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/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

* Altera does not recommend, suggest or require that this reference design    *

* file be used in conjunction or combination with any other product.          *

******************************************************************************/

#include <stddef.h>

#include <stdio.h>

#include <string.h>

#include "sys/alt_dev.h"

#include "priv/alt_file.h"

#include "alt_types.h"

/*

 * alt_find_file() is used by open() in order to locate a previously registered

 * filesystem that owns that mount point that contains the file named "name".

 *

 * The return value is a pointer to the matching filesystem, or NULL if there is

 * no match.

 *

 * A match is considered to have been found if the filesystem name followed by

 * either '/' or '\0' is the prefix of the filename. For example the filename:

 * "/myfilesystem/junk.txt" would match: "/myfilesystem", but not: "/myfile".

 */

alt_dev* alt_find_file (const char* name)

{

  alt_dev* next = (alt_dev*) alt_fs_list.next;

  alt_32 len;

  /*

   * Check each list entry in turn, until a match is found, or we reach the

   * end of the list (i.e. next winds up pointing back to the list head).

   */

  while (next != (alt_dev*) &alt_fs_list)

  {

    len = strlen(next->name);

    if (next->name[len-1] == '/')

    {

      len -= 1;

    }

    if (((name[len] == '/') || (name[len] == '\0')) &&

        !memcmp (next->name, name, len))

    {

      /* match found */

      return next;

    }

    next = (alt_dev*) next->llist.next;

  }

  /* No match found */

  return NULL;

}