gbk.c revision 128155
1/*- 2 * Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved. 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Paul Borman at Krystal Technologies. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38#include <sys/param.h> 39__FBSDID("$FreeBSD: head/lib/libc/locale/gbk.c 128155 2004-04-12 13:09:18Z tjr $"); 40 41#include <errno.h> 42#include <runetype.h> 43#include <stdlib.h> 44#include <string.h> 45#include <wchar.h> 46 47extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict, 48 size_t, mbstate_t * __restrict); 49extern int (*__mbsinit)(const mbstate_t *); 50extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict); 51 52int _GBK_init(_RuneLocale *); 53size_t _GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t, 54 mbstate_t * __restrict); 55int _GBK_mbsinit(const mbstate_t *); 56size_t _GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict); 57 58typedef struct { 59 int count; 60 u_char bytes[2]; 61} _GBKState; 62 63int 64_GBK_init(_RuneLocale *rl) 65{ 66 67 __mbrtowc = _GBK_mbrtowc; 68 __wcrtomb = _GBK_wcrtomb; 69 __mbsinit = _GBK_mbsinit; 70 _CurrentRuneLocale = rl; 71 __mb_cur_max = 2; 72 return (0); 73} 74 75int 76_GBK_mbsinit(const mbstate_t *ps) 77{ 78 79 return (ps == NULL || ((const _GBKState *)ps)->count == 0); 80} 81 82static __inline int 83_gbk_check(u_int c) 84{ 85 86 c &= 0xff; 87 return ((c >= 0x81 && c <= 0xfe) ? 2 : 1); 88} 89 90size_t 91_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 92 mbstate_t * __restrict ps) 93{ 94 _GBKState *gs; 95 wchar_t wc; 96 int i, len, ocount; 97 size_t ncopy; 98 99 gs = (_GBKState *)ps; 100 101 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 102 errno = EINVAL; 103 return ((size_t)-1); 104 } 105 106 if (s == NULL) { 107 s = ""; 108 n = 1; 109 pwc = NULL; 110 } 111 112 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 113 memcpy(gs->bytes + gs->count, s, ncopy); 114 ocount = gs->count; 115 gs->count += ncopy; 116 s = (char *)gs->bytes; 117 n = gs->count; 118 119 if (n == 0 || (size_t)(len = _gbk_check(*s)) > n) 120 /* Incomplete multibyte sequence */ 121 return ((size_t)-2); 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 132size_t 133_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 134{ 135 _GBKState *gs; 136 137 gs = (_GBKState *)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