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25 lines
707 B
ArmAsm
25 lines
707 B
ArmAsm
; isgraph.s
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;
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; This file is part of
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; cc65 - a freeware C compiler for 6502 based systems
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;
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; https://cc65.github.io
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;
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; See "LICENSE" file for legal information.
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;
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; int isgraph (int c);
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;
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.export _isgraph
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.include "ctype.inc"
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.import ctypemask
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_isgraph:
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jsr ctypemask ; (always clears X)
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bcs @L1 ; out of range? (everything already clear -> false)
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and #CT_CTRL_SPACE ; mask character bits
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cmp #1 ; if false, then set "borrow" flag
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lda #0
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sbc #0 ; invert logic (return NOT control and NOT space)
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@L1: rts
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