How to truncate a file from the end? (cross platform)

Question

I am trying to find a cross-platform method to delete X bytes from the end of a file.

Currently I have found:

• Platform specific solutio

Answer 1

How do you think cross platform functions work? Just make your own function like this:

int truncate(int fd, long size)
{
#ifdef _WIN32 || _WIN64 
    return _chsize(fd, size);
#else
  #ifdef POSIX
    return ftruncate(fd, size);
  #else
    // code for other OSes
  #endif
#endif
}