1 files changed, 8 insertions, 0 deletions
diff --git a/lib/libc/ctype/isdigit.c b/lib/libc/ctype/isdigit.c
new file mode 100644
index 00000000..445e1cdc
--- /dev/null
+++ b/lib/libc/ctype/isdigit.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isdigit(int c)
+{
+	return (unsigned)c - '0' < 10;
+}
+
+weak_reference(isdigit, isdigit_l);