convert wchar_t array into int array in C

Question

I'm trying to convert a wchar_t array into an int array which contains the encoding of each wchar_t element in C. I know I can do this by a loop like the code below, is there any other way without using a loop which can greatly improve performance?

 for(int i=0; i< filesize; i++){
    t[i] = (int)p[i];   //t is an int array, p is a wchar_t array
}

Answer 1

Assuming wchar_t and int have the same size, memcpy is probably what you want.

#include <string.h>
#include <wchar.h>

int main(void)
{
    _Static_assert(sizeof (int) == sizeof (wchar_t), "This won't work");
    wchar_t warr[3] = {L'a', L'b', L'c'};
    int iarr[3] = {0};
    memcpy(iarr, warr, sizeof warr);
    // iarr now holds the same contents as warr
}