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46 lines
1.1 KiB
ArmAsm
46 lines
1.1 KiB
ArmAsm
;
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; void* memset (void* ptr, int c, size_t n);
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; void* _bzero (void* ptr, size_t n);
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; void bzero (void* ptr, size_t n);
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;
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; Maciej 'YTM/Elysium' Witkowiak, 15.07.2001
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;
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; NOTE: bzero will return it's first argument as memset does. It is no problem
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; to declare the return value as void, since it may be ignored. _bzero
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; (note the leading underscore) is declared with the proper return type,
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; because the compiler will replace memset by _bzero if the fill value
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; is zero, and the optimizer looks at the return type to see if the value
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; in a/x is of any use.
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.export _memset, _bzero, __bzero
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.import popa, popax
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.include "../inc/jumptab.inc"
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.include "../inc/geossym.inc"
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_bzero:
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__bzero:
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sta r0L
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stx r0H
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lda #0
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sta r2L ; fill with zeros
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beq common
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_memset:
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sta r0L
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stx r0H
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jsr popax
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sta r2L
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common: jsr popax
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sta r1L
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pha
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stx r1H
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txa
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pha
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jsr FillRam
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pla ; restore ptr and return it
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tax
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pla
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rts
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