source: mainline/uspace/lib/c/include/byteorder.h@ 9bfa8c8

/*
 * SPDX-FileCopyrightText: 2005 Jakub Jermar
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */

#ifndef _LIBC_BYTEORDER_H_
#define _LIBC_BYTEORDER_H_

#include <stdint.h>

#if !(defined(__BE__) ^ defined(__LE__))
#error The architecture must be either big-endian or little-endian.
#endif

#ifdef __BE__

#define uint16_t_le2host(n)  (uint16_t_byteorder_swap(n))
#define uint32_t_le2host(n)  (uint32_t_byteorder_swap(n))
#define uint64_t_le2host(n)  (uint64_t_byteorder_swap(n))

#define uint16_t_be2host(n)  (n)
#define uint32_t_be2host(n)  (n)
#define uint64_t_be2host(n)  (n)

#define host2uint16_t_le(n)  (uint16_t_byteorder_swap(n))
#define host2uint32_t_le(n)  (uint32_t_byteorder_swap(n))
#define host2uint64_t_le(n)  (uint64_t_byteorder_swap(n))

#define host2uint16_t_be(n)  (n)
#define host2uint32_t_be(n)  (n)
#define host2uint64_t_be(n)  (n)

#else

#define uint16_t_le2host(n)  (n)
#define uint32_t_le2host(n)  (n)
#define uint64_t_le2host(n)  (n)

#define uint16_t_be2host(n)  (uint16_t_byteorder_swap(n))
#define uint32_t_be2host(n)  (uint32_t_byteorder_swap(n))
#define uint64_t_be2host(n)  (uint64_t_byteorder_swap(n))

#define host2uint16_t_le(n)  (n)
#define host2uint32_t_le(n)  (n)
#define host2uint64_t_le(n)  (n)

#define host2uint16_t_be(n)  (uint16_t_byteorder_swap(n))
#define host2uint32_t_be(n)  (uint32_t_byteorder_swap(n))
#define host2uint64_t_be(n)  (uint64_t_byteorder_swap(n))

#endif

#define htons(n)  host2uint16_t_be((n))
#define htonl(n)  host2uint32_t_be((n))
#define ntohs(n)  uint16_t_be2host((n))
#define ntohl(n)  uint32_t_be2host((n))

#define uint8_t_be2host(n)  (n)
#define uint8_t_le2host(n)  (n)
#define host2uint8_t_be(n)  (n)
#define host2uint8_t_le(n)  (n)
#define host2uint8_t_le(n)  (n)

#define  int8_t_le2host(n)  uint8_t_le2host(n)
#define int16_t_le2host(n) uint16_t_le2host(n)
#define int32_t_le2host(n) uint32_t_le2host(n)
#define int64_t_le2host(n) uint64_t_le2host(n)

#define  int8_t_be2host(n)  uint8_t_be2host(n)
#define int16_t_be2host(n) uint16_t_be2host(n)
#define int32_t_be2host(n) uint32_t_be2host(n)
#define int64_t_be2host(n) uint64_t_be2host(n)

#define  host2int8_t_le(n)  host2uint8_t_le(n)
#define host2int16_t_le(n) host2uint16_t_le(n)
#define host2int32_t_le(n) host2uint32_t_le(n)
#define host2int64_t_le(n) host2uint64_t_le(n)

#define  host2int8_t_be(n)  host2uint8_t_be(n)
#define host2int16_t_be(n) host2uint16_t_be(n)
#define host2int32_t_be(n) host2uint32_t_be(n)
#define host2int64_t_be(n) host2uint64_t_be(n)

static inline uint64_t uint64_t_byteorder_swap(uint64_t n)
{
        return ((n & 0xff) << 56) |
            ((n & 0xff00) << 40) |
            ((n & 0xff0000) << 24) |
            ((n & 0xff000000LL) << 8) |
            ((n & 0xff00000000LL) >> 8) |
            ((n & 0xff0000000000LL) >> 24) |
            ((n & 0xff000000000000LL) >> 40) |
            ((n & 0xff00000000000000LL) >> 56);
}

static inline uint32_t uint32_t_byteorder_swap(uint32_t n)
{
        return ((n & 0xff) << 24) |
            ((n & 0xff00) << 8) |
            ((n & 0xff0000) >> 8) |
            ((n & 0xff000000) >> 24);
}

static inline uint16_t uint16_t_byteorder_swap(uint16_t n)
{
        return ((n & 0xff) << 8) |
            ((n & 0xff00) >> 8);
}

#endif

/** @}
 */