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    1: /*
    2:  * Copyright (C) 1999-2001 Free Software Foundation, Inc.
    3:  * This file is part of the GNU LIBICONV Library.
    4:  *
    5:  * The GNU LIBICONV Library is free software; you can redistribute it
    6:  * and/or modify it under the terms of the GNU Library General Public
    7:  * License as published by the Free Software Foundation; either version 2
    8:  * of the License, or (at your option) any later version.
    9:  *
   10:  * The GNU LIBICONV Library is distributed in the hope that it will be
   11:  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:  * Library General Public License for more details.
   14:  *
   15:  * You should have received a copy of the GNU Library General Public
   16:  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   17:  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
   18:  * Fifth Floor, Boston, MA 02110-1301, USA.
   19:  */
   20: 
   21: /*
   22:  * GB/T 12345-1990
   23:  */
   24: 
   25: /*
   26:  * GB/T 12345-1990 is a traditional chinese counterpart of GB 2312-1986.
   27:  * According to the unicode.org tables:
   28:  * 2146 characters have been changed to their traditional counterpart,
   29:  * 103 characters have been added, no characters have been removed.
   30:  * Therefore we use an auxiliary table, which contains only the changes.
   31:  */
   32: 
   33: #include "gb12345ext.h"
   34: 
   35: static int
   36: gb12345_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   37: {
   38:   int ret;
   39: 
   40:   /* The gb12345ext table overrides some entries in the gb2312 table. */
   41:   /* Try the GB12345 extensions -> Unicode table. */
   42:   ret = gb12345ext_mbtowc(conv,pwc,s,n);
   43:   if (ret != RET_ILSEQ)
   44:     return ret;
   45:   /* Try the GB2312 -> Unicode table. */
   46:   ret = gb2312_mbtowc(conv,pwc,s,n);
   47:   return ret;
   48: }
   49: 
   50: static int
   51: gb12345_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   52: {
   53:   int ret;
   54: 
   55:   /* The gb12345ext table overrides some entries in the gb2312 table. */
   56:   /* Try the Unicode -> GB12345 extensions table. */
   57:   ret = gb12345ext_wctomb(conv,r,wc,n);
   58:   if (ret != RET_ILUNI)
   59:     return ret;
   60:   /* Try the Unicode -> GB2312 table, and check that the resulting GB2312
   61:      byte sequence is not overridden by the GB12345 extensions table. */
   62:   ret = gb2312_wctomb(conv,r,wc,n);
   63:   if (ret == 2 && gb12345ext_mbtowc(conv,&wc,r,2) == 2)
   64:     return RET_ILUNI;
   65:   else
   66:     return ret;
   67: }