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 * EUC-TW
23 */
24
25 static int
euc_tw_mbtowc(conv_t conv,ucs4_t * pwc,const unsigned char * s,int n)26 euc_tw_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 if (c >= 0xa1 && c < 0xff) {
34 if (n < 2)
35 return RET_TOOFEW(0);
36 {
37 unsigned char c2 = s[1];
38 if (c2 >= 0xa1 && c2 < 0xff) {
39 unsigned char buf[2];
40 buf[0] = c-0x80; buf[1] = c2-0x80;
41 return cns11643_1_mbtowc(conv,pwc,buf,2);
42 } else
43 return RET_ILSEQ;
44 }
45 }
46 /* Code set 2 (CNS 11643-1992 Planes 1-16) */
47 if (c == 0x8e) {
48 if (n < 4)
49 return RET_TOOFEW(0);
50 {
51 unsigned char c2 = s[1];
52 if (c2 >= 0xa1 && c2 <= 0xb0) {
53 unsigned char c3 = s[2];
54 unsigned char c4 = s[3];
55 if (c3 >= 0xa1 && c3 < 0xff && c4 >= 0xa1 && c4 < 0xff) {
56 unsigned char buf[2];
57 int ret;
58 buf[0] = c3-0x80; buf[1] = c4-0x80;
59 switch (c2-0xa0) {
60 case 1: ret = cns11643_1_mbtowc(conv,pwc,buf,2); break;
61 case 2: ret = cns11643_2_mbtowc(conv,pwc,buf,2); break;
62 case 3: ret = cns11643_3_mbtowc(conv,pwc,buf,2); break;
63 case 4: ret = cns11643_4_mbtowc(conv,pwc,buf,2); break;
64 case 5: ret = cns11643_5_mbtowc(conv,pwc,buf,2); break;
65 case 6: ret = cns11643_6_mbtowc(conv,pwc,buf,2); break;
66 case 7: ret = cns11643_7_mbtowc(conv,pwc,buf,2); break;
67 case 15: ret = cns11643_15_mbtowc(conv,pwc,buf,2); break;
68 default: return RET_ILSEQ;
69 }
70 if (ret == RET_ILSEQ)
71 return RET_ILSEQ;
72 if (ret != 2) abort();
73 return 4;
74 }
75 }
76 }
77 }
78 return RET_ILSEQ;
79 }
80
81 static int
euc_tw_wctomb(conv_t conv,unsigned char * r,ucs4_t wc,int n)82 euc_tw_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
83 {
84 unsigned char buf[3];
85 int ret;
86
87 /* Code set 0 (ASCII) */
88 ret = ascii_wctomb(conv,r,wc,n);
89 if (ret != RET_ILUNI)
90 return ret;
91
92 ret = cns11643_wctomb(conv,buf,wc,3);
93 if (ret != RET_ILUNI) {
94 if (ret != 3) abort();
95
96 /* Code set 1 (CNS 11643-1992 Plane 1) */
97 if (buf[0] == 1) {
98 if (n < 2)
99 return RET_TOOSMALL;
100 r[0] = buf[1]+0x80;
101 r[1] = buf[2]+0x80;
102 return 2;
103 }
104
105 /* Code set 2 (CNS 11643-1992 Planes 1-16) */
106 if (n < 4)
107 return RET_TOOSMALL;
108 r[0] = 0x8e;
109 r[1] = buf[0]+0xa0;
110 r[2] = buf[1]+0x80;
111 r[3] = buf[2]+0x80;
112 return 4;
113 }
114
115 return RET_ILUNI;
116 }
117