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-rw-r--r--src/ctype/iswdigit.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/ctype/iswdigit.c b/src/ctype/iswdigit.c
new file mode 100644
index 00000000..0487145f
--- /dev/null
+++ b/src/ctype/iswdigit.c
@@ -0,0 +1,9 @@
+#include <wchar.h>
+#include <wctype.h>
+
+#undef iswdigit
+
+int iswdigit(wint_t wc)
+{
+ return (unsigned)wc-'0' < 10;
+}