| |
| /* |
| FUNCTION |
| <<isupper>>---uppercase character predicate |
| |
| INDEX |
| isupper |
| |
| ANSI_SYNOPSIS |
| #include <ctype.h> |
| int isupper(int <[c]>); |
| |
| TRAD_SYNOPSIS |
| #include <ctype.h> |
| int isupper(<[c]>); |
| |
| DESCRIPTION |
| <<isupper>> is a macro which classifies ASCII integer values by table |
| lookup. It is a predicate returning non-zero for uppercase letters |
| (<<A>>--<<Z>>), 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 isupper>>'. |
| |
| RETURNS |
| <<isupper>> returns non-zero if <[c]> is a uppercase letter (A-Z). |
| |
| PORTABILITY |
| <<isupper>> is ANSI C. |
| |
| No supporting OS subroutines are required. |
| */ |
| #include <_ansi.h> |
| #include <ctype.h> |
| |
| #undef isupper |
| int |
| _DEFUN(isupper,(c),int c) |
| { |
| return ((__ctype_ptr__[c+1] & (_U|_L)) == _U); |
| } |
| |
