Effectively replicate the behavior of the function in the manner
which is used for autosave file.
There might be better a solution which is cross-platform and does
not suffer from the time of check, time of use (TOCTOU) vector of
attack. This seems to be a bigger project to figure out, so until
then silence the warning: it is fine since the directory is only
used to chdir to, so worst case an external attacker can introduce
is a test failure.
It provides path to a directory suitable for storing temporary files
which satisfies the following conditions:
- The directory exists.
- The return path has trailing directory separator.
It is based on the code used in the appdir.c to get the temporary
directory.
For the C++ people: this is similar to the temp_directory_path()
from the std::filesystem.
No functional changes expected as it is a new code which is planned
to be used on other places as a followup development.
Sergey Sharybin