Converting MINI-BASIC in MASM over to C++?

This is a discussion on Converting MINI-BASIC in MASM over to C++? within the Projects and Job Recruitment forums, part of the Community Boards category; First of all, you may want to modify it so that it doesn't try to change the window to a ...

  1. #61
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    First of all, you may want to modify it so that it doesn't try to change the window to a size not supported, instead of giving "bad parameter".

    Whether it is valuable to change the size or not is a different matter. I kept it the way the original code was - the principle being "Make it work first - then change it around".

    I have made changes - e.g. the way that lines are kept in memory as a linked list instead of as a big chunk of text (with binary line numbers in it) is a change from the original format. In a proper C++ solution, I think a std::map<int, string> would be the right solution, but linked list was easy to implement at the spur of a moment.

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  2. #62
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    I'm working on 'EvalExpr' right now, and I think it's almost done. I'll post an update soon...



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  3. #63
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    Quote Originally Posted by Sebastiani View Post
    I'm working on 'EvalExpr' right now, and I think it's almost done. I'll post an update soon...
    Excellent.

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    Cool. Thanks.

    Paul

  5. #65
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    Hmm, I'm getting seg-faults with the PRINT routine. Any ideas, matsp?



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  6. #66
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    Quote Originally Posted by Sebastiani View Post
    Hmm, I'm getting seg-faults with the PRINT routine. Any ideas, matsp?
    Not without you telling me more? What dev-environment are you using? In visual studio, I can just click on the call-stack to see how I got there.

    Or is it segfaulting in EvalExpr?

    [You could always use dispstr() to display where you get to]

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  7. #67
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    Ah, it's because when 'NextLine' was called in 'direct' mode, BasicLine* 'current' was NULL. These changes seemed to fix the problem:

    Code:
    void DirectCommand(const char *LineBuffer)
    {
    	current = 0;
    	Execute(LineBuffer, tab1);
    }
    
    void NextLine(void)
    {	
    	if(current)
    		current = current->next;
    	if (!current)
    	{
    		Prompt();
    	}
    }



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  8. #68
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    That looks like a good change - although changing current in DirectCommand may not be the right thing, as I think you should be able to stop the code, then continue after for example printing values of variables.

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  9. #69
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    I see what you mean. Well then how about:

    Code:
    void DirectCommand(const char *LineBuffer)
    {
    	const BasicLine* saved = current;
    	current = 0;
    	Execute(LineBuffer, tab1);
    	current = saved;
    }
    Last edited by Sebastiani; 03-19-2009 at 10:23 AM. Reason: Changed to const



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  10. #70
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    I agree. I think that's a good change. It looks good.

    Paul

  11. #71
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    So what is the difference between ':' and ';' when separating commands?



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  12. #72
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    I think : is for how MINI-BASIC separates commands. I'm not sure how C++ does.

    Paul

  13. #73
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    Minor fix: changed the 'while' loop in DispNumber to a 'do/while' loop so that zero is displayed:

    Code:
    	do
    	{
    		*ptr-- = (n % 10) + '0';
    		size--;
    		n /= 10;
    	}
    	while(n);



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  14. #74
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    >> I think : is for how MINI-BASIC separates commands.

    But looking at the doc you posted, it has:

    LET A=234-5*6;A=A/2;X=A-100;@(X+9)=A-1



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  15. #75
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    I think that's an error in the document. Let me post some example code really quick:

    Windows Console Tiny Basic V.1
    Ready.
    >load castle
    Ready.
    >list
    Code:
        5 CLS
       10 PRINT "MINI-BASIC ASCII Art":PRINT
       15 PRINT"|---| |---| |---|                 |---| |---| |---|"
       20 PRINT"|   ---   ---   |                 |   ---   ---   |"
       25 PRINT"\              /                  \               /"
       30 PRINT" |            |                    |             |"
       35 PRINT" |            | |---| |---| |---|  |             |"
       40 PRINT" |            |--   ---   ---    --|             |"
       45 PRINT" |                                               |"
       50 PRINT" |                                               |"
       55 PRINT" |                                               |"
       60 PRINT" |             /------------------\              |"
       65 PRINT" |             |[][][][][][][][][]|              |"
       70 PRINT" |             |[][][][][][][][][]|              |"
       75 PRINT" |             |[][][][][][][][][]|              |"
       80 PRINT" |             |[][][][][][][][][]|              |"
       85 PRINT" |             |[][][][][][][][][]|              |"
       90 PRINT" -------------------------------------------------"
       95 PRINT"Castle by dunric"
    Ready.
    >

    Notice the ":" in line 10. So it has to be ":" and not ";". Otherwise it would be a syntax error.

    Paul

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