mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
24b7bf2746
* configure.ac (gl_cv_header_working_endian_h): Remove temporary workaround for Android. * lib/endian.in.h: Copy latest version from Gnulib.
253 lines
4.4 KiB
C
253 lines
4.4 KiB
C
/* endian.h - Byte order macros
|
|
|
|
Copyright 2024 Free Software Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Collin Funk. */
|
|
|
|
#ifndef _@GUARD_PREFIX@_ENDIAN_H
|
|
|
|
#if __GNUC__ >= 3
|
|
@PRAGMA_SYSTEM_HEADER@
|
|
#endif
|
|
@PRAGMA_COLUMNS@
|
|
|
|
#if @HAVE_ENDIAN_H@
|
|
|
|
/* The include_next requires a split double-inclusion guard. */
|
|
# @INCLUDE_NEXT@ @NEXT_ENDIAN_H@
|
|
|
|
#endif
|
|
|
|
|
|
/* glibc defines all macros and functions but is missing types from
|
|
stdint.h. */
|
|
#if @ENDIAN_H_JUST_MISSING_STDINT@
|
|
# include <stdint.h>
|
|
#else
|
|
|
|
/* Others platforms. */
|
|
#ifndef _@GUARD_PREFIX@_ENDIAN_H
|
|
#define _@GUARD_PREFIX@_ENDIAN_H 1
|
|
|
|
/* This file uses _GL_INLINE, WORDS_BIGENDIAN. */
|
|
#if !_GL_CONFIG_H_INCLUDED
|
|
#error "Please include config.h first."
|
|
#endif
|
|
|
|
/* Define uint16_t and uint32_t.
|
|
Define uint64_t if it is available. */
|
|
#include <stdint.h>
|
|
|
|
/* Byteswap functions. */
|
|
#include <byteswap.h>
|
|
|
|
_GL_INLINE_HEADER_BEGIN
|
|
#ifndef _GL_ENDIAN_INLINE
|
|
# define _GL_ENDIAN_INLINE _GL_INLINE
|
|
#endif
|
|
|
|
#define LITTLE_ENDIAN 1234
|
|
#define BIG_ENDIAN 4321
|
|
#define PDP_ENDIAN 3412
|
|
|
|
#ifdef WORDS_BIGENDIAN
|
|
# define BYTE_ORDER BIG_ENDIAN
|
|
#else
|
|
# define BYTE_ORDER LITTLE_ENDIAN
|
|
#endif
|
|
|
|
#if @HAVE_ENDIAN_H@
|
|
|
|
/* Make sure we don't have any system definitions. */
|
|
# undef be16toh
|
|
# undef be32toh
|
|
# undef be64toh
|
|
# undef htobe16
|
|
# undef htobe32
|
|
# undef htobe64
|
|
# undef le16toh
|
|
# undef le32toh
|
|
# undef le64toh
|
|
# undef htole16
|
|
# undef htole32
|
|
# undef htole64
|
|
|
|
/* Define our own. */
|
|
# define be16toh rpl_endian_be16toh
|
|
# define be32toh rpl_endian_be32toh
|
|
# define be64toh rpl_endian_be64toh
|
|
# define htobe16 rpl_endian_htobe16
|
|
# define htobe32 rpl_endian_htobe32
|
|
# define htobe64 rpl_endian_htobe64
|
|
# define le16toh rpl_endian_le16toh
|
|
# define le32toh rpl_endian_le32toh
|
|
# define le64toh rpl_endian_le64toh
|
|
# define htole16 rpl_endian_htole16
|
|
# define htole32 rpl_endian_htole32
|
|
# define htole64 rpl_endian_htole64
|
|
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Big endian to host. */
|
|
|
|
_GL_ENDIAN_INLINE uint16_t
|
|
be16toh (uint16_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return x;
|
|
#else
|
|
return bswap_16 (x);
|
|
#endif
|
|
}
|
|
|
|
_GL_ENDIAN_INLINE uint32_t
|
|
be32toh (uint32_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return x;
|
|
#else
|
|
return bswap_32 (x);
|
|
#endif
|
|
}
|
|
|
|
#ifdef UINT64_MAX
|
|
_GL_ENDIAN_INLINE uint64_t
|
|
be64toh (uint64_t x)
|
|
{
|
|
# if BYTE_ORDER == BIG_ENDIAN
|
|
return x;
|
|
# else
|
|
return bswap_64 (x);
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
/* Host to big endian. */
|
|
|
|
_GL_ENDIAN_INLINE uint16_t
|
|
htobe16 (uint16_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return x;
|
|
#else
|
|
return bswap_16 (x);
|
|
#endif
|
|
}
|
|
|
|
_GL_ENDIAN_INLINE uint32_t
|
|
htobe32 (uint32_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return x;
|
|
#else
|
|
return bswap_32 (x);
|
|
#endif
|
|
}
|
|
|
|
#ifdef UINT64_MAX
|
|
_GL_ENDIAN_INLINE uint64_t
|
|
htobe64 (uint64_t x)
|
|
{
|
|
# if BYTE_ORDER == BIG_ENDIAN
|
|
return x;
|
|
# else
|
|
return bswap_64 (x);
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
/* Little endian to host. */
|
|
|
|
_GL_ENDIAN_INLINE uint16_t
|
|
le16toh (uint16_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return bswap_16 (x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
|
|
_GL_ENDIAN_INLINE uint32_t
|
|
le32toh (uint32_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return bswap_32 (x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
|
|
#ifdef UINT64_MAX
|
|
_GL_ENDIAN_INLINE uint64_t
|
|
le64toh (uint64_t x)
|
|
{
|
|
# if BYTE_ORDER == BIG_ENDIAN
|
|
return bswap_64 (x);
|
|
# else
|
|
return x;
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
/* Host to little endian. */
|
|
|
|
_GL_ENDIAN_INLINE uint16_t
|
|
htole16 (uint16_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return bswap_16 (x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
|
|
_GL_ENDIAN_INLINE uint32_t
|
|
htole32 (uint32_t x)
|
|
{
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
return bswap_32 (x);
|
|
#else
|
|
return x;
|
|
#endif
|
|
}
|
|
|
|
#ifdef UINT64_MAX
|
|
_GL_ENDIAN_INLINE uint64_t
|
|
htole64 (uint64_t x)
|
|
{
|
|
# if BYTE_ORDER == BIG_ENDIAN
|
|
return bswap_64 (x);
|
|
# else
|
|
return x;
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
_GL_INLINE_HEADER_END
|
|
|
|
#endif /* @ENDIAN_H_JUST_MISSING_STDINT@ */
|
|
#endif /* _@GUARD_PREFIX@_ENDIAN_H */
|
|
#endif /* _@GUARD_PREFIX@_ENDIAN_H */
|