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Diffstat (limited to 'include/compat/endian.h')
| -rw-r--r-- | include/compat/endian.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/include/compat/endian.h b/include/compat/endian.h new file mode 100644 index 0000000..fe6ee83 --- /dev/null +++ b/include/compat/endian.h @@ -0,0 +1,80 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2013, 2022 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#ifndef COMPAT_ENDIAN_H +#define COMPAT_ENDIAN_H + +#ifndef BYTE_ORDER +# undef LITTLE_ENDIAN +# define LITTLE_ENDIAN 1234 +# undef BIG_ENDIAN +# define BIG_ENDIAN 4321 +# undef UNKNOWN_ENDIAN +# define UNKNOWN_ENDIAN 0 + +/* + * Attempt to guess endianness. + * Solaris may define _LITTLE_ENDIAN and _BIG_ENDIAN to 1 + * HP-UX may define __LITTLE_ENDIAN__ and __BIG_ENDIAN__ to 1 + * Otherwise, check for cpu-specific cpp defines. + * Note that some CPUs are bi-endian, including: arm, powerpc, alpha, + * sparc64, mips, hppa, sh4 and ia64. + * We just check for the most common uses. + */ + +# if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \ + (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) +# define BYTE_ORDER LITTLE_ENDIAN +# elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \ + (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) +# define BYTE_ORDER BIG_ENDIAN +# elif defined(__BYTE_ORDER) +# define BYTE_ORDER __BYTE_ORDER +# elif defined(_BYTE_ORDER) +# define BYTE_ORDER _BYTE_ORDER +# elif defined(_LITTLE_ENDIAN) || defined(__LITTLE_ENDIAN__) +# define BYTE_ORDER LITTLE_ENDIAN +# elif defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN__) +# define BYTE_ORDER BIG_ENDIAN +# elif defined(__alpha__) || defined(__alpha) || defined(__amd64) || \ + defined(BIT_ZERO_ON_RIGHT) || defined(i386) || defined(__i386) || \ + defined(MIPSEL) || defined(_MIPSEL) || defined(ns32000) || \ + defined(__ns3200) || defined(sun386) || defined(vax) || \ + defined(__vax) || defined(__x86__) || defined(__riscv) || \ + (defined(sun) && defined(__powerpc)) || \ + (!defined(__hpux) && defined(__ia64)) +# define BYTE_ORDER LITTLE_ENDIAN +# elif defined(__68k__) || defined(apollo) || defined(BIT_ZERO_ON_LEFT) || \ + defined(__convex__) || defined(_CRAY) || defined(DGUX) || \ + defined(__hppa) || defined(__hp9000) || defined(__hp9000s300) || \ + defined(__hp9000s700) || defined(__hp3000s900) || \ + defined(ibm032) || defined(ibm370) || defined(_IBMR2) || \ + defined(is68k) || defined(mc68000) || defined(m68k) || \ + defined(__m68k) || defined(m88k) || defined(__m88k) || \ + defined(MIPSEB) || defined(_MIPSEB) || defined(MPE) || \ + defined(pyr) || defined(__powerpc) || defined(__powerpc__) || \ + defined(sel) || defined(__sparc) || defined(__sparc__) || \ + defined(tahoe) || (defined(__hpux) && defined(__ia64)) || \ + (defined(sun) && defined(__powerpc)) +# define BYTE_ORDER BIG_ENDIAN +# else +# define BYTE_ORDER UNKNOWN_ENDIAN +# endif +#endif /* BYTE_ORDER */ + +#endif /* COMPAT_ENDIAN_H */ |