e695ed7ccd6995d6e99dfbf78c1594db4a9a4ca3
2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
27 * This file is part of the lwIP TCP/IP stack.
29 * Author: Adam Dunkels <adam@sics.se>
32 #ifndef __LWIP_DEF_H__
33 #define __LWIP_DEF_H__
35 /* arch.h might define NULL already */
36 #include "lwip/arch.h"
43 #define LWIP_MAX(x , y) (((x) > (y)) ? (x) : (y))
44 #define LWIP_MIN(x , y) (((x) < (y)) ? (x) : (y))
47 #define NULL ((void *)0)
50 /* Endianess-optimized shifting of two u8_t to create one u16_t */
51 #if BYTE_ORDER == LITTLE_ENDIAN
52 #define LWIP_MAKE_U16(a, b) ((a << 8) | b)
54 #define LWIP_MAKE_U16(a, b) ((b << 8) | a)
57 #ifndef LWIP_PLATFORM_BYTESWAP
58 #define LWIP_PLATFORM_BYTESWAP 0
61 #ifndef LWIP_PREFIX_BYTEORDER_FUNCS
62 /* workaround for naming collisions on some platforms */
77 #define htons(x) lwip_htons(x)
78 #define ntohs(x) lwip_ntohs(x)
79 #define htonl(x) lwip_htonl(x)
80 #define ntohl(x) lwip_ntohl(x)
81 #endif /* LWIP_PREFIX_BYTEORDER_FUNCS */
83 #if BYTE_ORDER == BIG_ENDIAN
84 #define lwip_htons(x) (x)
85 #define lwip_ntohs(x) (x)
86 #define lwip_htonl(x) (x)
87 #define lwip_ntohl(x) (x)
88 #define PP_HTONS(x) (x)
89 #define PP_NTOHS(x) (x)
90 #define PP_HTONL(x) (x)
91 #define PP_NTOHL(x) (x)
92 #else /* BYTE_ORDER != BIG_ENDIAN */
93 #if LWIP_PLATFORM_BYTESWAP
94 #define lwip_htons(x) LWIP_PLATFORM_HTONS(x)
95 #define lwip_ntohs(x) LWIP_PLATFORM_HTONS(x)
96 #define lwip_htonl(x) LWIP_PLATFORM_HTONL(x)
97 #define lwip_ntohl(x) LWIP_PLATFORM_HTONL(x)
98 #else /* LWIP_PLATFORM_BYTESWAP */
99 u16_t
lwip_htons(u16_t x
);
100 u16_t
lwip_ntohs(u16_t x
);
101 u32_t
lwip_htonl(u32_t x
);
102 u32_t
lwip_ntohl(u32_t x
);
103 #endif /* LWIP_PLATFORM_BYTESWAP */
105 /* These macros should be calculated by the preprocessor and are used
106 with compile-time constants only (so that there is no little-endian
107 overhead at runtime). */
108 #define PP_HTONS(x) ((((x) & 0xff) << 8) | (((x) & 0xff00) >> 8))
109 #define PP_NTOHS(x) PP_HTONS(x)
110 #define PP_HTONL(x) ((((x) & 0xff) << 24) | \
111 (((x) & 0xff00) << 8) | \
112 (((x) & 0xff0000UL) >> 8) | \
113 (((x) & 0xff000000UL) >> 24))
114 #define PP_NTOHL(x) PP_HTONL(x)
116 #endif /* BYTE_ORDER == BIG_ENDIAN */
122 #endif /* __LWIP_DEF_H__ */