iconv/gconv.c

   1 /* Convert characters in input buffer using conversion descriptor to
   2    output buffer.
   3    Copyright (C) 1997 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 <gconv.h>
  23
  24
  25 int
  26 internal_function
  27 __gconv (gconv_t cd, const char **inbuf, size_t *inbytesleft, char **outbuf,
  28          size_t *outbytesleft, size_t *converted)
  29 {
  30   size_t last_step = cd->nsteps - 1;
  31   size_t oldinbytes = *inbytesleft;
  32   int result;
  33
  34   if (cd == (gconv_t) -1L)
  35     return GCONV_ILLEGAL_DESCRIPTOR;
  36
  37   cd->data[last_step].outbuf = *outbuf;
  38   cd->data[last_step].outbufavail = 0;
  39   cd->data[last_step].outbufsize = *outbytesleft;
  40
  41   if (converted != NULL)
  42     *converted = 0;
  43
  44   result = (*cd->steps->fct) (cd->steps, cd->data, *inbuf, inbytesleft,
  45                               converted, inbuf == NULL || *inbuf == NULL);
  46
  47   *inbuf += oldinbytes - *inbytesleft;
  48   *outbuf += cd->data[last_step].outbufavail;
  49   *outbytesleft -= cd->data[last_step].outbufavail;
  50
  51   return result;
  52 }