lwip-1.4.1 (partial)
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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 /* Endianess-optimized shifting of two u8_t to create one u16_t */ 00051 #if BYTE_ORDER == LITTLE_ENDIAN 00052 #define LWIP_MAKE_U16(a, b) ((a << 8) | b) 00053 #else 00054 #define LWIP_MAKE_U16(a, b) ((b << 8) | a) 00055 #endif 00056 00057 #ifndef LWIP_PLATFORM_BYTESWAP 00058 #define LWIP_PLATFORM_BYTESWAP 0 00059 #endif 00060 00061 #ifndef LWIP_PREFIX_BYTEORDER_FUNCS 00062 /* workaround for naming collisions on some platforms */ 00063 00064 #ifdef htons 00065 #undef htons 00066 #endif /* htons */ 00067 #ifdef htonl 00068 #undef htonl 00069 #endif /* htonl */ 00070 #ifdef ntohs 00071 #undef ntohs 00072 #endif /* ntohs */ 00073 #ifdef ntohl 00074 #undef ntohl 00075 #endif /* ntohl */ 00076 00077 #define htons(x) lwip_htons(x) 00078 #define ntohs(x) lwip_ntohs(x) 00079 #define htonl(x) lwip_htonl(x) 00080 #define ntohl(x) lwip_ntohl(x) 00081 #endif /* LWIP_PREFIX_BYTEORDER_FUNCS */ 00082 00083 #if BYTE_ORDER == BIG_ENDIAN 00084 #define lwip_htons(x) (x) 00085 #define lwip_ntohs(x) (x) 00086 #define lwip_htonl(x) (x) 00087 #define lwip_ntohl(x) (x) 00088 #define PP_HTONS(x) (x) 00089 #define PP_NTOHS(x) (x) 00090 #define PP_HTONL(x) (x) 00091 #define PP_NTOHL(x) (x) 00092 #else /* BYTE_ORDER != BIG_ENDIAN */ 00093 #if LWIP_PLATFORM_BYTESWAP 00094 #define lwip_htons(x) LWIP_PLATFORM_HTONS(x) 00095 #define lwip_ntohs(x) LWIP_PLATFORM_HTONS(x) 00096 #define lwip_htonl(x) LWIP_PLATFORM_HTONL(x) 00097 #define lwip_ntohl(x) LWIP_PLATFORM_HTONL(x) 00098 #else /* LWIP_PLATFORM_BYTESWAP */ 00099 u16_t lwip_htons(u16_t x); 00100 u16_t lwip_ntohs(u16_t x); 00101 u32_t lwip_htonl(u32_t x); 00102 u32_t lwip_ntohl(u32_t x); 00103 #endif /* LWIP_PLATFORM_BYTESWAP */ 00104 00105 /* These macros should be calculated by the preprocessor and are used 00106 with compile-time constants only (so that there is no little-endian 00107 overhead at runtime). */ 00108 #define PP_HTONS(x) ((((x) & 0xff) << 8) | (((x) & 0xff00) >> 8)) 00109 #define PP_NTOHS(x) PP_HTONS(x) 00110 #define PP_HTONL(x) ((((x) & 0xff) << 24) | \ 00111 (((x) & 0xff00) << 8) | \ 00112 (((x) & 0xff0000UL) >> 8) | \ 00113 (((x) & 0xff000000UL) >> 24)) 00114 #define PP_NTOHL(x) PP_HTONL(x) 00115 00116 #endif /* BYTE_ORDER == BIG_ENDIAN */ 00117 00118 #ifdef __cplusplus 00119 } 00120 #endif 00121 00122 #endif /* __LWIP_DEF_H__ */ 00123
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