Add nullcpy()

Invented function to memcpy() with a specific size, but add a null terminator.

luna/include/luna/CString.h

@@ -12,4 +12,7 @@ extern "C"
     usize wcslen(const wchar_t* str);
 
     char* strdup(const char* str);
+
+    // Copies len bytes from src into dest and adds a null terminator.
+    void nullcpy(char* dest, const char* src, usize len);
 }

luna/src/CString.cpp

@@ -65,4 +65,10 @@ extern "C"
 
         return dest;
     }
+
+    void nullcpy(char* dest, const char* src, usize len)
+    {
+        memcpy(dest, src, len);
+        dest[len] = 0;
+    }
 }