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PC-NET.ASM
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Assembly Source File
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1985-11-06
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5KB
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86 lines
CSEG SEGMENT BYTE PUBLIC 'CODE'
ASSUME CS:CSEG,DS:CSEG,ES:CSEG,SS:CSEG
PUBLIC LPLKIT
PUBLIC LOKIT
PUBLIC UNLOKIT
LOOPLOCK EQU 0
LOCK EQU 1
UNLOCK EQU 2
REQUEST DB ? ; TYPE OF REQUEST
DRIVE DB ? ; INPUT DRIVE NUMBER
LENLOK DW ? ; LENGTH OF LOCK NAME
POINTER DW ? ; POINTER TO LOCK NAME
LOCKNAME DB 64 DUP(?) ; INPUT LOCK NAME
NEWNAME DB '\' ; REBUILT LOCK NAME WITH PATH
CURPATH EQU $ ; CURRENT PATH FOR INPUT DRIVE
DB 64 DUP(?) ; REBUILT LOCK NAME WITH PATH
LENPATH EQU $-CURPATH
LPLKIT PROC FAR
MOV CS:REQUEST,LOOPLOCK
JMP PROCESS
LPLKIT ENDP
LOKIT PROC FAR
MOV CS:REQUEST,LOCK
JMP PROCESS
LOKIT ENDP
UNLOKIT PROC FAR
MOV CS:REQUEST,UNLOCK
PROCESS:
PUSH BP ; SAVE BP
MOV BP,SP ; SAVE SP INTO BP FOR PARM ADDRESSING
PUSH DS ; SAVE BASIC'S DATA SEGMENT
PUSH ES ; SAVE BASIC'S EXTRA SEGMENT
MOV BX,[BP+8] ; GET ADDRESS OF STRING DESCRIPTOR
MOV DX,[BX+2] ; GET ADDRESS OF STRING
MOV CS:POINTER,DX ; SAVE POINTER TO STRING
MOV CX,[BX] ; GET LENGTH OF STRING
MOV CS:LENLOK,CX ; SAVE LENGTH OF THE STRING
MOV BX,[BP+10] ; GET ADDRESS OF DRIVE NUMBER
MOV AL,[BX] ; GET LOW ORDER BYTE OF DRIVE ADDRESS
MOV CS:DRIVE,AL ; SAVE THE DRIVE NUMBER
PUSH CS ; MOV CS TO ES VIA STACK
POP ES ; TARGET IS IN OUR CSEG
MOV SI,DX ; OFFSET OF BASIC'S STRING
MOV DI,OFFSET LOCKNAME; OFFSET OF WORK AREA
CLD ; START FROM THE BOTTOM
REP MOVSB ; COPY BASIC'S STRING TO OUR WORK AREA
PUSH CS ; MOV CS TO DS VIA STACK
POP DS ; OUR CSEG SEGMENT INTO DS
MOV DI,OFFSET CURPATH ; ADDRESS OF AREA TO BLANK
MOV CX,LENPATH ; LENGTH OF AREA TO BLANK
MOV AL,' ' ; A BLANK (NATURALLY)
REP STOSB ; BLANK THE AREA OUT
MOV SI,OFFSET CURPATH ; SET UP FOR CURRENT PATH CALL
MOV AH,47H ; ASK FOR CURRENT PATH
MOV DL,DRIVE ; REQUEST PATH FOR INDICATED DRIVE
INC DL ; 1 ORIGIN FOR PATH CALL
INT 21H ; CALL DOS
MOV DI,OFFSET CURPATH ; START SCAN FOR ZERO BYTE AT START OF PATH
CMP BYTE PTR [DI],0 ; SEE IF WE ARE IN THE BASE DIRECTORY
JE ROOT ; IF [DI]=0 THEN WE ARE IN THE BASE DIR
MOV CX,LENPATH ; ONLY GO FOR LENGTH OF PATH
SUB AL,AL ; SCANNING FOR THE 0 BYTE
REPNE SCASB ; SCAN THE STRING WHILE [DI] <> 00H
DEC DI
MOV BYTE PTR [DI],'\' ; PUT IN THE ENDING '\' BEFORE FILE NAME
INC DI ; DI NOW POINTS TO THE ENDING 0
ROOT:
MOV SI,OFFSET LOCKNAME+2 ; START MOVE AFTER THE ':'
MOV CX,LENLOK ; LENGTH OF STRING
DEC CX ; MINUS 1
DEC CX ; MINUS 1
REP MOVSB ; COPY FILENAME AFTER PATH NAME
MOV DX,OFFSET NEWNAME ; POINT TO NEW NAME
MOV AL,DRIVE ; GET DRIVE FOR LOCK
MOV AH,REQUEST ; RETRIEVE LOCK REQUEST TYPE
INT 67h ; CALL LOCK MANAGER
POP ES ; GET BACK BASIC'S EXTRA SEGMENT
POP DS ; GET BACK BASIC'S DATA SEGMENT
MOV DI,[BP+6] ; GET ADDRESS OF RESULT VARIABLE
MOV [DI],AL ; STORE RETURN CODE FROM LOCK MANAGER
POP BP
RET 6
UNLOKIT ENDP
CSEG ENDS
END