iconv/gconv_close.c

   1 /* Release any resource associated with given conversion descriptor.
   2    Copyright (C) 1997-2013 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 Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdlib.h>
  21
  22 #include <gconv_int.h>
  23
  24
  25 int
  26 internal_function
  27 __gconv_close (__gconv_t cd)
  28 {
  29   struct __gconv_step *srunp;
  30   struct __gconv_step_data *drunp;
  31   size_t nsteps;
  32
  33   /* Free all resources by calling destructor functions and release
  34      the implementations.  */
  35   srunp = cd->__steps;
  36   nsteps = cd->__nsteps;
  37   drunp = cd->__data;
  38   do
  39     {
  40       struct __gconv_trans_data *transp;
  41
  42       transp = drunp->__trans;
  43       while (transp != NULL)
  44         {
  45           struct __gconv_trans_data *curp = transp;
  46           transp = transp->__next;
  47
  48           if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
  49             curp->__trans_end_fct (curp->__data);
  50
  51           free (curp);
  52         }
  53
  54       if (!(drunp->__flags & __GCONV_IS_LAST) && drunp->__outbuf != NULL)
  55         free (drunp->__outbuf);
  56     }
  57   while (!((drunp++)->__flags & __GCONV_IS_LAST));
  58
  59   /* Free the data allocated for the descriptor.  */
  60   free (cd);
  61
  62   /* Close the participating modules.  */
  63   return __gconv_close_transform (srunp, nsteps);
  64 }