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/*

FUNCTION

        <<isblank>>---blank character predicate

INDEX

        isblank

ANSI_SYNOPSIS

        #include <ctype.h>

        int isblank(int <[c]>);

TRAD_SYNOPSIS

        #include <ctype.h>

        int isblank(<[c]>);

DESCRIPTION

<<isblank>> is a function which classifies ASCII integer values by table

lookup.  It is a predicate returning non-zero for blank characters, and 0

for other characters.

RETURNS

<<isblank>> returns non-zero if <[c]> is a blank character.

PORTABILITY

<<isblank>> is C99.

No supporting OS subroutines are required.

*/

#include <_ansi.h>

#include <ctype.h>

#undef isblank

int

_DEFUN(isblank,(c),int c)

{

        return ((__ctype_ptr__[c+1] & _B) || (c == '\t'));

}