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https://github.com/microsoft/MS-DOS.git
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507 lines
14 KiB
NASM
507 lines
14 KiB
NASM
TITLE DIRCALL - Directory manipulation internal calls
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NAME DIRCALL
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; $MKDIR
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; $CHDIR
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; $RMDIR
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.xlist
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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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i_need AUXSTACK,BYTE
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i_need NoSetDir,BYTE
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i_need CURBUF, DWORD
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i_need DIRSTART,WORD
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i_need THISDPB,DWORD
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i_need NAME1,BYTE
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i_need LASTENT,WORD
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i_need ATTRIB,BYTE
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i_need THISFCB,DWORD
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i_need AUXSTACK,BYTE
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i_need CREATING,BYTE
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i_need DRIVESPEC,BYTE
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i_need ROOTSTART,BYTE
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i_need SWITCH_CHARACTER,BYTE
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extrn sys_ret_ok:near,sys_ret_err:near
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; XENIX CALLS
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BREAK <$MkDir - Make a directory entry>
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MKNERRJ: JMP MKNERR
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NODEEXISTSJ: JMP NODEEXISTS
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procedure $MKDIR,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:DX Points to asciz name
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; Function:
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; Make a new directory
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; Returns:
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; STD XENIX Return
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; AX = mkdir_path_not_found if path bad
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; AX = mkdir_access_denied If
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; Directory cannot be created
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; Node already exists
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; Device name given
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; Disk or directory(root) full
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invoke validate_path
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JC MKNERRJ
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MOV SI,DX
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MOV WORD PTR [THISFCB+2],SS
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MOV WORD PTR [THISFCB],OFFSET DOSGROUP:AUXSTACK-40 ; Scratch space
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MOV AL,attr_directory
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MOV WORD PTR [CREATING],0E500h
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invoke MAKENODE
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ASSUME DS:DOSGROUP
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MOV AL,mkdir_path_not_found
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JC MKNERRJ
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JNZ NODEEXISTSJ
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LDS DI,[CURBUF]
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ASSUME DS:NOTHING
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SUB SI,DI
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PUSH SI ; Pointer to fcb_FIRCLUS
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PUSH [DI.BUFSECNO] ; Sector of new node
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PUSH SS
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POP DS
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ASSUME DS:DOSGROUP
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PUSH [DIRSTART] ; Parent for .. entry
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XOR AX,AX
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MOV [DIRSTART],AX ; Null directory
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invoke NEWDIR
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JC NODEEXISTSPOPDEL ; No room
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invoke GETENT ; First entry
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LES DI,[CURBUF]
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MOV ES:[DI.BUFDIRTY],1
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ADD DI,BUFINSIZ ; Point at buffer
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MOV AX,202EH ; ". "
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STOSW
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MOV DX,[DIRSTART] ; Point at itself
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invoke SETDOTENT
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MOV AX,2E2EH ; ".."
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STOSW
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POP DX ; Parent
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invoke SETDOTENT
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LES BP,[THISDPB]
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POP DX ; Entry sector
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XOR AL,AL ; Pre read
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invoke GETBUFFR
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MOV DX,[DIRSTART]
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LDS DI,[CURBUF]
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ASSUME DS:NOTHING
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ZAPENT:
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POP SI ; fcb_Firclus pointer
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ADD SI,DI
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MOV [SI],DX
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XOR DX,DX
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MOV [SI+2],DX
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MOV [SI+4],DX
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DIRUP:
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MOV [DI.BUFDIRTY],1
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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,ES:[BP.dpb_drive]
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invoke FLUSHBUF
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SYS_RET_OKJ:
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JMP SYS_RET_OK
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NODEEXISTSPOPDEL:
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POP DX ; Parent
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POP DX ; Entry sector
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LES BP,[THISDPB]
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XOR AL,AL ; Pre read
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invoke GETBUFFR
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LDS DI,[CURBUF]
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ASSUME DS:NOTHING
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POP SI ; dir_first pointer
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ADD SI,DI
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SUB SI,dir_first ; Point back to start of dir entry
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MOV BYTE PTR [SI],0E5H ; Free the entry
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CALL DIRUP
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NODEEXISTS:
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MOV AL,mkdir_access_denied
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MKNERR:
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JMP SYS_RET_ERR
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$MKDIR ENDP
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BREAK <$ChDir -- Change current directory on a drive>
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procedure $CHDIR,NEAR
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:DX Points to asciz name
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; Function:
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; Change current directory
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; Returns:
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; STD XENIX Return
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; AX = chdir_path_not_found if error
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invoke validate_path
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JC PathTooLong
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PUSH DS
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PUSH DX
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MOV SI,DX
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invoke GETPATH
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JC PATHNOGOOD
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JNZ PATHNOGOOD
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ASSUME DS:DOSGROUP
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MOV AX,[DIRSTART]
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MOV BX,AX
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XCHG BX,ES:[BP.dpb_current_dir]
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OR AX,AX
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POP SI
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POP DS
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ASSUME DS:NOTHING
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JZ SYS_RET_OKJ
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MOV DI,BP
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ADD DI,dpb_dir_text
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MOV DX,DI
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CMP [DRIVESPEC],0
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JZ NODRIVESPEC
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INC SI
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INC SI
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NODRIVESPEC:
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MOV CX,SI
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CMP [ROOTSTART],0
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JZ NOTROOTPATH
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INC SI
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INC CX
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JMP SHORT COPYTHESTRINGBXZ
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NOTROOTPATH:
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OR BX,BX ; Previous path root?
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JZ COPYTHESTRING ; Yes
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XOR BX,BX
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ENDLOOP:
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CMP BYTE PTR ES:[DI],0
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JZ PATHEND
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INC DI
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INC BX
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JMP SHORT ENDLOOP
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PATHEND:
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MOV AL,'/'
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CMP AL,[switch_character]
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JNZ SLASHOK
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MOV AL,'\' ; Use the alternate character
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SLASHOK:
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STOSB
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INC BX
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JMP SHORT CHECK_LEN
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PATHNOGOOD:
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POP AX
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POP AX
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PATHTOOLONG:
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error error_path_not_found
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ASSUME DS:NOTHING
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INCBXCHK:
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INC BX
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BXCHK:
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CMP BX,DIRSTRLEN
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return
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COPYTHESTRINGBXZ:
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XOR BX,BX
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COPYTHESTRING:
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LODSB
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OR AL,AL
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JNZ FOOB
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JMP CPSTDONE
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FOOB:
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CMP AL,'.'
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JZ SEEDOT
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CALL COPYELEM
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CHECK_LEN:
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CMP BX,DIRSTRLEN
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JB COPYTHESTRING
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MOV AL,ES:[DI-1]
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invoke PATHCHRCMP
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JNZ OK_DI
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DEC DI
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OK_DI:
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XOR AL,AL
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STOSB ; Correctly terminate the path
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MOV ES:[BP.dpb_current_dir],-1 ; Force re-validation
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JMP SHORT PATHTOOLONG
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SEEDOT:
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LODSB
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OR AL,AL ; Check for null
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JZ CPSTDONEDEC
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CMP AL,'.'
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JNZ COPYTHESTRING ; eat ./
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CALL DELELMES ; have ..
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LODSB ; eat the /
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OR AL,AL ; Check for null
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JZ CPSTDONEDEC
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JMP SHORT COPYTHESTRING
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; Copy one element from DS:SI to ES:DI include trailing / not trailing null
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; LODSB has already been done
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COPYELEM:
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PUSH DI ; Save in case too long
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PUSH CX
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MOV CX,800h ; length of filename
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MOV AH,'.' ; char to stop on
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CALL CopyPiece ; go for it!
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CALL BXCHK ; did we go over?
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JAE POPCXDI ; yep, go home
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CMP AH,AL ; did we stop on .?
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JZ CopyExt ; yes, go copy ext
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OR AL,AL ; did we end on nul?
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JZ DECSIRet ; yes, bye
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CopyPathEnd:
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STOSB ; save the path char
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CALL INCBXCHK ; was there room for it?
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JAE POPCXDI ; Nope
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INC SI ; guard against following dec
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DECSIRET:
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DEC SI ; point back at null
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POP CX
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POP AX ; toss away saved DI
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return
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POPCXDI:
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POP CX ; restore
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POP DI ; point back...
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return
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CopyExt:
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STOSB ; save the dot
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CALL INCBXCHK ; room?
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JAE POPCXDI ; nope.
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LODSB ; get next char
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XOR AH,AH ; NUL here
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MOV CX,300h ; at most 3 chars
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CALL CopyPiece ; go copy it
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CALL BXCHK ; did we go over
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JAE POPCXDI ; yep
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OR AL,AL ; sucessful end?
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JZ DECSIRET ; yes
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JMP CopyPathEnd ; go stash path char
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DELELMES:
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; Delete one path element from ES:DI
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DEC DI ; the '/'
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DEC BX
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IF KANJI
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PUSH AX
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PUSH CX
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PUSH DI
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PUSH DX
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MOV CX,DI
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MOV DI,DX
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DELLOOP:
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CMP DI,CX
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JZ GOTDELE
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MOV AL,ES:[DI]
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INC DI
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invoke TESTKANJ
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JZ NOTKANJ11
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INC DI
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JMP DELLOOP
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NOTKANJ11:
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invoke PATHCHRCMP
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JNZ DELLOOP
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MOV DX,DI ; Point to char after '/'
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JMP DELLOOP
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GOTDELE:
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MOV DI,DX
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POP DX
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POP AX ; Initial DI
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SUB AX,DI ; Distance moved
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SUB BX,AX ; Set correct BX
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POP CX
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POP AX
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return
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ELSE
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DELLOOP:
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CMP DI,DX
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retz
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PUSH AX
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MOV AL,ES:[DI-1]
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invoke PATHCHRCMP
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POP AX
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retz
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DEC DI
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DEC BX
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JMP SHORT DELLOOP
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ENDIF
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CPSTDONEDEC:
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DEC DI ; Back up over trailing /
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CPSTDONE:
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STOSB ; The NUL
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JMP SYS_RET_OK
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; copy a piece CH chars max until the char in AH (or path or NUL)
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CopyPiece:
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STOSB ; store the character
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INC CL ; moved a byte
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CALL INCBXCHK ; room enough?
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JAE CopyPieceRet ; no, pop CX and DI
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OR AL,AL ; end of string?
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JZ CopyPieceRet ; yes, dec si and return
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IF KANJI
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CALL TestKanj ; was it kanji?
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JZ NotKanj ; nope
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MOVSB ; move the next byte
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CALL INCBXCHK ; room for it?
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JAE CopyPieceRet ; nope
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INC CL ; moved a byte
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NotKanj:
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ENDIF
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CMP CL,CH ; move too many?
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JBE CopyPieceNext ; nope
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IF KANJI
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CALL TestKanj ; was the last byte kanji
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JZ NotKanj2 ; no only single byte backup
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DEC DI ; back up a char
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DEC BX
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NotKanj2:
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ENDIF
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DEC DI ; back up a char
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DEC BX
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CopyPieceNext:
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LODSB ; get next character
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invoke PathChrCmp ; end of road?
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JZ CopyPieceRet ; yep, return and don't dec SI
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CMP AL,AH ; end of filename?
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JNZ CopyPiece ; go do name
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CopyPieceRet:
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return ; bye!
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$CHDIR ENDP
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BREAK <$RmDir -- Remove a directory>
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NOPATHJ: JMP NOPATH
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procedure $RMDIR,NEAR ; System call 47
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ASSUME DS:NOTHING,ES:NOTHING
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; Inputs:
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; DS:DX Points to asciz name
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; Function:
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; Delete directory if empty
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; Returns:
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; STD XENIX Return
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; AX = rmdir_path_not_found If path bad
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; AX = rmdir_access_denied If
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; Directory not empty
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; Path not directory
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; Root directory specified
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; Directory malformed (. and .. not first two entries)
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; AX = rmdir_current_directory
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invoke Validate_path
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JC NoPathJ
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MOV SI,DX
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invoke GETPATH
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JC NOPATHJ
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ASSUME DS:DOSGROUP
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JNZ NOTDIRPATH
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MOV DI,[DIRSTART]
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OR DI,DI
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JZ NOTDIRPATH
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MOV CX,ES:[BP.dpb_current_dir]
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CMP CX,-1
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JNZ rmdir_current_dir_check
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invoke GetCurrDir
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invoke Get_user_stack
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MOV DX,[SI.user_DX]
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MOV DS,[SI.user_DS]
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JMP $RMDIR
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NOTDIRPATHPOP:
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POP AX
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POP AX
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NOTDIRPATH:
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error error_access_denied
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rmdir_current_dir_check:
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CMP DI,CX
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JNZ rmdir_get_buf
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error error_current_directory
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rmdir_get_buf:
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LDS DI,[CURBUF]
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ASSUME DS:NOTHING
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SUB BX,DI
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PUSH BX ; Save entry pointer
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PUSH [DI.BUFSECNO] ; Save sector number
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PUSH SS
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POP DS
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ASSUME DS:DOSGROUP
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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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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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STOSB
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invoke STARTSRCH
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invoke GETENTRY
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MOV DS,WORD PTR [CURBUF+2]
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ASSUME DS:NOTHING
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MOV SI,BX
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LODSW
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CMP AX,(' ' SHL 8) OR '.'
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JNZ NOTDIRPATHPOP
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ADD SI,32-2
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LODSW
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CMP AX,('.' SHL 8) OR '.'
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JNZ NOTDIRPATHPOP
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PUSH SS
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POP DS
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ASSUME DS:DOSGROUP
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MOV [LASTENT],2 ; Skip . and ..
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invoke GETENTRY
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MOV [ATTRIB],attr_directory+attr_hidden+attr_system
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invoke SRCH
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JNC NOTDIRPATHPOP
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LES BP,[THISDPB]
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MOV BX,[DIRSTART]
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invoke RELEASE
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POP DX
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XOR AL,AL
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invoke GETBUFFR
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LDS DI,[CURBUF]
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ASSUME DS:NOTHING
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POP BX
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ADD BX,DI
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MOV BYTE PTR [BX],0E5H ; Free the entry
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JMP DIRUP
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NOPATH:
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error error_path_not_found
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$RMDIR ENDP
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do_ext
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CODE ENDS
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END
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