Listing 1 Identifying case-sensitive filenames that would clash as duplicates on case-insensitive filesystems

int cmp_no_case( struct dirent const *lhs
               , struct dirent const *rhs);

int main(int , char **)
{
  using unixstl::readdir_sequence;

  readdir_sequence                 files("/usr/include");
  readdir_sequence::const_iterator begin_o(files.begin());
  readdir_sequence::const_iterator end_o(files.end());

  for(; begin_o != end_o; ++begin_o) // outer loop
  {
    readdir_sequence::const_iterator begin_i  = begin_o;

    for(++begin_i; begin_i != end_o; ++begin_i) // inner loop
    {
      if(0 == cmp_no_case(*begin_o, *begin_i))
      {
        printf("Duplicate: %s, %s\n",
            (*begin_o)->d_name,
            (*begin_i)->d_name);
      }
    }
  }

  return 0;
}