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#include <stdlib.h>
/*
* Use the FSS-UTF transformation proposed by posix.
* We define 7 byte types:
* T0 0xxxxxxx 7 free bits
* Tx 10xxxxxx 6 free bits
* T1 110xxxxx 5 free bits
* T2 1110xxxx 4 free bits
*
* Encoding is as follows.
* From hex Thru hex Sequence Bits
* 00000000 0000007F T0 7
* 00000080 000007FF T1 Tx 11
* 00000800 0000FFFF T2 Tx Tx 16
*/
int
mblen(const char *s, size_t n)
{
return mbtowc(0, s, n);
}
int
mbtowc(wchar_t *pwc, const char *s, size_t n)
{
int c, c1, c2;
long l;
if(!s)
return 0;
if(n < 1)
goto bad;
c = s[0] & 0xff;
if((c & 0x80) == 0x00) {
if(pwc)
*pwc = c;
if(c == 0)
return 0;
return 1;
}
if(n < 2)
goto bad;
c1 = (s[1] ^ 0x80) & 0xff;
if((c1 & 0xC0) != 0x00)
goto bad;
if((c & 0xE0) == 0xC0) {
l = ((c << 6) | c1) & 0x7FF;
if(l < 0x080)
goto bad;
if(pwc)
*pwc = l;
return 2;
}
if(n < 3)
goto bad;
c2 = (s[2] ^ 0x80) & 0xff;
if((c2 & 0xC0) != 0x00)
goto bad;
if((c & 0xF0) == 0xE0) {
l = ((((c << 6) | c1) << 6) | c2) & 0xFFFF;
if(l < 0x0800)
goto bad;
if(pwc)
*pwc = l;
return 3;
}
/*
* bad decoding
*/
bad:
return -1;
}
int
wctomb(char *s, wchar_t wchar)
{
long c;
if(!s)
return 0;
c = wchar & 0xFFFF;
if(c < 0x80) {
s[0] = c;
return 1;
}
if(c < 0x800) {
s[0] = 0xC0 | (c >> 6);
s[1] = 0x80 | (c & 0x3F);
return 2;
}
s[0] = 0xE0 | (c >> 12);
s[1] = 0x80 | ((c >> 6) & 0x3F);
s[2] = 0x80 | (c & 0x3F);
return 3;
}
size_t
mbstowcs(wchar_t *pwcs, const char *s, size_t n)
{
int i, d, c;
for(i=0; i < n; i++) {
c = *s & 0xff;
if(c < 0x80) {
*pwcs = c;
if(c == 0)
break;
s++;
} else {
d = mbtowc(pwcs, s, 3);
if(d <= 0)
return (size_t)((d<0) ? -1 : i);
s += d;
}
pwcs++;
}
return i;
}
size_t
wcstombs(char *s, const wchar_t *pwcs, size_t n)
{
int d;
long c;
char *p, *pe;
char buf[3];
p = s;
pe = p+n-3;
while(p < pe) {
c = *pwcs++;
if(c < 0x80)
*p++ = c;
else
p += wctomb(p, c);
if(c == 0)
return p-s;
}
while(p < pe+3) {
c = *pwcs++;
d = wctomb(buf, c);
if(p+d <= pe+3) {
*p++ = buf[0];
if(d > 1) {
*p++ = buf[1];
if(d > 2)
*p++ = buf[2];
}
}
if(c == 0)
break;
}
return p-s;
}
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