lib/dec_hanyu.h

   1 /*
   2  * Copyright (C) 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  * DEC-HANYU
  23  */
  24
  25 static int
  26 dec_hanyu_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  27 {
  28   unsigned char c = *s;
  29   /* Code set 0 (ASCII) */
  30   if (c < 0x80)
  31     return ascii_mbtowc(conv,pwc,s,n);
  32   /* Code set 1 (CNS 11643-1992 Plane 1),
  33      Code set 2 (CNS 11643-1992 Plane 2),
  34      Code set 3 (CNS 11643-1992 Plane 3) */
  35   if (c >= 0xa1 && c < 0xff) {
  36     if (n < 2)
  37       return RET_TOOFEW(0);
  38     {
  39       unsigned char c2 = s[1];
  40       if (c == 0xc2 && c2 == 0xcb) {
  41         if (n < 4)
  42           return RET_TOOFEW(0);
  43         if (s[2] >= 0xa1 && s[2] < 0xff && s[3] >= 0xa1 && s[3] < 0xff) {
  44           unsigned char buf[2];
  45           int ret;
  46           buf[0] = s[2]-0x80; buf[1] = s[3]-0x80;
  47           ret = cns11643_3_mbtowc(conv,pwc,buf,2);
  48           if (ret != RET_ILSEQ) {
  49             if (ret != 2) abort();
  50             return 4;
  51           }
  52         }
  53       } else if (c2 >= 0xa1 && c2 < 0xff) {
  54         unsigned char buf[2];
  55         buf[0] = c-0x80; buf[1] = c2-0x80;
  56         return cns11643_1_mbtowc(conv,pwc,buf,2);
  57       } else if (c2 >= 0x21 && c2 < 0x7f) {
  58         unsigned char buf[2];
  59         buf[0] = c-0x80; buf[1] = c2;
  60         return cns11643_2_mbtowc(conv,pwc,buf,2);
  61       }
  62     }
  63   }
  64   return RET_ILSEQ;
  65 }
  66
  67 static int
  68 dec_hanyu_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  69 {
  70   unsigned char buf[3];
  71   int ret;
  72
  73   /* Code set 0 (ASCII) */
  74   ret = ascii_wctomb(conv,r,wc,n);
  75   if (ret != RET_ILUNI)
  76     return ret;
  77
  78   ret = cns11643_wctomb(conv,buf,wc,3);
  79   if (ret != RET_ILUNI) {
  80     if (ret != 3) abort();
  81
  82     /* Code set 1 (CNS 11643-1992 Plane 1) */
  83     if (buf[0] == 1) {
  84       if (n < 2)
  85         return RET_TOOSMALL;
  86       r[0] = buf[1]+0x80;
  87       r[1] = buf[2]+0x80;
  88       return 2;
  89     }
  90
  91     /* Code set 2 (CNS 11643-1992 Plane 2) */
  92     if (buf[0] == 2) {
  93       if (n < 2)
  94         return RET_TOOSMALL;
  95       r[0] = buf[1]+0x80;
  96       r[1] = buf[2];
  97       return 2;
  98     }
  99
 100     /* Code set 3 (CNS 11643-1992 Plane 3) */
 101     if (buf[0] == 3) {
 102       if (n < 4)
 103         return RET_TOOSMALL;
 104       r[0] = 0xc2;
 105       r[1] = 0xcb;
 106       r[2] = buf[1]+0x80;
 107       r[3] = buf[2]+0x80;
 108       return 4;
 109     }
 110   }
 111
 112   return RET_ILUNI;
 113 }