text: /******************************************************************************
  *                                                                             *
  * 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=0;
      alt_32   MAX_STRING_LENGTH=1000;
   
      /*
      * 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=0;
          while (len < MAX_STRING_LENGTH)    
          {
              if (((next->name[len]== '/') && (next->name[len+1] == 0)) || (next->name[len] == 0))
              { 
                  if ((name[len]== '/') || (name[len] == 0))
                  {
                      return next;
                  }
                  break;
              }
              
              if (next->name[len]!=name[len]) { break; }
              len++;
          }  
          
          next = (alt_dev*) next->llist.next;
      }
    
      /* No match found */
    
      return NULL;     
  }
  
  
  
  