1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Paul Borman at Krystal Technologies. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD: src/lib/libc/locale/big5.c,v 1.3.2.2 2001/03/05 10:02:54 obrien Exp $ 37 * $DragonFly: src/lib/libc/locale/Attic/big5.c,v 1.4 2003/12/02 14:56:28 eirikn Exp $ 38 * 39 * @(#)big5.c 8.1 (Berkeley) 6/4/93 40 */ 41 42 #include <rune.h> 43 #include <stdlib.h> 44 #include <sys/types.h> 45 46 rune_t _BIG5_sgetrune (const char *, size_t, char const **); 47 int _BIG5_sputrune (rune_t, char *, size_t, char **); 48 49 int 50 _BIG5_init(rl) 51 _RuneLocale *rl; 52 { 53 rl->sgetrune = _BIG5_sgetrune; 54 rl->sputrune = _BIG5_sputrune; 55 _CurrentRuneLocale = rl; 56 __mb_cur_max = 2; 57 return (0); 58 } 59 60 static inline int 61 _big5_check(c) 62 u_int c; 63 { 64 c &= 0xff; 65 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 66 } 67 68 rune_t 69 _BIG5_sgetrune(string, n, result) 70 const char *string; 71 size_t n; 72 char const **result; 73 { 74 rune_t rune = 0; 75 int len; 76 77 if (n < 1 || (len = _big5_check(*string)) > n) { 78 if (result) 79 *result = string; 80 return (_INVALID_RUNE); 81 } 82 while (--len >= 0) 83 rune = (rune << 8) | ((u_int)(*string++) & 0xff); 84 if (result) 85 *result = string; 86 return rune; 87 } 88 89 int 90 _BIG5_sputrune(c, string, n, result) 91 rune_t c; 92 char *string, **result; 93 size_t n; 94 { 95 if (c & 0x8000) { 96 if (n >= 2) { 97 string[0] = (c >> 8) & 0xff; 98 string[1] = c & 0xff; 99 if (result) 100 *result = string + 2; 101 return (2); 102 } 103 } 104 else { 105 if (n >= 1) { 106 *string = c & 0xff; 107 if (result) 108 *result = string + 1; 109 return (1); 110 } 111 } 112 if (result) 113 *result = string; 114 return (0); 115 116 } 117