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sys/byteorder: clean up implementation
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This changes the implementation to be solely build upon `endian.h`
and `unaligned.h`.

This turns `byteorder.h` basically in syntactic sugar on top of the
`<endian.h>` API, reducing the complexity of the implementation and,
hence, the maintenance effort.

Note that yields a small ROM reduction as well *yeah!*

```
make BOARD=nrf52840dk RIOT_CI_BUILD=1 BUILD_IN_DOCKER=1 -C tests/unittests
```

Yields before this commit:

```
   text	  data	   bss	   dec	   hex	filename
 417788	  2200	 28640	448628	 6d874	/data/riotbuild/riotbase/tests/unittests/bin/nrf52840dk/tests_unittests.elf
```

And with this commit:

```
   text	  data	   bss	   dec	   hex	filename
 417756	  2200	 28640	448596	 6d854	/data/riotbuild/riotbase/tests/unittests/bin/nrf52840dk/tests_unittests.elf
```
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@maribu
maribu committed Jan 30, 2024
1 parent c6c1473 commit 4a7097a
Showing 1 changed file with 31 additions and 173 deletions.
204 changes: 31 additions & 173 deletions sys/include/byteorder.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@

#include <string.h>
#include <stdint.h>
#include <endian.h>
#include "unaligned.h"

#ifdef __cplusplus
Expand Down Expand Up @@ -388,13 +389,6 @@ static inline uint64_t ntohll(uint64_t v);

/* **************************** IMPLEMENTATION ***************************** */

#ifdef HAVE_NO_BUILTIN_BSWAP16
static inline unsigned short __builtin_bswap16(unsigned short a)
{
return (a << 8) | (a >> 8);
}
#endif

static inline uint16_t byteorder_swaps(uint16_t v)
{
return __builtin_bswap16(v);
Expand All @@ -410,30 +404,19 @@ static inline uint64_t byteorder_swapll(uint64_t v)
return __builtin_bswap64(v);
}

/**
* @brief Swaps the byteorder according to the endianness (host -> le)
*/
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define _byteorder_swap_le(V, T) (V)
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define _byteorder_swap_le(V, T) (byteorder_swap ## T((V)))
#else
# error "Byte order is neither little nor big!"
#endif

static inline uint16_t byteorder_ltohs(le_uint16_t v)
{
return _byteorder_swap_le(v.u16, s);
return le16toh(v.u16);
}

static inline uint32_t byteorder_ltohl(le_uint32_t v)
{
return _byteorder_swap_le(v.u32, l);
return le32toh(v.u32);
}

static inline uint64_t byteorder_ltohll(le_uint64_t v)
{
return _byteorder_swap_le(v.u64, ll);
return le64toh(v.u64);
}

static inline be_uint16_t byteorder_ltobs(le_uint16_t v)
Expand Down Expand Up @@ -480,280 +463,155 @@ static inline le_uint64_t byteorder_btolll(be_uint64_t v)

static inline le_uint16_t byteorder_htols(uint16_t v)
{
le_uint16_t result = { _byteorder_swap_le(v, s) };
le_uint16_t result = { .u16 = htole16(v) };

return result;
}

static inline le_uint32_t byteorder_htoll(uint32_t v)
{
le_uint32_t result = { _byteorder_swap_le(v, l) };
le_uint32_t result = { .u32 = htole32(v) };

return result;
}

static inline le_uint64_t byteorder_htolll(uint64_t v)
{
le_uint64_t result = { _byteorder_swap_le(v, ll) };
le_uint64_t result = { .u64 = htole64(v) };

return result;
}

/**
* @brief Swaps the byteorder according to the endianness (host -> BE)
*/
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define _byteorder_swap(V, T) (byteorder_swap ## T((V)))
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define _byteorder_swap(V, T) (V)
#else
# error "Byte order is neither little nor big!"
#endif

static inline network_uint16_t byteorder_htons(uint16_t v)
{
network_uint16_t result = { _byteorder_swap(v, s) };
network_uint16_t result = { .u16 = htobe16(v) };

return result;
}

static inline network_uint32_t byteorder_htonl(uint32_t v)
{
network_uint32_t result = { _byteorder_swap(v, l) };
network_uint32_t result = { .u32 = htobe32(v) };

return result;
}

static inline network_uint64_t byteorder_htonll(uint64_t v)
{
network_uint64_t result = { _byteorder_swap(v, ll) };
network_uint64_t result = { .u64 = htobe64(v) };

return result;
}

static inline uint16_t byteorder_ntohs(network_uint16_t v)
{
return _byteorder_swap(v.u16, s);
return be16toh(v.u16);
}

static inline uint32_t byteorder_ntohl(network_uint32_t v)
{
return _byteorder_swap(v.u32, l);
return be32toh(v.u32);
}

static inline uint64_t byteorder_ntohll(network_uint64_t v)
{
return _byteorder_swap(v.u64, ll);
return be64toh(v.u64);
}

static inline uint16_t htons(uint16_t v)
{
return byteorder_htons(v).u16;
return htobe16(v);
}

static inline uint32_t htonl(uint32_t v)
{
return byteorder_htonl(v).u32;
return htobe32(v);
}

static inline uint64_t htonll(uint64_t v)
{
return byteorder_htonll(v).u64;
return htobe64(v);
}

static inline uint16_t ntohs(uint16_t v)
{
network_uint16_t input = { v };

return byteorder_ntohs(input);
return be16toh(v);
}

static inline uint32_t ntohl(uint32_t v)
{
network_uint32_t input = { v };

return byteorder_ntohl(input);
return be32toh(v);
}

static inline uint64_t ntohll(uint64_t v)
{
network_uint64_t input = { v };

return byteorder_ntohll(input);
return be64toh(v);
}

static inline uint16_t byteorder_bebuftohs(const uint8_t *buf)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
return (uint16_t)((buf[0] << 8) | (buf[1] << 0));
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
/* big endian to big endian conversion is easy, but buffer might be
* unaligned */
return unaligned_get_u16(buf);
#endif
return be16toh(unaligned_get_u16(buf));
}

static inline uint32_t byteorder_bebuftohl(const uint8_t *buf)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
return (((uint32_t) buf[0] << 24)
| ((uint32_t) buf[1] << 16)
| ((uint32_t) buf[2] << 8)
| ((uint32_t) buf[3] << 0));
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
/* big endian to big endian conversion is easy, but buffer might be
* unaligned */
return unaligned_get_u32(buf);
#endif
return be32toh(unaligned_get_u32(buf));
}

static inline uint64_t byteorder_bebuftohll(const uint8_t *buf)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
return (((uint64_t) buf[0] << 56)
| ((uint64_t) buf[1] << 48)
| ((uint64_t) buf[2] << 40)
| ((uint64_t) buf[3] << 32)
| ((uint64_t) buf[4] << 24)
| ((uint64_t) buf[5] << 16)
| ((uint64_t) buf[6] << 8)
| ((uint64_t) buf[7] << 0));
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
/* big endian to big endian conversion is easy, but buffer might be
* unaligned */
return unaligned_get_u64(buf);
#endif
return be64toh(unaligned_get_u64(buf));
}

static inline void byteorder_htobebufs(uint8_t *buf, uint16_t val)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
buf[0] = (uint8_t)(val >> 8);
buf[1] = (uint8_t)(val >> 0);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
/* big endian to big endian conversion is easy, but buffer might be
* unaligned */
val = htobe16(val);
memcpy(buf, &val, sizeof(val));
#endif
}

static inline void byteorder_htobebufl(uint8_t *buf, uint32_t val)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
buf[0] = (uint8_t)(val >> 24);
buf[1] = (uint8_t)(val >> 16);
buf[2] = (uint8_t)(val >> 8);
buf[3] = (uint8_t)(val >> 0);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
/* big endian to big endian conversion is easy, but buffer might be
* unaligned */
val = htobe32(val);
memcpy(buf, &val, sizeof(val));
#endif
}

static inline void byteorder_htobebufll(uint8_t *buf, uint64_t val)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
buf[0] = (uint8_t)(val >> 56);
buf[1] = (uint8_t)(val >> 48);
buf[2] = (uint8_t)(val >> 40);
buf[3] = (uint8_t)(val >> 32);
buf[4] = (uint8_t)(val >> 24);
buf[5] = (uint8_t)(val >> 16);
buf[6] = (uint8_t)(val >> 8);
buf[7] = (uint8_t)(val >> 0);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
/* big endian to big endian conversion is easy, but buffer might be
* unaligned */
val = htobe64(val);
memcpy(buf, &val, sizeof(val));
#endif
}

static inline uint16_t byteorder_lebuftohs(const uint8_t *buf)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
/* little endian to little endian conversion is easy, but buffer might be
* unaligned */
return unaligned_get_u16(buf);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
return (uint16_t)((buf[0] << 8) | (buf[1] << 0));
#endif
return le16toh(unaligned_get_u16(buf));
}

static inline uint32_t byteorder_lebuftohl(const uint8_t *buf)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
/* little endian to little endian conversion is easy, but buffer might be
* unaligned */
return unaligned_get_u32(buf);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
return (((uint32_t) buf[0] << 24)
| ((uint32_t) buf[1] << 16)
| ((uint32_t) buf[2] << 8)
| ((uint32_t) buf[3] << 0));
#endif
return le32toh(unaligned_get_u32(buf));
}

static inline uint64_t byteorder_lebuftohll(const uint8_t *buf)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
/* little endian to little endian conversion is easy, but buffer might be
* unaligned */
return unaligned_get_u64(buf);
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
return (((uint64_t) buf[0] << 56)
| ((uint64_t) buf[1] << 48)
| ((uint64_t) buf[2] << 40)
| ((uint64_t) buf[3] << 32)
| ((uint64_t) buf[4] << 24)
| ((uint64_t) buf[5] << 16)
| ((uint64_t) buf[6] << 8)
| ((uint64_t) buf[7] << 0));
#endif
return le64toh(unaligned_get_u64(buf));
}

static inline void byteorder_htolebufs(uint8_t *buf, uint16_t val)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
/* little endian to little endian conversion is easy, but buffer might be
* unaligned */
val = htole16(val);
memcpy(buf, &val, sizeof(val));
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
buf[0] = (uint8_t)(val >> 8);
buf[1] = (uint8_t)(val >> 0);
#endif
}

static inline void byteorder_htolebufl(uint8_t *buf, uint32_t val)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
/* little endian to little endian conversion is easy, but buffer might be
* unaligned */
val = htole32(val);
memcpy(buf, &val, sizeof(val));
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
buf[0] = (uint8_t)(val >> 24);
buf[1] = (uint8_t)(val >> 16);
buf[2] = (uint8_t)(val >> 8);
buf[3] = (uint8_t)(val >> 0);
#endif
}

static inline void byteorder_htolebufll(uint8_t *buf, uint64_t val)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
/* little endian to little endian conversion is easy, but buffer might be
* unaligned */
val = htole64(val);
memcpy(buf, &val, sizeof(val));
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
buf[0] = (uint8_t)(val >> 56);
buf[1] = (uint8_t)(val >> 48);
buf[2] = (uint8_t)(val >> 40);
buf[3] = (uint8_t)(val >> 32);
buf[4] = (uint8_t)(val >> 24);
buf[5] = (uint8_t)(val >> 16);
buf[6] = (uint8_t)(val >> 8);
buf[7] = (uint8_t)(val >> 0);
#endif
}

#ifdef __cplusplus
Expand Down

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