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 181f890..509640b 100644 (file)
--- 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