From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 11 May 2012 15:05:41 +0000 (-0400)
Subject: add missing IN6_ARE_ADDR_EQUAL
X-Git-Tag: v0.9.1~60
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=b47fdcdef8e88452914636ce23ee6792f259b5dc;p=oweals%2Fmusl.git

add missing IN6_ARE_ADDR_EQUAL

written to avoid multiple conditional jumps and avoid ugly repetitive
lines in the header file.
---

diff --git a/include/netinet/in.h b/include/netinet/in.h
index 181f890c..509640b8 100644
--- a/include/netinet/in.h
+++ b/include/netinet/in.h
@@ -138,6 +138,11 @@ uint16_t ntohs(uint16_t);
 #define IN6_IS_ADDR_MC_GLOBAL(a) \
         (IN6_IS_ADDR_MULTICAST(a) && ((((uint8_t *) (a))[1] & 0xf) == 0xe))
 
+#define __ARE_4_EQUAL(a,b) \
+	(!( 0[a]-0[b] | 1[a]-1[b] | 2[a]-2[b] | 3[a]-3[b] ))
+#define IN6_ARE_ADDR_EQUAL(a,b) \
+	__ARE_4_EQUAL((const uint32_t *)(a), (const uint32_t *)(b))
+
 #define	IN_CLASSA(a)		((((in_addr_t)(a)) & 0x80000000) == 0)
 #define	IN_CLASSA_NET		0xff000000
 #define	IN_CLASSA_NSHIFT	24