convert dq to asc integer

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magicSqr

Joined: 27 Aug 2011
Posts: 105

magicSqr 13 Sep 2011, 17:20

Hi,

I don't want to go and re-invent the wheel. I generate some dq unsigned integers and want to save them to file as ascii base 10 numbers

i.e. 0x123456789ABCDEF0 -> 0x31, 0x33, 0x31, 0x31, 0x37, 0x36, 0x38, 0x34, 0x36, 0x37, 0x34, 0x36, 0x33, 0x37, 0x39, 0x30, 0x33, 0x32, 0x30

so that the file reads 1311768467463790320

can someone point me to either an existing function or a method for doing it without the fpu?

thanks

magic²

13 Sep 2011, 17:20

Goplat

Joined: 15 Sep 2006
Posts: 181

Goplat 13 Sep 2011, 17:30

Windows's printf function can do this; the %I64u format prints an unsigned 64-bit integer.

13 Sep 2011, 17:30

magicSqr

Joined: 27 Aug 2011
Posts: 105

magicSqr 13 Sep 2011, 17:39

thanks for the quick reply Wink

can it do this to file ?

I don't know the syntax of printf in fasm

If my value was stored in dq mVal and the file was myFile how would I write it?

thanks again

13 Sep 2011, 17:39

magicSqr

Joined: 27 Aug 2011
Posts: 105

magicSqr 13 Sep 2011, 18:41

It's ok now.

Think I had brain-freeze.

Couldn't think how I could divide qword, lol

Code:


myVal   dq 0x5943DD1690A03A14           ; 6432227781800638996
buff    db 30 dup ?

        mov     eax, dword [myVal+4]
        mov     ebx, dword [myVal]
        mov     ecx, 10
        xor     edx, edx
        mov     edi, buff+28
        mov     byte [edi+1], 0         ;zero terminator
    @@:
        div     ecx
        xchg    eax, ebx
        div     ecx
        xchg    eax, ebx
        add     dl, 0x30
        mov     [edi], dl
        xor     dl, dl
        dec     edi
        or      eax, eax
        jnz     @b
        or      ebx, ebx
        jnz     @b
        inc     edi
        int3

I'm sure you can all write it more succinctly, but it works for my needs :O)

13 Sep 2011, 18:41

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