66 lines
1012 B
C++
66 lines
1012 B
C++
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/* Turbo C - (C) Copyright 1987 by Borland International */
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#pragma inline
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void far movescreenmem(char far *source, char far *dest, unsigned len,
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int snowcheck)
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/* Moves screen memory, doing snow control if necessary. */
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{
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unsigned char right;
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asm push ds
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asm push es
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right = ((unsigned long)source < (unsigned long)dest);
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asm mov bh,snowcheck
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asm lds si,source
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asm les di,dest
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asm mov cx,len
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asm cmp cx,0
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asm je j9
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asm mov al,right
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asm cmp al,1
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asm je j1
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asm cld
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asm jmp short j4
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j1:
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asm cmp bh,1
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asm je j2
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asm add si,cx
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asm sub si,2
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asm add di,cx
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asm sub di,2
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asm jmp short j3
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j2:
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asm add si,cx
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asm dec si
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asm add di,cx
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asm dec di
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j3:
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asm std
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j4:
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asm cmp bh,1
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asm jne j7
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asm mov dx,3DAh
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j5:
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asm in al,dx
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asm rcr al,1
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asm jb j5
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asm cli
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j6:
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asm in al,dx
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asm rcr al,1
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asm jnb j6
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asm movsb
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asm sti
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asm loop j5
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asm jmp short j9
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j7:
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asm shr cx,1
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j8:
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asm movsw
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asm loop j8
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j9:
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asm pop es
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asm pop ds
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}
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