display.s

坦尼保姆

! CNTRL-v is an terminal escape character for some control characters.

ft_ld:

	PUSH	AX			! save registers
	PUSH	BX
	PUSH	CX
	PUSH	DX
	PUSH	SI
	PUSH	DI
	PUSH	BP
	MOV	BP, SP

	PUSH	fontl			! Push font file name
	MOV	BX, tm_hd
	LEA	AX, TM_FONTPATH(BX)	! Push font directory
	PUSH	AX
	PUSH	_ffn			! Set the string buffer
	PUSH	buf
	PUSH	_SPRINTF		! format string system call
	SYS				! buf contains pathname of file
	ADD	SP, 10

	PUSH	O_RDONLY		! open font file
	PUSH	buf			! PUSH path name pointer
	PUSH	_OPEN
	SYS
	ADD	SP, 6

	MOV	(fd), AX		! check for open error
	CMP	(fd), 0
	JGE	0f

	PUSH	buf
	CALL	op_err
	ADD	SP, 2

0:
	PUSH	FT_HD_SZ		! read font header
	PUSH	ft_hd
	PUSH	(fd)
	PUSH	_READ
	SYS
	ADD	SP, 8

	CMP	AX, FT_HD_SZ		! check for read error
	JE	1f

	PUSH	err4
	PUSH	_PRINTF
	SYS
	ADD	SP, 4
	CALL	ex_err

1:
	MOV	BX, ft_hd		! check size of font cache
	CMP	FT_SIZE(BX), FT_CH_SZ
	JLE	2f

	PUSH	err5
	PUSH	_PRINTF
	SYS
	ADD	SP, 4
	CALL	ex_err

2:
	PUSH	FT_SIZE(BX)		! read font data
	PUSH	ft_ch
	PUSH	(fd)
	PUSH	_READ
	SYS
	ADD	SP, 8

	CMP	AX, FT_SIZE(BX)		! check for read error
	JE	3f

	PUSH	err6
	PUSH	_PRINTF
	SYS
	ADD	SP, 4
	CALL	ex_err

3:
	PUSH	(fd)			! close font file
	PUSH	_CLOSE
	SYS
	ADD	SP, 6
	MOV	SP, BP
	POP	BP
	POP	DI
	POP	SI
	POP	DX
	POP	CX
	POP	BX
	POP	AX
	RET

!
! some small functions
!

op_err:					! Open error routine
	PUSH	BP
	MOV	BP, SP
	PUSH	4(BP)
	PUSH	err1
	PUSH	_PRINTF
	SYS
	ADD	SP, 6
	CALL	ex_err
	MOV	SP, BP
	POP	BP
	RET

ex_err:				! exit in case of an error
	PUSH	1
	PUSH	_EXIT
	SYS

ex_ok:				! exit in case of success
	PUSH	0
	PUSH	_EXIT
	SYS

! global initialized data

.SECT	.DATA

fontl:	.ASCIZ	"n"		! font name normal font (times roman)
tm_cf:	.ASCIZ	"sys/term.cf"	      ! pathname terminal header
	! for terminal with characters fonts up to 8x14 bits. The window size is
	! 36x16 characters.
	! alternative term9.cf : 9x16 bits, 32x14 characters
	! alternative term7.cf : 7x13 bits, 40x17 characters

err1:	.ASCIZ	"Cannot open %s\n"
err2:	.ASCIZ	"Error reading terminal configuration data\n"
err3:	.ASCIZ	"Screen cache not big enough\n"
err4:	.ASCIZ	"Error reading font header\n"
err5:	.ASCIZ	"Font cache not big enough\n"
err6:	.ASCIZ	"Error reading font data\n"
err7:	.ASCIZ	"Error reading standard input\n"

! some global and often used local variables

.SECT	.BSS
.ALIGN	2
fd:	.SPACE	2			! file descriptor variable
tmbytw:	.SPACE	2			! width of terminal in bytes
buf:	.SPACE	128			! general purpose string buffer
tm_ch:	.SPACE	TM_CH_SZ		! reserve space for termina bitmap
tm_hd:	.SPACE	TM_HD_SZ		! reserve space for terminal record
ft_hd:	.SPACE	FT_HD_SZ		! reserve space for font table header
ft_ch:	.SPACE	FT_CH_SZ		! reserve space for font table
_eod:	.SPACE	2			! dummy variable end of data

.SECT .DATA
pstringa: .ASCII "%!PS-Adobe-2.0 EPSF-2.0\n%%Title: exercise.ps\n"
.ASCII "%%Creator: XV Version 3.10a  Rev: 12/29/94  -  by John Bradley\n"
.ASCII "%%BoundingBox: 32 182 581 611\n%%Pages: 1\n%%EndComments\n"
.ASCII "%%EndProlog\n%%Page: 1 1\n/origstate save def\n20 dict begin\n"
.ASCII "/grays 288 string def \n/npixls 0 def\n"
.ASCIZ "/rgbindx 0 def\n37 187 translate\n538.56000 418.89600 scale\n"
pstringb: .ASCII "\n\n\nshowpage\n% stop using temporary dictionary\nend\n\n"
.ASCIZ "% restore original state\norigstate restore\n\n%%Trailer\n"
pstringc: .ASCII "/pix %d string def\n%d %d 1\n[%d 0 0 -%d 0 %d]\n"
pstringd: .ASCIZ "{currentfile pix readhexstring pop }\nimage\n"
pstringe: .ASCIZ "%02x"
pstringf: .ASCIZ "\n"
pstringg: .ASCIZ "charmap`.eps"
pstringh: .ASCIZ "Cannot open postscript file %s\n"
pstringi: .ASCIZ "charmap`.pbm"
.ALIGN	2

.SECT .TEXT
posout:
	INCB (pstringg+7)
	PUSH 0644
	PUSH pstringg
	PUSH _CREAT
	SYS
	ADD  SP,6
	CMP  AX,0
	JL   9F
	MOV  (fd),AX
	PUSH pstringa
	PUSH AX
	CALL stringpr
	ADD  SP,4
	MOV  AX,TM_WID(BX)
	MOVB CL,3
	SAR  AX,CL
	MOV  (tmbytw),AX
	PUSH TM_HT(BX)
	PUSH TM_HT(BX)
	PUSH TM_WID(BX)
	PUSH TM_HT(BX)
	PUSH TM_WID(BX)
	PUSH AX
	PUSH pstringc
	PUSH buf
	PUSH _SPRINTF
	SYS
	ADD SP,18
	PUSH buf
	PUSH (fd)
	CALL stringpr
	ADD SP,4

	MOV SI,tm_ch
	MOV CX,TM_HT(BX)
6:	PUSH CX
	MOV CX,(tmbytw)
	MOV DI,buf
7:	LODSB
	PUSH AX
	PUSH pstringe
	PUSH DI
	PUSH _SPRINTF
	SYS
	ADD  SP,8
	ADD  DI,2
	LOOP 7b

	MOV  (DI),'\n'
	MOV  AX,(tmbytw)
	SHL  AX,1
	INC  AX
	PUSH AX
	PUSH buf
	PUSH (fd)
	PUSH _WRITE
	SYS
	ADD  SP,8
	POP CX
	LOOP 6b
	PUSH pstringb
	PUSH (fd)
	CALL stringpr
	PUSH _CLOSE
	SYS
	ADD  SP,6
	RET

geterr:
	PUSH err7
	PUSH _PRINTF
	SYS
	CALL ex_err

crerror:
9:	PUSH pstringg
	PUSH pstringh
	PUSH _PRINTF
	SYS
	CALL ex_err

stringpr:
	PUSH CX
	PUSH DI
	PUSH BP
	MOV  BP,SP
	MOV  AX,0
	MOV  DI,10(BP)
	MOV  SI,DI
	MOV  CX,-1
	REPNZ SCASB
	NOT  CX
	DEC  CX
	PUSH CX
	PUSH 10(BP)
	PUSH 8(BP)
	PUSH _WRITE
	SYS
	MOV  SP,BP
	POP  BP
	POP  DI
	POP  CX
	RET

	_FAKEWIN	= 64			! extra routine to open window
	_FWINOUT	= 65			! and to write onto window
		_ENKLBIT	= 1		! small window display per bit
		_DBBLBIT	= 2		! large window, square per bit
						! The prevous subroutines create
						! two x window bitmap files:
						! lEEGbITmAP and tERMbITmAP
! next we get a routine to initialise an output window. It is made with an
! unorthodox type of extra library routine. Its parameters are width and height
! of the terminal bit map.
! Do not worry about this routine at all.
.SECT .DATA
faker:	.WORD 0

.SECT .TEXT
startfak:
	INC	(faker)
	PUSH	_DBBLBIT		! Bit size two bits per bit in display
	PUSH	TM_HT(BX)		! Stack height of bitmap in bits
	PUSH	TM_WID(BX)		! Stack width of bitmap in bits
	PUSH	_FAKEWIN		! stack library call number
	SYS				! and ask for the routine
	ADD	SP,8			! clean up stack.
	RET
! Hope that the window system is smart enough to open up the window now.

tclout:
	PUSH	AX			! save registers on stack
	PUSH	BX
	PUSH	BP
	MOV	BP, SP
	MOV	BX, tm_hd		! BX indicates start of terminal record
	CMP	(faker),0
	JG	8f
	CALL	startfak
8:	PUSH	tm_ch			! Start adress of bitmap
	MOV	BX, tm_hd		! BX indicates start of terminal record
	PUSH	TM_HT(BX)		! Stack height of bitmap in bits
	PUSH	TM_WID(BX)		! Stack width of bitmap in bits
	PUSH	_FWINOUT		! stack library call number
	SYS				! and ask for the routine
	ADD	SP, 8			! clean up stack.
	MOV	SP, BP
	POP	BP			! restore registers
	POP	BX
	POP	AX
	RET
! Hope that the window system is smart enough to write onto the window now.
! end of file