locale/FreeBSD/gbk.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  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD: src/lib/libc/locale/gbk.c,v 1.14 2007/10/13 16:28:21 ache Exp $");
  36
  37 #include "xlocale_private.h"
  38
  39 #include <sys/types.h>
  40 #include <errno.h>
  41 #include <runetype.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <wchar.h>
  45 #include "mblocal.h"
  46
  47 static size_t   _GBK_mbrtowc(wchar_t * __restrict, const char * __restrict,
  48                     size_t, mbstate_t * __restrict, locale_t);
  49 static int      _GBK_mbsinit(const mbstate_t *, locale_t);
  50 static size_t   _GBK_wcrtomb(char * __restrict, wchar_t,
  51                     mbstate_t * __restrict, locale_t);
  52
  53 typedef struct {
  54         wchar_t ch;
  55 } _GBKState;
  56
  57 __private_extern__ int
  58 _GBK_init(struct __xlocale_st_runelocale *xrl)
  59 {
  60
  61         xrl->__mbrtowc = _GBK_mbrtowc;
  62         xrl->__wcrtomb = _GBK_wcrtomb;
  63         xrl->__mbsinit = _GBK_mbsinit;
  64         xrl->__mb_cur_max = 2;
  65         xrl->__mb_sb_limit = 128;
  66         return (0);
  67 }
  68
  69 static int
  70 _GBK_mbsinit(const mbstate_t *ps, locale_t loc __unused)
  71 {
  72
  73         return (ps == NULL || ((const _GBKState *)ps)->ch == 0);
  74 }
  75
  76 static __inline int
  77 _gbk_check(u_int c)
  78 {
  79
  80         c &= 0xff;
  81         return ((c >= 0x81 && c <= 0xfe) ? 2 : 1);
  82 }
  83
  84 static size_t
  85 _GBK_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
  86     mbstate_t * __restrict ps, locale_t loc __unused)
  87 {
  88         _GBKState *gs;
  89         wchar_t wc;
  90         size_t len;
  91
  92         gs = (_GBKState *)ps;
  93
  94         if ((gs->ch & ~0xFF) != 0) {
  95                 /* Bad conversion state. */
  96                 errno = EINVAL;
  97                 return ((size_t)-1);
  98         }
  99
 100         if (s == NULL) {
 101                 s = "";
 102                 n = 1;
 103                 pwc = NULL;
 104         }
 105
 106         if (n == 0)
 107                 /* Incomplete multibyte sequence */
 108                 return ((size_t)-2);
 109
 110         if (gs->ch != 0) {
 111                 if (*s == '\0') {
 112                         errno = EILSEQ;
 113                         return ((size_t)-1);
 114                 }
 115                 wc = (gs->ch << 8) | (*s & 0xFF);
 116                 if (pwc != NULL)
 117                         *pwc = wc;
 118                 gs->ch = 0;
 119                 return (1);
 120         }
 121
 122         len = (size_t)_gbk_check(*s);
 123         wc = *s++ & 0xff;
 124         if (len == 2) {
 125                 if (n < 2) {
 126                         /* Incomplete multibyte sequence */
 127                         gs->ch = wc;
 128                         return ((size_t)-2);
 129                 }
 130                 if (*s == '\0') {
 131                         errno = EILSEQ;
 132                         return ((size_t)-1);
 133                 }
 134                 wc = (wc << 8) | (*s++ & 0xff);
 135                 if (pwc != NULL)
 136                         *pwc = wc;
 137                 return (2);
 138         } else {
 139                 if (pwc != NULL)
 140                         *pwc = wc;
 141                 return (wc == L'\0' ? 0 : 1);
 142         }
 143 }
 144
 145 static size_t
 146 _GBK_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
 147 {
 148         _GBKState *gs;
 149
 150         gs = (_GBKState *)ps;
 151
 152         if (gs->ch != 0) {
 153                 errno = EINVAL;
 154                 return ((size_t)-1);
 155         }
 156
 157         if (s == NULL)
 158                 /* Reset to initial shift state (no-op) */
 159                 return (1);
 160         if (wc & 0x8000) {
 161                 *s++ = (wc >> 8) & 0xff;
 162                 *s = wc & 0xff;
 163                 return (2);
 164         }
 165         *s = wc & 0xff;
 166         return (1);
 167 }