; ; Ullrich von Bassewitz, 02.06.1998 ; ; int isalnum (int c); ; .export _isalnum .include "ctype.inc" _isalnum: cpx #$00 ; Char range ok? bne @L1 ; Jump if no tay lda __ctype,y ; Get character classification and #CT_ALNUM ; Mask character/digit bits rts @L1: lda #$00 ; Return false tax rts
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