[openssl] master update
Kurt Roeckx
kurt at openssl.org
Wed Oct 14 07:55:35 UTC 2020
The branch master has been updated
via 47690cd4ceb3a1cfdf097d575cb0d3cf9c6dac13 (commit)
from 8e596a93bc266259f1ef0d56601e58bbfe18317a (commit)
- Log -----------------------------------------------------------------
commit 47690cd4ceb3a1cfdf097d575cb0d3cf9c6dac13
Author: Kurt Roeckx <kurt at roeckx.be>
Date: Sat Jul 11 17:17:09 2020 +0200
Use __BYTE_ORDER__ to test the endianness when available
Reviewed-by: Paul Dale <paul.dale at oracle.com>
GH: #13085
-----------------------------------------------------------------------
Summary of changes:
include/internal/endian.h | 34 +++++++++++++++++++++++++++++++---
1 file changed, 31 insertions(+), 3 deletions(-)
diff --git a/include/internal/endian.h b/include/internal/endian.h
index f581c14b24..b4e486da3a 100644
--- a/include/internal/endian.h
+++ b/include/internal/endian.h
@@ -10,13 +10,41 @@
#ifndef OSSL_INTERNAL_ENDIAN_H
# define OSSL_INTERNAL_ENDIAN_H
-# define DECLARE_IS_ENDIAN \
+/*
+ * IS_LITTLE_ENDIAN and IS_BIG_ENDIAN can be used to detect the endiannes
+ * at compile time. To use it, DECLARE_IS_ENDIAN must be used to declare
+ * a variable.
+ *
+ * L_ENDIAN and B_ENDIAN can be used at preprocessor time. They can be set
+ * in the configarion using the lib_cppflags variable. If neither is
+ * set, it will fall back to code works with either endianness.
+ */
+
+# if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__)
+# define DECLARE_IS_ENDIAN const int ossl_is_little_endian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+# define IS_LITTLE_ENDIAN (ossl_is_little_endian)
+# define IS_BIG_ENDIAN (!ossl_is_little_endian)
+# if defined(L_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
+# error "L_ENDIAN defined on a big endian machine"
+# endif
+# if defined(B_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+# error "B_ENDIAN defined on a little endian machine"
+# endif
+# if !defined(L_ENDIAN) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+# define L_ENDIAN
+# endif
+# if !defined(B_ENDIAN) && (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__)
+# define B_ENDIAN
+# endif
+# else
+# define DECLARE_IS_ENDIAN \
const union { \
long one; \
char little; \
} ossl_is_endian = { 1 }
-# define IS_LITTLE_ENDIAN (ossl_is_endian.little != 0)
-# define IS_BIG_ENDIAN (ossl_is_endian.little == 0)
+# define IS_LITTLE_ENDIAN (ossl_is_endian.little != 0)
+# define IS_BIG_ENDIAN (ossl_is_endian.little == 0)
+# endif
#endif
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