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/* Copyright (C) 2000 MySQL 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; version 2 of the License.
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 implements 'user defined functions' */
/*
Known bugs:
*/
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
#include <mysys/my_pthread.h>
extern "C"
{
#include <stdarg.h>
#include <mysys/hash.h>
}
static bool udf_startup= false; /* We do not lock because startup is single threaded */
static MEM_ROOT mem;
static HASH udf_hash;
extern "C" uchar* get_hash_key(const uchar *buff, size_t *length,
bool not_used __attribute__((unused)))
{
udf_func *udf= (udf_func*) buff;
*length= (uint) udf->name.length;
return (uchar*) udf->name.str;
}
void udf_init()
{
init_sql_alloc(&mem, UDF_ALLOC_BLOCK_SIZE, 0);
if (hash_init(&udf_hash, system_charset_info, 32, 0, 0, get_hash_key, NULL, 0))
{
sql_print_error("Can't allocate memory for udf structures");
hash_free(&udf_hash);
free_root(&mem, MYF(0));
return;
}
}
/* called by mysqld.cc clean_up() */
void udf_free()
{
hash_free(&udf_hash);
free_root(&mem, MYF(0));
}
/* This is only called if using_udf_functions != 0 */
udf_func *find_udf(const char *name, uint length)
{
udf_func *udf;
if (udf_startup == false)
return NULL;
udf= (udf_func*) hash_search(&udf_hash,
(uchar*) name,
length ? length : (uint) strlen(name));
return (udf);
}
static bool add_udf(udf_func *udf)
{
if (my_hash_insert(&udf_hash, (uchar*) udf))
return false;
using_udf_functions= 1;
return true;
}
int initialize_udf(st_plugin_int *plugin)
{
udf_func *udff;
if (udf_startup == false)
{
udf_init();
udf_startup= true;
}
/* allocate the udf_func structure */
udff = (udf_func *)my_malloc(sizeof(udf_func), MYF(MY_WME | MY_ZEROFILL));
if (udff == NULL) return 1;
plugin->data= (void *)udff;
if (plugin->plugin->init)
{
/* todo, if the plugin doesnt have an init, bail out */
if (plugin->plugin->init((void *)udff))
{
sql_print_error("Plugin '%s' init function returned error.",
plugin->name.str);
goto err;
}
}
add_udf(udff);
return 0;
err:
my_free(udff, MYF(0));
return 1;
}
int finalize_udf(st_plugin_int *plugin)
{
udf_func *udff = (udf_func *)plugin->data;
/* TODO: Issue warning on failure */
if (udff && plugin->plugin->deinit)
(void)plugin->plugin->deinit(udff);
if (udff)
my_free(udff, MYF(0));
return 0;
}
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