1  /* Find path of executable.
       2     Copyright (C) 1998-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stdlib.h>
      20  #include <string.h>
      21  #include <sys/param.h>
      22  #include <ldsodefs.h>
      23  
      24  #include <dl-dst.h>
      25  
      26  
      27  const char *
      28  _dl_get_origin (void)
      29  {
      30    char *result = (char *) -1;
      31    /* We use the environment variable LD_ORIGIN_PATH.  If it is set make
      32       a copy and strip out trailing slashes.  */
      33    if (GLRO(dl_origin_path) != NULL)
      34      {
      35        size_t len = strlen (GLRO(dl_origin_path));
      36        result = (char *) malloc (len + 1);
      37        if (result == NULL)
      38  	result = (char *) -1;
      39        else
      40  	{
      41  	  char *cp = __mempcpy (result, GLRO(dl_origin_path), len);
      42  	  while (cp > result + 1 && cp[-1] == '/')
      43  	    --cp;
      44  	  *cp = '\0';
      45  	}
      46      }
      47  
      48    return result;
      49  }