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/*
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
isblank (int c)
{
return ((__CTYPE_PTR[c+1] & _B) || (c == '\t'));
}
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