; isspace.s ; ; This file is part of ; cc65 - a freeware C compiler for 6502 based systems ; ; https://cc65.github.io ; ; See "LICENSE" file for legal information. ; ; int isspace (int c); ; .export _isspace .include "ctype.inc" .import ctypemask _isspace: jsr ctypemask ; (always clears X) bcs @L1 ; out of range? (everything already clear -> false) and #(CT_SPACE | CT_OTHER_WS) ; mask space bits @L1: rts