/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2025 Todd C. Miller <Todd.Miller@sudo.ws>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#include <config.h>

#include <stdlib.h>

#include <unistd.h>

#include <limits.h>

#include <sudo_compat.h>

#include <sudo_util.h>

#ifndef LOGIN_NAME_MAX

# ifdef _POSIX_LOGIN_NAME_MAX

#  define LOGIN_NAME_MAX _POSIX_LOGIN_NAME_MAX

# else

#  define LOGIN_NAME_MAX 9

# endif

#endif /* LOGIN_NAME_MAX */

size_t

sudo_login_name_max_v1(void)

{

    static size_t maxval;

    if (maxval == 0) {

  long lval;

#ifdef _SC_LOGIN_NAME_MAX

  lval = sysconf(_SC_LOGIN_NAME_MAX);

  if (lval < 0)

#endif

      lval = LOGIN_NAME_MAX;

  maxval = (size_t)lval;

    }

    return maxval;

}