55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
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/* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
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This file is part of the GNU IO Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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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
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not cause the resulting executable to be covered by the GNU General
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Public License. This exception does not however invalidate any
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other reasons why the executable file might be covered by the GNU
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General Public License. */
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#include <libioP.h>
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_IO_pos_t
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_IO_seekoff (fp, offset, dir, mode)
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_IO_FILE *fp;
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_IO_off_t offset;
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int dir;
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int mode;
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{
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_IO_pos_t retval;
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/* If we have a backup buffer, get rid of it, since the __seekoff
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callback may not know to do the right thing about it.
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This may be over-kill, but it'll do for now. TODO */
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_IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
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_IO_flockfile (fp);
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if (_IO_have_backup (fp))
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{
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if (dir == _IO_seek_cur && _IO_in_backup (fp))
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offset -= fp->_IO_read_end - fp->_IO_read_ptr;
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_IO_free_backup_area (fp);
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}
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retval = _IO_SEEKOFF (fp, offset, dir, mode);
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_IO_cleanup_region_end (1);
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return retval;
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}
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