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-rw-r--r--src/ctype/toupper.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/ctype/toupper.c b/src/ctype/toupper.c
new file mode 100644
index 00000000..1799f030
--- /dev/null
+++ b/src/ctype/toupper.c
@@ -0,0 +1,7 @@
+#include <ctype.h>
+
+int toupper(int c)
+{
+ if (islower(c)) return c & 0x5f;
+ return c;
+}