libc.info: unctrl

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`unctrl'--translate characters to upper case

*Synopsis*
     #include <unctrl.h>
     char *unctrl(int C);
     int unctrllen(int C);
   *Description*
`unctrl' is a macro which returns the printable representation of C as
a string.  `unctrllen' is a macro which returns the length of the
printable representation of C.
*Returns*
`unctrl' returns a string of the printable representation of C.
   `unctrllen' returns the length of the string which is the printable
representation of C.
*Portability*
`unctrl' and `unctrllen' are not ANSI C.
   No supporting OS subroutines are required.