gbk.c revision 128004
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 128004 2004-04-07 10:48:19Z tjr $"); 40 41#include <runetype.h> 42#include <stdlib.h> 43#include <string.h> 44#include <wchar.h> 45 46extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict, 47 size_t, mbstate_t * __restrict); 48extern int (*__mbsinit)(const mbstate_t *); 49extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict); 50 51int _GBK_init(_RuneLocale *); 52size_t _GBK_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t, 53 mbstate_t * __restrict); 54int _GBK_mbsinit(const mbstate_t *); 55size_t _GBK_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict); 56 57typedef struct { 58 int count; 59 u_char bytes[2]; 60} _GBKState; 61 62int 63_GBK_init(_RuneLocale *rl) 64{ 65 66 __mbrtowc = _GBK_mbrtowc; 67 __wcrtomb = _GBK_wcrtomb; 68 __mbsinit = _GBK_mbsinit; 69 _CurrentRuneLocale = rl; 70 __mb_cur_max = 2; 71 return (0); 72} 73 74int 75_GBK_mbsinit(const mbstate_t *ps) 76{ 77 78 return (ps == NULL || ((_GBKState *)ps)->count == 0); 79} 80 81static __inline int 82_gbk_check(u_int c) 83{ 84 85 c &= 0xff; 86 return ((c >= 0x81 && c <= 0xfe) ? 2 : 1); 87} 88 89size_t 90_GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 91 mbstate_t * __restrict ps) 92{ 93 _GBKState *gs; 94 wchar_t wc; 95 int i, len, ocount; 96 size_t ncopy; 97 98 gs = (_GBKState *)ps; 99 100 if (s == NULL) { 101 s = ""; 102 n = 1; 103 pwc = NULL; 104 } 105 106 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 107 memcpy(gs->bytes + gs->count, s, ncopy); 108 ocount = gs->count; 109 gs->count += ncopy; 110 s = (char *)gs->bytes; 111 n = gs->count; 112 113 if (n == 0 || (size_t)(len = _gbk_check(*s)) > n) 114 /* Incomplete multibyte sequence */ 115 return ((size_t)-2); 116 wc = 0; 117 i = len; 118 while (i-- > 0) 119 wc = (wc << 8) | (unsigned char)*s++; 120 if (pwc != NULL) 121 *pwc = wc; 122 gs->count = 0; 123 return (wc == L'\0' ? 0 : len - ocount); 124} 125 126size_t 127_GBK_wcrtomb(char * __restrict s, wchar_t wc, 128 mbstate_t * __restrict ps __unused) 129{ 130 131 if (s == NULL) 132 /* Reset to initial shift state (no-op) */ 133 return (1); 134 if (wc & 0x8000) { 135 *s++ = (wc >> 8) & 0xff; 136 *s = wc & 0xff; 137 return (2); 138 } 139 *s = wc & 0xff; 140 return (1); 141} 142