Defining a structure

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jorido

Joined: 23 Jan 2017
Posts: 53

jorido 24 Jan 2017, 18:14

How to define a simple structure? I've seen this:

1)

Code:


struc point x, y, z
{
    .x db x,
    .y db y,
    .z db z
}

Code:

  struct POINT
    x db ?
    y db ?
    z db ?
  ends

Questions:
a) is it struc or struct?
b) why { ... } in #1?
c) why arguments in #1?
d) or are these just 2 different ways to do basically the same thing?

And:

e) What's the most common convention for naming a structure: MY_STRUCT? Or MyStruct? Or my_struct? Or anything else?

24 Jan 2017, 18:14

Trinitek

Joined: 06 Nov 2011
Posts: 257

Trinitek 24 Jan 2017, 18:42

They're different things.

The first one, struc, is a directive that is provided by FASM. http://flatassembler.net/docs.php?article=manual#2.3.4

The second, struct, is a macro that is defined in win32a.inc. http://flatassembler.net/docs.php?article=win32#1.1

24 Jan 2017, 18:42

jorido

Joined: 23 Jan 2017
Posts: 53

jorido 24 Jan 2017, 19:29

Which one and when is used?

24 Jan 2017, 19:29

jorido

Joined: 23 Jan 2017
Posts: 53

jorido 25 Jan 2017, 07:38

What if I had a structre with 10 fields, would I have to list all of them as arguments?

Code:

struc point a1, a2, a3, a4, a5, a6, a7, a8, a9, a10
{
  .........

25 Jan 2017, 07:38

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 25 Jan 2017, 08:00

If you have a fixed number of arguments then, yes, you have to list them all if you need to initialise the values at the time of definition. If you have a variable number of arguments then you can use square brackets [args] to define the name and loop through the values with forward and reverse.

25 Jan 2017, 08:00

jorido

Joined: 23 Jan 2017
Posts: 53

jorido 25 Jan 2017, 09:11

>If you have a fixed number of arguments then, yes, you have to list them all if you need to initialise the values at the time of definition.

If I have a fixed number of them but don't want to initialise the values?

Alright, and how about:

e) What's the most common convention for naming a structure: MY_STRUCT? Or MyStruct? Or my_struct? Or anything else?

25 Jan 2017, 09:11

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 25 Jan 2017, 10:19

jorido wrote:

If I have a fixed number of them but don't want to initialise the values?

Then just use a bare stuc with no defined parameters

jorido wrote:

e) What's the most common convention for naming a structure: MY_STRUCT? Or MyStruct? Or my_struct? Or anything else?

There is not really a common convention. Basically do whatever makes sense to you in your project. Your boss (if you have one) may dictate to you what naming conventions to use. They are arbitrary, but important.

25 Jan 2017, 10:19

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