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glibc  2.9
iofgetpos64.c
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00001 /* Copyright (C) 1993, 1995-2001, 2002, 2003, 2004
00002    Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.
00019 
00020    As a special exception, if you link the code in this file with
00021    files compiled with a GNU compiler to produce an executable,
00022    that does not cause the resulting executable to be covered by
00023    the GNU Lesser General Public License.  This exception does not
00024    however invalidate any other reasons why the executable file
00025    might be covered by the GNU Lesser General Public License.
00026    This exception applies to code released by its copyright holders
00027    in files containing the exception.  */
00028 
00029 #include "libioP.h"
00030 #include <errno.h>
00031 #include <shlib-compat.h>
00032 
00033 
00034 int
00035 _IO_new_fgetpos64 (fp, posp)
00036      _IO_FILE *fp;
00037      _IO_fpos64_t *posp;
00038 {
00039 #ifdef _G_LSEEK64
00040   _IO_off64_t pos;
00041   int result = 0;
00042   CHECK_FILE (fp, EOF);
00043   _IO_acquire_lock (fp);
00044   pos = _IO_seekoff_unlocked (fp, 0, _IO_seek_cur, 0);
00045   if (_IO_in_backup (fp) && pos != _IO_pos_BAD)
00046     {
00047       if (fp->_mode <= 0)
00048        pos -= fp->_IO_save_end - fp->_IO_save_base;
00049     }
00050   if (pos == _IO_pos_BAD)
00051     {
00052       /* ANSI explicitly requires setting errno to a positive value on
00053         failure.  */
00054 # ifdef EIO
00055       if (errno == 0)
00056        __set_errno (EIO);
00057 # endif
00058       result = EOF;
00059     }
00060   else
00061     {
00062       posp->__pos = pos;
00063       if (fp->_mode > 0
00064          && (*fp->_codecvt->__codecvt_do_encoding) (fp->_codecvt) < 0)
00065        /* This is a stateful encoding, safe the state.  */
00066        posp->__state = fp->_wide_data->_IO_state;
00067     }
00068   _IO_release_lock (fp);
00069   return result;
00070 #else
00071   __set_errno (ENOSYS);
00072   return EOF;
00073 #endif
00074 }
00075 
00076 strong_alias (_IO_new_fgetpos64, __new_fgetpos64)
00077 versioned_symbol (libc, _IO_new_fgetpos64, _IO_fgetpos64, GLIBC_2_2);
00078 versioned_symbol (libc, __new_fgetpos64, fgetpos64, GLIBC_2_2);