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-rw-r--r--src/ctype/iswupper.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/ctype/iswupper.c b/src/ctype/iswupper.c
new file mode 100644
index 00000000..eae59a75
--- /dev/null
+++ b/src/ctype/iswupper.c
@@ -0,0 +1,6 @@
+#include <wctype.h>
+
+int iswupper(wint_t wc)
+{
+ return towlower(wc) != wc;
+}