gbk.c revision 165903
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 165903 2007-01-09 00:28:16Z imp $"); 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 45static size_t _GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, 46 size_t, mbstate_t * __restrict); 47static int _GBK_mbsinit(const mbstate_t *); 48static size_t _GBK_wcrtomb(char * __restrict, wchar_t, 49 mbstate_t * __restrict); 50 51typedef struct { 52 wchar_t ch; 53} _GBKState; 54 55int 56_GBK_init(_RuneLocale *rl) 57{ 58 59 __mbrtowc = _GBK_mbrtowc; 60 __wcrtomb = _GBK_wcrtomb; 61 __mbsinit = _GBK_mbsinit; 62 _CurrentRuneLocale = rl; 63 __mb_cur_max = 2; 64 return (0); 65} 66 67static int 68_GBK_mbsinit(const mbstate_t *ps) 69{ 70 71 return (ps == NULL || ((const _GBKState *)ps)->ch == 0); 72} 73 74static __inline int 75_gbk_check(u_int c) 76{ 77 78 c &= 0xff; 79 return ((c >= 0x81 && c <= 0xfe) ? 2 : 1); 80} 81 82static size_t 83_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 84 mbstate_t * __restrict ps) 85{ 86 _GBKState *gs; 87 wchar_t wc; 88 size_t len; 89 90 gs = (_GBKState *)ps; 91 92 if ((gs->ch & ~0xFF) != 0) { 93 /* Bad conversion state. */ 94 errno = EINVAL; 95 return ((size_t)-1); 96 } 97 98 if (s == NULL) { 99 s = ""; 100 n = 1; 101 pwc = NULL; 102 } 103 104 if (n == 0) 105 /* Incomplete multibyte sequence */ 106 return ((size_t)-2); 107 108 if (gs->ch != 0) { 109 if (*s == '\0') { 110 errno = EILSEQ; 111 return ((size_t)-1); 112 } 113 wc = (gs->ch << 8) | (*s & 0xFF); 114 if (pwc != NULL) 115 *pwc = wc; 116 gs->ch = 0; 117 return (1); 118 } 119 120 len = (size_t)_gbk_check(*s); 121 wc = *s++ & 0xff; 122 if (len == 2) { 123 if (n < 2) { 124 /* Incomplete multibyte sequence */ 125 gs->ch = wc; 126 return ((size_t)-2); 127 } 128 if (*s == '\0') { 129 errno = EILSEQ; 130 return ((size_t)-1); 131 } 132 wc = (wc << 8) | (*s++ & 0xff); 133 if (pwc != NULL) 134 *pwc = wc; 135 return (2); 136 } else { 137 if (pwc != NULL) 138 *pwc = wc; 139 return (wc == L'\0' ? 0 : 1); 140 } 141} 142 143static size_t 144_GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 145{ 146 _GBKState *gs; 147 148 gs = (_GBKState *)ps; 149 150 if (gs->ch != 0) { 151 errno = EINVAL; 152 return ((size_t)-1); 153 } 154 155 if (s == NULL) 156 /* Reset to initial shift state (no-op) */ 157 return (1); 158 if (wc & 0x8000) { 159 *s++ = (wc >> 8) & 0xff; 160 *s = wc & 0xff; 161 return (2); 162 } 163 *s = wc & 0xff; 164 return (1); 165} 166