1  /* Copyright (C) 1993-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.
      17  
      18     As a special exception, if you link the code in this file with
      19     files compiled with a GNU compiler to produce an executable,
      20     that does not cause the resulting executable to be covered by
      21     the GNU Lesser General Public License.  This exception does not
      22     however invalidate any other reasons why the executable file
      23     might be covered by the GNU Lesser General Public License.
      24     This exception applies to code released by its copyright holders
      25     in files containing the exception.  */
      26  
      27  /* We need to avoid the header declarations of these, because
      28     the types don't match _IO_fgetpos and then the compiler will
      29     complain about the mismatch when we do the alias below.  */
      30  #define _IO_new_fgetpos64 __renamed__IO_new_fgetpos64
      31  #define _IO_fgetpos64 __renamed__IO_fgetpos64
      32  #define fgetpos64 __renamed_fgetpos64
      33  
      34  #include "libioP.h"
      35  
      36  #undef _IO_new_fgetpos64
      37  #undef _IO_fgetpos64
      38  #undef fgetpos64
      39  
      40  #include <errno.h>
      41  #include <stdlib.h>
      42  #include <shlib-compat.h>
      43  
      44  int
      45  _IO_new_fgetpos (FILE *fp, __fpos_t *posp)
      46  {
      47    off64_t pos;
      48    int result = 0;
      49    CHECK_FILE (fp, EOF);
      50    _IO_acquire_lock (fp);
      51    pos = _IO_seekoff_unlocked (fp, 0, _IO_seek_cur, 0);
      52    if (_IO_in_backup (fp) && pos != _IO_pos_BAD)
      53      {
      54        if (fp->_mode <= 0)
      55  	pos -= fp->_IO_save_end - fp->_IO_save_base;
      56      }
      57    if (pos == _IO_pos_BAD)
      58      {
      59        /* ANSI explicitly requires setting errno to a positive value on
      60  	 failure.  */
      61        if (errno == 0)
      62  	__set_errno (EIO);
      63        result = EOF;
      64      }
      65    else if ((off64_t) (__typeof (posp->__pos)) pos != pos)
      66      {
      67        __set_errno (EOVERFLOW);
      68        result = EOF;
      69      }
      70    else
      71      {
      72        posp->__pos = pos;
      73        if (fp->_mode > 0 && __libio_codecvt_encoding (fp->_codecvt) < 0)
      74  	/* This is a stateful encoding, safe the state.  */
      75  	posp->__state = fp->_wide_data->_IO_state;
      76      }
      77  
      78    _IO_release_lock (fp);
      79    return result;
      80  }
      81  
      82  strong_alias (_IO_new_fgetpos, __new_fgetpos)
      83  versioned_symbol (libc, _IO_new_fgetpos, _IO_fgetpos, GLIBC_2_2);
      84  versioned_symbol (libc, __new_fgetpos, fgetpos, GLIBC_2_2);
      85  
      86  #ifdef __OFF_T_MATCHES_OFF64_T
      87  strong_alias (_IO_new_fgetpos, _IO_new_fgetpos64)
      88  strong_alias (_IO_new_fgetpos64, __new_fgetpos64)
      89  versioned_symbol (libc, _IO_new_fgetpos64, _IO_fgetpos64, GLIBC_2_2);
      90  versioned_symbol (libc, __new_fgetpos64, fgetpos64, GLIBC_2_2);
      91  #endif