/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include "mysys_priv.h"
#include "my_sys.h"
#include <m_string.h>

/**
  Returns full load-path for a file. to may be = path.

  @param to   Pointer to destination which will hold the expanded path.
  @param path Pointer to buffer containing the supplied path.
  @param own_path_prefix  Prefix to be appended to path.

  @retval to  Pointer to the supplied destination buffer
              that will hold the full load-path.
*/

char * my_load_path(char * to, const char *path,
		       const char *own_path_prefix)
{
  char buff[FN_REFLEN];
  int cur_prefix_len;
  const char *buff_ptr= path;

  DBUG_ENTER("my_load_path");
  DBUG_PRINT("enter",("path: %s  prefix: %s",path,
		      own_path_prefix ? own_path_prefix : ""));

  cur_prefix_len= (path[0] == FN_CURLIB && path[1] == FN_LIBCHAR)?2:0;

  // If path starts with current dir or parent-dir unpack path.
  if ( cur_prefix_len || is_prefix(path, FN_PARENTDIR))
  {
    if ((strlen(path) + cur_prefix_len) < FN_REFLEN &&
        !my_getwd(buff, (uint) (FN_REFLEN - strlen(path) + cur_prefix_len), MYF(0)))
    {
        (void) strncat(buff, path + cur_prefix_len, FN_REFLEN - strlen(buff) - 1);
        buff_ptr= buff;
    }
  }
  /*
    Prepend the path with own_path_prefix if own_path_prefix is
    specified and path doesn't start with home directory character
    and path is not a hard-path.
    If path is hard path or home dir, return the path.
  */
  else if (own_path_prefix != NULL &&
           !(path[0] == FN_HOMELIB && path[1] == FN_LIBCHAR) &&
           !test_if_hard_path(path))
  {
    (void) strxnmov(buff, sizeof(buff)-1, own_path_prefix, path, NullS);
    buff_ptr= buff;
  }

  my_stpnmov(to, buff_ptr, FN_REFLEN);
  to[FN_REFLEN-1]= '\0';
  DBUG_PRINT("exit",("to: %s",to));
  DBUG_RETURN(to);
} /* my_load_path */