(res_queriesmatch): Minor optimization.

diff --git a/resolv/res_send.c b/resolv/res_send.c
index 67abedb..4bcb746 100644 (file)
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -292,9 +292,6 @@ int
 res_queriesmatch(const u_char *buf1, const u_char *eom1,
                 const u_char *buf2, const u_char *eom2)
 {
-       const u_char *cp = buf1 + HFIXEDSZ;
-       int qdcount = ntohs(((HEADER*)buf1)->qdcount);
-
        if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
                return (-1);
 
@@ -306,8 +303,16 @@ res_queriesmatch(const u_char *buf1, const u_char *eom1,
            (((HEADER *)buf2)->opcode == ns_o_update))
                return (1);
 
-       if (qdcount != ntohs(((HEADER*)buf2)->qdcount))
+       /* Note that we initially do not convert QDCOUNT to the host byte
+          order.  We can compare it with the second buffers QDCOUNT
+          value without doing this.  */
+       int qdcount = ((HEADER*)buf1)->qdcount;
+       if (qdcount != ((HEADER*)buf2)->qdcount)
                return (0);
+
+       qdcount = htons (qdcount);
+       const u_char *cp = buf1 + HFIXEDSZ;
+
        while (qdcount-- > 0) {
                char tname[MAXDNAME+1];
                int n, ttype, tclass;