| |
| /* |
| 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 if <[c]> is representable as an unsigned char or if |
| <[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_ptr__[c+1] & (_P|_U|_L|_N)); |
| } |
| |
| |
| #undef isprint |
| int |
| _DEFUN(isprint,(c),int c) |
| { |
| return(__ctype_ptr__[c+1] & (_P|_U|_L|_N|_B)); |
| } |
| |
