Copying arrays of structs in C

Question

It\'s been a long since I don\'t use C language, and this is driving me crazy. I have an array of structs, and I need to create a function which will copy one array to another (

Answer 1

In my case previous solutions did not work properly! For example, @Johannes Weiß's solution did not copy "enough" data (it copied about half of the first element).
So in case, somebody needs a solution, that will give you correct results, here it is:

int i, n = 50;
struct YourStruct *a, *b;

a = calloc(n, sizeof(*a));
b = malloc(n * sizeof(*b));
for (i = 0; i < n; ++i) { 
    // filling a
}

memcpy(b, a, n * sizeof(*a)); // <----- see memcpy here

if (a != NULL) free(a);
a = calloc(n*2, sizeof(*a));

memcpy(a, b, n * sizeof(*b)); // <------ see memcpy here again

Some notes, I used calloc for a, because in the '// filling a' part I was doing operations that required initialized data.