[PATCH 4/8] Introduce swap_uint{16,32} functions, used in swap{l,s}
Matt Turner
mattst88 at gmail.com
Tue Aug 16 19:58:23 PDT 2011
Signed-off-by: Matt Turner <mattst88 at gmail.com>
---
include/misc.h | 30 ++++++++++++++++++++----------
1 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/include/misc.h b/include/misc.h
index d991c0a..6034c72 100644
--- a/include/misc.h
+++ b/include/misc.h
@@ -259,20 +259,30 @@ version_compare(uint16_t a_major, uint16_t a_minor,
SwapLongs((CARD32 *)(stuff + 1), LengthRestL(stuff))
/* byte swap a 32-bit value */
+static inline void swap_uint32(uint32_t *x)
+{
+ char n = ((char *) &x)[0];
+ ((char *) x)[0] = ((char *) x)[3];
+ ((char *) x)[3] = n;
+ n = ((char *) x)[1];
+ ((char *) x)[1] = ((char *) x)[2];
+ ((char *) x)[2] = n;
+}
+
#define swapl(x) do { \
- char n = ((char *) (x))[0];\
- ((char *) (x))[0] = ((char *) (x))[3];\
- ((char *) (x))[3] = n;\
- n = ((char *) (x))[1];\
- ((char *) (x))[1] = ((char *) (x))[2];\
- ((char *) (x))[2] = n;\
+ swap_uint32((uint32_t *)(x)); \
} while (0)
-/* byte swap a short */
+/* byte swap a 16-bit value */
+static inline void swap_uint16(uint16_t *x)
+{
+ char n = ((char *) x)[0];
+ ((char *) x)[0] = ((char *) x)[1];
+ ((char *) x)[1] = n;
+}
+
#define swaps(x) do { \
- char n = ((char *) (x))[0];\
- ((char *) (x))[0] = ((char *) (x))[1];\
- ((char *) (x))[1] = n;\
+ swap_uint16((uint16_t *)(x)); \
} while (0)
/* copy 32-bit value from src to dst byteswapping on the way */
--
1.7.3.4
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