1 files changed, 26 insertions, 0 deletions
diff --git a/lib/libncurses/lib_unctrl.c b/lib/libncurses/lib_unctrl.c
new file mode 100644
index 000000000000..3c8f5831fb60
--- /dev/null
+++ b/lib/libncurses/lib_unctrl.c
@@ -0,0 +1,26 @@
+#include <ctype.h>
+#include <unctrl.h>
+
+char *
+ unctrl(register unsigned char uch)
+{
+    static char buffer[3] = "^x";
+
+    if (isgraph(uch)) {
+	/*
+	 * Printable character. Simply return the character as a one-character
+	 * string.
+	 */
+	buffer[1] = uch;
+	return &buffer[1];
+    }
+    uch &= ~0x80;
+    /*
+     * It is a control character. DEL is handled specially (^?). All others
+     * use ^x notation, where x is the character code for the control character
+     * with 0x40 ORed in. (Control-A becomes ^A etc.).
+     */ buffer[1] = (uch == 0x7F ? '?' : (uch | 0x40));
+
+    return buffer;
+
+}