;*************************************************************** ;* Show87 - (C) Copyright 1988, 1989 by Borland International * ;* VIDEO2.INC - Include module for Show87 * ;*************************************************************** ; ;============================================================================= ; High Level Video Routines ; ; These are routines to display formatted text strings. All registers are ; preserved except those used to return parameters. All parameters are passed ; through the registers. VIDEO1.INC must be included in the source code. ; VIDEO_INIT must be called before any of these routines. It is assumed that ; DS = ES = CS. ; ;=========================================================================== ; Global data. ;--- display attributes Video_Norm db 07h ;normal Video_Emph db 02h ;emphasized (underline) Video_High db 70h ;highlight (reverse video) Video_Bold db 0fh ;bold (intense) ;--- attribute stack Video_AtrM equ 10 ;maximum stack entries (n > 0) Video_AtrN dw 0 ;present stack number Video_AtrS db 07h ;start of stack DD Video_AtrM, ? ;rest of stack ;--- string formatting controls FrmEnd equ 0 ;end of string FrmCtl equ 1 ;control character mask FrmNorm equ 2 ;switch to normal attribute FrmEmph equ 3 ;switch to emphasized FrmHigh equ 4 ;switch to highlight FrmBold equ 5 ;switch to bold FrmAtr equ 6 ;user defined attribute FrmPush equ 7 ;push the present attribute FrmPop equ 8 ;pop an attribute FrmHor equ 9 ;horizontally repeated character ; (left to right) FrmVer equ 10 ;vertically repeated character ; (up to down) FrmStr equ 11 ;nested string FrmLoc equ 12 ;locate cursor Video_StrM equ 10 ;maximum nested strings ;================================================ ; Write a formatted string. Note: uses (32 = ; Video_AtrM * 2 + 14) stack bytes. ; ; In: si= string location. ;================================================= ; Video_Wstr proc near pushf push ax push bx push cx push dx push di push si push bp sub sp, Video_AtrM * 2 + 2 ;room for local data mov bp, sp cld mov word ptr [bp], 0 ;clear nested string stack mov di, Video_AtrN ;get the present stack number mov bl, [Video_AtrS + di] ;get attribute ;--- loop for each byte in the string Vidwst1 : lodsb ;get the next byte cmp al, FrmEnd ;check if end of string je Vidwst5 cmp al, 32 ;check if control character jb Vidwst2 call Video_Wchr ;write character jmp Vidwst1 ;--- control character Vidwst2 : mov di, offset Video_Ftab ;location of table Vidwst3 : cmp byte ptr [di], -1 ;check if end of table je Vidwst1 ;jump if so, ignore this ; character cmp al, [di] ;check if match command je Vidwst4 ;jump if so, call command ; routine add di, 3 ;next location jmp Vidwst3 ;loop back until end of table ; or match Vidwst4 : call word ptr [di + 1] ;call the routine jmp Vidwst1 ;--- check if within nested string Vidwst5 : mov ax, [bp] ;get the number or ax, ax ;check if any entries jz Vidwst6 dec ax ;reduce count mov [bp], ax ;save it mov di, ax shl di, 1 ;times two mov si, [bp + 2 + di] ;get the saved offset jmp Vidwst1 ;continue ;--- finished, save the attribute in the attribute stack Vidwst6 : mov di, Video_AtrN ;get the present stack number mov [Video_AtrS + di], bl ;save attribute add sp, Video_AtrM * 2 + 2 ;fix stack pop bp pop si pop di pop dx pop cx pop bx pop ax popf ret endp ;Video_Wfstr ;------------------------------------------------ ; This is the table to access the formatting ; routines below. The table consists of a format ; command byte followed by the 16 bit address of ; the routine to handle the command. The table ; is terminated with a -1 (FFH). ;------------------------------------------------- Video_Ftab label Byte db FrmCtl dw offset Vidwstr1 db FrmNorm dw offset Vidwstr2 db FrmEmph dw offset Vidwstr3 db FrmHigh dw offset Vidwstr4 db FrmBold dw offset Vidwstr5 db FrmAtr dw offset Vidwstr6 db FrmPush dw offset Vidwstr7 db FrmPop dw offset Vidwstr8 db FrmHor dw offset Vidwstr9 db FrmStr dw offset Vidwstr10 db FrmLoc dw offset Vidwstr11 db FrmVer dw offset Vidwstr12 db -1 ;------------------------------------------------ ; These are the individual routines to handle ; the special formatting commands. ;--- control character mask Vidwstr1 proc near lodsb ;get the character call Video_Wchr ;display ret endp ;--- normal attribute Vidwstr2 proc near mov bl, Video_Norm ;set to normal attribute ret endp ;--- emphasized attribute Vidwstr3 proc near mov bl, Video_Emph ;set to normal attribute ret endp ;--- highlighted attribute Vidwstr4 proc near mov bl, Video_High ;set to normal attribute ret endp ;--- bold attribute Vidwstr5 proc near mov bl, Video_Bold ;set to normal attribute ret endp ;--- user defined attribute Vidwstr6 proc near lodsb ;get the attribute mov bl, al ;set attribute ret endp ;--- push the present attribute Vidwstr7 proc near mov ax, Video_AtrN ;get the present stack number cmp ax, Video_AtrM - 1 ;check if stack full jae Vidwstr71 mov di, ax ;load index mov [Video_AtrS + di], bl ;save the present attribute inc ax ;increment stack mov Video_AtrN, ax ;save it Vidwstr71 : ret endp ;--- pop an attribute Vidwstr8 proc near mov ax, Video_AtrN ;get the present stack number or ax, ax ;check if at bottom jz Vidwstr81 dec ax ;reduce stack number mov di, ax ;load index mov bl, [Video_AtrS + di] ;set the present attribute mov Video_AtrN, ax ;save stack number Vidwstr81 : ret endp ;--- repeat display a character Vidwstr9 proc near lodsb ;get the character push ax lodsb ;load the count mov cl, al sub ch, ch ;count in cx pop ax call Video_Wchrs ;display characters ret endp ;--- nested string Vidwstr10 proc near lodsw ;get the offset cmp word ptr [bp], Video_StrM ;check if stack full je Vidwstr101 mov di, [bp] ;stack entries shl di, 1 ;times two mov [bp + 2 + di], si ;save present location inc word ptr [bp] ;increment entries mov si, ax ;new string location Vidwstr101 : ret endp ;--- cursor move Vidwstr11 proc near lodsw ;load location xchg ah, al ;get row and column in right ; register halves mov dx, ax call Video_Cset ;set cursor location ret endp ;--- vertically repeated character Vidwstr12 proc near lodsb ;get the character push ax lodsb ;load the count mov cl, al sub ch, ch ;count in cx pop ax call Video_Cget ;get the cursor location Vidwstr121 : push dx call Video_Wchr ;display character pop dx inc dh ;next row call Video_Cset ;set the cursor location loop Vidwstr121 ret endp ;================================================ ; Calculate the horizontal length of the text in ; a formatted string. Note: uses (32 = ; Video_AtrM * 2 + 10) stack bytes. Used for ; justifying strings. ; ; In: si= string location. ; ; Out: bx= length. ;================================================== ; Video_Scnt proc near push ax push di push si push bp sub sp, Video_AtrM * 2 + 2 ;room for local data mov bp, sp sub bx, bx ;clear the count mov word ptr [bp], 0 ;clear nested string stack ;--- loop for each byte in the string Vidscn1 : lodsb ;get the next byte cmp al, FrmEnd ;check if end of string je Vidscn8 cmp al, 32 ;check if control character jb Vidscn2 inc bx ;increment count jmp Vidscn1 ;--- control character Vidscn2 : cmp al, FrmCtl jne Vidscn3 inc si ;skip character inc bx ;add to total jmp Vidscn1 ;--- user attribute Vidscn3 : cmp al, FrmAtr jne Vidscn4 inc si ;skip attribute byte jmp Vidscn1 ;--- horizontal repeated byte Vidscn4 : cmp al, FrmHor jne Vidscn5 inc si ;skip character lodsb ;load length sub ah, ah add bx, ax ;add to total jmp Vidscn1 ;--- nested string Vidscn5 : cmp al, FrmStr jne Vidscn6 call Vidwstr10 ;start nested string jmp Vidscn1 ;--- cursor move Vidscn6 : cmp al, FrmLoc jne Vidscn7 inc si inc si ;skip location jmp Vidscn1 ;--- vertical repeated byte Vidscn7 : cmp al, FrmVer jne Vidscn1 inc si inc si ;skip byte and count inc bx ;add one for the first byte jmp Vidscn1 ;--- check if within nested string Vidscn8 : mov ax, [bp] ;get the number or ax, ax ;check if any entries jz Vidscn9 dec ax ;reduce count mov [bp], ax ;save it mov di, ax shl di, 1 ;times two mov si, [bp + 2 + di] ;get the saved offset jmp Vidscn1 ;continue ;--- finished Vidscn9 : add sp, Video_AtrM * 2 + 2 ;fix stack pop bp pop si pop di pop ax ret endp ;Video_Scnt ;================================================ ; Write a string padded with some character on ; both sides. ; ; In: si= string location; al= pad character; ; bx= left side pad number; cx= right side pad ; number. ;================================================== ; Video_Wstrp proc near push bx push cx push di mov di, Video_AtrN ;get the present stack number push cx mov cx, bx mov bl, [Video_AtrS + di] ;get attribute call Video_Wchrs ;write preceding spaces call Video_Wstr ;write string pop cx mov bl, [Video_AtrS + di] ;get attribute call Video_Wchrs ;write following spaces pop di pop cx pop bx ret endp ;Video_Wstrp ;================================================ ; Write a left justified string. ; ; In: si= string location; al= pad character; ; cx= total column width. ;=============================================== ; Video_Wstrl proc near pushf cld push bx push cx call Video_Scnt ;get string width cmp bx, cx ;check if too big jbe Vidwsl1 mov bx, cx ;set to maximum length Vidwsl1 : sub cx, bx ;get difference sub bx, bx ;no padding in front call Video_Wstrp ;print with padding pop cx pop bx popf ret endp ;Video_Wstrl ;================================================ ; Write a right justified string. ; ; In: si= string location; al= pad character; ; cx= total column width. ;================================================== ; Video_Wstrr proc near pushf cld push bx push cx call Video_Scnt ;get string width cmp bx, cx ;check if too big jbe Vidwsr1 mov bx, cx ;set to maximum length Vidwsr1 : sub cx, bx ;get difference mov bx, cx ;padding is before sub cx, cx ;no padding after call Video_Wstrp ;print with padding pop cx pop bx popf ret endp ;Video_Wstrr ;================================================ ; Write a center justified string. ; ; In: si= string location; al= pad character; ; cx= total column width. ;================================================= ; Video_Wstrc proc near pushf cld push bx push cx call Video_Scnt ;get string width cmp bx, cx ;check if too big jbe Vidwsc1 mov bx, cx ;set to maximum length Vidwsc1 : sub cx, bx ;get difference mov bx, cx shr bx, 1 ;divide by two, preceding pad sub cx, bx ;difference is end pad call Video_Wstrp ;print with padding pop cx pop bx popf ret endp ;Video_Wstrc