String pointer table

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mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 17 Dec 2010, 15:43

I'm trying to make a string pointer table. I know there is an example here somewhere, but I can't find it.

I'm stuck at generating unique labels for the strings, how can you append the number instead of 'n'? I probably already know how, but my brain isn't working right now.

Code:

macro stringtable [strings*]
{
   common
      label .
   forward
      n=0
      dd .#n
      n=n+1
   forward
      .#n: db strings
}

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17 Dec 2010, 15:43

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20334
Location: In your JS exploiting you and your system

revolution 17 Dec 2010, 15:49

If you use "label ." then you have to use struc (not macro).

Use local to generate unique names

Code:

struc stringtable [strings*]
{
    common
    label .
    forward
      local ..n
   dd ..n
    forward
       ..n: db strings
}

17 Dec 2010, 15:49

bitRAKE

Joined: 21 Jul 2003
Posts: 4037
Location: vpcmpistri

bitRAKE 17 Dec 2010, 15:52

Is this sufficient?

Code:

macro A [B*] {
; forward ; this is implied - not needed
    local ..t
    dd ..t
  forward
    ..t db B
}

.: A 'zero','one',<'two',13,10,0>,'three'

17 Dec 2010, 15:52

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 17 Dec 2010, 15:57

revolution: Actually it was struc originally, I changed it while testing. This should work! Just need to add some .sizes.

bitRAKE: The only difference is that I would need to use label with a : to address the list?

edit: how can I define .size constants when the labels are local?

17 Dec 2010, 15:57

bitRAKE

Joined: 21 Jul 2003
Posts: 4037
Location: vpcmpistri

bitRAKE 17 Dec 2010, 16:12

There isn't any size checking for ":" labels - be careful, FASM will not error on mov al,[.] - iirc, no different than using "label .".

Code:

struc A [B*] { 
  common
    .: 
  forward
    local ..t 
    dd ..t 
  common
    .entries = ($-.) shr 2
  forward 
    ..t db B 
}

17 Dec 2010, 16:12

mindcooler

Joined: 01 Dec 2009
Posts: 423
Location: Västerås, Sweden

mindcooler 18 Dec 2010, 18:41

I did it like this, interleaved pointers with string lengths:

Code:

struc stringtable [strings*]
{
    common
        label .
    forward
        local ..n
        dd ..n
        dd ..n#.size
    forward
        ..n: db strings
        ..n#.size=$-..n
}

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18 Dec 2010, 18:41

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