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sudo-project
GitHub Repository: sudo-project/sudo
 Path: blob/main/include/compat/endian.h
1532 views
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/*

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 * SPDX-License-Identifier: ISC

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 *

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 * Copyright (c) 2013, 2022 Todd C. Miller <[email protected]>

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 *

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 * Permission to use, copy, modify, and distribute this software for any

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 * purpose with or without fee is hereby granted, provided that the above

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 * copyright notice and this permission notice appear in all copies.

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 *

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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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 */

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#ifndef COMPAT_ENDIAN_H

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#define COMPAT_ENDIAN_H

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#ifndef BYTE_ORDER

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# undef LITTLE_ENDIAN

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# define LITTLE_ENDIAN	1234

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# undef BIG_ENDIAN

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# define BIG_ENDIAN	4321

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# undef UNKNOWN_ENDIAN

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# define UNKNOWN_ENDIAN	0

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/*

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 * Attempt to guess endianness.

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 * Solaris may define _LITTLE_ENDIAN and _BIG_ENDIAN to 1

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 * HP-UX may define __LITTLE_ENDIAN__ and __BIG_ENDIAN__ to 1

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 * Otherwise, check for cpu-specific cpp defines.

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 * Note that some CPUs are bi-endian, including: arm, powerpc, alpha,

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 * sparc64, mips, hppa, sh4 and ia64.

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 * We just check for the most common uses.

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 */

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# if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \

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    (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)

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#  define BYTE_ORDER	LITTLE_ENDIAN

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# elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \

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    (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)

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#  define BYTE_ORDER	BIG_ENDIAN

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# elif defined(__BYTE_ORDER)

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#  define BYTE_ORDER	__BYTE_ORDER

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# elif defined(_BYTE_ORDER)

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#  define BYTE_ORDER	_BYTE_ORDER

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# elif defined(_LITTLE_ENDIAN) || defined(__LITTLE_ENDIAN__)

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#  define BYTE_ORDER	LITTLE_ENDIAN

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# elif defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN__)

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#  define BYTE_ORDER	BIG_ENDIAN

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# elif defined(__alpha__) || defined(__alpha) || defined(__amd64) || \

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       defined(BIT_ZERO_ON_RIGHT) || defined(i386) || defined(__i386) || \

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       defined(MIPSEL) || defined(_MIPSEL) || defined(ns32000) || \

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       defined(__ns3200) || defined(sun386) || defined(vax) || \

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       defined(__vax) || defined(__x86__) || defined(__riscv) || \

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       (defined(sun) && defined(__powerpc)) || \

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       (!defined(__hpux) && defined(__ia64))

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#  define BYTE_ORDER	LITTLE_ENDIAN

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# elif defined(__68k__) || defined(apollo) || defined(BIT_ZERO_ON_LEFT) || \

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       defined(__convex__) || defined(_CRAY) || defined(DGUX) || \

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       defined(__hppa) || defined(__hp9000) || defined(__hp9000s300) || \

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       defined(__hp9000s700) || defined(__hp3000s900) || \

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       defined(ibm032) || defined(ibm370) || defined(_IBMR2) || \

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       defined(is68k) || defined(mc68000) || defined(m68k) || \

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       defined(__m68k) || defined(m88k) || defined(__m88k) || \

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       defined(MIPSEB) || defined(_MIPSEB) || defined(MPE) || \

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       defined(pyr) || defined(__powerpc) || defined(__powerpc__) || \

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       defined(sel) || defined(__sparc) || defined(__sparc__) || \

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       defined(tahoe) || (defined(__hpux) && defined(__ia64)) || \

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       (defined(sun) && defined(__powerpc))

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#  define BYTE_ORDER	BIG_ENDIAN

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# else

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#  define BYTE_ORDER	UNKNOWN_ENDIAN

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# endif

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#endif /* BYTE_ORDER */

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#endif /* COMPAT_ENDIAN_H */

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