Fix dblink to treat connection names longer than NAMEDATALEN-2 (62 bytes).

Now long names are adjusted with truncate_identifier() and NOTICE messages
are raised if names are actually truncated.

Backported to release 8.0.

contrib/dblink/dblink.c

@@ -8,7 +8,7 @@
  * Darko Prenosil <Darko.Prenosil@finteh.hr>
  * Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
  *
- * $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.91 2010/02/26 02:00:32 momjian Exp $
+ * $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.92 2010/06/03 09:38:33 itagaki Exp $
  * Copyright (c) 2001-2010, PostgreSQL Global Development Group
  * ALL RIGHTS RESERVED;
  *
@@ -54,6 +54,7 @@
 #include "nodes/nodes.h"
 #include "nodes/pg_list.h"
 #include "parser/parse_type.h"
+#include "parser/scansup.h"
 #include "utils/acl.h"
 #include "utils/array.h"
 #include "utils/builtins.h"
@@ -2193,13 +2194,13 @@ static remoteConn *
 getConnectionByName(const char *name)
 {
 	remoteConnHashEnt *hentry;
-	char		key[NAMEDATALEN];
+	char	   *key;
 
 	if (!remoteConnHash)
 		remoteConnHash = createConnHash();
 
-	MemSet(key, 0, NAMEDATALEN);
-	snprintf(key, NAMEDATALEN - 1, "%s", name);
+	key = pstrdup(name);
+	truncate_identifier(key, strlen(key), true);
 	hentry = (remoteConnHashEnt *) hash_search(remoteConnHash,
 											   key, HASH_FIND, NULL);
 
@@ -2225,13 +2226,13 @@ createNewConnection(const char *name, remoteConn *rconn)
 {
 	remoteConnHashEnt *hentry;
 	bool		found;
-	char		key[NAMEDATALEN];
+	char	   *key;
 
 	if (!remoteConnHash)
 		remoteConnHash = createConnHash();
 
-	MemSet(key, 0, NAMEDATALEN);
-	snprintf(key, NAMEDATALEN - 1, "%s", name);
+	key = pstrdup(name);
+	truncate_identifier(key, strlen(key), true);
 	hentry = (remoteConnHashEnt *) hash_search(remoteConnHash, key,
 											   HASH_ENTER, &found);
 
@@ -2249,14 +2250,13 @@ deleteConnection(const char *name)
 {
 	remoteConnHashEnt *hentry;
 	bool		found;
-	char		key[NAMEDATALEN];
+	char	   *key;
 
 	if (!remoteConnHash)
 		remoteConnHash = createConnHash();
 
-	MemSet(key, 0, NAMEDATALEN);
-	snprintf(key, NAMEDATALEN - 1, "%s", name);
-
+	key = pstrdup(name);
+	truncate_identifier(key, strlen(key), true);
 	hentry = (remoteConnHashEnt *) hash_search(remoteConnHash,
 											   key, HASH_REMOVE, &found);
 
@@ -2390,10 +2390,12 @@ get_connect_string(const char *servername)
 	StringInfo	buf = makeStringInfo();
 	ForeignDataWrapper *fdw;
 	AclResult	aclresult;
+	char	   *srvname;
 
 	/* first gather the server connstr options */
-	if (strlen(servername) < NAMEDATALEN)
-		foreign_server = GetForeignServerByName(servername, true);
+	srvname = pstrdup(servername);
+	truncate_identifier(srvname, strlen(srvname), true);
+	foreign_server = GetForeignServerByName(srvname, true);
 
 	if (foreign_server)
 	{