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22 lines
317 B
ArmAsm
22 lines
317 B
ArmAsm
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; Ullrich von Bassewitz, 02.06.1998
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;
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; int isdigit (int c);
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;
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.export _isdigit
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.include "ctype.inc"
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_isdigit:
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cpx #$00 ; 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_DIGIT ; Mask digit bit
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rts
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@L1: lda #$00 ; Return false
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tax
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rts
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