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authorLennart Poettering <lennart@poettering.net>2016-06-02 18:12:16 +0200
committerLennart Poettering <lennart@poettering.net>2016-06-06 19:59:09 +0200
commitc917a32122ac18c9b6112d67fbb815d84a053e4a (patch)
tree9dd8675e7792f75541c8c47e560063f34d087b77
parentc9d81ae858cdf0482fa4c9c37e5f5e26d615e8c4 (diff)
util-lib: add accessors for unaligned native endian words
-rw-r--r--src/basic/unaligned.h18
-rw-r--r--src/test/test-unaligned.c24
2 files changed, 42 insertions, 0 deletions
diff --git a/src/basic/unaligned.h b/src/basic/unaligned.h
index 79be645bed..7c847a3ccb 100644
--- a/src/basic/unaligned.h
+++ b/src/basic/unaligned.h
@@ -109,3 +109,21 @@ static inline void unaligned_write_le64(void *_u, uint64_t a) {
unaligned_write_le32(u, (uint32_t) a);
unaligned_write_le32(u + 4, (uint32_t) (a >> 32));
}
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define unaligned_read_ne16 unaligned_read_be16
+#define unaligned_read_ne32 unaligned_read_be32
+#define unaligned_read_ne64 unaligned_read_be64
+
+#define unaligned_write_ne16 unaligned_write_be16
+#define unaligned_write_ne32 unaligned_write_be32
+#define unaligned_write_ne64 unaligned_write_be64
+#else
+#define unaligned_read_ne16 unaligned_read_le16
+#define unaligned_read_ne32 unaligned_read_le32
+#define unaligned_read_ne64 unaligned_read_le64
+
+#define unaligned_write_ne16 unaligned_write_le16
+#define unaligned_write_ne32 unaligned_write_le32
+#define unaligned_write_ne64 unaligned_write_le64
+#endif
diff --git a/src/test/test-unaligned.c b/src/test/test-unaligned.c
index b18b3fca0e..4f64398943 100644
--- a/src/test/test-unaligned.c
+++ b/src/test/test-unaligned.c
@@ -159,7 +159,31 @@ static void test_le(void) {
assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
}
+static void test_ne(void) {
+ uint16_t x = 4711;
+ uint32_t y = 123456;
+ uint64_t z = 9876543210;
+
+ /* Note that we don't bother actually testing alignment issues in this function, after all the _ne() functions
+ * are just aliases for the _le() or _be() implementations, which we test extensively above. Hence, in this
+ * function, just ensure that they map to the right version on the local architecture. */
+
+ assert_se(unaligned_read_ne16(&x) == 4711);
+ assert_se(unaligned_read_ne32(&y) == 123456);
+ assert_se(unaligned_read_ne64(&z) == 9876543210);
+
+ unaligned_write_ne16(&x, 1);
+ unaligned_write_ne32(&y, 2);
+ unaligned_write_ne64(&z, 3);
+
+ assert_se(x == 1);
+ assert_se(y == 2);
+ assert_se(z == 3);
+}
+
int main(int argc, const char *argv[]) {
test_be();
test_le();
+ test_ne();
+ return 0;
}