2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: LGPL-2.1-only
8 #include <common/buffer-view.h>
9 #include <common/dynamic-buffer.h>
10 #include <common/error.h>
13 struct lttng_buffer_view
lttng_buffer_view_init(
14 const char *src
, size_t offset
, ptrdiff_t len
)
16 struct lttng_buffer_view view
= { .data
= src
+ offset
, .size
= len
};
21 bool lttng_buffer_view_is_valid(const struct lttng_buffer_view
*view
)
23 return view
&& view
->data
&& view
->size
> 0;
27 struct lttng_buffer_view
lttng_buffer_view_from_view(
28 const struct lttng_buffer_view
*src
, size_t offset
,
31 struct lttng_buffer_view view
= { .data
= NULL
, .size
= 0 };
35 if (offset
> src
->size
) {
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
);
41 if (len
!= -1 && len
> (src
->size
- offset
)) {
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
);
47 view
.data
= src
->data
+ offset
;
48 view
.size
= len
== -1 ? (src
->size
- offset
) : len
;
54 struct lttng_buffer_view
lttng_buffer_view_from_dynamic_buffer(
55 const struct lttng_dynamic_buffer
*src
, size_t offset
,
58 struct lttng_buffer_view view
= { .data
= NULL
, .size
= 0 };
62 if (offset
> src
->size
) {
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
);
68 if (len
!= -1 && len
> (src
->size
- offset
)) {
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
);
74 view
.data
= src
->data
+ offset
;
75 view
.size
= len
== -1 ? (src
->size
- offset
) : len
;
81 bool lttng_buffer_view_contains_string(const struct lttng_buffer_view
*buf
,
83 size_t len_with_null_terminator
)
85 const char *past_buf_end
;
86 size_t max_str_len_with_null_terminator
;
90 past_buf_end
= buf
->data
+ buf
->size
;
92 /* Is the start of the string in the buffer view? */
93 if (str
< buf
->data
|| str
>= past_buf_end
) {
99 * Max length the string could have to fit in the buffer, including
102 max_str_len_with_null_terminator
= past_buf_end
- str
;
104 /* Could the string even fit in the buffer? */
105 if (len_with_null_terminator
> max_str_len_with_null_terminator
) {
110 str_len
= lttng_strnlen(str
, max_str_len_with_null_terminator
);
111 if (str_len
!= (len_with_null_terminator
- 1)) {