ispunct.c from Gdb at Krugle
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/*
FUNCTION
<<ispunct>>---punctuation character predicate
INDEX
ispunct
ANSI_SYNOPSIS
#include <ctype.h>
int ispunct(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int ispunct(<[c]>);
DESCRIPTION
<<ispunct>> is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for printable
punctuation 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 ispunct>>'.
RETURNS
<<ispunct>> returns non-zero if <[c]> is a printable punctuation character
(<<isgraph(<[c]>) && !isalnum(<[c]>)>>).
PORTABILITY
<<ispunct>> is ANSI C.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef ispunct
int
_DEFUN(ispunct,(c),int c)
{
return((_ctype_ + 1)[c] & _P);
}
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