libcruft-util/fs/tmp_posix.cpp

/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2022, Danny Robson <danny@nerdcruft.net>
 */

#include "./tmp.hpp"

#include "./paths.hpp"
#include "./posix/except.hpp"

#include <unistd.h>


///////////////////////////////////////////////////////////////////////////////
std::filesystem::path
cruft::fs::mktempfile ()
{
    return mktempfile (cruft::paths::temp ());
}


//-----------------------------------------------------------------------------
std::filesystem::path
cruft::fs::mktempfile (std::filesystem::path const &dir)
{
    auto pattern = (dir / PACKAGE_NAME "-XXXXXX").native ();

    auto const fd = mkstemp (pattern.data ());
    if (fd < 0)
        cruft::posix::error::throw_code ();

    cruft::posix::error::try_call(::close, fd);

    return pattern;
}


///////////////////////////////////////////////////////////////////////////////
std::filesystem::path
cruft::fs::mktmpdir (void)
{
    // The pattern suffix we'll append to the temp directory.
    //
    // * We might as well append the package name for clarity
    // * The libc call REQUIRES the string end with "XXXXXX"
    char const SUFFIX[] = "/" PACKAGE_NAME "-XXXXXX";

    auto const root = cruft::paths::temp ();
    std::string path;
    path.reserve (root.string ().size () + sizeof (SUFFIX));
    path  = root.string ();
    path += SUFFIX;

    if (!mkdtemp (path.data ()))
        cruft::posix::error::throw_code ();

    return std::filesystem::path (path);
}