;
;	DIRFIX.ASM as of 6/4/80
;	by Keith Petersen, W8SDZ
;
;This program is for use on CP/M 1.4, CDOS or IMDOS.
;Its purpose is to fix directory entries made under
;CP/M 2.x or other operating systems which use bit
;7 of the file name for attributes, thus making the
;file unreadable.
;
;The program prints  out the disk directory
;on the signed on drive. If an illegal ASCII
;character is found in the filename or filetype
;it will be stored in a table of names to be renamed
;when the printing is finished.
;
BDOS	EQU	05H
FCB	EQU	5CH
FCBEXT	EQU	FCB+12
FCB2	EQU	FCB+16
FCBEXT2	EQU	FCB2+12
TBUFF	EQU	80H
;
	ORG	100H
;
;	PROGRAM BEGINS HERE
;
BEGIN:	LXI	SP,STACK
	LXI	H,RENFIL
	SHLD	RENPTR	;INITIALIZE RENAME POINTER
	CALL	SEARCH	;SEARCH FOR FIRST FILE
;
MAIN02:	LDA	RESULT
	CPI	0FFH	;NO FILE?
	JZ	MAIN04	;NO FILE, EXIT LOOP
	CALL	WORKLOOP
	CALL	NEXTFILE ;SEARCH FOR NEXT FILE
	JMP	MAIN02
;
MAIN04:	LHLD	RENPTR	;GET TABLE POINTER
	LXI	D,RENFIL ;POINT TO TABLE START
	MOV	A,L	;CHECK TO SEE IF THEY ARE SAME
	CMP	E
	JNZ	MAIN06	;NOT SAME, CONTINUE
	MOV	A,H
	CMP	D
	JZ	QUIT	;YES, SAME - EXIT TO CP/M
;
MAIN06:	LXI	D,-11	;SUBTRACT 11
	DAD	D
	SHLD	RENPTR
	XCHG		;DE POINTS TO NAME
	LXI	H,FCB+1	;WHERE TO PUT OLD NAME
	MVI	B,11	;NUMBER OF CHARACTERS
	CALL	MOVE
	XRA	A
	STA	FCB	;ZERO DRIVE NAME
	STA	FCBEXT	;ZERO EXTENT BYTE
	STA	FCB2	;ZERO DRIVE NAME
	STA	FCBEXT2	;ZERO FCB2 EXTENT BYTE
	LHLD	RENPTR
	XCHG		;DE NOW HAS NAME POINTER
	LXI	H,FCB2+1 ;WHERE TO PUT NEW NAME
	MVI	B,11	;NUMBER OF CHARACTERS
;
MAIN08:	LDAX	D	;GET CHARACTER
	ANI	7FH	;STRIP OFF ATTRIBUTE
	MOV	M,A
	INX	H
	INX	D
	DCR	B
	JNZ	MAIN08
	LXI	D,FCB
	CALL	RENAME
	JMP	MAIN04
;
QUIT:	JMP	0	;EXIT TO CP/M WARM BOOT
;
;	SYSTEM SUBROUTINES
;
;MAIN WORK LOOP
;
;THIS ROUTINE FINDS THE POSITION OF THE FILE
;INFORMATION IN THE DIRECTORY DMA, PRINTS THE
;NAME IF IT IS A CURRENT FILE, AND PRINTS A
;MESSAGE IF THE FILE WILL BE RENAMED.
;
WORKLOOP:
	LDA	RESULT	;RESULT HOLDS POSITION OF-
	MOV	B,A	; -THE DIRECTORY ENTRY IN THE DIR. DMA
	ANI	3
	RAL
	RAL
	RAL
	RAL
	RAL
	ANI	0E0H
	MOV	E,A
	MVI	D,0
	LXI	H,TBUFF
	DAD	D	;HL NOW POINTS TO THE FILE INFO
	MOV	A,M
	ORA	A	;USER 0 FILE?
	RNZ		;NO, IGNORE IT
	STA	ENTBYT	;A = 0
	INX	H	;POINT TO NAME
	SHLD	DIRPTR	;SAVE DIRECTORY POSITION POINTER
	MVI	B,11	;NUMBER OF CHARACTERS
;
;PRINT AS ASCII THE FIRST 11 CHARS IN THE ENTRY 
;
WORK02:	MOV	A,M
	CALL	ILLCHK
	CALL	TYPE
	DCR	B	;ONE LESS CHARACTER
	INX	H
	JNZ	WORK02
	CALL	CRLF	;TURN UP NEW LINE
	LDA	ENTBYT
	ORA	A
	RZ
	LXI	D,RENMSG ;RENAMING MESSAGE
	MVI	C,9	;WRITE CONSOLE FUNCTION
	CALL	BDOS
	CALL	CRLF	;TURN UP NEW LINE
	LHLD	DIRPTR	;GET DIRECTORY POSITION POINTER
	XCHG		;DE NOW = DIRECTORY POSITION
	LHLD	RENPTR
	MVI	B,11	;NUMBER OF CHARACTERS
	CALL	MOVE
	SHLD	RENPTR
	RET
;
;	TYPE A CHAR FROM (A)
;
TYPE:	PUSH	B
	PUSH	D
	PUSH	H
	MVI	C,2	;WRITE CONSOLE FUNCTION
	MOV	E,A	;CHARACTER TO E FOR CP/M
	CALL	BDOS
	POP	H
	POP	D
	POP	B
	RET
;
;	SEARCH FOR A FILE
;
SEARCH:	PUSH	B
	PUSH	D
	PUSH	H
	MVI	C,17	;SEARCH FIRST FUNCTION
	LXI	D,AFN
	CALL	BDOS
	STA	RESULT
	POP	H
	POP	D
	POP	B
	RET
;
;FIND NEXT OCCURRENCE OF FILE
;
NEXTFILE:
	PUSH	B
	PUSH	D
	PUSH	H
	MVI	C,18	;SEARCH NEXT FUNCTION
	LXI	D,AFN
	CALL	BDOS
	STA	RESULT
	POP	H
	POP	D
	POP	B
	RET
;
;RENAME A FILE
;
RENAME:	PUSH	B
	PUSH	D
	PUSH	H
	MVI	C,23	;RENAME FUNCTION
	CALL	BDOS
	POP	H
	POP	D
	POP	B
	RET
;
;NEWLINE
;
CRLF:	MVI	A,0DH
	CALL	TYPE
	MVI	A,0AH
	CALL	TYPE
	RET
;
;MOVE (B) CHARACTERS FROM (DE) TO (HL)
;
MOVE:	LDAX	D
	MOV	M,A
	INX	H
	INX	D
	DCR	B
	JNZ	MOVE
	RET
;
;CHECK FOR NONASCII CHARACTER  <20H  OR  >60H
;
ILLCHK:	CPI	20H
	JC	ILLEGL
	CPI	61H
	JNC	ILLEGL
	RET
;
ILLEGL:	MVI	A,0FFH
	STA	ENTBYT
	MVI	A,'-'
	RET
;
RENMSG:	DB	' ++RENAMING$'
;
;AMBIGUOUS FILENAME.TYP
;
AFN:	DB	0,'???????????',0
;
RESULT:	DB	0	;STORAGE FOR RESULT OF BDOS CALL
;
;STACK SPACE
;
	DS	60
STACK:	EQU	$
;
;SOME STORAGE LOCATIONS
;
ENTBYT:	DS	1
DIRPTR:	DS	2
RENPTR:	DS	2
RENFIL	EQU	$	;FILE OF RENAMEABLE FILES BUILDS HERE
;
	END
