ctype size optimization

libsrc/common/isgraph.s

@@ -1,25 +1,25 @@
+; isgraph.s
 ;
-; 1998-06-02, Ullrich von Bassewitz
-; 2014-09-10, Greg King
+; This file is part of
+; cc65 - a freeware C compiler for 6502 based systems
+;
+; https://github.com/cc65/cc65
+;
+; See "LICENSE" file for legal information.
 ;
 ; int isgraph (int c);
 ;
 
         .export         _isgraph
         .include        "ctype.inc"
+        .import         ctype_preprocessor
 
 _isgraph:
-        cpx     #>$0000         ; Char range OK?
-        bne     @L1             ; Jump if no
-        tay
-        lda     __ctype,y       ; Get character classification
-        and     #CT_CTRL_SPACE  ; Mask character bits
-        cmp     #1              ; If false, then set "borrow" flag
+        jsr     ctype_preprocessor      ; (clears always x)
+        bcs     @L1                     ; out of range? (everything already clear -> false)
+        and     #CT_CTRL_SPACE  		; mask character bits
+        cmp     #1             			; if false, then set "borrow" flag
         lda     #0
-        sbc     #0              ; Invert logic
-        rts                     ; Return NOT control and NOT space
-
-@L1:    lda     #<0             ; Return false
-        tax
-        rts
+        sbc     #0              		; invert logic (return NOT control and NOT space)
+@L1:    rts