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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. It is defined only if <[c]> is representable as an
unsigned char or if <[c]> is EOF.
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'));
}
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