Translate block of code from C++ to ASM.

[lelejau]

Hi.

I made a program in C++, and I want to translate it to asm, but I dont have a clue of what to do.

Here is the code:

typedef void (*t_ChatPrint)      ( char * );
t_ChatPrint   ChatPrint      = (t_ChatPrint)0x0054E410;

void ChatPrintf( const char *format, ... )
{
   va_list   ap;
   char   szBuffer[512] = "";

   va_start( ap, format );
   _vsnprintf_s( szBuffer, 512, 511, format, ap );
   va_end( ap );

   ChatPrint( szBuffer );
}

Thanks in advance.

[hutch--]

Try learning assembler, its a trivial task.

[lelejau]

I am trying, but this is too far from my knoledge, so I hope anyone here can help me out. I read in the rules that asking for others to do your homework isnt allowed, but this isnt my homework. just in case someone talks about it.. thanks in advance.

[drizz]

Code Select Expand

;typedef void (*t_ChatPrint)      ( char * );
t_ChatPrint_fn typedef proto c :ptr sbyte
t_ChatPrint typedef ptr t_ChatPrint_fn

;t_ChatPrint   ChatPrint      = (t_ChatPrint)0x0054E410;
.data
ChatPrint t_ChatPrint 00054E410h

.code
;void ChatPrintf( const char *format, ... )
ChatPrintf proc c format:ptr sbyte, ap:vararg
;{
   ;va_list   ap;
   ;char   szBuffer[512] = "";
   LOCAL szBuffer[512]:sbyte

   mov szBuffer[0],0
   
   ;va_start( ap, format );
   invoke _vsnprintf_s, addr szBuffer, 512, 511, format, addr ap ;
   ;va_end( ap );

   invoke ChatPrint, addr szBuffer;
;}
ret
ChatPrintf endp


[lelejau]

thanks, I will test and tell if it works.



undefined symbol: _vsnprintf_s

[drizz]

undefined symbol: _vsnprintf_s

What did you expect? All external functions automagically working under masm32?

Short solution is to use unsafe version _vsnprintf (i guess masm32 version is crt__vsnprintf :eek).

The long (right) solution is to link against newer msvcrt (msvcrt80 or msvcrt90 i don't know) and add a prototype.

thanks, I will test and tell if it works.

Like i don't know what I'm doing...

[hutch--]

lelejau,

If all you want to do is output some text to the console you can manually use Windows API functions or use the masm32 library function StdOut or cheat and use the masm32 "print" macro.

[lelejau]

No no, it isn't for a MASM program. this is for a game. Display text inside the game chat. But that nothing to do with hacking, or malicious program, I'm far from it. I would never learn assembler or any other language to hack someone, or something like that.

[dedndave]

No no, it isn't for a MASM program. this is for a game. Display text inside the game chat. But that nothing to do with hacking, or malicious program, I'm far from it. I would never learn assembler or any other language to hack someone, or something like that.

[lelejau]

No no, it isn't for a MASM program. this is for a game. Display text inside the game chat. But that nothing to do with hacking, or malicious program, I'm far from it. I would never learn assembler or any other language to hack someone, or something like that.

Sorry?

[dedndave]

lol
not asking forgiveness

appearance of innocence - facetious
reminds me of Jade when she was little.....

Who ate all the cookies ????

[oex]

It was you wasnt it Dave :bdg, really.... If we are being completely honest :lol

[dedndave]

especially if they are ginger-snaps   :P

[MichaelW]

So that's not a guilty look, it's a "I wonder what's wrong with my daddy" look?

[dedndave]

she is spoiled rotten - lol
daddy's little girl