lib/gb12345.h

   1 /*
   2  * Copyright (C) 1999-2000 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., 59 Temple Place -
  18  * Suite 330, Boston, MA 02111-1307, 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_ILSEQ)
  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_ILSEQ;
  65   else
  66     return ret;
  67 }