[164] | 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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