libc: move fill_random to kernel/util

util/random.c

@@ -0,0 +1,36 @@
+#include <mango/util.h>
+
+static unsigned int random_seed = 53455346;
+
+bool fill_random(void *p, unsigned int size)
+{
+	unsigned char *buffer = p;
+
+	if (!buffer || !size) {
+		return false;
+	}
+
+	for (uint32_t i = 0; i < size; i++) {
+		uint32_t next = random_seed;
+		uint32_t result;
+
+		next *= 1103515245;
+		next += 12345;
+		result = (uint32_t)(next / 65536) % 2048;
+
+		next *= 1103515245;
+		next += 12345;
+		result <<= 10;
+		result ^= (uint32_t)(next / 65536) % 1024;
+
+		next *= 1103515245;
+		next += 12345;
+		result <<= 10;
+		result ^= (uint32_t)(next / 65536) % 1024;
+		random_seed = next;
+
+		buffer[i] = (uint8_t)(result % 256);
+	}
+
+	return true;
+}