ISBLANK(3)                OpenBSD Programmer's Manual               ISBLANK(3)

NAME
     isblank - blank-space character test

SYNOPSIS
     #include <ctype.h>

     int
     isblank(int c);

DESCRIPTION
     The isblank() function tests for the standard blank-space characters.
     The standard blank-space characters are the following:

           ` '    Space character.
           \t     Horizontal tab.

     In the C locale, isblank() returns true only for the standard blank-space
     characters.

RETURN VALUES
     The isblank() macro returns zero if the character tests false or non-zero
     if the character tests true.

SEE ALSO
     isalnum(3), isalpha(3), isascii(3), iscntrl(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)

CAVEATS
     The argument to isblank() must be EOF or representable as an unsigned
     char; otherwise, the result is undefined.

OpenBSD 4.9                      May 31, 2007                      OpenBSD 4.9