how to use macro in structure initialization?

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zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 09 May 2013, 15:18

Hi guys.

Lets say I have a macro which pads fixed string with spaces:

Code:

macro padded_str len, text {
    local length
    length = $
    db text
    length = $-length
    db len-length dup (0x20)
}

and I have a structure, which holds this string:

Code:

struct my_struct
    string rb 32
ends

when I try to initialize the structure in source,

Code:

s my_struct padded_str 32, sz_some_text

it fails with 'invalid macro arguments' error

how to do it right? thanks

09 May 2013, 15:18

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20425
Location: In your JS exploiting you and your system

revolution 09 May 2013, 23:24

Macros and strucs are the same thing except for the label usage:

Code:

struc padded_str len, text {
    local length
    length = $
    db text
    length = $-length
    db len-length dup (0x20)
}

s padded_str 32, sz_some_text

09 May 2013, 23:24

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 11 May 2013, 19:01

Because struc requires label to precede its invocation, it could be shortened to

Code:

struc padded_str len*, pad=' ', [text*] {
common
  . db text
    db .+len-$ dup pad
}

s padded_str 32,, sz_some_text

sz_some_text looks somewhat strange, even if it is symbolic constant (I mean sz prefix, WRT 0x20 padding). Wink

11 May 2013, 19:01

zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 12 May 2013, 00:41

I use this prefix (sz) to address null-terminated strings. like some sort of an acronym to String,Zero. But in this example, with padding, looks strange, I agree Smile

12 May 2013, 00:41

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