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ISCNTRL(3)               BSD Library Functions Manual               ISCNTRL(3)

     iscntrl -- control character test

     Standard C Library (libc, -lc)

     #include <ctype.h>

     iscntrl(int c);

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

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

     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.

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

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

BSD                             August 21, 2004                            BSD