/* Find path of executable.

   Copyright (C) 1998-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

   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 <stdlib.h>

#include <string.h>

#include <sys/param.h>

#include <ldsodefs.h>

#include <dl-dst.h>

const char *

_dl_get_origin (void)

{

  char *result = (char *) -1;

  /* We use the environment variable LD_ORIGIN_PATH.  If it is set make

     a copy and strip out trailing slashes.  */

  if (GLRO(dl_origin_path) != NULL)

    {

      size_t len = strlen (GLRO(dl_origin_path));

      result = (char *) malloc (len + 1);

      if (result == NULL)

	result = (char *) -1;

      else

	{

	  char *cp = __mempcpy (result, GLRO(dl_origin_path), len);

	  while (cp > result + 1 && cp[-1] == '/')

	    --cp;

	  *cp = '\0';

	}

    }

  return result;

}