CCHARW_MAX
wchar_t wstr[CCHARW_MAX + 1];
if ((width > 0 && l > 0) || l == CCHARW_MAX) {
wp = wmemchr(wcval->vals, L'\0', CCHARW_MAX);
len = wp ? wp - wcval->vals : CCHARW_MAX;
if (len > CCHARW_MAX || (len > 1 && wcwidth(wch[0]) < 0))