Cast a struct of ints to an array of ints

Question

I am using a library that has a function that takes an array of structs. That struct and function has the following layout:

struct TwoInt32s
{
  int32_t a;
         


        

Answer 1

malloc allocates bytes. Why did you choose "2*len" ?

You could simply use "sizeof":

int32_t *buffer = malloc(len * sizeof(TwoInt32s));
/* fill in the buffer */
write((struct TwoInt32s*)buffer, len);

and as Erik mentioned, it would be a good practice to pack the struct.