How macro understood . or .. ?

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Roman

Joined: 21 Apr 2012
Posts: 1847

Roman 09 Mar 2023, 13:36

Fasmw 1.73
My question how macro know is . or .. name from struc POINT ?
I want my macro (Update) put integer to .x and put float to ..x

Code:


struc POINT xdata=?, ydata=? {
  .x  dd xdata ;as integer
  .y  dd ydata
..x dd 1.0 ;as float for macro 
..y dd 1.0 ;as float for macro
}
pp POINT 1,1
Update pp.x,5  ;macro put 5
Update pp..x,5 ;macro put 5f

09 Mar 2023, 13:36

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 09 Mar 2023, 19:27

You can separate locations for different types of data then check it in your macro

Code:

struc point
{
        .x dd ?
        .y dd ?
}

struc pointFloat
{
    if 0
    .:
    end if
        ..x dd ?
        ..y dd ?
}

macro Update source,data
{
   if source >= Float
      ;use float variant
   else
      ;use integer variant
   end if
}

Mytest point
Float = $       ;your float area next to this point
Mytest pointFloat

Anyway, don't you want to name it more intuitive? )) UpdateFloat pp.x.float ...

09 Mar 2023, 19:27

Roman

Joined: 21 Apr 2012
Posts: 1847

Roman 09 Mar 2023, 19:41

Thanks.
Very cool.

09 Mar 2023, 19:41

macomics

Joined: 26 Jan 2021
Posts: 1042
Location: Russia

macomics 09 Mar 2023, 19:57

Why divide it into two structures?

Code:

struc POINT xdata=?, ydata=? {
  .x  dd xdata ;as integer
  .y  dd ydata
..x dd 1.0 ;as float for macro 
..y dd 1.0 ;as float for macro
}

macro Update base*,source*,data=0 {
  if base#source >= base#..x
    mov [base#source], data#f
  else
    mov [base#source], data
  end if
}

pp POINT 1,1

Update pp,.x,5  ;macro put 5
Update pp,..x,5 ;macro put 5f

Last edited by macomics on 09 Mar 2023, 20:10; edited 1 time in total

09 Mar 2023, 19:57

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 09 Mar 2023, 20:01

macomics, your variant works for one structure only. It's ok but if there some more structures/points like that it will not.
Did you check it? match a=.b, source

Last edited by Overclick on 09 Mar 2023, 20:03; edited 2 times in total

09 Mar 2023, 20:01

Roman

Joined: 21 Apr 2012
Posts: 1847

Roman 09 Mar 2023, 20:02

I do this. Like c++ class Smile

Code:

macro Update source,data
{
   if source >= Initz
      mov eax,data
      call source
   end if
   if source = Float &  source < Initz
      mov [source],data#f ;use float variant
   end if   
   if source < Float  
      mov [source],data   ;use integer variant
   end if

}
struc POINT xdata=?, ydata=? {
  .x  dd xdata ;as integer
  .y  dd ydata
}
struc POINTfl xdata=?, ydata=? {
Float = $
if 0
    .:
    end if
..x dd xdata
..y dd ydata
}
struc POINTintz  {
Initz = $
if 0
    .:
    end if
.i:
    ;proc xdata
     add eax,eax
     ret
    ;endp
}                      
;data
pp      POINT 1,1
pp      POINTfl 2,3
pp      POINTintz 
;code
Update pp.i,32   ;do call ahhh1 i check in IDA Pro 
Update pp.x,5    ;put [pp.x],5
Update pp..x,1   ;put [pp..x],1f

Last edited by Roman on 09 Mar 2023, 20:12; edited 1 time in total

09 Mar 2023, 20:02

macomics

Joined: 26 Jan 2021
Posts: 1042
Location: Russia

macomics 09 Mar 2023, 20:11

Overclick wrote:

Did you check it? match a=.b, source

Yes. I just checked it out. The corrected version works.

Roman, only when using relative access to the fields of the structure, this will not work.

Code:

virtual at rbx
  pp POINT 1,1
end virtual

Update pp.x, 5
Update pp..x, 5

09 Mar 2023, 20:11

Overclick

Joined: 11 Jul 2020
Posts: 669
Location: Ukraine

Overclick 09 Mar 2023, 20:23

Roman you put separators at wrong places

Code:

.data
pp      POINT 1,1
Float =$
pp      POINTfl 2,3
.code
Initz =$
pp      POINTintz 
Update pp.i,32   ;do call ahhh1 i check in IDA Pro 
Update pp.x,5    ;put [pp.x],5
Update pp..x,1   ;put [pp..x],1f

09 Mar 2023, 20:23

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 09 Mar 2023, 21:34

Very confusing!

Roman wrote:

Code:

Update pp.x,5  ;macro put 5
Update pp..x,5 ;macro put 5f

This is better:
Very clear, no confusion, obvious what is intended.

Code:

Update_integer pp.x,5  ;macro put 5
Update_float   pp..x,5 ;macro put 5f

But this is best:

Code:

mov [pp.x],5
mov [pp..x],5f

09 Mar 2023, 21:34

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