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54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* Copyright (C) 1993, 1995, 1996, 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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#include <errno.h>
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/* ANSI explicily requires setting errno to a positive value on failure. */
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long int
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_IO_ftell (fp)
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_IO_FILE *fp;
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{
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_IO_pos_t pos;
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CHECK_FILE (fp, -1L);
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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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pos = _IO_seekoff (fp, 0, _IO_seek_cur, 0);
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_IO_cleanup_region_end (1);
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if (pos == _IO_pos_BAD)
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{
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#ifdef EIO
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if (errno == 0)
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__set_errno (EIO);
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#endif
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return -1L;
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}
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return _IO_pos_as_off (pos);
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}
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#ifdef weak_alias
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weak_alias (_IO_ftell, ftell)
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#endif
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