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