user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/options/bsd/generic/arpa-nameser.cpp

@@ -0,0 +1,41 @@
+#include <errno.h>
+#include <arpa/nameser.h>
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+
+// The ns_get* and ns_put* functions are taken from musl.
+unsigned ns_get16(const unsigned char *cp) {
+	return cp[0] << 8 | cp[1];
+}
+
+unsigned long ns_get32(const unsigned char *cp) {
+	return (unsigned)cp[0] << 24 | cp[1] << 16 | cp[2] << 8 | cp[3];
+}
+
+void ns_put16(unsigned s, unsigned char *cp) {
+	*cp++ = s >> 8;
+	*cp++ = s;
+}
+
+void ns_put32(unsigned long l, unsigned char *cp) {
+	*cp++ = l >> 24;
+	*cp++ = l >> 16;
+	*cp++ = l >> 8;
+	*cp++ = l;
+}
+
+int ns_initparse(const unsigned char *, int, ns_msg *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int ns_parserr(ns_msg *, ns_sect, int, ns_rr *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int ns_name_uncompress(const unsigned char *, const unsigned char *,
+				    const unsigned char *, char *, size_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}