mirror of
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5acb90c9b6
a small amount of unused stuff (by the bmakefiles to follow), but it isn't much and seems harmless enough.
853 lines
20 KiB
C
853 lines
20 KiB
C
/*
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Copyright (C) 1993, 1995 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/* Generic or default I/O operations. */
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#include "libioP.h"
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#ifdef __STDC__
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#include <stdlib.h>
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#endif
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#include <string.h>
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void
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DEFUN(_IO_un_link, (fp),
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_IO_FILE *fp)
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{
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if (fp->_flags & _IO_LINKED) {
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_IO_FILE **f;
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for (f = &_IO_list_all; *f != NULL; f = &(*f)->_chain) {
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if (*f == fp) {
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*f = fp->_chain;
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break;
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}
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}
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fp->_flags &= ~_IO_LINKED;
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}
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}
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void
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DEFUN(_IO_link_in, (fp),
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_IO_FILE *fp)
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{
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if ((fp->_flags & _IO_LINKED) == 0) {
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fp->_flags |= _IO_LINKED;
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fp->_chain = _IO_list_all;
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_IO_list_all = fp;
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}
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}
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/* Return minimum _pos markers
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Assumes the current get area is the main get area. */
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_IO_size_t
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DEFUN(_IO_least_marker, (fp),
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register _IO_FILE *fp)
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{
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_IO_ssize_t least_so_far = fp->_IO_read_end - fp->_IO_read_base;
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register struct _IO_marker *mark;
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for (mark = fp->_markers; mark != NULL; mark = mark->_next)
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if (mark->_pos < least_so_far)
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least_so_far = mark->_pos;
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return least_so_far;
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}
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/* Switch current get area from backup buffer to (start of) main get area. */
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void
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DEFUN(_IO_switch_to_main_get_area, (fp),
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_IO_FILE *fp)
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{
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char *tmp;
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fp->_flags &= ~_IO_IN_BACKUP;
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/* Swap _IO_read_end and _IO_save_end. */
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tmp = fp->_IO_read_end; fp->_IO_read_end= fp->_IO_save_end; fp->_IO_save_end= tmp;
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/* Swap _IO_read_base and _IO_save_base. */
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tmp = fp->_IO_read_base; fp->_IO_read_base = fp->_IO_save_base; fp->_IO_save_base = tmp;
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fp->_IO_read_ptr = fp->_IO_read_base;
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}
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/* Switch current get area from main get area to (end of) backup area. */
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void
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DEFUN(_IO_switch_to_backup_area, (fp),
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register _IO_FILE *fp)
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{
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char *tmp;
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fp->_flags |= _IO_IN_BACKUP;
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/* Swap _IO_read_end and _IO_save_end. */
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tmp = fp->_IO_read_end; fp->_IO_read_end = fp->_IO_save_end; fp->_IO_save_end = tmp;
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/* Swap _gbase and _IO_save_base. */
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tmp = fp->_IO_read_base; fp->_IO_read_base = fp->_IO_save_base; fp->_IO_save_base = tmp;
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fp->_IO_read_ptr = fp->_IO_read_end;
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}
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int
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DEFUN(_IO_switch_to_get_mode, (fp),
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register _IO_FILE *fp)
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{
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if (fp->_IO_write_ptr > fp->_IO_write_base)
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if (_IO_OVERFLOW (fp, EOF) == EOF)
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return EOF;
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if (_IO_in_backup(fp))
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fp->_IO_read_base = fp->_IO_backup_base;
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else
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{
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fp->_IO_read_base = fp->_IO_buf_base;
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if (fp->_IO_write_ptr > fp->_IO_read_end)
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fp->_IO_read_end = fp->_IO_write_ptr;
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}
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fp->_IO_read_ptr = fp->_IO_write_ptr;
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fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = fp->_IO_read_ptr;
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fp->_flags &= ~_IO_CURRENTLY_PUTTING;
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return 0;
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}
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void
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DEFUN(_IO_free_backup_area, (fp),
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register _IO_FILE *fp)
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{
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if (_IO_in_backup (fp))
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_IO_switch_to_main_get_area(fp); /* Just in case. */
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free (fp->_IO_save_base);
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fp->_IO_save_base = NULL;
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fp->_IO_save_end = NULL;
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fp->_IO_backup_base = NULL;
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}
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#if 0
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int
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DEFUN(_IO_switch_to_put_mode, (fp),
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register _IO_FILE *fp)
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{
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fp->_IO_write_base = fp->_IO_read_ptr;
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fp->_IO_write_ptr = fp->_IO_read_ptr;
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/* Following is wrong if line- or un-buffered? */
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fp->_IO_write_end = fp->_flags & _IO_IN_BACKUP ? fp->_IO_read_end : fp->_IO_buf_end;
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fp->_IO_read_ptr = fp->_IO_read_end;
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fp->_IO_read_base = fp->_IO_read_end;
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fp->_flags |= _IO_CURRENTLY_PUTTING;
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return 0;
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}
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#endif
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int
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DEFUN(__overflow, (f, ch),
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_IO_FILE *f AND int ch)
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{
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return _IO_OVERFLOW (f, ch);
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}
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static int
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DEFUN(save_for_backup, (fp),
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_IO_FILE *fp)
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{
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/* Append [_IO_read_base.._IO_read_end] to backup area. */
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int least_mark = _IO_least_marker(fp);
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/* needed_size is how much space we need in the backup area. */
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int needed_size = (fp->_IO_read_end - fp->_IO_read_base) - least_mark;
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int current_Bsize = fp->_IO_save_end - fp->_IO_save_base;
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int avail; /* Extra space available for future expansion. */
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int delta;
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struct _IO_marker *mark;
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if (needed_size > current_Bsize)
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{
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char *new_buffer;
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avail = 100;
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new_buffer = (char*)malloc(avail+needed_size);
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if (new_buffer == NULL)
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return EOF; /* FIXME */
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if (least_mark < 0)
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{
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memcpy(new_buffer + avail,
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fp->_IO_save_end + least_mark,
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-least_mark);
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memcpy(new_buffer +avail - least_mark,
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fp->_IO_read_base,
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fp->_IO_read_end - fp->_IO_read_base);
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}
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else
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memcpy(new_buffer + avail,
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fp->_IO_read_base + least_mark,
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needed_size);
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if (fp->_IO_save_base)
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free (fp->_IO_save_base);
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fp->_IO_save_base = new_buffer;
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fp->_IO_save_end = new_buffer + avail + needed_size;
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}
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else
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{
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avail = current_Bsize - needed_size;
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if (least_mark < 0)
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{
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memmove(fp->_IO_save_base + avail,
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fp->_IO_save_end + least_mark,
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-least_mark);
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memcpy(fp->_IO_save_base + avail - least_mark,
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fp->_IO_read_base,
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fp->_IO_read_end - fp->_IO_read_base);
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}
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else if (needed_size > 0)
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memcpy(fp->_IO_save_base + avail,
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fp->_IO_read_base + least_mark,
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needed_size);
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}
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/* FIXME: Dubious arithmetic if pointers are NULL */
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fp->_IO_backup_base = fp->_IO_save_base + avail;
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/* Adjust all the streammarkers. */
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delta = fp->_IO_read_end - fp->_IO_read_base;
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for (mark = fp->_markers; mark != NULL; mark = mark->_next)
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mark->_pos -= delta;
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return 0;
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}
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int
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DEFUN(__underflow, (fp),
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_IO_FILE *fp)
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{
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if (_IO_in_put_mode(fp))
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if (_IO_switch_to_get_mode(fp) == EOF) return EOF;
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if (fp->_IO_read_ptr < fp->_IO_read_end)
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return *(unsigned char*)fp->_IO_read_ptr;
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if (_IO_in_backup(fp))
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{
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_IO_switch_to_main_get_area(fp);
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if (fp->_IO_read_ptr < fp->_IO_read_end)
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return *fp->_IO_read_ptr;
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}
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if (_IO_have_markers(fp))
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{
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if (save_for_backup (fp))
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return EOF;
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}
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else if (_IO_have_backup(fp))
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_IO_free_backup_area(fp);
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return _IO_UNDERFLOW (fp);
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}
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int
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DEFUN(__uflow, (fp),
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_IO_FILE *fp)
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{
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if (_IO_in_put_mode(fp))
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if (_IO_switch_to_get_mode(fp) == EOF) return EOF;
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if (fp->_IO_read_ptr < fp->_IO_read_end)
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return *(unsigned char*)fp->_IO_read_ptr++;
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if (_IO_in_backup(fp))
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{
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_IO_switch_to_main_get_area(fp);
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if (fp->_IO_read_ptr < fp->_IO_read_end)
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return *fp->_IO_read_ptr++;
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}
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if (_IO_have_markers(fp))
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{
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if (save_for_backup (fp))
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return EOF;
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}
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else if (_IO_have_backup(fp))
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_IO_free_backup_area(fp);
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return _IO_UFLOW (fp);
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}
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void
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DEFUN(_IO_setb, (f, b, eb, a),
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_IO_FILE *f AND char *b AND char *eb AND int a)
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{
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if (f->_IO_buf_base && !(f->_flags & _IO_USER_BUF))
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FREE_BUF(f->_IO_buf_base);
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f->_IO_buf_base = b;
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f->_IO_buf_end = eb;
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if (a)
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f->_flags &= ~_IO_USER_BUF;
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else
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f->_flags |= _IO_USER_BUF;
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}
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void
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DEFUN(_IO_doallocbuf, (fp),
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register _IO_FILE *fp)
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{
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if (fp->_IO_buf_base)
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return;
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if (!(fp->_flags & _IO_UNBUFFERED))
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if (_IO_DOALLOCATE (fp) != EOF)
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return;
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_IO_setb(fp, fp->_shortbuf, fp->_shortbuf+1, 0);
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}
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int
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DEFUN(_IO_default_underflow, (fp),
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_IO_FILE *fp)
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{
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return EOF;
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}
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int
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DEFUN(_IO_default_uflow, (fp),
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_IO_FILE *fp)
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{
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int ch = _IO_UNDERFLOW (fp);
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if (ch == EOF)
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return EOF;
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return *(unsigned char*)fp->_IO_read_ptr++;
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}
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_IO_size_t
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DEFUN(_IO_default_xsputn, (f, data, n),
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register _IO_FILE *f AND const void *data AND _IO_size_t n)
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{
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register const char *s = (char*) data;
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register _IO_size_t more = n;
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if (more <= 0)
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return 0;
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for (;;)
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{
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_IO_ssize_t count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */
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if (count > 0)
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{
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if (count > more)
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count = more;
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if (count > 20)
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{
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memcpy(f->_IO_write_ptr, s, count);
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s += count;
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f->_IO_write_ptr += count;
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}
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else if (count <= 0)
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count = 0;
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else
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{
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register char *p = f->_IO_write_ptr;
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register _IO_ssize_t i;
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for (i = count; --i >= 0; ) *p++ = *s++;
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f->_IO_write_ptr = p;
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}
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more -= count;
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}
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if (more == 0 || __overflow(f, (unsigned char)*s++) == EOF)
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break;
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more--;
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}
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return n - more;
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}
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_IO_size_t
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DEFUN(_IO_sgetn, (fp, data, n),
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_IO_FILE *fp AND void *data AND _IO_size_t n)
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{
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/* FIXME handle putback buffer here! */
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return _IO_XSGETN (fp, data, n);
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}
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_IO_size_t
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DEFUN(_IO_default_xsgetn, (fp, data, n),
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_IO_FILE *fp AND void *data AND _IO_size_t n)
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{
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register _IO_size_t more = n;
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register char *s = (char*) data;
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for (;;)
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{
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_IO_ssize_t count = fp->_IO_read_end - fp->_IO_read_ptr; /* Data available. */
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if (count > 0)
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{
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if (count > more)
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count = more;
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if (count > 20)
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{
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memcpy(s, fp->_IO_read_ptr, count);
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s += count;
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fp->_IO_read_ptr += count;
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}
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else if (count <= 0)
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count = 0;
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else
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{
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register char *p = fp->_IO_read_ptr;
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register int i = (int)count;
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while (--i >= 0) *s++ = *p++;
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fp->_IO_read_ptr = p;
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}
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more -= count;
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}
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if (more == 0 || __underflow(fp) == EOF)
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break;
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}
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return n - more;
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}
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int
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DEFUN(_IO_sync, (fp),
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register _IO_FILE *fp)
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{
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return 0;
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}
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_IO_FILE*
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DEFUN(_IO_default_setbuf, (fp, p, len),
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register _IO_FILE *fp AND char* p AND _IO_ssize_t len)
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{
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if (_IO_SYNC (fp) == EOF)
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return NULL;
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if (p == NULL || len == 0)
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{
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fp->_flags |= _IO_UNBUFFERED;
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_IO_setb(fp, fp->_shortbuf, fp->_shortbuf+1, 0);
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}
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else
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{
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fp->_flags &= ~_IO_UNBUFFERED;
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_IO_setb(fp, p, p+len, 0);
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}
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fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = 0;
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fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_read_end = 0;
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return fp;
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}
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_IO_pos_t
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DEFUN(_IO_default_seekpos, (fp, pos, mode),
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_IO_FILE *fp AND _IO_pos_t pos AND int mode)
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{
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return _IO_SEEKOFF (fp, _IO_pos_as_off(pos), 0, mode);
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}
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int
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DEFUN(_IO_default_doallocate, (fp),
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_IO_FILE *fp)
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{
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char *buf = ALLOC_BUF(_IO_BUFSIZ);
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if (buf == NULL)
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return EOF;
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_IO_setb(fp, buf, buf+_IO_BUFSIZ, 1);
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return 1;
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}
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void
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DEFUN(_IO_init, (fp, flags),
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register _IO_FILE *fp AND int flags)
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{
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fp->_flags = _IO_MAGIC|flags;
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fp->_IO_buf_base = NULL;
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fp->_IO_buf_end = NULL;
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fp->_IO_read_base = NULL;
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fp->_IO_read_ptr = NULL;
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fp->_IO_read_end = NULL;
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fp->_IO_write_base = NULL;
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fp->_IO_write_ptr = NULL;
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fp->_IO_write_end = NULL;
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fp->_chain = NULL; /* Not necessary. */
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fp->_IO_save_base = NULL;
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fp->_IO_backup_base = NULL;
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fp->_IO_save_end = NULL;
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fp->_markers = NULL;
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fp->_cur_column = 0;
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}
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int
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DEFUN(_IO_default_sync, (fp),
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_IO_FILE *fp)
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{
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return 0;
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}
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/* The way the C++ classes are mapped into the C functions in the
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current implementation, this function can get called twice! */
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void
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DEFUN(_IO_default_finish, (fp),
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_IO_FILE *fp)
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{
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struct _IO_marker *mark;
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if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
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{
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FREE_BUF(fp->_IO_buf_base);
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fp->_IO_buf_base = fp->_IO_buf_end = NULL;
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}
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for (mark = fp->_markers; mark != NULL; mark = mark->_next)
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mark->_sbuf = NULL;
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if (fp->_IO_save_base)
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{
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free (fp->_IO_save_base);
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fp->_IO_save_base = NULL;
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}
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_IO_un_link(fp);
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}
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_IO_pos_t
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DEFUN(_IO_default_seekoff, (fp, offset, dir, mode),
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register _IO_FILE *fp AND _IO_off_t offset AND int dir AND int mode)
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{
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return _IO_pos_BAD;
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}
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int
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DEFUN(_IO_sputbackc, (fp, c),
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|
register _IO_FILE *fp AND int c)
|
|
{
|
|
int result;
|
|
|
|
if (fp->_IO_read_ptr > fp->_IO_read_base
|
|
&& (unsigned char)fp->_IO_read_ptr[-1] == (unsigned char)c)
|
|
{
|
|
fp->_IO_read_ptr--;
|
|
result = (unsigned char)c;
|
|
}
|
|
else
|
|
result = _IO_PBACKFAIL (fp, c);
|
|
|
|
if (result != EOF)
|
|
fp->_flags &= ~_IO_EOF_SEEN;
|
|
|
|
return result;
|
|
}
|
|
|
|
int
|
|
DEFUN(_IO_sungetc, (fp),
|
|
register _IO_FILE *fp)
|
|
{
|
|
int result;
|
|
|
|
if (fp->_IO_read_ptr > fp->_IO_read_base)
|
|
{
|
|
fp->_IO_read_ptr--;
|
|
result = (unsigned char)*fp->_IO_read_ptr;
|
|
}
|
|
else
|
|
result = _IO_PBACKFAIL (fp, EOF);
|
|
|
|
if (result != EOF)
|
|
fp->_flags &= ~_IO_EOF_SEEN;
|
|
|
|
return result;
|
|
}
|
|
|
|
#if 0 /* Work in progress */
|
|
void
|
|
DEFUN(_IO_set_column, (fp, c),
|
|
register _IO_FILE *fp AND int c)
|
|
{
|
|
if (c == -1)
|
|
fp->_column = -1;
|
|
else
|
|
fp->_column = c - (fp->_IO_write_ptr - fp->_IO_write_base);
|
|
}
|
|
#else
|
|
int
|
|
DEFUN(_IO_set_column, (fp, i),
|
|
register _IO_FILE *fp AND int i)
|
|
{
|
|
fp->_cur_column = i+1;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
unsigned
|
|
DEFUN(_IO_adjust_column, (start, line, count),
|
|
unsigned start AND const char *line AND int count)
|
|
{
|
|
register const char *ptr = line + count;
|
|
while (ptr > line)
|
|
if (*--ptr == '\n')
|
|
return line + count - ptr - 1;
|
|
return start + count;
|
|
}
|
|
|
|
int
|
|
DEFUN(_IO_get_column, (fp),
|
|
register _IO_FILE *fp)
|
|
{
|
|
if (fp->_cur_column)
|
|
return _IO_adjust_column(fp->_cur_column - 1,
|
|
fp->_IO_write_base,
|
|
fp->_IO_write_ptr - fp->_IO_write_base);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
DEFUN_VOID(_IO_flush_all)
|
|
{
|
|
int result = 0;
|
|
_IO_FILE *fp;
|
|
for (fp = _IO_list_all; fp != NULL; fp = fp->_chain)
|
|
if (fp->_IO_write_ptr > fp->_IO_write_base
|
|
&& _IO_OVERFLOW (fp, EOF) == EOF)
|
|
result = EOF;
|
|
return result;
|
|
}
|
|
|
|
void
|
|
DEFUN_VOID(_IO_flush_all_linebuffered)
|
|
{
|
|
_IO_FILE *fp;
|
|
for (fp = _IO_list_all; fp != NULL; fp = fp->_chain)
|
|
if (fp->_flags & _IO_LINE_BUF)
|
|
_IO_OVERFLOW (fp, EOF);
|
|
}
|
|
|
|
void
|
|
DEFUN_VOID(_IO_unbuffer_all)
|
|
{
|
|
_IO_FILE *fp;
|
|
for (fp = _IO_list_all; fp != NULL; fp = fp->_chain)
|
|
if (! (fp->_flags & _IO_UNBUFFERED))
|
|
_IO_SETBUF (fp, NULL, 0);
|
|
}
|
|
|
|
void
|
|
DEFUN_VOID(_IO_cleanup)
|
|
{
|
|
_IO_flush_all ();
|
|
|
|
/* We currently don't have a reliable mechanism for making sure that
|
|
C++ static destructors are executed in the correct order.
|
|
So it is possible that other static destructord might want to
|
|
write to cout - and they're supposed to be able to do so.
|
|
|
|
The following will make the standard streambufs be unbuffered,
|
|
which forces any output from late destructors to be written out. */
|
|
_IO_unbuffer_all ();
|
|
}
|
|
|
|
void
|
|
DEFUN(_IO_init_marker, (marker, fp),
|
|
struct _IO_marker *marker AND _IO_FILE *fp)
|
|
{
|
|
marker->_sbuf = fp;
|
|
if (_IO_in_put_mode(fp))
|
|
_IO_switch_to_get_mode(fp);
|
|
if (_IO_in_backup(fp))
|
|
marker->_pos = fp->_IO_read_ptr - fp->_IO_read_end;
|
|
else
|
|
marker->_pos = fp->_IO_read_ptr - fp->_IO_read_base;
|
|
|
|
/* Should perhaps sort the chain? */
|
|
marker->_next = fp->_markers;
|
|
fp->_markers = marker;
|
|
}
|
|
|
|
void
|
|
DEFUN(_IO_remove_marker, (marker),
|
|
register struct _IO_marker *marker)
|
|
{
|
|
/* Unlink from sb's chain. */
|
|
register struct _IO_marker **ptr = &marker->_sbuf->_markers;
|
|
for (; ; ptr = &(*ptr)->_next)
|
|
{
|
|
if (*ptr == NULL)
|
|
break;
|
|
else if (*ptr == marker)
|
|
{
|
|
*ptr = marker->_next;
|
|
return;
|
|
}
|
|
}
|
|
#if 0
|
|
if _sbuf has a backup area that is no longer needed, should we delete
|
|
it now, or wait until the next underflow?
|
|
#endif
|
|
}
|
|
|
|
#define BAD_DELTA EOF
|
|
|
|
int
|
|
DEFUN(_IO_marker_difference, (mark1, mark2),
|
|
struct _IO_marker *mark1 AND struct _IO_marker *mark2)
|
|
{
|
|
return mark1->_pos - mark2->_pos;
|
|
}
|
|
|
|
/* Return difference between MARK and current posistion of MARK's stream. */
|
|
int
|
|
DEFUN(_IO_marker_delta, (mark),
|
|
struct _IO_marker *mark)
|
|
{
|
|
int cur_pos;
|
|
if (mark->_sbuf == NULL)
|
|
return BAD_DELTA;
|
|
if (_IO_in_backup(mark->_sbuf))
|
|
cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_end;
|
|
else
|
|
cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_base;
|
|
return mark->_pos - cur_pos;
|
|
}
|
|
|
|
int
|
|
DEFUN(_IO_seekmark, (fp, mark, delta),
|
|
_IO_FILE *fp AND struct _IO_marker *mark AND int delta)
|
|
{
|
|
if (mark->_sbuf != fp)
|
|
return EOF;
|
|
if (mark->_pos >= 0)
|
|
{
|
|
if (_IO_in_backup(fp))
|
|
_IO_switch_to_main_get_area(fp);
|
|
fp->_IO_read_ptr = fp->_IO_read_base + mark->_pos;
|
|
}
|
|
else
|
|
{
|
|
if (!_IO_in_backup(fp))
|
|
_IO_switch_to_backup_area(fp);
|
|
fp->_IO_read_ptr = fp->_IO_read_end + mark->_pos;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
DEFUN(_IO_unsave_markers, (fp),
|
|
register _IO_FILE *fp)
|
|
{
|
|
register struct _IO_marker *mark = fp->_markers;
|
|
if (mark)
|
|
{
|
|
#ifdef TODO
|
|
streampos offset = seekoff(0, ios::cur, ios::in);
|
|
if (offset != EOF)
|
|
{
|
|
offset += eGptr() - Gbase();
|
|
for ( ; mark != NULL; mark = mark->_next)
|
|
mark->set_streampos(mark->_pos + offset);
|
|
}
|
|
else
|
|
{
|
|
for ( ; mark != NULL; mark = mark->_next)
|
|
mark->set_streampos(EOF);
|
|
}
|
|
#endif
|
|
fp->_markers = 0;
|
|
}
|
|
|
|
if (_IO_have_backup(fp))
|
|
_IO_free_backup_area(fp);
|
|
}
|
|
|
|
int
|
|
DEFUN(_IO_nobackup_pbackfail, (fp, c),
|
|
register _IO_FILE *fp AND int c)
|
|
{
|
|
if (fp->_IO_read_ptr > fp->_IO_read_base)
|
|
fp->_IO_read_ptr--;
|
|
if (c != EOF && *fp->_IO_read_ptr != c)
|
|
*fp->_IO_read_ptr = c;
|
|
return (unsigned char)c;
|
|
}
|
|
|
|
int
|
|
DEFUN(_IO_default_pbackfail, (fp, c),
|
|
register _IO_FILE *fp AND int c)
|
|
{
|
|
if (fp->_IO_read_ptr <= fp->_IO_read_base)
|
|
{
|
|
/* Need to handle a filebuf in write mode (switch to read mode). FIXME!*/
|
|
if (_IO_have_backup(fp) && !_IO_in_backup(fp))
|
|
_IO_switch_to_backup_area(fp);
|
|
|
|
if (!_IO_have_backup(fp))
|
|
{
|
|
/* No backup buffer: allocate one. */
|
|
/* Use nshort buffer, if unused? (probably not) FIXME */
|
|
int backup_size = 128;
|
|
char *bbuf = (char*)malloc(backup_size);
|
|
if (bbuf == NULL)
|
|
return EOF;
|
|
fp->_IO_save_base = bbuf;
|
|
fp->_IO_save_end = fp->_IO_save_base + backup_size;
|
|
fp->_IO_backup_base = fp->_IO_save_end;
|
|
_IO_switch_to_backup_area(fp);
|
|
}
|
|
else if (fp->_IO_read_ptr <= fp->_IO_read_base)
|
|
{
|
|
/* Increase size of existing backup buffer. */
|
|
_IO_size_t new_size;
|
|
_IO_size_t old_size = fp->_IO_read_end - fp->_IO_read_base;
|
|
char *new_buf;
|
|
new_size = 2 * old_size;
|
|
new_buf = (char*)malloc(new_size);
|
|
if (new_buf == NULL)
|
|
return EOF;
|
|
memcpy(new_buf+(new_size-old_size), fp->_IO_read_base, old_size);
|
|
free (fp->_IO_read_base);
|
|
_IO_setg(fp,
|
|
new_buf, new_buf+(new_size-old_size), new_buf+new_size);
|
|
fp->_IO_backup_base = fp->_IO_read_ptr;
|
|
}
|
|
}
|
|
fp->_IO_read_ptr--;
|
|
if (c != EOF && *fp->_IO_read_ptr != c)
|
|
*fp->_IO_read_ptr = c;
|
|
return (unsigned char)*fp->_IO_read_ptr;
|
|
}
|
|
|
|
_IO_pos_t
|
|
DEFUN(_IO_default_seek, (fp, offset, dir),
|
|
_IO_FILE *fp AND _IO_off_t offset AND int dir)
|
|
{
|
|
return _IO_pos_BAD;
|
|
}
|
|
|
|
int
|
|
DEFUN(_IO_default_stat, (fp, st),
|
|
_IO_FILE *fp AND void* st)
|
|
{
|
|
return EOF;
|
|
}
|
|
|
|
_IO_ssize_t
|
|
DEFUN(_IO_default_read, (fp, data, n),
|
|
register _IO_FILE* fp AND void* data AND _IO_ssize_t n)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
_IO_ssize_t
|
|
DEFUN(_IO_default_write, (fp, data, n),
|
|
register _IO_FILE* fp AND const void* data AND _IO_ssize_t n)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef TODO
|
|
#if defined(linux)
|
|
#define IO_CLEANUP ;
|
|
#endif
|
|
|
|
#ifdef IO_CLEANUP
|
|
IO_CLEANUP
|
|
#else
|
|
struct __io_defs {
|
|
__io_defs() { }
|
|
~__io_defs() { _IO_cleanup(); }
|
|
};
|
|
__io_defs io_defs__;
|
|
#endif
|
|
|
|
#endif /* TODO */
|