/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <unistd.h>

#include <errno.h>

#include <stdarg.h>

#include <sys/param.h>

/* Execute PATH with all arguments after PATH until

   a NULL pointer and environment from `environ'.  */

int

execl (const char *path, const char *arg, ...)

{

  ptrdiff_t argc;

  va_list ap;

  va_start (ap, arg);

  for (argc = 1; va_arg (ap, const char *); argc++)

    {

      if (argc == INT_MAX)

	{

	  va_end (ap);

	  errno = E2BIG;

	  return -1;

	}

    }

  va_end (ap);

  /* Avoid dynamic memory allocation due two main issues:

     1. The function should be async-signal-safe and a running on a signal

        handler with a fail outcome might lead to malloc bad state.

     2. It might be used in a vfork/clone(VFORK) scenario where using

        malloc also might lead to internal bad state.  */

  ptrdiff_t i;

  char *argv[argc + 1];

  va_start (ap, arg);

  argv[0] = (char *) arg;

  for (i = 1; i <= argc; i++)

    argv[i] = va_arg (ap, char *);

  va_end (ap);

  return __execve (path, argv, __environ);

}

libc_hidden_def (execl)