lib/cp949.h

   1 /*
   2  * Copyright (C) 1999-2001, 2005, 2007, 2016 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 Lesser General Public
   7  * License as published by the Free Software Foundation; either version 2.1
   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  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, see <https://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * CP949 is EUC-KR, extended with UHC (Unified Hangul Code).
  22  *
  23  * Some variants of CP949 (in JDK, Windows-2000, ICU) also add:
  24  *
  25  * 2. Private area mappings:
  26  *
  27  *        code           Unicode
  28  *    0xC9{A1..FE}   U+E000..U+E05D
  29  *    0xFE{A1..FE}   U+E05E..U+E0BB
  30  *
  31  * We add them too because, although there are backward compatibility problems
  32  * when a character from a private area is moved to an official Unicode code
  33  * point, they are useful for some people in practice.
  34  */
  35
  36 #include "uhc_1.h"
  37 #include "uhc_2.h"
  38
  39 static int
  40 cp949_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  41 {
  42   unsigned char c = *s;
  43   /* Code set 0 (ASCII) */
  44   if (c < 0x80)
  45     return ascii_mbtowc(conv,pwc,s,n);
  46   /* UHC part 1 */
  47   if (c >= 0x81 && c <= 0xa0)
  48     return uhc_1_mbtowc(conv,pwc,s,n);
  49   if (c >= 0xa1 && c < 0xff) {
  50     if (n < 2)
  51       return RET_TOOFEW(0);
  52     {
  53       unsigned char c2 = s[1];
  54       if (c2 < 0xa1)
  55         /* UHC part 2 */
  56         return uhc_2_mbtowc(conv,pwc,s,n);
  57       else if (c2 < 0xff && !(c == 0xa2 && c2 == 0xe8)) {
  58         /* Code set 1 (KS C 5601-1992, now KS X 1001:1998) */
  59         unsigned char buf[2];
  60         int ret;
  61         buf[0] = c-0x80; buf[1] = c2-0x80;
  62         ret = ksc5601_mbtowc(conv,pwc,buf,2);
  63         if (ret != RET_ILSEQ)
  64           return ret;
  65         /* User-defined characters */
  66         if (c == 0xc9) {
  67           *pwc = 0xe000 + (c2 - 0xa1);
  68           return 2;
  69         }
  70         if (c == 0xfe) {
  71           *pwc = 0xe05e + (c2 - 0xa1);
  72           return 2;
  73         }
  74       }
  75     }
  76   }
  77   return RET_ILSEQ;
  78 }
  79
  80 static int
  81 cp949_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  82 {
  83   unsigned char buf[2];
  84   int ret;
  85
  86   /* Code set 0 (ASCII) */
  87   ret = ascii_wctomb(conv,r,wc,n);
  88   if (ret != RET_ILUNI)
  89     return ret;
  90
  91   /* Code set 1 (KS C 5601-1992, now KS X 1001:1998) */
  92   if (wc != 0x327e) {
  93     ret = ksc5601_wctomb(conv,buf,wc,2);
  94     if (ret != RET_ILUNI) {
  95       if (ret != 2) abort();
  96       if (n < 2)
  97         return RET_TOOSMALL;
  98       r[0] = buf[0]+0x80;
  99       r[1] = buf[1]+0x80;
 100       return 2;
 101     }
 102   }
 103
 104   /* UHC */
 105   if (wc >= 0xac00 && wc < 0xd7a4) {
 106     if (wc < 0xc8a5)
 107       return uhc_1_wctomb(conv,r,wc,n);
 108     else
 109       return uhc_2_wctomb(conv,r,wc,n);
 110   }
 111
 112   /* User-defined characters */
 113   if (wc >= 0xe000 && wc < 0xe0bc) {
 114     if (n < 2)
 115       return RET_TOOSMALL;
 116     if (wc < 0xe05e) {
 117       r[0] = 0xc9;
 118       r[1] = wc - 0xe000 + 0xa1;
 119     } else {
 120       r[0] = 0xfe;
 121       r[1] = wc - 0xe05e + 0xa1;
 122     }
 123     return 2;
 124   }
 125
 126   return RET_ILUNI;
 127 }