1 files changed, 26 insertions, 0 deletions
diff --git a/libc/ctype/isdigit.c b/libc/ctype/isdigit.c
new file mode 100644
index 00000000..68cd4eb7
--- /dev/null
+++ b/libc/ctype/isdigit.c
@@ -0,0 +1,26 @@
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ *     IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#include <compiler.h>
+#include <ctype.h>
+
+int __attrconst isdigit(int ch)
+{
+	switch (ch) {
+	 case '0': case '1': case '2': case '3': case '4':
+	 case '5': case '6': case '7': case '8': case '9':
+		return 1;
+	
+	 default:
+		return 0;
+	}
+}