1 /*
2 * kmod - interface to kernel module operations
3 *
4 * Copyright (C) 2016 Intel Corporation. All rights reserved.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19 #include "scratchbuf.h"
20
21 #include <errno.h>
22 #include <string.h>
23
scratchbuf_init(struct scratchbuf * buf,char * stackbuf,size_t size)24 void scratchbuf_init(struct scratchbuf *buf, char *stackbuf, size_t size)
25 {
26 buf->bytes = stackbuf;
27 buf->size = size;
28 buf->need_free = false;
29 }
30
scratchbuf_alloc(struct scratchbuf * buf,size_t size)31 int scratchbuf_alloc(struct scratchbuf *buf, size_t size)
32 {
33 char *tmp;
34
35 if (size <= buf->size)
36 return 0;
37
38 if (buf->need_free) {
39 tmp = realloc(buf->bytes, size);
40 if (tmp == NULL)
41 return -ENOMEM;
42 } else {
43 tmp = malloc(size);
44 if (tmp == NULL)
45 return -ENOMEM;
46 memcpy(tmp, buf->bytes, buf->size);
47 }
48
49 buf->size = size;
50 buf->bytes = tmp;
51 buf->need_free = true;
52
53 return 0;
54 }
55
scratchbuf_release(struct scratchbuf * buf)56 void scratchbuf_release(struct scratchbuf *buf)
57 {
58 if (buf->need_free)
59 free(buf->bytes);
60 }
61