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#include <stdlib.h>
#include <wchar.h>
#include <errno.h>
#include "internal.h"
size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate_t *restrict st)
{
static unsigned internal_state;
unsigned c;
const unsigned char *s = (const void *)src;
const size_t N = n;
wchar_t dummy;
if (!st) st = (void *)&internal_state;
c = *(unsigned *)st;
if (!s) {
if (c) goto ilseq;
return 0;
} else if (!wc) wc = &dummy;
if (!n) return -2;
if (!c) {
if (*s < 0x80) return !!(*wc = *s);
if (MB_CUR_MAX==1) return (*wc = CODEUNIT(*s)), 1;
if (*s-SA > SB-SA) goto ilseq;
c = bittab[*s++-SA]; n--;
}
if (n) {
if (OOB(c,*s)) goto ilseq;
loop:
c = c<<6 | *s++-0x80; n--;
if (!(c&(1U<<31))) {
*(unsigned *)st = 0;
*wc = c;
return N-n;
}
if (n) {
if (*s-0x80u >= 0x40) goto ilseq;
goto loop;
}
}
*(unsigned *)st = c;
return -2;
ilseq:
*(unsigned *)st = 0;
errno = EILSEQ;
return -1;
}
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