iconv/gconv.c

   1 /* Convert characters in input buffer using conversion descriptor to
   2    output buffer.
   3    Copyright (C) 1997, 1998, 1999 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 #include <dlfcn.h>
  26
  27 int
  28 internal_function
  29 __gconv (__gconv_t cd, const unsigned char **inbuf,
  30          const unsigned char *inbufend, unsigned char **outbuf,
  31          unsigned 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   cd->__data[last_step].__outbuf = outbuf != NULL ? *outbuf : NULL;
  43   cd->__data[last_step].__outbufend = outbufend;
  44
  45   if (inbuf == NULL || *inbuf == NULL)
  46     /* We just flush.  */
  47     result = DL_CALL_FCT (cd->__steps->__fct,
  48                            (cd->__steps, cd->__data, NULL, NULL,
  49                             converted, 1));
  50   else
  51     {
  52       const unsigned char *last_start;
  53
  54       assert (outbuf != NULL && *outbuf != NULL);
  55
  56       do
  57         {
  58           last_start = *inbuf;
  59           result = DL_CALL_FCT (cd->__steps->__fct,
  60                                  (cd->__steps, cd->__data, inbuf, inbufend,
  61                                   converted, 0));
  62         }
  63       while (result == __GCONV_EMPTY_INPUT && last_start != *inbuf
  64              && *inbuf + cd->__steps->__min_needed_from <= inbufend);
  65     }
  66
  67   if (outbuf != NULL && *outbuf != NULL)
  68     *outbuf = cd->__data[last_step].__outbuf;
  69
  70   return result;
  71 }