user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/options/bsd/generic/ether.cpp

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <bits/ensure.h>
+#include <netinet/ether.h>
+
+char *ether_ntoa(const struct ether_addr *addr) {
+	static char x[18];
+	return ether_ntoa_r (addr, x);
+}
+
+char *ether_ntoa_r(const struct ether_addr *addr, char *buf) {
+	char *orig_ptr = buf;
+
+	for(int i = 0; i < ETH_ALEN; i++) {
+		buf += sprintf(buf, i == 0 ? "%.2X" : ":%.2X", addr->ether_addr_octet[i]);
+	}
+
+	return orig_ptr;
+}
+
+struct ether_addr *ether_aton(const char *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}