Add kernel uid/gid contexts
[lttng-tools.git] / src / common / buffer-view.c
... / ...
CommitLineData
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/error.h>
21#include <assert.h>
22
23LTTNG_HIDDEN
24struct lttng_buffer_view lttng_buffer_view_init(
25 const char *src, size_t offset, ptrdiff_t len)
26{
27 struct lttng_buffer_view view = { .data = src + offset, .size = len };
28 return view;
29}
30
31LTTNG_HIDDEN
32struct lttng_buffer_view lttng_buffer_view_from_view(
33 const struct lttng_buffer_view *src, size_t offset,
34 ptrdiff_t len)
35{
36 struct lttng_buffer_view view = { .data = NULL, .size = 0 };
37
38 assert(src);
39
40 if (offset > src->size) {
41 ERR("Attempt to create buffer view with invalid offset");
42 goto end;
43 }
44
45 if (len != -1 && len > (src->size - offset)) {
46 ERR("Attempt to create buffer view with invalid length");
47 goto end;
48 }
49
50 view.data = src->data + offset;
51 view.size = len == -1 ? (src->size - offset) : len;
52end:
53 return view;
54}
55
56LTTNG_HIDDEN
57struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
58 const struct lttng_dynamic_buffer *src, size_t offset,
59 ptrdiff_t len)
60{
61 struct lttng_buffer_view view = { .data = NULL, .size = 0 };
62
63 assert(src);
64
65 if (offset > src->size) {
66 ERR("Attempt to create buffer view with invalid offset");
67 goto end;
68 }
69
70 if (len != -1 && len > (src->size - offset)) {
71 ERR("Attempt to create buffer view with invalid length");
72 goto end;
73 }
74
75 view.data = src->data + offset;
76 view.size = len == -1 ? (src->size - offset) : len;
77end:
78 return view;
79}
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