libstdc++-v3/libio/iofclose.c

   1 /* Copyright (C) 1993, 1995, 1997-1999, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3
   4    This library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License as
   6    published by the Free Software Foundation; either version 2, or (at
   7    your option) any later version.
   8
   9    This library is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this library; see the file COPYING.  If not, write to
  16    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  17    MA 02111-1307, 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
  21    not cause the resulting executable to be covered by the GNU General
  22    Public License.  This exception does not however invalidate any
  23    other reasons why the executable file might be covered by the GNU
  24    General Public License.  */
  25
  26 #include "libioP.h"
  27 #ifdef __STDC__
  28 #include <stdlib.h>
  29 #endif
  30 #if _LIBC
  31 # include "../iconv/gconv_int.h"
  32 # include <shlib-compat.h>
  33 #else
  34 # define SHLIB_COMPAT(a, b, c) 0
  35 # define _IO_new_fclose fclose
  36 #endif
  37
  38 int
  39 _IO_new_fclose (fp)
  40      _IO_FILE *fp;
  41 {
  42   int status;
  43
  44   CHECK_FILE(fp, EOF);
  45
  46 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  47   /* We desperately try to help programs which are using streams in a
  48      strange way and mix old and new functions.  Detect old streams
  49      here.  */
  50   if (fp->_vtable_offset != 0)
  51     return _IO_old_fclose (fp);
  52 #endif
  53
  54   _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
  55   _IO_flockfile (fp);
  56   if (fp->_IO_file_flags & _IO_IS_FILEBUF)
  57     status = _IO_file_close_it (fp);
  58   else
  59     status = fp->_flags & _IO_ERR_SEEN ? -1 : 0;
  60   _IO_FINISH (fp);
  61   _IO_funlockfile (fp);
  62   if (fp->_mode > 0)
  63     {
  64 #if _LIBC
  65       /* This stream has a wide orientation.  This means we have to free
  66          the conversion functions.  */
  67       struct _IO_codecvt *cc = fp->_codecvt;
  68
  69       if (cc->__cd_in.__cd.__steps->__shlib_handle != NULL)
  70         {
  71           --cc->__cd_in.__cd.__steps->__counter;
  72           __gconv_close_transform (cc->__cd_in.__cd.__steps, 1);
  73         }
  74       if (cc->__cd_out.__cd.__steps->__shlib_handle != NULL)
  75         {
  76           --cc->__cd_out.__cd.__steps->__counter;
  77           __gconv_close_transform (cc->__cd_out.__cd.__steps, 1);
  78         }
  79 #endif
  80     }
  81   _IO_cleanup_region_end (0);
  82   if (_IO_have_backup (fp))
  83     _IO_free_backup_area (fp);
  84   if (fp != _IO_stdin && fp != _IO_stdout && fp != _IO_stderr)
  85     {
  86       fp->_IO_file_flags = 0;
  87       free(fp);
  88     }
  89
  90   return status;
  91 }
  92
  93 #ifdef _LIBC
  94 versioned_symbol (libc, _IO_new_fclose, _IO_fclose, GLIBC_2_1);
  95 strong_alias (_IO_new_fclose, __new_fclose)
  96 versioned_symbol (libc, __new_fclose, fclose, GLIBC_2_1);
  97 #endif