ISCNTRL(3) BSD Programmer's Manual ISCNTRL(3) NNAAMMEE iissccnnttrrll - control character test SSYYNNOOPPSSIISS ##iinncclluuddee <<ccttyyppee..hh>> _i_n_t iissccnnttrrll(_i_n_t _c); DDEESSCCRRIIPPTTIIOONN The iissccnnttrrll() 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 RREETTUURRNN VVAALLUUEESS The iissccnnttrrll() function returns zero if the character tests false and re- turns non-zero if the character tests true. SSEEEE AALLSSOO ctype(3), ascii(7) SSTTAANNDDAARRDDSS The iissccnnttrrll() function conforms to ANSI C X3.159-1989 (``ANSI C ''). 4.4BSD June 4, 1993 1