Lucas De Marchi | 780a4e9 | 2016-08-10 14:20:32 -0300 | [diff] [blame] | 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 | |
| 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 | |
| 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 | |
| 56 | void scratchbuf_release(struct scratchbuf *buf) |
| 57 | { |
| 58 | if (buf->need_free) |
| 59 | free(buf->bytes); |
| 60 | } |