Commit | Line | Data |
---|---|---|
01dc0eed | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
01dc0eed | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
01dc0eed | 5 | * |
01dc0eed JG |
6 | */ |
7 | ||
c9e313bc SM |
8 | #include <common/buffer-view.hpp> |
9 | #include <common/dynamic-buffer.hpp> | |
10 | #include <common/error.hpp> | |
01dc0eed | 11 | |
b35aac84 JG |
12 | struct lttng_buffer_view lttng_buffer_view_init( |
13 | const char *src, size_t offset, ptrdiff_t len) | |
14 | { | |
a6bc4ca9 | 15 | struct lttng_buffer_view view = { .data = src + offset, .size = (size_t) len }; |
b35aac84 JG |
16 | return view; |
17 | } | |
18 | ||
3e6e0df2 JG |
19 | bool lttng_buffer_view_is_valid(const struct lttng_buffer_view *view) |
20 | { | |
21 | return view && view->data && view->size > 0; | |
22 | } | |
23 | ||
01dc0eed JG |
24 | struct 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 | ||
a0377dfe | 30 | LTTNG_ASSERT(src); |
01dc0eed JG |
31 | |
32 | if (offset > src->size) { | |
df62dbcd JG |
33 | ERR("Attempt to create buffer view from another view with invalid offset (offset > source size): source size = %zu, offset in source = %zu, length = %zd", |
34 | src->size, offset, len); | |
01dc0eed JG |
35 | goto end; |
36 | } | |
37 | ||
38 | if (len != -1 && len > (src->size - offset)) { | |
df62dbcd JG |
39 | ERR("Attempt to create buffer view from another view with invalid length (length > space left after offset in source): source size = %zu, offset in source = %zu, length = %zd", |
40 | src->size, offset, len); | |
01dc0eed JG |
41 | goto end; |
42 | } | |
43 | ||
44 | view.data = src->data + offset; | |
45 | view.size = len == -1 ? (src->size - offset) : len; | |
46 | end: | |
47 | return view; | |
48 | } | |
49 | ||
50 | struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer( | |
51 | const struct lttng_dynamic_buffer *src, size_t offset, | |
52 | ptrdiff_t len) | |
53 | { | |
54 | struct lttng_buffer_view view = { .data = NULL, .size = 0 }; | |
55 | ||
a0377dfe | 56 | LTTNG_ASSERT(src); |
01dc0eed JG |
57 | |
58 | if (offset > src->size) { | |
df62dbcd JG |
59 | ERR("Attempt to create buffer view from a dynamic buffer with invalid offset (offset > source size): source size = %zu, offset in source = %zu, length = %zd", |
60 | src->size, offset, len); | |
01dc0eed JG |
61 | goto end; |
62 | } | |
63 | ||
64 | if (len != -1 && len > (src->size - offset)) { | |
df62dbcd JG |
65 | ERR("Attempt to create buffer view from a dynamic buffer with invalid length (length > space left after offset in source): source size = %zu, offset in source = %zu, length = %zd", |
66 | src->size, offset, len); | |
01dc0eed JG |
67 | goto end; |
68 | } | |
69 | ||
70 | view.data = src->data + offset; | |
71 | view.size = len == -1 ? (src->size - offset) : len; | |
72 | end: | |
73 | return view; | |
74 | } | |
67d8e2ef | 75 | |
67d8e2ef SM |
76 | bool lttng_buffer_view_contains_string(const struct lttng_buffer_view *buf, |
77 | const char *str, | |
78 | size_t len_with_null_terminator) | |
79 | { | |
80 | const char *past_buf_end; | |
81 | size_t max_str_len_with_null_terminator; | |
82 | size_t str_len; | |
83 | bool ret; | |
84 | ||
85 | past_buf_end = buf->data + buf->size; | |
86 | ||
87 | /* Is the start of the string in the buffer view? */ | |
88 | if (str < buf->data || str >= past_buf_end) { | |
89 | ret = false; | |
90 | goto end; | |
91 | } | |
92 | ||
93 | /* | |
94 | * Max length the string could have to fit in the buffer, including | |
95 | * NULL terminator. | |
96 | */ | |
97 | max_str_len_with_null_terminator = past_buf_end - str; | |
98 | ||
99 | /* Could the string even fit in the buffer? */ | |
100 | if (len_with_null_terminator > max_str_len_with_null_terminator) { | |
101 | ret = false; | |
102 | goto end; | |
103 | } | |
104 | ||
105 | str_len = lttng_strnlen(str, max_str_len_with_null_terminator); | |
106 | if (str_len != (len_with_null_terminator - 1)) { | |
107 | ret = false; | |
108 | goto end; | |
109 | } | |
110 | ||
111 | ret = true; | |
112 | ||
113 | end: | |
114 | return ret; | |
115 | } |