iconv/gconv.c

   1 /* Convert characters in input buffer using conversion descriptor to
   2    output buffer.
   3    Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <assert.h>
  23 #include <gconv.h>
  24 #include <sys/param.h>
  25
  26 #include <ldsodefs.h>
  27
  28 int
  29 internal_function
  30 __gconv (gconv_t cd, const char **inbuf, const char *inbufend, char **outbuf,
  31          char *outbufend, size_t *converted)
  32 {
  33   size_t last_step = cd->nsteps - 1;
  34   int result;
  35
  36   if (cd == (gconv_t) -1L)
  37     return GCONV_ILLEGAL_DESCRIPTOR;
  38
  39   assert (converted != NULL);
  40   *converted = 0;
  41
  42   if (inbuf == NULL || *inbuf == NULL)
  43     /* We just flush.  */
  44     result = _CALL_DL_FCT (cd->steps->fct,
  45                            (cd->steps, cd->data, NULL, NULL, converted, 1));
  46   else
  47     {
  48       const char *last_start;
  49
  50       assert (outbuf != NULL && *outbuf != NULL);
  51       cd->data[last_step].outbuf = *outbuf;
  52       cd->data[last_step].outbufend = outbufend;
  53
  54       do
  55         {
  56           last_start = *inbuf;
  57           result = _CALL_DL_FCT (cd->steps->fct,
  58                                  (cd->steps, cd->data, inbuf, inbufend,
  59                                   converted, 0));
  60         }
  61       while (result == GCONV_EMPTY_INPUT && last_start != *inbuf
  62              && *inbuf + cd->steps->min_needed_from <= inbufend);
  63     }
  64
  65   if (outbuf != NULL && *outbuf != NULL)
  66     *outbuf = cd->data[last_step].outbuf;
  67
  68   return result;
  69 }