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Diffstat (limited to 'libio/ioftell.c')
| -rw-r--r-- | libio/ioftell.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/libio/ioftell.c b/libio/ioftell.c new file mode 100644 index 0000000..8af2ce7 --- /dev/null +++ b/libio/ioftell.c @@ -0,0 +1,47 @@ +/* +Copyright (C) 1993, 1995 Free Software Foundation + +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); + pos = _IO_seekoff (fp, 0, _IO_seek_cur, 0); + if (pos == _IO_pos_BAD) + { +#ifdef EIO + if (errno == 0) + errno = EIO; +#endif + return -1L; + } + return _IO_pos_as_off (pos); +} + +weak_alias (_IO_ftell, ftell) |