locale/FreeBSD/big5.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/cdefs.h>
  42 __FBSDID("$FreeBSD: src/lib/libc/locale/big5.c,v 1.18 2007/10/13 16:28:21 ache Exp $");
  43
  44 #include "xlocale_private.h"
  45
  46 #include <sys/types.h>
  47 #include <errno.h>
  48 #include <runetype.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <wchar.h>
  52 #include "mblocal.h"
  53
  54 static size_t   _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict,
  55                     size_t, 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,
  58                     mbstate_t * __restrict, locale_t);
  59
  60 typedef struct {
  61         wchar_t ch;
  62 } _BIG5State;
  63
  64 int
  65 _BIG5_init(struct __xlocale_st_runelocale *xrl)
  66 {
  67
  68         xrl->__mbrtowc = _BIG5_mbrtowc;
  69         xrl->__wcrtomb = _BIG5_wcrtomb;
  70         xrl->__mbsinit = _BIG5_mbsinit;
  71         xrl->__mb_cur_max = 2;
  72         xrl->__mb_sb_limit = 128;
  73         return (0);
  74 }
  75
  76 static int
  77 _BIG5_mbsinit(const mbstate_t *ps, locale_t loc __unused)
  78 {
  79
  80         return (ps == NULL || ((const _BIG5State *)ps)->ch == 0);
  81 }
  82
  83 static __inline int
  84 _big5_check(u_int c)
  85 {
  86
  87         c &= 0xff;
  88         return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
  89 }
  90
  91 static size_t
  92 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
  93     mbstate_t * __restrict ps, locale_t loc __unused)
  94 {
  95         _BIG5State *bs;
  96         wchar_t wc;
  97         size_t len;
  98
  99         bs = (_BIG5State *)ps;
 100
 101         if ((bs->ch & ~0xFF) != 0) {
 102                 /* Bad conversion state. */
 103                 errno = EINVAL;
 104                 return ((size_t)-1);
 105         }
 106
 107         if (s == NULL) {
 108                 s = "";
 109                 n = 1;
 110                 pwc = NULL;
 111         }
 112
 113         if (n == 0)
 114                 /* Incomplete multibyte sequence */
 115                 return ((size_t)-2);
 116
 117         if (bs->ch != 0) {
 118                 if (*s == '\0') {
 119                         errno = EILSEQ;
 120                         return ((size_t)-1);
 121                 }
 122                 wc = (bs->ch << 8) | (*s & 0xFF);
 123                 if (pwc != NULL)
 124                         *pwc = wc;
 125                 bs->ch = 0;
 126                 return (1);
 127         }
 128
 129         len = (size_t)_big5_check(*s);
 130         wc = *s++ & 0xff;
 131         if (len == 2) {
 132                 if (n < 2) {
 133                         /* Incomplete multibyte sequence */
 134                         bs->ch = wc;
 135                         return ((size_t)-2);
 136                 }
 137                 if (*s == '\0') {
 138                         errno = EILSEQ;
 139                         return ((size_t)-1);
 140                 }
 141                 wc = (wc << 8) | (*s++ & 0xff);
 142                 if (pwc != NULL)
 143                         *pwc = wc;
 144                 return (2);
 145         } else {
 146                 if (pwc != NULL)
 147                         *pwc = wc;
 148                 return (wc == L'\0' ? 0 : 1);
 149         }
 150 }
 151
 152 static size_t
 153 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
 154 {
 155         _BIG5State *bs;
 156
 157         bs = (_BIG5State *)ps;
 158
 159         if (bs->ch != 0) {
 160                 errno = EINVAL;
 161                 return ((size_t)-1);
 162         }
 163
 164         if (s == NULL)
 165                 /* Reset to initial shift state (no-op) */
 166                 return (1);
 167         if (wc & 0x8000) {
 168                 *s++ = (wc >> 8) & 0xff;
 169                 *s = wc & 0xff;
 170                 return (2);
 171         }
 172         *s = wc & 0xff;
 173         return (1);
 174 }