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 51 extern "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 85 u16_t lwip_htons(u16_t x); 86 #endif 87 #define lwip_ntohs(x) lwip_htons(x) 88 89 #ifndef lwip_htonl 90 u32_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 */ 123 void 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 */ 127 int 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 */ 131 int 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 */ 135 char* 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