | 786 | |
8f9b4009 | 787 | /* Strip the basename from the file's path. It ends with a slash if |
02fa63cd | 788 | of nonzero length. Note that this procedure also works for |
8f9b4009 NB |
789 | <stdin>, which is represented by the empty string. */ |
790 | static const char * | |
791 | dir_name_of_file (_cpp_file *file) | |
792 | { | |
793 | if (!file->dir_name) | |
41947a54 | 794 | { |
8f9b4009 | 795 | size_t len = lbasename (file->path) - file->path; |
c3f829c1 | 796 | char *dir_name = XNEWVEC (char, len + 1); |
8f9b4009 NB |
797 | |
798 | memcpy (dir_name, file->path, len); | |
799 | dir_name[len] = '\0'; | |
800 | file->dir_name = dir_name; | |
41947a54 NB |
801 | } |
802 | ||
8f9b4009 NB |
803 | return file->dir_name; |
804 | } | |
805 | ||
8f9b4009 NB |
806 | /* Handles #include-family directives (distinguished by TYPE), |
807 | including HEADER, and the command line -imacros and -include. | |
808 | Returns true if a buffer was stacked. */ | |
809 | bool | |
810 | _cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets, | |
811 | enum include_type type) | |
812 | { | |
813 | struct cpp_dir *dir; | |
22234f56 | 814 | _cpp_file *file; |
8f9b4009 NB |
815 | |
816 | dir = search_path_head (pfile, fname, angle_brackets, type); | |
817 | if (!dir) | |
818 | return false; | |
819 | ||
6568f34b | 820 | file = _cpp_find_file (pfile, fname, dir, false, angle_brackets); |
22234f56 PB |
821 | |
822 | /* Compensate for the increment in linemap_add. In the case of a | |
823 | normal #include, we're currently at the start of the line | |
824 | *following* the #include. A separate source_location for this | |
825 | location makes no sense (until we do the LC_LEAVE), and | |
826 | complicates LAST_SOURCE_LINE_LOCATION. This does not apply if we | |
827 | found a PCH file (in which case linemap_add is not called) or we | |
828 | were included from the command-line. */ | |
829 | if (! file->pch && file->err_no == 0 && type != IT_CMDLINE) | |
830 | pfile->line_table->highest_location--; | |
831 | ||
832 | return _cpp_stack_file (pfile, file, type == IT_IMPORT); | |
8f9b4009 NB |
833 | } |
834 | ||
835 | /* Could not open FILE. The complication is dependency output. */ | |
836 | static void | |
6568f34b | 837 | open_file_failed (cpp_reader *pfile, _cpp_file *file, int angle_brackets) |
8f9b4009 | 838 | { |
500bee0a | 839 | int sysp = pfile->line_table->highest_line > 1 && pfile->buffer ? pfile->buffer->sysp : 0; |
6568f34b | 840 | bool print_dep = CPP_OPTION (pfile, deps.style) > (angle_brackets || !!sysp); |
8f9b4009 NB |
841 | |
842 | errno = file->err_no; | |
843 | if (print_dep && CPP_OPTION (pfile, deps.missing_files) && errno == ENOENT) | |
bf42e45b | 844 | deps_add_dep (pfile->deps, file->name); |
8f9b4009 | 845 | else |
add7091b | 846 | { |
8f9b4009 NB |
847 | /* If we are outputting dependencies but not for this file then |
848 | don't error because we can still produce correct output. */ | |
849 | if (CPP_OPTION (pfile, deps.style) && ! print_dep) | |
0527bc4e | 850 | cpp_errno (pfile, CPP_DL_WARNING, file->path); |
e7182666 | 851 | else |
0527bc4e | 852 | cpp_errno (pfile, CPP_DL_ERROR, file->path); |
add7091b | 853 | } |
8f9b4009 | 854 | } |
591e15a1 | 855 | |
8f9b4009 NB |
856 | /* Search in the chain beginning at HEAD for a file whose search path |
857 | started at START_DIR != NULL. */ | |
858 | static struct file_hash_entry * | |
e83d8d43 | 859 | search_cache (struct file_hash_entry *head, const cpp_dir *start_dir) |
8f9b4009 | 860 | { |
f5eab47e JJ |
861 | while (head && head->start_dir != start_dir) |
862 | head = head->next; | |
863 | ||
864 | return head; | |
8f9b4009 NB |
865 | } |
866 | ||
867 | /* Allocate a new _cpp_file structure. */ | |
868 | static _cpp_file * | |
869 | make_cpp_file (cpp_reader *pfile, cpp_dir *dir, const char *fname) | |
870 | { | |
871 | _cpp_file *file; | |
872 | ||
c3f829c1 | 873 | file = XCNEW (_cpp_file); |
8f9b4009 NB |
874 | file->main_file = !pfile->buffer; |
875 | file->fd = -1; | |
876 | file->dir = dir; | |
877 | file->name = xstrdup (fname); | |
878 | ||
879 | return file; | |
880 | } | |
881 | ||
1b449375 EB |
882 | /* Release a _cpp_file structure. */ |
883 | static void | |
884 | destroy_cpp_file (_cpp_file *file) | |
885 | { | |
886 | if (file->buffer) | |
887 | free ((void *) file->buffer); | |
888 | free ((void *) file->name); | |
889 | free (file); | |
890 | } | |
891 | ||
8f9b4009 NB |
892 | /* A hash of directory names. The directory names are the path names |
893 | of files which contain a #include "", the included file name is | |
894 | appended to this directories. | |
895 | ||
896 | To avoid duplicate entries we follow the convention that all | |
897 | non-empty directory names should end in a '/'. DIR_NAME must be | |
898 | stored in permanently allocated memory. */ | |
899 | static cpp_dir * | |
900 | make_cpp_dir (cpp_reader *pfile, const char *dir_name, int sysp) | |
901 | { | |
902 | struct file_hash_entry *entry, **hash_slot; | |
903 | cpp_dir *dir; | |
904 | ||
905 | hash_slot = (struct file_hash_entry **) | |
a23ee064 | 906 | htab_find_slot_with_hash (pfile->dir_hash, dir_name, |
b92be669 PB |
907 | htab_hash_string (dir_name), |
908 | INSERT); | |
8f9b4009 NB |
909 | |
910 | /* Have we already hashed this directory? */ | |
911 | for (entry = *hash_slot; entry; entry = entry->next) | |
912 | if (entry->start_dir == NULL) | |
913 | return entry->u.dir; | |
914 | ||
c3f829c1 | 915 | dir = XCNEW (cpp_dir); |
8f9b4009 NB |
916 | dir->next = pfile->quote_include; |
917 | dir->name = (char *) dir_name; | |
918 | dir->len = strlen (dir_name); | |
919 | dir->sysp = sysp; | |
94d1613b | 920 | dir->construct = 0; |
8f9b4009 NB |
921 | |
922 | /* Store this new result in the hash table. */ | |
923 | entry = new_file_hash_entry (pfile); | |
924 | entry->next = *hash_slot; | |
925 | entry->start_dir = NULL; | |
926 | entry->u.dir = dir; | |
927 | *hash_slot = entry; | |
928 | ||
929 | return dir; | |
930 | } | |
931 | ||
932 | /* Create a new block of memory for file hash entries. */ | |
933 | static void | |
934 | allocate_file_hash_entries (cpp_reader *pfile) | |
935 | { | |
936 | pfile->file_hash_entries_used = 0; | |
937 | pfile->file_hash_entries_allocated = 127; | |
c3f829c1 GDR |
938 | pfile->file_hash_entries = XNEWVEC (struct file_hash_entry, |
939 | pfile->file_hash_entries_allocated); | |
8f9b4009 NB |
940 | } |
941 | ||
942 | /* Return a new file hash entry. */ | |
943 | static struct file_hash_entry * | |
944 | new_file_hash_entry (cpp_reader *pfile) | |
945 | { | |
946 | if (pfile->file_hash_entries_used == pfile->file_hash_entries_allocated) | |
947 | allocate_file_hash_entries (pfile); | |
948 | ||
949 | return &pfile->file_hash_entries[pfile->file_hash_entries_used++]; | |
950 | } | |
951 | ||
952 | /* Returns TRUE if a file FNAME has ever been successfully opened. | |
953 | This routine is not intended to correctly handle filenames aliased | |
954 | by links or redundant . or .. traversals etc. */ | |
955 | bool | |
956 | cpp_included (cpp_reader *pfile, const char *fname) | |
957 | { | |
958 | struct file_hash_entry *entry; | |
959 | ||
c3f829c1 GDR |
960 | entry = (struct file_hash_entry *) |
961 | htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname)); | |
8f9b4009 NB |
962 | |
963 | while (entry && (entry->start_dir == NULL || entry->u.file->err_no)) | |
964 | entry = entry->next; | |
965 | ||
966 | return entry != NULL; | |
967 | } | |
968 | ||
6614fd40 | 969 | /* Calculate the hash value of a file hash entry P. */ |
b92be669 PB |
970 | |
971 | static hashval_t | |
972 | file_hash_hash (const void *p) | |
973 | { | |
974 | struct file_hash_entry *entry = (struct file_hash_entry *) p; | |
975 | const char *hname; | |
976 | if (entry->start_dir) | |
977 | hname = entry->u.file->name; | |
978 | else | |
979 | hname = entry->u.dir->name; | |
980 | ||
981 | return htab_hash_string (hname); | |
982 | } | |
983 | ||
8f9b4009 NB |
984 | /* Compare a string Q against a file hash entry P. */ |
985 | static int | |
b92be669 | 986 | file_hash_eq (const void *p, const void *q) |
8f9b4009 NB |
987 | { |
988 | struct file_hash_entry *entry = (struct file_hash_entry *) p; | |
989 | const char *fname = (const char *) q; | |
990 | const char *hname; | |
991 | ||
992 | if (entry->start_dir) | |
993 | hname = entry->u.file->name; | |
994 | else | |
995 | hname = entry->u.dir->name; | |
996 | ||
997 | return strcmp (hname, fname) == 0; | |
998 | } | |
999 | ||
1000 | /* Initialize everything in this source file. */ | |
1001 | void | |
1002 | _cpp_init_files (cpp_reader *pfile) | |
1003 | { | |
b92be669 | 1004 | pfile->file_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, |
8f9b4009 | 1005 | NULL, xcalloc, free); |
a23ee064 AP |
1006 | pfile->dir_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, |
1007 | NULL, xcalloc, free); | |
8f9b4009 NB |
1008 | allocate_file_hash_entries (pfile); |
1009 | } | |
1010 | ||
1011 | /* Finalize everything in this source file. */ | |
1012 | void | |
1013 | _cpp_cleanup_files (cpp_reader *pfile) | |
1014 | { | |
1015 | htab_delete (pfile->file_hash); | |
a23ee064 | 1016 | htab_delete (pfile->dir_hash); |
8f9b4009 NB |
1017 | } |
1018 | ||
1019 | /* Enter a file name in the hash for the sake of cpp_included. */ | |
1020 | void | |
1021 | _cpp_fake_include (cpp_reader *pfile, const char *fname) | |
1022 | { | |
6568f34b | 1023 | _cpp_find_file (pfile, fname, pfile->buffer->file->dir, true, 0); |
add7091b ZW |
1024 | } |
1025 | ||
e605b040 | 1026 | /* Not everyone who wants to set system-header-ness on a buffer can |
642ce434 NB |
1027 | see the details of a buffer. This is an exported interface because |
1028 | fix-header needs it. */ | |
e605b040 | 1029 | void |
6cf87ca4 | 1030 | cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc) |
e605b040 | 1031 | { |
614c7d37 | 1032 | int flags = 0; |
500bee0a PB |
1033 | const struct line_maps *line_table = pfile->line_table; |
1034 | const struct line_map *map = &line_table->maps[line_table->used-1]; | |
614c7d37 NB |
1035 | |
1036 | /* 1 = system header, 2 = system header to be treated as C. */ | |
1037 | if (syshdr) | |
1038 | flags = 1 + (externc != 0); | |
12f9df4e PB |
1039 | pfile->buffer->sysp = flags; |
1040 | _cpp_do_file_change (pfile, LC_RENAME, map->to_file, | |
500bee0a | 1041 | SOURCE_LINE (map, pfile->line_table->highest_line), flags); |
e605b040 ZW |
1042 | } |
1043 | ||
b4e46cea PB |
1044 | /* Allow the client to change the current file. Used by the front end |
1045 | to achieve pseudo-file names like <built-in>. | |
1046 | If REASON is LC_LEAVE, then NEW_NAME must be NULL. */ | |
c19b12cb | 1047 | void |
6cf87ca4 ZW |
1048 | cpp_change_file (cpp_reader *pfile, enum lc_reason reason, |
1049 | const char *new_name) | |
c19b12cb | 1050 | { |
b4e46cea | 1051 | _cpp_do_file_change (pfile, reason, new_name, 1, 0); |
c19b12cb NB |
1052 | } |
1053 | ||
8f9b4009 | 1054 | /* Callback function for htab_traverse. */ |
c71f835b | 1055 | static int |
8f9b4009 | 1056 | report_missing_guard (void **slot, void *b) |
c71f835b | 1057 | { |
8f9b4009 | 1058 | struct file_hash_entry *entry = (struct file_hash_entry *) *slot; |
dc65cd60 | 1059 | int *bannerp = (int *) b; |
c71f835b | 1060 | |
8f9b4009 NB |
1061 | /* Skip directories. */ |
1062 | if (entry->start_dir != NULL) | |
c71f835b | 1063 | { |
8f9b4009 NB |
1064 | _cpp_file *file = entry->u.file; |
1065 | ||
1066 | /* We don't want MI guard advice for the main file. */ | |
1067 | if (file->cmacro == NULL && file->stack_count == 1 && !file->main_file) | |
c71f835b | 1068 | { |
8f9b4009 NB |
1069 | if (*bannerp == 0) |
1070 | { | |
1071 | fputs (_("Multiple include guards may be useful for:\n"), | |
1072 | stderr); | |
1073 | *bannerp = 1; | |
1074 | } | |
1075 | ||
1076 | fputs (entry->u.file->path, stderr); | |
1077 | putc ('\n', stderr); | |
c71f835b | 1078 | } |
c71f835b | 1079 | } |
c71f835b | 1080 | |
8f9b4009 | 1081 | return 0; |
a36c54fa NB |
1082 | } |
1083 | ||
8f9b4009 NB |
1084 | /* Report on all files that might benefit from a multiple include guard. |
1085 | Triggered by -H. */ | |
1086 | void | |
1087 | _cpp_report_missing_guards (cpp_reader *pfile) | |
168d3732 | 1088 | { |
8f9b4009 | 1089 | int banner = 0; |
ba133c96 | 1090 | |
8f9b4009 | 1091 | htab_traverse (pfile->file_hash, report_missing_guard, &banner); |
168d3732 ZW |
1092 | } |
1093 | ||
41947a54 | 1094 | /* Locate HEADER, and determine whether it is newer than the current |
48c4721e | 1095 | file. If it cannot be located or dated, return -1, if it is |
41947a54 | 1096 | newer, return 1, otherwise 0. */ |
f3f751ad | 1097 | int |
6cf87ca4 ZW |
1098 | _cpp_compare_file_date (cpp_reader *pfile, const char *fname, |
1099 | int angle_brackets) | |
f3f751ad | 1100 | { |
8f9b4009 NB |
1101 | _cpp_file *file; |
1102 | struct cpp_dir *dir; | |
df383483 | 1103 | |
8f9b4009 NB |
1104 | dir = search_path_head (pfile, fname, angle_brackets, IT_INCLUDE); |
1105 | if (!dir) | |
f3f751ad | 1106 | return -1; |
41947a54 | 1107 | |
6568f34b | 1108 | file = _cpp_find_file (pfile, fname, dir, false, angle_brackets); |
8f9b4009 NB |
1109 | if (file->err_no) |
1110 | return -1; | |
c45da1ca | 1111 | |
8f9b4009 | 1112 | if (file->fd != -1) |
c0bfe993 | 1113 | { |
8f9b4009 NB |
1114 | close (file->fd); |
1115 | file->fd = -1; | |
c0bfe993 | 1116 | } |
041c3194 | 1117 | |
8f9b4009 | 1118 | return file->st.st_mtime > pfile->buffer->file->st.st_mtime; |
f8f769ea ZW |
1119 | } |
1120 | ||
c19b12cb NB |
1121 | /* Pushes the given file onto the buffer stack. Returns nonzero if |
1122 | successful. */ | |
1123 | bool | |
8f9b4009 | 1124 | cpp_push_include (cpp_reader *pfile, const char *fname) |
c19b12cb | 1125 | { |
8f9b4009 | 1126 | return _cpp_stack_include (pfile, fname, false, IT_CMDLINE); |
c19b12cb NB |
1127 | } |
1128 | ||
5d8ebbd8 | 1129 | /* Do appropriate cleanup when a file INC's buffer is popped off the |
af0d16cd NB |
1130 | input stack. */ |
1131 | void | |
8f9b4009 | 1132 | _cpp_pop_file_buffer (cpp_reader *pfile, _cpp_file *file) |
f9a0e96c | 1133 | { |
ba133c96 | 1134 | /* Record the inclusion-preventing macro, which could be NULL |
6d18adbc | 1135 | meaning no controlling macro. */ |
8f9b4009 NB |
1136 | if (pfile->mi_valid && file->cmacro == NULL) |
1137 | file->cmacro = pfile->mi_cmacro; | |
93c80368 NB |
1138 | |
1139 | /* Invalidate control macros in the #including file. */ | |
6d18adbc | 1140 | pfile->mi_valid = false; |
f9a0e96c | 1141 | |
8f9b4009 NB |
1142 | if (file->buffer) |
1143 | { | |
1144 | free ((void *) file->buffer); | |
1145 | file->buffer = NULL; | |
5571f74f | 1146 | file->buffer_valid = false; |
8f9b4009 | 1147 | } |
f9a0e96c ZW |
1148 | } |
1149 | ||
be8ac3e2 GZ |
1150 | /* Inteface to file statistics record in _cpp_file structure. */ |
1151 | struct stat * | |
1152 | _cpp_get_file_stat (_cpp_file *file) | |
1153 | { | |
1154 | return &file->st; | |
1155 | } | |
1156 | ||
8f9b4009 NB |
1157 | /* Set the include chain for "" to QUOTE, for <> to BRACKET. If |
1158 | QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the | |
1159 | directory of the including file. | |
ba133c96 | 1160 | |
8f9b4009 NB |
1161 | If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */ |
1162 | void | |
1163 | cpp_set_include_chains (cpp_reader *pfile, cpp_dir *quote, cpp_dir *bracket, | |
1164 | int quote_ignores_source_dir) | |
591e15a1 | 1165 | { |
8f9b4009 NB |
1166 | pfile->quote_include = quote; |
1167 | pfile->bracket_include = quote; | |
1168 | pfile->quote_ignores_source_dir = quote_ignores_source_dir; | |
591e15a1 | 1169 | |
8f9b4009 | 1170 | for (; quote; quote = quote->next) |
591e15a1 | 1171 | { |
8f9b4009 NB |
1172 | quote->name_map = NULL; |
1173 | quote->len = strlen (quote->name); | |
1174 | if (quote == bracket) | |
1175 | pfile->bracket_include = bracket; | |
ba133c96 | 1176 | } |
591e15a1 NB |
1177 | } |
1178 | ||
8f9b4009 NB |
1179 | /* Append the file name to the directory to create the path, but don't |
1180 | turn / into // or // into ///; // may be a namespace escape. */ | |
1181 | static char * | |
1182 | append_file_to_dir (const char *fname, cpp_dir *dir) | |
1183 | { | |
1184 | size_t dlen, flen; | |
1185 | char *path; | |
1186 | ||
1187 | dlen = dir->len; | |
1188 | flen = strlen (fname); | |
c3f829c1 | 1189 | path = XNEWVEC (char, dlen + 1 + flen + 1); |
8f9b4009 NB |
1190 | memcpy (path, dir->name, dlen); |
1191 | if (dlen && path[dlen - 1] != '/') | |
1192 | path[dlen++] = '/'; | |
1193 | memcpy (&path[dlen], fname, flen + 1); | |
1194 | ||
1195 | return path; | |
1196 | } | |
c31a6508 ZW |
1197 | |
1198 | /* Read a space delimited string of unlimited length from a stdio | |
5d8ebbd8 | 1199 | file F. */ |
c31a6508 | 1200 | static char * |
6cf87ca4 | 1201 | read_filename_string (int ch, FILE *f) |
c31a6508 ZW |
1202 | { |
1203 | char *alloc, *set; | |
1204 | int len; | |
1205 | ||
1206 | len = 20; | |
c3f829c1 | 1207 | set = alloc = XNEWVEC (char, len + 1); |
dc65cd60 | 1208 | if (! is_space (ch)) |
c31a6508 ZW |
1209 | { |
1210 | *set++ = ch; | |
dc65cd60 | 1211 | while ((ch = getc (f)) != EOF && ! is_space (ch)) |
c31a6508 ZW |
1212 | { |
1213 | if (set - alloc == len) | |
1214 | { | |
1215 | len *= 2; | |
c3f829c1 | 1216 | alloc = XRESIZEVEC (char, alloc, len + 1); |
c31a6508 ZW |
1217 | set = alloc + len / 2; |
1218 | } | |
1219 | *set++ = ch; | |
1220 | } | |
1221 | } | |
1222 | *set = '\0'; | |
1223 | ungetc (ch, f); | |
1224 | return alloc; | |
1225 | } | |
1226 | ||
8f9b4009 NB |
1227 | /* Read the file name map file for DIR. */ |
1228 | static void | |
1229 | read_name_map (cpp_dir *dir) | |
c31a6508 | 1230 | { |
8f9b4009 | 1231 | static const char FILE_NAME_MAP_FILE[] = "header.gcc"; |
c31a6508 ZW |
1232 | char *name; |
1233 | FILE *f; | |
8f9b4009 NB |
1234 | size_t len, count = 0, room = 9; |
1235 | ||
1236 | len = dir->len; | |
c3f829c1 | 1237 | name = (char *) alloca (len + sizeof (FILE_NAME_MAP_FILE) + 1); |
8f9b4009 NB |
1238 | memcpy (name, dir->name, len); |
1239 | if (len && name[len - 1] != '/') | |
1240 | name[len++] = '/'; | |
1241 | strcpy (name + len, FILE_NAME_MAP_FILE); | |
c31a6508 | 1242 | f = fopen (name, "r"); |
8767c894 | 1243 | |
c3f829c1 | 1244 | dir->name_map = XNEWVEC (const char *, room); |
8f9b4009 | 1245 | |
8767c894 NB |
1246 | /* Silently return NULL if we cannot open. */ |
1247 | if (f) | |
c31a6508 ZW |
1248 | { |
1249 | int ch; | |
c31a6508 ZW |
1250 | |
1251 | while ((ch = getc (f)) != EOF) | |
1252 | { | |
8f9b4009 | 1253 | char *to; |
c31a6508 | 1254 | |
dc65cd60 | 1255 | if (is_space (ch)) |
c31a6508 | 1256 | continue; |
8f9b4009 NB |
1257 | |
1258 | if (count + 2 > room) | |
1259 | { | |
1260 | room += 8; | |
c3f829c1 | 1261 | dir->name_map = XRESIZEVEC (const char *, dir->name_map, room); |
8f9b4009 NB |
1262 | } |
1263 | ||
1264 | dir->name_map[count] = read_filename_string (ch, f); | |
dc65cd60 | 1265 | while ((ch = getc (f)) != EOF && is_hspace (ch)) |
c31a6508 | 1266 | ; |
c31a6508 | 1267 | |
8f9b4009 | 1268 | to = read_filename_string (ch, f); |
3dce1408 | 1269 | if (IS_ABSOLUTE_PATH (to)) |
8f9b4009 | 1270 | dir->name_map[count + 1] = to; |
c31a6508 ZW |
1271 | else |
1272 | { | |
8f9b4009 | 1273 | dir->name_map[count + 1] = append_file_to_dir (to, dir); |
c31a6508 | 1274 | free (to); |
df383483 | 1275 | } |
c31a6508 | 1276 | |
8f9b4009 | 1277 | count += 2; |
c31a6508 ZW |
1278 | while ((ch = getc (f)) != '\n') |
1279 | if (ch == EOF) | |
1280 | break; | |
1281 | } | |
8f9b4009 | 1282 | |
c31a6508 ZW |
1283 | fclose (f); |
1284 | } | |
df383483 | 1285 | |
8f9b4009 NB |
1286 | /* Terminate the list of maps. */ |
1287 | dir->name_map[count] = NULL; | |
df383483 | 1288 | } |
c31a6508 | 1289 | |
8f9b4009 NB |
1290 | /* Remap a FILE's name based on the file_name_map, if any, for |
1291 | FILE->dir. If the file name has any directory separators, | |
1292 | recursively check those directories too. */ | |
c31a6508 | 1293 | static char * |
8f9b4009 | 1294 | remap_filename (cpp_reader *pfile, _cpp_file *file) |
c31a6508 | 1295 | { |
8f9b4009 NB |
1296 | const char *fname, *p; |
1297 | char *new_dir; | |
1298 | cpp_dir *dir; | |
1299 | size_t index, len; | |
8767c894 | 1300 | |
8f9b4009 NB |
1301 | dir = file->dir; |
1302 | fname = file->name; | |
df383483 | 1303 | |
8f9b4009 NB |
1304 | for (;;) |
1305 | { | |
1306 | if (!dir->name_map) | |
1307 | read_name_map (dir); | |
c31a6508 | 1308 | |
8f9b4009 NB |
1309 | for (index = 0; dir->name_map[index]; index += 2) |
1310 | if (!strcmp (dir->name_map[index], fname)) | |
1311 | return xstrdup (dir->name_map[index + 1]); | |
c31a6508 | 1312 | |
8f9b4009 NB |
1313 | p = strchr (fname, '/'); |
1314 | if (!p || p == fname) | |
1315 | return NULL; | |
f9200da2 | 1316 | |
8f9b4009 | 1317 | len = dir->len + (p - fname + 1); |
c3f829c1 | 1318 | new_dir = XNEWVEC (char, len + 1); |
8f9b4009 NB |
1319 | memcpy (new_dir, dir->name, dir->len); |
1320 | memcpy (new_dir + dir->len, fname, p - fname + 1); | |
1321 | new_dir[len] = '\0'; | |
df383483 | 1322 | |
8f9b4009 NB |
1323 | dir = make_cpp_dir (pfile, new_dir, dir->sysp); |
1324 | fname = p + 1; | |
0b3d776a | 1325 | } |
0b3d776a | 1326 | } |
986b1f13 | 1327 | |
8f9b4009 NB |
1328 | /* Returns true if PCHNAME is a valid PCH file for FILE. */ |
1329 | static bool | |
1330 | validate_pch (cpp_reader *pfile, _cpp_file *file, const char *pchname) | |
986b1f13 | 1331 | { |
8f9b4009 | 1332 | const char *saved_path = file->path; |
230fcd32 | 1333 | bool valid = false; |
986b1f13 | 1334 | |
8f9b4009 NB |
1335 | file->path = pchname; |
1336 | if (open_file (file)) | |
986b1f13 | 1337 | { |
230fcd32 | 1338 | valid = 1 & pfile->cb.valid_pch (pfile, pchname, file->fd); |
8f9b4009 | 1339 | |
230fcd32 | 1340 | if (!valid) |
986b1f13 | 1341 | { |
8f9b4009 NB |
1342 | close (file->fd); |
1343 | file->fd = -1; | |
986b1f13 | 1344 | } |
986b1f13 | 1345 | |
8f9b4009 | 1346 | if (CPP_OPTION (pfile, print_include_names)) |
986b1f13 | 1347 | { |
8f9b4009 | 1348 | unsigned int i; |
54020b29 | 1349 | for (i = 1; i < pfile->line_table->depth; i++) |
8f9b4009 NB |
1350 | putc ('.', stderr); |
1351 | fprintf (stderr, "%c %s\n", | |
230fcd32 | 1352 | valid ? '!' : 'x', pchname); |
986b1f13 | 1353 | } |
986b1f13 NB |
1354 | } |
1355 | ||
8f9b4009 | 1356 | file->path = saved_path; |
230fcd32 | 1357 | return valid; |
986b1f13 | 1358 | } |
94d1613b MS |
1359 | |
1360 | /* Get the path associated with the _cpp_file F. The path includes | |
1361 | the base name from the include directive and the directory it was | |
1362 | found in via the search path. */ | |
1363 | ||
1364 | const char * | |
1365 | cpp_get_path (struct _cpp_file *f) | |
1366 | { | |
1367 | return f->path; | |
1368 | } | |
1369 | ||
e3c287c9 MS |
1370 | /* Get the directory associated with the _cpp_file F. */ |
1371 | ||
1372 | cpp_dir * | |
1373 | cpp_get_dir (struct _cpp_file *f) | |
1374 | { | |
1375 | return f->dir; | |
1376 | } | |
1377 | ||
94d1613b MS |
1378 | /* Get the cpp_buffer currently associated with the cpp_reader |
1379 | PFILE. */ | |
1380 | ||
1381 | cpp_buffer * | |
1382 | cpp_get_buffer (cpp_reader *pfile) | |
1383 | { | |
1384 | return pfile->buffer; | |
1385 | } | |
1386 | ||
1387 | /* Get the _cpp_file associated with the cpp_buffer B. */ | |
1388 | ||
1389 | _cpp_file * | |
1390 | cpp_get_file (cpp_buffer *b) | |
1391 | { | |
1392 | return b->file; | |
1393 | } | |
1394 | ||
1395 | /* Get the previous cpp_buffer given a cpp_buffer B. The previous | |
1396 | buffer is the buffer that included the given buffer. */ | |
1397 | ||
1398 | cpp_buffer * | |
1399 | cpp_get_prev (cpp_buffer *b) | |
1400 | { | |
1401 | return b->prev; | |
1402 | } | |
73e61092 | 1403 | \f |
1ae58c30 | 1404 | /* This data structure holds the list of header files that were seen |
73e61092 GK |
1405 | while the PCH was being built. The 'entries' field is kept sorted |
1406 | in memcmp() order; yes, this means that on little-endian systems, | |
1407 | it's sorted initially by the least-significant byte of 'size', but | |
1408 | that's OK. The code does rely on having entries with the same size | |
1409 | next to each other. */ | |
1410 | ||
c3f829c1 GDR |
1411 | struct pchf_entry { |
1412 | /* The size of this file. This is used to save running a MD5 checksum | |
1413 | if the sizes don't match. */ | |
1414 | off_t size; | |
1415 | /* The MD5 checksum of this file. */ | |
1416 | unsigned char sum[16]; | |
1417 | /* Is this file to be included only once? */ | |
1418 | bool once_only; | |
1419 | }; | |
1420 | ||
73e61092 GK |
1421 | struct pchf_data { |
1422 | /* Number of pchf_entry structures. */ | |
1423 | size_t count; | |
1424 | ||
1425 | /* Are there any values with once_only set? | |
1426 | This is used as an optimisation, it means we don't have to search | |
1427 | the structure if we're processing a regular #include. */ | |
1428 | bool have_once_only; | |
16dd5cfe | 1429 | |
c3f829c1 | 1430 | struct pchf_entry entries[1]; |
73e61092 GK |
1431 | }; |
1432 | ||
1433 | static struct pchf_data *pchf; | |
1434 | ||
ecddfb39 MS |
1435 | /* A qsort ordering function for pchf_entry structures. */ |
1436 | ||
1437 | static int | |
1438 | pchf_save_compare (const void *e1, const void *e2) | |
73e61092 | 1439 | { |
ecddfb39 MS |
1440 | return memcmp (e1, e2, sizeof (struct pchf_entry)); |
1441 | } | |
73e61092 | 1442 | |
ecddfb39 | 1443 | /* Create and write to F a pchf_data structure. */ |
73e61092 | 1444 | |
ecddfb39 MS |
1445 | bool |
1446 | _cpp_save_file_entries (cpp_reader *pfile, FILE *fp) | |
73e61092 | 1447 | { |
ecddfb39 MS |
1448 | size_t count = 0; |
1449 | struct pchf_data *result; | |
1450 | size_t result_size; | |
1451 | _cpp_file *f; | |
73e61092 | 1452 | |
ecddfb39 MS |
1453 | for (f = pfile->all_files; f; f = f->next_file) |
1454 | ++count; | |
1455 | ||
1456 | result_size = (sizeof (struct pchf_data) | |
1457 | + sizeof (struct pchf_entry) * (count - 1)); | |
c3f829c1 | 1458 | result = XCNEWVAR (struct pchf_data, result_size); |
ecddfb39 MS |
1459 | |
1460 | result->count = 0; | |
1461 | result->have_once_only = false; | |
1462 | ||
1463 | for (f = pfile->all_files; f; f = f->next_file) | |
73e61092 | 1464 | { |
ecddfb39 | 1465 | size_t count; |
73e61092 GK |
1466 | |
1467 | /* This should probably never happen, since if a read error occurred | |
1468 | the PCH file shouldn't be written... */ | |
1469 | if (f->dont_read || f->err_no) | |
ecddfb39 MS |
1470 | continue; |
1471 | ||
1472 | if (f->stack_count == 0) | |
1473 | continue; | |
16dd5cfe | 1474 | |
ecddfb39 MS |
1475 | count = result->count++; |
1476 | ||
1477 | result->entries[count].once_only = f->once_only; | |
97d62313 | 1478 | /* |= is avoided in the next line because of an HP C compiler bug */ |
ecddfb39 | 1479 | result->have_once_only = result->have_once_only | f->once_only; |
73e61092 | 1480 | if (f->buffer_valid) |
ecddfb39 MS |
1481 | md5_buffer ((const char *)f->buffer, |
1482 | f->st.st_size, result->entries[count].sum); | |
73e61092 GK |
1483 | else |
1484 | { | |
1485 | FILE *ff; | |
1486 | int oldfd = f->fd; | |
1487 | ||
1488 | if (!open_file (f)) | |
1489 | { | |
6568f34b | 1490 | open_file_failed (pfile, f, 0); |
ecddfb39 | 1491 | return false; |
73e61092 GK |
1492 | } |
1493 | ff = fdopen (f->fd, "rb"); | |
ecddfb39 | 1494 | md5_stream (ff, result->entries[count].sum); |
73e61092 GK |
1495 | fclose (ff); |
1496 | f->fd = oldfd; | |
1497 | } | |
ecddfb39 | 1498 | result->entries[count].size = f->st.st_size; |
73e61092 | 1499 | } |
73e61092 GK |
1500 | |
1501 | result_size = (sizeof (struct pchf_data) | |
1502 | + sizeof (struct pchf_entry) * (result->count - 1)); | |
16dd5cfe | 1503 | |
73e61092 GK |
1504 | qsort (result->entries, result->count, sizeof (struct pchf_entry), |
1505 | pchf_save_compare); | |
1506 | ||
ecddfb39 | 1507 | return fwrite (result, result_size, 1, fp) == 1; |
73e61092 GK |
1508 | } |
1509 | ||
1510 | /* Read the pchf_data structure from F. */ | |
1511 | ||
1512 | bool | |
1513 | _cpp_read_file_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, FILE *f) | |
1514 | { | |
1515 | struct pchf_data d; | |
16dd5cfe | 1516 | |
73e61092 GK |
1517 | if (fread (&d, sizeof (struct pchf_data) - sizeof (struct pchf_entry), 1, f) |
1518 | != 1) | |
1519 | return false; | |
16dd5cfe | 1520 | |
c3f829c1 | 1521 | pchf = XNEWVAR (struct pchf_data, sizeof (struct pchf_data) |
73e61092 GK |
1522 | + sizeof (struct pchf_entry) * (d.count - 1)); |
1523 | memcpy (pchf, &d, sizeof (struct pchf_data) - sizeof (struct pchf_entry)); | |
1524 | if (fread (pchf->entries, sizeof (struct pchf_entry), d.count, f) | |
1525 | != d.count) | |
1526 | return false; | |
1527 | return true; | |
1528 | } | |
1529 | ||
1530 | /* The parameters for pchf_compare. */ | |
1531 | ||
1532 | struct pchf_compare_data | |
1533 | { | |
1534 | /* The size of the file we're looking for. */ | |
1535 | off_t size; | |
1536 | ||
1537 | /* The MD5 checksum of the file, if it's been computed. */ | |
1538 | unsigned char sum[16]; | |
1539 | ||
1540 | /* Is SUM valid? */ | |
1541 | bool sum_computed; | |
1542 | ||
1543 | /* Do we need to worry about entries that don't have ONCE_ONLY set? */ | |
1544 | bool check_included; | |
16dd5cfe | 1545 | |
73e61092 GK |
1546 | /* The file that we're searching for. */ |
1547 | _cpp_file *f; | |
1548 | }; | |
1549 | ||
1550 | /* bsearch comparison function; look for D_P in E_P. */ | |
1551 | ||
1552 | static int | |
1553 | pchf_compare (const void *d_p, const void *e_p) | |
1554 | { | |
1555 | const struct pchf_entry *e = (const struct pchf_entry *)e_p; | |
1556 | struct pchf_compare_data *d = (struct pchf_compare_data *)d_p; | |
1557 | int result; | |
16dd5cfe | 1558 | |
73e61092 GK |
1559 | result = memcmp (&d->size, &e->size, sizeof (off_t)); |
1560 | if (result != 0) | |
1561 | return result; | |
16dd5cfe | 1562 | |
73e61092 GK |
1563 | if (! d->sum_computed) |
1564 | { | |
1565 | _cpp_file *const f = d->f; | |
16dd5cfe | 1566 | |
73e61092 GK |
1567 | md5_buffer ((const char *)f->buffer, f->st.st_size, d->sum); |
1568 | d->sum_computed = true; | |
1569 | } | |
1570 | ||
1571 | result = memcmp (d->sum, e->sum, 16); | |
1572 | if (result != 0) | |
1573 | return result; | |
1574 | ||
1575 | if (d->check_included || e->once_only) | |
1576 | return 0; | |
1577 | else | |
1578 | return 1; | |
1579 | } | |
1580 | ||
16dd5cfe | 1581 | /* Check that F is not in a list read from a PCH file (if any). |
73e61092 GK |
1582 | Assumes that f->buffer_valid is true. Return TRUE if the file |
1583 | should not be read. */ | |
1584 | ||
1585 | static bool | |
1586 | check_file_against_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, | |
1587 | _cpp_file *f, | |
1588 | bool check_included) | |
1589 | { | |
1590 | struct pchf_compare_data d; | |
16dd5cfe | 1591 | |
73e61092 GK |
1592 | if (pchf == NULL |
1593 | || (! check_included && ! pchf->have_once_only)) | |
1594 | return false; | |
1595 | ||
1596 | d.size = f->st.st_size; | |
1597 | d.sum_computed = false; | |
1598 | d.f = f; | |
1599 | d.check_included = check_included; | |
1600 | return bsearch (&d, pchf->entries, pchf->count, sizeof (struct pchf_entry), | |
1601 | pchf_compare) != NULL; | |
1602 | } |