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 * ISO-2022-JP-1 23 */ 24 25/* Specification: RFC 2237 */ 26 27#define ESC 0x1b 28 29/* 30 * The state can be one of the following values. 31 */ 32#define STATE_ASCII 0 33#define STATE_JISX0201ROMAN 1 34#define STATE_JISX0208 2 35#define STATE_JISX0212 3 36 37static int 38iso2022_jp1_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n) 39{ 40 state_t state = conv->istate; 41 int count = 0; 42 unsigned char c; 43 for (;;) { 44 c = *s; 45 if (c == ESC) { 46 if (n < count+3) 47 goto none; 48 if (s[1] == '(') { 49 if (s[2] == 'B') { 50 state = STATE_ASCII; 51 s += 3; count += 3; 52 if (n < count+1) 53 goto none; 54 continue; 55 } 56 if (s[2] == 'J') { 57 state = STATE_JISX0201ROMAN; 58 s += 3; count += 3; 59 if (n < count+1) 60 goto none; 61 continue; 62 } 63 return RET_ILSEQ; 64 } 65 if (s[1] == '$') { 66 if (s[2] == '@' || s[2] == 'B') { 67 /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */ 68 state = STATE_JISX0208; 69 s += 3; count += 3; 70 if (n < count+1) 71 goto none; 72 continue; 73 } 74 if (s[2] == '(') { 75 if (n < count+4) 76 goto none; 77 if (s[3] == 'D') { 78 state = STATE_JISX0212; 79 s += 4; count += 4; 80 if (n < count+1) 81 goto none; 82 continue; 83 } 84 } 85 return RET_ILSEQ; 86 } 87 return RET_ILSEQ; 88 } 89 break; 90 } 91 switch (state) { 92 case STATE_ASCII: 93 if (c < 0x80) { 94 int ret = ascii_mbtowc(conv,pwc,s,1); 95 if (ret == RET_ILSEQ) 96 return RET_ILSEQ; 97 if (ret != 1) abort(); 98 conv->istate = state; 99 return count+1; 100 } else 101 return RET_ILSEQ; 102 case STATE_JISX0201ROMAN: 103 if (c < 0x80) { 104 int ret = jisx0201_mbtowc(conv,pwc,s,1); 105 if (ret == RET_ILSEQ) 106 return RET_ILSEQ; 107 if (ret != 1) abort(); 108 conv->istate = state; 109 return count+1; 110 } else 111 return RET_ILSEQ; 112 case STATE_JISX0208: 113 if (n < count+2) 114 goto none; 115 if (s[0] < 0x80 && s[1] < 0x80) { 116 int ret = jisx0208_mbtowc(conv,pwc,s,2); 117 if (ret == RET_ILSEQ) 118 return RET_ILSEQ; 119 if (ret != 2) abort(); 120 conv->istate = state; 121 return count+2; 122 } else 123 return RET_ILSEQ; 124 case STATE_JISX0212: 125 if (n < count+2) 126 goto none; 127 if (s[0] < 0x80 && s[1] < 0x80) { 128 int ret = jisx0212_mbtowc(conv,pwc,s,2); 129 if (ret == RET_ILSEQ) 130 return RET_ILSEQ; 131 if (ret != 2) abort(); 132 conv->istate = state; 133 return count+2; 134 } else 135 return RET_ILSEQ; 136 default: abort(); 137 } 138 139none: 140 conv->istate = state; 141 return RET_TOOFEW(count); 142} 143 144static int 145iso2022_jp1_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) 146{ 147 state_t state = conv->ostate; 148 unsigned char buf[2]; 149 int ret; 150 151 /* Try ASCII. */ 152 ret = ascii_wctomb(conv,buf,wc,1); 153 if (ret != RET_ILUNI) { 154 if (ret != 1) abort(); 155 if (buf[0] < 0x80) { 156 int count = (state == STATE_ASCII ? 1 : 4); 157 if (n < count) 158 return RET_TOOSMALL; 159 if (state != STATE_ASCII) { 160 r[0] = ESC; 161 r[1] = '('; 162 r[2] = 'B'; 163 r += 3; 164 state = STATE_ASCII; 165 } 166 r[0] = buf[0]; 167 conv->ostate = state; 168 return count; 169 } 170 } 171 172 /* Try JIS X 0201-1976 Roman. */ 173 ret = jisx0201_wctomb(conv,buf,wc,1); 174 if (ret != RET_ILUNI) { 175 if (ret != 1) abort(); 176 if (buf[0] < 0x80) { 177 int count = (state == STATE_JISX0201ROMAN ? 1 : 4); 178 if (n < count) 179 return RET_TOOSMALL; 180 if (state != STATE_JISX0201ROMAN) { 181 r[0] = ESC; 182 r[1] = '('; 183 r[2] = 'J'; 184 r += 3; 185 state = STATE_JISX0201ROMAN; 186 } 187 r[0] = buf[0]; 188 conv->ostate = state; 189 return count; 190 } 191 } 192 193 /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */ 194 ret = jisx0208_wctomb(conv,buf,wc,2); 195 if (ret != RET_ILUNI) { 196 if (ret != 2) abort(); 197 if (buf[0] < 0x80 && buf[1] < 0x80) { 198 int count = (state == STATE_JISX0208 ? 2 : 5); 199 if (n < count) 200 return RET_TOOSMALL; 201 if (state != STATE_JISX0208) { 202 r[0] = ESC; 203 r[1] = '$'; 204 r[2] = 'B'; 205 r += 3; 206 state = STATE_JISX0208; 207 } 208 r[0] = buf[0]; 209 r[1] = buf[1]; 210 conv->ostate = state; 211 return count; 212 } 213 } 214 215 /* Try JIS X 0212-1990. */ 216 ret = jisx0212_wctomb(conv,buf,wc,2); 217 if (ret != RET_ILUNI) { 218 if (ret != 2) abort(); 219 if (buf[0] < 0x80 && buf[1] < 0x80) { 220 int count = (state == STATE_JISX0212 ? 2 : 6); 221 if (n < count) 222 return RET_TOOSMALL; 223 if (state != STATE_JISX0212) { 224 r[0] = ESC; 225 r[1] = '$'; 226 r[2] = '('; 227 r[3] = 'D'; 228 r += 4; 229 state = STATE_JISX0212; 230 } 231 r[0] = buf[0]; 232 r[1] = buf[1]; 233 conv->ostate = state; 234 return count; 235 } 236 } 237 238 return RET_ILUNI; 239} 240 241static int 242iso2022_jp1_reset (conv_t conv, unsigned char *r, int n) 243{ 244 state_t state = conv->ostate; 245 if (state != STATE_ASCII) { 246 if (n < 3) 247 return RET_TOOSMALL; 248 r[0] = ESC; 249 r[1] = '('; 250 r[2] = 'B'; 251 /* conv->ostate = 0; will be done by the caller */ 252 return 3; 253 } else 254 return 0; 255} 256 257#undef STATE_JISX0212 258#undef STATE_JISX0208 259#undef STATE_JISX0201ROMAN 260#undef STATE_ASCII 261