isprint.c from Gdb at Krugle
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/*
FUNCTION
<<isprint>>, <<isgraph>>---printable character predicates
INDEX
isprint
INDEX
isgraph
ANSI_SYNOPSIS
#include <ctype.h>
int isprint(int <[c]>);
int isgraph(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int isprint(<[c]>);
int isgraph(<[c]>);
DESCRIPTION
<<isprint>> is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for printable
characters, and 0 for other character arguments.
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 either macro using `<<#undef isprint>>' or `<<#undef isgraph>>'.
RETURNS
<<isprint>> returns non-zero if <[c]> is a printing character,
(<<0x20>>--<<0x7E>>).
<<isgraph>> behaves identically to <<isprint>>, except that the space
character (<<0x20>>) is excluded.
PORTABILITY
<<isprint>> and <<isgraph>> are ANSI C.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef isgraph
int
_DEFUN(isgraph,(c),int c)
{
return((_ctype_ + 1)[c] & (_P|_U|_L|_N));
}
#undef isprint
int
_DEFUN(isprint,(c),int c)
{
return((_ctype_ + 1)[c] & (_P|_U|_L|_N|_B));
}
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