; ; Ullrich von Bassewitz, 02.06.1998 ; ; int isblank (int c); ; ; cc65 (and GNU) extension. ; .export _isblank .include "ctype.inc" _isblank: cpx #$00 ; Char range ok? bne @L1 ; Jump if no tay lda __ctype,y ; Get character classification and #CT_SPACE_TAB ; Mask blank bit rts @L1: lda #$00 ; Return false tax rts