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Diffstat (limited to 'include/usb.h')
-rw-r--r--include/usb.h15
1 files changed, 9 insertions, 6 deletions
diff --git a/include/usb.h b/include/usb.h
index fafac89..419a7e3 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -230,16 +230,12 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate);
/* big endian -> little endian conversion */
/* some CPUs are already little endian e.g. the ARM920T */
-#ifdef LITTLEENDIAN
-#define swap_16(x) ((unsigned short)(x))
-#define swap_32(x) ((unsigned long)(x))
-#else
-#define swap_16(x) \
+#define __swap_16(x) \
({ unsigned short x_ = (unsigned short)x; \
(unsigned short)( \
((x_ & 0x00FFU) << 8) | ((x_ & 0xFF00U) >> 8) ); \
})
-#define swap_32(x) \
+#define __swap_32(x) \
({ unsigned long x_ = (unsigned long)x; \
(unsigned long)( \
((x_ & 0x000000FFUL) << 24) | \
@@ -247,6 +243,13 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate);
((x_ & 0x00FF0000UL) >> 8) | \
((x_ & 0xFF000000UL) >> 24) ); \
})
+
+#ifdef LITTLEENDIAN
+# define swap_16(x) (x)
+# define swap_32(x) (x)
+#else
+# define swap_16(x) __swap_16(x)
+# define swap_32(x) __swap_32(x)
#endif /* LITTLEENDIAN */
/*