264 lines
6.3 KiB
C
264 lines
6.3 KiB
C
/*
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* Copyright (C) 1999-2001, 2008, 2016 Free Software Foundation, Inc.
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* This file is part of the GNU LIBICONV Library.
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*
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* The GNU LIBICONV Library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* The GNU LIBICONV Library is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* ISO-2022-JP-1
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*/
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/* Specification: RFC 2237 */
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#define ESC 0x1b
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/*
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* The state can be one of the following values.
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*/
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#define STATE_ASCII 0
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#define STATE_JISX0201ROMAN 1
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#define STATE_JISX0208 2
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#define STATE_JISX0212 3
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static int
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iso2022_jp1_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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state_t state = conv->istate;
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int count = 0;
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unsigned char c;
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for (;;) {
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c = *s;
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if (c == ESC) {
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if (n < count+3)
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goto none;
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if (s[1] == '(') {
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if (s[2] == 'B') {
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state = STATE_ASCII;
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s += 3; count += 3;
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if (n < count+1)
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goto none;
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continue;
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}
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if (s[2] == 'J') {
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state = STATE_JISX0201ROMAN;
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s += 3; count += 3;
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if (n < count+1)
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goto none;
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continue;
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}
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goto ilseq;
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}
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if (s[1] == '$') {
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if (s[2] == '@' || s[2] == 'B') {
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/* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
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state = STATE_JISX0208;
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s += 3; count += 3;
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if (n < count+1)
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goto none;
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continue;
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}
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if (s[2] == '(') {
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if (n < count+4)
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goto none;
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if (s[3] == 'D') {
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state = STATE_JISX0212;
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s += 4; count += 4;
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if (n < count+1)
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goto none;
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continue;
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}
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}
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goto ilseq;
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}
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goto ilseq;
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}
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break;
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}
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switch (state) {
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case STATE_ASCII:
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if (c < 0x80) {
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int ret = ascii_mbtowc(conv,pwc,s,1);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 1) abort();
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conv->istate = state;
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return count+1;
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} else
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goto ilseq;
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case STATE_JISX0201ROMAN:
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if (c < 0x80) {
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int ret = jisx0201_mbtowc(conv,pwc,s,1);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 1) abort();
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conv->istate = state;
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return count+1;
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} else
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goto ilseq;
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case STATE_JISX0208:
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if (n < count+2)
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goto none;
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if (s[0] < 0x80 && s[1] < 0x80) {
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int ret = jisx0208_mbtowc(conv,pwc,s,2);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 2) abort();
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conv->istate = state;
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return count+2;
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} else
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goto ilseq;
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case STATE_JISX0212:
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if (n < count+2)
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goto none;
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if (s[0] < 0x80 && s[1] < 0x80) {
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int ret = jisx0212_mbtowc(conv,pwc,s,2);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 2) abort();
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conv->istate = state;
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return count+2;
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} else
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goto ilseq;
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default: abort();
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}
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none:
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conv->istate = state;
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return RET_TOOFEW(count);
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ilseq:
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conv->istate = state;
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return RET_SHIFT_ILSEQ(count);
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}
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static int
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iso2022_jp1_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
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{
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state_t state = conv->ostate;
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unsigned char buf[2];
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int ret;
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/* Try ASCII. */
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ret = ascii_wctomb(conv,buf,wc,1);
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if (ret != RET_ILUNI) {
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if (ret != 1) abort();
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if (buf[0] < 0x80) {
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int count = (state == STATE_ASCII ? 1 : 4);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_ASCII) {
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r[0] = ESC;
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r[1] = '(';
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r[2] = 'B';
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r += 3;
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state = STATE_ASCII;
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}
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r[0] = buf[0];
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conv->ostate = state;
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return count;
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}
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}
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/* Try JIS X 0201-1976 Roman. */
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ret = jisx0201_wctomb(conv,buf,wc,1);
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if (ret != RET_ILUNI) {
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if (ret != 1) abort();
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if (buf[0] < 0x80) {
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int count = (state == STATE_JISX0201ROMAN ? 1 : 4);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_JISX0201ROMAN) {
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r[0] = ESC;
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r[1] = '(';
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r[2] = 'J';
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r += 3;
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state = STATE_JISX0201ROMAN;
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}
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r[0] = buf[0];
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conv->ostate = state;
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return count;
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}
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}
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/* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
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ret = jisx0208_wctomb(conv,buf,wc,2);
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if (buf[0] < 0x80 && buf[1] < 0x80) {
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int count = (state == STATE_JISX0208 ? 2 : 5);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_JISX0208) {
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r[0] = ESC;
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r[1] = '$';
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r[2] = 'B';
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r += 3;
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state = STATE_JISX0208;
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}
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = state;
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return count;
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}
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}
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/* Try JIS X 0212-1990. */
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ret = jisx0212_wctomb(conv,buf,wc,2);
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if (buf[0] < 0x80 && buf[1] < 0x80) {
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int count = (state == STATE_JISX0212 ? 2 : 6);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_JISX0212) {
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r[0] = ESC;
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r[1] = '$';
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r[2] = '(';
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r[3] = 'D';
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r += 4;
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state = STATE_JISX0212;
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}
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = state;
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return count;
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}
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}
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return RET_ILUNI;
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}
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static int
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iso2022_jp1_reset (conv_t conv, unsigned char *r, size_t n)
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{
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state_t state = conv->ostate;
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if (state != STATE_ASCII) {
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if (n < 3)
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return RET_TOOSMALL;
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r[0] = ESC;
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r[1] = '(';
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r[2] = 'B';
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/* conv->ostate = 0; will be done by the caller */
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return 3;
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} else
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return 0;
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}
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#undef STATE_JISX0212
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#undef STATE_JISX0208
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#undef STATE_JISX0201ROMAN
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#undef STATE_ASCII
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