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Revert "lib: endianness: don't break strict-aliasing"

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This reverts commit 1afce9573a.

Turns out this is a misunderstanding of the C standard...  meh.
This commit is contained in:
David Lamparter 2016-06-30 14:59:53 +02:00
parent 97f30c591c
commit 81352b068d
1 changed files with 20 additions and 27 deletions
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47
lib/capnp_c.h
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@ -13,7 +13,6 @@
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#if defined(unix) && !defined(__APPLE__)
#include <endian.h>
#endif
@ -286,12 +285,10 @@ CAPN_INLINE uint16_t capn_flip16(uint16_t v) {
defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8
return __builtin_bswap16(v);
#else
uint8_t sv[2];
uint16_t ret;
sv[0] = (uint8_t)v;
sv[1] = (uint8_t)(v>>8);
memcpy(&ret, sv, sizeof(ret));
return ret;
union { uint16_t u; uint8_t v[2]; } s;
s.v[0] = (uint8_t)v;
s.v[1] = (uint8_t)(v>>8);
return s.u;
#endif
}
CAPN_INLINE uint32_t capn_flip32(uint32_t v) {
@ -301,14 +298,12 @@ CAPN_INLINE uint32_t capn_flip32(uint32_t v) {
defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8
return __builtin_bswap32(v);
#else
uint8_t sv[4];
uint32_t ret;
sv[0] = (uint8_t)v;
sv[1] = (uint8_t)(v>>8);
sv[2] = (uint8_t)(v>>16);
sv[3] = (uint8_t)(v>>24);
memcpy(&ret, sv, sizeof(ret));
return ret;
union { uint32_t u; uint8_t v[4]; } s;
s.v[0] = (uint8_t)v;
s.v[1] = (uint8_t)(v>>8);
s.v[2] = (uint8_t)(v>>16);
s.v[3] = (uint8_t)(v>>24);
return s.u;
#endif
}
CAPN_INLINE uint64_t capn_flip64(uint64_t v) {
@ -318,18 +313,16 @@ CAPN_INLINE uint64_t capn_flip64(uint64_t v) {
defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 8
return __builtin_bswap64(v);
#else
uint8_t sv[8];
uint64_t ret;
sv[0] = (uint8_t)v;
sv[1] = (uint8_t)(v>>8);
sv[2] = (uint8_t)(v>>16);
sv[3] = (uint8_t)(v>>24);
sv[4] = (uint8_t)(v>>32);
sv[5] = (uint8_t)(v>>40);
sv[6] = (uint8_t)(v>>48);
sv[7] = (uint8_t)(v>>56);
memcpy(&ret, sv, sizeof(ret));
return ret;
union { uint64_t u; uint8_t v[8]; } s;
s.v[0] = (uint8_t)v;
s.v[1] = (uint8_t)(v>>8);
s.v[2] = (uint8_t)(v>>16);
s.v[3] = (uint8_t)(v>>24);
s.v[4] = (uint8_t)(v>>32);
s.v[5] = (uint8_t)(v>>40);
s.v[6] = (uint8_t)(v>>48);
s.v[7] = (uint8_t)(v>>56);
return s.u;
#endif
}