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https://github.com/microsoft/MS-DOS.git
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648 lines
18 KiB
NASM
648 lines
18 KiB
NASM
TITLE MISC - Miscellanious routines for MS-DOS
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NAME MISC
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;
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; Miscellaneous system calls most of which are CAVEAT
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;
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; $SLEAZEFUNC
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; $SLEAZEFUNCDL
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; $GET_INDOS_FLAG
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; $GET_IN_VARS
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; $GET_DEFAULT_DPB
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; $GET_DPB
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; $DISK_RESET
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; $SETDPB
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; $Dup_PDB
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; $CREATE_PROCESS_DATA_BLOCK
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; SETMEM
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;
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.xlist
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;
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; get the appropriate segment definitions
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;
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INCLUDE DOSSEG.ASM
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CODE SEGMENT BYTE PUBLIC 'CODE'
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ASSUME SS:DOSGROUP,CS:DOSGROUP
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.xcref
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INCLUDE DOSSYM.ASM
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INCLUDE DEVSYM.ASM
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.cref
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.list
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ifndef Kanji
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Kanji equ 0
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endif
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ENTRYPOINTSEG EQU 0CH
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MAXDIF EQU 0FFFH
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SAVEXIT EQU 10
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i_need LASTBUFFER,DWORD
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i_need INDOS,BYTE
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i_need SYSINITVAR,BYTE
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i_need CurrentPDB,WORD
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i_need CreatePDB,BYTE
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i_need EXIT_TYPE,BYTE
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i_need EXIT_CODE,WORD
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i_need LASTENT,WORD
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i_need THISDPB,DWORD
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i_need ATTRIB,BYTE
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i_need EXTFCB,BYTE
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i_need DMAADD,DWORD
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i_need DIRSTART,WORD
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i_need CURBUF,DWORD
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i_need USER_SP,WORD
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i_need ENTLAST,WORD
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i_need THISDRV,BYTE
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ASSUME SS:DOSGROUP
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BREAK <SleazeFunc -- get a pointer to media byte>
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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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; C A V E A T P R O G R A M M E R ;
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; ;
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procedure $SLEAZEFUNC,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; None
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; Function:
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; Return Stuff sort of like old get fat call
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; Outputs:
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; DS:BX = Points to FAT ID byte (IBM only)
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; GOD help anyone who tries to do ANYTHING except
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; READ this ONE byte.
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; DX = Total Number of allocation units on disk
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; CX = Sector size
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; AL = Sectors per allocation unit
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; = -1 if bad drive specified
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MOV DL,0
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entry $SLEAZEFUNCDL
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PUSH SS
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POP DS
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ASSUME DS:DOSGROUP
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MOV AL,DL
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invoke GETTHISDRV
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MOV AL,-1
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JC BADSLDRIVE
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invoke FATREAD
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MOV DX,ES:[BP.dpb_max_cluster]
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DEC DX
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MOV AL,ES:[BP.dpb_cluster_mask]
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INC AL
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MOV CX,ES:[BP.dpb_sector_size]
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ADD BP,dpb_media
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BADSLDRIVE:
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invoke get_user_stack
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ASSUME DS:NOTHING
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MOV [SI.user_CX],CX
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MOV [SI.user_DX],DX
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MOV [SI.user_BX],BP
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MOV [SI.user_DS],ES
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return
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$SLEAZEFUNC ENDP
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; ;
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; C A V E A T P R O G R A M M E R ;
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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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BREAK <$ABORT -- Terminate a process>
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procedure $ABORT,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; CS:00 must point to valid program header block
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; Function:
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; Restore terminate and Cntrl-C addresses, flush buffers
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; and transfer to the terminate address
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; Returns:
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; TO THE TERMINATE ADDRESS
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XOR AL,AL
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MOV [exit_type],exit_abort
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;
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; abort_inner must have AL set as the exit code!
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;
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entry abort_inner
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MOV AH,[exit_type]
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MOV [exit_code],AX
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invoke Get_user_stack
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MOV DS,[SI.user_CS] ; set up old interrupts
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XOR AX,AX
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MOV ES,AX
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MOV SI,SAVEXIT
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MOV DI,addr_int_terminate
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MOVSW
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MOVSW
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MOVSW
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MOVSW
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MOVSW
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MOVSW
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transfer reset_environment
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$ABORT ENDP
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BREAK <$Dir_Search_First -- Start a directory search>
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procedure $DIR_SEARCH_FIRST,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:DX Points to unopenned FCB
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; Function:
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; Directory is searched for first matching entry and the directory
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; entry is loaded at the disk transfer address
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; Returns:
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; AL = -1 if no entries matched, otherwise 0
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invoke GETFILE
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ASSUME DS:DOSGROUP
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SAVPLCE:
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; Search-for-next enters here to save place and report
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; findings.
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MOV DL,0 ; Do not XOR!!!
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JC KILLSRCH
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OR AH,AH ; Is it I/O device?
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JS KILLIT ; If so, sign bit will end search
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MOV AX,[LASTENT]
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INC DL
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KILLIT:
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MOV ES:[DI.FILDIRENT],AX
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MOV AX,WORD PTR [THISDPB]
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MOV ES:[DI.fcb_DRVBP],AX
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MOV AX,WORD PTR [THISDPB+2]
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MOV ES:[DI.fcb_DRVBP+2],AX
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MOV AX,[DIRSTART]
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MOV ES:[DI.fcb_DRVBP+4],AX
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; Information in directory entry must be copied into the first
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; 33 bytes starting at the disk transfer address.
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MOV SI,BX
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LES DI,[DMAADD]
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MOV AX,00FFH
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CMP AL,[EXTFCB]
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JNZ NORMFCB
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STOSW
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INC AL
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STOSW
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STOSW
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MOV AL,[ATTRIB]
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STOSB
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NORMFCB:
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MOV AL,[THISDRV]
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INC AL
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STOSB ; Set drive number
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OR DL,DL
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JZ DOSRELATIVE
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MOV DS,WORD PTR [CURBUF+2]
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ASSUME DS:NOTHING
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DOSRELATIVE:
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IF KANJI
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MOVSW
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CMP BYTE PTR ES:[DI-2],5
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JNZ NOTKTRAN
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MOV BYTE PTR ES:[DI-2],0E5H
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NOTKTRAN:
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MOV CX,15
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ELSE
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MOV CX,16
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ENDIF
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REP MOVSW ; Copy 32 bytes of directory entry
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XOR AL,AL
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return
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ASSUME DS:NOTHING
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KILLSRCH1:
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PUSH DS
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POP ES ; Make ES:DI point to the FCB
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KILLSRCH:
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MOV AX,-1
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MOV WORD PTR ES:[DI.FILDIRENT],AX
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return
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$DIR_SEARCH_FIRST ENDP
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BREAK <$Dir_Search_Next -- Find next matching directory entry>
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procedure $DIR_SEARCH_NEXT,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:DX points to unopenned FCB returned by $DIR_SEARCH_FIRST
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; Function:
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; Directory is searched for the next matching entry and the directory
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; entry is loaded at the disk transfer address
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; Returns:
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; AL = -1 if no entries matched, otherwise 0
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invoke MOVNAMENOSET
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ASSUME ES:DOSGROUP
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MOV DI,DX
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JC NEAR PTR KILLSRCH1
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MOV AX,[DI.FILDIRENT]
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LES BP,DWORD PTR [DI.fcb_DRVBP]
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OR AX,AX
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JS NEAR PTR KILLSRCH1
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MOV BX,[DI.fcb_DRVBP+4]
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PUSH DX
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PUSH DS
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PUSH AX
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MOV WORD PTR [THISDPB],BP
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MOV WORD PTR [THISDPB+2],ES
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invoke SetDirSrch
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ASSUME DS:DOSGROUP
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POP AX
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MOV [ENTLAST],-1
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invoke GetEnt
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invoke NextEnt
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POP ES
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ASSUME ES:NOTHING
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POP DI
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JMP SAVPLCE
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$DIR_SEARCH_NEXT ENDP
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BREAK <$Get_FCB_File_Length -- Return size of file in current records>
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procedure $GET_FCB_FILE_LENGTH,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:DX points to unopenned FCB
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; Function:
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; Set random record field to size of file
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; Returns:
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; AL = -1 if no entries matched, otherwise 0
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invoke GETFILE
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ASSUME DS:DOSGROUP
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MOV AL,-1
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retc
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ADD DI,fcb_RR ; Write size in RR field
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MOV CX,WORD PTR ES:[DI.fcb_RECSIZ-fcb_RR]
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OR CX,CX
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JNZ RECOK
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MOV CX,128
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RECOK:
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XOR DX,DX ; Intialize size to zero
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INC SI
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INC SI ; Point to length field
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MOV DS,WORD PTR [CURBUF+2]
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ASSUME DS:NOTHING
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MOV AX,[SI+2] ; Get high word of size
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DIV CX
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PUSH AX ; Save high part of result
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LODSW ; Get low word of size
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DIV CX
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OR DX,DX ; Check for zero remainder
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POP DX
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JZ DEVSIZ
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INC AX ; Round up for partial record
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JNZ DEVSIZ ; Propagate carry?
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INC DX
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DEVSIZ:
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STOSW
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MOV AX,DX
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STOSB
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MOV AL,0
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CMP CX,64
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JAE RET14 ; Only 3-byte field if fcb_RECSIZ >= 64
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MOV ES:[DI],AH
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RET14: return
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$GET_FCB_FILE_LENGTH ENDP
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BREAK <$Get_Fcb_Position -- Set random record field to current position>
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procedure $GET_FCB_POSITION,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:DX points to openned FCB
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; Function:
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; Sets random record field to be same as current record fields
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; Returns:
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; None
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invoke GETREC
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MOV WORD PTR [DI+fcb_RR],AX
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MOV [DI+fcb_RR+2],DL
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CMP [DI.fcb_RECSIZ],64
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JAE RET16
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MOV [DI+fcb_RR+2+1],DH ; Set 4th byte only if record size < 64
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RET16: return
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$GET_FCB_POSITION ENDP
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BREAK <$Disk_Reset -- Flush out all dirty buffers>
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procedure $DISK_RESET,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; None
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; Function:
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; Flush and invalidate all buffers
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; Returns:
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; Nothing
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PUSH SS
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POP DS
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ASSUME DS:DOSGROUP
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MOV AL,-1
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invoke FLUSHBUF
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MOV WORD PTR [LASTBUFFER+2],-1
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MOV WORD PTR [LASTBUFFER],-1
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invoke SETVISIT
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ASSUME DS:NOTHING
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NBFFR: ; Free ALL buffers
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MOV [DI.VISIT],1 ; Mark as visited
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CMP BYTE PTR [DI.BUFDRV],-1
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JZ SKPBF ; Save a call to PLACEBUF
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MOV WORD PTR [DI.BUFDRV],00FFH
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invoke SCANPLACE
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SKPBF:
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invoke SKIPVISIT
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JNZ NBFFR
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return
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$DISK_RESET ENDP
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procedure $RAW_CON_IO,NEAR ; System call 6
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DL = -1 if input
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; else DL is output character
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; Function:
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; Input or output raw character from console, no echo
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; Returns:
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; AL = character
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MOV AL,DL
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CMP AL,-1
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JNZ RAWOUT
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LES DI,DWORD PTR [user_SP] ; Get pointer to register save area
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XOR BX,BX
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invoke GET_IO_FCB
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retc
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MOV AH,1
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invoke IOFUNC
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JNZ RESFLG
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invoke SPOOLINT
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OR BYTE PTR ES:[DI.user_F],40H ; Set user's zero flag
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XOR AL,AL
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return
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RESFLG:
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AND BYTE PTR ES:[DI.user_F],0FFH-40H ; Reset user's zero flag
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RILP:
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invoke SPOOLINT
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entry $RAW_CON_INPUT ; System call 7
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; Inputs:
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; None
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; Function:
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; Input raw character from console, no echo
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; Returns:
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; AL = character
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XOR BX,BX
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invoke GET_IO_FCB
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retc
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MOV AH,1
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invoke IOFUNC
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JZ RILP
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XOR AH,AH
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invoke IOFUNC
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return
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;
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; Output the character in AL to stdout
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;
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entry RAWOUT
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PUSH BX
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MOV BX,1
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invoke GET_IO_FCB
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JC RAWRET1
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TEST [SI.fcb_DEVID],080H ; output to file?
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JZ RAWNORM ; if so, do normally
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PUSH DS
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PUSH SI
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LDS SI,DWORD PTR [SI.fcb_FIRCLUS] ; output to special?
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TEST BYTE PTR [SI+SDEVATT],ISSPEC
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POP SI
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POP DS
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JZ RAWNORM ; if not, do normally
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INT int_fastcon ; quickly output the char
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JMP SHORT RAWRET
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RAWNORM:
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CALL RAWOUT3
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RAWRET: CLC
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RAWRET1:
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POP BX
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return
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;
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; Output the character in AL to handle in BX
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;
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entry RAWOUT2
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invoke GET_IO_FCB
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retc
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RAWOUT3:
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PUSH AX
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JMP SHORT RAWOSTRT
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ROLP:
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invoke SPOOLINT
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RAWOSTRT:
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MOV AH,3
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CALL IOFUNC
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JZ ROLP
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POP AX
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MOV AH,2
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CALL IOFUNC
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CLC ; Clear carry indicating successful
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return
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$RAW_CON_IO ENDP
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ASSUME DS:NOTHING,ES:NOTHING
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; This routine is called at DOS init
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procedure OUTMES,NEAR ; String output for internal messages
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LODS CS:BYTE PTR [SI]
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CMP AL,"$"
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retz
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invoke OUT
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JMP SHORT OUTMES
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return
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OutMes ENDP
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ASSUME SS:DOSGROUP
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BREAK <$Parse_File_Descriptor -- Parse an arbitrary string into an FCB>
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procedure $PARSE_FILE_DESCRIPTOR,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:SI Points to a command line
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; ES:DI Points to an empty FCB
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; Bit 0 of AL = 1 At most one leading separator scanned off
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; = 0 Parse stops if separator encountered
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; Bit 1 of AL = 1 If drive field blank in command line - leave FCB
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; = 0 " " " " " " - put 0 in FCB
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; Bit 2 of AL = 1 If filename field blank - leave FCB
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; = 0 " " " - put blanks in FCB
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; Bit 3 of AL = 1 If extension field blank - leave FCB
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; = 0 " " " - put blanks in FCB
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; Function:
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; Parse command line into FCB
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; Returns:
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; AL = 1 if '*' or '?' in filename or extension, 0 otherwise
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; DS:SI points to first character after filename
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invoke MAKEFCB
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PUSH SI
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invoke get_user_stack
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POP [SI.user_SI]
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return
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$PARSE_FILE_DESCRIPTOR ENDP
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BREAK <$Create_Process_Data_Block,SetMem -- Set up process data block>
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;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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; C A V E A T P R O G R A M M E R ;
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; ;
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procedure $Dup_PDB,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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MOV BYTE PTR [CreatePDB], 0FFH ; indicate a new process
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$Dup_PDB ENDP
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procedure $CREATE_PROCESS_DATA_BLOCK,NEAR
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ASSUME DS:NOTHING,ES:NOTHING,SS:NOTHING
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; Inputs:
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; DX = Segment number of new base
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; Function:
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; Set up program base and copy term and ^C from int area
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; Returns:
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; None
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; Called at DOS init
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MOV ES,DX
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TEST BYTE PTR [CreatePDB],0FFh
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JZ create_PDB_old
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MOV DS,[CurrentPDB]
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JMP SHORT Create_copy
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Create_PDB_old:
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invoke get_user_stack
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MOV DS,[SI.user_CS]
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Create_copy:
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XOR SI,SI ; copy all 80h bytes
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MOV DI,SI
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MOV CX,80H
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REP MOVSW
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TEST BYTE PTR [CreatePDB],0FFh ; Shall we create a process?
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JZ Create_PDB_cont ; nope, old style call
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;
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; Here we set up for a new process...
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;
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PUSH CS
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POP DS
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ASSUME DS:DOSGROUP
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XOR BX,BX ; dup all jfns
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MOV CX,FilPerProc
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Create_dup_jfn:
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PUSH ES ; save new PDB
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invoke get_jfn_pointer ; ES:DI is jfn
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JC create_skip ; not a valid jfn
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PUSH ES ; save him
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PUSH DI
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invoke get_sf_from_jfn ; get sf pointer
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||
JC create_no_inc
|
||
INC ES:[DI].sf_ref_count ; new fh
|
||
|
||
create_no_inc:
|
||
POP DI
|
||
POP ES ; get old jfn
|
||
MOV AL,ES:[DI] ; get sfn
|
||
POP ES
|
||
PUSH ES
|
||
MOV AL,ES:[BX] ; copy into new place!
|
||
|
||
create_skip:
|
||
POP ES
|
||
INC BX ; next jfn...
|
||
LOOP create_dup_jfn
|
||
|
||
PUSH [CurrentPDB] ; get current process
|
||
POP BX
|
||
PUSH BX
|
||
POP ES:[PDB_Parent_PID] ; stash in child
|
||
MOV [CurrentPDB],ES
|
||
ASSUME DS:NOTHING
|
||
MOV DS,BX
|
||
;
|
||
; end of new process create
|
||
;
|
||
Create_PDB_cont:
|
||
MOV BYTE PTR [CreatePDB],0h ; reset flag
|
||
MOV AX,DS:[2] ; set up size for fall through
|
||
|
||
entry SETMEM
|
||
ASSUME DS:NOTHING,ES:NOTHING,SS:NOTHING
|
||
|
||
; Inputs:
|
||
; AX = Size of memory in paragraphs
|
||
; DX = Segment
|
||
; Function:
|
||
; Completely prepares a program base at the
|
||
; specified segment.
|
||
; Called at DOS init
|
||
; Outputs:
|
||
; DS = DX
|
||
; ES = DX
|
||
; [0] has INT int_abort
|
||
; [2] = First unavailable segment ([ENDMEM])
|
||
; [5] to [9] form a long call to the entry point
|
||
; [10] to [13] have exit address (from int_terminate)
|
||
; [14] to [17] have ctrl-C exit address (from int_ctrl_c)
|
||
; [18] to [21] have fatal error address (from int_fatal_abort)
|
||
; DX,BP unchanged. All other registers destroyed.
|
||
|
||
XOR CX,CX
|
||
MOV DS,CX
|
||
MOV ES,DX
|
||
MOV SI,addr_int_terminate
|
||
MOV DI,SAVEXIT
|
||
MOV CX,6
|
||
REP MOVSW
|
||
MOV ES:[2],AX
|
||
SUB AX,DX
|
||
CMP AX,MAXDIF
|
||
JBE HAVDIF
|
||
MOV AX,MAXDIF
|
||
HAVDIF:
|
||
MOV BX,ENTRYPOINTSEG
|
||
SUB BX,AX
|
||
MOV CL,4
|
||
SHL AX,CL
|
||
MOV DS,DX
|
||
MOV WORD PTR DS:[PDB_CPM_Call+1],AX
|
||
MOV WORD PTR DS:[PDB_CPM_Call+3],BX
|
||
MOV DS:[PDB_Exit_Call],(int_abort SHL 8) + mi_INT
|
||
MOV BYTE PTR DS:[PDB_CPM_Call],mi_Long_CALL
|
||
MOV WORD PTR DS:[PDB_Call_System],(int_command SHL 8) + mi_INT
|
||
MOV BYTE PTR DS:[PDB_Call_System+2],mi_Long_RET
|
||
return
|
||
|
||
$CREATE_PROCESS_DATA_BLOCK ENDP
|
||
do_ext
|
||
|
||
CODE ENDS
|
||
END
|
||
|