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Added PP_HTONx/PP_NTOHx macros that can be calculated by the preprocessor (used for constants only)

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goldsimon 2010-05-16 15:55:45 +00:00
parent 03e4eb4de8
commit 81df8bdabd
1 changed files with 15 additions and 0 deletions
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15
src/include/lwip/def.h
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@ -89,6 +89,10 @@ extern "C" {
#define lwip_ntohs(x) (x) #define lwip_ntohs(x) (x)
#define lwip_htonl(x) (x) #define lwip_htonl(x) (x)
#define lwip_ntohl(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 */ #else /* BYTE_ORDER != BIG_ENDIAN */
#if LWIP_PLATFORM_BYTESWAP #if LWIP_PLATFORM_BYTESWAP
#define lwip_htons(x) LWIP_PLATFORM_HTONS(x) #define lwip_htons(x) LWIP_PLATFORM_HTONS(x)
@ -102,6 +106,17 @@ u32_t lwip_htonl(u32_t x);
u32_t lwip_ntohl(u32_t x); u32_t lwip_ntohl(u32_t x);
#endif /* LWIP_PLATFORM_BYTESWAP */ #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 */ #endif /* BYTE_ORDER == BIG_ENDIAN */
#ifdef __cplusplus #ifdef __cplusplus