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 * $FreeBSD$ 37 */ 38 39 #if defined(LIBC_SCCS) && !defined(lint) 40 static char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93"; 41 #endif /* LIBC_SCCS and not lint */ 42 43 #include <errno.h> 44 #include <rune.h> 45 #include <stddef.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <sys/types.h> 49 50 rune_t _BIG5_sgetrune __P((const char *, size_t, char const **)); 51 int _BIG5_sputrune __P((rune_t, char *, size_t, char **)); 52 53 int 54 _BIG5_init(rl) 55 _RuneLocale *rl; 56 { 57 rl->sgetrune = _BIG5_sgetrune; 58 rl->sputrune = _BIG5_sputrune; 59 _CurrentRuneLocale = rl; 60 __mb_cur_max = 2; 61 return (0); 62 } 63 64 static inline int 65 _big5_check(c) 66 u_int c; 67 { 68 c &= 0xff; 69 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 70 } 71 72 rune_t 73 _BIG5_sgetrune(string, n, result) 74 const char *string; 75 size_t n; 76 char const **result; 77 { 78 rune_t rune = 0; 79 int len; 80 81 if (n < 1 || (len = _big5_check(*string)) > n) { 82 if (result) 83 *result = string; 84 return (_INVALID_RUNE); 85 } 86 while (--len >= 0) 87 rune = (rune << 8) | ((u_int)(*string++) & 0xff); 88 if (result) 89 *result = string; 90 return rune; 91 } 92 93 int 94 _BIG5_sputrune(c, string, n, result) 95 rune_t c; 96 char *string, **result; 97 size_t n; 98 { 99 if (c & 0x8000) { 100 if (n >= 2) { 101 string[0] = (c >> 8) & 0xff; 102 string[1] = c & 0xff; 103 if (result) 104 *result = string + 2; 105 return (2); 106 } 107 } 108 else { 109 if (n >= 1) { 110 *string = c & 0xff; 111 if (result) 112 *result = string + 1; 113 return (1); 114 } 115 } 116 if (result) 117 *result = string; 118 return (0); 119 120 } 121