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23 lines
404 B
ArmAsm
23 lines
404 B
ArmAsm
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; Ullrich von Bassewitz, 02.06.1998
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;
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; int toupper (int c);
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;
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.export _toupper
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.import __ctype, __cdiff
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_toupper:
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tay ; Get c into Y
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lda __ctype,y ; Get character classification
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and #$01 ; Mask lower char bit
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beq L1 ; Jump if not lower char
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tya ; Get C back into A
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clc
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adc __cdiff ; make upper case char
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rts ; CC are set
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L1: tya ; Get C back
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rts ; CC are set
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