46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
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/*
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Copyright (C) 1993 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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#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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DEFUN(_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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pos = _IO_seekoff(fp, 0, _IO_seek_cur, 0);
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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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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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