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1 office 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., 51 Franklin Street,
18 * Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20  
21 /*
22 * BIG-5
23 */
24  
25 static int
26 ces_big5_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 (BIG5) */
33 if (c >= 0xa1 && c < 0xff) {
34 if (n < 2)
35 return RET_TOOFEW(0);
36 {
37 unsigned char c2 = s[1];
38 if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff))
39 return big5_mbtowc(conv,pwc,s,2);
40 else
41 return RET_ILSEQ;
42 }
43 }
44 return RET_ILSEQ;
45 }
46  
47 static int
48 ces_big5_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
49 {
50 unsigned char buf[2];
51 int ret;
52  
53 /* Code set 0 (ASCII) */
54 ret = ascii_wctomb(conv,r,wc,n);
55 if (ret != RET_ILUNI)
56 return ret;
57  
58 /* Code set 1 (BIG5) */
59 ret = big5_wctomb(conv,buf,wc,2);
60 if (ret != RET_ILUNI) {
61 if (ret != 2) abort();
62 if (n < 2)
63 return RET_TOOSMALL;
64 r[0] = buf[0];
65 r[1] = buf[1];
66 return 2;
67 }
68  
69 return RET_ILUNI;
70 }