1 files changed, 13 insertions, 0 deletions
diff --git a/LibC/ctype.cpp b/LibC/ctype.cpp
index ba4eb48a2b..af37f95036 100644
--- a/LibC/ctype.cpp
+++ b/LibC/ctype.cpp
@@ -1,3 +1,16 @@
 #include <ctype.h>
 #include <string.h>
 
+int __tolower(int c)
+{
+    if (c >= 'A' && c <= 'Z')
+        return c | 0x20;
+    return c;
+}
+
+int __toupper(int c)
+{
+    if (c >= 'a' && c <= 'z')
+        return c & ~0x20;
+    return c;
+}