.. category

[baconpaul]

..\ (repeated) can be used in the Category when saving patches, to write anywhere in the User area. On Windows, I get an error if I try to navigate up further, so at least user-level security in the OS is working. I'm not sure how other target OSs might behave (Linux, macOS, etc).

From j5v

[baconpaul]

#include <filesystem>
#include <iostream>

int main(int, char **)
{
   auto p = std::filesystem::path{"/foo/bar/hootie"};
   auto ps = p/"this"/"that";
   auto psu = ps / "..";
   auto psu3 = ps / ".." / ".." / "..";

   std::cout << "P = " << p.u8string() << std::endl;

   for (const auto &vs : {p, ps, psu, psu3} )
   {
      std::cout << "  vs = " << vs.u8string() << std::endl;
      std::cout << "       a : " << vs.lexically_normal().u8string() << std::endl;
      std::cout << "       b : " << p.lexically_relative(vs.lexically_normal()).u8string() << std::endl;

      auto qt = vs.lexically_normal();
      auto [a, b] = std::mismatch(qt.begin(), qt.end(), p.begin(), p.end());
      std::cout << "       c : " << (a == qt.end() ? "AEND" : "AOK" ) << " " << (b == p.end() ? "BEND" : "BOK") << std::endl;
   }

}

if (b != p.end()) that means that the directory is not below p.