summaryrefslogtreecommitdiffstats
path: root/include/compat/endian.h
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--include/compat/endian.h80
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 */