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26 lines
677 B
ArmAsm
26 lines
677 B
ArmAsm
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; 1998-06-02, Ullrich von Bassewitz
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; 2014-09-10, Greg King
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;
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; int ispunct (int c);
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;
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.export _ispunct
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.include "ctype.inc"
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_ispunct:
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cpx #>$0000 ; Char range OK?
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bne @L1 ; Jump if no
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tay
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lda __ctype,y ; Get character classification
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and #CT_NOT_PUNCT ; Mask relevant 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
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rts ; Return NOT (space | control | digit | alpha)
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@L1: lda #<0 ; Return false
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tax
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rts
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