Fix for Bug#4030 "Client side conversion string -> date type doesn't

work (prepared statements)" and after-review fixes:
- str_to_TIME renamed to str_to_datetime to pair with str_to_time
- functions str_to_time and str_to_TIME moved to sql-common
- send_data_str now supports MYSQL_TYPE_TIME, MYSQL_TIME_DATE,
  MYSQL_TIME_DATETIME types of user input buffers.
- few more comments in the client library
- a test case added.

include/mysql_time.h

@@ -0,0 +1,37 @@
+/* Copyright (C) 2004 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef _mysql_time_h_
+#define _mysql_time_h_
+
+/* Time declarations shared between server and client library */
+
+enum enum_mysql_timestamp_type
+{
+  MYSQL_TIMESTAMP_NONE= -2, MYSQL_TIMESTAMP_ERROR= -1,
+  MYSQL_TIMESTAMP_DATE= 0, MYSQL_TIMESTAMP_DATETIME= 1, MYSQL_TIMESTAMP_TIME= 2
+};
+
+
+typedef struct st_mysql_time
+{
+  unsigned int  year, month, day, hour, minute, second;
+  unsigned long second_part;
+  my_bool       neg;
+  enum enum_mysql_timestamp_type time_type;
+} MYSQL_TIME;
+
+#endif /* _mysql_time_h_ */