Fix for GUC client_encoding variable not being handled

correctly. See following thread for more details.

Subject: [HACKERS] client_encoding directive is ignored in postgresql.conf
From: Tatsuo Ishii <t-ishii@sra.co.jp>
Date: Wed, 29 Jan 2003 22:24:04 +0900 (JST)

src/backend/utils/init/postinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.118 2002/11/21 06:36:08 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.119 2003/02/19 14:31:26 ishii Exp $
  *
  *
  *-------------------------------------------------------------------------
@@ -397,6 +397,9 @@ InitPostgres(const char *dbname, const char *username)
 	/* set default namespace search path */
 	InitializeSearchPath();
 
+	/* initialize client encoding */
+	InitializeClientEncoding();
+
 	/*
 	 * Set up process-exit callback to do pre-shutdown cleanup.  This
 	 * should be last because we want shmem_exit to call this routine

src/backend/utils/mb/mbutils.c

@@ -4,7 +4,7 @@
  * (currently mule internal code (mic) is used)
  * Tatsuo Ishii
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/mb/mbutils.c,v 1.37 2002/11/26 02:22:29 ishii Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/mb/mbutils.c,v 1.38 2003/02/19 14:31:26 ishii Exp $
  */
 #include "postgres.h"
 
@@ -37,6 +37,8 @@ static unsigned char *perform_default_encoding_conversion(unsigned char *src,
 									int len, bool is_client_to_server);
 static int cliplen(const unsigned char *str, int len, int limit);
 
+/* Flag to we need to initialize client encoding info */
+static bool need_to_init_client_encoding = -1;
 
 /*
  * Set the client encoding and save fmgrinfo for the converion
@@ -58,6 +60,13 @@ SetClientEncoding(int encoding, bool doit)
 	if (!PG_VALID_FE_ENCODING(encoding))
 		return (-1);
 
+	/* If we cannot actualy set client encoding info, remeber it
+	 * so that we could set it using InitializeClientEncoding()
+	 * in InitPostgres()
+	 */
+	if (current_server_encoding != encoding && !IsTransactionState())
+		need_to_init_client_encoding = encoding;
+
 	if (current_server_encoding == encoding ||
 	(current_server_encoding == PG_SQL_ASCII || encoding == PG_SQL_ASCII))
 	{
@@ -115,6 +124,19 @@ SetClientEncoding(int encoding, bool doit)
 	return 0;
 }
 
+/* Initialize client encoding if necessary.
+ * called from InitPostgres() once during backend starting up.
+ */
+void
+InitializeClientEncoding()
+{
+	if (need_to_init_client_encoding > 0)
+	{
+		SetClientEncoding(need_to_init_client_encoding, 1);
+		need_to_init_client_encoding = -1;
+	}
+}
+
 /*
  * returns the current client encoding */
 int

src/include/mb/pg_wchar.h

@@ -1,4 +1,4 @@
-/* $Id: pg_wchar.h,v 1.44 2002/09/04 20:31:42 momjian Exp $ */
+/* $Id: pg_wchar.h,v 1.45 2003/02/19 14:31:26 ishii Exp $ */
 
 #ifndef PG_WCHAR_H
 #define PG_WCHAR_H
@@ -295,6 +295,7 @@ extern int	pg_database_encoding_max_length(void);
 
 extern void SetDefaultClientEncoding(void);
 extern int	SetClientEncoding(int encoding, bool doit);
+extern void	InitializeClientEncoding(void);
 extern int	pg_get_client_encoding(void);
 extern const char *pg_get_client_encoding_name(void);
 

src/interfaces/libpq/fe-connect.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.223 2003/02/14 01:24:26 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.224 2003/02/19 14:31:26 ishii Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1744,7 +1744,7 @@ PQsetenvPoll(PGconn *conn)
 						 * server for it.  We must use begin/commit in
 						 * case autocommit is off by default.
 						 */
-						if (!PQsendQuery(conn, "begin; select getdatabaseencoding(); commit"))
+						if (!PQsendQuery(conn, "begin; select pg_client_encoding(); commit"))
 							goto error_return;
 
 						conn->setenv_state = SETENV_STATE_ENCODINGS_WAIT;