Function findProjLibInStandartPaths

src/proj_loader.cpp:237–295

Search for the PROJ library within the standard installation directories.

/// Search for the PROJ library within the standard installation directories.
static std::string findProjLibInStandartPaths(std::set<std::filesystem::path>& searchedPaths) {
  const char* homeDir = nullptr;
  std::vector<std::filesystem::path> pathsToCheck;
  std::string latestVersionPath;
  std::string latestVersionName;

#ifdef _WIN32
  // Windows-Standardpfade
  pathsToCheck.push_back("C:\\Program Files\\");
  pathsToCheck.push_back("C:\\Program Files (x86)\\");

  const char* userProfile = getenv("USERPROFILE");
  if (userProfile) {
    pathsToCheck.push_back(std::filesystem::path(userProfile) / "AppData/Local/Programs");
  }
#else
  // Linux/macOS-Standardpfade
  const std::string systemLibPaths[] = {
      "/usr/lib/x86_64-linux-gnu/", 
      "/usr/lib/", 
      "/usr/bin/", 
      "/usr/local/lib/", 
      "/usr/local/bin/", 
      "/opt/", 
      "/usr/share/", 
      "/lib/x86_64-linux-gnu/"};
  homeDir = getHomeDirectory();

  for (const auto& p : systemLibPaths) pathsToCheck.push_back(p);
  if (homeDir) pathsToCheck.push_back(std::filesystem::path(homeDir) / ".local/lib");
#endif

  // 1. Check only top-level dirs
  for (const auto& basePath : pathsToCheck) {
    try {
      if (std::filesystem::exists(basePath) && std::filesystem::is_directory(basePath)) {
        searchedPaths.insert(basePath);
        const std::string resultPath = findLatestProjLibraryPath(basePath.string());

        if (!resultPath.empty()) {
          std::filesystem::path projPath(resultPath);
          std::string fileName = projPath.filename().string();

          if (latestVersionName.empty() || compareVersions(fileName, latestVersionName)) {
            latestVersionName = fileName;
            latestVersionPath = projPath.string();
          }
        }
      }
    } catch (const std::filesystem::filesystem_error&) {
      continue;
    }
  }
  if (!latestVersionPath.empty()) {
    LASMessage(LAS_VERY_VERBOSE, "PROJ library found in path: %s", latestVersionPath.c_str());
    return latestVersionPath;
  }
  return "";