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Index > Macroinstructions > How macro understood . or .. ?

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Roman



Joined: 21 Apr 2012
Posts: 1701
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
        
Post 09 Mar 2023, 13:36
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Overclick



Joined: 11 Jul 2020
Posts: 658
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 ...
Post 09 Mar 2023, 19:27
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Roman



Joined: 21 Apr 2012
Posts: 1701
Roman 09 Mar 2023, 19:41
Thanks.
Very cool.
Post 09 Mar 2023, 19:41
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macomics



Joined: 26 Jan 2021
Posts: 909
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
Post 09 Mar 2023, 19:57
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Overclick



Joined: 11 Jul 2020
Posts: 658
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
Post 09 Mar 2023, 20:01
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Roman



Joined: 21 Apr 2012
Posts: 1701
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
Post 09 Mar 2023, 20:02
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macomics



Joined: 26 Jan 2021
Posts: 909
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    
Post 09 Mar 2023, 20:11
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Overclick



Joined: 11 Jul 2020
Posts: 658
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
    
Post 09 Mar 2023, 20:23
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20060
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    
Smile
Post 09 Mar 2023, 21:34
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