text: /*
   * Copyright (C) 2001, 2005, 2016 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, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * DEC-HANYU
   */
  
  static int
  dec_hanyu_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  {
    unsigned char c = *s;
    /* Code set 0 (ASCII) */
    if (c < 0x80)
      return ascii_mbtowc(conv,pwc,s,n);
    /* Code set 1 (CNS 11643-1992 Plane 1),
       Code set 2 (CNS 11643-1992 Plane 2),
       Code set 3 (CNS 11643-1992 Plane 3) */
    if (c >= 0xa1 && c < 0xff) {
      if (n < 2)
        return RET_TOOFEW(0);
      {
        unsigned char c2 = s[1];
        if (c == 0xc2 && c2 == 0xcb) {
          if (n < 4)
            return RET_TOOFEW(0);
          if (s[2] >= 0xa1 && s[2] < 0xff && s[3] >= 0xa1 && s[3] < 0xff) {
            unsigned char buf[2];
            int ret;
            buf[0] = s[2]-0x80; buf[1] = s[3]-0x80;
            ret = cns11643_3_mbtowc(conv,pwc,buf,2);
            if (ret != RET_ILSEQ) {
              if (ret != 2) abort();
              return 4;
            }
          }
        } else if (c2 >= 0xa1 && c2 < 0xff) {
          if (c != 0xc2 || c2 < 0xc2) {
            unsigned char buf[2];
            buf[0] = c-0x80; buf[1] = c2-0x80;
            return cns11643_1_mbtowc(conv,pwc,buf,2);
          }
        } else if (c2 >= 0x21 && c2 < 0x7f) {
          unsigned char buf[2];
          buf[0] = c-0x80; buf[1] = c2;
          return cns11643_2_mbtowc(conv,pwc,buf,2);
        }
      }
    }
    return RET_ILSEQ;
  }
  
  static int
  dec_hanyu_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  {
    unsigned char buf[3];
    int ret;
  
    /* Code set 0 (ASCII) */
    ret = ascii_wctomb(conv,r,wc,n);
    if (ret != RET_ILUNI)
      return ret;
  
    ret = cns11643_wctomb(conv,buf,wc,3);
    if (ret != RET_ILUNI) {
      if (ret != 3) abort();
  
      /* Code set 1 (CNS 11643-1992 Plane 1) */
      if (buf[0] == 1 && (buf[1] != 0x42 || buf[2] < 0x42)) {
        if (n < 2)
          return RET_TOOSMALL;
        r[0] = buf[1]+0x80;
        r[1] = buf[2]+0x80;
        return 2;
      }
  
      /* Code set 2 (CNS 11643-1992 Plane 2) */
      if (buf[0] == 2) {
        if (n < 2)
          return RET_TOOSMALL;
        r[0] = buf[1]+0x80;
        r[1] = buf[2];
        return 2;
      }
  
      /* Code set 3 (CNS 11643-1992 Plane 3) */
      if (buf[0] == 3) {
        if (n < 4)
          return RET_TOOSMALL;
        r[0] = 0xc2;
        r[1] = 0xcb;
        r[2] = buf[1]+0x80;
        r[3] = buf[2]+0x80;
        return 4;
      }
    }
  
    return RET_ILUNI;
  }
  