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NANSI_F.ASM
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Assembly Source File
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1987-07-19
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17KB
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637 lines
;----- nansi_f.asm ---------------------------------------------
; The ANSI control subroutines.
; (C) 1986 Daniel Kegel, Pasadena, CA
; May be distributed for educational and personal use only
; Each routine is called with the following register usage:
; AX = max(1, value of first parameter)
; Z flag is set if first parameter is zero.
; CX = number of paramters
; SI = offset of second parameter from CS
; DS = CS
; ES:DI points to the current location on the memory-mapped screen.
; DX is number of characters remaining on the current screen line.
; The control routine is free to trash AX, BX, CX, SI, and DS.
; It must preserve ES, and can alter DX and DI if it wants to move the
; cursor.
;
; Revisions:
; 19 Aug 85: Fixed horrible bug in insert/delete line.
; 26 Aug 85: Fixed simple limit-to-one-too-few-lines bug in ins/del line;
; anyway, it inserts 24 lines when on line 2 now. Whether it's fixed...
; 4 Sept 85: Fixed bug created on 26 Aug 85; when limiting ins/del line
; count, we are clearing, not scrolling; fixed BIOS call to reflect this.
; 30 Jan 86: Added EGA cursor patch
; 31 Jan 86: Disabled insert/delete char in graphics modes
; Implemented keyboard redefinition reset
; 1 Feb 86: added video_mode and max_x test after mode set
;----------------------------------------------------------------
include nansi_d.asm
; To nansi_p.asm
public ansi_fn_table
; From nansi.asm
extrn port_6845:word
extrn cur_coords:word, saved_coords:word
extrn cur_x:byte, max_x:byte
extrn cur_y:byte, max_y:byte
extrn cur_attrib:byte, wrap_flag:byte
extrn xy_to_regs:near
extrn get_blank_attrib:near
extrn xlate_tab_ptr:word
extrn cpr_esc:byte, cprseq:word
extrn video_mode:byte
extrn lookup:near
extrn in_g_mode:near
; from nansi_p.asm
extrn param_buffer:word ; used in keyboard programming
extrn param_end:word
extrn redef_end:word
keybuf struc ; used in making cpr sequence
len dw ?
adr dw ?
keybuf ends
ABS40 segment at 40h
org 1ah
buffer_head dw ? ; Used in 'flush input buffer' dos call.
buffer_tail dw ?
org 49h
crt_mode db ?
crt_cols dw ?
crt_len dw ?
crt_start dw ?
cursor_posn dw 8 dup (?)
cursor_mode dw ?
active_page db ?
addr_6845 dw ?
crt_mode_set db ?
crt_palette db ?
ABS40 ends
code segment byte public 'CODE'
assume cs:code, ds:code
;----- byteout ---------------------------------------------------
; Converts al to a decimal ASCII string (in 0..99),
; stores it at ES:DI++. Returns DI pointing at byte after last digit.
; Destroys DL.
byteout proc near
aam
add ax, 3030h
xchg ah, al
stosb
xchg ah, al
stosb
ret
byteout endp
;----- ansi_fn_table -----------------------------------
; Table of offsets of terminal control subroutines in order of
; the character that invokes them, @..Z, a..z. Exactly 53 entries.
; All the subroutines are defined below in this module.
ansi_fn_table label word
dw ic, cup, cdn, cfw, cbk ; @, A, B, C, D
dw nul, nul, nul, hvp, nul ; E, F, G, H, I
dw eid, eil, il, d_l, nul ; J, K, L, M, N
dw nul, dc, nul, nul, nul ; O, P, Q, R, S
dw nul, nul, nul, nul, nul ; T, U, V, W, X
dw nul, nul ; Y, Z
dw nul, nul, nul, nul, nul ; a, b, c, d, e
dw hvp, nul, sm, nul, nul ; f, g, h, i, j
dw nul, rm, sgr, dsr, nul ; k, l, m, n, o
dw key, nul, nul, scp, nul ; p, q, r, s, t
dw rcp, nul, nul, nul, xoc ; u, v, w, x, y
dw nul ; z
ansi_functions proc near ; set return type to NEAR
;----- nul ---------------------------------------------
; No-action ansi sequence; called when unknown command given.
nul: ret
;----- Cursor Motion -----------------------------------------------
;-- cursor to y,x
hvp: or al, al ; First parameter is desired Y coordinate.
jz hvp_yok
dec ax ; Convert to zero-based coordinates.
hvp_yok:mov cur_y, al
; Get second parameter, if it is there, and set X with it.
xor ax, ax
cmp cx, 2 ; was there a second parameter?
jb hvp_xok
lodsb ; yes.
or al, al
jz hvp_xok
dec ax ; convert to zero-based coordinates.
hvp_xok:mov cur_x, al
; Clip to maximum coordinates.
hvp_set:
mov ax, cur_coords ; al = x, ah = y
cmp al, max_x
jbe hvp_sxok
mov al, max_x
mov cur_x, al
hvp_sxok:
cmp ah, max_y
jbe hvp_syok
mov al, max_y
mov cur_y, al
hvp_syok:
; Set values of DX and DI accordingly.
call xy_to_regs
ret
;-- cursor forward --
cfw: add cur_x, al
jmp hvp_set
;-- cursor back -----
cbk: sub cur_x, al
jae cbk_ok
mov cur_x, 0
cbk_ok: jmp hvp_set
;-- cursor down -----
cdn: add cur_y, al
jmp hvp_set
;-- cursor up -------
cup: sub cur_y, al
jae cup_ok
mov cur_y, 0
cup_ok: jmp hvp_set
;-- save cursor position --------------------------------------
scp: mov ax, cur_coords
mov saved_coords, ax
ret
;-- restore cursor position -----------------------------------
rcp: mov ax, saved_coords
mov cur_coords, ax
jmp hvp_set ; Clip in case we have switched video modes.
;-- set graphics rendition ------------------------------------
; Modifies the color in which new characters are written.
sgr: dec si ; get back pointer to first parameter
or cx, cx ; Did he give any parameters?
jnz sgr_loop
mov byte ptr [si], 0 ; no parameters, so fake
inc cx ; one with the default value.
; For each parameter
sgr_loop:
lodsb ; al = next parameter
; Search color table
push cx
mov cx, colors
mov bx, offset color_table-3
sgr_search:
add bx, 3
cmp al, byte ptr [bx]
loopnz sgr_search ; until match found or done
jnz sgr_loopx
; If parameter named a known color, set the current
; color variable.
mov ax, [bx+1]
and cur_attrib, al
or cur_attrib, ah
sgr_loopx:
pop cx
loop sgr_loop ; until no more parameters.
ret
;-- erase in line ----------------------------------------
; Uses BIOS to scroll away a one-line rectangle
eil: push dx
mov cx, cur_coords
mov dh, ch
jmp short scrollem
;-- erase in display -------------------------------------
; Uses BIOS to scroll away all of display
eid: cmp al, 2
jnz eid_ignore ; param must be two
if cls_homes_too
mov cur_coords, 0
call xy_to_regs
endif
push dx
xor cx, cx
mov dh, max_y
scrollem:
call get_blank_attrib
mov bh, ah
mov dl, max_x
mov ax, 600h
int 10h
pop dx
eid_ignore:
ret
;-- device status report --------------------------------
; Stuffs an escape, a left bracket, current Y, semicolon, current X,
; a capital R, and a carriage return into input stream.
; The coordinates are 1 to 3 decimal digits each.
dsr: push di
push dx
push es
mov ax, cs
mov es, ax
std ; Store string in reversed order for fun
mov di, offset cpr_esc - 2
mov al, cur_y
inc al ; convert to one-based coords
call byteout ; row
mov al, ';' ; ;
stosb
mov al, cur_x
inc al ; convert to one-based coords
call byteout ; column
mov al, 'R' ; R ANSI function 'Cursor Position Report'
stosb
mov al, 13
mov word ptr cprseq.adr, di ; save pointer to last char in string
stosb ; send a carriage return, too
mov ax, offset cpr_esc
sub ax, di ; ax is # of characters in string
mov word ptr cprseq.len, ax ; pass info to the getchar routine
cld
pop es
pop dx
pop di
ret
;-- keyboard reassignment -------------------------------
; Key reassignment buffer is between param_end and redef_end+2, exclusive.
; When it shrinks or grows, param_end is moved.
; Format of an entry is as follows:
; highest address -> length:word (may be 0)
; key to replace:word (either hi or low byte is zero)
; .
; . new key value, "length" bytes long
; .
; lowest address -> next entry, or free space.
; If no arguments are given, keyboard is reset to default condition.
; Otherwise, first parameter (or first two, if first is zero) defines
; the key whose value is to be changed, and the following parameters
; define the key's new, possibly zero-length, value.
key:
; Is this a reset?
or cx, cx
jz key_init
; Get the first (or first two) parameters
cld
dec si ; point to first param
dec cx ; Assume it's a fn key, get two params
dec cx
lodsw
or al, al ; Is it a function key?
jz key_fnkey
; It's not a function key- put second param back
inc cx
dec si
key_fnkey:
; Key to redefine now in AX. If it's already redefined,
; lookup will set Z, point SI to redef string, set CX to its length.
push di
push es
push cx
push si
std ; moving up, must move from top down
push ds
pop es ; string move must have ES=DS
call lookup ; rets Z if redefined...
jnz key_newkey
; It's already defined. Erase its old definition- i.e., move
; region param_end+1..SI-1 upwards CX+4 bytes, add CX+4 to param_end.
add cx, 4
mov bp, param_end ; save old value in bp...
add param_end, cx
dec si ; start at (SI-1)
mov di, si
add di, cx ; move to (start + CX+4)
mov cx, si
sub cx, bp ; length of region old_param_end+1..start
rep movsb
key_newkey:
; Key not redefined. See if there's enough room to redefine it.
pop si ; get back pointer to redef string
pop cx ; get back number of bytes in redef string
mov di, param_end ; hi byte of new redef record, hi byte of len
sub di, 4 ; hi byte of new data field
mov bx, di
sub bx, cx ; hi byte of remaining buffer space
sub bx, 16 ; better be at least 16 bytes room
cmp bx, param_buffer
jb key_popem ; nope- forget it.
; Nothing in the way now!
mov [di+3], cx ; save length field
mov [di+1], ax ; save name field
jcxz key_nullstring
key_saveloop: ; save data field
movsb
add si, 2 ; input string ascending, output descending
loop key_saveloop
key_nullstring:
mov param_end, di ; save adr of new hi byte of free area
key_popem:
pop es
pop di
key_exit:
cld
ret
key_init:
; Build the default redefinition table:
; control-printscreen -> control-P
push es
push ds
pop es
std
mov di, redef_end
mov ax, 1
stosw
mov ax, 7200h ; control-printscreen
stosw
mov al, 16 ; control P
stosb
mov param_end, di ; save new bottom of redef table
pop es
jmp key_exit
;---- Delete/Insert Lines -------------------------------
; AL is number of lines to delete/insert.
; Preserves DX, DI; does not move cursor.
d_l: ; Delete lines.
mov ah, 6 ; BIOS: scroll up
jmp short il_open
il: ; Insert lines.
mov ah, 7 ; BIOS: scroll down
il_open:
; Whether inserting or deleting, limit him to (max_y - cur_y) lines;
; if above that, we're just clearing; set AL=0 so BIOS doesn't burp.
mov bh, max_y
sub bh, cur_y
cmp al, bh
jbe il_ok ; DRK 9/4...
mov al, 0 ; he tried to move too far
il_ok:
push ax
call get_blank_attrib
mov bh, ah ; color to use on new blank areas
pop ax ; AL is number of lines to scroll.
mov cl, 0 ; upper-left-x of data to scroll
mov ch, cur_y ; upper-left-y of data to scroll
push dx
mov dl, max_x ; lower-rite-x
mov dh, max_y ; lower-rite-y (zero based)
int 10h ; call BIOS to scroll a rectangle.
pop dx
ret ; done.
;-- Insert / Delete Characters ----------------------------
; AL is number of characters to insert or delete.
; Preserves DX, DI; does not move cursor.
ic: mov ch, 1 ; 1 => swap dest & source below
jmp short dc_ch
dc: mov ch, 0
dc_ch:
call in_g_mode
jnc dc_ret ; | if in graphics mode, ignore.
; AL = number of chars to ins or del (guarenteed nonzero).
; Limit him to # of chars left on line.
cmp al, dl
jbe dc_cok
mov al, dl
dc_cok:
push di ; DI is current address of cursor
xchg ax, cx ; CX gets # of chars to ins/del
mov bp, cx ; BP gets # of columns to clear.
; Set up source = destination + cx*2, count = dx - cx
mov ch, 0 ; make it a word
mov si, di
add si, cx
add si, cx
neg cl
add cl, dl
mov ch, 0 ; CX = # of words to transfer
cld ; REP increments si & di
; If this is an insert, then flip transfer around in both ways.
test ah, 1
jz dc_noswap
xchg di, si ; source <-> dest
std ; up <-> down
mov ax, cx ; make move over same range
dec ax
add ax, ax ; AX=dist from 1st to last byte.
add di, ax ; Start transfer at high end of block
add si, ax ; instead of low end.
dc_noswap:
; Move those characters.
push es
pop ds
rep movsw
mov cx, bp
; Figure out what color to make the new blanks.
call get_blank_attrib
mov al, ' '
; Blank out vacated region.
rep stosw
; All done.
cld ; restore normal REP state and
pop di ; cursor address.
dc_ret: ret
;---- set / reset mode ---------------------------------------
; Sets graphics/text mode; also sets/resets "no wrap at eol" mode.
sm: mov cl, 0ffh ; set
sm_rs:
; Is it "wrap at eol" ?
cmp al, 7
jnz sm_notwrap
mov wrap_flag, cl ; true = wrap at EOL
jmp short sm_done
sm_notwrap:
; Is it "set highest number of screen lines available"?
cmp al, 43
jnz sm_video
; Only valid for the Enhanced Graphics Adaptor on
; a monochrome display or an enhanced color display.
; Test presence of EGA by calling BIOS fn 12h.10h.
mov ah, 12h
mov bx, 0ff10h
int 10h ; bh=0-1, bl=0-3 if EGA
test bx, 0FEFCH
jnz sm_done ; sorry, charlie
; mov port_6845, 3d4h
; mov al, video_mode
; and al, 7
; cmp al, 7 ; monochrome monitor?
; jnz sm_colormon
; mov byte ptr port_6845, low(3b4h)
;sm_colormon:
; 43 line mode only allowed in text modes, for now.
call in_g_mode
jnc sm_done
mov ah, 0 ; "Set video mode"
mov al, video_mode ; Re-init current mode
int 10h
mov ax,1112h ; Load 8x8 font
mov bl,0 ; (instead of 8x14)
int 10h
mov ax, 1200h ; Load new printscreen
mov bl, 20h
int 10h
mov ah,1
mov cx,0707h ; (Load cursor scan lines)
int 10h
; | Patch; this gotten by painful observation of
; | IBM's professional editor. I think there's a
; | documented bug in Video Bios's "load cursor scan line"
; | call; try looking in latter 1985 PC Tech Journal.
mov dx, port_6845 ; '6845' command reg
mov al, 10
out dx, al
jmp $+2
inc dx
mov al, 7
out dx, al ; set cursor start line
; Assume that gets us 43 lines.
mov max_y, 42
jmp short sm_home
sm_video:
; It must be a video mode. Call BIOS.
mov ah, 0 ; "set video mode"
int 10h
; Assume that gets us 25 lines.
mov max_y, 24
sm_home:
; Read the BIOS buffer address/cursor position variables.
mov ax, abs40
push ds
mov ds, ax
assume ds:abs40
; Find current video mode and screen size.
mov ax,word ptr crt_mode ; al = crt mode; ah = # of columns
pop ds
mov video_mode, al
dec ah ; ah = max column
mov max_x, ah
; Since cursor may end up in illegal position, it's best to
; just go home after switching video modes.
mov cur_coords, 0
call xy_to_regs
sm_done:
ret
rm: mov cl, 0 ; reset
jmp sm_rs
;------- Output Character Translation ----------------------
; A decidedly nonstandard function, possibly useful for editing files
; intended to be printed by daisywheel printers with strange wheels.
; (The letter 'y' was chosen to conflict with the VT100 self-test command.)
; Usage: ESC [ #1;#2 y
; where #1 is the character to redefine
; #2 is the new display value
; If only ESC [ #1 y is sent, character #1 is reset to its default value.
; If only ESC [ y is sent, the entire table is reset to the default value.
; (If only ESC [ #1; y is sent, character #1 is set to zero... sigh.)
xoc: ; Xlate output character
mov bx, xlate_tab_ptr
jcxz xoc_reset ; if no parameters, reset table to 1:1
dec si ; point to first parameter
lodsw ; first parameter to AL, second to AH
dec cx ; is parameter count 1?
jnz xoc_bothparams
mov ah, al ; if only one param, reset that char.
xoc_bothparams:
add bl, al
adc bh, 0 ; bx points to entry for char AL
mov byte ptr [bx], ah ; change that entry
xoc_done:
ret
xoc_reset:
; Fill table with default values- i.e. 0, 1, 2, ... 255.
xor ax, ax
xoc_loop:
mov byte ptr [bx], al
inc bx
inc al
jnz xoc_loop
jmp xoc_done
ansi_functions endp ; end dummy procedure block
;-------- Color table -----------------------------------------
; Used in "set graphics rendition"
colors equ 22 ; number of colors in table
color_table:
db 0, 000h,07h ; all attribs off; normal.
db 1, 0ffh,08h ; bold
db 4, 0f8h,01h ; underline
db 5, 0ffh,80h ; blink
db 7, 0f8h,70h ; reverse
db 8, 088h,00h ; invisible
db 30,0f8h,00h ; black foreground
db 31,0f8h,04h ; red
db 32,0f8h,02h ; green
db 33,0f8h,06h ; yellow
db 34,0f8h,01h ; blue
db 35,0f8h,05h ; magenta
db 36,0f8h,03h ; cyan
db 37,0f8h,07h ; white
db 40,08fh,00h ; black background
db 41,08fh,40h ; red
db 42,08fh,20h ; green
db 43,08fh,60h ; yellow
db 44,08fh,10h ; blue
db 45,08fh,50h ; magenta
db 46,08fh,30h ; cyan
db 47,08fh,70h ; white
code ends
end ; of nansi_f.asm
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