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Annotation of GNUtools/libg++/libio/ioseekoff.c, revision 1.1

1.1     ! root        1: /* 
        !             2: Copyright (C) 1993 Free Software Foundation
        !             3: 
        !             4: This file is part of the GNU IO Library.  This library is free
        !             5: software; you can redistribute it and/or modify it under the
        !             6: terms of the GNU General Public License as published by the
        !             7: Free Software Foundation; either version 2, or (at your option)
        !             8: any later version.
        !             9: 
        !            10: This library is distributed in the hope that it will be useful,
        !            11: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            13: GNU General Public License for more details.
        !            14: 
        !            15: You should have received a copy of the GNU General Public License
        !            16: along with GNU CC; see the file COPYING.  If not, write to
        !            17: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
        !            18: 
        !            19: As a special exception, if you link this library with files
        !            20: compiled with a GNU compiler to produce an executable, this does not cause
        !            21: the resulting executable to be covered by the GNU General Public License.
        !            22: This exception does not however invalidate any other reasons why
        !            23: the executable file might be covered by the GNU General Public License. */
        !            24: 
        !            25: #include <libioP.h>
        !            26: 
        !            27: _IO_pos_t
        !            28: _IO_seekoff(fp, offset, flags)
        !            29:      _IO_FILE* fp;
        !            30:      _IO_off_t offset;
        !            31:      _IO_seekflags flags;
        !            32: {
        !            33:   int dir = flags & 3;
        !            34: 
        !            35:   /* If we have a backup buffer, get rid of it, since the __seekoff
        !            36:      callback may not know to do the right thing about it.
        !            37:      This may be over-kill, but it'll do for now. TODO */
        !            38: 
        !            39:   if (_IO_have_backup (fp))
        !            40:     {
        !            41:       if (dir == _IO_seek_cur && _IO_in_backup (fp))
        !            42:        offset -= fp->_IO_read_end - fp->_IO_read_ptr;
        !            43:       _IO_free_backup_area (fp);
        !            44:     }
        !            45: 
        !            46:   return fp->_jumps->__seekoff(fp, offset, flags);
        !            47: }

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