Function VSIMkdirRecursive

port/cpl_vsil.cpp:645–712

 */

int VSIMkdirRecursive(const char *pszPathname, long mode)
{
    if (!pszPathname)
        return -1;

    std::string osPathnameOri(pszPathname);
    if (cpl::starts_with(osPathnameOri, "/vsimem/"))
    {
        osPathnameOri = VSIFileManager::GetHandler(pszPathname)
                            ->GetCanonicalFilename(osPathnameOri);
    }
    // Limit to avoid performance issues such as in
    // https://issues.oss-fuzz.com/issues/471096341
    constexpr size_t CPL_MAX_PATH = 4096;
    if (osPathnameOri.empty() || osPathnameOri == "/" ||
        osPathnameOri.size() > CPL_MAX_PATH)
        return -1;

    VSIStatBufL sStat;
    if (VSIStatL(osPathnameOri.c_str(), &sStat) == 0)
    {
        return VSI_ISDIR(sStat.st_mode) ? 0 : -1;
    }

    std::string osCurrentPath(osPathnameOri);
    std::vector<std::string> aosQueue;
    while (true)
    {
        std::string osParentPath(CPLGetPathSafe(osCurrentPath.c_str()));

        // Prevent crazy paths from recursing forever.
        if (osParentPath.length() >= osCurrentPath.length())
        {
            break;
        }

        if (!osParentPath.empty() &&
            VSIStatL(osParentPath.c_str(), &sStat) != 0)
        {
            osCurrentPath = std::move(osParentPath);
            aosQueue.push_back(osCurrentPath);
        }
        else
        {
            break;
        }
    }

    for (auto oIter = aosQueue.rbegin(); oIter != aosQueue.rend(); ++oIter)
    {
        if (VSIMkdir(oIter->c_str(), mode) != 0 &&
            // In case of concurrent VSIMkdirRecursive() on the same directory
            (VSIStatL(oIter->c_str(), &sStat) != 0 ||
             !VSI_ISDIR(sStat.st_mode)))
        {
            return -1;
        }
    }