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libiconv

    1: /*
    2:  * Copyright (C) 1999-2001, 2005 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:  * GBK
   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: }