128 lines
4 KiB
C
128 lines
4 KiB
C
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef __LWIP_DEF_H__
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#define __LWIP_DEF_H__
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/* arch.h might define NULL already */
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#include "lwip/arch.h"
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#include "lwip/opt.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define LWIP_MAX(x , y) (((x) > (y)) ? (x) : (y))
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#define LWIP_MIN(x , y) (((x) < (y)) ? (x) : (y))
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#ifndef NULL
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#define NULL ((void *)0)
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#endif
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/** Get the absolute difference between 2 u32_t values (correcting overflows)
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* 'a' is expected to be 'higher' (without overflow) than 'b'. */
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#define LWIP_U32_DIFF(a, b) (((a) >= (b)) ? ((a) - (b)) : (((a) + ((b) ^ 0xFFFFFFFF) + 1)))
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/* Endianess-optimized shifting of two u8_t to create one u16_t */
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define LWIP_MAKE_U16(a, b) ((a << 8) | b)
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#else
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#define LWIP_MAKE_U16(a, b) ((b << 8) | a)
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#endif
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#ifndef LWIP_PLATFORM_BYTESWAP
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#define LWIP_PLATFORM_BYTESWAP 0
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#endif
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#ifndef LWIP_PREFIX_BYTEORDER_FUNCS
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/* workaround for naming collisions on some platforms */
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#ifdef htons
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#undef htons
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#endif /* htons */
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#ifdef htonl
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#undef htonl
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#endif /* htonl */
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#ifdef ntohs
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#undef ntohs
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#endif /* ntohs */
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#ifdef ntohl
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#undef ntohl
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#endif /* ntohl */
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#define htons(x) lwip_htons(x)
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#define ntohs(x) lwip_ntohs(x)
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#define htonl(x) lwip_htonl(x)
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#define ntohl(x) lwip_ntohl(x)
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#endif /* LWIP_PREFIX_BYTEORDER_FUNCS */
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#if BYTE_ORDER == BIG_ENDIAN
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#define lwip_htons(x) (x)
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#define lwip_ntohs(x) (x)
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#define lwip_htonl(x) (x)
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#define lwip_ntohl(x) (x)
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#define PP_HTONS(x) (x)
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#define PP_NTOHS(x) (x)
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#define PP_HTONL(x) (x)
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#define PP_NTOHL(x) (x)
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#else /* BYTE_ORDER != BIG_ENDIAN */
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#if LWIP_PLATFORM_BYTESWAP
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#define lwip_htons(x) LWIP_PLATFORM_HTONS(x)
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#define lwip_ntohs(x) LWIP_PLATFORM_HTONS(x)
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#define lwip_htonl(x) LWIP_PLATFORM_HTONL(x)
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#define lwip_ntohl(x) LWIP_PLATFORM_HTONL(x)
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#else /* LWIP_PLATFORM_BYTESWAP */
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u16_t lwip_htons(u16_t x);
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u16_t lwip_ntohs(u16_t x);
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u32_t lwip_htonl(u32_t x);
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u32_t lwip_ntohl(u32_t x);
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#endif /* LWIP_PLATFORM_BYTESWAP */
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/* These macros should be calculated by the preprocessor and are used
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with compile-time constants only (so that there is no little-endian
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overhead at runtime). */
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#define PP_HTONS(x) ((((x) & 0xff) << 8) | (((x) & 0xff00) >> 8))
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#define PP_NTOHS(x) PP_HTONS(x)
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#define PP_HTONL(x) ((((x) & 0xff) << 24) | \
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(((x) & 0xff00) << 8) | \
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(((x) & 0xff0000UL) >> 8) | \
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(((x) & 0xff000000UL) >> 24))
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#define PP_NTOHL(x) PP_HTONL(x)
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#endif /* BYTE_ORDER == BIG_ENDIAN */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __LWIP_DEF_H__ */
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