Fixes for \encoding command.

1) freeing null pointer
	2) invalid encoding info may be stored into psql variable
	3) fix indentation

src/bin/psql/command.c

@@ -3,7 +3,7 @@
  *
  * Copyright 2000 by PostgreSQL Global Development Group
  *
- * $Header: /cvsroot/pgsql/src/bin/psql/command.c,v 1.22 2000/02/20 14:28:20 petere Exp $
+ * $Header: /cvsroot/pgsql/src/bin/psql/command.c,v 1.23 2000/02/21 02:05:12 ishii Exp $
  */
 #include "postgres.h"
 #include "command.h"
@@ -354,28 +354,33 @@ exec_command(const char *cmd,
             fputs("\n", fout);
 	}
 
-	/* \encoding -- set client side encoding */
+	/* \encoding -- set/show client side encoding */
 	else if (strcmp(cmd, "encoding") == 0)
 	{
 		char *encoding = scan_option(&string, OT_NORMAL, NULL);
 
 	        if (!encoding)
+			/* show encoding */
 			puts(pg_encoding_to_char(pset.encoding));
 	        else
 		{
 #ifdef MULTIBYTE
+			/* set encoding */
 			if (PQsetClientEncoding(pset.db, encoding) == -1)
 				psql_error("%s: invalid encoding name\n", encoding);
 
+			else
+			{
 				/* save encoding info into psql internal data */
 				pset.encoding = PQclientEncoding(pset.db);
 				SetVariable(pset.vars, "ENCODING", pg_encoding_to_char(pset.encoding));
+			}
 #else
 			psql_error("\\%s: multi-byte support is not enabled\n", cmd);
 #endif
-        }
 		        free(encoding);
 	        }
+	}
 
 	/* \f -- change field separator */
 	else if (strcmp(cmd, "f") == 0)