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cc65/libsrc/common/isxdigit.s

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; isxdigit.s
;
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; This file is part of
; cc65 - a freeware C compiler for 6502 based systems
;
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; https://cc65.github.io
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;
; See "LICENSE" file for legal information.
;
; int isxdigit (int c);
;
.export _isxdigit
.include "ctype.inc"
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.import ctype_preprocessor
_isxdigit:
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jsr ctype_preprocessor ; (clears always x)
bcs @L1 ; out of range? (everything already clear -> false)
and #CT_XDIGIT ; mask xdigit bit
@L1: rts