2 * Copyright (C) 2005, 2016 Free Software Foundation, Inc.
3 * This file is part of the GNU LIBICONV Library.
5 * The GNU LIBICONV Library is free software; you can redistribute it
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7 * License as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
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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.
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, see <http://www.gnu.org/licenses/>.
25 * The IANA has CP936 as an alias of GBK. But GBK is an official Chinese
26 * specification, whereas CP936 is de-facto maintained by Microsoft. And,
27 * of course, Microsoft modified CP936 since 1999.
29 * The differences from GBK are:
31 * 1. A single character:
34 * 0x80 0x20AC # EURO SIGN
36 * Some variants of CP936 (in JDK, Windows-2000, ICU) also add:
38 * 2. Private area mappings:
41 * 0x{A1..A2}{40..7E,80..A0} U+E4C6..U+E585
42 * 0x{AA..AF,F8..FE}{A1..FE} U+E000..U+E4C5
44 * We add them too because, although there are backward compatibility problems
45 * when a character from a private area is moved to an official Unicode code
46 * point, they are useful for some people in practice.
50 cp936_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
54 int ret = ces_gbk_mbtowc(conv,pwc,s,n);
58 /* Then handle the additional mappings. */
65 /* User-defined characters */
66 if (c >= 0xa1 && c <= 0xa2) {
70 unsigned char c2 = s[1];
71 if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xa1)) {
72 *pwc = 0xe4c6 + 96 * (c - 0xa1) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
76 } else if ((c >= 0xaa && c < 0xb0) || (c >= 0xf8 && c < 0xff)) {
80 unsigned char c2 = s[1];
81 if (c2 >= 0xa1 && c2 < 0xff) {
82 *pwc = 0xe000 + 94 * (c - (c >= 0xf8 ? 0xf2 : 0xaa)) + (c2 - 0xa1);
92 cp936_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
96 int ret = ces_gbk_wctomb(conv,r,wc,n);
100 /* Then handle the additional mappings. */
101 if (wc >= 0xe000 && wc < 0xe586) {
102 /* User-defined characters */
104 return RET_TOOFEW(0);
106 unsigned int i = wc - 0xe000;
107 unsigned int c1 = i / 94;
108 unsigned int c2 = i % 94;
109 r[0] = c1 + (c1 < 6 ? 0xaa : 0xf2);
113 unsigned int i = wc - 0xe4c6;
114 unsigned int c1 = i / 96;
115 unsigned int c2 = i % 96;
117 r[1] = c2 + (c2 < 0x3f ? 0x40 : 0x41);
120 } else if (wc == 0x20ac) {