mirror of
https://github.com/microsoft/MS-DOS.git
synced 2024-11-29 17:15:47 +00:00
513 lines
13 KiB
NASM
513 lines
13 KiB
NASM
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;
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; FCB management routines for MSDOS
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;
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INCLUDE DOSSEG.ASM
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IFNDEF KANJI
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KANJI EQU 0 ;FALSE
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ENDIF
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CODE SEGMENT BYTE PUBLIC 'CODE'
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ASSUME SS:DOSGROUP,CS:DOSGROUP
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.xlist
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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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i_need Name1,BYTE
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i_need NumIO,BYTE
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i_need DevFCB,BYTE
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i_need Creating,BYTE
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i_need ExtFCB,BYTE
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i_need Attrib,BYTE
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i_need SpaceFlag,BYTE
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i_need Current_Country,WORD
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procedure MakeFcb,NEAR
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DRVBIT EQU 2
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NAMBIT EQU 4
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EXTBIT EQU 8
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MOV BYTE PTR [SpaceFlag],0
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XOR DL,DL ; Flag--not ambiguous file name
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TEST AL,DRVBIT ; Use current drive field if default?
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JNZ DEFDRV
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MOV BYTE PTR ES:[DI],0 ; No - use default drive
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DEFDRV:
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INC DI
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MOV CX,8
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TEST AL,NAMBIT ; Use current name fields as defualt?
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XCHG AX,BX ; Save bits in BX
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MOV AL," "
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JZ FILLB ; If not, go fill with blanks
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ADD DI,CX
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XOR CX,CX ; Don't fill any
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FILLB:
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REP STOSB
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MOV CL,3
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TEST BL,EXTBIT ; Use current extension as default
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JZ FILLB2
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ADD DI,CX
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XOR CX,CX
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FILLB2:
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REP STOSB
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XCHG AX,CX ; Put zero in AX
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STOSW
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STOSW ; Initialize two words after to zero
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SUB DI,16 ; Point back at start
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TEST BL,1 ; Scan off separators if not zero
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JZ SKPSPC
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CALL SCANB ; Peel off blanks and tabs
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CALL DELIM ; Is it a one-time-only delimiter?
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JNZ NOSCAN
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INC SI ; Skip over the delimiter
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SKPSPC:
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CALL SCANB ; Always kill preceding blanks and tabs
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NOSCAN:
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CALL GETLET
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JBE NODRV ; Quit if termination character
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CMP BYTE PTR[SI],":" ; Check for potential drive specifier
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JNZ NODRV
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INC SI ; Skip over colon
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SUB AL,"@" ; Convert drive letter to binary drive number
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JBE BADDRV ; Valid drive numbers are <= NUMIO
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CMP AL,BYTE PTR [NUMIO]
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JBE HAVDRV
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BADDRV:
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MOV DL,-1
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HAVDRV:
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STOSB ; Put drive specifier in first byte
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INC SI
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DEC DI ; Counteract next two instructions
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NODRV:
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DEC SI ; Back up
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INC DI ; Skip drive byte
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NORMSCAN:
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MOV CX,8
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CALL GETWORD ; Get 8-letter file name
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CMP BYTE PTR [SI],"."
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JNZ NODOT
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INC SI ; Skip over dot if present
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MOV CX,3 ; Get 3-letter extension
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CALL MUSTGETWORD
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NODOT:
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MOV AL,DL
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return
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NONAM:
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ADD DI,CX
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DEC SI
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return
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GETWORD:
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CALL GETLET
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JBE NONAM ; Exit if invalid character
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DEC SI
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;
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; UGH!!! Horrible bug here that should be fixed at some point:
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; If the name we are scanning is longer than CX, we keep on reading!
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;
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MUSTGETWORD:
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CALL GETLET
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;
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; If spaceFlag is set then we allow spaces in a pathname
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;
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JB FILLNAM
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JNZ MustCheckCX
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TEST BYTE PTR [SpaceFlag],0FFh
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JZ FILLNAM
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CMP AL," "
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JNZ FILLNAM
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MustCheckCX:
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JCXZ MUSTGETWORD
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DEC CX
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CMP AL,"*" ; Check for ambiguous file specifier
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JNZ NOSTAR
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MOV AL,"?"
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REP STOSB
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NOSTAR:
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STOSB
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IF KANJI
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CALL TESTKANJ
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JZ NOTDUAL3
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JCXZ BNDERR ; Attempt to straddle boundry
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MOVSB ; Transfer second byte
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DEC CX
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JMP SHORT NOTDUAL3
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BNDERR:
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MOV BYTE PTR ES:[DI-1]," " ; patch up that space
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JMP MustGetWord ; go back and scan until delim
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NOTDUAL3:
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ENDIF
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CMP AL,"?"
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JNZ MUSTGETWORD
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OR DL,1 ; Flag ambiguous file name
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JMP MUSTGETWORD
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FILLNAM:
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MOV AL," "
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REP STOSB
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DEC SI
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return
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SCANB:
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LODSB
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CALL SPCHK
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JZ SCANB
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DEC SI
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return
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MakeFCB ENDP
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;
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; NameTrans is used by FindPath to scan off an element
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; of a path. We must allow spaces in pathnames
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; Inputs: SS - DOSGROUP
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; DS:SI name
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; Outputs: DS:SI advanced over spot
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; ES:DI point to after Name1
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; registers modified: AX, BX, CX, DX
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procedure NameTrans,near
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MOV BYTE PTR [SpaceFlag],1
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PUSH SS
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POP ES
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MOV DI,OFFSET DOSGROUP:NAME1
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PUSH DI
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MOV AL,' '
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MOV CX,11
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REP STOSB
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XOR AL,AL
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MOV DL,AL
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STOSB
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POP DI
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CMP BYTE PTR [SI],'.'
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IF KANJI
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JZ FOOBAR
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CALL NORMSCAN
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CMP [NAME1],0E5H
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retnz
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MOV [NAME1],5
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return
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FOOBAR:
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ELSE
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JNZ NORMSCAN
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ENDIF
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MOVSB
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LODSB
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CALL PATHCHRCMP
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JZ GOTDOTNAME
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OR AL,AL
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JZ GOTDOTNAME
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CMP AL,'.'
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JNZ BADDOTS
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STOSB
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LODSB
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CALL PATHCHRCMP
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JZ GOTDOTNAME
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OR AL,AL
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JZ GOTDOTNAME
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DEC SI
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BADDOTS:
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DEC SI
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GOTDOTNAME:
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DEC SI
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XOR AL,AL
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return
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nametrans ENDP
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SUBTTL BUILDFCB -- MAKE A BLANK FCB FOR A DEVICE
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PAGE
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procedure BuildFCB,near
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ASSUME DS:DOSGROUP,ES:DOSGROUP
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; Function:
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; Build a blank FCB for I/O to a device
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; Outputs:
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; Same as GETNAME
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MOV AX," "
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MOV DI,OFFSET DOSGROUP:DEVFCB+8 ; Point to extent field
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STOSW
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STOSB ; Blank out extent field
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XOR AX,AX
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MOV CX,10
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REP STOSW ; Fill FCB with zeros
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STOSB
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invoke DATE16
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MOV DI,OFFSET DOSGROUP:DEVFCB+22
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XCHG AX,DX
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STOSW
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XCHG AX,DX
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STOSW
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XCHG AX,BX ; But device number in AH
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MOV BX,OFFSET DOSGROUP:DEVFCB
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MOV SI,DI
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XOR AL,AL ; Set zero, clear carry
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return
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BuildFCB ENDP
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SUBTTL MOVENAME, LODNAME -- EXAMINE FCB AND SETUP
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PAGE
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procedure FCB_move,NEAR
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entry MOVNAMENOSET
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MOV DI,1
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JMP SHORT MOVSTART
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entry MOVNAME
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS, DX point to FCB or extended FCB
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; Outputs:
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; DS:DX point to normal FCB
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; DS:SI point after end of NAME/EXT in FCB
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; ES = DOSGROUP
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; If file name OK:
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; [NAME1] has name in upper case
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; All registers destroyed
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; Carry set if bad file name or drive
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XOR DI,DI
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MOVSTART:
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MOV WORD PTR [CREATING],0E500H ; Not creating, not DEL *.*
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MOV SI,DX
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LODSB
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MOV [EXTFCB],AL ; Set flag if extended FCB in use
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XOR AH,AH ; Set default attributes
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CMP AL,-1 ; Is it an extended FCB?
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JNZ HAVATTRB
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ADD DX,7 ; Adjust to point to normal FCB
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ADD SI,6
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MOV AH,[SI-1] ; Attribute byte
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LODSB ; Get drive select byte
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HAVATTRB:
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invoke GETTHISDRV
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retc
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PUSH DS
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PUSH DX
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PUSH SI
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PUSH AX
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;
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; DS:DX is pointer to good FCB
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; DS:SI is same
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;
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; Move the file into Name1 and UCASE it
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;
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PUSH DI
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context ES
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MOV DI,OFFSET DOSGROUP:NAME1
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CALL LodName
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POP DI
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JC DrvNoSet
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;
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; are we setting current dir info?
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;
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OR DI,DI
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JNZ DrvNoSet ; do not set dir info
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;
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; check for device name first, eliminating drive hits on devices
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;
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context DS
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invoke DEVNAME
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JNC DrvNoSet ; we have a device
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;
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; make sure that everything is current
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;
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invoke FATREAD
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ASSUME DS:NOTHING,ES:NOTHING
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MOV BYTE PTR [ATTRIB],attr_directory+attr_hidden+attr_system
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invoke GETCURRDIR
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DrvNoSet:
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POP AX
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MOV BYTE PTR [ATTRIB],AH
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POP SI
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POP DX
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POP DS
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context ES
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MOV DI,OFFSET DOSGROUP:NAME1
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entry LODNAME
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; Inputs: DS:SI point to an FCB
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; ES:DI point to an FCB
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; Outputs: DS:SI point to after FCB
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; ES:DI point to after FCB
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; FCB from DS:SI copied and ucased to ES:DI
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; Carry set if there was an error.
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; Destroys AX,CX
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CMP BYTE PTR [SI]," " ; Don't allow blank as first letter
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STC ; In case of error
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retz
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IF KANJI
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MOV CX,8
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CMP BYTE PTR [SI],0E5H
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JNZ MOVCHK
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INC SI
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MOV AL,5
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STOSB
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MOVSB
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MOV CX,6
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MOVCHK:
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CALL GETLET
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JB RET6
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JNZ STOLET ; Is it a delimiter?
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CMP AL," " ; This is the only delimiter allowed
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STC ; In case of error
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JNZ RET6
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STOLET:
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STOSB
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CALL TESTKANJ
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JZ MOVLP ;No
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LODSB ;Get second byte
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DEC CX
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JZ BOUNDERR ;Attempt to cross boundry
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STOSB
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MOVLP:
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LOOP MOVCHK
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MOV CX,3
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MOVCHK2:
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CALL GETLET
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JB RET6
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JNZ STOLET2 ; Is it a delimiter?
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CMP AL," " ; This is the only delimiter allowed
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STC ; In case of error
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retnz
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STOLET2:
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STOSB
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CALL TESTKANJ
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JZ MOVLP2 ;No
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LODSB ;Get second byte
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DEC CX
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JNZ DOSTORE
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BOUNDERR: ;Attempt to cross boundry
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STC
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return
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DOSTORE:
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STOSB
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MOVLP2:
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LOOP MOVCHK2
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ELSE
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MOV CX,11
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MOVCHK:
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CALL GETLET
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JB RET6
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JNZ STOLET ; Is it a delimiter?
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CMP AL," " ; This is the only delimiter allowed
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STC ; In case of error
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retnz
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STOLET:
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STOSB
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LOOP MOVCHK
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ENDIF
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CLC ; Got through whole name - no error
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RET6: return
|
||
|
|
FCB_Move ENDP
|
||
|
|
|
||
|
|
SUBTTL GETLET, DELIM -- CHECK CHARACTERS AND CONVERT
|
||
|
|
PAGE
|
||
|
|
procedure GetLet,NEAR
|
||
|
|
; Get a byte from [SI], convert it to upper case, and compare for delimiter.
|
||
|
|
; ZF set if a delimiter, CY set if a control character (other than TAB).
|
||
|
|
LODSB
|
||
|
|
|
||
|
|
CMP AL,"a"
|
||
|
|
JB CHK1
|
||
|
|
CMP AL,"z"
|
||
|
|
JA CHK1
|
||
|
|
SUB AL,20H ; Convert to upper case
|
||
|
|
CHK1:
|
||
|
|
PUSH SI
|
||
|
|
MOV SI,[Current_Country]
|
||
|
|
ADD SI,Map_call
|
||
|
|
PUSH CS ; CS for long return
|
||
|
|
CALL WORD PTR CS:[SI]
|
||
|
|
POP SI
|
||
|
|
entry CHK
|
||
|
|
CMP AL,"."
|
||
|
|
retz
|
||
|
|
CMP AL,'"'
|
||
|
|
retz
|
||
|
|
CALL PATHCHRCMP
|
||
|
|
retz
|
||
|
|
CMP AL,"["
|
||
|
|
retz
|
||
|
|
CMP AL,"]"
|
||
|
|
retz
|
||
|
|
|
||
|
|
DELIM:
|
||
|
|
CMP AL,":" ; Allow ":" as separator in IBM version
|
||
|
|
retz
|
||
|
|
|
||
|
|
CMP AL,"<"
|
||
|
|
retz
|
||
|
|
CMP AL,"|"
|
||
|
|
retz
|
||
|
|
CMP AL,">"
|
||
|
|
retz
|
||
|
|
|
||
|
|
CMP AL,"+"
|
||
|
|
retz
|
||
|
|
CMP AL,"="
|
||
|
|
retz
|
||
|
|
CMP AL,";"
|
||
|
|
retz
|
||
|
|
CMP AL,","
|
||
|
|
retz
|
||
|
|
SPCHK:
|
||
|
|
CMP AL,9 ; Filter out tabs too
|
||
|
|
retz
|
||
|
|
; WARNING! " " MUST be the last compare
|
||
|
|
CMP AL," "
|
||
|
|
return
|
||
|
|
GetLet ENDP
|
||
|
|
|
||
|
|
procedure PATHCHRCMP,NEAR
|
||
|
|
CMP AL,'/'
|
||
|
|
retz
|
||
|
|
CMP AL,'\'
|
||
|
|
return
|
||
|
|
PathChrCMP ENDP
|
||
|
|
|
||
|
|
IF KANJI
|
||
|
|
procedure TESTKANJ,NEAR
|
||
|
|
CMP AL,81H
|
||
|
|
JB NOTLEAD
|
||
|
|
CMP AL,9FH
|
||
|
|
JBE ISLEAD
|
||
|
|
CMP AL,0E0H
|
||
|
|
JB NOTLEAD
|
||
|
|
CMP AL,0FCH
|
||
|
|
JBE ISLEAD
|
||
|
|
NOTLEAD:
|
||
|
|
PUSH AX
|
||
|
|
XOR AX,AX ;Set zero
|
||
|
|
POP AX
|
||
|
|
return
|
||
|
|
|
||
|
|
ISLEAD:
|
||
|
|
PUSH AX
|
||
|
|
XOR AX,AX ;Set zero
|
||
|
|
INC AX ;Reset zero
|
||
|
|
POP AX
|
||
|
|
return
|
||
|
|
TESTKANJ ENDP
|
||
|
|
ENDIF
|
||
|
|
do_ext
|
||
|
|
|
||
|
|
CODE ENDS
|
||
|
|
END
|