gbk.c revision 129166
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 129166 2004-05-13 03:08:28Z tjr $"); 40 41#include <errno.h> 42#include <runetype.h> 43#include <stdlib.h> 44#include <string.h> 45#include <wchar.h> 46#include "mblocal.h" 47 48int _GBK_init(_RuneLocale *); 49size_t _GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t, 50 mbstate_t * __restrict); 51int _GBK_mbsinit(const mbstate_t *); 52size_t _GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict); 53 54typedef struct { 55 int count; 56 u_char bytes[2]; 57} _GBKState; 58 59int 60_GBK_init(_RuneLocale *rl) 61{ 62 63 __mbrtowc = _GBK_mbrtowc; 64 __wcrtomb = _GBK_wcrtomb; 65 __mbsinit = _GBK_mbsinit; 66 _CurrentRuneLocale = rl; 67 __mb_cur_max = 2; 68 return (0); 69} 70 71int 72_GBK_mbsinit(const mbstate_t *ps) 73{ 74 75 return (ps == NULL || ((const _GBKState *)ps)->count == 0); 76} 77 78static __inline int 79_gbk_check(u_int c) 80{ 81 82 c &= 0xff; 83 return ((c >= 0x81 && c <= 0xfe) ? 2 : 1); 84} 85 86size_t 87_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 88 mbstate_t * __restrict ps) 89{ 90 _GBKState *gs; 91 wchar_t wc; 92 int i, len, ocount; 93 size_t ncopy; 94 95 gs = (_GBKState *)ps; 96 97 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 98 errno = EINVAL; 99 return ((size_t)-1); 100 } 101 102 if (s == NULL) { 103 s = ""; 104 n = 1; 105 pwc = NULL; 106 } 107 108 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 109 memcpy(gs->bytes + gs->count, s, ncopy); 110 ocount = gs->count; 111 gs->count += ncopy; 112 s = (char *)gs->bytes; 113 n = gs->count; 114 115 if (n == 0 || (size_t)(len = _gbk_check(*s)) > n) 116 /* Incomplete multibyte sequence */ 117 return ((size_t)-2); 118 if (len == 2 && s[1] == '\0') { 119 errno = EILSEQ; 120 return ((size_t)-1); 121 } 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