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#include <wchar.h>
size_t wcsrtombs(char *restrict s, const wchar_t **restrict ws, size_t n, mbstate_t *restrict st)
{
const wchar_t *ws2;
char buf[4];
size_t N = n, l;
if (!s) {
for (n=0, ws2=*ws; *ws2; ws2++) {
if (*ws2 >= 0x80u) {
l = wcrtomb(buf, *ws2, 0);
if (!(l+1)) return -1;
n += l;
} else n++;
}
return n;
}
while (n>=4) {
if (**ws-1u >= 0x7fu) {
if (!**ws) {
*s = 0;
*ws = 0;
return N-n;
}
l = wcrtomb(s, **ws, 0);
if (!(l+1)) return -1;
s += l;
n -= l;
} else {
*s++ = **ws;
n--;
}
(*ws)++;
}
while (n) {
if (**ws-1u >= 0x7fu) {
if (!**ws) {
*s = 0;
*ws = 0;
return N-n;
}
l = wcrtomb(buf, **ws, 0);
if (!(l+1)) return -1;
if (l>n) return N-n;
wcrtomb(s, **ws, 0);
s += l;
n -= l;
} else {
*s++ = **ws;
n--;
}
(*ws)++;
}
return N;
}
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