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ISCNTRL(3)             FreeBSD Library Functions Manual             ISCNTRL(3)

NAME
     iscntrl - control character test

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     iscntrl(int c);

DESCRIPTION
     The iscntrl() function tests for any control character.  The value of the
     argument must be 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
     The iscntrl() function returns zero if the character tests false and
     returns non-zero if the character tests true.

COMPATIBILITY
     The 4.4BSD extension of accepting arguments outside of the range of the
     unsigned char type in locales with large character sets is considered
     obsolete and may not be supported in future releases.  The iswcntrl()
     function should be used instead.

SEE ALSO
     ctype(3), iswcntrl(3), ascii(7)

STANDARDS
     The iscntrl() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

FreeBSD 11.0-PRERELEASE          July 17, 2005         FreeBSD 11.0-PRERELEASE

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS

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