1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" %sccs.include.redist.man% 9.\" 10.\" @(#)iscntrl.3 5.2 (Berkeley) 06/29/91 11.\" 12.Dd 13.Dt ISCNTRL 3 14.Os 15.Sh NAME 16.Nm iscntrl 17.Nd control character test 18.Sh SYNOPSIS 19.Fd #include <ctype.h> 20.Ft int 21.Fn iscntrl "int c" 22.Sh DESCRIPTION 23The 24.Fn iscntrl 25function tests for any control character. 26.Sh RETURN VALUES 27The 28.Fn iscntrl 29macro returns zero if the character tests false and 30returns non-zero if the character tests true. 31.Sh SEE ALSO 32.Xr isascii 3 , 33.Xr isalnum 3 , 34.Xr isalpha 3 , 35.Xr isdigit 3 , 36.Xr isgraph 3 , 37.Xr islower 3 , 38.Xr isprint 3 , 39.Xr ispunct 3 , 40.Xr isspace 3 , 41.Xr isupper 3 , 42.Xr isxdigit 3 , 43.Xr toascii 3 , 44.Xr tolower 3 , 45.Xr toupper 3 , 46.Xr stdio 3 47.Xr ascii 7 48.Sh STANDARDS 49The 50.Fn iscntrl 51function conforms to 52.St -ansiC . 53