isspace.c from Gdb at Krugle
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/*
FUNCTION
<<isspace>>---whitespace character predicate
INDEX
isspace
ANSI_SYNOPSIS
#include <ctype.h>
int isspace(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int isspace(<[c]>);
DESCRIPTION
<<isspace>> is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for whitespace
characters, and 0 for other characters. It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using `<<#undef isspace>>'.
RETURNS
<<isspace>> returns non-zero if <[c]> is a space, tab, carriage return, new
line, vertical tab, or formfeed (<<0x09>>--<<0x0D>>, <<0x20>>).
PORTABILITY
<<isspace>> is ANSI C.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef isspace
int
_DEFUN(isspace,(c),int c)
{
return((_ctype_ + 1)[c] & _S);
}
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