tempdir.cpp

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/*******************************************************************\
 
Module:
 
Author: CM Wintersteiger
 
\*******************************************************************/
 
#include "tempdir.h"
 
#include <filesystem>
 
// clang-format off
#ifndef _WIN32
#if defined(__FreeBSD_kernel__) || \
    defined(__CYGWIN__) || \
    defined(__MACH__)
#include <unistd.h>
#endif
 
#include <cstdlib>
#include <cstring>
#include <vector>
#endif
// clang-format on
 
#include "exception_utils.h"
 
std::string get_temporary_directory(const std::string &name_template)
{
  std::string result;
 
#ifdef _WIN32
  (void)name_template; // unused parameter
  try
  {
    result = std::filesystem::temp_directory_path().string();
  }
  catch(const std::filesystem::filesystem_error &)
  {
    throw system_exceptiont("Failed to create temporary directory");
  }
#else
  std::string prefixed_name_template = "/tmp/";
  const char *TMPDIR_env = getenv("TMPDIR");
  if(TMPDIR_env != nullptr)
    prefixed_name_template = TMPDIR_env;
  if(*prefixed_name_template.rbegin() != '/')
    prefixed_name_template += '/';
  prefixed_name_template += name_template;
 
  std::vector<char> t(
    prefixed_name_template.begin(), prefixed_name_template.end());
  t.push_back('\0'); // add the zero
  const char *td = mkdtemp(t.data());
  if(!td)
    throw system_exceptiont("Failed to create temporary directory");
 
  errno = 0;
  char *wd = realpath(td, nullptr);
 
  if(wd == nullptr)
    throw system_exceptiont(
      std::string("realpath failed: ") + std::strerror(errno));
 
  result = std::string(wd);
  free(wd);
#endif
 
  return result;
}
 
temp_dirt::temp_dirt(const std::string &name_template)
{
  path=get_temporary_directory(name_template);
}
 
std::string temp_dirt::operator()(const std::string &file)
{
  return std::filesystem::path(path).append(file).string();
}
 
void temp_dirt::clear()
{
  std::filesystem::remove_all(path);
}
 
temp_dirt::~temp_dirt()
{
  clear();
}