* nis/nss_nisplus/nisplus-service.c: Fix locking to use

	_nss_create_tablename.  Avoid unnecessary copying, remove
	unnecessary variables, general cleanup.
	* nis/nss_nisplus/nisplus-rpc.c: Likewise.
	* nis/nss_nisplus/nisplus-proto.c: Likewise..
	* nis/nss_nisplus/nisplus-network.c: Fix locking to use
	_nss_create_tablename.  Avoid unnecessary copying, general cleanup.
	* nis/nss_nisplus/nisplus-hosts.c (_nss_nisplus_getipnodebyname_r):
	Removed.
	Fix locking to use _nss_create_tablename.  Avoid unnecessary copying,
	general cleanup.
	* nis/nss_nisplus/nisplus-ethers.c (_nss_nisplus_getntohost_r):
	Correctly construct request.
	Fix locking to use _nss_create_tablename.  Avoid unnecessary copying,
	general cleanup.
	* nis/nss_nisplus/nisplus-alias.c: Fix locking to use
	_nss_create_tablename.  Avoid unnecessary copying, general cleanup.

7 files changed, 860 insertions, 728 deletions

diff --git a/nis/nss_nisplus/nisplus-alias.c b/nis/nss_nisplus/nisplus-alias.c
index 152e5fc3fc..6aa93ab3bc 100644
--- a/nis/nss_nisplus/nisplus-alias.c
+++ b/nis/nss_nisplus/nisplus-alias.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,2001,2002,2003,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
 
@@ -17,6 +17,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <atomic.h>
 #include <nss.h>
 #include <errno.h>
 #include <ctype.h>
@@ -32,7 +33,7 @@ __libc_lock_define_initialized (static, lock)
 static nis_result *result;
 static u_long next_entry;
 static nis_name tablename_val;
-static u_long tablename_len;
+static size_t tablename_len;
 
 #define NISENTRYVAL(idx,col,res) \
         ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
@@ -45,19 +46,26 @@ _nss_create_tablename (int *errnop)
 {
   if (tablename_val == NULL)
     {
-      char buf [40 + strlen (nis_local_directory ())];
-      char *p;
+      const char *local_dir = nis_local_directory ();
+      size_t local_dir_len = strlen (local_dir);
+      static const char prefix[] = "mail_aliases.org_dir.";
 
-      p = __stpcpy (buf, "mail_aliases.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == NULL)
 	{
 	  *errnop = errno;
 	  return NSS_STATUS_TRYAGAIN;
 	}
-      tablename_len = strlen (tablename_val);
+
+      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
+
+      tablename_len = sizeof (prefix) - 1 + local_dir_len;
+
+      atomic_write_barrier ();
+
+      tablename_val = p;
     }
+
   return NSS_STATUS_SUCCESS;
 }
 
@@ -75,81 +83,73 @@ _nss_nisplus_parse_aliasent (nis_result *result, unsigned long entry,
 		 "mail_aliases") != 0
       || result->objects.objects_val[entry].EN_data.en_cols.en_cols_len < 2)
     return 0;
-  else
+
+  char *first_unused = buffer + NISENTRYLEN (0, 1, result) + 1;
+  size_t room_left = (buflen - (buflen % __alignof__ (char *))
+		      - NISENTRYLEN (0, 1, result) - 2);
+
+  if (NISENTRYLEN (entry, 1, result) >= buflen)
     {
-      char *first_unused = buffer + NISENTRYLEN (0, 1, result) + 1;
-      size_t room_left =
-	buflen - (buflen % __alignof__ (char *)) -
-	NISENTRYLEN (0, 1, result) - 2;
-      char *line;
-      char *cp;
-
-      if (NISENTRYLEN (entry, 1, result) >= buflen)
-	{
-	  /* The line is too long for our buffer.  */
-	no_more_room:
-	  *errnop = ERANGE;
-	  return -1;
-	}
-      else
-	{
-	  cp = __stpncpy (buffer, NISENTRYVAL (entry, 1, result),
-			 NISENTRYLEN (entry, 1, result));
-	  *cp = '\0';
-	}
+      /* The line is too long for our buffer.  */
+    no_more_room:
+      *errnop = ERANGE;
+      return -1;
+    }
+
+  char *cp = __stpncpy (buffer, NISENTRYVAL (entry, 1, result),
+			NISENTRYLEN (entry, 1, result));
+  *cp = '\0';
+
+  if (NISENTRYLEN(entry, 0, result) >= room_left)
+    goto no_more_room;
+
+  alias->alias_local = 0;
+  alias->alias_members_len = 0;
+  *first_unused = '\0';
+  ++first_unused;
+  cp = __stpncpy (first_unused, NISENTRYVAL (entry, 0, result),
+		  NISENTRYLEN (entry, 0, result));
+  *cp = '\0';
+  alias->alias_name = first_unused;
+
+  /* Terminate the line for any case.  */
+  cp = strpbrk (alias->alias_name, "#\n");
+  if (cp != NULL)
+    *cp = '\0';
+
+  first_unused += strlen (alias->alias_name) +1;
+  /* Adjust the pointer so it is aligned for
+     storing pointers.  */
+  first_unused += __alignof__ (char *) - 1;
+  first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
+  alias->alias_members = (char **) first_unused;
+
+  char *line = buffer;
+  while (*line != '\0')
+    {
+      /* Skip leading blanks.  */
+      while (isspace (*line))
+	++line;
+
+      if (*line == '\0')
+	break;
 
-      if (NISENTRYLEN(entry, 0, result) >= room_left)
+      if (room_left < sizeof (char *))
 	goto no_more_room;
+      room_left -= sizeof (char *);
+      alias->alias_members[alias->alias_members_len] = line;
+
+      while (*line != '\0' && *line != ',')
+	++line;
 
-      alias->alias_local = 0;
-      alias->alias_members_len = 0;
-      *first_unused = '\0';
-      ++first_unused;
-      cp = __stpncpy (first_unused, NISENTRYVAL (entry, 0, result),
-		      NISENTRYLEN (entry, 0, result));
-      *cp = '\0';
-      alias->alias_name = first_unused;
-
-      /* Terminate the line for any case.  */
-      cp = strpbrk (alias->alias_name, "#\n");
-      if (cp != NULL)
-	*cp = '\0';
-
-      first_unused += strlen (alias->alias_name) +1;
-      /* Adjust the pointer so it is aligned for
-	 storing pointers.  */
-      first_unused += __alignof__ (char *) - 1;
-      first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
-      alias->alias_members = (char **) first_unused;
-
-      line = buffer;
-
-      while (*line != '\0')
+      if (line != alias->alias_members[alias->alias_members_len])
 	{
-	  /* Skip leading blanks.  */
-	  while (isspace (*line))
-	    ++line;
-
-	  if (*line == '\0')
-	    break;
-
-	  if (room_left < sizeof (char *))
-	    goto no_more_room;
-	  room_left -= sizeof (char *);
-	  alias->alias_members[alias->alias_members_len] = line;
-
-	  while (*line != '\0' && *line != ',')
-	    ++line;
-
-	  if (line != alias->alias_members[alias->alias_members_len])
-	    {
-	      *line++ = '\0';
-	      alias->alias_members_len++;
-	    }
+	  *line++ = '\0';
+	  alias->alias_members_len++;
 	}
-
-      return alias->alias_members_len == 0 ? 0 : 1;
     }
+
+  return alias->alias_members_len == 0 ? 0 : 1;
 }
 
 static enum nss_status
@@ -158,9 +158,11 @@ internal_setaliasent (void)
   enum nss_status status;
   int err;
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result !=  NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   if (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
     return NSS_STATUS_UNAVAIL;
@@ -203,9 +205,11 @@ _nss_nisplus_endaliasent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
   next_entry = 0;
 
   __libc_lock_unlock (lock);
@@ -240,7 +244,8 @@ internal_nisplus_getaliasent_r (struct aliasent *alias,
 	return NSS_STATUS_TRYAGAIN;
 
       ++next_entry;
-    } while (!parse_res);
+    }
+  while (!parse_res);
 
   return NSS_STATUS_SUCCESS;
 }
@@ -268,7 +273,12 @@ _nss_nisplus_getaliasbyname_r (const char *name, struct aliasent *alias,
 
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
+
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
@@ -278,35 +288,34 @@ _nss_nisplus_getaliasbyname_r (const char *name, struct aliasent *alias,
       *errnop = EINVAL;
       return NSS_STATUS_UNAVAIL;
     }
-  else
-    {
-      nis_result *result;
-      char buf[strlen (name) + 30 + tablename_len];
-      int olderr = errno;
 
-      sprintf (buf, "[name=%s],%s", name, tablename_val);
+  char buf[strlen (name) + 9 + tablename_len];
+  int olderr = errno;
 
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
 
-      if (result == NULL)
-	{
-	  *errnop = ENOMEM;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
-	return niserr2nss (result->status);
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      parse_res = _nss_nisplus_parse_aliasent (result, 0, alias,
-					       buffer, buflen, errnop);
-      if (parse_res < 1)
-	{
-	  __set_errno (olderr);
+  if (result == NULL)
+    {
+      *errnop = ENOMEM;
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-	  if (parse_res == -1)
-	    return NSS_STATUS_TRYAGAIN;
-	  else
-	    return NSS_STATUS_NOTFOUND;
-	}
-      return NSS_STATUS_SUCCESS;
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+    return niserr2nss (result->status);
+
+  parse_res = _nss_nisplus_parse_aliasent (result, 0, alias,
+					   buffer, buflen, errnop);
+  if (__builtin_expect (parse_res < 1, 0))
+    {
+      __set_errno (olderr);
+
+      if (parse_res == -1)
+	return NSS_STATUS_TRYAGAIN;
+      else
+	return NSS_STATUS_NOTFOUND;
     }
+
+  return NSS_STATUS_SUCCESS;
 }
diff --git a/nis/nss_nisplus/nisplus-ethers.c b/nis/nss_nisplus/nisplus-ethers.c
index 028309c841..528ae88a0c 100644
--- a/nis/nss_nisplus/nisplus-ethers.c
+++ b/nis/nss_nisplus/nisplus-ethers.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997,1998,2000,2001,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,2000-2003,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
 
@@ -17,15 +17,17 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-#include <errno.h>
+#include <atomic.h>
 #include <ctype.h>
-#include <string.h>
-#include <bits/libc-lock.h>
+#include <errno.h>
+#include <inttypes.h>
 #include <netdb.h>
+#include <nss.h>
+#include <string.h>
 #include <netinet/ether.h>
-#include <rpcsvc/nis.h>
 #include <netinet/if_ether.h>
+#include <rpcsvc/nis.h>
+#include <bits/libc-lock.h>
 
 #include "nss-nisplus.h"
 
@@ -70,7 +72,14 @@ _nss_nisplus_parse_etherent (nis_result *result, struct etherent *ether,
   room_left -= (NISENTRYLEN (0, 0, result) +1);
   ether->e_name = p;
 
-  ether->e_addr = *ether_aton (NISENTRYVAL (0, 1, result));
+  struct ether_addr *ea = ether_aton (NISENTRYVAL (0, 1, result));
+  if (ea == NULL)
+    {
+      *errnop = EINVAL;
+      return -2;
+    }
+
+  ether->e_addr = *ea;
 
   return 1;
 }
@@ -80,18 +89,24 @@ _nss_create_tablename (int *errnop)
 {
   if (tablename_val == NULL)
     {
-      char buf [40 + strlen (nis_local_directory ())];
-      char *p;
+      const char *local_dir = nis_local_directory ();
+      size_t local_dir_len = strlen (local_dir);
+      static const char prefix[] = "ethers.org_dir.";
 
-      p = __stpcpy (buf, "ethers.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == NULL)
 	{
 	  *errnop = errno;
 	  return NSS_STATUS_TRYAGAIN;
 	}
-      tablename_len = strlen (tablename_val);
+
+      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
+
+      tablename_len = sizeof (prefix) - 1 + local_dir_len;
+
+      atomic_write_barrier ();
+
+      tablename_val = p;
     }
   return NSS_STATUS_SUCCESS;
 }
@@ -107,9 +122,11 @@ _nss_nisplus_setetherent (int stayopen)
 
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   if (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
     status = NSS_STATUS_UNAVAIL;
@@ -124,9 +141,11 @@ _nss_nisplus_endetherent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   __libc_lock_unlock (lock);
 
@@ -178,7 +197,6 @@ internal_nisplus_getetherent_r (struct etherent *ether, char *buffer,
       if (parse_res == -1)
 	{
 	  nis_freeresult (result);
-	  *errnop = ERANGE;
 	  result = saved_result;
 	  return NSS_STATUS_TRYAGAIN;
 	}
@@ -258,7 +276,6 @@ _nss_nisplus_gethostton_r (const char *name, struct etherent *eth,
 	  if (parse_res == -1)
 	    {
 	      nis_freeresult (result);
-	      *errnop = ERANGE;
 	      return NSS_STATUS_TRYAGAIN;
 	    }
 	  else
@@ -275,8 +292,12 @@ _nss_nisplus_getntohost_r (const struct ether_addr *addr,
 {
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
@@ -286,44 +307,45 @@ _nss_nisplus_getntohost_r (const struct ether_addr *addr,
       *errnop = EINVAL;
       return NSS_STATUS_UNAVAIL;
     }
-  else
-    {
-      int parse_res;
-      nis_result *result;
-      char buf[255 + tablename_len];
 
-      sprintf (buf, "[addr=%x:%x:%x:%x:%x:%x],ethers.org_dir",
-	       addr->ether_addr_octet[0], addr->ether_addr_octet[1],
-	       addr->ether_addr_octet[2], addr->ether_addr_octet[3],
-	       addr->ether_addr_octet[4], addr->ether_addr_octet[5]);
+  int parse_res;
+  char buf[26 + tablename_len];
 
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+  snprintf (buf, sizeof (buf),
+	    "[addr=%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8
+	    ":%" PRIx8 "],%s",
+	    addr->ether_addr_octet[0], addr->ether_addr_octet[1],
+	    addr->ether_addr_octet[2], addr->ether_addr_octet[3],
+	    addr->ether_addr_octet[4], addr->ether_addr_octet[5],
+	    tablename_val);
 
-      if (result == NULL)
-	{
-	  *errnop = ENOMEM;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+
+  if (result == NULL)
+    {
+      *errnop = ENOMEM;
+      return NSS_STATUS_TRYAGAIN;
+    }
+
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+    {
+      enum nss_status status = niserr2nss (result->status);
+      nis_freeresult (result);
+      return status;
+    }
+
+  parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
+					   buflen, errnop);
+  if (__builtin_expect (parse_res < 1, 0))
+    {
+      if (parse_res == -1)
 	{
-	  enum nss_status status = niserr2nss (result->status);
 	  nis_freeresult (result);
-	  return status;
+	  return NSS_STATUS_TRYAGAIN;
 	}
 
-      parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
-					       buflen, errnop);
-      if (parse_res < 1)
-	{
-	  if (parse_res == -1)
-	    {
-	      nis_freeresult (result);
-	      *errnop = ERANGE;
-	      return NSS_STATUS_TRYAGAIN;
-	    }
-	  else
-	    return NSS_STATUS_NOTFOUND;
-	}
-      return NSS_STATUS_SUCCESS;
+      return NSS_STATUS_NOTFOUND;
     }
+
+  return NSS_STATUS_SUCCESS;
 }
diff --git a/nis/nss_nisplus/nisplus-hosts.c b/nis/nss_nisplus/nisplus-hosts.c
index 540469894e..81f8a984dc 100644
--- a/nis/nss_nisplus/nisplus-hosts.c
+++ b/nis/nss_nisplus/nisplus-hosts.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997-2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2002, 2003, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
 
@@ -17,15 +17,16 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-#include <netdb.h>
-#include <errno.h>
+#include <atomic.h>
 #include <ctype.h>
+#include <errno.h>
+#include <netdb.h>
+#include <nss.h>
 #include <string.h>
-#include <netinet/in.h>
 #include <arpa/inet.h>
-#include <bits/libc-lock.h>
+#include <netinet/in.h>
 #include <rpcsvc/nis.h>
+#include <bits/libc-lock.h>
 
 #include "nss-nisplus.h"
 
@@ -180,19 +181,26 @@ _nss_create_tablename (int *errnop)
 {
   if (tablename_val == NULL)
     {
-      char buf [40 + strlen (nis_local_directory ())];
-      char *p;
+      const char *local_dir = nis_local_directory ();
+      size_t local_dir_len = strlen (local_dir);
+      static const char prefix[] = "hosts.org_dir.";
 
-      p = __stpcpy (buf, "hosts.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == NULL)
 	{
 	  *errnop = errno;
 	  return NSS_STATUS_TRYAGAIN;
 	}
-      tablename_len = strlen (tablename_val);
+
+      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
+
+      tablename_len = sizeof (prefix) - 1 + local_dir_len;
+
+      atomic_write_barrier ();
+
+      tablename_val = p;
     }
+
   return NSS_STATUS_SUCCESS;
 }
 
@@ -204,9 +212,11 @@ _nss_nisplus_sethostent (int stayopen)
 
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   if (tablename_val == NULL)
     status = _nss_create_tablename (&err);
@@ -221,9 +231,11 @@ _nss_nisplus_endhostent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   __libc_lock_unlock (lock);
 
@@ -335,8 +347,12 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
 
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	{
 	  *herrnop = NETDB_INTERNAL;
@@ -350,75 +366,81 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
       *herrnop = NETDB_INTERNAL;
       return NSS_STATUS_NOTFOUND;
     }
-  else
-    {
-      nis_result *result;
-      char buf[strlen (name) + 255 + tablename_len];
-      int olderr = errno;
 
-      /* Search at first in the alias list, and use the correct name
-	 for the next search */
-      sprintf (buf, "[name=%s],%s", name, tablename_val);
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+  nis_result *result;
+  char buf[strlen (name) + 10 + tablename_len];
+  int olderr = errno;
 
-      if (result != NULL)
-	{
-	  /* If we do not find it, try it as original name. But if the
-	     database is correct, we should find it in the first case, too */
-	  if ((result->status != NIS_SUCCESS
-	       && result->status != NIS_S_SUCCESS)
-	      || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
-	      || strcmp (result->objects.objects_val->EN_data.en_type,
-			 "hosts_tbl") != 0
-	      || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
-	    sprintf (buf, "[cname=%s],%s", name, tablename_val);
-	  else
-	    sprintf (buf, "[cname=%s],%s", NISENTRYVAL(0, 0, result),
-		     tablename_val);
-
-	  nis_freeresult (result);
-	  result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
-	}
+  /* Search at first in the alias list, and use the correct name
+     for the next search.  */
+  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
+  result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      if (result == NULL)
+  if (result != NULL)
+    {
+      char *bufptr = buf;
+
+      /* If we did not find it, try it as original name. But if the
+	 database is correct, we should find it in the first case, too.  */
+      if ((result->status != NIS_SUCCESS
+	   && result->status != NIS_S_SUCCESS)
+	  || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
+	  || strcmp (result->objects.objects_val->EN_data.en_type,
+		     "hosts_tbl") != 0
+	  || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
+	snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
+      else
 	{
-	  *errnop = ENOMEM;
-	  return NSS_STATUS_TRYAGAIN;
+	  /* We need to allocate a new buffer since there is no
+	     guarantee the returned name has a length limit.  */
+	  const char *entryval = NISENTRYVAL(0, 0, result);
+	  size_t buflen = strlen (entryval) + 10 + tablename_len;
+	  bufptr = alloca (buflen);
+	  snprintf (bufptr, buflen, "[cname=%s],%s",
+		    entryval, tablename_val);
 	}
-      retval = niserr2nss (result->status);
-      if (retval != NSS_STATUS_SUCCESS)
-        {
-          if (retval == NSS_STATUS_TRYAGAIN)
-            {
-	      *errnop = errno;
-              *herrnop = NETDB_INTERNAL;
-            }
-	  else
-	    __set_errno (olderr);
-	  nis_freeresult (result);
-          return retval;
-        }
-
-      parse_res = _nss_nisplus_parse_hostent (result, af, host, buffer,
-					      buflen, errnop, flags);
 
       nis_freeresult (result);
+      result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+    }
 
-      if (parse_res > 0)
-	return NSS_STATUS_SUCCESS;
+  if (result == NULL)
+    {
+      *errnop = ENOMEM;
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-      *herrnop = NETDB_INTERNAL;
-      if (parse_res == -1)
+  retval = niserr2nss (result->status);
+  if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
+    {
+      if (retval == NSS_STATUS_TRYAGAIN)
 	{
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
+	  *errnop = errno;
+	  *herrnop = NETDB_INTERNAL;
 	}
       else
-	{
-	  __set_errno (olderr);
-	  return NSS_STATUS_NOTFOUND;
-	}
+	__set_errno (olderr);
+      nis_freeresult (result);
+      return retval;
     }
+
+  parse_res = _nss_nisplus_parse_hostent (result, af, host, buffer,
+					  buflen, errnop, flags);
+
+  nis_freeresult (result);
+
+  if (parse_res > 0)
+    return NSS_STATUS_SUCCESS;
+
+  *herrnop = NETDB_INTERNAL;
+  if (parse_res == -1)
+    {
+      *errnop = ERANGE;
+      return NSS_STATUS_TRYAGAIN;
+    }
+
+  __set_errno (olderr);
+  return NSS_STATUS_NOTFOUND;
 }
 
 enum nss_status
@@ -431,17 +453,6 @@ _nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host,
 			 ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
 }
 
-#if 0
-enum nss_status
-_nss_nisplus_getipnodebyname_r (const char *name, int af, int flags,
-				struct hostent *result, char *buffer,
-				size_t buflen, int *errnop, int *herrnop)
-{
-  return internal_gethostbyname2_r (name, af, result, buffer, buflen,
-				    errnop, herrnop, flags);
-}
-#endif
-
 enum nss_status
 _nss_nisplus_gethostbyname_r (const char *name, struct hostent *host,
 			      char *buffer, size_t buflen, int *errnop,
@@ -469,62 +480,63 @@ _nss_nisplus_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
 {
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
 
   if (addr == NULL)
     return NSS_STATUS_NOTFOUND;
-  else
-    {
-      nis_result *result;
-      char buf[255 + tablename_len];
-      int retval, parse_res;
-      int olderr = errno;
 
-      sprintf (buf, "[addr=%s],%s",
-	       inet_ntoa (*(const struct in_addr *) addr), tablename_val);
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
-
-      if (result == NULL)
-	{
-	  __set_errno (ENOMEM);
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      retval = niserr2nss (result->status);
-      if (retval != NSS_STATUS_SUCCESS)
-        {
-          if (retval == NSS_STATUS_TRYAGAIN)
-            {
-	      *errnop = errno;
-              *herrnop = NETDB_INTERNAL;
-            }
-	  else
-	    __set_errno (olderr);
-	  nis_freeresult (result);
-          return retval;
-        }
+  char buf[24 + tablename_len];
+  int retval, parse_res;
+  int olderr = errno;
 
-      parse_res = _nss_nisplus_parse_hostent (result, af, host,
-					      buffer, buflen, errnop,
-		     ((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
-      nis_freeresult (result);
+  snprintf (buf, sizeof (buf), "[addr=%s],%s",
+	   inet_ntoa (*(const struct in_addr *) addr), tablename_val);
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      if (parse_res > 0)
-	return NSS_STATUS_SUCCESS;
+  if (result == NULL)
+    {
+      __set_errno (ENOMEM);
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-      *herrnop = NETDB_INTERNAL;
-      if (parse_res == -1)
+  retval = niserr2nss (result->status);
+  if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
+    {
+      if (retval == NSS_STATUS_TRYAGAIN)
 	{
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
+	  *errnop = errno;
+	  *herrnop = NETDB_INTERNAL;
 	}
       else
-	{
-	  __set_errno (olderr);
-	  return NSS_STATUS_NOTFOUND;
-	}
+	__set_errno (olderr);
+      nis_freeresult (result);
+      return retval;
+    }
+
+  parse_res = _nss_nisplus_parse_hostent (result, af, host,
+					  buffer, buflen, errnop,
+					  ((_res.options & RES_USE_INET6)
+					   ? AI_V4MAPPED : 0));
+  nis_freeresult (result);
+
+  if (parse_res > 0)
+    return NSS_STATUS_SUCCESS;
+
+  *herrnop = NETDB_INTERNAL;
+  if (parse_res == -1)
+    {
+      *errnop = ERANGE;
+      return NSS_STATUS_TRYAGAIN;
     }
+
+  __set_errno (olderr);
+  return NSS_STATUS_NOTFOUND;
 }
diff --git a/nis/nss_nisplus/nisplus-network.c b/nis/nss_nisplus/nisplus-network.c
index 422b02b82a..1cd7cf2588 100644
--- a/nis/nss_nisplus/nisplus-network.c
+++ b/nis/nss_nisplus/nisplus-network.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997,1998,2000,2001,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,2000-2003,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
 
@@ -17,15 +17,16 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-#include <netdb.h>
-#include <errno.h>
+#include <atomic.h>
 #include <ctype.h>
+#include <errno.h>
+#include <netdb.h>
+#include <nss.h>
 #include <stdint.h>
 #include <string.h>
 #include <arpa/inet.h>
-#include <bits/libc-lock.h>
 #include <rpcsvc/nis.h>
+#include <bits/libc-lock.h>
 
 #include "nss-nisplus.h"
 
@@ -44,12 +45,10 @@ static u_long tablename_len;
 
 static int
 _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
-			    char *buffer, size_t buflen, int *errnop)
+			   char *buffer, size_t buflen, int *errnop)
 {
   char *first_unused = buffer;
   size_t room_left = buflen;
-  unsigned int i;
-  char *p, *line;
 
   if (result == NULL)
     return 0;
@@ -61,7 +60,7 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
       || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
     return 0;
 
-  if (NISENTRYLEN(0, 0, result) >= room_left)
+  if (NISENTRYLEN (0, 0, result) >= room_left)
     {
       /* The line is too long for our buffer.  */
     no_more_room:
@@ -69,7 +68,7 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
       return -1;
     }
 
-  strncpy (first_unused, NISENTRYVAL(0, 0, result),
+  strncpy (first_unused, NISENTRYVAL (0, 0, result),
            NISENTRYLEN (0, 0, result));
   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
   network->n_name = first_unused;
@@ -77,10 +76,10 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
   first_unused += strlen (first_unused) +1;
   network->n_addrtype = 0;
   network->n_net = inet_network (NISENTRYVAL (0, 2, result));
-  p = first_unused;
+  char *p = first_unused;
 
-  line = p;
-  for (i = 0; i < result->objects.objects_len; ++i)
+  char *line = p;
+  for (unsigned int i = 0; i < result->objects.objects_len; ++i)
     {
       if (strcmp (NISENTRYVAL (i, 1, result), network->n_name) != 0)
         {
@@ -107,12 +106,12 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
   room_left -= (2 * sizeof (char *));
   network->n_aliases[0] = NULL;
 
-  i = 0;
+  unsigned int i = 0;
   while (*line != '\0')
     {
       /* Skip leading blanks.  */
       while (isspace (*line))
-        line++;
+        ++line;
 
       if (*line == '\0')
         break;
@@ -133,7 +132,7 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
           ++i;
         }
       else
-        network->n_aliases[i+1] = NULL;
+        network->n_aliases[i + 1] = NULL;
     }
 
   return 1;
@@ -144,19 +143,26 @@ _nss_create_tablename (int *errnop)
 {
   if (tablename_val == NULL)
     {
-      char buf [40 + strlen (nis_local_directory ())];
-      char *p;
+      const char *local_dir = nis_local_directory ();
+      size_t local_dir_len = strlen (local_dir);
+      static const char prefix[] = "networks.org_dir.";
 
-      p = __stpcpy (buf, "networks.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == NULL)
 	{
 	  *errnop = errno;
 	  return NSS_STATUS_TRYAGAIN;
 	}
-      tablename_len = strlen (tablename_val);
+
+      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
+
+      tablename_len = sizeof (prefix) - 1 + local_dir_len;
+
+      atomic_write_barrier ();
+
+      tablename_val = p;
     }
+
   return NSS_STATUS_SUCCESS;
 }
 
@@ -164,16 +170,20 @@ enum nss_status
 _nss_nisplus_setnetent (int stayopen)
 {
   enum nss_status status = NSS_STATUS_SUCCESS;
-  int err;
 
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   if (tablename_val == NULL)
-    status = _nss_create_tablename (&err);
+    {
+      int err;
+      status = _nss_create_tablename (&err);
+    }
 
   __libc_lock_unlock (lock);
 
@@ -185,9 +195,11 @@ _nss_nisplus_endnetent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   __libc_lock_unlock (lock);
 
@@ -220,9 +232,7 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 	  result = nis_first_entry (tablename_val);
 	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 	    {
-	      int retval;
-
-	      retval = niserr2nss (result->status);
+	      int retval = niserr2nss (result->status);
 	      nis_freeresult (result);
 	      result = NULL;
 	      if (retval == NSS_STATUS_TRYAGAIN)
@@ -237,16 +247,12 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 	}
       else
 	{
-	  nis_result *res;
-
-	  res = nis_next_entry (tablename_val, &result->cookie);
+	  nis_result *res = nis_next_entry (tablename_val, &result->cookie);
 	  saved_res = result;
 	  result = res;
 	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 	    {
-	      int retval;
-
-	      retval = niserr2nss (result->status);
+	      int retval = niserr2nss (result->status);
 	      nis_freeresult (result);
 	      result = saved_res;
 	      if (retval == NSS_STATUS_TRYAGAIN)
@@ -266,7 +272,8 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
           return NSS_STATUS_TRYAGAIN;
         }
 
-    } while (!parse_res);
+    }
+  while (!parse_res);
 
   return NSS_STATUS_SUCCESS;
 }
@@ -296,8 +303,12 @@ _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
 
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
@@ -308,76 +319,82 @@ _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
       *herrnop = NETDB_INTERNAL;
       return NSS_STATUS_UNAVAIL;
     }
-  else
-    {
-      nis_result *result;
-      char buf[strlen (name) + 255 + tablename_len];
-      int olderr = errno;
 
-      /* Search at first in the alias list, and use the correct name
-	 for the next search */
-      sprintf (buf, "[name=%s],%s", name, tablename_val);
-      result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+  nis_result *result;
+  char buf[strlen (name) + 10 + tablename_len];
+  int olderr = errno;
 
-      if (result != NULL)
-	{
-	  /* If we do not find it, try it as original name. But if the
-	     database is correct, we should find it in the first case, too */
-	  if ((result->status != NIS_SUCCESS
-	       && result->status != NIS_S_SUCCESS)
-	      || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
-	      || strcmp (result->objects.objects_val[0].EN_data.en_type,
-			 "networks_tbl") != 0
-	      || (result->objects.objects_val[0].EN_data.en_cols.en_cols_len
-		  < 3))
-	    sprintf (buf, "[cname=%s],%s", name, tablename_val);
-	  else
-	    sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
-		     tablename_val);
-
-	  nis_freeresult (result);
-	  result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
-	}
+  /* Search at first in the alias list, and use the correct name
+     for the next search */
+  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
+  result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 
-      if (result == NULL)
-	{
-	  __set_errno (ENOMEM);
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      retval = niserr2nss (result->status);
-      if (retval != NSS_STATUS_SUCCESS)
+  if (result != NULL)
+    {
+      char *bufptr = buf;
+
+      /* If we do not find it, try it as original name. But if the
+	 database is correct, we should find it in the first case, too */
+      if ((result->status != NIS_SUCCESS
+	   && result->status != NIS_S_SUCCESS)
+	  || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
+	  || strcmp (result->objects.objects_val[0].EN_data.en_type,
+		     "networks_tbl") != 0
+	  || (result->objects.objects_val[0].EN_data.en_cols.en_cols_len
+	      < 3))
+	snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
+      else
 	{
-	  if (retval == NSS_STATUS_TRYAGAIN)
-	    {
-	      *errnop = errno;
-	      *herrnop = NETDB_INTERNAL;
-	    }
-	  else
-	    __set_errno (olderr);
-	  nis_freeresult (result);
-	  return retval;
+	  /* We need to allocate a new buffer since there is no
+	     guarantee the returned name has a length limit.  */
+	  const char *entryval = NISENTRYVAL (0, 0, result);
+	  size_t buflen = strlen (entryval) + 10 + tablename_len;
+	  bufptr = alloca (buflen);
+	  snprintf (bufptr, buflen, "[cname=%s],%s",
+		    entryval, tablename_val);
 	}
 
-      parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
-					     errnop);
-
       nis_freeresult (result);
+      result = nis_list (bufptr, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+    }
 
-      if (parse_res > 0)
-	return NSS_STATUS_SUCCESS;
+  if (result == NULL)
+    {
+      __set_errno (ENOMEM);
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-      *herrnop = NETDB_INTERNAL;
-      if (parse_res == -1)
+  retval = niserr2nss (result->status);
+  if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
+    {
+      if (retval == NSS_STATUS_TRYAGAIN)
 	{
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
+	  *errnop = errno;
+	  *herrnop = NETDB_INTERNAL;
 	}
       else
-	{
-	  __set_errno (olderr);
-	  return NSS_STATUS_NOTFOUND;
-	}
+	__set_errno (olderr);
+      nis_freeresult (result);
+      return retval;
     }
+
+  parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
+					 errnop);
+
+  nis_freeresult (result);
+
+  if (parse_res > 0)
+    return NSS_STATUS_SUCCESS;
+
+  *herrnop = NETDB_INTERNAL;
+  if (parse_res == -1)
+    {
+      *errnop = ERANGE;
+      return NSS_STATUS_TRYAGAIN;
+    }
+
+  __set_errno (olderr);
+  return NSS_STATUS_NOTFOUND;
 }
 
 /* XXX type is ignored, SUN's NIS+ table doesn't support it */
@@ -388,8 +405,12 @@ _nss_nisplus_getnetbyaddr_r (uint32_t addr, const int type,
 {
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
diff --git a/nis/nss_nisplus/nisplus-proto.c b/nis/nss_nisplus/nisplus-proto.c
index 83456cae64..585a4844ad 100644
--- a/nis/nss_nisplus/nisplus-proto.c
+++ b/nis/nss_nisplus/nisplus-proto.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,2001,2002,2003,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
 
@@ -17,13 +17,14 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-#include <errno.h>
+#include <atomic.h>
 #include <ctype.h>
+#include <errno.h>
 #include <netdb.h>
+#include <nss.h>
 #include <string.h>
-#include <bits/libc-lock.h>
 #include <rpcsvc/nis.h>
+#include <bits/libc-lock.h>
 
 #include "nss-nisplus.h"
 
@@ -141,19 +142,26 @@ _nss_create_tablename (int *errnop)
 {
   if (tablename_val == NULL)
     {
-      char buf [40 + strlen (nis_local_directory ())];
-      char *p;
+      const char *local_dir = nis_local_directory ();
+      size_t local_dir_len = strlen (local_dir);
+      static const char prefix[] = "protocols.org_dir.";
 
-      p = __stpcpy (buf, "protocols.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == NULL)
 	{
 	  *errnop = errno;
 	  return NSS_STATUS_TRYAGAIN;
 	}
-      tablename_len = strlen (tablename_val);
+
+      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
+
+      tablename_len = sizeof (prefix) - 1 + local_dir_len;
+
+      atomic_write_barrier ();
+
+      tablename_val = p;
     }
+
   return NSS_STATUS_SUCCESS;
 }
 
@@ -164,9 +172,11 @@ _nss_nisplus_setprotoent (int stayopen)
 
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   if (tablename_val == NULL)
     {
@@ -184,9 +194,11 @@ _nss_nisplus_endprotoent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   __libc_lock_unlock (lock);
 
@@ -221,11 +233,8 @@ internal_nisplus_getprotoent_r (struct protoent *proto, char *buffer,
 	}
       else
 	{
-	  nis_result *res;
-
 	  saved_res = result;
-	  res = nis_next_entry (tablename_val, &result->cookie);
-	  result = res;
+	  result = nis_next_entry (tablename_val, &result->cookie);
 
 	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 	    {
@@ -277,79 +286,91 @@ _nss_nisplus_getprotobyname_r (const char *name, struct protoent *proto,
 
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
 
   if (name == NULL)
     return NSS_STATUS_NOTFOUND;
-  else
-    {
-      nis_result *result;
-      char buf[strlen (name) + 255 + tablename_len];
-      int olderr = errno;
-
-      /* Search at first in the alias list, and use the correct name
-         for the next search */
-      sprintf (buf, "[name=%s],%s", name, tablename_val);
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      if (result != NULL)
-	{
-	  /* If we do not find it, try it as original name. But if the
-	     database is correct, we should find it in the first case, too */
-	  if ((result->status != NIS_SUCCESS
-	       && result->status != NIS_S_SUCCESS)
-	      || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
-	      || strcmp (result->objects.objects_val->EN_data.en_type,
-			 "protocols_tbl") != 0
-	      || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
-	    sprintf (buf, "[cname=%s],%s", name, tablename_val);
-	  else
-	    sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
-		     tablename_val);
+  char buf[strlen (name) + 10 + tablename_len];
+  int olderr = errno;
 
-	  nis_freeresult (result);
-	  result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
-	}
+  /* Search at first in the alias list, and use the correct name
+     for the next search */
+  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      if (result == NULL)
+  if (result != NULL)
+    {
+      char *bufptr = buf;
+
+      /* If we did not find it, try it as original name. But if the
+	 database is correct, we should find it in the first case, too */
+      if ((result->status != NIS_SUCCESS
+	   && result->status != NIS_S_SUCCESS)
+	  || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
+	  || strcmp (result->objects.objects_val->EN_data.en_type,
+			 "protocols_tbl") != 0
+	  || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
+	snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
+      else
 	{
-	  __set_errno (ENOMEM);
-	  return NSS_STATUS_TRYAGAIN;
+	  /* We need to allocate a new buffer since there is no
+	     guarantee the returned name has a length limit.  */
+	  const char *entryval = NISENTRYVAL (0, 0, result);
+	  size_t buflen = strlen (entryval) + 10 + tablename_len;
+	  bufptr = alloca (buflen);
+	  snprintf (bufptr, buflen, "[cname=%s],%s",
+		    entryval, tablename_val);
 	}
-      if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
-	{
-	  enum nss_status status = niserr2nss (result->status);
 
-	  __set_errno (olderr);
+      nis_freeresult (result);
+      result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+    }
 
-	  nis_freeresult (result);
-	  return status;
-	}
+  if (result == NULL)
+    {
+      __set_errno (ENOMEM);
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-      parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
-					       errnop);
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+    {
+      enum nss_status status = niserr2nss (result->status);
+
+      __set_errno (olderr);
 
       nis_freeresult (result);
+      return status;
+    }
 
-      if (parse_res < 1)
+  parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
+					   errnop);
+
+  nis_freeresult (result);
+
+  if (parse_res < 1)
+    {
+      if (parse_res == -1)
 	{
-	  if (parse_res == -1)
-	    {
-	      *errnop = ERANGE;
-	      return NSS_STATUS_TRYAGAIN;
-	    }
-	  else
-	    {
-	      __set_errno (olderr);
-	      return NSS_STATUS_NOTFOUND;
-	    }
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+      else
+	{
+	  __set_errno (olderr);
+	  return NSS_STATUS_NOTFOUND;
 	}
-      return NSS_STATUS_SUCCESS;
     }
+
+  return NSS_STATUS_SUCCESS;
 }
 
 enum nss_status
@@ -358,55 +379,57 @@ _nss_nisplus_getprotobynumber_r (const int number, struct protoent *proto,
 {
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
 
-  {
-    int parse_res;
-    nis_result *result;
-    char buf[46 + tablename_len];
-    int olderr = errno;
+  char buf[12 + 3 * sizeof (number) + tablename_len];
+  int olderr = errno;
 
-    sprintf (buf, "[number=%d],%s", number, tablename_val);
+  snprintf (buf, sizeof (buf), "[number=%d],%s", number, tablename_val);
 
-    result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+  nis_result *result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 
-    if (result == NULL)
-      {
-	__set_errno (ENOMEM);
-	return NSS_STATUS_TRYAGAIN;
-      }
-    if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
-      {
-	enum nss_status status = niserr2nss (result->status);
+  if (result == NULL)
+    {
+      __set_errno (ENOMEM);
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-	__set_errno (olderr);
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+    {
+      enum nss_status status = niserr2nss (result->status);
 
-	nis_freeresult (result);
-	return status;
-      }
-
-    parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
-					     errnop);
-
-    nis_freeresult (result);
-
-    if (parse_res < 1)
-      {
-	if (parse_res == -1)
-	  {
-	    *errnop = ERANGE;
-	    return NSS_STATUS_TRYAGAIN;
-	  }
-	else
-	  {
-	    __set_errno (olderr);
-	    return NSS_STATUS_NOTFOUND;
-	  }
-      }
-    return NSS_STATUS_SUCCESS;
-  }
+      __set_errno (olderr);
+
+      nis_freeresult (result);
+      return status;
+    }
+
+  int parse_res = _nss_nisplus_parse_protoent (result, proto, buffer, buflen,
+					       errnop);
+
+  nis_freeresult (result);
+
+  if (parse_res < 1)
+    {
+      if (parse_res == -1)
+	{
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+      else
+	{
+	  __set_errno (olderr);
+	  return NSS_STATUS_NOTFOUND;
+	}
+    }
+
+  return NSS_STATUS_SUCCESS;
 }
diff --git a/nis/nss_nisplus/nisplus-rpc.c b/nis/nss_nisplus/nisplus-rpc.c
index 31d48d17a3..98baa5f7fc 100644
--- a/nis/nss_nisplus/nisplus-rpc.c
+++ b/nis/nss_nisplus/nisplus-rpc.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,2001,2002,2003,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
 
@@ -17,13 +17,14 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-#include <errno.h>
+#include <atomic.h>
 #include <ctype.h>
+#include <errno.h>
+#include <nss.h>
 #include <string.h>
-#include <bits/libc-lock.h>
 #include <rpc/netdb.h>
 #include <rpcsvc/nis.h>
+#include <bits/libc-lock.h>
 
 #include "nss-nisplus.h"
 
@@ -138,19 +139,26 @@ _nss_create_tablename (int *errnop)
 {
   if (tablename_val == NULL)
     {
-      char buf [40 + strlen (nis_local_directory ())];
-      char *p;
+      const char *local_dir = nis_local_directory ();
+      size_t local_dir_len = strlen (local_dir);
+      static const char prefix[] = "rpc.org_dir.";
 
-      p = __stpcpy (buf, "rpc.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == NULL)
 	{
 	  *errnop = errno;
 	  return NSS_STATUS_TRYAGAIN;
 	}
-      tablename_len = strlen (tablename_val);
+
+      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
+
+      tablename_len = sizeof (prefix) - 1 + local_dir_len;
+
+      atomic_write_barrier ();
+
+      tablename_val = p;
     }
+
   return NSS_STATUS_SUCCESS;
 }
 
@@ -159,16 +167,20 @@ enum nss_status
 _nss_nisplus_setrpcent (int stayopen)
 {
   enum nss_status status = NSS_STATUS_SUCCESS;
-  int err;
 
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   if (tablename_val == NULL)
-    status = _nss_create_tablename (&err);
+    {
+      int err;
+      status = _nss_create_tablename (&err);
+    }
 
   __libc_lock_unlock (lock);
 
@@ -180,9 +192,11 @@ _nss_nisplus_endrpcent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   __libc_lock_unlock (lock);
 
@@ -217,11 +231,8 @@ internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer,
 	}
       else
 	{
-	  nis_result *res;
-
 	  saved_res = result;
-	  res = nis_next_entry (tablename_val, &result->cookie);
-	  result = res;
+	  result = nis_next_entry (tablename_val, &result->cookie);
 	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 	    {
 	      nis_freeresult (saved_res);
@@ -243,7 +254,8 @@ internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer,
 	  if (saved_res)
 	    nis_freeresult (saved_res);
 	}
-    } while (!parse_res);
+    }
+  while (!parse_res);
 
   return NSS_STATUS_SUCCESS;
 }
@@ -271,77 +283,89 @@ _nss_nisplus_getrpcbyname_r (const char *name, struct rpcent *rpc,
 
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
 
   if (name == NULL)
     return NSS_STATUS_NOTFOUND;
-  else
-    {
-      nis_result *result;
-      char buf[strlen (name) + 255 + tablename_len];
-      int olderr = errno;
-
-      /* Search at first in the alias list, and use the correct name
-         for the next search */
-      sprintf (buf, "[name=%s],%s", name, tablename_val);
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      if (result != NULL)
-	{
-	  /* If we do not find it, try it as original name. But if the
-	     database is correct, we should find it in the first case, too */
-	  if ((result->status != NIS_SUCCESS
-	       && result->status != NIS_S_SUCCESS)
-	      || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
-	      || strcmp (result->objects.objects_val->EN_data.en_type,
-			 "rpc_tbl") != 0
-	      || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
-	    sprintf (buf, "[cname=%s],%s", name, tablename_val);
-	  else
-	    sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
-		     tablename_val);
+  char buf[strlen (name) + 10 + tablename_len];
+  int olderr = errno;
 
-	  nis_freeresult (result);
-	  result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS , NULL, NULL);
-	}
+  /* Search at first in the alias list, and use the correct name
+     for the next search */
+  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      if (result == NULL)
+  if (result != NULL)
+    {
+      char *bufptr = buf;
+
+      /* If we did not find it, try it as original name. But if the
+	 database is correct, we should find it in the first case, too */
+      if ((result->status != NIS_SUCCESS
+	   && result->status != NIS_S_SUCCESS)
+	  || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
+	  || strcmp (result->objects.objects_val->EN_data.en_type,
+		     "rpc_tbl") != 0
+	  || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
+	snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
+      else
 	{
-	  *errnop = ENOMEM;
-	  return NSS_STATUS_TRYAGAIN;
+	  /* We need to allocate a new buffer since there is no
+	     guarantee the returned name has a length limit.  */
+	  const char *entryval = NISENTRYVAL (0, 0, result);
+	  size_t buflen = strlen (entryval) + 10 + tablename_len;
+	  bufptr = alloca (buflen);
+	  snprintf (bufptr, buflen, "[cname=%s],%s",
+		    entryval, tablename_val);
 	}
-      if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
-	{
-	  enum nss_status status = niserr2nss (result->status);
 
-	  __set_errno (olderr);
+      nis_freeresult (result);
+      result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS , NULL, NULL);
+    }
 
-	  nis_freeresult (result);
-	  return status;
-	}
+  if (result == NULL)
+    {
+      *errnop = ENOMEM;
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-      parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
-					     errnop);
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+    {
+      enum nss_status status = niserr2nss (result->status);
+
+      __set_errno (olderr);
 
       nis_freeresult (result);
+      return status;
+    }
 
-      if (parse_res < 1)
-	{
-	  if (parse_res == -1)
-	    {
-	      *errnop = ERANGE;
-	      return NSS_STATUS_TRYAGAIN;
-	    }
+  parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
+					     errnop);
 
-	  __set_errno (olderr);
-	  return NSS_STATUS_NOTFOUND;
+  nis_freeresult (result);
+
+  if (parse_res < 1)
+    {
+      if (parse_res == -1)
+	{
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
 	}
-      return NSS_STATUS_SUCCESS;
+
+      __set_errno (olderr);
+      return NSS_STATUS_NOTFOUND;
     }
+
+  return NSS_STATUS_SUCCESS;
 }
 
 enum nss_status
@@ -350,55 +374,57 @@ _nss_nisplus_getrpcbynumber_r (const int number, struct rpcent *rpc,
 {
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
 
-  {
-    int parse_res;
-    nis_result *result;
-    char buf[100 + tablename_len];
-    int olderr = errno;
+  char buf[12 + 3 * sizeof (number) + tablename_len];
+  int olderr = errno;
+
+  snprintf (buf, sizeof (buf), "[number=%d],%s", number, tablename_val);
+
+  nis_result *result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+
+  if (result == NULL)
+    {
+      *errnop = ENOMEM;
+      return NSS_STATUS_TRYAGAIN;
+    }
+
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS,  0))
+    {
+      enum nss_status status = niserr2nss (result->status);
 
-    sprintf (buf, "[number=%d],%s", number, tablename_val);
+      __set_errno (olderr);
 
-    result = nis_list(buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+      nis_freeresult (result);
+      return status;
+    }
 
-    if (result == NULL)
-      {
-	*errnop = ENOMEM;
-	return NSS_STATUS_TRYAGAIN;
-      }
-    if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
-      {
-	enum nss_status status = niserr2nss (result->status);
+  int parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
+					     errnop);
 
-	__set_errno (olderr);
+  nis_freeresult (result);
 
-	nis_freeresult (result);
-	return status;
-      }
-
-    parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
-					   errnop);
-
-    nis_freeresult (result);
-
-    if (parse_res < 1)
-      {
-	if (parse_res == -1)
-	  {
-	    *errnop = ERANGE;
-	    return NSS_STATUS_TRYAGAIN;
-	  }
-	else
-	  {
-	    __set_errno (olderr);
-	    return NSS_STATUS_NOTFOUND;
-	  }
-      }
-    return NSS_STATUS_SUCCESS;
-  }
+  if (parse_res < 1)
+    {
+      if (parse_res == -1)
+	{
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+      else
+	{
+	  __set_errno (olderr);
+	  return NSS_STATUS_NOTFOUND;
+	}
+    }
+
+  return NSS_STATUS_SUCCESS;
 }
diff --git a/nis/nss_nisplus/nisplus-service.c b/nis/nss_nisplus/nisplus-service.c
index fbb6987e9e..848e5f4dd8 100644
--- a/nis/nss_nisplus/nisplus-service.c
+++ b/nis/nss_nisplus/nisplus-service.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997,1998,1999,2001,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997-1999,2001,2002,2003,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
 
@@ -17,13 +17,14 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-#include <errno.h>
+#include <atomic.h>
 #include <ctype.h>
+#include <errno.h>
 #include <netdb.h>
+#include <nss.h>
 #include <string.h>
-#include <bits/libc-lock.h>
 #include <rpcsvc/nis.h>
+#include <bits/libc-lock.h>
 
 #include "nss-nisplus.h"
 
@@ -45,8 +46,6 @@ _nss_nisplus_parse_servent (nis_result *result, struct servent *serv,
 {
   char *first_unused = buffer;
   size_t room_left = buflen;
-  unsigned int i;
-  char *p, *line;
 
   if (result == NULL)
     return 0;
@@ -81,10 +80,10 @@ _nss_nisplus_parse_servent (nis_result *result, struct servent *serv,
   first_unused += strlen (first_unused) + 1;
 
   serv->s_port = htons (atoi (NISENTRYVAL (0, 3, result)));
-  p = first_unused;
+  char *p = first_unused;
 
-  line = p;
-  for (i = 0; i < result->objects.objects_len; ++i)
+  char *line = p;
+  for (unsigned int i = 0; i < result->objects.objects_len; ++i)
     {
       if (strcmp (NISENTRYVAL (i, 1, result), serv->s_name) != 0)
         {
@@ -110,7 +109,7 @@ _nss_nisplus_parse_servent (nis_result *result, struct servent *serv,
   room_left -= (sizeof (char *));
   serv->s_aliases[0] = NULL;
 
-  i = 0;
+  unsigned int i = 0;
   while (*line != '\0')
     {
       /* Skip leading blanks.  */
@@ -147,19 +146,26 @@ _nss_create_tablename (int *errnop)
 {
   if (tablename_val == NULL)
     {
-      char buf [40 + strlen (nis_local_directory ())];
-      char *p;
+      const char *local_dir = nis_local_directory ();
+      size_t local_dir_len = strlen (local_dir);
+      static const char prefix[] = "services.org_dir.";
 
-      p = __stpcpy (buf, "services.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == NULL)
 	{
 	  *errnop = errno;
 	  return NSS_STATUS_TRYAGAIN;
 	}
-      tablename_len = strlen (tablename_val);
+
+      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
+
+      tablename_len = sizeof (prefix) - 1 + local_dir_len;
+
+      atomic_write_barrier ();
+
+      tablename_val = p;
     }
+
   return NSS_STATUS_SUCCESS;
 }
 
@@ -172,9 +178,11 @@ _nss_nisplus_setservent (int stayopen)
 
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   if (tablename_val == NULL)
     status = _nss_create_tablename (&err);
@@ -189,9 +197,11 @@ _nss_nisplus_endservent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   __libc_lock_unlock (lock);
 
@@ -226,11 +236,8 @@ internal_nisplus_getservent_r (struct servent *serv, char *buffer,
 	}
       else
 	{
-	  nis_result *res;
-
 	  saved_res = result;
-	  res = nis_next_entry (tablename_val, &result->cookie);
-	  result = res;
+	  result = nis_next_entry (tablename_val, &result->cookie);
 	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 	    {
 	      nis_freeresult (saved_res);
@@ -240,7 +247,7 @@ internal_nisplus_getservent_r (struct servent *serv, char *buffer,
 
       parse_res = _nss_nisplus_parse_servent (result, serv, buffer,
 					      buflen, errnop);
-      if (parse_res == -1)
+      if (__builtin_expect (parse_res == -1, 0))
 	{
 	  nis_freeresult (result);
 	  result = saved_res;
@@ -262,11 +269,9 @@ enum nss_status
 _nss_nisplus_getservent_r (struct servent *result, char *buffer,
 			   size_t buflen, int *errnop)
 {
-  int status;
-
   __libc_lock_lock (lock);
 
-  status = internal_nisplus_getservent_r (result, buffer, buflen, errnop);
+  int status = internal_nisplus_getservent_r (result, buffer, buflen, errnop);
 
   __libc_lock_unlock (lock);
 
@@ -278,12 +283,14 @@ _nss_nisplus_getservbyname_r (const char *name, const char *protocol,
 			      struct servent *serv,
 			      char *buffer, size_t buflen, int *errnop)
 {
-  int parse_res;
-
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
@@ -293,72 +300,82 @@ _nss_nisplus_getservbyname_r (const char *name, const char *protocol,
       *errnop = EINVAL;
       return NSS_STATUS_NOTFOUND;
     }
-  else
-    {
-      nis_result *result;
-      char buf[strlen (name) + 255 + tablename_len];
-      int olderr = errno;
 
-      /* Search at first in the alias list, and use the correct name
-         for the next search */
-      sprintf (buf, "[name=%s,proto=%s],%s", name, protocol,
-	       tablename_val);
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+  size_t protocol_len = strlen (protocol);
+  char buf[strlen (name) + protocol_len + 17 + tablename_len];
+  int olderr = errno;
 
-      if (result != NULL)
-	{
-	  /* If we do not find it, try it as original name. But if the
-	     database is correct, we should find it in the first case, too */
-	  if ((result->status != NIS_SUCCESS
-	       && result->status != NIS_S_SUCCESS)
-	      || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
-	      || strcmp (result->objects.objects_val->EN_data.en_type,
-			 "services_tbl") != 0
-	      || result->objects.objects_val->EN_data.en_cols.en_cols_len < 4)
-	    sprintf (buf, "[cname=%s,proto=%s],%s", name, protocol,
-		     tablename_val);
-	  else
-	    sprintf (buf, "[cname=%s,proto=%s],%s",
-		     NISENTRYVAL (0, 0, result), protocol, tablename_val);
-
-	  nis_freeresult (result);
-	  result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
-	}
+  /* Search at first in the alias list, and use the correct name
+     for the next search */
+  snprintf (buf, sizeof (buf), "[name=%s,proto=%s],%s", name, protocol,
+	    tablename_val);
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-      if (result == NULL)
+  if (result != NULL)
+    {
+      char *bufptr = buf;
+
+      /* If we did not find it, try it as original name. But if the
+	 database is correct, we should find it in the first case, too */
+      if ((result->status != NIS_SUCCESS
+	   && result->status != NIS_S_SUCCESS)
+	  || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
+	  || strcmp (result->objects.objects_val->EN_data.en_type,
+		     "services_tbl") != 0
+	  || result->objects.objects_val->EN_data.en_cols.en_cols_len < 4)
+	snprintf (buf, sizeof (buf), "[cname=%s,proto=%s],%s", name, protocol,
+		  tablename_val);
+      else
 	{
-	  *errnop = ENOMEM;
-	  return NSS_STATUS_TRYAGAIN;
+	  /* We need to allocate a new buffer since there is no
+	     guarantee the returned name has a length limit.  */
+	  const char *entryval = NISENTRYVAL(0, 0, result);
+	  size_t buflen = (strlen (entryval) + protocol_len + 17
+			   + tablename_len);
+	  bufptr = alloca (buflen);
+	  snprintf (bufptr, buflen, "[cname=%s,proto=%s],%s",
+		    entryval, protocol, tablename_val);
 	}
-      if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
-	{
-	  enum nss_status status = niserr2nss (result->status);
 
-	  __set_errno (olderr);
+      nis_freeresult (result);
+      result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+    }
 
-	  nis_freeresult (result);
-	  return status;
-	}
+  if (result == NULL)
+    {
+      *errnop = ENOMEM;
+      return NSS_STATUS_TRYAGAIN;
+    }
+
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+    {
+      enum nss_status status = niserr2nss (result->status);
+
+      __set_errno (olderr);
 
-      parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
-					      errnop);
       nis_freeresult (result);
+      return status;
+    }
+
+  int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
+					      errnop);
+  nis_freeresult (result);
 
-      if (parse_res < 1)
+  if (__builtin_expect (parse_res < 1, 0))
+    {
+      if (parse_res == -1)
 	{
-	  if (parse_res == -1)
-	    {
-	      *errnop = ERANGE;
-	      return NSS_STATUS_TRYAGAIN;
-	    }
-	  else
-	    {
-	      __set_errno (olderr);
-	      return NSS_STATUS_NOTFOUND;
-	    }
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+      else
+	{
+	  __set_errno (olderr);
+	  return NSS_STATUS_NOTFOUND;
 	}
-      return NSS_STATUS_SUCCESS;
     }
+
+  return NSS_STATUS_SUCCESS;
 }
 
 enum nss_status
@@ -368,8 +385,12 @@ _nss_nisplus_getservbyport_r (const int number, const char *protocol,
 {
   if (tablename_val == NULL)
     {
+      __libc_lock_lock (lock);
+
       enum nss_status status = _nss_create_tablename (errnop);
 
+      __libc_lock_unlock (lock);
+
       if (status != NSS_STATUS_SUCCESS)
 	return status;
     }
@@ -379,50 +400,48 @@ _nss_nisplus_getservbyport_r (const int number, const char *protocol,
       *errnop = EINVAL;
       return NSS_STATUS_NOTFOUND;
     }
-  else
-    {
-      int parse_res;
-      nis_result *result;
-      char buf[60 + strlen (protocol) + tablename_len];
-      int olderr = errno;
 
-      sprintf (buf, "[port=%d,proto=%s],%s",
-	       number, protocol, tablename_val);
+  char buf[17 + 3 * sizeof (int) + strlen (protocol) + tablename_len];
+  int olderr = errno;
 
-      result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+  snprintf (buf, sizeof (buf), "[port=%d,proto=%s],%s",
+	    number, protocol, tablename_val);
 
-      if (result == NULL)
-	{
-	  *errnop = ENOMEM;
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
-	{
-	  enum nss_status status = niserr2nss (result->status);
+  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 
-	  __set_errno (olderr);
+  if (result == NULL)
+    {
+      *errnop = ENOMEM;
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-	  nis_freeresult (result);
-	  return status;
-	}
+  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+    {
+      enum nss_status status = niserr2nss (result->status);
+
+      __set_errno (olderr);
 
-      parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
-					      errnop);
       nis_freeresult (result);
+      return status;
+    }
+
+  int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
+					      errnop);
+  nis_freeresult (result);
 
-      if (parse_res < 1)
+  if (__builtin_expect (parse_res < 1, 0))
+    {
+      if (parse_res == -1)
 	{
-	  if (parse_res == -1)
-	    {
-	      *errnop = ERANGE;
-	      return NSS_STATUS_TRYAGAIN;
-	    }
-	  else
-	    {
-	      __set_errno (olderr);
-	      return NSS_STATUS_NOTFOUND;
-	    }
+	  *errnop = ERANGE;
+	  return NSS_STATUS_TRYAGAIN;
+	}
+      else
+	{
+	  __set_errno (olderr);
+	  return NSS_STATUS_NOTFOUND;
 	}
-      return NSS_STATUS_SUCCESS;
     }
+
+  return NSS_STATUS_SUCCESS;
 }