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-rw-r--r--src/ctype/iscntrl.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/ctype/iscntrl.c b/src/ctype/iscntrl.c
new file mode 100644
index 00000000..92ed7f0e
--- /dev/null
+++ b/src/ctype/iscntrl.c
@@ -0,0 +1,6 @@
+#include <ctype.h>
+
+int iscntrl(int c)
+{
+ return (unsigned)c < 0x20 || c == 0x7f;
+}