2.9BSD - /usr/include/unctrl.h

   1: /*
   2:  * unctrl.h
   3:  *
   4:  * 1/26/81 (Berkeley) @(#)unctrl.h	1.1
   5:  */
   6: 
   7: extern char *_unctrl[];
   8: 
   9: # define    unctrl(ch)  (_unctrl[(unsigned) ch])

Defined macros

Usage of this include