text: /**
   * @file
   * Debug messages infrastructure
   */
  
  /*
   * 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>
   *
   */
  #ifndef LWIP_HDR_DEBUG_H
  #define LWIP_HDR_DEBUG_H
  
  #include "lwip/arch.h"
  #include "lwip/opt.h"
  
  /**
   * @defgroup debugging_levels LWIP_DBG_MIN_LEVEL and LWIP_DBG_TYPES_ON values
   * @ingroup lwip_opts_debugmsg
   * @{
   */
  
  /** @name Debug level (LWIP_DBG_MIN_LEVEL)
   * @{
   */
  /** Debug level: ALL messages*/
  #define LWIP_DBG_LEVEL_ALL     0x00
  /** Debug level: Warnings. bad checksums, dropped packets, ... */
  #define LWIP_DBG_LEVEL_WARNING 0x01
  /** Debug level: Serious. memory allocation failures, ... */
  #define LWIP_DBG_LEVEL_SERIOUS 0x02
  /** Debug level: Severe */
  #define LWIP_DBG_LEVEL_SEVERE  0x03
  /**
   * @}
   */
  
  #define LWIP_DBG_MASK_LEVEL    0x03
  /* compatibility define only */
  #define LWIP_DBG_LEVEL_OFF     LWIP_DBG_LEVEL_ALL
  
  /** @name Enable/disable debug messages completely (LWIP_DBG_TYPES_ON)
   * @{
   */
  /** 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
  /**
   * @}
   */
  
  /** @name Debug message types (LWIP_DBG_TYPES_ON)
   * @{
   */
  /** 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
  /**
   * @}
   */
  
  /**
   * @}
   */
  
  /**
   * @defgroup lwip_assertions Assertion handling
   * @ingroup lwip_opts_debug
   * @{
   */
  /**
   * LWIP_NOASSERT: Disable LWIP_ASSERT checks:
   * To disable assertions define LWIP_NOASSERT in arch/cc.h.
   */
  #ifdef __DOXYGEN__
  #define LWIP_NOASSERT
  #undef LWIP_NOASSERT
  #endif
  /**
   * @}
   */
  
  #ifndef LWIP_NOASSERT
  #define LWIP_ASSERT(message, assertion) do { if (!(assertion)) { \
    LWIP_PLATFORM_ASSERT(message); }} while(0)
  #ifndef LWIP_PLATFORM_ASSERT
  #error "If you want to use LWIP_ASSERT, LWIP_PLATFORM_ASSERT(message) needs to be defined in your arch/cc.h"
  #endif
  #else  /* LWIP_NOASSERT */
  #define LWIP_ASSERT(message, assertion)
  #endif /* LWIP_NOASSERT */
  
  #ifndef LWIP_ERROR
  #ifndef LWIP_NOASSERT
  #define LWIP_PLATFORM_ERROR(message) LWIP_PLATFORM_ASSERT(message)
  #elif defined LWIP_DEBUG
  #define LWIP_PLATFORM_ERROR(message) LWIP_PLATFORM_DIAG((message))
  #else
  #define LWIP_PLATFORM_ERROR(message)
  #endif
  
  /* if "expression" isn't true, then print "message" and execute "handler" expression */
  #define LWIP_ERROR(message, expression, handler) do { if (!(expression)) { \
    LWIP_PLATFORM_ERROR(message); handler;}} while(0)
  #endif /* LWIP_ERROR */
  
  /** Enable debug message printing, but only if debug message type is enabled
   *  AND is of correct type AND is at least LWIP_DBG_LEVEL.
   */
  #ifdef __DOXYGEN__
  #define LWIP_DEBUG
  #undef LWIP_DEBUG
  #endif
  
  #ifdef LWIP_DEBUG
  #ifndef LWIP_PLATFORM_DIAG
  #error "If you want to use LWIP_DEBUG, LWIP_PLATFORM_DIAG(message) needs to be defined in your arch/cc.h"
  #endif
  #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_HDR_DEBUG_H */
  