1 files changed, 12 insertions, 0 deletions
diff --git a/lib/libc/wctype/iswupper.c b/lib/libc/wctype/iswupper.c
new file mode 100644
index 00000000..afe12049
--- /dev/null
+++ b/lib/libc/wctype/iswupper.c
@@ -0,0 +1,12 @@
+#include <libc.h>
+#include <wctype.h>
+
+int iswupper(wint_t wc)
+{
+	return towlower(wc) != wc;
+}
+
+weak int iswupper_l(wint_t wc, locale_t unused locale)
+{
+	return iswupper(wc);
+}