gbk.c revision 172619
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 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/lib/libc/locale/gbk.c 172619 2007-10-13 16:28:22Z ache $"); 36 37#include <sys/types.h> 38#include <errno.h> 39#include <runetype.h> 40#include <stdlib.h> 41#include <string.h> 42#include <wchar.h> 43#include "mblocal.h" 44 45extern int __mb_sb_limit; 46 47static size_t _GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, 48 size_t, mbstate_t * __restrict); 49static int _GBK_mbsinit(const mbstate_t *); 50static size_t _GBK_wcrtomb(char * __restrict, wchar_t, 51 mbstate_t * __restrict); 52 53typedef struct { 54 wchar_t ch; 55} _GBKState; 56 57int 58_GBK_init(_RuneLocale *rl) 59{ 60 61 __mbrtowc = _GBK_mbrtowc; 62 __wcrtomb = _GBK_wcrtomb; 63 __mbsinit = _GBK_mbsinit; 64 _CurrentRuneLocale = rl; 65 __mb_cur_max = 2; 66 __mb_sb_limit = 128; 67 return (0); 68} 69 70static int 71_GBK_mbsinit(const mbstate_t *ps) 72{ 73 74 return (ps == NULL || ((const _GBKState *)ps)->ch == 0); 75} 76 77static __inline int 78_gbk_check(u_int c) 79{ 80 81 c &= 0xff; 82 return ((c >= 0x81 && c <= 0xfe) ? 2 : 1); 83} 84 85static size_t 86_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 87 mbstate_t * __restrict ps) 88{ 89 _GBKState *gs; 90 wchar_t wc; 91 size_t len; 92 93 gs = (_GBKState *)ps; 94 95 if ((gs->ch & ~0xFF) != 0) { 96 /* Bad conversion state. */ 97 errno = EINVAL; 98 return ((size_t)-1); 99 } 100 101 if (s == NULL) { 102 s = ""; 103 n = 1; 104 pwc = NULL; 105 } 106 107 if (n == 0) 108 /* Incomplete multibyte sequence */ 109 return ((size_t)-2); 110 111 if (gs->ch != 0) { 112 if (*s == '\0') { 113 errno = EILSEQ; 114 return ((size_t)-1); 115 } 116 wc = (gs->ch << 8) | (*s & 0xFF); 117 if (pwc != NULL) 118 *pwc = wc; 119 gs->ch = 0; 120 return (1); 121 } 122 123 len = (size_t)_gbk_check(*s); 124 wc = *s++ & 0xff; 125 if (len == 2) { 126 if (n < 2) { 127 /* Incomplete multibyte sequence */ 128 gs->ch = wc; 129 return ((size_t)-2); 130 } 131 if (*s == '\0') { 132 errno = EILSEQ; 133 return ((size_t)-1); 134 } 135 wc = (wc << 8) | (*s++ & 0xff); 136 if (pwc != NULL) 137 *pwc = wc; 138 return (2); 139 } else { 140 if (pwc != NULL) 141 *pwc = wc; 142 return (wc == L'\0' ? 0 : 1); 143 } 144} 145 146static size_t 147_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 148{ 149 _GBKState *gs; 150 151 gs = (_GBKState *)ps; 152 153 if (gs->ch != 0) { 154 errno = EINVAL; 155 return ((size_t)-1); 156 } 157 158 if (s == NULL) 159 /* Reset to initial shift state (no-op) */ 160 return (1); 161 if (wc & 0x8000) { 162 *s++ = (wc >> 8) & 0xff; 163 *s = wc & 0xff; 164 return (2); 165 } 166 *s = wc & 0xff; 167 return (1); 168} 169