| /* |
| * 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); |
| } |