First proper commit.

src/libultra_boot_O2/string.c

@@ -0,0 +1,33 @@
+#include <global.h>
+
+const u8 *strchr(const u8 *str, s32 ch)
+{
+    u8 c = ch;
+    while (*str != c)
+    {
+        if (*str == 0)
+            return NULL;
+        str++;
+    }
+    return str;
+}
+
+size_t strlen(const u8 *str)
+{
+    const u8 *ptr = str;
+    while (*ptr)
+        ptr++;
+    return ptr - str;
+}
+
+void *memcpy(void *dst, const void *src, size_t size)
+{
+    u8 *_dst = dst;
+    const u8 *_src = src;
+    while (size > 0)
+    {
+        *_dst++ = *_src++;
+        size--;
+    }
+    return dst;
+}