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23 lines
422 B
ArmAsm
23 lines
422 B
ArmAsm
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; Ullrich von Bassewitz, 02.06.1998
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; int tolower (int c);
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;
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.export _tolower
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.import __ctype, __cdiff
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_tolower:
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tay ; Get C into Y
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lda __ctype,y ; Get character classification
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and #$02 ; Is this an upper case char?
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beq L1 ; Jump if no
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tya ; Get char back into A
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sec
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sbc __cdiff ; make lower case char
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rts ; CC are set
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L1: tya ; Get char back into A
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rts ; CC are set
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