iscntrl man page on 4.4BSD

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ISCNTRL(3)		 BSD Library Functions Manual		    ISCNTRL(3)

     iscntrl — control character test

     #include <ctype.h>

     iscntrl(int c);;

     The iscntrl() function tests for any control character.  In the ASCII
     character set, this includes the following characters:

     000 nul	   001 soh	 002 stx       003 etx	     004 eot
     005 enq	   006 ack	 007 bel       010 bs	     011 ht
     012 nl	   013 vt	 014 np	       015 cr	     016 so
     017 si	   020 dle	 021 dc1       022 dc2	     023 dc3
     024 dc4	   025 nak	 026 syn       027 etb	     030 can
     031 em	   032 sub	 033 esc       034 fs	     035 gs
     036 rs	   037 us	 177 del

     The iscntrl() function returns zero if the character tests false and
     returns non-zero if the character tests true.

     ctype(3), ascii(7)

     The iscntrl() function conforms to ANSI X3.159-1989 (“ANSI C89”).

BSD				 June 4, 1993				   BSD

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