NEW
  AUTO 3,1
				.LIST OFF
				.OP	65C02
				.OR	$2000
				.TF bin/more
*/-------------------------------------
* # MORE
* Displays content of specified file
* Input pipe allowed
* ## Arguments
* **-H**
* Displays help screen
* **-N**
* Number all output lines
* **-P**
* Page mode, no scroll
* ## Return Value
*\-------------------------------------
				.INB inc/macros.i
				.INB inc/a2osx.i
				.INB inc/kernel.i
				.INB inc/mli.i
				.INB inc/mli.e.i
*--------------------------------------
PG.SIZE			.EQ 23
*--------------------------------------
				.DUMMY
				.OR ZPBIN
ZS.START
ZPPtr1			.BS 2
ZPBufPtr		.BS 2
ArgCount		.BS 1
hFile			.BS 1
LineCount		.BS 1
LineNum			.BS 2
bHelp			.BS 1
bLineNum		.BS 1
bPage			.BS 1
ArgIndex		.BS 1
hBuf			.BS 1
ZS.END			.ED
*--------------------------------------
*			File Header (16 Bytes)
*--------------------------------------
CS.START		cld
				jmp (.1,x)
				.DA #$61				6502,Level 1 (65c02)
				.DA #1					BIN Layout Version 1
				.DA #0					S.PS.F.EVENT
				.DA #0
				.DA CS.END-CS.START		Code Size (without Constants)
				.DA DS.END-DS.START		Data SegmentSize
				.DA #64					Stack Size
				.DA #ZS.END-ZS.START	Zero Page Size
				.DA 0
*--------------------------------------
* Relocation Table
*--------------------------------------
.1				.DA CS.INIT
				.DA CS.RUN
				.DA CS.DOEVENT		
				.DA	CS.QUIT
L.MSG.USAGE		.DA MSG.USAGE
L.MSG.Init		.DA MSG.Init
L.MSG.NUMLINE	.DA MSG.NUMLINE
L.MSG.Pause		.DA MSG.Pause
L.MSG.PauseErase	.DA MSG.PauseErase
				.DA 0
*--------------------------------------
CS.RUN			inc ArgCount
				lda ArgCount
				>SYSCALL ArgV
				bcs .7

				>STYA ZPPtr1
				lda (ZPPtr1)
				cmp #'-'
				bne .4

				ldy #1 
				lda (ZPPtr1),y
				beq .99

.1				ldx #OptionVars-OptionList-1

.2				cmp OptionList,x
				beq .3

				dex
				bpl .2
				
.99				>LDYA L.MSG.USAGE
				>SYSCALL PutS
				lda #E.SYN
				sec
.9				rts

.3				lda OptionVars,x
				tax
				sec
				ror $0,x
				
				iny
				lda (ZPPtr1),y
				bne .1
				
				bra CS.RUN

.4				lda hFile
				bne .99

				>LDYA ZPPtr1
				jsr CS.RUN.OPEN
				bcs .9

				bra CS.RUN				scan for any other args

.7				lda bHelp
				beq .8

.71				jsr .99
				lda #0
				rts

.8				lda hFile
				bne .80

				ldy #S.PS.hStdIn
				lda (pPS),y
				
				pha
				
				tax

				lda hFDs-1,x
				>SYSCALL GetMemPtr
				>STYA ZPPtr1
			
				plx
				
				lda (ZPPtr1)
				cmp #S.FD.T.PIPE
				bne .71
				
				stx hFile
	
.80				>LDYAI 256
				>SYSCALL GetMem
				bcs .9

				>STYA ZPBufPtr
				stx hBuf

				>PUSHW L.MSG.Init
				>PUSHBI 0
				>SYSCALL PrintF
*--------------------------------------				
CS.RUN.LOOP		jsr CS.RUN.GETLINE
				bcs	.9

.1				inc LineNum
				bne .11

				inc LineNum+1

.11				lda LineCount
				bne .2

				lda bPage
				beq .2

				lda #C.FF
				>SYSCALL PutChar

.2				jsr CS.RUN.PRINT

				inc LineCount
				lda LineCount
				cmp #PG.SIZE
				bne CS.RUN.LOOP

				stz LineCount
				jsr CS.RUN.PAUSE
				bcc CS.RUN.LOOP

.9				cmp #MLI.E.EOF
				bne .99

				lda #0					Exit with no Error

.99				sec
				rts
*--------------------------------------
CS.RUN.OPEN		>PUSHYA
				>PUSHBI	O.RDONLY+O.TEXT
				>PUSHBI S.FI.T.TXT
				>PUSHWZ				Aux type
				
				>SYSCALL FOpen
				bcs .9

				sta hFile

.9				rts
*--------------------------------------
CS.RUN.PAUSE	ldy #S.PS.hStdErr
				lda (pPS),y
				>PUSHA
				>PUSHW L.MSG.Pause
				>SYSCALL FPutS
				
.10				ldy #S.PS.hStdErr
				lda (pPS),y
				>SYSCALL GetC
				bcs .99

				cmp #'Q'
				beq .9

				cmp #'q'
				beq .9

.3				cmp #C.SPACE
				bne .4

				jmp CS.RUN.ERASE

.4				cmp #C.CR
				bne .10

				jsr CS.RUN.ERASE

.40				jsr CS.RUN.GETLINE
				bcc .5

				cmp #MLI.E.EOF
				beq .90

				rts

.5				inc LineNum
				bne .6

				inc LineNum+1

.6				jsr CS.RUN.PRINT

				bra CS.RUN.PAUSE
.9				jsr CS.RUN.ERASE

.90				lda #0
.99				sec
				rts
*--------------------------------------
CS.RUN.ERASE	ldy #S.PS.hStdErr
				lda (pPS),y
				>PUSHA
				>PUSHW L.MSG.PauseErase
				>SYSCALL FPutS
				rts
*--------------------------------------
CS.RUN.GETLINE	>PUSHB hFile
				
				>PUSHW ZPBufPtr
				>PUSHWI	256
				>SYSCALL FGetS
				rts
*--------------------------------------
CS.RUN.PRINT	lda bLineNum
				bpl .1

				>PUSHW L.MSG.NUMLINE
				>PUSHW LineNum
				>PUSHBI 2
				>SYSCALL PrintF
				bcs .9

.1				>LDYA ZPBufPtr
				>SYSCALL PutS

.9				rts
*--------------------------------------
CS.QUIT			lda hBuf
				beq .1

				>SYSCALL FreeMem

.1				lda hFile
				beq .2

				>SYSCALL FClose
.2
.8
CS.INIT			clc
				rts
*--------------------------------------
CS.DOEVENT		sec
				rts
*--------------------------------------
CS.END
*--------------------------------------
OptionList		.AS "NnHhPp"
OptionVars		.DA #bLineNum,#bLineNum,#bHelp,#bHelp,#bPage,#bPage
*--------------------------------------
MSG.USAGE		.CS "Usage : MORE <File>\r\n"
				.CS "   -H : This help screen\r\n"
				.CS "   -N : Number all output lines\r\n"
				.CZ "   -P : Page mode, no scroll\r\n"
MSG.Init		.CZ "\e[?7l"
MSG.NUMLINE		.CZ "%5D:"
MSG.Pause		.CZ "\r\e[7m --- 'SPACE' for more, 'CR' one line, 'Q/q' to quit --- \e[0m"
MSG.PauseErase	.CZ "\r\e[2K"
*--------------------------------------
				.DUMMY
				.OR 0
DS.START
DS.END			.ED
*--------------------------------------
MAN
SAVE usr/src/bin/more.s
ASM
