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 | |
28ab034a | 12 | struct lttng_buffer_view lttng_buffer_view_init(const char *src, size_t offset, ptrdiff_t len) |
b35aac84 | 13 | { |
a6bc4ca9 | 14 | struct lttng_buffer_view view = { .data = src + offset, .size = (size_t) len }; |
b35aac84 JG |
15 | return view; |
16 | } | |
17 | ||
3e6e0df2 JG |
18 | bool lttng_buffer_view_is_valid(const struct lttng_buffer_view *view) |
19 | { | |
20 | return view && view->data && view->size > 0; | |
21 | } | |
22 | ||
28ab034a JG |
23 | struct lttng_buffer_view |
24 | lttng_buffer_view_from_view(const struct lttng_buffer_view *src, size_t offset, ptrdiff_t len) | |
01dc0eed | 25 | { |
cd9adb8b | 26 | struct lttng_buffer_view view = { .data = nullptr, .size = 0 }; |
01dc0eed | 27 | |
a0377dfe | 28 | LTTNG_ASSERT(src); |
01dc0eed JG |
29 | |
30 | if (offset > src->size) { | |
df62dbcd | 31 | ERR("Attempt to create buffer view from another view with invalid offset (offset > source size): source size = %zu, offset in source = %zu, length = %zd", |
28ab034a JG |
32 | src->size, |
33 | offset, | |
34 | len); | |
01dc0eed JG |
35 | goto end; |
36 | } | |
37 | ||
38 | if (len != -1 && len > (src->size - offset)) { | |
df62dbcd | 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", |
28ab034a JG |
40 | src->size, |
41 | offset, | |
42 | len); | |
01dc0eed JG |
43 | goto end; |
44 | } | |
45 | ||
46 | view.data = src->data + offset; | |
47 | view.size = len == -1 ? (src->size - offset) : len; | |
48 | end: | |
49 | return view; | |
50 | } | |
51 | ||
52 | struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer( | |
28ab034a | 53 | const struct lttng_dynamic_buffer *src, size_t offset, ptrdiff_t len) |
01dc0eed | 54 | { |
cd9adb8b | 55 | struct lttng_buffer_view view = { .data = nullptr, .size = 0 }; |
01dc0eed | 56 | |
a0377dfe | 57 | LTTNG_ASSERT(src); |
01dc0eed JG |
58 | |
59 | if (offset > src->size) { | |
df62dbcd | 60 | 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", |
28ab034a JG |
61 | src->size, |
62 | offset, | |
63 | len); | |
01dc0eed JG |
64 | goto end; |
65 | } | |
66 | ||
67 | if (len != -1 && len > (src->size - offset)) { | |
df62dbcd | 68 | 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", |
28ab034a JG |
69 | src->size, |
70 | offset, | |
71 | len); | |
01dc0eed JG |
72 | goto end; |
73 | } | |
74 | ||
75 | view.data = src->data + offset; | |
76 | view.size = len == -1 ? (src->size - offset) : len; | |
77 | end: | |
78 | return view; | |
79 | } | |
67d8e2ef | 80 | |
67d8e2ef | 81 | bool lttng_buffer_view_contains_string(const struct lttng_buffer_view *buf, |
28ab034a JG |
82 | const char *str, |
83 | size_t len_with_null_terminator) | |
67d8e2ef SM |
84 | { |
85 | const char *past_buf_end; | |
86 | size_t max_str_len_with_null_terminator; | |
87 | size_t str_len; | |
88 | bool ret; | |
89 | ||
90 | past_buf_end = buf->data + buf->size; | |
91 | ||
92 | /* Is the start of the string in the buffer view? */ | |
93 | if (str < buf->data || str >= past_buf_end) { | |
94 | ret = false; | |
95 | goto end; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Max length the string could have to fit in the buffer, including | |
100 | * NULL terminator. | |
101 | */ | |
102 | max_str_len_with_null_terminator = past_buf_end - str; | |
103 | ||
104 | /* Could the string even fit in the buffer? */ | |
105 | if (len_with_null_terminator > max_str_len_with_null_terminator) { | |
106 | ret = false; | |
107 | goto end; | |
108 | } | |
109 | ||
110 | str_len = lttng_strnlen(str, max_str_len_with_null_terminator); | |
111 | if (str_len != (len_with_null_terminator - 1)) { | |
112 | ret = false; | |
113 | goto end; | |
114 | } | |
115 | ||
116 | ret = true; | |
117 | ||
118 | end: | |
119 | return ret; | |
120 | } |