Little memdump

[David L.Davis]

Tom Wrote:

> Hi people,
> 
>    I just wanted to share with you a *very-humble* memdump procedure 
> that has been very helpful to me in my tedious D-debugging nights.
> 
> Kind regards,
> --
> Tom;
> 

Hi Tom,

    Thanks for sharing your useful code...hope you don't mind that I've replaced the 'C' printf()s with 'D' writef()s functions, and added some test data to it.

// To compile the test example: dmd memdump.d -version=memdump
// To compile: dmd MySource.d memdump.d
private import io = std.stdio;

void memdump(void* from, uint length)
{
    uint   plen = 0;
    ubyte* adr(uint i) { return cast(ubyte*)from + i + plen; }
    char   chr(uint i) 
    { return cast(char)*(cast(ubyte*)from + i + plen); }
    ubyte  byt(uint i) 
    { return cast(ubyte)*(cast(ubyte*)from + i + plen); }
    char   c = '\0';
    
    while (length > 0) 
    {                
        io.writef("+-----------+-----------+-----------+-----------+\n|");
        
        for (uint i = 0; i < 16; i += 4) 
            io.writef("0x%0.8X |", adr(i));
                
        io.writef("\n|");
                
        for (uint i = 0, j = 0; i < 16; i++, j = (j + 1) % 4) 
        {
            if (i < length) 
            {
            	c = chr(i);
            	
                if (c < 14 || c > 127) 
                    io.writef("  "); 
                else 
                    io.writef(" %s", chr(i)); 
            } 
            else
                io.writef("  ");
                                
            if (j == 3) 
                io.writef("|"); 
            else 
                io.writef(" ");
        }
                
        io.writef("\n|");
        
        for (uint i = 0, j = 0; i < 16; i++, j = (j + 1) % 4) 
        {
            if (i < length)
                io.writef("%0.2X", byt(i));
            else
                io.writef("  ");
                                
            if (j == 3) 
                io.writef("|"); 
            else 
                io.writef(" ");
        }
        
        io.writef("\n");

        if (length > 16)
            length -= 16;
        else
            length = 0;

        plen += 16;
    }
    
    io.writef("+-----------+-----------+-----------+-----------+\n");
}

version(memdump)
{
void main()
{
    char[]  s = 
        "This is a text message for memdump to use as test data.";

    ubyte[] b = [0x4D, 0x5A, 0x60, 0x00, 0x01, 0x00, 0x00, 0x00, 
                      0x04, 0x00, 0x10, 0x00, 0xFF, 0xFF, 0x00, 0x00,
                      0xFE, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 
                      0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                      0x52, 0x65, 0x71, 0x75, 0x69, 0x72, 0x65, 0x73, 
                      0x20, 0x57, 0x69, 0x6E, 0x33, 0x32, 0x00, 0x00];

    io.writefln("dump string data...");                 
    memdump(cast(void*)s, s.length);
    io.writefln();
    
    io.writefln("dump binary data...");
    memdump(cast(void*)b, b.length);
}
}

Take Care,
    David L.