1 | /*
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2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without modification,
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6 | * are permitted provided that the following conditions are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright notice,
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9 | * this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 | * this list of conditions and the following disclaimer in the documentation
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12 | * and/or other materials provided with the distribution.
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13 | * 3. The name of the author may not be used to endorse or promote products
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14 | * derived from this software without specific prior written permission.
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15 | *
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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25 | * OF SUCH DAMAGE.
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26 | *
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27 | * This file is part of the lwIP TCP/IP stack.
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28 | *
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29 | * Author: Adam Dunkels <adam@sics.se>
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30 | *
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31 | */
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32 | #ifndef __LWIP_DEF_H__
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33 | #define __LWIP_DEF_H__
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34 |
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35 | /* arch.h might define NULL already */
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36 | #include "lwip/arch.h"
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37 | #include "lwip/opt.h"
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38 |
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39 | #ifdef __cplusplus
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40 | extern "C" {
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41 | #endif
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42 |
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43 | #define LWIP_MAX(x , y) (((x) > (y)) ? (x) : (y))
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44 | #define LWIP_MIN(x , y) (((x) < (y)) ? (x) : (y))
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45 |
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46 | #ifndef NULL
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47 | #define NULL ((void *)0)
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48 | #endif
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49 |
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50 | /* Endianess-optimized shifting of two u8_t to create one u16_t */
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51 | #if BYTE_ORDER == LITTLE_ENDIAN
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52 | #define LWIP_MAKE_U16(a, b) ((a << 8) | b)
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53 | #else
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54 | #define LWIP_MAKE_U16(a, b) ((b << 8) | a)
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55 | #endif
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56 |
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57 | #ifndef LWIP_PLATFORM_BYTESWAP
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58 | #define LWIP_PLATFORM_BYTESWAP 0
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59 | #endif
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60 |
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61 | #ifndef LWIP_PREFIX_BYTEORDER_FUNCS
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62 | /* workaround for naming collisions on some platforms */
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63 |
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64 | #ifdef htons
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65 | #undef htons
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66 | #endif /* htons */
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67 | #ifdef htonl
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68 | #undef htonl
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69 | #endif /* htonl */
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70 | #ifdef ntohs
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71 | #undef ntohs
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72 | #endif /* ntohs */
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73 | #ifdef ntohl
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74 | #undef ntohl
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75 | #endif /* ntohl */
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76 |
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77 | #define htons(x) lwip_htons(x)
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78 | #define ntohs(x) lwip_ntohs(x)
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79 | #define htonl(x) lwip_htonl(x)
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80 | #define ntohl(x) lwip_ntohl(x)
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81 | #endif /* LWIP_PREFIX_BYTEORDER_FUNCS */
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82 |
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83 | #if BYTE_ORDER == BIG_ENDIAN
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84 | #define lwip_htons(x) (x)
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85 | #define lwip_ntohs(x) (x)
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86 | #define lwip_htonl(x) (x)
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87 | #define lwip_ntohl(x) (x)
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88 | #define PP_HTONS(x) (x)
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89 | #define PP_NTOHS(x) (x)
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90 | #define PP_HTONL(x) (x)
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91 | #define PP_NTOHL(x) (x)
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92 | #else /* BYTE_ORDER != BIG_ENDIAN */
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93 | #if LWIP_PLATFORM_BYTESWAP
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94 | #define lwip_htons(x) LWIP_PLATFORM_HTONS(x)
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95 | #define lwip_ntohs(x) LWIP_PLATFORM_HTONS(x)
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96 | #define lwip_htonl(x) LWIP_PLATFORM_HTONL(x)
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97 | #define lwip_ntohl(x) LWIP_PLATFORM_HTONL(x)
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98 | #else /* LWIP_PLATFORM_BYTESWAP */
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99 | u16_t lwip_htons(u16_t x);
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100 | u16_t lwip_ntohs(u16_t x);
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101 | u32_t lwip_htonl(u32_t x);
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102 | u32_t lwip_ntohl(u32_t x);
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103 | #endif /* LWIP_PLATFORM_BYTESWAP */
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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) ((((x) & 0xff) << 8) | (((x) & 0xff00) >> 8))
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109 | #define PP_NTOHS(x) PP_HTONS(x)
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110 | #define PP_HTONL(x) ((((x) & 0xff) << 24) | \
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111 | (((x) & 0xff00) << 8) | \
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112 | (((x) & 0xff0000UL) >> 8) | \
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113 | (((x) & 0xff000000UL) >> 24))
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114 | #define PP_NTOHL(x) PP_HTONL(x)
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115 |
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116 | #endif /* BYTE_ORDER == BIG_ENDIAN */
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117 |
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118 | #ifdef __cplusplus
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119 | }
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120 | #endif
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121 |
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122 | #endif /* __LWIP_DEF_H__ */
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123 |
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