1 files changed, 33 insertions, 0 deletions
diff --git a/libc/random.c b/libc/random.c
new file mode 100644
index 0000000..7ad8a67
--- /dev/null
+++ b/libc/random.c
@@ -0,0 +1,33 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#include <def.h>
+#include <mem.h>
+#include <random.h>
+
+static u32 g_seed = 0;
+
+void srand(u32 seed)
+{
+	g_seed = seed;
+}
+
+u32 rand()
+{
+	g_seed = (214013 * g_seed + 2531011);
+	return (g_seed >> 16) & 0x7FFF;
+}
+
+char *randstr(u32 size)
+{
+	char *buf = malloc(size + 1);
+	const char charset[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+	size--;
+	for (u32 i = 0; i < size; i++) {
+		int key = rand() % (sizeof(charset) - 1);
+		buf[i] = charset[key];
+	}
+	buf[size] = '\0';
+
+	return buf;
+}