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BSD compatibility for <machine/endian.h>

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Introduce <machine/_endian.h> to let target based customization of
<machine/endian.h> via

 * _LITTLE_ENDIAN,
 * _BIG_ENDIAN,
 * _PDP_ENDIAN, and
 * _BYTE_ORDER.

defines.  Add definitions expected by FreeBSD to
<machine/endian.h> like

 * _QUAD_HIGHWORD,
 * _QUAD_LOWWORD,
 * __bswap16(),
 * __bswap32(),
 * __bswap64(),
 * __htonl(),
 * __htons(),
 * __ntohl(), and
 * __ntohs().

Also, if __BSD_VISIBLE

 * LITTLE_ENDIAN,
 * BIG_ENDIAN,
 * PDP_ENDIAN, and
 * BYTE_ORDER.

Targets that define __machine_host_to_from_network_defined in
<machine/_endian.h> must provide their own implementation of

 * __htonl(),
 * __htons(),
 * __ntohl(), and
 * __ntohs(),

otherwise a default implementation is provided by <machine/endian.h>.
In case of GCC defines to builtins are used.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
This commit is contained in:
Sebastian Huber
2016-04-18 15:29:21 +02:00
committed by Corinna Vinschen
parent 7a5b452443
commit 76a2110b47
6 changed files with 163 additions and 50 deletions
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19
winsup/cygwin/include/endian.h
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@ -12,14 +12,21 @@ details. */
#define _ENDIAN_H_
#include <sys/config.h>
#include <sys/cdefs.h>
#include <bits/endian.h>
#include <machine/endian.h>
/*#ifdef __USE_BSD*/
# define LITTLE_ENDIAN __LITTLE_ENDIAN
# define BIG_ENDIAN __BIG_ENDIAN
# define PDP_ENDIAN __PDP_ENDIAN
# define BYTE_ORDER __BYTE_ORDER
# ifndef LITTLE_ENDIAN
# define LITTLE_ENDIAN __LITTLE_ENDIAN
# endif
# ifndef BIG_ENDIAN
# define BIG_ENDIAN __BIG_ENDIAN
# endif
# ifndef PDP_ENDIAN
# define PDP_ENDIAN __PDP_ENDIAN
# endif
# ifndef BYTE_ORDER
# define BYTE_ORDER __BYTE_ORDER
# endif
/*#endif*/
#if __BYTE_ORDER == __LITTLE_ENDIAN