Fixes for bugs in embedded library:

#4700 (Unsigned value returned as signed)
    just no appropriate checking
#4701 (Errors returned earlier than expected)
    all errors returned from send_command()
#4702 (Result isn't freed properly if there's no retrieval)
    flush_use_result has only 'client' version and should
    be made 'virtual'


include/mysql.h:
  flush_use_result 'virtual' method added to MYSQL (#4701)
include/sql_common.h:
  no flush_use_result() now (#4702)
libmysql/libmysql.c:
  call of the flush_use_result changed (#4702)
libmysqld/lib_sql.cc:
  now errors returned from emb_advanced_command() or from emb_read_rows()
  depending on if number of returned fields is not 0 (#4701)
  emb_flush_use_result() implementation (#4702)
sql-common/client.c:
  cli_flush_use_result() implementation (#4702)
sql/sql_prepare.cc:
  unsigned flag now checked (#4700)

1 files changed, 4 insertions, 3 deletions

diff --git a/sql-common/client.c b/sql-common/client.c
index 738904657cc..3046395f7d2 100644
--- a/sql-common/client.c
+++ b/sql-common/client.c
@@ -723,7 +723,7 @@ void set_mysql_error(MYSQL *mysql, int errcode, const char *sqlstate)
   Flush result set sent from server
 */
 
-void flush_use_result(MYSQL *mysql)
+static void cli_flush_use_result(MYSQL *mysql)
 {
   /* Clear the current execution status */
   DBUG_PRINT("warning",("Not all packets read, clearing them"));
@@ -842,7 +842,7 @@ mysql_free_result(MYSQL_RES *result)
         mysql->unbuffered_fetch_owner= 0;
       if (mysql->status == MYSQL_STATUS_USE_RESULT)
       {
-        flush_use_result(mysql);
+        (*mysql->methods->flush_use_result)(mysql);
         mysql->status=MYSQL_STATUS_READY;
       }
     }
@@ -1493,7 +1493,8 @@ static MYSQL_METHODS client_methods=
   cli_advanced_command,
   cli_read_rows,
   cli_use_result,
-  cli_fetch_lengths
+  cli_fetch_lengths,
+  cli_flush_use_result
 #ifndef MYSQL_SERVER
   ,cli_list_fields,
   cli_read_prepare_result,