NAME    [Toc]    [Back]

     iscntrl -- control character test

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     iscntrl(int c);

DESCRIPTION    [Toc]    [Back]

     The iscntrl() function tests for any control character.  For single C
     chars locales (see multibyte(3)) the value of the argument is representable
 as an unsigned char or the value of EOF.	In the ASCII character
     set, this includes the following characters (with their numeric values
     shown in octal):

     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

RETURN VALUES    [Toc]    [Back]

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

COMPATIBILITY    [Toc]    [Back]

     Although iscntrl() accepts arguments outside of the range of the unsigned
     char type in locales with large character sets, this is a 4.4BSD extension
 and the iwcntrl() function should be used instead for maximum portability.

SEE ALSO    [Toc]    [Back]

     ctype(3), iswcntrl(3), multibyte(3), ascii(7)

STANDARDS    [Toc]    [Back]

     The iscntrl() function conforms to ISO/IEC 9899:1990 (``ISO C89'').


FreeBSD 5.2.1			October 6, 2002 		 FreeBSD 5.2.1