how to translate typedef with bits

[Key-Real]

how to translate this?

Code: Pascal  [Select][+][-]

1. typedef struct {
2.         unsigned        addr: 24;
3.         unsigned        len:   8;
4.         u_char          r0, g0, b0, code;
5. } P_TAG;
6.  

[Fibonacci]

Just use GPT

Code: Pascal  [Select][+][-]

1. type
2.   P_TAG = bitpacked record
3.     addr: 0..16777215; // 24-bit address (24 bits can represent numbers from 0 to 16777215)
4.     len: 0..255;       // 8-bit length (8 bits can represent numbers from 0 to 255)
5.     r0, g0, b0, code: Byte;
6.   end;

[Thaddy]

Code: Pascal  [Select][+][-]

1. type
2.   P_TAG = bitpacked record
3.     addr: array[0..2] of byte;
4.     len: byte;
5.     r0, g0, b0, code: Byte;
6.   end;

makes more sense to me than GPT.

btw, the P_ indicates a pointer type, in that case:

Code: Pascal  [Select][+][-]

1. type
2.   P_TAG = ^T_TAG;
3.   T_TAG = bitpacked record
4.     addr: array[0..2] of byte;
5.     len: byte;
6.     r0, g0, b0, code: Byte;
7.   end;

This also explains the len field.
It doesn't need to be bitpacked, just packed.

[Fibonacci]

Code: Pascal  [Select][+][-]

1. type
2.   P_TAG = bitpacked record
3.     addr: array[0..2] of byte;
4.     len: byte;
5.     r0, g0, b0, code: Byte;
6.   end;

makes more sense to me than GPT.

Depends on the use case, you cant do this in your version:

Code: Pascal  [Select][+][-]

1. tag.addr := 1234;

[Thaddy]

That would be a simple cast. I think my approach is closer to what is actually meant.
Proper code would probably be a variant record, but that is not how the C code translates.
I am aware of that.

[Red_prig]

Code: Pascal  [Select][+][-]

1. type
2.   P_TAG = bitpacked record
3.     addr: 0..(1 shl 24)-1;
4.     len: Byte;      
5.     r0, g0, b0, code: Byte;
6.   end;

[Thaddy]

Same complaint.