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/*-
* Copyright (c) 2002-2004 Tim J. Robbins
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* UTF2 encoding.
*
* This is an obsolete subset of UTF-8, maintained for temporary
* compatibility with old applications. It is limited to 1-, 2- or
* 3-byte encodings, and allows redundantly-encoded characters.
*
* See utf2(5) for details.
*/
/* UTF2 is obsolete and will be removed in FreeBSD 6 -- use UTF-8 instead. */
#define OBSOLETE_IN_6
#include <sys/param.h>
__FBSDID("$FreeBSD$");
#include <errno.h>
#include <runetype.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
size_t, mbstate_t * __restrict);
extern int (*__mbsinit)(const mbstate_t *);
extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict);
size_t _UTF2_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
mbstate_t * __restrict);
int _UTF2_mbsinit(const mbstate_t *);
size_t _UTF2_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
typedef struct {
int count;
u_char bytes[3];
} _UTF2State;
int
_UTF2_init(_RuneLocale *rl)
{
__mbrtowc = _UTF2_mbrtowc;
__wcrtomb = _UTF2_wcrtomb;
__mbsinit = _UTF2_mbsinit;
_CurrentRuneLocale = rl;
__mb_cur_max = 3;
return (0);
}
int
_UTF2_mbsinit(const mbstate_t *ps)
{
return (ps == NULL || ((const _UTF2State *)ps)->count == 0);
}
size_t
_UTF2_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
mbstate_t * __restrict ps)
{
_UTF2State *us;
int ch, i, len, mask, ocount;
wchar_t wch;
size_t ncopy;
us = (_UTF2State *)ps;
if (us->count < 0 || us->count > sizeof(us->bytes)) {
errno = EINVAL;
return ((size_t)-1);
}
if (s == NULL) {
s = "";
n = 1;
pwc = NULL;
}
ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(us->bytes) - us->count);
memcpy(us->bytes + us->count, s, ncopy);
ocount = us->count;
us->count += ncopy;
s = (char *)us->bytes;
n = us->count;
if (n == 0)
return ((size_t)-2);
ch = (unsigned char)*s;
if ((ch & 0x80) == 0) {
mask = 0x7f;
len = 1;
} else if ((ch & 0xe0) == 0xc0) {
mask = 0x1f;
len = 2;
} else if ((ch & 0xf0) == 0xe0) {
mask = 0x0f;
len = 3;
} else {
errno = EILSEQ;
return ((size_t)-1);
}
if (n < (size_t)len)
return ((size_t)-2);
wch = (unsigned char)*s++ & mask;
i = len;
while (--i != 0) {
if ((*s & 0xc0) != 0x80) {
errno = EILSEQ;
return ((size_t)-1);
}
wch <<= 6;
wch |= *s++ & 0x3f;
}
if (pwc != NULL)
*pwc = wch;
us->count = 0;
return (wch == L'\0' ? 0 : len - ocount);
}
size_t
_UTF2_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps)
{
_UTF2State *us;
unsigned char lead;
int i, len;
us = (_UTF2State *)ps;
if (us->count != 0) {
errno = EINVAL;
return ((size_t)-1);
}
if (s == NULL)
/* Reset to initial conversion state. */
return (1);
if ((wc & ~0x7f) == 0) {
lead = 0;
len = 1;
} else if ((wc & ~0x7ff) == 0) {
lead = 0xc0;
len = 2;
} else if ((wc & ~0xffff) == 0) {
lead = 0xe0;
len = 3;
} else {
errno = EILSEQ;
return ((size_t)-1);
}
for (i = len - 1; i > 0; i--) {
s[i] = (wc & 0x3f) | 0x80;
wc >>= 6;
}
*s = (wc & 0xff) | lead;
return (len);
}
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