1/** 2 * @file 3 * various utility macros 4 */ 5 6/* 7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without modification, 11 * are permitted provided that the following conditions are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 30 * OF SUCH DAMAGE. 31 * 32 * This file is part of the lwIP TCP/IP stack. 33 * 34 * Author: Adam Dunkels <adam@sics.se> 35 * 36 */ 37#ifndef LWIP_HDR_DEF_H 38#define LWIP_HDR_DEF_H 39 40/* arch.h might define NULL already */ 41#include "lwip/arch.h" 42#include "lwip/opt.h" 43#if LWIP_PERF 44#include "arch/perf.h" 45#else /* LWIP_PERF */ 46#define PERF_START /* null definition */ 47#define PERF_STOP(x) /* null definition */ 48#endif /* LWIP_PERF */ 49 50#ifdef __cplusplus 51extern "C" { 52#endif 53 54#define LWIP_MAX(x , y) (((x) > (y)) ? (x) : (y)) 55#define LWIP_MIN(x , y) (((x) < (y)) ? (x) : (y)) 56 57/* Get the number of entries in an array ('x' must NOT be a pointer!) */ 58#define LWIP_ARRAYSIZE(x) (sizeof(x)/sizeof((x)[0])) 59 60/** Create u32_t value from bytes */ 61#define LWIP_MAKEU32(a,b,c,d) (((u32_t)((a) & 0xff) << 24) | \ 62 ((u32_t)((b) & 0xff) << 16) | \ 63 ((u32_t)((c) & 0xff) << 8) | \ 64 (u32_t)((d) & 0xff)) 65 66#ifndef NULL 67#ifdef __cplusplus 68#define NULL 0 69#else 70#define NULL ((void *)0) 71#endif 72#endif 73 74#if BYTE_ORDER == BIG_ENDIAN 75#define lwip_htons(x) (x) 76#define lwip_ntohs(x) (x) 77#define lwip_htonl(x) (x) 78#define lwip_ntohl(x) (x) 79#define PP_HTONS(x) (x) 80#define PP_NTOHS(x) (x) 81#define PP_HTONL(x) (x) 82#define PP_NTOHL(x) (x) 83#else /* BYTE_ORDER != BIG_ENDIAN */ 84#ifndef lwip_htons 85u16_t lwip_htons(u16_t x); 86#endif 87#define lwip_ntohs(x) lwip_htons(x) 88 89#ifndef lwip_htonl 90u32_t lwip_htonl(u32_t x); 91#endif 92#define lwip_ntohl(x) lwip_htonl(x) 93 94/* Provide usual function names as macros for users, but this can be turned off */ 95#ifndef LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS 96#define htons(x) lwip_htons(x) 97#define ntohs(x) lwip_ntohs(x) 98#define htonl(x) lwip_htonl(x) 99#define ntohl(x) lwip_ntohl(x) 100#endif 101 102/* These macros should be calculated by the preprocessor and are used 103 with compile-time constants only (so that there is no little-endian 104 overhead at runtime). */ 105#define PP_HTONS(x) ((((x) & 0x00ffUL) << 8) | (((x) & 0xff00UL) >> 8)) 106#define PP_NTOHS(x) PP_HTONS(x) 107#define PP_HTONL(x) ((((x) & 0x000000ffUL) << 24) | \ 108 (((x) & 0x0000ff00UL) << 8) | \ 109 (((x) & 0x00ff0000UL) >> 8) | \ 110 (((x) & 0xff000000UL) >> 24)) 111#define PP_NTOHL(x) PP_HTONL(x) 112 113#endif /* BYTE_ORDER == BIG_ENDIAN */ 114 115/* Functions that are not available as standard implementations. 116 * In cc.h, you can #define these to implementations available on 117 * your platform to save some code bytes if you use these functions 118 * in your application, too. 119 */ 120 121#ifndef lwip_itoa 122/* This can be #defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform */ 123void lwip_itoa(char* result, size_t bufsize, int number); 124#endif 125#ifndef lwip_strnicmp 126/* This can be #defined to strnicmp() or strncasecmp() depending on your platform */ 127int lwip_strnicmp(const char* str1, const char* str2, size_t len); 128#endif 129#ifndef lwip_stricmp 130/* This can be #defined to stricmp() or strcasecmp() depending on your platform */ 131int lwip_stricmp(const char* str1, const char* str2); 132#endif 133#ifndef lwip_strnstr 134/* This can be #defined to strnstr() depending on your platform */ 135char* lwip_strnstr(const char* buffer, const char* token, size_t n); 136#endif 137 138#ifdef __cplusplus 139} 140#endif 141 142#endif /* LWIP_HDR_DEF_H */ 143