mirror of
https://github.com/elliotnunn/supermario.git
synced 2024-11-22 04:31:30 +00:00
156 lines
5.1 KiB
Plaintext
156 lines
5.1 KiB
Plaintext
;
|
|
; File: BTIntf.a
|
|
;
|
|
; Copyright: © 1990-1992 by Apple Computer, Inc. All rights reserved.
|
|
;
|
|
; Change History (most recent first):
|
|
;
|
|
; <SM2> 11/3/92 SWC Changed INCLUDEs to a LOAD of StandardEqu.d.
|
|
; <2> 4/11/90 S To make ioBTKCProc zeroed out as per Kenny Tung.
|
|
;
|
|
|
|
|
|
BLANKS ON
|
|
STRING ASIS
|
|
|
|
PRINT OFF
|
|
LOAD 'StandardEqu.d'
|
|
INCLUDE 'BTreeEqu.a'
|
|
PRINT ON
|
|
PRINT NOGEN
|
|
|
|
;________________________________________________________________________________
|
|
;
|
|
; Routine: OpenUGBT
|
|
;
|
|
; Function: Open a file for B*-Tree access.
|
|
;
|
|
; This function will also update the B*-Tree's key descriptor if the
|
|
; B*-Tree doesn't have one yet.
|
|
;
|
|
; Pascal interface:
|
|
; Function OpenUGBT(VRefNum: Integer;
|
|
; DirID: LongInt;
|
|
; fileName: Str255;
|
|
; OpenMode: Integer;
|
|
; VAR BTRefNum: Integer): OSErr;
|
|
;________________________________________________________________________________
|
|
;
|
|
OpenUGBT PROC EXPORT
|
|
LINK A6,#-BTParamSize ; Allocate an HFS parameter block
|
|
;
|
|
; At this point the stack looks as follows:
|
|
;
|
|
; -BTParamSize(A6) --> Start of I/O parameter block.
|
|
; (A6) --> Old A6
|
|
; 4(A6) --> Return address
|
|
; 8(A6) --> Address of BTRefNum (to be returned)
|
|
; 12(A6) --> Open Mode
|
|
; 14(A6) --> Filename string
|
|
; 18(A6) --> DirID
|
|
; 22(A6) --> Volume RefNum
|
|
; 24(A6) --> Return value storage (2 bytes)
|
|
;
|
|
BTRefNum EQU 8 ; Address of BTRefNum (to be returned)
|
|
BTOpenMode EQU 12 ; File open mode
|
|
BTNamePtr EQU 14 ; Filename string
|
|
BTDirID EQU 18 ; DirID
|
|
BTVRefNum EQU 22 ; Volume RefNum
|
|
Result EQU 24 ; Return value storage (2 bytes)
|
|
ArgSize EQU Result-8 ; Size of argument block on stack (28 bytes)
|
|
|
|
MOVE.L BTRefNum(A6),A1 ; Point to BTRefNum
|
|
CLR.W (A1) ; Zero it out (in case of errors)
|
|
|
|
@0 LEA -BTParamSize(A6),A0 ; Point to parameter block
|
|
MOVE.W #(BTParamSize/2)-1,D0 ; DBRA word loop index
|
|
@1 CLR.W (A0)+ ; ...cleared.
|
|
DBRA D0,@1
|
|
|
|
LEA -BTParamSize(A6),A0 ; Point to parameter block
|
|
MOVE.W BTVRefNum(A6),ioVRefNum(A0) ; Set up VRefNum
|
|
MOVE.L BTDirID(A6),ioDirID(A0) ; ... DirID,
|
|
MOVE.L BTNamePtr(A6),ioFileName(A0) ; ... and Filename pointer
|
|
; [ioFileType and ioOwnBuf are clear ]
|
|
MOVE.B BTOpenMode+1(A6),ioPermssn(A0) ; Request R/W permission
|
|
MOVE.L #0, ioBTKCProc(A0) ; Clear this field as per Kenny Tung Sangam 4/11/90
|
|
_BTOpen
|
|
BEQ.S @50 ; Continue if no error
|
|
CMP.W #btNoKDErr,D0 ; No key descriptor?
|
|
BNE.S @50 ; If other error, give up
|
|
LEA UGKD,A1 ; Point to key descriptor
|
|
MOVE.L A1,ioBTKDPtr(A0) ; Set up pointer to KD
|
|
CLR.L ioBTKDReqCount(A0) ; Clear top 3 bytes of KD length
|
|
MOVE.B (A1),ioBTKDReqCount+3(A0) ; Copy length of KD record
|
|
_BTUpdateKD ; Try to update the key descriptor
|
|
BEQ.S @0 ; If successful, retry _BTOpen call
|
|
|
|
@50 MOVE.W D0,Result(A6) ; Set up to pass error on to user
|
|
BNE.S @95 ; Punt if anything goes wrong
|
|
|
|
MOVEA.L BTRefNum(A6),A1 ; Point to BTRefNum storage
|
|
MOVE.W ioRefNum(A0),(A1) ; Return refNum for opened file.
|
|
|
|
@95 UNLK A6 ; Release local storage
|
|
MOVE.L (SP)+,A0 ; Save return address
|
|
ADDA.W #ArgSize,SP ; Remove arguments
|
|
JMP (A0) ; And return
|
|
|
|
DC.B ($80+'O') ; Indicate start of procedure name
|
|
DC.B 'PENUGBT' ; (for use by debugger)
|
|
DC.W 0
|
|
|
|
UGKD: DC.B 7 ; Key descriptor length = 7
|
|
DC.B $00, $01 ; Skip 1 byte
|
|
DC.B $06, $01 ; 1 unsigned longword
|
|
DC.B $03, $01, $00 ; 1 Pascal string, not case sens, not diac. sens.
|
|
ENDP
|
|
;________________________________________________________________________________
|
|
;
|
|
; Routine: BldFSKey
|
|
;
|
|
; Function: Build a File-System B*-Tree key
|
|
;
|
|
; Pascal interface:
|
|
; Procedure BldFSKey(keyDirID: LongInt; keyCName: Str31; keyBufPtr: BTKeyPtr);
|
|
;________________________________________________________________________________
|
|
;
|
|
BldFSKey PROC EXPORT
|
|
LINK A6,#0 ; LINK for debugging trail
|
|
;
|
|
; At this point the stack looks as follows:
|
|
;
|
|
; (A6) --> Old A6
|
|
; 4(A6) --> Return address
|
|
; 8(A6) --> Key buffer pointer
|
|
; 12(A6) --> CName pointer
|
|
; 16(A6) --> DirID
|
|
;
|
|
MOVEA.L 8(A6),A1 ; Point to key to be built
|
|
MOVEA.L 12(A6),A0 ; Point to CName string
|
|
MOVEQ #0,D0 ; Clear top 3 bytes
|
|
MOVE.B (A0),D0 ; Pick up CName length
|
|
; Add in: key filler (1)
|
|
; DirID (4)
|
|
; String length byte (1)
|
|
; ----------------------
|
|
ADDQ.L #6,D0 ; 6 bytes
|
|
MOVE.B D0,(A1)+ ; ...which gives the total key length
|
|
CLR.B (A1)+ ; leave a filler
|
|
MOVE.L 16(A6),(A1)+; Move in DirID
|
|
SUBQ.L #5,D0 ; Get back length of actual CName string
|
|
_BlockMove ; Move in the CName string
|
|
|
|
UNLK A6 ; Pop off call frame
|
|
MOVE.L (SP)+,A0 ; Save return address
|
|
ADD.W #12,SP ; Pop incoming arguments, leaving result
|
|
JMP (A0) ; And return to the caller
|
|
|
|
DC.B ($80+'B') ; Indicate start of procedure name
|
|
DC.B 'LDFSKEY' ; (for use by debugger)
|
|
DC.W 0
|
|
ENDP
|
|
|
|
END
|
|
|