text: /*
   * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   * All rights reserved. 
   * 
   * Redistribution and use in source and binary forms, with or without modification, 
   * are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission. 
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
   * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
   * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
   * OF SUCH DAMAGE.
   *
   * This file is part of the lwIP TCP/IP stack.
   * 
   * Author: Adam Dunkels <adam@sics.se>
   *
   */
   /**
   * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
   */
  #ifndef __LWIP_DEBUG_H__
  #define __LWIP_DEBUG_H__
  
  #include "lwip/arch.h"
  #include "lwip/opt.h"
  
  /** lower two bits indicate debug level
   * - 0 all
   * - 1 warning
   * - 2 serious
   * - 3 severe
   */
  #define LWIP_DBG_LEVEL_ALL     0x00
  #define LWIP_DBG_LEVEL_OFF     LWIP_DBG_LEVEL_ALL /* compatibility define only */
  #define LWIP_DBG_LEVEL_WARNING 0x01 /* bad checksums, dropped packets, ... */
  #define LWIP_DBG_LEVEL_SERIOUS 0x02 /* memory allocation failures, ... */
  #define LWIP_DBG_LEVEL_SEVERE  0x03
  #define LWIP_DBG_MASK_LEVEL    0x03
  
  /** flag for LWIP_DEBUGF to enable that debug message */
  #define LWIP_DBG_ON            0x80U
  /** flag for LWIP_DEBUGF to disable that debug message */
  #define LWIP_DBG_OFF           0x00U
  
  /** flag for LWIP_DEBUGF indicating a tracing message (to follow program flow) */
  #define LWIP_DBG_TRACE         0x40U
  /** flag for LWIP_DEBUGF indicating a state debug message (to follow module states) */
  #define LWIP_DBG_STATE         0x20U
  /** flag for LWIP_DEBUGF indicating newly added code, not thoroughly tested yet */
  #define LWIP_DBG_FRESH         0x10U
  /** flag for LWIP_DEBUGF to halt after printing this debug message */
  #define LWIP_DBG_HALT          0x08U
  
  #ifndef LWIP_NOASSERT
  #define LWIP_ASSERT(message, assertion) do { if(!(assertion)) \
    LWIP_PLATFORM_ASSERT(message); } while(0)
  #else  /* LWIP_NOASSERT */
  #define LWIP_ASSERT(message, assertion) 
  #endif /* LWIP_NOASSERT */
  
  /** if "expression" isn't true, then print "message" and execute "handler" expression */
  #ifndef LWIP_ERROR
  #define LWIP_ERROR(message, expression, handler) do { if (!(expression)) { \
    LWIP_PLATFORM_ASSERT(message); handler;}} while(0)
  #endif /* LWIP_ERROR */
  
  #ifdef LWIP_DEBUG
  /** print debug message only if debug message type is enabled...
   *  AND is of correct type AND is at least LWIP_DBG_LEVEL
   */
  #define LWIP_DEBUGF(debug, message) do { \
                                 if ( \
                                     ((debug) & LWIP_DBG_ON) && \
                                     ((debug) & LWIP_DBG_TYPES_ON) && \
                                     ((s16_t)((debug) & LWIP_DBG_MASK_LEVEL) >= LWIP_DBG_MIN_LEVEL)) { \
                                   LWIP_PLATFORM_DIAG(message); \
                                   if ((debug) & LWIP_DBG_HALT) { \
                                     while(1); \
                                   } \
                                 } \
                               } while(0)
  
  #else  /* LWIP_DEBUG */
  #define LWIP_DEBUGF(debug, message)
  #endif /* LWIP_DEBUG */
  
  #endif /* __LWIP_DEBUG_H__ */
  
  