1/*- 2 * Copyright (c) 2002-2004 Tim J. Robbins 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26/* 27 * PRC National Standard GB 18030-2000 encoding of Chinese text. 28 * 29 * See gb18030(5) for details. 30 */ 31 32#include <sys/param.h> 33__FBSDID("$FreeBSD: src/lib/libc/locale/gb18030.c,v 1.8 2007/10/13 16:28:21 ache Exp $"); 34 35#include "xlocale_private.h" 36 37#include <errno.h> 38#include <runetype.h> 39#include <stdlib.h> 40#include <string.h> 41#include <wchar.h> 42#include "mblocal.h" 43 44#define GB18030_MB_CUR_MAX 4 45 46static size_t _GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict, 47 size_t, mbstate_t * __restrict, locale_t); 48static int _GB18030_mbsinit(const mbstate_t *, locale_t); 49static size_t _GB18030_wcrtomb(char * __restrict, wchar_t, 50 mbstate_t * __restrict, locale_t); 51 52typedef struct { 53 int count; 54 u_char bytes[4]; 55} _GB18030State; 56 57int 58_GB18030_init(struct __xlocale_st_runelocale *xrl) 59{ 60 61 xrl->__mbrtowc = _GB18030_mbrtowc; 62 xrl->__wcrtomb = _GB18030_wcrtomb; 63 xrl->__mbsinit = _GB18030_mbsinit; 64 xrl->__mb_cur_max = GB18030_MB_CUR_MAX; 65 xrl->__mb_sb_limit = 128; 66 67 return (0); 68} 69 70static int 71_GB18030_mbsinit(const mbstate_t *ps, locale_t loc __unused) 72{ 73 74 return (ps == NULL || ((const _GB18030State *)ps)->count == 0); 75} 76 77static size_t 78_GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, 79 size_t n, mbstate_t * __restrict ps, locale_t loc __unused) 80{ 81 _GB18030State *gs; 82 wchar_t wch; 83 int ch, len, ocount; 84 size_t ncopy; 85 86 gs = (_GB18030State *)ps; 87 88 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 89 errno = EINVAL; 90 return ((size_t)-1); 91 } 92 93 if (s == NULL) { 94 s = ""; 95 n = 1; 96 pwc = NULL; 97 } 98 99 ncopy = MIN(MIN(n, GB18030_MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 100 memcpy(gs->bytes + gs->count, s, ncopy); 101 ocount = gs->count; 102 gs->count += ncopy; 103 s = (char *)gs->bytes; 104 n = gs->count; 105 106 if (n == 0) 107 /* Incomplete multibyte sequence */ 108 return ((size_t)-2); 109 110 /* 111 * Single byte: [00-7f] 112 * Two byte: [81-fe][40-7e,80-fe] 113 * Four byte: [81-fe][30-39][81-fe][30-39] 114 */ 115 ch = (unsigned char)*s++; 116 if (ch <= 0x7f) { 117 len = 1; 118 wch = ch; 119 } else if (ch >= 0x81 && ch <= 0xfe) { 120 wch = ch; 121 if (n < 2) 122 return ((size_t)-2); 123 ch = (unsigned char)*s++; 124 if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) { 125 wch = (wch << 8) | ch; 126 len = 2; 127 } else if (ch >= 0x30 && ch <= 0x39) { 128 /* 129 * Strip high bit off the wide character we will 130 * eventually output so that it is positive when 131 * cast to wint_t on 32-bit twos-complement machines. 132 */ 133 wch = ((wch & 0x7f) << 8) | ch; 134 if (n < 3) 135 return ((size_t)-2); 136 ch = (unsigned char)*s++; 137 if (ch < 0x81 || ch > 0xfe) 138 goto ilseq; 139 wch = (wch << 8) | ch; 140 if (n < 4) 141 return ((size_t)-2); 142 ch = (unsigned char)*s++; 143 if (ch < 0x30 || ch > 0x39) 144 goto ilseq; 145 wch = (wch << 8) | ch; 146 len = 4; 147 } else 148 goto ilseq; 149 } else 150 goto ilseq; 151 152 if (pwc != NULL) 153 *pwc = wch; 154 gs->count = 0; 155 return (wch == L'\0' ? 0 : len - ocount); 156ilseq: 157 errno = EILSEQ; 158 return ((size_t)-1); 159} 160 161static size_t 162_GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused) 163{ 164 _GB18030State *gs; 165 size_t len; 166 int c; 167 168 gs = (_GB18030State *)ps; 169 170 if (gs->count != 0) { 171 errno = EINVAL; 172 return ((size_t)-1); 173 } 174 175 if (s == NULL) 176 /* Reset to initial shift state (no-op) */ 177 return (1); 178 if ((wc & ~0x7fffffff) != 0) 179 goto ilseq; 180 if (wc & 0x7f000000) { 181 /* Replace high bit that mbrtowc() removed. */ 182 wc |= 0x80000000; 183 c = (wc >> 24) & 0xff; 184 if (c < 0x81 || c > 0xfe) 185 goto ilseq; 186 *s++ = c; 187 c = (wc >> 16) & 0xff; 188 if (c < 0x30 || c > 0x39) 189 goto ilseq; 190 *s++ = c; 191 c = (wc >> 8) & 0xff; 192 if (c < 0x81 || c > 0xfe) 193 goto ilseq; 194 *s++ = c; 195 c = wc & 0xff; 196 if (c < 0x30 || c > 0x39) 197 goto ilseq; 198 *s++ = c; 199 len = 4; 200 } else if (wc & 0x00ff0000) 201 goto ilseq; 202 else if (wc & 0x0000ff00) { 203 c = (wc >> 8) & 0xff; 204 if (c < 0x81 || c > 0xfe) 205 goto ilseq; 206 *s++ = c; 207 c = wc & 0xff; 208 if (c < 0x40 || c == 0x7f || c == 0xff) 209 goto ilseq; 210 *s++ = c; 211 len = 2; 212 } else if (wc <= 0x7f) { 213 *s++ = wc; 214 len = 1; 215 } else 216 goto ilseq; 217 218 return (len); 219ilseq: 220 errno = EILSEQ; 221 return ((size_t)-1); 222} 223