2 Unix SMB/Netbios implementation.
4 Samba temporary memory allocation functions
5 Copyright (C) Andrew Tridgell 2000
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* this is a very simple temporary memory allocator. To use it do the following:
24 1) when you first want to allocate a pool of meomry use
25 talloc_init() and save the resulting context pointer somewhere
27 2) to allocate memory use talloc()
29 3) when _all_ of the memory allocated using this context is no longer needed
32 talloc does not zero the memory. It guarantees memory of a
33 TALLOC_ALIGN alignment
38 #define TALLOC_ALIGN 32
39 #define TALLOC_CHUNK_SIZE (0x2000)
41 /* initialissa talloc context. */
42 TALLOC_CTX *talloc_init(void)
46 t = (TALLOC_CTX *)malloc(sizeof(*t));
54 /* allocate a bit of memory from the specified pool */
55 void *talloc(TALLOC_CTX *t, size_t size)
59 size = (size + TALLOC_ALIGN) & (~TALLOC_ALIGN-1);
61 if (!t->list || (t->list->total_size - t->list->alloc_size) < size) {
62 struct talloc_chunk *c;
63 size_t asize = (size + TALLOC_CHUNK_SIZE) & ~(TALLOC_CHUNK_SIZE-1);
65 c = (struct talloc_chunk *)malloc(sizeof(*c));
68 c->ptr = (void *)malloc(asize);
74 c->total_size = asize;
78 p = ((char *)t->list->ptr) + t->list->alloc_size;
79 t->list->alloc_size += size;
83 /* destroy a whole pool */
84 void talloc_destroy(TALLOC_CTX *t)
86 struct talloc_chunk *c;