1 /*- 2 * Copyright (c) 2004 Tim J. Robbins. All rights reserved. 3 * Copyright (c) 2003 David Xu <davidxu@freebsd.org> 4 * All rights reserved. 5 * 6 * Copyright (c) 2011 The FreeBSD Foundation 7 * All rights reserved. 8 * Portions of this software were developed by David Chisnall 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <errno.h> 37 #include <runetype.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <wchar.h> 41 #include "mblocal.h" 42 43 static size_t _GB2312_mbrtowc(wchar_t * __restrict, const char * __restrict, 44 size_t, mbstate_t * __restrict); 45 static int _GB2312_mbsinit(const mbstate_t *); 46 static size_t _GB2312_wcrtomb(char * __restrict, wchar_t, 47 mbstate_t * __restrict); 48 49 typedef struct { 50 int count; 51 u_char bytes[2]; 52 } _GB2312State; 53 54 int 55 _GB2312_init(struct xlocale_ctype *l, _RuneLocale *rl) 56 { 57 58 l->runes = rl; 59 l->__mbrtowc = _GB2312_mbrtowc; 60 l->__wcrtomb = _GB2312_wcrtomb; 61 l->__mbsinit = _GB2312_mbsinit; 62 l->__mb_cur_max = 2; 63 l->__mb_sb_limit = 128; 64 return (0); 65 } 66 67 static int 68 _GB2312_mbsinit(const mbstate_t *ps) 69 { 70 71 return (ps == NULL || ((const _GB2312State *)ps)->count == 0); 72 } 73 74 static __inline int 75 _GB2312_check(const char *str, size_t n) 76 { 77 const u_char *s = (const u_char *)str; 78 79 if (n == 0) 80 /* Incomplete multibyte sequence */ 81 return (-2); 82 if (s[0] >= 0xa1 && s[0] <= 0xfe) { 83 if (n < 2) 84 /* Incomplete multibyte sequence */ 85 return (-2); 86 if (s[1] < 0xa1 || s[1] > 0xfe) 87 /* Invalid multibyte sequence */ 88 return (-1); 89 return (2); 90 } else if (s[0] & 0x80) { 91 /* Invalid multibyte sequence */ 92 return (-1); 93 } 94 return (1); 95 } 96 97 static size_t 98 _GB2312_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 99 mbstate_t * __restrict ps) 100 { 101 _GB2312State *gs; 102 wchar_t wc; 103 int i, len, ocount; 104 size_t ncopy; 105 106 gs = (_GB2312State *)ps; 107 108 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 109 errno = EINVAL; 110 return ((size_t)-1); 111 } 112 113 if (s == NULL) { 114 s = ""; 115 n = 1; 116 pwc = NULL; 117 } 118 119 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 120 memcpy(gs->bytes + gs->count, s, ncopy); 121 ocount = gs->count; 122 gs->count += ncopy; 123 s = (char *)gs->bytes; 124 n = gs->count; 125 126 if ((len = _GB2312_check(s, n)) < 0) 127 return ((size_t)len); 128 wc = 0; 129 i = len; 130 while (i-- > 0) 131 wc = (wc << 8) | (unsigned char)*s++; 132 if (pwc != NULL) 133 *pwc = wc; 134 gs->count = 0; 135 return (wc == L'\0' ? 0 : len - ocount); 136 } 137 138 static size_t 139 _GB2312_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 140 { 141 _GB2312State *gs; 142 143 gs = (_GB2312State *)ps; 144 145 if (gs->count != 0) { 146 errno = EINVAL; 147 return ((size_t)-1); 148 } 149 150 if (s == NULL) 151 /* Reset to initial shift state (no-op) */ 152 return (1); 153 if (wc & 0x8000) { 154 *s++ = (wc >> 8) & 0xff; 155 *s = wc & 0xff; 156 return (2); 157 } 158 *s = wc & 0xff; 159 return (1); 160 } 161