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 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <rune.h> 44 #include <stddef.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <sys/types.h> 48 49 rune_t _BIG5_sgetrune(const char *, size_t, char const **); 50 int _BIG5_sputrune(rune_t, char *, size_t, char **); 51 52 int 53 _BIG5_init(rl) 54 _RuneLocale *rl; 55 { 56 rl->sgetrune = _BIG5_sgetrune; 57 rl->sputrune = _BIG5_sputrune; 58 _CurrentRuneLocale = rl; 59 __mb_cur_max = 2; 60 return (0); 61 } 62 63 static inline int 64 _big5_check(c) 65 u_int c; 66 { 67 c &= 0xff; 68 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 69 } 70 71 rune_t 72 _BIG5_sgetrune(string, n, result) 73 const char *string; 74 size_t n; 75 char const **result; 76 { 77 rune_t rune = 0; 78 int len; 79 80 if (n < 1 || (len = _big5_check(*string)) > n) { 81 if (result) 82 *result = string; 83 return (_INVALID_RUNE); 84 } 85 while (--len >= 0) 86 rune = (rune << 8) | ((u_int)(*string++) & 0xff); 87 if (result) 88 *result = string; 89 return rune; 90 } 91 92 int 93 _BIG5_sputrune(c, string, n, result) 94 rune_t c; 95 char *string, **result; 96 size_t n; 97 { 98 if (c & 0x8000) { 99 if (n >= 2) { 100 string[0] = (c >> 8) & 0xff; 101 string[1] = c & 0xff; 102 if (result) 103 *result = string + 2; 104 return (2); 105 } 106 } 107 else { 108 if (n >= 1) { 109 *string = c & 0xff; 110 if (result) 111 *result = string + 1; 112 return (1); 113 } 114 } 115 if (result) 116 *result = string; 117 return (0); 118 119 } 120