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