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[/] [ao486/] [trunk/] [syn/] [components/] [sd_card/] [firmware/] [bsp/] [HAL/] [src/] [alt_find_dev.c] - Blame information for rev 8

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1 8 alfik
/******************************************************************************
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*                                                                             *
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* License Agreement                                                           *
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*                                                                             *
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* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
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* All rights reserved.                                                        *
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*                                                                             *
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* Permission is hereby granted, free of charge, to any person obtaining a     *
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* copy of this software and associated documentation files (the "Software"),  *
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* to deal in the Software without restriction, including without limitation   *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
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* and/or sell copies of the Software, and to permit persons to whom the       *
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* Software is furnished to do so, subject to the following conditions:        *
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*                                                                             *
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* The above copyright notice and this permission notice shall be included in  *
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* all copies or substantial portions of the Software.                         *
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*                                                                             *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
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* DEALINGS IN THE SOFTWARE.                                                   *
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*                                                                             *
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* This agreement shall be governed in all respects by the laws of the State   *
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* of California and by the laws of the United States of America.              *
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*                                                                             *
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* Altera does not recommend, suggest or require that this reference design    *
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* file be used in conjunction or combination with any other product.          *
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******************************************************************************/
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include "sys/alt_dev.h"
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#include "priv/alt_file.h"
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#include "alt_types.h"
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/*
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 * alt_find_dev() is used by open() in order to locate a previously registered
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 * device with the name "name". The input argument "llist" is a pointer to the
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 * head of the device list to search.
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 *
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 * The return value is a pointer to the matching device, or NULL if there is
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 * no match.
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 *
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 * "name" must be an exact match for the devices registered name for a match to
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 * be found.
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 */
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alt_dev* alt_find_dev(const char* name, alt_llist* llist)
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{
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  alt_dev* next = (alt_dev*) llist->next;
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  alt_32 len;
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  len  = strlen(name) + 1;
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  /*
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   * Check each list entry in turn, until a match is found, or we reach the
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   * end of the list (i.e. next winds up pointing back to the list head).
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   */
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  while (next != (alt_dev*) llist)
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  {
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    /*
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     * memcmp() is used here rather than strcmp() in order to reduce the size
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     * of the executable.
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     */
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    if (!memcmp (next->name, name, len))
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    {
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      /* match found */
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      return next;
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    }
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    next = (alt_dev*) next->llist.next;
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  }
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  /* No match found */
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  return NULL;
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}
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