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Annotation of GNUtools/libg++/libio/ioftell.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: #include <errno.h>
        !            27: /* ANSI explicily requires setting errno to a positive value on failure. */
        !            28: 
        !            29: long int
        !            30: _IO_ftell(fp)
        !            31:      _IO_FILE* fp;
        !            32: {
        !            33:   _IO_pos_t pos;
        !            34:   COERCE_FILE(fp);
        !            35:   pos = _IO_seekoff(fp, 0, _IO_seek_cur|_IO_seek_not_in|_IO_seek_not_out);
        !            36:   if (pos == _IO_pos_BAD)
        !            37:     {
        !            38: #ifdef EIO
        !            39:       if (errno == 0)
        !            40:        errno = EIO;
        !            41: #endif
        !            42:       return -1L;
        !            43:     }
        !            44:   return _IO_pos_as_off(pos);
        !            45: }

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