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home | helpISCNTRL(3) BSD 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. RETURN VALUES The iscntrl() function returns zero if the character tests false and returns non-zero if the character tests true. SEE ALSO ctype(3), isalnum(3), isalpha(3), isascii(3), isblank(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7) STANDARDS The iscntrl() function conforms to ANSI X3.159-1989 ("ANSI C89"). CAVEATS The argument to iscntrl() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details. BSD April 17, 2008 BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS | CAVEATS