Make FASM understand "C" typedefs

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alorent

Joined: 05 Dec 2005
Posts: 221

alorent 15 Feb 2011, 18:55

Hello,

I was wondering if it's possible to create a macro to fully understand C typedefs. I use some code that shares the same structure in a C module and in a FASM module, so it would be great if I can just define the typedef once. For example:

Code:

typedef struct sMyStruct
{
   DWORD   p1;
   BYTE       p2;
   char*      p3;
} MY_STRUCT;

We could define in another file a possible EQU to make "char*" equal to "dd", DWORD -> dd, BYTE -> db, etc.

So, the above will generate in FASM:

Code:

MY_STRUCT struct
  p1 dd 0
  p2 db 0
  p3 dd 0
MY_STRUCT ends

I'm not sure if it's possible or that format will colapse with FASM macros internals.

Thanks!

15 Feb 2011, 18:55

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 15 Feb 2011, 19:01

Code:

  DWORD   p1;

You need to convert that to something like:

Code:

 .p1 rd 1

So a simple EQU can't do that. I think you would need to define DWORD as a macro.

As for char*, well you can make char a macro and have it search for the presence or absence of * and make the define accordingly.

15 Feb 2011, 19:01

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 15 Feb 2011, 19:07

revolution, thanks for the fast reply.

So, you think that it's imposible to make it in a way that C also understand the structure?

That is, if I change things for FASM, the C module might not understand the "typedef".

Thanks!

15 Feb 2011, 19:07

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 15 Feb 2011, 19:09

I don't know about the impossibility or not. Actually, I was trying to offer suggestions to help you to get it working.

15 Feb 2011, 19:09

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20299
Location: In your JS exploiting you and your system

revolution 15 Feb 2011, 19:11

Code:

macro DWORD var { .#var rd 1}
macro char param {match * y,param \{ ... \} }

15 Feb 2011, 19:11

edfed

Joined: 20 Feb 2006
Posts: 4330
Location: Now

edfed 15 Feb 2011, 19:21

Quote:

I was wondering if it's possible to create a macro to fully understand C typedefs.

i am wondering if it's possble to a C coder to understand the simplicity of asm data definitions.

15 Feb 2011, 19:21

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 15 Feb 2011, 20:38

edfed wrote:

i am wondering if it's possble to a C coder to understand the simplicity of asm data definitions.

Me too.

15 Feb 2011, 20:38

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