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[cc65] / libsrc / common / isxdigit.s
1 ;
2 ; Ullrich von Bassewitz, 02.06.1998
3 ;
4 ; int isxdigit (int c);
5 ;
6
7         .export         _isxdigit
8         .import         __ctype
9
10 _isxdigit:
11         cpx     #$00            ; Char range ok?
12         bne     @L1             ; Jump if no
13         tay
14         lda     __ctype,y       ; Get character classification
15         and     #$08            ; Mask xdigit bit
16         rts
17
18 @L1:    lda     #$00            ; Return false
19         tax
20         rts
21