lib/gb18030.h

/*
 * Copyright (C) 1999-2000 Free Software Foundation, Inc.
 * This file is part of the GNU LIBICONV Library.
 *
 * The GNU LIBICONV Library is free software; you can redistribute it
 * and/or modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * The GNU LIBICONV Library is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
 * If not, write to the Free Software Foundation, Inc., 59 Temple Place -
 * Suite 330, Boston, MA 02111-1307, USA.
 */

/*
 * GB18030
 */

/*
 * GB18030, as implemented in glibc-2.2, is an extension of GBK (= CP936).
 * It adds the following ranges:
 * 1. Two-byte range
 *    0xA2E3, 0xA8BF, 0xA98A..0xA995, 0xFE50..0xFE9F
 * 2. Four-byte range
 *    0x{81..84}{30..39}{81..FE}{30..39}
 *    Most of Unicode plane 1 in Unicode order.
 */

#include "gb18030ext.h"
#include "gb18030uni.h"

static int
gb18030_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
  int ret;

  /* Code set 0 (ASCII) */
  if (*s < 0x80)
    return ascii_mbtowc(conv,pwc,s,n);

  /* Code set 1 (GBK extended) */
  ret = gbk_mbtowc(conv,pwc,s,n);
  if (ret != RET_ILSEQ)
    return ret;

  ret = gb18030ext_mbtowc(conv,pwc,s,n);
  if (ret != RET_ILSEQ)
    return ret;

  /* Code set 2 (remainder of Unicode) */
  return gb18030uni_mbtowc(conv,pwc,s,n);
}

static int
gb18030_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
  int ret;

  /* Code set 0 (ASCII) */
  ret = ascii_wctomb(conv,r,wc,n);
  if (ret != RET_ILSEQ)
    return ret;

  /* Code set 1 (GBK extended) */
  ret = gbk_wctomb(conv,r,wc,n);
  if (ret != RET_ILSEQ)
    return ret;

  ret = gb18030ext_wctomb(conv,r,wc,n);
  if (ret != RET_ILSEQ)
    return ret;

  /* Code set 2 (remainder of Unicode) */
  return gb18030uni_wctomb(conv,r,wc,n);
}