From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 14 Feb 2013 22:39:57 +0000 (+0100)
Subject: utils: make le16 endian conversion functions work with arguments that have side effects
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=bd47d85d38ee5fb1fb8a37d006f51443f67a2061;p=oweals%2Flibubox.git

utils: make le16 endian conversion functions work with arguments that have side effects

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---

diff --git a/utils.h b/utils.h
index 41ea02c..71a4692 100644
--- a/utils.h
+++ b/utils.h
@@ -99,7 +99,7 @@ void clock_gettime(int type, struct timespec *tv);
 #define __LITTLE_ENDIAN LITTLE_ENDIAN
 #endif
 
-#define __u_bswap16(x) ((uint16_t)((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
+#define __u_bswap16(x) ({ uint16_t val = (x); ((uint16_t)(((val >> 8) & 0xffu) | ((val & 0xffu) << 8))); })
 
 #if _GNUC_MIN_VER(4, 2)
 #define __u_bswap32(x) __builtin_bswap32(x)