MASM Macro Text Code Line

[BolterVi]

Hello,

I was wondering if it's possible to receive the text of a specific code line with macros as string.

As example (Just random code):

Code Select Expand


1. mov eax, 4
2. cmp eax, 5
3. jb @F
4. sub eax, 1
5. ...


and with a macro i can receive the code line as text like

Code Select Expand


m1 macro
    LOCAL t
    t CATSTR <Line 4:>, $-X
    echo t
endm


where $-X stands for the desired line.
The output should be something like:

Code Select Expand


Line 4:sub eax, 1


Just wondering if something like that is possible, if not it's okay.

Regards,
BolterVi

[jj2007]

Hi BolterVi,

Welcome to the forum :icon14:

To my knowledge, that is not possible. But if your goal is to display certain lines of your source, or to analyse your sources, there are plenty of other ways to do it. Simple example:

include \masm32\MasmBasic\MasmBasic.inc      ; download
  Init
  Recall "MySource.asm", L$()      ; load a textfile into a string array
  Inkey "Line 4: ", L$(4)          ; print line 4 and wait for a key
EndOfCode

What exactly do you want to achieve?

[BolterVi]

Hey!

Thanks for your fast reply. :)

I thought about creating a small packer/obfusactor by using macros.
As example there would be mutation macros

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MUTATION_START
;Example code here:
xor ecx, ecx
@@:
;something here..
inc ecx
cmp ecx, 5
jb @B
MUTATION_END


and the code between those macros is getting mutated.
This was just an idea flying around in my head :)