lib/ces_gbk.h

   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., 59 Temple Place -
  18  * Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * GBK, CP936
  23  */
  24
  25 static int
  26 ces_gbk_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  27 {
  28   unsigned char c = *s;
  29
  30   /* Code set 0 (ASCII or GB 1988-89) */
  31   if (c < 0x80)
  32     return ascii_mbtowc(conv,pwc,s,n);
  33   /* Code set 1 (GBK) */
  34   if (c >= 0x81 && c < 0xff) {
  35     if (n < 2)
  36       return RET_TOOFEW(0);
  37     return gbk_mbtowc(conv,pwc,s,2);
  38   }
  39   return RET_ILSEQ;
  40 }
  41
  42 static int
  43 ces_gbk_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  44 {
  45   unsigned char buf[2];
  46   int ret;
  47
  48   /* Code set 0 (ASCII or GB 1988-89) */
  49   ret = ascii_wctomb(conv,r,wc,n);
  50   if (ret != RET_ILUNI)
  51     return ret;
  52
  53   /* Code set 1 (GBK) */
  54   ret = gbk_wctomb(conv,buf,wc,2);
  55   if (ret != RET_ILUNI) {
  56     if (ret != 2) abort();
  57     if (n < 2)
  58       return RET_TOOSMALL;
  59     r[0] = buf[0];
  60     r[1] = buf[1];
  61     return 2;
  62   }
  63
  64   return RET_ILUNI;
  65 }