1 files changed, 7 insertions, 0 deletions
diff --git a/userland/libc/ctype/toupper.c b/userland/libc/ctype/toupper.c
new file mode 100644
index 0000000..0f33886
--- /dev/null
+++ b/userland/libc/ctype/toupper.c
@@ -0,0 +1,7 @@
+#include <ctype.h>
+
+int toupper(int c) {
+  if (c >= 'a' && c <= 'z')
+    return c - 'a' + 'A';
+  return c;
+}