1 /* Copyright (C) 1993-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>.
18 As a special exception, if you link the code in this file with
19 files compiled with a GNU compiler to produce an executable,
20 that does not cause the resulting executable to be covered by
21 the GNU Lesser General Public License. This exception does not
22 however invalidate any other reasons why the executable file
23 might be covered by the GNU Lesser General Public License.
24 This exception applies to code released by its copyright holders
25 in files containing the exception. */
27 /* Generic or default I/O operations. */
38 static _IO_lock_t list_all_lock = _IO_lock_initializer;
41 /* Used to signal modifications to the list of FILE decriptors. */
42 static int _IO_list_all_stamp;
45 static _IO_FILE *run_fp;
49 flush_cleanup (void *not_used)
52 _IO_funlockfile (run_fp);
53 _IO_lock_unlock (list_all_lock);
59 struct _IO_FILE_plus *fp;
61 if (fp->file._flags & _IO_LINKED)
65 _IO_cleanup_region_start_noarg (flush_cleanup);
66 _IO_lock_lock (list_all_lock);
67 run_fp = (_IO_FILE *) fp;
68 _IO_flockfile ((_IO_FILE *) fp);
70 if (_IO_list_all == NULL)
72 else if (fp == _IO_list_all)
74 _IO_list_all = (struct _IO_FILE_plus *) _IO_list_all->file._chain;
78 for (f = &_IO_list_all->file._chain; *f; f = &(*f)->_chain)
79 if (*f == (_IO_FILE *) fp)
85 fp->file._flags &= ~_IO_LINKED;
87 _IO_funlockfile ((_IO_FILE *) fp);
89 _IO_lock_unlock (list_all_lock);
90 _IO_cleanup_region_end (0);
94 libc_hidden_def (_IO_un_link)
98 struct _IO_FILE_plus *fp;
100 if ((fp->file._flags & _IO_LINKED) == 0)
102 fp->file._flags |= _IO_LINKED;
104 _IO_cleanup_region_start_noarg (flush_cleanup);
105 _IO_lock_lock (list_all_lock);
106 run_fp = (_IO_FILE *) fp;
107 _IO_flockfile ((_IO_FILE *) fp);
109 fp->file._chain = (_IO_FILE *) _IO_list_all;
111 ++_IO_list_all_stamp;
113 _IO_funlockfile ((_IO_FILE *) fp);
115 _IO_lock_unlock (list_all_lock);
116 _IO_cleanup_region_end (0);
120 libc_hidden_def (_IO_link_in)
122 /* Return minimum _pos markers
123 Assumes the current get area is the main get area. */
124 _IO_ssize_t _IO_least_marker (_IO_FILE *fp, char *end_p);
127 _IO_least_marker (fp, end_p)
131 _IO_ssize_t least_so_far = end_p - fp->_IO_read_base;
132 struct _IO_marker *mark;
133 for (mark = fp->_markers; mark != NULL; mark = mark->_next)
134 if (mark->_pos < least_so_far)
135 least_so_far = mark->_pos;
139 /* Switch current get area from backup buffer to (start of) main get area. */
142 _IO_switch_to_main_get_area (fp)
146 fp->_flags &= ~_IO_IN_BACKUP;
147 /* Swap _IO_read_end and _IO_save_end. */
148 tmp = fp->_IO_read_end;
149 fp->_IO_read_end = fp->_IO_save_end;
150 fp->_IO_save_end= tmp;
151 /* Swap _IO_read_base and _IO_save_base. */
152 tmp = fp->_IO_read_base;
153 fp->_IO_read_base = fp->_IO_save_base;
154 fp->_IO_save_base = tmp;
155 /* Set _IO_read_ptr. */
156 fp->_IO_read_ptr = fp->_IO_read_base;
159 /* Switch current get area from main get area to (end of) backup area. */
162 _IO_switch_to_backup_area (fp)
166 fp->_flags |= _IO_IN_BACKUP;
167 /* Swap _IO_read_end and _IO_save_end. */
168 tmp = fp->_IO_read_end;
169 fp->_IO_read_end = fp->_IO_save_end;
170 fp->_IO_save_end = tmp;
171 /* Swap _IO_read_base and _IO_save_base. */
172 tmp = fp->_IO_read_base;
173 fp->_IO_read_base = fp->_IO_save_base;
174 fp->_IO_save_base = tmp;
175 /* Set _IO_read_ptr. */
176 fp->_IO_read_ptr = fp->_IO_read_end;
180 _IO_switch_to_get_mode (fp)
183 if (fp->_IO_write_ptr > fp->_IO_write_base)
184 if (_IO_OVERFLOW (fp, EOF) == EOF)
186 if (_IO_in_backup (fp))
187 fp->_IO_read_base = fp->_IO_backup_base;
190 fp->_IO_read_base = fp->_IO_buf_base;
191 if (fp->_IO_write_ptr > fp->_IO_read_end)
192 fp->_IO_read_end = fp->_IO_write_ptr;
194 fp->_IO_read_ptr = fp->_IO_write_ptr;
196 fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = fp->_IO_read_ptr;
198 fp->_flags &= ~_IO_CURRENTLY_PUTTING;
201 libc_hidden_def (_IO_switch_to_get_mode)
204 _IO_free_backup_area (fp)
207 if (_IO_in_backup (fp))
208 _IO_switch_to_main_get_area (fp); /* Just in case. */
209 free (fp->_IO_save_base);
210 fp->_IO_save_base = NULL;
211 fp->_IO_save_end = NULL;
212 fp->_IO_backup_base = NULL;
214 libc_hidden_def (_IO_free_backup_area)
218 _IO_switch_to_put_mode (fp)
221 fp->_IO_write_base = fp->_IO_read_ptr;
222 fp->_IO_write_ptr = fp->_IO_read_ptr;
223 /* Following is wrong if line- or un-buffered? */
224 fp->_IO_write_end = (fp->_flags & _IO_IN_BACKUP
225 ? fp->_IO_read_end : fp->_IO_buf_end);
227 fp->_IO_read_ptr = fp->_IO_read_end;
228 fp->_IO_read_base = fp->_IO_read_end;
230 fp->_flags |= _IO_CURRENTLY_PUTTING;
240 /* This is a single-byte stream. */
243 return _IO_OVERFLOW (f, ch);
245 libc_hidden_def (__overflow)
247 static int save_for_backup (_IO_FILE *fp, char *end_p)
257 save_for_backup (fp, end_p)
261 /* Append [_IO_read_base..end_p] to backup area. */
262 _IO_ssize_t least_mark = _IO_least_marker (fp, end_p);
263 /* needed_size is how much space we need in the backup area. */
264 _IO_size_t needed_size = (end_p - fp->_IO_read_base) - least_mark;
265 /* FIXME: Dubious arithmetic if pointers are NULL */
266 _IO_size_t current_Bsize = fp->_IO_save_end - fp->_IO_save_base;
267 _IO_size_t avail; /* Extra space available for future expansion. */
269 struct _IO_marker *mark;
270 if (needed_size > current_Bsize)
274 new_buffer = (char *) malloc (avail + needed_size);
275 if (new_buffer == NULL)
276 return EOF; /* FIXME */
280 __mempcpy (__mempcpy (new_buffer + avail,
281 fp->_IO_save_end + least_mark,
284 end_p - fp->_IO_read_base);
286 memcpy (new_buffer + avail,
287 fp->_IO_save_end + least_mark,
289 memcpy (new_buffer + avail - least_mark,
291 end_p - fp->_IO_read_base);
295 memcpy (new_buffer + avail,
296 fp->_IO_read_base + least_mark,
298 free (fp->_IO_save_base);
299 fp->_IO_save_base = new_buffer;
300 fp->_IO_save_end = new_buffer + avail + needed_size;
304 avail = current_Bsize - needed_size;
307 memmove (fp->_IO_save_base + avail,
308 fp->_IO_save_end + least_mark,
310 memcpy (fp->_IO_save_base + avail - least_mark,
312 end_p - fp->_IO_read_base);
314 else if (needed_size > 0)
315 memcpy (fp->_IO_save_base + avail,
316 fp->_IO_read_base + least_mark,
319 fp->_IO_backup_base = fp->_IO_save_base + avail;
320 /* Adjust all the streammarkers. */
321 delta = end_p - fp->_IO_read_base;
322 for (mark = fp->_markers; mark != NULL; mark = mark->_next)
331 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
332 if (_IO_vtable_offset (fp) == 0 && _IO_fwide (fp, -1) != -1)
338 if (_IO_in_put_mode (fp))
339 if (_IO_switch_to_get_mode (fp) == EOF)
341 if (fp->_IO_read_ptr < fp->_IO_read_end)
342 return *(unsigned char *) fp->_IO_read_ptr;
343 if (_IO_in_backup (fp))
345 _IO_switch_to_main_get_area (fp);
346 if (fp->_IO_read_ptr < fp->_IO_read_end)
347 return *(unsigned char *) fp->_IO_read_ptr;
349 if (_IO_have_markers (fp))
351 if (save_for_backup (fp, fp->_IO_read_end))
354 else if (_IO_have_backup (fp))
355 _IO_free_backup_area (fp);
356 return _IO_UNDERFLOW (fp);
358 libc_hidden_def (__underflow)
364 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
365 if (_IO_vtable_offset (fp) == 0 && _IO_fwide (fp, -1) != -1)
371 if (_IO_in_put_mode (fp))
372 if (_IO_switch_to_get_mode (fp) == EOF)
374 if (fp->_IO_read_ptr < fp->_IO_read_end)
375 return *(unsigned char *) fp->_IO_read_ptr++;
376 if (_IO_in_backup (fp))
378 _IO_switch_to_main_get_area (fp);
379 if (fp->_IO_read_ptr < fp->_IO_read_end)
380 return *(unsigned char *) fp->_IO_read_ptr++;
382 if (_IO_have_markers (fp))
384 if (save_for_backup (fp, fp->_IO_read_end))
387 else if (_IO_have_backup (fp))
388 _IO_free_backup_area (fp);
389 return _IO_UFLOW (fp);
391 libc_hidden_def (__uflow)
394 _IO_setb (f, b, eb, a)
400 if (f->_IO_buf_base && !(f->_flags & _IO_USER_BUF))
401 FREE_BUF (f->_IO_buf_base, _IO_blen (f));
405 f->_flags &= ~_IO_USER_BUF;
407 f->_flags |= _IO_USER_BUF;
409 libc_hidden_def (_IO_setb)
415 if (fp->_IO_buf_base)
417 if (!(fp->_flags & _IO_UNBUFFERED) || fp->_mode > 0)
418 if (_IO_DOALLOCATE (fp) != EOF)
420 _IO_setb (fp, fp->_shortbuf, fp->_shortbuf+1, 0);
422 libc_hidden_def (_IO_doallocbuf)
425 _IO_default_underflow (fp)
432 _IO_default_uflow (fp)
435 int ch = _IO_UNDERFLOW (fp);
438 return *(unsigned char *) fp->_IO_read_ptr++;
440 libc_hidden_def (_IO_default_uflow)
443 _IO_default_xsputn (f, data, n)
448 const char *s = (char *) data;
454 /* Space available. */
455 if (f->_IO_write_ptr < f->_IO_write_end)
457 _IO_size_t count = f->_IO_write_end - f->_IO_write_ptr;
463 f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count);
465 memcpy (f->_IO_write_ptr, s, count);
466 f->_IO_write_ptr += count;
472 char *p = f->_IO_write_ptr;
474 for (i = count; --i >= 0; )
476 f->_IO_write_ptr = p;
480 if (more == 0 || _IO_OVERFLOW (f, (unsigned char) *s++) == EOF)
486 libc_hidden_def (_IO_default_xsputn)
489 _IO_sgetn (fp, data, n)
494 /* FIXME handle putback buffer here! */
495 return _IO_XSGETN (fp, data, n);
497 libc_hidden_def (_IO_sgetn)
500 _IO_default_xsgetn (fp, data, n)
506 char *s = (char*) data;
509 /* Data available. */
510 if (fp->_IO_read_ptr < fp->_IO_read_end)
512 _IO_size_t count = fp->_IO_read_end - fp->_IO_read_ptr;
518 s = __mempcpy (s, fp->_IO_read_ptr, count);
520 memcpy (s, fp->_IO_read_ptr, count);
523 fp->_IO_read_ptr += count;
527 char *p = fp->_IO_read_ptr;
531 fp->_IO_read_ptr = p;
535 if (more == 0 || __underflow (fp) == EOF)
540 libc_hidden_def (_IO_default_xsgetn)
543 /* Seems not to be needed. --drepper */
553 _IO_default_setbuf (fp, p, len)
558 if (_IO_SYNC (fp) == EOF)
560 if (p == NULL || len == 0)
562 fp->_flags |= _IO_UNBUFFERED;
563 _IO_setb (fp, fp->_shortbuf, fp->_shortbuf+1, 0);
567 fp->_flags &= ~_IO_UNBUFFERED;
568 _IO_setb (fp, p, p+len, 0);
570 fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = 0;
571 fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_read_end = 0;
576 _IO_default_seekpos (fp, pos, mode)
581 return _IO_SEEKOFF (fp, pos, 0, mode);
585 _IO_default_doallocate (fp)
590 ALLOC_BUF (buf, _IO_BUFSIZ, EOF);
591 _IO_setb (fp, buf, buf+_IO_BUFSIZ, 1);
594 libc_hidden_def (_IO_default_doallocate)
601 _IO_no_init (fp, flags, -1, NULL, NULL);
603 libc_hidden_def (_IO_init)
606 _IO_old_init (fp, flags)
610 fp->_flags = _IO_MAGIC|flags;
612 fp->_IO_buf_base = NULL;
613 fp->_IO_buf_end = NULL;
614 fp->_IO_read_base = NULL;
615 fp->_IO_read_ptr = NULL;
616 fp->_IO_read_end = NULL;
617 fp->_IO_write_base = NULL;
618 fp->_IO_write_ptr = NULL;
619 fp->_IO_write_end = NULL;
620 fp->_chain = NULL; /* Not necessary. */
622 fp->_IO_save_base = NULL;
623 fp->_IO_backup_base = NULL;
624 fp->_IO_save_end = NULL;
628 fp->_vtable_offset = 0;
631 if (fp->_lock != NULL)
632 _IO_lock_init (*fp->_lock);
637 _IO_no_init (fp, flags, orientation, wd, jmp)
641 struct _IO_wide_data *wd;
642 const struct _IO_jump_t *jmp;
644 _IO_old_init (fp, flags);
645 fp->_mode = orientation;
646 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
647 if (orientation >= 0)
650 fp->_wide_data->_IO_buf_base = NULL;
651 fp->_wide_data->_IO_buf_end = NULL;
652 fp->_wide_data->_IO_read_base = NULL;
653 fp->_wide_data->_IO_read_ptr = NULL;
654 fp->_wide_data->_IO_read_end = NULL;
655 fp->_wide_data->_IO_write_base = NULL;
656 fp->_wide_data->_IO_write_ptr = NULL;
657 fp->_wide_data->_IO_write_end = NULL;
658 fp->_wide_data->_IO_save_base = NULL;
659 fp->_wide_data->_IO_backup_base = NULL;
660 fp->_wide_data->_IO_save_end = NULL;
662 fp->_wide_data->_wide_vtable = jmp;
665 /* Cause predictable crash when a wide function is called on a byte
667 fp->_wide_data = (struct _IO_wide_data *) -1L;
669 fp->_freeres_list = NULL;
673 _IO_default_sync (fp)
679 /* The way the C++ classes are mapped into the C functions in the
680 current implementation, this function can get called twice! */
683 _IO_default_finish (fp, dummy)
687 struct _IO_marker *mark;
688 if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
690 FREE_BUF (fp->_IO_buf_base, _IO_blen (fp));
691 fp->_IO_buf_base = fp->_IO_buf_end = NULL;
694 for (mark = fp->_markers; mark != NULL; mark = mark->_next)
697 if (fp->_IO_save_base)
699 free (fp->_IO_save_base);
700 fp->_IO_save_base = NULL;
703 _IO_un_link ((struct _IO_FILE_plus *) fp);
706 if (fp->_lock != NULL)
707 _IO_lock_fini (*fp->_lock);
710 libc_hidden_def (_IO_default_finish)
713 _IO_default_seekoff (fp, offset, dir, mode)
723 _IO_sputbackc (fp, c)
729 if (fp->_IO_read_ptr > fp->_IO_read_base
730 && (unsigned char)fp->_IO_read_ptr[-1] == (unsigned char)c)
733 result = (unsigned char) c;
736 result = _IO_PBACKFAIL (fp, c);
739 fp->_flags &= ~_IO_EOF_SEEN;
743 libc_hidden_def (_IO_sputbackc)
751 if (fp->_IO_read_ptr > fp->_IO_read_base)
754 result = (unsigned char) *fp->_IO_read_ptr;
757 result = _IO_PBACKFAIL (fp, EOF);
760 fp->_flags &= ~_IO_EOF_SEEN;
765 #if 0 /* Work in progress */
766 /* Seems not to be needed. */
769 _IO_set_column (fp, c)
776 fp->_column = c - (fp->_IO_write_ptr - fp->_IO_write_base);
780 _IO_set_column (fp, i)
784 fp->_cur_column = i + 1;
792 _IO_adjust_column (start, line, count)
797 const char *ptr = line + count;
800 return line + count - ptr - 1;
801 return start + count;
803 libc_hidden_def (_IO_adjust_column)
806 /* Seems not to be needed. --drepper */
812 return _IO_adjust_column (fp->_cur_column - 1,
814 fp->_IO_write_ptr - fp->_IO_write_base);
821 _IO_flush_all_lockp (int do_lock)
828 __libc_cleanup_region_start (do_lock, flush_cleanup, NULL);
830 _IO_lock_lock (list_all_lock);
833 last_stamp = _IO_list_all_stamp;
834 fp = (_IO_FILE *) _IO_list_all;
841 if (((fp->_mode <= 0 && fp->_IO_write_ptr > fp->_IO_write_base)
842 #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
843 || (_IO_vtable_offset (fp) == 0
844 && fp->_mode > 0 && (fp->_wide_data->_IO_write_ptr
845 > fp->_wide_data->_IO_write_base))
848 && _IO_OVERFLOW (fp, EOF) == EOF)
852 _IO_funlockfile (fp);
855 if (last_stamp != _IO_list_all_stamp)
857 /* Something was added to the list. Start all over again. */
858 fp = (_IO_FILE *) _IO_list_all;
859 last_stamp = _IO_list_all_stamp;
867 _IO_lock_unlock (list_all_lock);
868 __libc_cleanup_region_end (0);
878 /* We want locking. */
879 return _IO_flush_all_lockp (1);
881 libc_hidden_def (_IO_flush_all)
884 _IO_flush_all_linebuffered (void)
890 _IO_cleanup_region_start_noarg (flush_cleanup);
891 _IO_lock_lock (list_all_lock);
894 last_stamp = _IO_list_all_stamp;
895 fp = (_IO_FILE *) _IO_list_all;
901 if ((fp->_flags & _IO_NO_WRITES) == 0 && fp->_flags & _IO_LINE_BUF)
902 _IO_OVERFLOW (fp, EOF);
904 _IO_funlockfile (fp);
907 if (last_stamp != _IO_list_all_stamp)
909 /* Something was added to the list. Start all over again. */
910 fp = (_IO_FILE *) _IO_list_all;
911 last_stamp = _IO_list_all_stamp;
918 _IO_lock_unlock (list_all_lock);
919 _IO_cleanup_region_end (0);
922 libc_hidden_def (_IO_flush_all_linebuffered)
924 weak_alias (_IO_flush_all_linebuffered, _flushlbf)
928 /* The following is a bit tricky. In general, we want to unbuffer the
929 streams so that all output which follows is seen. If we are not
930 looking for memory leaks it does not make much sense to free the
931 actual buffer because this will happen anyway once the program
932 terminated. If we do want to look for memory leaks we have to free
933 the buffers. Whether something is freed is determined by the
934 function sin the libc_freeres section. Those are called as part of
935 the atexit routine, just like _IO_cleanup. The problem is we do
936 not know whether the freeres code is called first or _IO_cleanup.
937 if the former is the case, we set the DEALLOC_BUFFER variable to
938 true and _IO_unbuffer_write will take care of the rest. If
939 _IO_unbuffer_write is called first we add the streams to a list
940 which the freeres function later can walk through. */
941 static void _IO_unbuffer_write (void);
943 static bool dealloc_buffers;
944 static _IO_FILE *freeres_list;
947 _IO_unbuffer_write (void)
950 for (fp = (_IO_FILE *) _IO_list_all; fp; fp = fp->_chain)
952 if (! (fp->_flags & _IO_UNBUFFERED)
953 && (! (fp->_flags & _IO_NO_WRITES)
954 || (fp->_flags & _IO_IS_APPENDING))
955 /* Iff stream is un-orientated, it wasn't used. */
961 for (cnt = 0; cnt < MAXTRIES; ++cnt)
962 if (fp->_lock == NULL || _IO_lock_trylock (*fp->_lock) == 0)
965 /* Give the other thread time to finish up its use of the
970 if (! dealloc_buffers && !(fp->_flags & _IO_USER_BUF))
972 fp->_flags |= _IO_USER_BUF;
974 fp->_freeres_list = freeres_list;
976 fp->_freeres_buf = fp->_IO_buf_base;
977 fp->_freeres_size = _IO_blen (fp);
980 _IO_SETBUF (fp, NULL, 0);
983 if (cnt < MAXTRIES && fp->_lock != NULL)
984 _IO_lock_unlock (*fp->_lock);
988 /* Make sure that never again the wide char functions can be
995 libc_freeres_fn (buffer_free)
997 dealloc_buffers = true;
999 while (freeres_list != NULL)
1001 FREE_BUF (freeres_list->_freeres_buf, freeres_list->_freeres_size);
1003 freeres_list = freeres_list->_freeres_list;
1011 /* We do *not* want locking. Some threads might use streams but
1012 that is their problem, we flush them underneath them. */
1013 int result = _IO_flush_all_lockp (0);
1015 /* We currently don't have a reliable mechanism for making sure that
1016 C++ static destructors are executed in the correct order.
1017 So it is possible that other static destructors might want to
1018 write to cout - and they're supposed to be able to do so.
1020 The following will make the standard streambufs be unbuffered,
1021 which forces any output from late destructors to be written out. */
1022 _IO_unbuffer_write ();
1029 _IO_init_marker (marker, fp)
1030 struct _IO_marker *marker;
1034 if (_IO_in_put_mode (fp))
1035 _IO_switch_to_get_mode (fp);
1036 if (_IO_in_backup (fp))
1037 marker->_pos = fp->_IO_read_ptr - fp->_IO_read_end;
1039 marker->_pos = fp->_IO_read_ptr - fp->_IO_read_base;
1041 /* Should perhaps sort the chain? */
1042 marker->_next = fp->_markers;
1043 fp->_markers = marker;
1047 _IO_remove_marker (marker)
1048 struct _IO_marker *marker;
1050 /* Unlink from sb's chain. */
1051 struct _IO_marker **ptr = &marker->_sbuf->_markers;
1052 for (; ; ptr = &(*ptr)->_next)
1056 else if (*ptr == marker)
1058 *ptr = marker->_next;
1063 if _sbuf has a backup area that is no longer needed, should we delete
1064 it now, or wait until the next underflow?
1068 #define BAD_DELTA EOF
1071 _IO_marker_difference (mark1, mark2)
1072 struct _IO_marker *mark1;
1073 struct _IO_marker *mark2;
1075 return mark1->_pos - mark2->_pos;
1078 /* Return difference between MARK and current position of MARK's stream. */
1080 _IO_marker_delta (mark)
1081 struct _IO_marker *mark;
1084 if (mark->_sbuf == NULL)
1086 if (_IO_in_backup (mark->_sbuf))
1087 cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_end;
1089 cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_base;
1090 return mark->_pos - cur_pos;
1094 _IO_seekmark (fp, mark, delta)
1096 struct _IO_marker *mark;
1099 if (mark->_sbuf != fp)
1101 if (mark->_pos >= 0)
1103 if (_IO_in_backup (fp))
1104 _IO_switch_to_main_get_area (fp);
1105 fp->_IO_read_ptr = fp->_IO_read_base + mark->_pos;
1109 if (!_IO_in_backup (fp))
1110 _IO_switch_to_backup_area (fp);
1111 fp->_IO_read_ptr = fp->_IO_read_end + mark->_pos;
1117 _IO_unsave_markers (fp)
1120 struct _IO_marker *mark = fp->_markers;
1124 streampos offset = seekoff (0, ios::cur, ios::in);
1127 offset += eGptr () - Gbase ();
1128 for ( ; mark != NULL; mark = mark->_next)
1129 mark->set_streampos (mark->_pos + offset);
1133 for ( ; mark != NULL; mark = mark->_next)
1134 mark->set_streampos (EOF);
1140 if (_IO_have_backup (fp))
1141 _IO_free_backup_area (fp);
1143 libc_hidden_def (_IO_unsave_markers)
1146 /* Seems not to be needed. --drepper */
1148 _IO_nobackup_pbackfail (fp, c)
1152 if (fp->_IO_read_ptr > fp->_IO_read_base)
1154 if (c != EOF && *fp->_IO_read_ptr != c)
1155 *fp->_IO_read_ptr = c;
1156 return (unsigned char) c;
1161 _IO_default_pbackfail (fp, c)
1165 if (fp->_IO_read_ptr > fp->_IO_read_base && !_IO_in_backup (fp)
1166 && (unsigned char) fp->_IO_read_ptr[-1] == c)
1170 /* Need to handle a filebuf in write mode (switch to read mode). FIXME!*/
1171 if (!_IO_in_backup (fp))
1173 /* We need to keep the invariant that the main get area
1174 logically follows the backup area. */
1175 if (fp->_IO_read_ptr > fp->_IO_read_base && _IO_have_backup (fp))
1177 if (save_for_backup (fp, fp->_IO_read_ptr))
1180 else if (!_IO_have_backup (fp))
1182 /* No backup buffer: allocate one. */
1183 /* Use nshort buffer, if unused? (probably not) FIXME */
1184 int backup_size = 128;
1185 char *bbuf = (char *) malloc (backup_size);
1188 fp->_IO_save_base = bbuf;
1189 fp->_IO_save_end = fp->_IO_save_base + backup_size;
1190 fp->_IO_backup_base = fp->_IO_save_end;
1192 fp->_IO_read_base = fp->_IO_read_ptr;
1193 _IO_switch_to_backup_area (fp);
1195 else if (fp->_IO_read_ptr <= fp->_IO_read_base)
1197 /* Increase size of existing backup buffer. */
1198 _IO_size_t new_size;
1199 _IO_size_t old_size = fp->_IO_read_end - fp->_IO_read_base;
1201 new_size = 2 * old_size;
1202 new_buf = (char *) malloc (new_size);
1203 if (new_buf == NULL)
1205 memcpy (new_buf + (new_size - old_size), fp->_IO_read_base,
1207 free (fp->_IO_read_base);
1208 _IO_setg (fp, new_buf, new_buf + (new_size - old_size),
1209 new_buf + new_size);
1210 fp->_IO_backup_base = fp->_IO_read_ptr;
1213 *--fp->_IO_read_ptr = c;
1215 return (unsigned char) c;
1217 libc_hidden_def (_IO_default_pbackfail)
1220 _IO_default_seek (fp, offset, dir)
1229 _IO_default_stat (fp, st)
1237 _IO_default_read (fp, data, n)
1246 _IO_default_write (fp, data, n)
1255 _IO_default_showmanyc (fp)
1262 _IO_default_imbue (fp, locale)
1269 _IO_iter_begin (void)
1271 return (_IO_ITER) _IO_list_all;
1273 libc_hidden_def (_IO_iter_begin)
1280 libc_hidden_def (_IO_iter_end)
1286 return iter->_chain;
1288 libc_hidden_def (_IO_iter_next)
1296 libc_hidden_def (_IO_iter_file)
1299 _IO_list_lock (void)
1301 #ifdef _IO_MTSAFE_IO
1302 _IO_lock_lock (list_all_lock);
1305 libc_hidden_def (_IO_list_lock)
1308 _IO_list_unlock (void)
1310 #ifdef _IO_MTSAFE_IO
1311 _IO_lock_unlock (list_all_lock);
1314 libc_hidden_def (_IO_list_unlock)
1317 _IO_list_resetlock (void)
1319 #ifdef _IO_MTSAFE_IO
1320 _IO_lock_init (list_all_lock);
1323 libc_hidden_def (_IO_list_resetlock)
1328 #define IO_CLEANUP ;
1336 ~__io_defs() { _IO_cleanup (); }
1338 __io_defs io_defs__;
1343 #ifdef text_set_element
1344 text_set_element(__libc_atexit, _IO_cleanup);