user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/tests/glibc/ffsl-ffsll.c

@@ -0,0 +1,36 @@
+#include <assert.h>
+#include <stdint.h>
+#include <string.h>
+#include <limits.h>
+
+int main(void){
+	// ffsl
+	assert(ffsl(0x8000) == 16);
+	assert(ffsl(0) == 0);
+#if UINTPTR_MAX == UINT64_MAX
+	assert(ffsl(LLONG_MAX - 1) ==  2);
+	assert(ffsl(LLONG_MAX) == 1);
+#endif
+	assert(ffsl(LONG_MIN) == (long)(sizeof(long) * CHAR_BIT));
+	assert(ffsl(LONG_MIN + 1) == 1);
+
+	for (int i = 1; i < 0x1000; i++) {
+		assert(ffsl(i) - 1 == __builtin_ctz(i));
+	}
+
+	// ffsll
+	assert(ffsll(0x8000) == 16);
+	assert(ffsll(0) == 0);
+#if UINTPTR_MAX == UINT64_MAX
+	assert(ffsll(LLONG_MAX - 1) ==  2);
+	assert(ffsll(LLONG_MAX) == 1);
+#endif
+	assert(ffsll(LLONG_MIN) == (long long)(sizeof(long long) * CHAR_BIT));
+	assert(ffsll(LLONG_MIN + 1) == 1);
+
+	for (int i = 1; i < 0x1000; i++) {
+		assert(ffsll(i) - 1 == __builtin_ctz(i));
+	}
+
+	return 0;
+}