locale/FreeBSD/big5.c

   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: src/lib/libc/locale/big5.c,v 1.7 2002/03/22 21:52:18 obrien Exp $");
  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 }