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Commit | Line | Data |
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93509525 | 1 | /* Low-level I/O routines for BFDs. |
7c192733 | 2 | |
fd67aa11 | 3 | Copyright (C) 1990-2024 Free Software Foundation, Inc. |
7c192733 | 4 | |
93509525 KD |
5 | Written by Cygnus Support. |
6 | ||
cd123cb7 | 7 | This file is part of BFD, the Binary File Descriptor library. |
93509525 | 8 | |
cd123cb7 NC |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
93509525 | 13 | |
cd123cb7 NC |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
93509525 | 18 | |
cd123cb7 NC |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | MA 02110-1301, USA. */ | |
93509525 KD |
23 | |
24 | #include "sysdep.h" | |
3db64b00 | 25 | #include <limits.h> |
93509525 KD |
26 | #include "bfd.h" |
27 | #include "libbfd.h" | |
b570b954 | 28 | #include "aout/ar.h" |
0b8448af NC |
29 | #if defined (_WIN32) |
30 | #include <windows.h> | |
68e80d96 | 31 | #include <locale.h> |
0b8448af | 32 | #endif |
93509525 | 33 | |
93509525 KD |
34 | #ifndef S_IXUSR |
35 | #define S_IXUSR 0100 /* Execute by owner. */ | |
36 | #endif | |
37 | #ifndef S_IXGRP | |
38 | #define S_IXGRP 0010 /* Execute by group. */ | |
39 | #endif | |
40 | #ifndef S_IXOTH | |
41 | #define S_IXOTH 0001 /* Execute by others. */ | |
42 | #endif | |
43 | ||
428b207a TT |
44 | #ifndef FD_CLOEXEC |
45 | #define FD_CLOEXEC 1 | |
46 | #endif | |
47 | ||
7c192733 | 48 | file_ptr |
c7c3d11b | 49 | _bfd_real_ftell (FILE *file) |
7c192733 AC |
50 | { |
51 | #if defined (HAVE_FTELLO64) | |
52 | return ftello64 (file); | |
53 | #elif defined (HAVE_FTELLO) | |
54 | return ftello (file); | |
55 | #else | |
56 | return ftell (file); | |
57 | #endif | |
58 | } | |
59 | ||
60 | int | |
c7c3d11b | 61 | _bfd_real_fseek (FILE *file, file_ptr offset, int whence) |
7c192733 AC |
62 | { |
63 | #if defined (HAVE_FSEEKO64) | |
64 | return fseeko64 (file, offset, whence); | |
65 | #elif defined (HAVE_FSEEKO) | |
66 | return fseeko (file, offset, whence); | |
67 | #else | |
68 | return fseek (file, offset, whence); | |
69 | #endif | |
70 | } | |
71 | ||
428b207a TT |
72 | /* Mark FILE as close-on-exec. Return FILE. FILE may be NULL, in |
73 | which case nothing is done. */ | |
74 | static FILE * | |
75 | close_on_exec (FILE *file) | |
76 | { | |
77 | #if defined (HAVE_FILENO) && defined (F_GETFD) | |
78 | if (file) | |
79 | { | |
80 | int fd = fileno (file); | |
81 | int old = fcntl (fd, F_GETFD, 0); | |
82 | if (old >= 0) | |
83 | fcntl (fd, F_SETFD, old | FD_CLOEXEC); | |
84 | } | |
85 | #endif | |
86 | return file; | |
87 | } | |
88 | ||
2e6f4fae | 89 | FILE * |
c7c3d11b | 90 | _bfd_real_fopen (const char *filename, const char *modes) |
2e6f4fae | 91 | { |
d387240a | 92 | #ifdef VMS |
d387240a TG |
93 | char *vms_attr; |
94 | ||
9aff4b7a | 95 | /* On VMS, fopen allows file attributes as optional arguments. |
d387240a TG |
96 | We need to use them but we'd better to use the common prototype. |
97 | In fopen-vms.h, they are separated from the mode with a comma. | |
98 | Split here. */ | |
99 | vms_attr = strchr (modes, ','); | |
0b8448af | 100 | if (vms_attr != NULL) |
d387240a | 101 | { |
0c376465 TG |
102 | /* Attributes found. Split. */ |
103 | size_t modes_len = strlen (modes) + 1; | |
104 | char attrs[modes_len + 1]; | |
105 | char *at[3]; | |
106 | int i; | |
107 | ||
108 | memcpy (attrs, modes, modes_len); | |
109 | at[0] = attrs; | |
110 | for (i = 0; i < 2; i++) | |
111 | { | |
112 | at[i + 1] = strchr (at[i], ','); | |
113 | BFD_ASSERT (at[i + 1] != NULL); | |
114 | *(at[i + 1]++) = 0; /* Replace ',' with a nul, and skip it. */ | |
115 | } | |
116 | return close_on_exec (fopen (filename, at[0], at[1], at[2])); | |
d387240a | 117 | } |
0b8448af NC |
118 | |
119 | #elif defined (_WIN32) | |
ba0eb22c | 120 | /* PR 25713: Handle extra long path names possibly containing '..' and '.'. */ |
eac88f32 ZX |
121 | wchar_t ** lpFilePart = {NULL}; |
122 | const wchar_t prefixDOS[] = L"\\\\?\\"; | |
123 | const wchar_t prefixUNC[] = L"\\\\?\\UNC\\"; | |
9dd91814 | 124 | const wchar_t prefixNone[] = L""; |
eac88f32 ZX |
125 | const size_t partPathLen = strlen (filename) + 1; |
126 | const wchar_t * prefix; | |
127 | size_t sizeof_prefix; | |
9dd91814 NC |
128 | bool strip_network_prefix = false; |
129 | ||
130 | /* PR 31527: In order to not hit limits in the maximum file path, all paths | |
131 | need converting to Universal Naming Convention (UNC) syntax. The following | |
132 | forms may be provided to this function and are converted accordingly. | |
133 | ||
134 | 1. UNC paths (start with \\?\), these are unconverted; | |
135 | 2. Network paths (start with \\ or // but not \\?\), these are given the | |
136 | \\?UNC\ prefix, and have the incoming \\ or // removed; | |
137 | 3. DOS drive paths (a letter followed by a colon), these are given the | |
138 | \\?\ prefix; | |
139 | 4. Paths relative to CWD, the current working directory is tested for the | |
140 | above conditions, and otherwise are assumed to be DOS paths. | |
141 | ||
142 | For more information see: | |
143 | https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry | |
eac88f32 | 144 | */ |
eac88f32 | 145 | |
9dd91814 NC |
146 | if (startswith (filename, "\\\\?\\")) |
147 | { | |
148 | prefix = prefixNone; | |
149 | sizeof_prefix = sizeof (prefixNone); | |
150 | } | |
151 | else if (startswith (filename, "\\\\") || startswith (filename, "//")) | |
eac88f32 ZX |
152 | { |
153 | prefix = prefixUNC; | |
154 | sizeof_prefix = sizeof (prefixUNC); | |
9dd91814 | 155 | strip_network_prefix = true; |
eac88f32 | 156 | } |
9dd91814 | 157 | else if (strlen (filename) > 2 && filename[1] == ':') |
eac88f32 ZX |
158 | { |
159 | prefix = prefixDOS; | |
160 | sizeof_prefix = sizeof (prefixDOS); | |
161 | } | |
9dd91814 NC |
162 | else |
163 | { | |
164 | /* The partial path is relative to the current working directory, use this | |
165 | to determine the prefix. | |
166 | 1) Get the length: Calling with lpBuffer set to null returns the length. | |
167 | 2) Resolve the path. */ | |
168 | size_t pwdWSize = GetCurrentDirectoryW (0, NULL); | |
169 | wchar_t * pwdPath = calloc (pwdWSize, sizeof(wchar_t)); | |
170 | GetCurrentDirectoryW (pwdWSize, pwdPath); | |
171 | if (wcsncmp (pwdPath, L"\\\\?\\", 6) == 0) | |
172 | { | |
173 | prefix = prefixNone; | |
174 | sizeof_prefix = sizeof (prefixNone); | |
175 | } | |
176 | else if (wcsncmp (pwdPath, L"\\\\", 2) == 0 | |
177 | || wcsncmp (pwdPath, L"//", 2) == 0) | |
178 | { | |
179 | prefix = prefixUNC; | |
180 | sizeof_prefix = sizeof (prefixUNC); | |
181 | strip_network_prefix = true; | |
182 | } | |
183 | else | |
184 | { | |
185 | prefix = prefixDOS; | |
186 | sizeof_prefix = sizeof (prefixDOS); | |
187 | } | |
188 | free (pwdPath); | |
189 | } | |
eac88f32 | 190 | |
68e80d96 | 191 | #ifdef __MINGW32__ |
9d099144 | 192 | #if !HAVE_DECL____LC_CODEPAGE_FUNC |
eac88f32 ZX |
193 | /* This prototype was added to locale.h in version 9.0 of MinGW-w64. */ |
194 | _CRTIMP unsigned int __cdecl ___lc_codepage_func (void); | |
9d099144 | 195 | #endif |
eac88f32 | 196 | const unsigned int cp = ___lc_codepage_func (); |
68e80d96 | 197 | #else |
eac88f32 | 198 | const unsigned int cp = CP_UTF8; |
68e80d96 | 199 | #endif |
17d60030 | 200 | |
eac88f32 ZX |
201 | /* Converting the partial path from ascii to unicode. |
202 | 1) Get the length: Calling with lpWideCharStr set to null returns the length. | |
203 | 2) Convert the string: Calling with cbMultiByte set to -1 includes the terminating null. */ | |
204 | size_t partPathWSize = MultiByteToWideChar (cp, 0, filename, -1, NULL, 0); | |
205 | wchar_t * partPath = calloc (partPathWSize, sizeof(wchar_t)); | |
206 | size_t ix; | |
17d60030 | 207 | |
eac88f32 | 208 | MultiByteToWideChar (cp, 0, filename, -1, partPath, partPathWSize); |
17d60030 | 209 | |
eac88f32 ZX |
210 | /* Convert any UNIX style path separators into the DOS i.e. backslash separator. */ |
211 | for (ix = 0; ix < partPathLen; ix++) | |
212 | if (IS_UNIX_DIR_SEPARATOR(filename[ix])) | |
213 | partPath[ix] = '\\'; | |
0b8448af | 214 | |
eac88f32 ZX |
215 | /* Getting the full path from the provided partial path. |
216 | 1) Get the length. | |
217 | 2) Resolve the path. */ | |
218 | long fullPathWSize = GetFullPathNameW (partPath, 0, NULL, lpFilePart); | |
219 | wchar_t * fullPath = calloc (fullPathWSize + sizeof_prefix + 1, sizeof(wchar_t)); | |
cb7da2a6 | 220 | |
eac88f32 | 221 | wcscpy (fullPath, prefix); |
ba0eb22c | 222 | |
eac88f32 | 223 | int prefixLen = sizeof_prefix / sizeof(wchar_t); |
a8cf07d3 | 224 | |
eac88f32 ZX |
225 | /* Do not add a prefix to the null device. */ |
226 | if (stricmp (filename, "nul") == 0) | |
a8cf07d3 H |
227 | prefixLen = 1; |
228 | ||
eac88f32 ZX |
229 | wchar_t * fullPathOffset = fullPath + prefixLen - 1; |
230 | ||
231 | GetFullPathNameW (partPath, fullPathWSize, fullPathOffset, lpFilePart); | |
232 | ||
9dd91814 | 233 | if (strip_network_prefix) |
eac88f32 ZX |
234 | { |
235 | /* Remove begining of the beginning two backslash characters (\\). */ | |
236 | wchar_t *_fullPath = calloc (fullPathWSize + sizeof_prefix + 1, sizeof(wchar_t)); | |
237 | ||
238 | GetFullPathNameW (fullPath, fullPathWSize + sizeof_prefix + 1, _fullPath, lpFilePart); | |
239 | free (fullPath); | |
240 | fullPath = _fullPath; | |
241 | } | |
ba0eb22c | 242 | |
eac88f32 | 243 | free (partPath); |
cb7da2a6 | 244 | |
eac88f32 ZX |
245 | /* It is non-standard for modes to exceed 16 characters. */ |
246 | wchar_t modesW[16]; | |
ba0eb22c | 247 | |
eac88f32 | 248 | MultiByteToWideChar (cp, 0, modes, -1, modesW, sizeof(modesW)); |
cb7da2a6 | 249 | |
eac88f32 | 250 | FILE * file = _wfopen (fullPath, modesW); |
9dd91814 NC |
251 | if (!file) |
252 | perror("Error opening file"); | |
eac88f32 | 253 | free (fullPath); |
cb7da2a6 | 254 | |
eac88f32 | 255 | return close_on_exec (file); |
0b8448af NC |
256 | |
257 | #elif defined (HAVE_FOPEN64) | |
428b207a | 258 | return close_on_exec (fopen64 (filename, modes)); |
0b8448af | 259 | |
cb7da2a6 | 260 | #else |
0b8448af | 261 | return close_on_exec (fopen (filename, modes)); |
cb7da2a6 | 262 | #endif |
2e6f4fae DJ |
263 | } |
264 | ||
40838a72 AC |
265 | /* |
266 | INTERNAL_DEFINITION | |
267 | struct bfd_iovec | |
93509525 | 268 | |
40838a72 | 269 | DESCRIPTION |
93509525 | 270 | |
40838a72 AC |
271 | The <<struct bfd_iovec>> contains the internal file I/O class. |
272 | Each <<BFD>> has an instance of this class and all file I/O is | |
273 | routed through it (it is assumed that the instance implements | |
274 | all methods listed below). | |
275 | ||
276 | .struct bfd_iovec | |
277 | .{ | |
278 | . {* To avoid problems with macros, a "b" rather than "f" | |
279 | . prefix is prepended to each method name. *} | |
280 | . {* Attempt to read/write NBYTES on ABFD's IOSTREAM storing/fetching | |
281 | . bytes starting at PTR. Return the number of bytes actually | |
282 | . transfered (a read past end-of-file returns less than NBYTES), | |
283 | . or -1 (setting <<bfd_error>>) if an error occurs. *} | |
284 | . file_ptr (*bread) (struct bfd *abfd, void *ptr, file_ptr nbytes); | |
285 | . file_ptr (*bwrite) (struct bfd *abfd, const void *ptr, | |
07d6d2b8 | 286 | . file_ptr nbytes); |
40838a72 AC |
287 | . {* Return the current IOSTREAM file offset, or -1 (setting <<bfd_error>> |
288 | . if an error occurs. *} | |
289 | . file_ptr (*btell) (struct bfd *abfd); | |
290 | . {* For the following, on successful completion a value of 0 is returned. | |
07d6d2b8 | 291 | . Otherwise, a value of -1 is returned (and <<bfd_error>> is set). *} |
40838a72 | 292 | . int (*bseek) (struct bfd *abfd, file_ptr offset, int whence); |
405bf443 | 293 | . int (*bclose) (struct bfd *abfd); |
40838a72 AC |
294 | . int (*bflush) (struct bfd *abfd); |
295 | . int (*bstat) (struct bfd *abfd, struct stat *sb); | |
4c95ab76 TG |
296 | . {* Mmap a part of the files. ADDR, LEN, PROT, FLAGS and OFFSET are the usual |
297 | . mmap parameter, except that LEN and OFFSET do not need to be page | |
298 | . aligned. Returns (void *)-1 on failure, mmapped address on success. | |
299 | . Also write in MAP_ADDR the address of the page aligned buffer and in | |
300 | . MAP_LEN the size mapped (a page multiple). Use unmap with MAP_ADDR and | |
301 | . MAP_LEN to unmap. *} | |
4810a2d9 | 302 | . void *(*bmmap) (struct bfd *abfd, void *addr, size_t len, |
07d6d2b8 | 303 | . int prot, int flags, file_ptr offset, |
4810a2d9 | 304 | . void **map_addr, size_t *map_len); |
40838a72 | 305 | .}; |
93509525 | 306 | |
65077aa8 | 307 | .extern const struct bfd_iovec _bfd_memory_iovec; |
717d4bd6 | 308 | . |
40838a72 | 309 | */ |
93509525 | 310 | |
93509525 | 311 | |
717d4bd6 AM |
312 | /* |
313 | FUNCTION | |
226f9f4f | 314 | bfd_read |
717d4bd6 AM |
315 | |
316 | SYNOPSIS | |
e416bd75 AM |
317 | bfd_size_type bfd_read (void *, bfd_size_type, bfd *) |
318 | ATTRIBUTE_WARN_UNUSED_RESULT; | |
717d4bd6 AM |
319 | |
320 | DESCRIPTION | |
321 | Attempt to read SIZE bytes from ABFD's iostream to PTR. | |
322 | Return the amount read. | |
323 | */ | |
93509525 KD |
324 | |
325 | bfd_size_type | |
226f9f4f | 326 | bfd_read (void *ptr, bfd_size_type size, bfd *abfd) |
93509525 | 327 | { |
5c4ce239 AM |
328 | file_ptr nread; |
329 | bfd *element_bfd = abfd; | |
330 | ufile_ptr offset = 0; | |
331 | ||
332 | while (abfd->my_archive != NULL | |
333 | && !bfd_is_thin_archive (abfd->my_archive)) | |
334 | { | |
335 | offset += abfd->origin; | |
336 | abfd = abfd->my_archive; | |
337 | } | |
4d095f5b | 338 | offset += abfd->origin; |
93509525 | 339 | |
c17eb63b | 340 | /* If this is a non-thin archive element, don't read past the end of |
1fb41da4 | 341 | this element. */ |
c17eb63b L |
342 | if (element_bfd->arelt_data != NULL |
343 | && element_bfd->my_archive != NULL | |
344 | && !bfd_is_thin_archive (element_bfd->my_archive)) | |
1fb41da4 | 345 | { |
5c4ce239 | 346 | bfd_size_type maxbytes = arelt_size (element_bfd); |
f1bb16f8 | 347 | |
5c4ce239 | 348 | if (abfd->where < offset || abfd->where - offset >= maxbytes) |
07d6d2b8 | 349 | { |
5c4ce239 AM |
350 | bfd_set_error (bfd_error_invalid_operation); |
351 | return -1; | |
07d6d2b8 | 352 | } |
5c4ce239 AM |
353 | if (abfd->where - offset + size > maxbytes) |
354 | size = maxbytes - (abfd->where - offset); | |
1fb41da4 AM |
355 | } |
356 | ||
5c4ce239 AM |
357 | if (abfd->iovec == NULL) |
358 | { | |
359 | bfd_set_error (bfd_error_invalid_operation); | |
360 | return -1; | |
361 | } | |
362 | ||
f82ee0c8 AM |
363 | if (abfd->last_io == bfd_io_write) |
364 | { | |
365 | abfd->last_io = bfd_io_force; | |
366 | if (bfd_seek (abfd, 0, SEEK_CUR) != 0) | |
367 | return -1; | |
368 | } | |
369 | abfd->last_io = bfd_io_read; | |
370 | ||
5c4ce239 AM |
371 | nread = abfd->iovec->bread (abfd, ptr, size); |
372 | if (nread != -1) | |
93509525 KD |
373 | abfd->where += nread; |
374 | ||
93509525 KD |
375 | return nread; |
376 | } | |
377 | ||
717d4bd6 AM |
378 | /* |
379 | FUNCTION | |
226f9f4f | 380 | bfd_write |
717d4bd6 AM |
381 | |
382 | SYNOPSIS | |
e416bd75 AM |
383 | bfd_size_type bfd_write (const void *, bfd_size_type, bfd *) |
384 | ATTRIBUTE_WARN_UNUSED_RESULT; | |
717d4bd6 AM |
385 | |
386 | DESCRIPTION | |
387 | Attempt to write SIZE bytes to ABFD's iostream from PTR. | |
388 | Return the amount written. | |
389 | */ | |
390 | ||
93509525 | 391 | bfd_size_type |
226f9f4f | 392 | bfd_write (const void *ptr, bfd_size_type size, bfd *abfd) |
93509525 | 393 | { |
5c4ce239 | 394 | file_ptr nwrote; |
93509525 | 395 | |
5c4ce239 AM |
396 | while (abfd->my_archive != NULL |
397 | && !bfd_is_thin_archive (abfd->my_archive)) | |
398 | abfd = abfd->my_archive; | |
69fd4758 | 399 | |
5c4ce239 AM |
400 | if (abfd->iovec == NULL) |
401 | { | |
402 | bfd_set_error (bfd_error_invalid_operation); | |
403 | return -1; | |
404 | } | |
405 | ||
f82ee0c8 AM |
406 | if (abfd->last_io == bfd_io_read) |
407 | { | |
408 | abfd->last_io = bfd_io_force; | |
409 | if (bfd_seek (abfd, 0, SEEK_CUR) != 0) | |
410 | return -1; | |
411 | } | |
412 | abfd->last_io = bfd_io_write; | |
413 | ||
5c4ce239 AM |
414 | nwrote = abfd->iovec->bwrite (abfd, ptr, size); |
415 | if (nwrote != -1) | |
93509525 | 416 | abfd->where += nwrote; |
5c4ce239 | 417 | if ((bfd_size_type) nwrote != size) |
93509525 KD |
418 | { |
419 | #ifdef ENOSPC | |
420 | errno = ENOSPC; | |
421 | #endif | |
422 | bfd_set_error (bfd_error_system_call); | |
423 | } | |
424 | return nwrote; | |
425 | } | |
426 | ||
717d4bd6 AM |
427 | /* |
428 | FUNCTION | |
429 | bfd_tell | |
430 | ||
431 | SYNOPSIS | |
e416bd75 | 432 | file_ptr bfd_tell (bfd *) ATTRIBUTE_WARN_UNUSED_RESULT; |
717d4bd6 AM |
433 | |
434 | DESCRIPTION | |
435 | Return ABFD's iostream file position. | |
436 | */ | |
437 | ||
7c192733 | 438 | file_ptr |
c58b9523 | 439 | bfd_tell (bfd *abfd) |
93509525 | 440 | { |
5c4ce239 | 441 | ufile_ptr offset = 0; |
93509525 KD |
442 | file_ptr ptr; |
443 | ||
5c4ce239 AM |
444 | while (abfd->my_archive != NULL |
445 | && !bfd_is_thin_archive (abfd->my_archive)) | |
69fd4758 | 446 | { |
5c4ce239 AM |
447 | offset += abfd->origin; |
448 | abfd = abfd->my_archive; | |
69fd4758 | 449 | } |
4d095f5b | 450 | offset += abfd->origin; |
93509525 | 451 | |
5c4ce239 AM |
452 | if (abfd->iovec == NULL) |
453 | return 0; | |
454 | ||
455 | ptr = abfd->iovec->btell (abfd); | |
93509525 | 456 | abfd->where = ptr; |
5c4ce239 | 457 | return ptr - offset; |
93509525 KD |
458 | } |
459 | ||
717d4bd6 AM |
460 | /* |
461 | FUNCTION | |
462 | bfd_flush | |
463 | ||
464 | SYNOPSIS | |
465 | int bfd_flush (bfd *); | |
466 | ||
467 | DESCRIPTION | |
468 | Flush ABFD's iostream pending IO. | |
469 | */ | |
470 | ||
93509525 | 471 | int |
c58b9523 | 472 | bfd_flush (bfd *abfd) |
93509525 | 473 | { |
5c4ce239 AM |
474 | while (abfd->my_archive != NULL |
475 | && !bfd_is_thin_archive (abfd->my_archive)) | |
476 | abfd = abfd->my_archive; | |
477 | ||
478 | if (abfd->iovec == NULL) | |
479 | return 0; | |
480 | ||
481 | return abfd->iovec->bflush (abfd); | |
93509525 KD |
482 | } |
483 | ||
717d4bd6 AM |
484 | /* |
485 | FUNCTION | |
486 | bfd_stat | |
487 | ||
488 | SYNOPSIS | |
e416bd75 | 489 | int bfd_stat (bfd *, struct stat *) ATTRIBUTE_WARN_UNUSED_RESULT; |
717d4bd6 AM |
490 | |
491 | DESCRIPTION | |
492 | Call fstat on ABFD's iostream. Return 0 on success, and a | |
493 | negative value on failure. | |
494 | */ | |
495 | ||
93509525 | 496 | int |
c58b9523 | 497 | bfd_stat (bfd *abfd, struct stat *statbuf) |
93509525 | 498 | { |
93509525 KD |
499 | int result; |
500 | ||
5c4ce239 AM |
501 | while (abfd->my_archive != NULL |
502 | && !bfd_is_thin_archive (abfd->my_archive)) | |
503 | abfd = abfd->my_archive; | |
69fd4758 | 504 | |
5c4ce239 AM |
505 | if (abfd->iovec == NULL) |
506 | { | |
507 | bfd_set_error (bfd_error_invalid_operation); | |
508 | return -1; | |
509 | } | |
510 | ||
511 | result = abfd->iovec->bstat (abfd, statbuf); | |
93509525 KD |
512 | if (result < 0) |
513 | bfd_set_error (bfd_error_system_call); | |
514 | return result; | |
515 | } | |
516 | ||
717d4bd6 AM |
517 | /* |
518 | FUNCTION | |
519 | bfd_seek | |
520 | ||
521 | SYNOPSIS | |
e416bd75 | 522 | int bfd_seek (bfd *, file_ptr, int) ATTRIBUTE_WARN_UNUSED_RESULT; |
717d4bd6 AM |
523 | |
524 | DESCRIPTION | |
525 | Call fseek on ABFD's iostream. Return 0 on success, and a | |
526 | negative value on failure. | |
527 | */ | |
93509525 KD |
528 | |
529 | int | |
c58b9523 | 530 | bfd_seek (bfd *abfd, file_ptr position, int direction) |
93509525 KD |
531 | { |
532 | int result; | |
5c4ce239 | 533 | ufile_ptr offset = 0; |
93509525 | 534 | |
5c4ce239 AM |
535 | while (abfd->my_archive != NULL |
536 | && !bfd_is_thin_archive (abfd->my_archive)) | |
93509525 | 537 | { |
5c4ce239 AM |
538 | offset += abfd->origin; |
539 | abfd = abfd->my_archive; | |
93509525 | 540 | } |
4d095f5b | 541 | offset += abfd->origin; |
93509525 | 542 | |
5c4ce239 | 543 | if (abfd->iovec == NULL) |
660722b0 | 544 | { |
5c4ce239 AM |
545 | bfd_set_error (bfd_error_invalid_operation); |
546 | return -1; | |
660722b0 | 547 | } |
93509525 | 548 | |
5c4ce239 AM |
549 | /* For the time being, a BFD may not seek to it's end. The problem |
550 | is that we don't easily have a way to recognize the end of an | |
551 | element in an archive. */ | |
552 | BFD_ASSERT (direction == SEEK_SET || direction == SEEK_CUR); | |
553 | ||
554 | if (direction != SEEK_CUR) | |
555 | position += offset; | |
69fd4758 | 556 | |
f82ee0c8 AM |
557 | if (((direction == SEEK_CUR && position == 0) |
558 | || (direction == SEEK_SET && (ufile_ptr) position == abfd->where)) | |
559 | && abfd->last_io != bfd_io_force) | |
560 | return 0; | |
561 | ||
562 | abfd->last_io = bfd_io_seek; | |
563 | ||
5c4ce239 | 564 | result = abfd->iovec->bseek (abfd, position, direction); |
93509525 KD |
565 | if (result != 0) |
566 | { | |
93509525 | 567 | /* An EINVAL error probably means that the file offset was |
07d6d2b8 | 568 | absurd. */ |
5c4ce239 | 569 | if (errno == EINVAL) |
93509525 KD |
570 | bfd_set_error (bfd_error_file_truncated); |
571 | else | |
5c4ce239 | 572 | bfd_set_error (bfd_error_system_call); |
93509525 KD |
573 | } |
574 | else | |
575 | { | |
576 | /* Adjust `where' field. */ | |
5c4ce239 | 577 | if (direction == SEEK_CUR) |
93509525 | 578 | abfd->where += position; |
5c4ce239 AM |
579 | else |
580 | abfd->where = position; | |
93509525 | 581 | } |
5c4ce239 | 582 | |
93509525 KD |
583 | return result; |
584 | } | |
585 | ||
586 | /* | |
587 | FUNCTION | |
588 | bfd_get_mtime | |
589 | ||
590 | SYNOPSIS | |
c58b9523 | 591 | long bfd_get_mtime (bfd *abfd); |
93509525 KD |
592 | |
593 | DESCRIPTION | |
594 | Return the file modification time (as read from the file system, or | |
595 | from the archive header for archive members). | |
596 | ||
597 | */ | |
598 | ||
599 | long | |
c58b9523 | 600 | bfd_get_mtime (bfd *abfd) |
93509525 | 601 | { |
93509525 KD |
602 | struct stat buf; |
603 | ||
604 | if (abfd->mtime_set) | |
605 | return abfd->mtime; | |
606 | ||
5c4ce239 | 607 | if (bfd_stat (abfd, &buf) != 0) |
93509525 KD |
608 | return 0; |
609 | ||
610 | abfd->mtime = buf.st_mtime; /* Save value in case anyone wants it */ | |
611 | return buf.st_mtime; | |
612 | } | |
613 | ||
614 | /* | |
615 | FUNCTION | |
616 | bfd_get_size | |
617 | ||
618 | SYNOPSIS | |
47fdcf63 | 619 | ufile_ptr bfd_get_size (bfd *abfd); |
93509525 KD |
620 | |
621 | DESCRIPTION | |
622 | Return the file size (as read from file system) for the file | |
623 | associated with BFD @var{abfd}. | |
624 | ||
625 | The initial motivation for, and use of, this routine is not | |
626 | so we can get the exact size of the object the BFD applies to, since | |
627 | that might not be generally possible (archive members for example). | |
628 | It would be ideal if someone could eventually modify | |
629 | it so that such results were guaranteed. | |
630 | ||
631 | Instead, we want to ask questions like "is this NNN byte sized | |
632 | object I'm about to try read from file offset YYY reasonable?" | |
633 | As as example of where we might do this, some object formats | |
634 | use string tables for which the first <<sizeof (long)>> bytes of the | |
635 | table contain the size of the table itself, including the size bytes. | |
636 | If an application tries to read what it thinks is one of these | |
637 | string tables, without some way to validate the size, and for | |
638 | some reason the size is wrong (byte swapping error, wrong location | |
639 | for the string table, etc.), the only clue is likely to be a read | |
640 | error when it tries to read the table, or a "virtual memory | |
641 | exhausted" error when it tries to allocate 15 bazillon bytes | |
642 | of space for the 15 bazillon byte table it is about to read. | |
5c4491d3 | 643 | This function at least allows us to answer the question, "is the |
93509525 | 644 | size reasonable?". |
b03202e3 AM |
645 | |
646 | A return value of zero indicates the file size is unknown. | |
93509525 KD |
647 | */ |
648 | ||
47fdcf63 | 649 | ufile_ptr |
c58b9523 | 650 | bfd_get_size (bfd *abfd) |
93509525 | 651 | { |
b03202e3 AM |
652 | /* A size of 0 means we haven't yet called bfd_stat. A size of 1 |
653 | means we have a cached value of 0, ie. unknown. */ | |
654 | if (abfd->size <= 1 || bfd_write_p (abfd)) | |
655 | { | |
656 | struct stat buf; | |
93509525 | 657 | |
b03202e3 AM |
658 | if (abfd->size == 1 && !bfd_write_p (abfd)) |
659 | return 0; | |
93509525 | 660 | |
b03202e3 AM |
661 | if (bfd_stat (abfd, &buf) != 0 |
662 | || buf.st_size == 0 | |
663 | || buf.st_size - (ufile_ptr) buf.st_size != 0) | |
664 | { | |
665 | abfd->size = 1; | |
666 | return 0; | |
667 | } | |
668 | abfd->size = buf.st_size; | |
669 | } | |
670 | return abfd->size; | |
93509525 | 671 | } |
25b88f33 | 672 | |
8e2f54bc L |
673 | /* |
674 | FUNCTION | |
675 | bfd_get_file_size | |
676 | ||
677 | SYNOPSIS | |
47fdcf63 | 678 | ufile_ptr bfd_get_file_size (bfd *abfd); |
8e2f54bc L |
679 | |
680 | DESCRIPTION | |
681 | Return the file size (as read from file system) for the file | |
682 | associated with BFD @var{abfd}. It supports both normal files | |
683 | and archive elements. | |
684 | ||
685 | */ | |
686 | ||
47fdcf63 | 687 | ufile_ptr |
8e2f54bc L |
688 | bfd_get_file_size (bfd *abfd) |
689 | { | |
b570b954 | 690 | ufile_ptr file_size, archive_size = (ufile_ptr) -1; |
3b37f0f1 | 691 | unsigned int compression_p2 = 0; |
b570b954 | 692 | |
8e2f54bc L |
693 | if (abfd->my_archive != NULL |
694 | && !bfd_is_thin_archive (abfd->my_archive)) | |
b570b954 AM |
695 | { |
696 | struct areltdata *adata = (struct areltdata *) abfd->arelt_data; | |
c01de193 AM |
697 | if (adata != NULL) |
698 | { | |
699 | archive_size = adata->parsed_size; | |
3b37f0f1 AM |
700 | /* If the archive is compressed, assume an element won't |
701 | expand more than eight times file size. */ | |
c01de193 AM |
702 | if (adata->arch_header != NULL |
703 | && memcmp (((struct ar_hdr *) adata->arch_header)->ar_fmag, | |
704 | "Z\012", 2) == 0) | |
3b37f0f1 | 705 | compression_p2 = 3; |
c01de193 AM |
706 | abfd = abfd->my_archive; |
707 | } | |
b570b954 | 708 | } |
8e2f54bc | 709 | |
3b37f0f1 | 710 | file_size = bfd_get_size (abfd) << compression_p2; |
b570b954 AM |
711 | if (archive_size < file_size) |
712 | return archive_size; | |
713 | return file_size; | |
8e2f54bc | 714 | } |
25b88f33 PP |
715 | |
716 | /* | |
717 | FUNCTION | |
718 | bfd_mmap | |
719 | ||
720 | SYNOPSIS | |
4810a2d9 | 721 | void *bfd_mmap (bfd *abfd, void *addr, size_t len, |
07d6d2b8 | 722 | int prot, int flags, file_ptr offset, |
4810a2d9 | 723 | void **map_addr, size_t *map_len) |
e416bd75 | 724 | ATTRIBUTE_WARN_UNUSED_RESULT; |
25b88f33 PP |
725 | |
726 | DESCRIPTION | |
727 | Return mmap()ed region of the file, if possible and implemented. | |
07d6d2b8 AM |
728 | LEN and OFFSET do not need to be page aligned. The page aligned |
729 | address and length are written to MAP_ADDR and MAP_LEN. | |
25b88f33 PP |
730 | |
731 | */ | |
732 | ||
733 | void * | |
4810a2d9 | 734 | bfd_mmap (bfd *abfd, void *addr, size_t len, |
4c95ab76 | 735 | int prot, int flags, file_ptr offset, |
4810a2d9 | 736 | void **map_addr, size_t *map_len) |
25b88f33 | 737 | { |
5c4ce239 AM |
738 | while (abfd->my_archive != NULL |
739 | && !bfd_is_thin_archive (abfd->my_archive)) | |
740 | { | |
741 | offset += abfd->origin; | |
742 | abfd = abfd->my_archive; | |
743 | } | |
4d095f5b | 744 | offset += abfd->origin; |
25b88f33 PP |
745 | |
746 | if (abfd->iovec == NULL) | |
5c4ce239 AM |
747 | { |
748 | bfd_set_error (bfd_error_invalid_operation); | |
2e384d4f | 749 | return MAP_FAILED; |
5c4ce239 | 750 | } |
25b88f33 | 751 | |
4c95ab76 | 752 | return abfd->iovec->bmmap (abfd, addr, len, prot, flags, offset, |
07d6d2b8 | 753 | map_addr, map_len); |
25b88f33 | 754 | } |
65077aa8 TG |
755 | |
756 | /* Memory file I/O operations. */ | |
757 | ||
758 | static file_ptr | |
759 | memory_bread (bfd *abfd, void *ptr, file_ptr size) | |
760 | { | |
761 | struct bfd_in_memory *bim; | |
762 | bfd_size_type get; | |
763 | ||
764 | bim = (struct bfd_in_memory *) abfd->iostream; | |
765 | get = size; | |
766 | if (abfd->where + get > bim->size) | |
767 | { | |
768 | if (bim->size < (bfd_size_type) abfd->where) | |
07d6d2b8 | 769 | get = 0; |
65077aa8 | 770 | else |
07d6d2b8 | 771 | get = bim->size - abfd->where; |
65077aa8 TG |
772 | bfd_set_error (bfd_error_file_truncated); |
773 | } | |
774 | memcpy (ptr, bim->buffer + abfd->where, (size_t) get); | |
775 | return get; | |
776 | } | |
777 | ||
778 | static file_ptr | |
779 | memory_bwrite (bfd *abfd, const void *ptr, file_ptr size) | |
780 | { | |
781 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; | |
782 | ||
783 | if (abfd->where + size > bim->size) | |
784 | { | |
785 | bfd_size_type newsize, oldsize; | |
786 | ||
787 | oldsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
788 | bim->size = abfd->where + size; | |
789 | /* Round up to cut down on memory fragmentation */ | |
790 | newsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
791 | if (newsize > oldsize) | |
07d6d2b8 AM |
792 | { |
793 | bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize); | |
794 | if (bim->buffer == NULL) | |
795 | { | |
796 | bim->size = 0; | |
797 | return 0; | |
798 | } | |
799 | if (newsize > bim->size) | |
800 | memset (bim->buffer + bim->size, 0, newsize - bim->size); | |
801 | } | |
65077aa8 TG |
802 | } |
803 | memcpy (bim->buffer + abfd->where, ptr, (size_t) size); | |
804 | return size; | |
805 | } | |
806 | ||
807 | static file_ptr | |
808 | memory_btell (bfd *abfd) | |
809 | { | |
810 | return abfd->where; | |
811 | } | |
812 | ||
813 | static int | |
814 | memory_bseek (bfd *abfd, file_ptr position, int direction) | |
815 | { | |
816 | file_ptr nwhere; | |
817 | struct bfd_in_memory *bim; | |
818 | ||
819 | bim = (struct bfd_in_memory *) abfd->iostream; | |
820 | ||
821 | if (direction == SEEK_SET) | |
822 | nwhere = position; | |
823 | else | |
824 | nwhere = abfd->where + position; | |
825 | ||
826 | if (nwhere < 0) | |
827 | { | |
828 | abfd->where = 0; | |
829 | errno = EINVAL; | |
830 | return -1; | |
831 | } | |
832 | ||
833 | if ((bfd_size_type)nwhere > bim->size) | |
834 | { | |
835 | if (abfd->direction == write_direction | |
07d6d2b8 AM |
836 | || abfd->direction == both_direction) |
837 | { | |
838 | bfd_size_type newsize, oldsize; | |
839 | ||
840 | oldsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
841 | bim->size = nwhere; | |
842 | /* Round up to cut down on memory fragmentation */ | |
843 | newsize = (bim->size + 127) & ~(bfd_size_type) 127; | |
844 | if (newsize > oldsize) | |
845 | { | |
846 | bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize); | |
847 | if (bim->buffer == NULL) | |
848 | { | |
849 | errno = EINVAL; | |
850 | bim->size = 0; | |
851 | return -1; | |
852 | } | |
853 | memset (bim->buffer + oldsize, 0, newsize - oldsize); | |
854 | } | |
855 | } | |
65077aa8 | 856 | else |
07d6d2b8 AM |
857 | { |
858 | abfd->where = bim->size; | |
859 | errno = EINVAL; | |
860 | bfd_set_error (bfd_error_file_truncated); | |
861 | return -1; | |
862 | } | |
65077aa8 TG |
863 | } |
864 | return 0; | |
865 | } | |
866 | ||
405bf443 | 867 | static int |
65077aa8 TG |
868 | memory_bclose (struct bfd *abfd) |
869 | { | |
870 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; | |
871 | ||
c9594989 | 872 | free (bim->buffer); |
65077aa8 TG |
873 | free (bim); |
874 | abfd->iostream = NULL; | |
875 | ||
405bf443 | 876 | return 0; |
65077aa8 TG |
877 | } |
878 | ||
879 | static int | |
880 | memory_bflush (bfd *abfd ATTRIBUTE_UNUSED) | |
881 | { | |
882 | return 0; | |
883 | } | |
884 | ||
885 | static int | |
886 | memory_bstat (bfd *abfd, struct stat *statbuf) | |
887 | { | |
888 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; | |
889 | ||
b5dee4ea | 890 | memset (statbuf, 0, sizeof (*statbuf)); |
65077aa8 TG |
891 | statbuf->st_size = bim->size; |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | static void * | |
897 | memory_bmmap (bfd *abfd ATTRIBUTE_UNUSED, void *addr ATTRIBUTE_UNUSED, | |
4810a2d9 | 898 | size_t len ATTRIBUTE_UNUSED, int prot ATTRIBUTE_UNUSED, |
07d6d2b8 AM |
899 | int flags ATTRIBUTE_UNUSED, file_ptr offset ATTRIBUTE_UNUSED, |
900 | void **map_addr ATTRIBUTE_UNUSED, | |
4810a2d9 | 901 | size_t *map_len ATTRIBUTE_UNUSED) |
65077aa8 TG |
902 | { |
903 | return (void *)-1; | |
904 | } | |
905 | ||
906 | const struct bfd_iovec _bfd_memory_iovec = | |
907 | { | |
908 | &memory_bread, &memory_bwrite, &memory_btell, &memory_bseek, | |
909 | &memory_bclose, &memory_bflush, &memory_bstat, &memory_bmmap | |
910 | }; | |
6f567398 NC |
911 | |
912 | /* | |
913 | FUNCTION | |
914 | bfd_get_current_time | |
915 | ||
916 | SYNOPSIS | |
917 | time_t bfd_get_current_time (time_t now); | |
918 | ||
919 | DESCRIPTION | |
920 | Returns the current time. | |
921 | ||
922 | If the environment variable SOURCE_DATE_EPOCH is defined | |
923 | then this is parsed and its value is returned. Otherwise | |
924 | if the paramter NOW is non-zero, then that is returned. | |
925 | Otherwise the result of the system call "time(NULL)" is | |
926 | returned. | |
927 | */ | |
928 | ||
929 | time_t | |
930 | bfd_get_current_time (time_t now) | |
931 | { | |
932 | char *source_date_epoch; | |
933 | unsigned long long epoch; | |
934 | ||
935 | /* FIXME: We could probably cache this lookup, | |
936 | and the parsing of its value below. */ | |
937 | source_date_epoch = getenv ("SOURCE_DATE_EPOCH"); | |
938 | ||
939 | if (source_date_epoch == NULL) | |
940 | { | |
941 | if (now) | |
942 | return now; | |
943 | return time (NULL); | |
944 | } | |
945 | ||
946 | epoch = strtoull (source_date_epoch, NULL, 0); | |
947 | ||
948 | /* If epoch == 0 then something is wrong with SOURCE_DATE_EPOCH, | |
949 | but we do not have an easy way to report it. Since the presence | |
950 | of the environment variable implies that the user wants | |
951 | deterministic behaviour we just accept the 0 value. */ | |
952 | ||
953 | return (time_t) epoch; | |
954 | } |