generic_page.c

来自「qnx powerpc MPC8245的 BSP源文件」· C语言 代码 · 共 76 行

/*
 * $QNXLicenseC: 
 * Copyright 2007, QNX Software Systems.  
 *  
 * Licensed under the Apache License, Version 2.0 (the "License"). You  
 * may not reproduce, modify or distribute this software except in  
 * compliance with the License. You may obtain a copy of the License  
 * at: http://www.apache.org/licenses/LICENSE-2.0  
 *  
 * Unless required by applicable law or agreed to in writing, software  
 * distributed under the License is distributed on an "AS IS" basis,  
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied. 
 * 
 * This file may contain contributions from others, either as  
 * contributors under the License or as licensors under other terms.   
 * Please review this entire file for other proprietary rights or license  
 * notices, as well as the QNX Development Suite License Guide at  
 * http://licensing.qnx.com/license-guide/ for other information. 
 * $ 
 */






/*
** File: genric_page.c
**
** Description:
**
** This file contains the page function for the generic flash library
**
** Ident: $Id: generic_page.c,v 1.5.2.1 2005/07/08 13:36:37 mkisel Exp $
*/

/*
** Includes
*/

#include "generic.h"


uint8_t *generic_page(f3s_socket_t *socket,
                        uint32_t flags,
                        uint32_t offset,
                        int32_t *size)
{
  if(offset >= socket->window_size)
  {
	errno = ERANGE;
	return NULL;
  }

  /* check if offset does not fit in current page */
  if (!(offset>=socket->window_offset && offset<socket->window_offset+
   socket->window_size))
  {
    /* select proper page */
    socket->window_offset=offset&~(socket->window_size-1);
  }

  /* check if size is wanted */
  if (size)
    *size=min((offset&~(socket->window_size-1))+socket->window_size-offset,
     *size);

  /* return memory pointer */
  return socket->memory+offset;
}

/*
** End
*/