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/* Copyright (C) 2000 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 */
/* This file defines structures needed by udf functions */
#ifdef __GNUC__
#pragma interface
#endif
enum Item_udftype {UDFTYPE_FUNCTION=1,UDFTYPE_AGGREGATE};
typedef struct st_udf_func
{
char *name;
int name_length;
Item_result returns;
Item_udftype type;
char *dl;
void *dlhandle;
void *func;
void *func_init;
void *func_deinit;
void *func_reset;
void *func_add;
ulong usage_count;
} udf_func;
class Item_result_field;
struct st_table_list;
class udf_handler :public Sql_alloc
{
protected:
udf_func *u_d;
String *buffers;
UDF_ARGS f_args;
UDF_INIT initid;
char *num_buffer;
uchar error;
bool initialized;
Item **args;
public:
table_map used_tables_cache;
bool const_item_cache;
udf_handler(udf_func *udf_arg) :u_d(udf_arg), buffers(0), error(0),
initialized(0)
{}
~udf_handler();
const char *name() const { return u_d ? u_d->name : "?"; }
Item_result result_type () const
{ return u_d ? u_d->returns : STRING_RESULT;}
bool get_arguments();
bool fix_fields(THD *thd,struct st_table_list *tlist,Item_result_field *item,
uint arg_count,Item **args);
double val(my_bool *null_value)
{
if (get_arguments())
{
*null_value=1;
return 0.0;
}
uchar is_null=0;
double (*func)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)=
(double (*)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)) u_d->func;
double tmp=func(&initid, &f_args, &is_null, &error);
if (is_null || error)
{
*null_value=1;
return 0.0;
}
*null_value=0;
return tmp;
}
longlong val_int(my_bool *null_value)
{
if (get_arguments())
{
*null_value=1;
return LL(0);
}
uchar is_null=0;
longlong (*func)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)=
(longlong (*)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)) u_d->func;
longlong tmp=func(&initid, &f_args, &is_null, &error);
if (is_null || error)
{
*null_value=1;
return LL(0);
}
*null_value=0;
return tmp;
}
void reset(my_bool *null_value)
{
uchar is_null=0;
if (get_arguments())
{
*null_value=1;
return;
}
void (*func)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)=
(void (*)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)) u_d->func_reset;
func(&initid, &f_args, &is_null, &error);
*null_value= (my_bool) (is_null || error);
}
void add(my_bool *null_value)
{
uchar is_null=0;
if (get_arguments())
{
*null_value=1;
return;
}
void (*func)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)=
(void (*)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *)) u_d->func_add;
func(&initid, &f_args, &is_null, &error);
*null_value= (my_bool) (is_null || error);
}
String *val_str(String *str,String *save_str);
};
#ifdef HAVE_DLOPEN
void udf_init(void),udf_free(void);
udf_func *find_udf(const char *name, uint len=0,bool mark_used=0);
void free_udf(udf_func *udf);
int mysql_create_function(THD *thd,udf_func *udf);
int mysql_drop_function(THD *thd,const char *name);
#endif
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