1 | /**
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2 | * @file
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3 | * various utility macros
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * This file is part of the lwIP TCP/IP stack.
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33 | *
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34 | * Author: Adam Dunkels <adam@sics.se>
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35 | *
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36 | */
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37 |
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38 | /**
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39 | * @defgroup perf Performance measurement
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40 | * @ingroup sys_layer
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41 | * All defines related to this section must not be placed in lwipopts.h,
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42 | * but in arch/perf.h!
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43 | * Measurement calls made throughout lwip, these can be defined to nothing.
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44 | * - PERF_START: start measuring something.
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45 | * - PERF_STOP(x): stop measuring something, and record the result.
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46 | */
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47 |
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48 | #ifndef LWIP_HDR_DEF_H
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49 | #define LWIP_HDR_DEF_H
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50 |
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51 | /* arch.h might define NULL already */
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52 | #include "lwip/arch.h"
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53 | #include "lwip/opt.h"
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54 | #if LWIP_PERF
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55 | #include "arch/perf.h"
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56 | #else /* LWIP_PERF */
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57 | #define PERF_START /* null definition */
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58 | #define PERF_STOP(x) /* null definition */
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59 | #endif /* LWIP_PERF */
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60 |
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61 | #ifdef __cplusplus
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62 | extern "C" {
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63 | #endif
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64 |
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65 | #define LWIP_MAX(x , y) (((x) > (y)) ? (x) : (y))
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66 | #define LWIP_MIN(x , y) (((x) < (y)) ? (x) : (y))
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67 |
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68 | /* Get the number of entries in an array ('x' must NOT be a pointer!) */
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69 | #define LWIP_ARRAYSIZE(x) (sizeof(x)/sizeof((x)[0]))
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70 |
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71 | /** Create u32_t value from bytes */
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72 | #define LWIP_MAKEU32(a,b,c,d) (((u32_t)((a) & 0xff) << 24) | \
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73 | ((u32_t)((b) & 0xff) << 16) | \
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74 | ((u32_t)((c) & 0xff) << 8) | \
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75 | (u32_t)((d) & 0xff))
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76 |
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77 | #ifndef NULL
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78 | #ifdef __cplusplus
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79 | #define NULL 0
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80 | #else
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81 | #define NULL ((void *)0)
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82 | #endif
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83 | #endif
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84 |
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85 | #if BYTE_ORDER == BIG_ENDIAN
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86 | #define lwip_htons(x) ((u16_t)(x))
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87 | #define lwip_ntohs(x) ((u16_t)(x))
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88 | #define lwip_htonl(x) ((u32_t)(x))
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89 | #define lwip_ntohl(x) ((u32_t)(x))
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90 | #define PP_HTONS(x) ((u16_t)(x))
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91 | #define PP_NTOHS(x) ((u16_t)(x))
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92 | #define PP_HTONL(x) ((u32_t)(x))
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93 | #define PP_NTOHL(x) ((u32_t)(x))
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94 | #else /* BYTE_ORDER != BIG_ENDIAN */
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95 | #ifndef lwip_htons
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96 | u16_t lwip_htons(u16_t x);
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97 | #endif
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98 | #define lwip_ntohs(x) lwip_htons(x)
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99 |
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100 | #ifndef lwip_htonl
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101 | u32_t lwip_htonl(u32_t x);
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102 | #endif
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103 | #define lwip_ntohl(x) lwip_htonl(x)
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104 |
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105 | /* These macros should be calculated by the preprocessor and are used
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106 | with compile-time constants only (so that there is no little-endian
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107 | overhead at runtime). */
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108 | #define PP_HTONS(x) ((u16_t)((((x) & (u16_t)0x00ffU) << 8) | (((x) & (u16_t)0xff00U) >> 8)))
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109 | #define PP_NTOHS(x) PP_HTONS(x)
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110 | #define PP_HTONL(x) ((((x) & (u32_t)0x000000ffUL) << 24) | \
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111 | (((x) & (u32_t)0x0000ff00UL) << 8) | \
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112 | (((x) & (u32_t)0x00ff0000UL) >> 8) | \
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113 | (((x) & (u32_t)0xff000000UL) >> 24))
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114 | #define PP_NTOHL(x) PP_HTONL(x)
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115 | #endif /* BYTE_ORDER == BIG_ENDIAN */
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116 |
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117 | /* Provide usual function names as macros for users, but this can be turned off */
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118 | #ifndef LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS
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119 | #define htons(x) lwip_htons(x)
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120 | #define ntohs(x) lwip_ntohs(x)
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121 | #define htonl(x) lwip_htonl(x)
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122 | #define ntohl(x) lwip_ntohl(x)
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123 | #endif
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124 |
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125 | /* Functions that are not available as standard implementations.
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126 | * In cc.h, you can #define these to implementations available on
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127 | * your platform to save some code bytes if you use these functions
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128 | * in your application, too.
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129 | */
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130 |
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131 | #ifndef lwip_itoa
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132 | /* This can be #defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform */
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133 | void lwip_itoa(char* result, size_t bufsize, int number);
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134 | #endif
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135 | #ifndef lwip_strnicmp
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136 | /* This can be #defined to strnicmp() or strncasecmp() depending on your platform */
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137 | int lwip_strnicmp(const char* str1, const char* str2, size_t len);
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138 | #endif
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139 | #ifndef lwip_stricmp
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140 | /* This can be #defined to stricmp() or strcasecmp() depending on your platform */
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141 | int lwip_stricmp(const char* str1, const char* str2);
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142 | #endif
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143 | #ifndef lwip_strnstr
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144 | /* This can be #defined to strnstr() depending on your platform */
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145 | char* lwip_strnstr(const char* buffer, const char* token, size_t n);
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146 | #endif
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147 |
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148 | #ifdef __cplusplus
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149 | }
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150 | #endif
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151 |
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152 | #endif /* LWIP_HDR_DEF_H */
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