| /* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc. |
| This file is part of the GNU IO Library. |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2, or (at |
| your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this library; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, Boston, |
| MA 02111-1307, USA. |
| |
| As a special exception, if you link this library with files |
| compiled with a GNU compiler to produce an executable, this does |
| not cause the resulting executable to be covered by the GNU General |
| Public License. This exception does not however invalidate any |
| other reasons why the executable file might be covered by the GNU |
| General Public License. */ |
| |
| #include "libioP.h" |
| #include <errno.h> |
| /* ANSI explicily requires setting errno to a positive value on failure. */ |
| |
| long int |
| _IO_ftell (fp) |
| _IO_FILE *fp; |
| { |
| _IO_pos_t pos; |
| CHECK_FILE (fp, -1L); |
| _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp); |
| _IO_flockfile (fp); |
| pos = _IO_seekoff (fp, 0, _IO_seek_cur, 0); |
| _IO_cleanup_region_end (1); |
| if (pos == _IO_pos_BAD) |
| { |
| #ifdef EIO |
| if (errno == 0) |
| __set_errno (EIO); |
| #endif |
| return -1L; |
| } |
| return _IO_pos_as_off (pos); |
| } |
| |
| #ifdef weak_alias |
| weak_alias (_IO_ftell, ftell) |
| #endif |