/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * 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/.

 */

#include <oslrandom.h>

#include <assert.h>

#include <errno.h>

#include <fcntl.h>

#include <unistd.h>

#include <dlfcn.h>

bool osl_get_system_random_data(char* buffer, size_t desired_len)

{

    int fd;

    assert(buffer);

    static int (*lok_open_urandom)()

        = reinterpret_cast<int (*)()>(dlsym(RTLD_DEFAULT, "lok_open_urandom"));

    if (!lok_open_urandom || (fd = lok_open_urandom()) < 0)

        fd = open("/dev/urandom", O_RDONLY);

    if (fd != -1)

    {

        while (desired_len)

        {

            ssize_t nb_read;

            if ((nb_read = read(fd, buffer, desired_len)) < 0)

            {

                if (errno != EINTR)

                {

                    close(fd);

                    return false;

                }

            }

            else

            {

                buffer += nb_read;

                desired_len -= nb_read;

            }

        }

        close(fd);

        return true;

    }

    return false;

}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */