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- ;void string_line_b(strg,dir,col,row,length,color);
- ; unsigned char *strg,dir,col,row,length,color;
-
- EXTRN _memory_model:byte
- EXTRN _video_page:byte
-
- _TEXT SEGMENT BYTE PUBLIC 'CODE'
- ASSUME CS:_TEXT
- PUBLIC _string_line_b
- _string_line_b proc near
- push bp ;
- mov bp,sp ;set stack frame
- push di ;
- push si ;
- cmp _memory_model,0 ;near or far?
- jle begin ;jump if near
- inc bp ;else add 2 to BP
- inc bp ;
- begin: push ds ;save DS
- mov bh,_video_page ;set video page
- cmp _memory_model,2 ;data near or far?
- jb L0 ;jump if near
- lds si,dword ptr[bp+4] ;DS:SI pts to Strg
- inc bp ;add 2 to BP since dword ptr
- inc bp ;
- jmp short L00 ;
- L0: mov si,[bp+4] ;
- L00: mov [bp+4],si ;move Strg ptr in FAR case
- mov dl,[bp+8] ;Col in DL
- dec dl ;count from 0
- mov dh,[bp+10] ;Row in DH
- dec dh ;count from 0
- mov ah,2 ;function to set cursor
- int 10h ;set cursor to line
- sub cx,cx ;
- mov cl,[bp+12] ;string length in DI
- mov di,cx ;
- or di,di ;test for zero
- jz L6 ;quit if zero
- mov bl,[bp+14] ;attribute in BL
- cmp byte ptr[si],0 ;test for null string
- je L6 ;
- mov cx,1 ;number chars to write in function
- L1: mov al,[si] ;get char from Strg
- inc si ;forward Strg ptr for next time
- cmp al,0 ;end of Strg?
- jne L2 ;jump if not
- mov si,[bp+4] ;set ptr back to start
- jmp short L1 ;restart
- L2: mov ah,9 ;function to write char
- int 10h ;write it
- dec di ;dec length counter
- or di,di ;zero yet?
- jz L6 ;quit if zero
- L3: mov ah,[bp+6] ;get direction param
- cmp ah,'V' ;write vertically?
- je L4 ;jump ahead if so
- cmp ah,'v' ;test for small 'v'
- je L4 ;jump if small 'v'
- inc dl ;inc col number
- jmp short L5 ;jump ahead
- L4: inc dh ;inc row number
- L5: mov ah,2 ;function to set cursor
- int 10h ;reset cursor
- jmp short L1 ;go write next
- L6: pop ds ;
- pop si ;
- pop di ;
- pop bp ;
- cmp _memory_model,0 ;quit
- jle quit ;
- db 0CBh ;RET far
- quit: ret ;RET near
- _string_line_b endp
- _TEXT ENDS
- END