BZ#16469: don't drop trailing dot in res_nquerydomain

diff --git a/NEWS b/NEWS
index af86a93..21668c2 100644
--- a/NEWS
+++ b/NEWS
@@ -9,10 +9,10 @@  Version 2.21
 
 * The following bugs are resolved with this release:
 
-  6652, 12926, 14132, 14138, 14171, 14498, 15215, 15819, 15884, 17266,
-  17344, 17363, 17370, 17371, 17411, 17460, 17475, 17485, 17501, 17506,
-  17508, 17522, 17555, 17570, 17571, 17572, 17573, 17574, 17582, 17583,
-  17584, 17585, 17589.
+  6652, 12926, 14132, 14138, 14171, 14498, 15215, 15819, 15884, 16469,
+  17266, 17344, 17363, 17370, 17371, 17411, 17460, 17475, 17485, 17501,
+  17506, 17508, 17522, 17555, 17570, 17571, 17572, 17573, 17574, 17582,
+  17583, 17584, 17585, 17589.
 
 * New locales: tu_IN, bh_IN.
 
diff --git a/posix/Makefile b/posix/Makefile
index e6b69b4..faefaf1 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -87,7 +87,7 @@  tests		:= tstgetopt testfnm runtests runptests	     \
 		   bug-getopt1 bug-getopt2 bug-getopt3 bug-getopt4 \
 		   bug-getopt5 tst-getopt_long1 bug-regex34 bug-regex35 \
 		   tst-pathconf tst-getaddrinfo4 tst-rxspencer-no-utf8 \
-		   tst-fnmatch3 bug-regex36
+		   tst-fnmatch3 bug-regex36 tst-getaddrinfo5
 xtests		:= bug-ga2
 ifeq (yes,$(build-shared))
 test-srcs	:= globtest
diff --git a/posix/tst-getaddrinfo5.c b/posix/tst-getaddrinfo5.c
new file mode 100644
index 0000000..cfebb9b
--- /dev/null
+++ b/posix/tst-getaddrinfo5.c
@@ -0,0 +1,69 @@ 
+/* Test host lookup with double dots at the end, [BZ #16469].
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <string.h>
+
+static int
+test (void)
+{
+  static char host1[] = "localhost..";
+  static char host2[] = "www.gnu.org..";
+  static char *hosts[] = { host1, host2 };
+  int i;
+  int pass = 0;
+
+  for (i = 0; i < sizeof (hosts) / sizeof (*hosts); i++)
+    {
+      char *host = hosts[i];
+      size_t len = strlen (host);
+      struct addrinfo *ai;
+
+      /* If the name doesn't resolve with a single dot at the
+	 end, skip it.  */
+      host[len-1] = 0;
+      if (getaddrinfo (host, NULL, NULL, &ai) != 0)
+	{
+	  printf ("resolving \"%s\" failed, skipping this hostname\n", host);
+	  continue;
+	}
+      printf ("resolving \"%s\" worked, proceeding to test\n", host);
+      freeaddrinfo (ai);
+
+      /* If it resolved with a single dot, check that it doesn't with
+	 a second trailing dot.  */
+      host[len-1] = '.';
+      if (getaddrinfo (host, NULL, NULL, &ai) == 0)
+	{
+	  printf ("resolving \"%s\" worked, test failed\n", host);
+	  return 1;
+	}
+      printf ("resolving \"%s\" failed, test passed\n", host);
+      pass = 1;
+    }
+
+  /* We want at least one successful name resolution for the test to
+     succeed.  */
+  return pass ? 0 : 2;
+}
+
+#define TEST_FUNCTION test ()
+#define TIMEOUT 10
+#include "../test-skeleton.c"
diff --git a/resolv/res_query.c b/resolv/res_query.c
index e4ee2a6..338ad82 100644
--- a/resolv/res_query.c
+++ b/resolv/res_query.c
@@ -561,10 +561,6 @@  __libc_res_nquerydomain(res_state statp,
 		       name, domain?domain:"<Nil>", class, type);
 #endif
 	if (domain == NULL) {
-		/*
-		 * Check for trailing '.';
-		 * copy without '.' if present.
-		 */
 		n = strlen(name);
 
 		/* Decrement N prior to checking it against MAXDNAME
@@ -575,11 +571,7 @@  __libc_res_nquerydomain(res_state statp,
 			RES_SET_H_ERRNO(statp, NO_RECOVERY);
 			return (-1);
 		}
-		if (name[n] == '.') {
-			strncpy(nbuf, name, n);
-			nbuf[n] = '\0';
-		} else
-			longname = name;
+		longname = name;
 	} else {
 		n = strlen(name);
 		d = strlen(domain);