struct(macro argument)

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jumpex

Joined: 29 Jan 2006
Posts: 38

jumpex

Simple question that I couldn't find an answer for.

Code:

[...]
stem SYSTEMTIME
[...]
invoke GetLocalTime,stem
[...]
macro tim tst
{
 [...]
 xor eax,eax
 mov ax,[tst.wDay]
 [...]
}

Quote:

Error: undefined symbol 'tst.wDay'.

If I use [stem] in the macro directly - it works.
How do I pass the structure as an argument to it?

27 Jul 2010, 14:12

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18486
Location: In your JS exploiting you and your system

revolution

Use the hash:

Code:

mov ax,[tst#.wDay]

27 Jul 2010, 14:25

jumpex

Joined: 29 Jan 2006
Posts: 38

jumpex

Yes. That worked. #

Now why didn't I find that anywhere?
If you don't have a source where I can read about it (which I am sure you will, but) - how does it work?

27 Jul 2010, 14:34

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18486
Location: In your JS exploiting you and your system

revolution

http://flatassembler.net/docs.php?article=manual#2.3.3 wrote:

Inside macroinstruction also special operator # can be used. This operator causes two names to be concatenated into one name. It can be useful, because it's done after the arguments and local names are replaced with their values.

27 Jul 2010, 14:51

jumpex

Joined: 29 Jan 2006
Posts: 38

jumpex

Now I remember.
Thank you.

27 Jul 2010, 14:53

jumpex

Joined: 29 Jan 2006
Posts: 38

jumpex

It's offtopic, but it's too small of a question to start a new thread about.

Code:

[...]
lamb rb 128
[...]
;do something with lamb
mov dword[lamb],0
[...]

I want to "clear" [lamb], as I append strings to it.
Is this a correct way to do so?
If not - what is the correct way?

Again - sorry for the offtopic.

27 Jul 2010, 21:29

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18486
Location: In your JS exploiting you and your system

revolution

Do you want to clear (set to zero) the entire 128 bytes? Are you using null terminated strings?

27 Jul 2010, 21:35

jumpex

Joined: 29 Jan 2006
Posts: 38

jumpex

Yes. Yes.

27 Jul 2010, 22:13

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18486
Location: In your JS exploiting you and your system

revolution

Since you are using null terminated strings then this will suffice:

Code:

mov [lamb],0

There is no need to clear the entire array, the first zero is enough.

27 Jul 2010, 22:23

jumpex

Joined: 29 Jan 2006
Posts: 38

jumpex

Thanks.
You've been very helpful.

27 Jul 2010, 22:26

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