1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)iscntrl.3 5.1 (Berkeley) 05/02/91 7.\" 8.Dd 9.Dt ISCNTRL 3 10.Os 11.Sh NAME 12.Nm iscntrl 13.Nd control character test 14.Sh SYNOPSIS 15.Fd #include <ctype.h> 16.Ft int 17.Fn iscntrl "int c" 18.Sh DESCRIPTION 19The 20.Fn iscntrl 21function tests for any control character. 22.Sh RETURN VALUES 23The 24.Fn iscntrl 25macro returns zero if the character tests false and 26returns non-zero if the character tests true. 27.Sh SEE ALSO 28.Xr isascii 3 , 29.Xr isalnum 3 , 30.Xr isalpha 3 , 31.Xr isdigit 3 , 32.Xr isgraph 3 , 33.Xr islower 3 , 34.Xr isprint 3 , 35.Xr ispunct 3 , 36.Xr isspace 3 , 37.Xr isupper 3 , 38.Xr isxdigit 3 , 39.Xr toascii 3 , 40.Xr tolower 3 , 41.Xr toupper 3 , 42.Xr stdio 3 43.Xr ascii 7 44.Sh STANDARDS 45The 46.Fn iscntrl 47function conforms to 48.St -ansiC . 49