;  PROGRAM:  ERASE
;  VERSION:  5.0
;  DATE:  18 MAY 84
;  AUTHOR:  RICHARD CONN
;  PREVIOUS VERSION:  4.0 (16 JAN 83)
;  PREVIOUS VERSION:  3.3 (6 JAN 83), 3.2 (7 DEC 82)
;  PREVIOUS VERSION:  3.1 (9 NOV 82), 3.0 (18 OCT 82), 2.0 (18 NOV 81)
;  PREVIOUS VERSION:  1.2 (12 APR 81), 1.3 (25 OCT 81), 1.4 (26 OCT 81)
;  PREVIOUS VERSION:  1.0 (14 JUN 80), 1.1 (19 OCT 80)
VERS	equ	50
z3env	SET	0f400h

;
;  ERASE COMMAND --
;	Erase files specified in command line.  Command is of the form --
;		ERASE DIR:FILENAME.TYP,... ISR
;	If I option is given, Inspection of each file is performed and
; the user is given the option to erase the file or not.  If S option is
; given, System files are included in erase procedure.  Drive specification
; is optional.  If R option is given, R/O files are erased without prompting.
;

FALSE	EQU	0
TRUE	EQU	NOT FALSE

ESIZE	EQU	16	; SIZE OF DIR ENTRY (FROM SYSLIB DIRQ ROUTINE)

	EXT	DIRQ	; DIRECTORY PROCESSOR

	EXT	Z3INIT	; INIT Z3 ENV
	EXT	ZFNAME	; FILE NAME PARSER
	EXT	Z3LOG	; LOG INTO Z3 FCB SPEC

	EXT	PUTUD	; SAVE CURRENT DU
	EXT	GETUD	; GET CURRENT DU
	EXT	PHLDC	; PRINT HL AS DECIMAL CHARS
	EXT	EPRINT	; PRINT ROUTINE
	EXT	COUT	; CONSOLE OUTPUT ROUTINE
	EXT	CIN	; CONSOLE INPUT ROUTINE
	EXT	CAPS	; CAPITALIZE ROUTINE
	EXT	CRLF	; NEW LINE ROUTINE
	EXT	FILLB	; FILL ROUTINE
	EXT	CODEND	; CODE END COMPUTATION ROUTINE

;
;  CP/M EQUATES
;
CPM	EQU	0	; WARM BOOT
BDOS	EQU	5	; BDOS ENTRY
FCB	EQU	5CH	; FCB
BUFF	EQU	80H	; INPUT LINE BUFFER
CR	EQU	13	; <CR>
LF	EQU	10	; <LF>

;
; Environment Definition
;
	if	z3env ne 0
;
; External ZCPR3 Environment Descriptor
;
	jmp	start
	db	'Z3ENV'	;This is a ZCPR3 Utility
	db	1	;External Environment Descriptor
z3eadr:
	dw	z3env
start:
	lhld	z3eadr	;pt to ZCPR3 environment
;
	else
;
; Internal ZCPR3 Environment Descriptor
;
	MACLIB	Z3BASE.LIB
	MACLIB	SYSENV.LIB
z3eadr:
	jmp	start
	SYSENV
start:
	lxi	h,z3eadr	;pt to ZCPR3 environment
	endif

;
; Start of Program -- Initialize ZCPR3 Environment
;
	call	z3init	;initialize the ZCPR3 Env and the VLIB Env
;
	LXI	H,0	; GET STACK PTR
	DAD	SP
	SHLD	STACK	; SAVE IT
;
; Compute Buffer Locations
;
	CALL	CODEND	; DETERMINE FREE SPACE
	SHLD	CMDLNE	; SET PTR TO COMMAND LINE
	LXI	D,100H	; BUFFER SIZE
	DAD	D	; COMMAND LINE
	SHLD	ERAFCB	; FCB FOR ERASE
	DAD	D
	SHLD	DIRBUF	; SET PTR TO DIRECTORY BUFFER
	SPHL		; SET STACK PTR
;
; Save Location
;
	CALL	PUTUD	; SAVE AWAY CURRENT DU

;
; Print Banner
;
	CALL	EPRINT
	DB	'ERASE  Version '
	DB	VERS/10+'0','.',(VERS MOD 10)+'0',0
	LDA	FCB+1	; GET FIRST CHAR OF FILE NAME
	CPI	'/'	; OPTION CAUGHT?
	JNZ	ECONT

;  PRINT HELP INFORMATION
HELP:
	CALL	EPRINT
	DB	CR,LF,'  ERASE dir:filename.typ,dir:fn.ft,... o...'
	DB	CR,LF,'Options:'
	DB	CR,LF,'   I -- Inspect Mode'
	DB	CR,LF,'   R -- Erase R/O Files without prompting user'
	DB	CR,LF,'   S -- Include System Files'
	DB	0
	JMP	RETURN

;  RETURN TO OS
RETURN:
	CALL	GETUD	; RESET USER IF NECESSARY
RETX:
	LHLD	STACK	; GET OLD STACK
	SPHL		; SET IT
	RET

;  COPY BUFFER INTO TEMP BUFFER
ECONT:
	LHLD	CMDLNE	; PT TO COMMAND LINE
	XCHG		; ... IN DE
	LXI	H,BUFF+1	; PT TO BUFFER
	MVI	B,80H	; BUFFER SIZE (MAX)
	CALL	MOVEB	; COPY INTO COMMAND LINE BUFFER

;  EXTRACT FLAGS IF PRESENT
	XRA	A	; SET NO INSPECT, NO R/O, AND NO SYSTEM FILES
	STA	INSPECT
	STA	READONLY
	MVI	A,80H	; SELECT NON-SYS
	STA	SYSTEM
	LXI	H,0	; SET FILE COUNT
	SHLD	FILECNT
	LHLD	CMDLNE	; PT TO BUFFER

;  SKIP TO FILE NAME STRING
SBLANK:
	MOV	A,M	; SKIP TO NON-BLANK
	CPI	' '	; <SP>?
	JNZ	SBL1
	INX	H	; PT TO NEXT CHAR
	JMP	SBLANK

;  SKIP TO END OF FILE NAME STRING
SBL1:
	MOV	A,M	; SKIP TO <SP> OR EOL
	ORA	A	; DONE?
	JZ	OPT
	CPI	' '	; <SP>
	JZ	OPT
	INX	H	; PT TO NEXT
	JMP	SBL1

;  CHECK FOR LEADING SLASH ON OPTION AND SKIP IT IF SO
OPT:
	CPI	'/'	; OPTION CHAR?
	JNZ	OPTION
	INX	H	; SKIP SLASH

;  PROCESS LIST OF OPTIONS
OPTION:
	MOV	A,M	; GET BYTE
	ORA	A	; DONE?
	JZ	DSPEC
	INX	H	; PT TO NEXT CHAR
	CPI	' '	; SKIP OVER SPACES
	JZ	OPTION
	CPI	'/'	; IF OPTION LETTER, OBVIOUS ERROR, SO HELP
	JZ	HELP
	CPI	'I'	; INSPECT?
	JZ	OPTINS
	CPI	'R'	; READ/ONLY?
	JZ	OPTRO
	CPI	'S'	; SYSTEM FILES?
	JNZ	HELP

;  SET SYS SELECTION
	MVI	A,0C0H	; SET FOR SYS AND NON-SYS FILES
	STA	SYSTEM
	JMP	OPTION

;  SET INSPECT OPTION
OPTINS:
	MVI	A,0FFH	; INSPECT
	STA	INSPECT
	JMP	OPTION

;  SET R/O OPTION
OPTRO:
	MVI	A,0FFH	; SET R/O
	STA	READONLY
	JMP	OPTION

;  EXTRACT DISK, USER, AND FILE NAME INFORMATION
DSPEC:
	LHLD	CMDLNE	; PT TO BEFORE FIRST BYTE
	DCX	H	; PT TO BEFORE FIRST BYTE FOR FOLLOWING INX
DSPEC0:
	INX	H	; PT TO BYTE
	MOV	A,M	; GET BYTE
	ORA	A	; DONE?
	JZ	HELP
	CPI	' '	; <SP>?
	JZ	DSPEC0
;
;  MAJOR REENTRY POINT WHEN FILE SPECS ARE SEPARATED BY COMMAS
;    HL PTS TO FIRST BYTE OF NEXT FILE SPEC
;
DSPEC1:
	CALL	GETUD	; RETURN HOME
	LXI	D,FCB	; PT TO FCB IN DE, PT TO FIRST CHAR OF FILE NAME IN HL
	MVI	A,0	; SCAN FOR DIR FORM BEFORE DU
	CALL	ZFNAME	; EXTRACT FILE NAME INTO FCB, AND GET DISK AND USER
	SHLD	NEXTCH	; SAVE PTR TO DELIMITER WHICH ENDED SCAN
	LXI	H,FCB+1	; SEE IF FILE NAME IS ALL WILD
	MVI	B,11	; 11 BYTES
WTEST:
	MOV	A,M	; GET BYTE
	INX	H	; PT TO NEXT
	CPI	'?'	; WILD?
	JNZ	NOWILD
	DCR	B	; COUNT DOWN
	JNZ	WTEST
	LDA	INSPECT	; INSPECT?
	ORA	A	; 0=NO
	JNZ	NOWILD
	CALL	EPRINT
	DB	CR,LF,'Erase All Files? ',0
	CALL	CIN	; GET RESPONSE
	CALL	CAPS	; CAPITALIZE
	CALL	COUT	; ECHO
	CPI	'Y'	; YES?
	JZ	NOWILD
	CALL	EPRINT
	DB	CR,LF,'Aborting',0
	JMP	RETX
NOWILD:
	LXI	D,FCB	; PT TO FCB
	CALL	Z3LOG	; LOG INTO DIRECTORY

;  LOAD DIRECTORY AND ERASE FILES
ERASE:
	LHLD	DIRBUF	; PT TO DIR BUFFER
	LDA	SYSTEM	; GET SYS/NON-SYS FLAGS
	LXI	D,FCB	; PT TO FCB
	CALL	DIRQ	; LOAD DIR, SELECT FILES, PACK, AND ALPHABETIZE

;  ERASE DIR FILES; HL PTS TO FIRST FILE, BC=FILE COUNT
	CALL	ERAFILES

;  CHECK FOR NEXT FILE SPEC
	LHLD	NEXTCH	; GET PTR
	MOV	A,M	; GET DELIM
	CPI	','	; ANOTHER FILE?
	JNZ	ERADONE
	INX	H	; PT TO CHAR AFTER COMMA
	JMP	DSPEC1	; CONTINUE PROCESSING

;  ERASE COMPLETE -- PRINT COUNT AND EXIT
ERADONE:
	CALL	PRCOUNT	; PRINT FILE COUNT
	JMP	RETURN

;  ERASE SELECTED FILES
ERAFILES:
	MOV	A,B	; CHECK FOR ANY FILES LOADED
	ORA	C
	RZ

;  PRINT FILE NAME
ERAFLP:
	PUSH	B	; SAVE ENTRY COUNT
	CALL	CRLF	; NEW LINE
	PUSH	H	; SAVE PTR TO FCB
	INX	H	; PT TO FILE NAME
	MVI	B,8	; PRINT NAME
	CALL	PRNT
	MVI	A,'.'	; DECIMAL
	CALL	COUT
	MVI	B,3	; PRINT TYPE
	CALL	PRNT
	POP	H	; GET PTR

;  CHECK FOR INSPECTION AND INSPECT IF SET
	LDA	INSPECT	; GET FLAG
	ORA	A	; 0=NO
	JZ	ERAIT

;  PROMPT USER FOR ERASE
	CALL	ERAQ	; ERASE QUESTION
	CPI	'Q'	; QUIT?
	JZ	QUIT
	CPI	'Y'	; YES?
	JZ	ERAIT

;  DON'T ERASE FILE
ERANO:
	CALL	EPRINT
	DB	'  NOT Erased',0
	JMP	ERATEST

;  PROMPT USER FOR ERASE
ERAQ:
	CALL	EPRINT	; PRINT PROMPT
	DB	' -- Erase (Y/N/Q=Quit/other=N)? ',0
	CALL	CIN	; GET RESPONSE
	CALL	CAPS	; CAPITALIZE
	CALL	COUT	; ECHO
	RET

;  QUIT ERASE PROGRAM
QUIT:
	CALL	PRCOUNT	; PRINT COUNT OF FILES ERASED
	JMP	RETURN

;  ERASE FILE
ERAIT:
	PUSH	H
	LXI	D,9	; PT TO R/O ATTRIBUTE
	DAD	D
	MOV	A,M	; GET R/O ATTRIBUTE
	POP	H	; RESTORE PTR
	ANI	80H	; R/O?
	JZ	ERAIT1	; R/W - PROCEED
	LDA	READONLY	; GET R/O ERASE FLAG
	ORA	A	; 0=QUERY
	JNZ	ERAIT0	; ERASE WITHOUT QUESTION IF FLAG SET
	CALL	EPRINT	; NOTIFY USER AND PROMPT
	DB	CR,LF,' File is R/O',0
	CALL	ERAQ	; ASK QUESTION
	CPI	'Q'	; QUIT?
	JZ	QUIT
	CPI	'Y'	; ERASE R/O
	JNZ	ERATEST	; DO NOT ERASE IF NOT YES

;  ERASE R/O FILE
ERAIT0:
	PUSH	H	; SAVE PTR TO FILE ENTRY
	LXI	D,9	; PT TO R/O ATTRIBUTE
	DAD	D
	MOV	A,M	; GET ATTRIBUTE
	ANI	7FH	; MAKE R/W
	MOV	M,A
	POP	H	; GET PTR TO FCB
	PUSH	H	; SAVE PTR AGAIN
	XCHG		; DE PTS TO FCB
	XRA	A	; MAKE SURE CURRENT DISK IS SELECTED
	STAX	D
	MVI	C,30	; SET FILE ATTRIBUTES
	CALL	BDOS
	POP	H

;  ERASE R/W FILE
ERAIT1:
	PUSH	H	; SAVE PTR TO FILE NAME TO ERASE
	INX	H	; PT TO FIRST BYTE OF NAME
	PUSH	H	; SAVE HL
	LHLD	ERAFCB	; SET UP FCB
	XCHG		; ... IN DE
	POP	H	; GET HL
	PUSH	D	; SAVE PTR
	XRA	A	; A=0
	STAX	D	; CURRENT DISK
	INX	D	; PT TO FIRST CHAR
	MVI	B,11	; COPY 11 BYTES
	CALL	MOVEB	; COPY HL TO DE FOR 11 BYTES
	XCHG		; HL PTS TO REST OF FCB
	MVI	B,24	; FILL REST OF FCB WITH ZEROES
	XRA	A	; A=0
	CALL	FILLB
	POP	D	; GET PTR
	MVI	C,19	; DELETE FILE
	CALL	BDOS
	CALL	EPRINT
	DB	'      Erased',0
	LHLD	FILECNT	; INCREMENT COUNT
	INX	H
	SHLD	FILECNT
	POP	H	; GET PTR TO DIRECTORY ENTRY

;  PT TO NEXT ENTRY
ERATEST:
	LXI	D,ESIZE	; PT TO NEXT ENTRY
	DAD	D
	POP	B	; GET COUNT
	DCX	B	; COUNT DOWN
	MOV	A,B	; CHECK FOR ZERO
	ORA	C
	JNZ	ERAFLP

;  RETURN TO CALLER
	RET

;
;  COPY HL TO DE FOR B BYTES
;
MOVEB:
	MOV	A,M	; GET BYTE
	STAX	D	; PUT BYTE
	INX	H	; PT TO NEXT
	INX	D
	DCR	B	; COUNT DOWN
	JNZ	MOVEB
	RET

;
;  PRINT CHARS PTED TO BY HL FOR B BYTES
;
PRNT:
	MOV	A,M	; GET CHAR
	CALL	COUT
	INX	H	; PT TO NEXT
	DCR	B	; COUNT DOWN
	JNZ	PRNT
	RET

;
;  PRINT COUNT OF NUMBER OF FILES ERASED
;
PRCOUNT:
	CALL	CRLF	; NEW LINE
	LHLD	FILECNT	; GET COUNT
	MOV	A,L	; CHECK FOR NONE
	ORA	H
	JZ	PRNO
	CALL	PHLDC	; PRINT DECIMAL COUNT
	JMP	PRMS
PRNO:
	CALL	EPRINT
	DB	'No',0
PRMS:
	LHLD	FILECNT	; 1 FILE ERASED?
	MOV	A,H	; HIGH ZERO?
	ORA	A
	JNZ	PRMULT
	MOV	A,L	; LOW ONE?
	CPI	1
	JZ	PRSING
PRMULT:
	CALL	EPRINT
	DB	' Files Erased',0
	RET
PRSING:
	CALL	EPRINT
	DB	' File  Erased',0
	RET

;
;  BUFFERS
;
INSPECT:
	DS	1	; INSPECT FLAG (0=NO, 0FFH=YES)
SYSTEM:
	DS	1	; SYSTEM FLAG (0=NO, 80H=YES)
READONLY:
	DS	1	; READ/ONLY FLAG (0=QUERY FOR R/O, 0FFH=DON'T)
USER:
	DS	1	; NEW USER, OR 0FFH IF NO CHANGE
CURUSER:
	DS	1	; CURRENT USER NUMBER
NEXTCH:
	DS	2	; PTR TO NEXT CHAR IN MULTIFILE COMMAND LINE
FILECNT:
	DS	2	; COUNT OF NUMBER OF FILES ERASED
ERAFCB:
	DS	2	; PTR TO FCB FOR ERASE
CMDLNE:
	DS	2	; PTR TO COMMAND LINE
DIRBUF:
	DS	2	; PTR TO DIRECTORY BUFFER
STACK:
	DS	2	; OLD STACK PTR

	END