1 files changed, 118 insertions, 0 deletions
diff --git a/include/flatcc/portable/pendian_detect.h b/include/flatcc/portable/pendian_detect.h
new file mode 100644
index 0000000..1dd62c0
--- /dev/null
+++ b/include/flatcc/portable/pendian_detect.h
@@ -0,0 +1,118 @@
+/*
+ * Uses various known flags to decide endianness and defines:
+ *
+ * __LITTLE_ENDIAN__ or __BIG_ENDIAN__ if not already defined
+ *
+ * and also defines
+ *
+ * __BYTE_ORDER__ to either __ORDER_LITTLE_ENDIAN__ or
+ * __ORDER_BIG_ENDIAN__ if not already defined
+ *
+ * If none of these could be set, __UNKNOWN_ENDIAN__ is defined,
+ * which is not a known flag. If __BYTE_ORDER__ is defined but
+ * not big or little endian, __UNKNOWN_ENDIAN__ is also defined.
+ *
+ * Note: Some systems define __BYTE_ORDER without __ at the end
+ * - this will be mapped to to __BYTE_ORDER__.
+ */
+
+#ifndef PENDIAN_DETECT
+#define PENDIAN_DETECT
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __ORDER_LITTLE_ENDIAN__
+#define __ORDER_LITTLE_ENDIAN__ 1234
+#endif
+
+#ifndef __ORDER_BIG_ENDIAN__
+#define __ORDER_BIG_ENDIAN__ 4321
+#endif
+
+#ifdef __BYTE_ORDER__
+
+#if defined(__LITTLE_ENDIAN__) && __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
+#error __LITTLE_ENDIAN__ inconsistent with __BYTE_ORDER__
+#endif
+
+#if defined(__BIG_ENDIAN__) && __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
+#error __BIG_ENDIAN__ inconsistent with __BYTE_ORDER__
+#endif
+
+#else /* __BYTE_ORDER__ */
+
+
+#if                                                                         \
+  defined(__LITTLE_ENDIAN__) ||                                             \
+  (defined(__BYTE_ORDER) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN) ||       \
+  defined(__ARMEL__) || defined(__THUMBEL__) ||                             \
+  defined(__AARCH64EL__) ||                                                 \
+  (defined(_MSC_VER) && defined(_M_ARM)) ||                                 \
+  defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__) ||           \
+  defined(_M_X64) || defined(_M_IX86) || defined(_M_I86) ||                 \
+  defined(__i386__) || defined(__alpha__) ||                                \
+  defined(__ia64) || defined(__ia64__) ||                                   \
+  defined(_M_IA64) || defined(_M_ALPHA) ||                                  \
+  defined(__amd64) || defined(__amd64__) || defined(_M_AMD64) ||            \
+  defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) ||            \
+  defined(__bfin__)
+
+#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
+
+#endif
+
+#if                                                                         \
+  defined (__BIG_ENDIAN__) ||                                               \
+  (defined(__BYTE_ORDER) && __BYTE_ORDER == __ORDER_BIG_ENDIAN) ||          \
+  defined(__ARMEB__) || defined(THUMBEB__) || defined (__AARCH64EB__) ||    \
+  defined(_MIPSEB) || defined(__MIPSEB) || defined(__MIPSEB__) ||           \
+  defined(__sparc) || defined(__sparc__) ||                                 \
+  defined(_POWER) || defined(__powerpc__) || defined(__ppc__) ||            \
+  defined(__hpux) || defined(__hppa) || defined(__s390__)
+
+#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
+
+#endif
+
+#endif /* __BYTE_ORDER__ */
+
+#ifdef __BYTE_ORDER__
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+
+#ifndef __LITTLE_ENDIAN__
+#define __LITTLE_ENDIAN__ 1
+#endif
+
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+
+#ifndef __BIG_ENDIAN__
+#define __BIG_ENDIAN__ 1
+#endif
+
+#else
+
+/*
+ * Custom extension - we only define __BYTE_ORDER__ if known big or little.
+ * User code that understands __BYTE_ORDER__ may also assume unkown if
+ * it is not defined by now - this will allow other endian formats than
+ * big or little when supported by compiler.
+ */
+#ifndef __UNKNOWN_ENDIAN__
+#define __UNKNOWN_ENDIAN__ 1
+#endif
+
+#endif
+#endif /* __BYTE_ORDER__ */
+
+#if defined(__LITTLE_ENDIAN__) && defined(__BIG_ENDIAN__)
+#error conflicting definitions of __LITTLE_ENDIAN__ and __BIG_ENDIAN__
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PENDIAN_DETECT */