/*
FUNCTION
	<<isblank>>, <<isblank_l>>---blank character predicate

INDEX
	isblank

INDEX
	isblank_l

SYNOPSIS
	#include <ctype.h>
	int isblank(int <[c]>);

	#include <ctype.h>
	int isblank_l(int <[c]>, locale_t <[locale]>);

DESCRIPTION
<<isblank>> is a function which classifies singlebyte charset 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.

<<isblank_l>> is like <<isblank>> but performs the check based on the
locale specified by the locale object locale.  If <[locale]> is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.

RETURNS
<<isblank>>, <<isblank_l>> return non-zero if <[c]> is a blank character.

PORTABILITY
<<isblank>> is C99.
<<isblank_l>> is POSIX-1.2008.

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'));
}
