mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/* Copyright (C) 1993-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>.
|
|
|
|
As a special exception, if you link the code in this file with
|
|
files compiled with a GNU compiler to produce an executable,
|
|
that does not cause the resulting executable to be covered by
|
|
the GNU Lesser General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file
|
|
might be covered by the GNU Lesser General Public License.
|
|
This exception applies to code released by its copyright holders
|
|
in files containing the exception. */
|
|
|
|
#include "libioP.h"
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
/* ANSI explicily requires setting errno to a positive value on failure. */
|
|
|
|
long int
|
|
_IO_ftell (fp)
|
|
_IO_FILE *fp;
|
|
{
|
|
_IO_off64_t pos;
|
|
CHECK_FILE (fp, -1L);
|
|
_IO_acquire_lock (fp);
|
|
pos = _IO_seekoff_unlocked (fp, 0, _IO_seek_cur, 0);
|
|
if (_IO_in_backup (fp) && pos != _IO_pos_BAD)
|
|
{
|
|
if (_IO_vtable_offset (fp) != 0 || fp->_mode <= 0)
|
|
pos -= fp->_IO_save_end - fp->_IO_save_base;
|
|
}
|
|
_IO_release_lock (fp);
|
|
if (pos == _IO_pos_BAD)
|
|
{
|
|
#ifdef EIO
|
|
if (errno == 0)
|
|
__set_errno (EIO);
|
|
#endif
|
|
return -1L;
|
|
}
|
|
if ((_IO_off64_t) (long int) pos != pos)
|
|
{
|
|
#ifdef EOVERFLOW
|
|
__set_errno (EOVERFLOW);
|
|
#endif
|
|
return -1L;
|
|
}
|
|
return pos;
|
|
}
|
|
libc_hidden_def (_IO_ftell)
|
|
|
|
#ifdef weak_alias
|
|
weak_alias (_IO_ftell, ftell)
|
|
#endif
|