/*

 * Copyright 2021 Richard Hughes <richard@hughsie.com>

 *

 * SPDX-License-Identifier: LGPL-2.1-or-later

 */

#include "config.h"

#ifdef HAVE_KENV_H

#include <kenv.h>

#endif

#include "fwupd-error.h"

#include "fu-kenv.h"

/**

 * fu_kenv_get_string:

 * @key: a kenv key, e.g. `smbios.bios.version`

 * @error: (nullable): optional return location for an error

 *

 * Gets a BSD kernel environment string. This will not work on Linux or

 * Windows.

 *

 * Returns: (transfer full): a string, or %NULL if the @key was not found

 *

 * Since: 1.6.1

 **/

gchar *

fu_kenv_get_string(const gchar *key, GError **error)

{

#ifdef HAVE_KENV_H

  gchar buf[128] = {'\0'};

  g_return_val_if_fail(key != NULL, NULL);

  g_return_val_if_fail(error == NULL || *error == NULL, NULL);

  if (kenv(KENV_GET, key, buf, sizeof(buf)) == -1) {

    g_set_error(error,

          FWUPD_ERROR,

          FWUPD_ERROR_READ,

          "cannot get kenv request for %s",

          key);

    return NULL;

  }

  return g_strndup(buf, sizeof(buf));

#else

  g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_NOT_SUPPORTED, "kenv not supported");

  return NULL;

#endif

}