Change function name PQclientencoding to PQclientEncoding since

it seems more suitable for the naming convention in libpq.

New function PQsetClientEncoding added. It makes possible to change
the client encoding on the fly without setting PGCLIENTENCODING.

src/interfaces/libpq/fe-connect.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.116 2000/01/26 05:58:45 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.117 2000/02/05 12:33:22 ishii Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -41,6 +41,7 @@
 #endif
 
 #ifdef MULTIBYTE
+#include "miscadmin.h"
 #include "mb/pg_wchar.h"
 #endif
 
@@ -2381,13 +2382,54 @@ PQbackendPID(const PGconn *conn)
 }
 
 int
-PQclientencoding(const PGconn *conn)
+PQclientEncoding(const PGconn *conn)
 {
 	if (!conn || conn->status != CONNECTION_OK)
 		return -1;
 	return conn->client_encoding;
 }
 
+#ifdef MULTIBYTE
+int
+PQsetClientEncoding(PGconn *conn, const char *encoding)
+{
+	char qbuf[128];
+	static char query[] = "set client_encoding to '%s'";
+	PGresult *res;
+	int status;
+
+	if (!conn || conn->status != CONNECTION_OK)
+		return -1;
+
+	/* check query buffer overflow */
+	if (sizeof(qbuf) < (sizeof(query) + strlen(encoding)))
+		return -1;
+
+	/* ok, now send a query */
+	sprintf(qbuf, query, encoding);
+	res = PQexec(conn, qbuf);
+
+	if (res == (PGresult *)NULL)
+		return -1;
+	if (res->resultStatus != PGRES_COMMAND_OK)
+		status = -1;
+	else
+	{
+		/* change libpq internal encoding */
+		conn->client_encoding = pg_char_to_encoding(encoding);
+		status = 0;	/* everything is ok */
+	}
+	PQclear(res);
+	return(status);
+}
+#else
+int
+PQsetClientEncoding(PGconn *conn, const char *encoding)
+{
+	return -1;
+}
+#endif
+
 void
 PQtrace(PGconn *conn, FILE *debug_port)
 {

src/interfaces/libpq/fe-print.c

@@ -10,7 +10,7 @@
  * didn't really belong there.
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-print.c,v 1.33 2000/01/29 16:58:51 petere Exp $
+ *	  $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-print.c,v 1.34 2000/02/05 12:33:22 ishii Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -347,7 +347,7 @@ do_field(const PQprintOpt *po, const PGresult *res,
 			char		ch = '0';
 
 #ifdef MULTIBYTE
-			for (p = pval; *p; p += PQmblen(p, PQclientencoding(res->conn)))
+			for (p = pval; *p; p += PQmblen(p, PQclientEncoding(res->conn)))
 #else
 			for (p = pval; *p; p++)
 #endif

src/interfaces/libpq/libpq-fe.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: libpq-fe.h,v 1.58 2000/01/29 16:58:51 petere Exp $
+ * $Id: libpq-fe.h,v 1.59 2000/02/05 12:33:22 ishii Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -218,7 +218,8 @@ extern		"C"
 	extern const char *PQerrorMessage(const PGconn *conn);
 	extern int	PQsocket(const PGconn *conn);
 	extern int	PQbackendPID(const PGconn *conn);
-	extern int	PQclientencoding(const PGconn *conn);
+	extern int	PQclientEncoding(const PGconn *conn);
+	extern int	PQsetClientEncoding(PGconn *conn, const char *encoding);
 
 	/* Enable/disable tracing */
 	extern void PQtrace(PGconn *conn, FILE *debug_port);