From 2d26a7173c076ff8f40c9bbdbff80166ff0c781d Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Sun, 15 Aug 2004 22:39:07 +0000
Subject: [PATCH] Update.

	* sysdeps/posix/getaddrinfo.c (gaih_inet): Optimize generation of
	v4-mapped addresses a bit.
	(gethosts): Move alloca out of macro, so that it is done only once.
---
 ChangeLog                   |  4 ++++
 sysdeps/posix/getaddrinfo.c | 21 +++++++++++++--------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index ef90c576fa..00d62964e2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2004-08-15  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/posix/getaddrinfo.c (gaih_inet): Optimize generation of
+	v4-mapped addresses a bit.
+	(gethosts): Move alloca out of macro, so that it is done only once.
+
 	* sysdeps/posix/getaddrinfo.c (gaih_addrtuple): Change type of
 	addr to avoid casts.
 	(gethosts): Removed.
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 23b74296c1..9de2860323 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -282,18 +282,18 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
 
 #define gethosts(_family, _type) \
  {									      \
-  int i, herrno;							      \
-  size_t tmpbuflen;							      \
+  int i;								      \
+  int herrno;								      \
   struct hostent th;							      \
-  char *tmpbuf = NULL;							      \
-  tmpbuflen = 512;							      \
   no_data = 0;								      \
-  do {									      \
-    tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);		      \
+  while (1) {								      \
     rc = 0;								      \
     status = DL_CALL_FCT (fct, (name, _family, &th, tmpbuf,		      \
            tmpbuflen, &rc, &herrno));					      \
-  } while (rc == ERANGE && herrno == NETDB_INTERNAL);			      \
+    if (rc != ERANGE || herrno != NETDB_INTERNAL)			      \
+      break;								      \
+    tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);		      \
+  }									      \
   if (status == NSS_STATUS_SUCCESS && rc == 0)				      \
     h = &th;								      \
   else									      \
@@ -585,6 +585,8 @@ gaih_inet (const char *name, const struct gaih_service *service,
 	  int no_more;
 	  nss_gethostbyname2_r fct;
 	  int old_res_options;
+	  size_t tmpbuflen = 512;
+	  char *tmpbuf = alloca (tmpbuflen);
 
 	  if (__nss_hosts_database != NULL)
 	    {
@@ -622,7 +624,10 @@ gaih_inet (const char *name, const struct gaih_service *service,
 		  if (req->ai_family == AF_INET
 		      || req->ai_family == AF_UNSPEC
 		      || (req->ai_family == AF_INET6
-			  && (req->ai_flags & AI_V4MAPPED)))
+			  && (req->ai_flags & AI_V4MAPPED)
+			  /* Avoid generating the mapped addresses if we
+			     know we are not going to need them.  */
+			  && ((req->ai_flags & AI_ALL) || !got_ipv6)))
 		    {
 		      gethosts (AF_INET, struct in_addr);