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Can you suggest a better way?

Cactus Blip

Hello,

This is not a Keil related question - but either way I was hoping to hear some refreshing ideas...
I have a simple data structure, like this:

typedef struct
{
        int32s  id ;
        int32s  offset ;
        int32s  ptr1[ELEMENT] ;
        int32s  ptr2[ELEMENT] ;
        int32s  ptr3[ELEMENT] ;
} my_struct ;

The module that uses this structure offers several interfaces that expect a pointer to "my_struct".
I'm working in C, so how can I best tackle the need for an exact data structure, but with different sizes of the embedded arrays?

typedef struct
{
        int32s  id ;
        int32s  offset ;
        int32s  ptr1[3*ELEMENT] ;
        int32s  ptr2[3*ELEMENT] ;
        int32s  ptr3[3*ELEMENT] ;
} my_struct2 ;

Obviously I cannot use the existing interfaces with a pointer to "my_struct2" as the offsets of the arrays after "ptr1" have changed.
I don't want to use dynamic memory allocation.
Can you suggest a better way?

Parents
  • 0 in reply to ImPer Westermark

    I think I am going to try to this recommendation:
    Now, a large struct will have the first data values stored identically to a smaller struct, so you may let all functions take a pointer to a struct of one size. Then let the function check the optional "data_size" field to check if a struct of the expected size was sent.

    thanks a lot for a most outstanding reply!

Reply
  • 0 in reply to ImPer Westermark

    I think I am going to try to this recommendation:
    Now, a large struct will have the first data values stored identically to a smaller struct, so you may let all functions take a pointer to a struct of one size. Then let the function check the optional "data_size" field to check if a struct of the expected size was sent.

    thanks a lot for a most outstanding reply!

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