1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/libc/ctype/tolower.c b/kernel/libc/ctype/tolower.c
new file mode 100644
index 0000000..f1bb163
--- /dev/null
+++ b/kernel/libc/ctype/tolower.c
@@ -0,0 +1,7 @@
+#include <ctype.h>
+
+int tolower(int c) {
+  if (c >= 'A' && c <= 'Z')
+    return c - 'A' + 'a';
+  return c;
+}