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
  27 int
  28 internal_function
  29 __gconv (gconv_t cd, const char **inbuf, const char *inbufend, char **outbuf,
  30          char *outbufend, size_t *converted)
  31 {
  32   size_t last_step = cd->nsteps - 1;
  33   int result;
  34
  35   if (cd == (gconv_t) -1L)
  36     return GCONV_ILLEGAL_DESCRIPTOR;
  37
  38   assert (converted != NULL);
  39   *converted = 0;
  40
  41   if (inbuf == NULL || *inbuf == NULL)
  42     /* We just flush.  */
  43     result = (*cd->steps->fct) (cd->steps, cd->data, NULL, NULL, converted, 1);
  44   else
  45     {
  46       const char *last_start;
  47
  48       assert (outbuf != NULL && *outbuf != NULL);
  49       cd->data[last_step].outbuf = *outbuf;
  50       cd->data[last_step].outbufend = outbufend;
  51
  52       do
  53         {
  54           last_start = *inbuf;
  55           result = (*cd->steps->fct) (cd->steps, cd->data, inbuf, inbufend,
  56                                       converted, 0);
  57         }
  58       while (result == GCONV_EMPTY_INPUT && last_start != *inbuf
  59              && *inbuf + cd->steps->min_needed_from <= inbufend);
  60     }
  61
  62   if (outbuf != NULL && *outbuf != NULL)
  63     *outbuf = cd->data[last_step].outbuf;
  64
  65   return result;
  66 }