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64 lines
1.3 KiB
ArmAsm
64 lines
1.3 KiB
ArmAsm
;
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; Oliver Schmidt, 2012-09-10
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;
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; char* __fastcall__ getdevicedir (unsigned char device, char* buf, size_t size);
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;
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.export _getdevicedir
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.import diskinit, devicestr, fnunit
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.import popa, popax
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.importzp ptr2, ptr3
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.include "errno.inc"
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;------------------------------------------------------------------------------
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; _getdevicedir
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.proc _getdevicedir
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; Save size
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sta ptr3
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stx ptr3+1
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; Save buf
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jsr popax
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sta ptr2
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stx ptr2+1
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; Check device readiness
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jsr popa
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jsr diskinit
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beq size
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jsr __mappederrno
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bne fail ; Branch always
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; Check for sufficient buf size
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size: lda ptr3+1
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bne okay ; Buf >= 256
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lda ptr3
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cmp #3
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bcs okay ; Buf >= 3
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lda #<ERANGE
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jsr __directerrno
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fail: lda #0 ; Return NULL
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tax
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rts
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; Copy device string representation into buf
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okay: lda fnunit ; Set by diskinit
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jsr devicestr ; Returns 0 in A
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sta __oserror ; Clear _oserror
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; Success, return buf
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lda ptr2
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ldx ptr2+1
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rts
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.endproc
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