2 * Copyright (C) 1999-2001, 2008, 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
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.
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.
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/>.
24 /* Specification: RFC 1557 */
26 /* Note: CJK.INF says the SO designator needs to appear only once at the
27 beginning of a text, but to decrease the risk of ambiguities, when
28 producing ISO-2022-KR, we repeat the designator in every line containing
29 SO characters. RFC 1557 does not mandate this. */
36 * The state is composed of one of the following values
39 #define STATE_TWOBYTE 1
41 * and one of the following values, << 8
44 #define STATE2_DESIGNATED_KSC5601 1
47 unsigned int state1 = state & 0xff, state2 = state >> 8
48 #define COMBINE_STATE \
49 state = (state2 << 8) | state1
52 iso2022_kr_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
54 state_t state = conv->istate;
66 state2 = STATE2_DESIGNATED_KSC5601;
77 if (state2 != STATE2_DESIGNATED_KSC5601)
79 state1 = STATE_TWOBYTE;
97 int ret = ascii_mbtowc(conv,pwc,s,1);
100 if (ret != 1) abort();
101 #if 0 /* Accept ISO-2022-KR according to CJK.INF. */
102 if (*pwc == 0x000a || *pwc == 0x000d)
103 state2 = STATE2_NONE;
106 conv->istate = state;
113 if (state2 != STATE2_DESIGNATED_KSC5601) abort();
114 if (s[0] < 0x80 && s[1] < 0x80) {
115 int ret = ksc5601_mbtowc(conv,pwc,s,2);
116 if (ret == RET_ILSEQ)
118 if (ret != 2) abort();
120 conv->istate = state;
129 conv->istate = state;
130 return RET_TOOFEW(count);
134 conv->istate = state;
135 return RET_SHIFT_ILSEQ(count);
139 iso2022_kr_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
141 state_t state = conv->ostate;
143 unsigned char buf[2];
147 ret = ascii_wctomb(conv,buf,wc,1);
148 if (ret != RET_ILUNI) {
149 if (ret != 1) abort();
151 int count = (state1 == STATE_ASCII ? 1 : 2);
154 if (state1 != STATE_ASCII) {
157 state1 = STATE_ASCII;
160 if (wc == 0x000a || wc == 0x000d)
161 state2 = STATE2_NONE;
163 conv->ostate = state;
168 /* Try KS C 5601-1992. */
169 ret = ksc5601_wctomb(conv,buf,wc,2);
170 if (ret != RET_ILUNI) {
171 if (ret != 2) abort();
172 if (buf[0] < 0x80 && buf[1] < 0x80) {
173 int count = (state2 == STATE2_DESIGNATED_KSC5601 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
176 if (state2 != STATE2_DESIGNATED_KSC5601) {
182 state2 = STATE2_DESIGNATED_KSC5601;
184 if (state1 != STATE_TWOBYTE) {
187 state1 = STATE_TWOBYTE;
192 conv->ostate = state;
201 iso2022_kr_reset (conv_t conv, unsigned char *r, size_t n)
203 state_t state = conv->ostate;
206 if (state1 != STATE_ASCII) {
210 /* conv->ostate = 0; will be done by the caller */
218 #undef STATE2_DESIGNATED_KSC5601