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cc65/libsrc/common/isxdigit.s
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ArmAsm

;
; Ullrich von Bassewitz, 02.06.1998
;
; int isxdigit (int c);
;
.export _isxdigit
.import __ctype
_isxdigit:
tay
lda __ctype,y ; Get character classification
and #$08 ; Mask xdigit bit
rts