iconv/gconv_close.c

   1 /* Release any resource associated with given conversion descriptor.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <gconv.h>
  22 #include <stdlib.h>
  23
  24
  25 int
  26 __gconv_close (gconv_t cd)
  27 {
  28   struct gconv_step *srunp;
  29   struct gconv_step_data *drunp;
  30   size_t nsteps;
  31
  32   /* Free all resources by calling destructor functions and release
  33      the implementations.  */
  34   srunp = cd->steps;
  35   nsteps = cd->nsteps;
  36   drunp = cd->data;
  37   do
  38     {
  39       /* Call destructor.  */
  40       if (srunp->end_fct != NULL)
  41         (*srunp->end_fct) (drunp);
  42       else
  43         if (drunp->data != NULL)
  44           free (drunp->data);
  45
  46       if (!drunp->is_last && drunp->outbuf != NULL)
  47         free (drunp->outbuf);
  48
  49       /* Next step.  */
  50       ++srunp;
  51     }
  52   while (!(drunp++)->is_last);
  53
  54   /* Save the pointer, we need it below.  */
  55   srunp = cd->steps;
  56
  57   /* Free the data allocated for the descriptor.  */
  58   free (cd->data);
  59   free (cd);
  60
  61   /* Close the participating modules.  */
  62   return __gconv_close_transform (srunp, nsteps);
  63 }