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[lttng-tools.git] / src / common / buffer-view.c
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1/*
2 * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License, version 2.1 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16 */
17
18#include <common/buffer-view.h>
19#include <common/dynamic-buffer.h>
20#include <common/macros.h>
21#include <common/error.h>
22#include <assert.h>
23
24struct lttng_buffer_view lttng_buffer_view_from_view(
25 const struct lttng_buffer_view *src, size_t offset,
26 ptrdiff_t len)
27{
28 struct lttng_buffer_view view = { .data = NULL, .size = 0 };
29
30 assert(src);
31
32 if (offset > src->size) {
33 ERR("Attempt to create buffer view with invalid offset");
34 goto end;
35 }
36
37 if (len != -1 && len > (src->size - offset)) {
38 ERR("Attempt to create buffer view with invalid length");
39 goto end;
40 }
41
42 view.data = src->data + offset;
43 view.size = len == -1 ? (src->size - offset) : len;
44end:
45 return view;
46}
47
48struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
49 const struct lttng_dynamic_buffer *src, size_t offset,
50 ptrdiff_t len)
51{
52 struct lttng_buffer_view view = { .data = NULL, .size = 0 };
53
54 assert(src);
55
56 if (offset > src->size) {
57 ERR("Attempt to create buffer view with invalid offset");
58 goto end;
59 }
60
61 if (len != -1 && len > (src->size - offset)) {
62 ERR("Attempt to create buffer view with invalid length");
63 goto end;
64 }
65
66 view.data = src->data + offset;
67 view.size = len == -1 ? (src->size - offset) : len;
68end:
69 return view;
70}
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