Stubs for types/names of placeholders, cursor flags and array execution count

implemented in the client library and server.
Warning: this makes the new client library and server incompatible with all 
previous versions and 5.0.


libmysql/libmysql.c:
  Make client library compatible with future extensions: types of placeholders, 
   names of named parameters, cursors and array execution.
sql/sql_prepare.cc:
  Alpha server side support for future extensions: types of placeholders and names of
  named parameters are sent to client (virtually), cursor flags and execution
  count received in COM_EXECUTE packet are ignored.

libmysql/libmysql.c

@@ -1846,6 +1846,16 @@ my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
   field_count=   uint2korr(pos);   pos+= 2;
   param_count=   uint2korr(pos);   pos+= 2;
 
+  if (param_count != 0)
+  {
+    MYSQL_DATA *param_data;
+
+    /* skip parameters data: we don't support it yet */
+    if (!(param_data= (*mysql->methods->read_rows)(mysql, (MYSQL_FIELD*)0, 7)))
+      DBUG_RETURN(1);
+    free_rows(param_data);
+  }
+
   if (field_count != 0)
   {
     if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
@@ -2322,15 +2332,17 @@ static my_bool execute(MYSQL_STMT * stmt, char *packet, ulong length)
 {
   MYSQL *mysql= stmt->mysql;
   NET	*net= &mysql->net;
-  char buff[MYSQL_STMT_HEADER];
+  char buff[4 /* size of stmt id */ + 
+            5 /* execution flags */];
   DBUG_ENTER("execute");
   DBUG_PRINT("enter",("packet: %s, length :%d",packet ? packet :" ", length));
 
   mysql->last_used_con= mysql;
   int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
-  if (cli_advanced_command(mysql, COM_EXECUTE, buff, 
-			    MYSQL_STMT_HEADER, packet, 
-			    length, 1) ||
+  buff[4]= (char) 0;                            /* no flags */
+  int4store(buff+5, 1);                         /* iteration count */
+  if (cli_advanced_command(mysql, COM_EXECUTE, buff, sizeof(buff),
+                           packet, length, 1) ||
       (*mysql->methods->read_query_result)(mysql))
   {
     set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);

sql/sql_prepare.cc

@@ -155,8 +155,16 @@ static bool send_prep_stmt(Prepared_statement *stmt, uint columns)
   int4store(buff+1, stmt->id);
   int2store(buff+5, columns);
   int2store(buff+7, stmt->param_count);
-  /* TODO: send types of placeholders here */
-  return (my_net_write(net, buff, sizeof(buff)) || net_flush(net));
+  /*
+    Send types and names of placeholders to the client
+    XXX: fix this nasty upcast from List<Item_param> to List<Item>
+  */
+  return my_net_write(net, buff, sizeof(buff)) || 
+         (stmt->param_count &&
+          stmt->thd->protocol_simple.send_fields((List<Item> *)
+                                                 &stmt->lex->param_list, 0)) ||
+         net_flush(net);
+  return 0;
 }
 #else
 static bool send_prep_stmt(Prepared_statement *stmt,
@@ -1113,10 +1121,13 @@ static void reset_stmt_for_execute(Prepared_statement *stmt)
 void mysql_stmt_execute(THD *thd, char *packet, uint packet_length)
 {
   ulong stmt_id= uint4korr(packet);
+  uchar *packet_end= (uchar *) packet + packet_length - 1;
   Prepared_statement *stmt;
 
   DBUG_ENTER("mysql_stmt_execute");
 
+  packet+= 9;                               /* stmt_id + 5 bytes of flags */
+  
   if (!(stmt= find_prepared_statement(thd, stmt_id, "execute", SEND_ERROR)))
     DBUG_VOID_RETURN;
 
@@ -1135,8 +1146,6 @@ void mysql_stmt_execute(THD *thd, char *packet, uint packet_length)
 #ifndef EMBEDDED_LIBRARY
   if (stmt->param_count)
   {
-    uchar *packet_end= (uchar *) packet + packet_length - 1;
-    packet+= 4;
     uchar *null_array= (uchar *) packet;
     if (setup_conversion_functions(stmt, (uchar **) &packet, packet_end) ||
         stmt->set_params(stmt, null_array, (uchar *) packet, packet_end))