locale/big5-fbsd.c

   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 #if defined(LIBC_SCCS) && !defined(lint)
  39 static char sccsid[] = "@(#)big5.c      8.1 (Berkeley) 6/4/93";
  40 #endif /* LIBC_SCCS and not lint */
  41 #include <sys/param.h>
  42 __FBSDID("$FreeBSD: src/lib/libc/locale/big5.c,v 1.16 2004/05/17 11:16:14 tjr Exp $");
  43
  44 #include "xlocale_private.h"
  45
  46 #include <errno.h>
  47 #include <runetype.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <wchar.h>
  51 #include "mblocal.h"
  52
  53 __private_extern__ int  _BIG5_init(struct __xlocale_st_runelocale *);
  54 static size_t   _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
  55             mbstate_t * __restrict, locale_t);
  56 static int      _BIG5_mbsinit(const mbstate_t *, locale_t);
  57 static size_t   _BIG5_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict, locale_t);
  58
  59 typedef struct {
  60         wchar_t ch;
  61 } _BIG5State;
  62
  63 __private_extern__ int
  64 _BIG5_init(struct __xlocale_st_runelocale *xrl)
  65 {
  66
  67         xrl->__mbrtowc = _BIG5_mbrtowc;
  68         xrl->__wcrtomb = _BIG5_wcrtomb;
  69         xrl->__mbsinit = _BIG5_mbsinit;
  70         xrl->__mb_cur_max = 2;
  71         return (0);
  72 }
  73
  74 static int
  75 _BIG5_mbsinit(const mbstate_t *ps, locale_t loc)
  76 {
  77
  78         return (ps == NULL || ((const _BIG5State *)ps)->ch == 0);
  79 }
  80
  81 static __inline int
  82 _big5_check(u_int c)
  83 {
  84
  85         c &= 0xff;
  86         return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
  87 }
  88
  89 static size_t
  90 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
  91     mbstate_t * __restrict ps, locale_t loc)
  92 {
  93         _BIG5State *bs;
  94         wchar_t wc;
  95         size_t len;
  96
  97         bs = (_BIG5State *)ps;
  98
  99         if ((bs->ch & ~0xFF) != 0) {
 100                 /* Bad conversion state. */
 101                 errno = EINVAL;
 102                 return ((size_t)-1);
 103         }
 104
 105         if (s == NULL) {
 106                 s = "";
 107                 n = 1;
 108                 pwc = NULL;
 109         }
 110
 111         if (n == 0)
 112                 /* Incomplete multibyte sequence */
 113                 return ((size_t)-2);
 114
 115         if (bs->ch != 0) {
 116                 if (*s == '\0') {
 117                         errno = EILSEQ;
 118                         return ((size_t)-1);
 119                 }
 120                 wc = (bs->ch << 8) | (*s & 0xFF);
 121                 if (pwc != NULL)
 122                         *pwc = wc;
 123                 bs->ch = 0;
 124                 return (1);
 125         }
 126
 127         len = (size_t)_big5_check(*s);
 128         wc = *s++ & 0xff;
 129         if (len == 2) {
 130                 if (n < 2) {
 131                         /* Incomplete multibyte sequence */
 132                         bs->ch = wc;
 133                         return ((size_t)-2);
 134                 }
 135                 if (*s == '\0') {
 136                         errno = EILSEQ;
 137                         return ((size_t)-1);
 138                 }
 139                 wc = (wc << 8) | (*s++ & 0xff);
 140                 if (pwc != NULL)
 141                         *pwc = wc;
 142                 return (2);
 143         } else {
 144                 if (pwc != NULL)
 145                         *pwc = wc;
 146                 return (wc == L'\0' ? 0 : 1);
 147         }
 148 }
 149
 150 static size_t
 151 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc)
 152 {
 153         _BIG5State *bs;
 154
 155         bs = (_BIG5State *)ps;
 156
 157         if (bs->ch != 0) {
 158                 errno = EINVAL;
 159                 return ((size_t)-1);
 160         }
 161
 162         if (s == NULL)
 163                 /* Reset to initial shift state (no-op) */
 164                 return (1);
 165         if (wc & 0x8000) {
 166                 *s++ = (wc >> 8) & 0xff;
 167                 *s = wc & 0xff;
 168                 return (2);
 169         }
 170         *s = wc & 0xff;
 171         return (1);
 172 }