Copy a multi-string into a buffer

Question

I'm using a windows-api that returns a wide-char multi-string as result. The result is same as below:

L"apple\0banana\0orange\0\0"

Is there any standard function or good performance solution to copy this structure to a buffer?

copy_wide_char_multi_string(dst, src); // dst and src are wchar_t arrays

Answer 1

I've never bothered to work with wide character strings so consider this a guideline.

You can implement an algorithm like the following:

wchar_t * wide_string = L"something\0something else\0herp\0derp\0\0";
int size = 0;

int i = wcslen(wide_string + size);     // length of wide string
size += i + 1;                          // length of wide string inc. null terminator
while (true)
{
    int i = wcslen(wide_string + size); // length of wide string
    size += i + 1;                      // length of wide string inc. null terminator
    if (i == 0) break;                  // if length was 0 (2 nulls in a row) break
}
++size;                                 // count final null as part of size

This will give you the size of the data in the buffer. Once you have that you can just use wmemcpy on it