1 files changed, 7 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/lib/isupper.c b/mdk-stage1/dietlibc/lib/isupper.c
new file mode 100644
index 000000000..933dfc169
--- /dev/null
+++ b/mdk-stage1/dietlibc/lib/isupper.c
@@ -0,0 +1,7 @@
+#include <ctype.h>
+
+int __isupper_ascii(int c) {
+  return (c>='A' && c<='Z');
+}
+
+int isupper(int c) __attribute__((weak,alias("__isupper_ascii")));