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MFV: removes strict-aliasing warnings from GCC in tcpdump.

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Reported by:	tinderbox (gjb)
Submitted by:	glebius
MFC after:	2 weeks
This commit is contained in:
Pedro F. Giffuni 2013-11-25 18:46:08 +00:00
commit 340b342723
1 changed files with 39 additions and 14 deletions
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53
contrib/tcpdump/extract.h
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@ -51,13 +51,25 @@ typedef struct {
u_int32_t val;
} __attribute__((packed)) unaligned_u_int32_t;
#define EXTRACT_16BITS(p) \
((u_int16_t)ntohs(((const unaligned_u_int16_t *)(p))->val))
#define EXTRACT_32BITS(p) \
((u_int32_t)ntohl(((const unaligned_u_int32_t *)(p))->val))
#define EXTRACT_64BITS(p) \
((u_int64_t)(((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 0)->val)) << 32 | \
((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 1)->val)) << 0))
static inline u_int16_t
EXTRACT_16BITS(const void *p)
{
return ((u_int16_t)ntohs(((const unaligned_u_int16_t *)(p))->val));
}
static inline u_int32_t
EXTRACT_32BITS(const void *p)
{
return ((u_int32_t)ntohl(((const unaligned_u_int32_t *)(p))->val));
}
static inline u_int64_t
EXTRACT_64BITS(const void *p)
{
return ((u_int64_t)(((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 0)->val)) << 32 | \
((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 1)->val)) << 0));
}
#else /* HAVE___ATTRIBUTE__ */
/*
@ -88,13 +100,26 @@ typedef struct {
* The processor natively handles unaligned loads, so we can just
* cast the pointer and fetch through it.
*/
#define EXTRACT_16BITS(p) \
((u_int16_t)ntohs(*(const u_int16_t *)(p)))
#define EXTRACT_32BITS(p) \
((u_int32_t)ntohl(*(const u_int32_t *)(p)))
#define EXTRACT_64BITS(p) \
((u_int64_t)(((u_int64_t)ntohl(*((const u_int32_t *)(p) + 0))) << 32 | \
((u_int64_t)ntohl(*((const u_int32_t *)(p) + 1))) << 0))
static inline u_int16_t
EXTRACT_16BITS(const void *p)
{
return ((u_int16_t)ntohs(*(const u_int16_t *)(p)));
}
static inline u_int32_t
EXTRACT_32BITS(const void *p)
{
return ((u_int32_t)ntohl(*(const u_int32_t *)(p)));
}
static inline u_int64_t
EXTRACT_64BITS(const void *p)
{
return ((u_int64_t)(((u_int64_t)ntohl(*((const u_int32_t *)(p) + 0))) << 32 | \
((u_int64_t)ntohl(*((const u_int32_t *)(p) + 1))) << 0));
}
#endif /* LBL_ALIGN */
#define EXTRACT_24BITS(p) \