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 | ||
8 | #include <common/buffer-view.h> | |
9 | #include <common/dynamic-buffer.h> | |
01dc0eed | 10 | #include <common/error.h> |
01dc0eed | 11 | |
b35aac84 JG |
12 | LTTNG_HIDDEN |
13 | struct lttng_buffer_view lttng_buffer_view_init( | |
14 | const char *src, size_t offset, ptrdiff_t len) | |
15 | { | |
16 | struct lttng_buffer_view view = { .data = src + offset, .size = len }; | |
17 | return view; | |
18 | } | |
19 | ||
3e6e0df2 JG |
20 | LTTNG_HIDDEN |
21 | bool lttng_buffer_view_is_valid(const struct lttng_buffer_view *view) | |
22 | { | |
23 | return view && view->data && view->size > 0; | |
24 | } | |
25 | ||
ff28f865 | 26 | LTTNG_HIDDEN |
01dc0eed JG |
27 | struct lttng_buffer_view lttng_buffer_view_from_view( |
28 | const struct lttng_buffer_view *src, size_t offset, | |
29 | ptrdiff_t len) | |
30 | { | |
31 | struct lttng_buffer_view view = { .data = NULL, .size = 0 }; | |
32 | ||
a0377dfe | 33 | LTTNG_ASSERT(src); |
01dc0eed JG |
34 | |
35 | if (offset > src->size) { | |
df62dbcd JG |
36 | ERR("Attempt to create buffer view from another view with invalid offset (offset > source size): source size = %zu, offset in source = %zu, length = %zd", |
37 | src->size, offset, len); | |
01dc0eed JG |
38 | goto end; |
39 | } | |
40 | ||
41 | if (len != -1 && len > (src->size - offset)) { | |
df62dbcd JG |
42 | 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", |
43 | src->size, offset, len); | |
01dc0eed JG |
44 | goto end; |
45 | } | |
46 | ||
47 | view.data = src->data + offset; | |
48 | view.size = len == -1 ? (src->size - offset) : len; | |
49 | end: | |
50 | return view; | |
51 | } | |
52 | ||
ff28f865 | 53 | LTTNG_HIDDEN |
01dc0eed JG |
54 | struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer( |
55 | const struct lttng_dynamic_buffer *src, size_t offset, | |
56 | ptrdiff_t len) | |
57 | { | |
58 | struct lttng_buffer_view view = { .data = NULL, .size = 0 }; | |
59 | ||
a0377dfe | 60 | LTTNG_ASSERT(src); |
01dc0eed JG |
61 | |
62 | if (offset > src->size) { | |
df62dbcd JG |
63 | 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", |
64 | src->size, offset, len); | |
01dc0eed JG |
65 | goto end; |
66 | } | |
67 | ||
68 | if (len != -1 && len > (src->size - offset)) { | |
df62dbcd JG |
69 | 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", |
70 | src->size, offset, len); | |
01dc0eed JG |
71 | goto end; |
72 | } | |
73 | ||
74 | view.data = src->data + offset; | |
75 | view.size = len == -1 ? (src->size - offset) : len; | |
76 | end: | |
77 | return view; | |
78 | } | |
67d8e2ef SM |
79 | |
80 | LTTNG_HIDDEN | |
81 | bool lttng_buffer_view_contains_string(const struct lttng_buffer_view *buf, | |
82 | const char *str, | |
83 | size_t len_with_null_terminator) | |
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 | } |