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96 lines
3.9 KiB
Plaintext
96 lines
3.9 KiB
Plaintext
;
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; File: TFSRFN3.a
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;
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; Contains: This file contains file system utility routines which
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; use the volume block map.
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;
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; Copyright: © 1982-1991 by Apple Computer, Inc., all rights reserved.
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;
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; Change History (most recent first):
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;
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; <2> 9/12/91 JSM Add a header.
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; <1.1> 11/10/88 CCH Fixed Header.
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; <1.0> 11/9/88 CCH Adding to EASE.
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; <1.0> 2/11/88 BBM Adding file for the first time into EASE…
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; 1/14/86 LAK Changed interface (FileAlloc sets up D0 option first so
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; AllocContig entrypoint is no longer needed).
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; 1/14/86 LAK Changed interface (FileAlloc sets up D0 option first so
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; AllocContig entrypoint is no longer needed).
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; 10/1/85 LAK Minor cleanup. Removed Lg2Phys (only called by Cache).
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; 8/29/85 BB Added support for contiguous allocation (AllocContig)
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; 6/19/85 PWD Changed non-hardware internal errors to FSDSIntErr instead of
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; IOErr.
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; 4/25/85 PWD Changed to convert all internal errors to IOErr.
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; 3/10/85 GJC All new for TFS - old is now part of MFS compatibility routines
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; 3/10/85 GJC Added TFS functionality.
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; 8/18/83 LAK Fixed same bug again (3 more to go).
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; 8/15/83 LAK Fixed bug in block allocation (last free block bug).
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; 1/17/83 LAK Changes for alloc blks offset from diskette start.
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; 1/17/83 LAK Changed for final volume format (alloc blks offset)
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; 12/23/82 LAK Added incr, decr of volume free block count in DAlBlks, Alloc;
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; mark volume dirty in these routines instead of SubMrk.
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; 12/22/82 LAK Rewrote to reflect new file system data structures; No
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; reclamation of space is now needed from undeleted files; always
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; checks number of free bytes available on the volume before
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; proceeding; now has 2 entry points.
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;
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;_______________________________________________________________________
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;
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; External Routines:
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;
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;
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; Internal Routines: GtNxBlk,Alloc,DAlBlks,SubMrk
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;
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;_______________________________________________________________________
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;_______________________________________________________________________
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;
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; Routine: Alloc,AllocContig
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; (c) 1983 Apple Computer Inc.
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;
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; Arguments: A2.L (input) -- VCB ptr
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; (A1,D1.W) (input) -- FCB pointer
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; D4.L (input) -- number of bytes extra to allocate
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; D0.W (output) -- Error code, 0 if no error.
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; (only FXM error: dskfull - other errors can
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; be passed up by VSM or BT)
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; D6.L (output) -- number of bytes actually allocated (always
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; a multiple of 512-bytes).
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; All other registers are preserved
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; Called By: FileWrite,SetEOF,FileAlloc
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; Calls: GtNxBlk,SubMrk
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; Function: Allocate new blocks to a file. (Does not check lock bits!)
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; Alloc entry point does nothing if it can't get all the bytes
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; requested.
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;
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; Modification History:
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; 22 Dec 82 LAK Rewrote to reflect new file system data structures;
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; No reclamation of space is now needed from undeleted
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; files; always checks number of free bytes available
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; on the volume before proceeding; now has 2 entry points.
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; 17 Jan 83 LAK Changes for alloc blks offset from diskette start.
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; 10 Mar 85 GJC Added TFS functionality.
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; <14Jan86> LAK Changed interface (FileAlloc sets up D0 option first so
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; AllocContig entrypoint is no longer needed).
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;_______________________________________________________________________
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BLANKS ON
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STRING ASIS
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Alloc BSR TFSVolTst ; is it TFS or is it MFS
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BNE MFSAlloc ; MFS - then go handle it
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MOVEQ #kEFAll,D0 ; get it all or give up (doesn't <14Jan86>
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; to be contiguous)
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AllocTFS MOVE.L (SP)+,-(A6) ; save return address <14Jan86>
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MOVE.L D3,-(A6) ; save D3 <14Jan86>
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MOVE.W D0,D3 ; pass options in D3 <14Jan86>
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JSR Extendfile ; get the space
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MOVE.L (A6)+,D3 ; restore D3 <29Aug85>
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MOVE.L (A6)+,-(SP) ; Restore return address
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TST.W D0 ; Set condition codes
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RTS
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