def.h

00001 /*
00002  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
00003  * All rights reserved. 
00004  * 
00005  * Redistribution and use in source and binary forms, with or without modification, 
00006  * are permitted provided that the following conditions are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright notice,
00009  *    this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright notice,
00011  *    this list of conditions and the following disclaimer in the documentation
00012  *    and/or other materials provided with the distribution.
00013  * 3. The name of the author may not be used to endorse or promote products
00014  *    derived from this software without specific prior written permission. 
00015  *
00016  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
00017  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
00018  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
00019  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
00020  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
00021  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
00022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
00023  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
00024  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
00025  * OF SUCH DAMAGE.
00026  *
00027  * This file is part of the lwIP TCP/IP stack.
00028  * 
00029  * Author: Adam Dunkels <adam@sics.se>
00030  *
00031  */
00032 #ifndef __LWIP_DEF_H__
00033 #define __LWIP_DEF_H__
00034 
00035 /* arch.h might define NULL already */
00036 #include "lwip/arch.h"
00037 #include "lwip/opt.h"
00038 
00039 #ifdef __cplusplus
00040 extern "C" {
00041 #endif
00042 
00043 #define LWIP_MAX(x , y)  (((x) > (y)) ? (x) : (y))
00044 #define LWIP_MIN(x , y)  (((x) < (y)) ? (x) : (y))
00045 
00046 #ifndef NULL
00047 #define NULL ((void *)0)
00048 #endif
00049 
00050 #ifdef htons
00051 #undef htons
00052 #endif /* htons */
00053 #ifdef htonl
00054 #undef htonl
00055 #endif /* htonl */
00056 #ifdef ntohs
00057 #undef ntohs
00058 #endif /* ntohs */
00059 #ifdef ntohl
00060 #undef ntohl
00061 #endif /* ntohl */
00062 
00063 #ifndef LWIP_PLATFORM_BYTESWAP
00064 #define LWIP_PLATFORM_BYTESWAP 0
00065 #endif
00066 
00067 #if BYTE_ORDER == BIG_ENDIAN
00068 #define htons(x) (x)
00069 #define ntohs(x) (x)
00070 #define htonl(x) (x)
00071 #define ntohl(x) (x)
00072 #else /* BYTE_ORDER != BIG_ENDIAN */
00073 #ifdef LWIP_PREFIX_BYTEORDER_FUNCS
00074 /* workaround for naming collisions on some platforms */
00075 #define htons lwip_htons
00076 #define ntohs lwip_ntohs
00077 #define htonl lwip_htonl
00078 #define ntohl lwip_ntohl
00079 #endif /* LWIP_PREFIX_BYTEORDER_FUNCS */
00080 #if LWIP_PLATFORM_BYTESWAP
00081 #define htons(x) LWIP_PLATFORM_HTONS(x)
00082 #define ntohs(x) LWIP_PLATFORM_HTONS(x)
00083 #define htonl(x) LWIP_PLATFORM_HTONL(x)
00084 #define ntohl(x) LWIP_PLATFORM_HTONL(x)
00085 #else /* LWIP_PLATFORM_BYTESWAP */
00086 u16_t htons(u16_t x);
00087 u16_t ntohs(u16_t x);
00088 u32_t htonl(u32_t x);
00089 u32_t ntohl(u32_t x);
00090 #endif /* LWIP_PLATFORM_BYTESWAP */
00091 
00092 #endif /* BYTE_ORDER == BIG_ENDIAN */
00093 
00094 #ifdef __cplusplus
00095 }
00096 #endif
00097 
00098 #endif /* __LWIP_DEF_H__ */
00099