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