user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/sysdeps/managarm/generic/ensure.cpp

@@ -0,0 +1,37 @@
+
+#include <assert.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <bits/ensure.h>
+#include <mlibc/all-sysdeps.hpp>
+#include <mlibc/debug.hpp>
+
+#include <hel-syscalls.h>
+#include <hel.h>
+
+void __frigg_assert_fail(
+    const char *assertion, const char *file, unsigned int line, const char *function
+) {
+	mlibc::panicLogger() << "In function " << function << ", file " << file << ":" << line << "\n"
+	                     << "__ensure(" << assertion << ") failed" << frg::endlog;
+}
+
+namespace mlibc {
+void sys_libc_log(const char *message) {
+	// This implementation is inherently signal-safe.
+	size_t n = 0;
+	while (message[n])
+		n++;
+	HEL_CHECK(helLog(kHelLogSeverityInfo, message, n));
+}
+
+void sys_libc_panic() {
+	// This implementation is inherently signal-safe.
+	const char *message = "mlibc: Panic!";
+	size_t n = 0;
+	while (message[n])
+		n++;
+	helPanic(message, n);
+}
+} // namespace mlibc