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/*
* libtalloc based memory allocator for SQLite3.
*
* (C) 2019 by Vadim Yanitskiy <axilirator@gmail.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <sqlite3.h>
#include <talloc.h>
#include <errno.h>
/* Dedicated talloc context for SQLite */
static void *db_sqlite_ctx = NULL;
static void *tall_xMalloc(int size)
{
return talloc_size(db_sqlite_ctx, size);
}
static void tall_xFree(void *ptr)
{
talloc_free(ptr);
}
static void *tall_xRealloc(void *ptr, int size)
{
return talloc_realloc_fn(db_sqlite_ctx, ptr, size);
}
static int tall_xSize(void *ptr)
{
return talloc_total_size(ptr);
}
/* DUMMY: talloc doesn't round up the allocation size */
static int tall_xRoundup(int size) { return size; }
/* DUMMY: nothing to initialize */
static int tall_xInit(void *data) { return 0; }
/* DUMMY: nothing to deinitialize */
static void tall_xShutdown(void *data) { }
/* Interface between SQLite and talloc memory allocator */
static const struct sqlite3_mem_methods tall_sqlite_if = {
/* Memory allocation function */
.xMalloc = &tall_xMalloc,
/* Free a prior allocation */
.xFree = &tall_xFree,
/* Resize an allocation */
.xRealloc = &tall_xRealloc,
/* Return the size of an allocation */
.xSize = &tall_xSize,
/* Round up request size to allocation size */
.xRoundup = &tall_xRoundup,
/* Initialize the memory allocator */
.xInit = &tall_xInit,
/* Deinitialize the memory allocator */
.xShutdown = &tall_xShutdown,
/* Argument to xInit() and xShutdown() */
.pAppData = NULL,
};
int db_sqlite3_use_talloc(void *ctx)
{
if (db_sqlite_ctx != NULL)
return -EEXIST;
db_sqlite_ctx = talloc_named_const(ctx, 0, "SQLite3");
return sqlite3_config(SQLITE_CONFIG_MALLOC, &tall_sqlite_if);
}
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