buffer-view: improve logging on creation failure
[lttng-tools.git] / src / common / buffer-view.c
1 /*
2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
8 #include <common/buffer-view.h>
9 #include <common/dynamic-buffer.h>
10 #include <common/error.h>
11 #include <assert.h>
12
13 LTTNG_HIDDEN
14 struct lttng_buffer_view lttng_buffer_view_init(
15 const char *src, size_t offset, ptrdiff_t len)
16 {
17 struct lttng_buffer_view view = { .data = src + offset, .size = len };
18 return view;
19 }
20
21 LTTNG_HIDDEN
22 bool lttng_buffer_view_is_valid(const struct lttng_buffer_view *view)
23 {
24 return view && view->data && view->size > 0;
25 }
26
27 LTTNG_HIDDEN
28 struct lttng_buffer_view lttng_buffer_view_from_view(
29 const struct lttng_buffer_view *src, size_t offset,
30 ptrdiff_t len)
31 {
32 struct lttng_buffer_view view = { .data = NULL, .size = 0 };
33
34 assert(src);
35
36 if (offset > src->size) {
37 ERR("Attempt to create buffer view from another view with invalid offset (offset > source size): source size = %zu, offset in source = %zu, length = %zd",
38 src->size, offset, len);
39 goto end;
40 }
41
42 if (len != -1 && len > (src->size - offset)) {
43 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",
44 src->size, offset, len);
45 goto end;
46 }
47
48 view.data = src->data + offset;
49 view.size = len == -1 ? (src->size - offset) : len;
50 end:
51 return view;
52 }
53
54 LTTNG_HIDDEN
55 struct lttng_buffer_view lttng_buffer_view_from_dynamic_buffer(
56 const struct lttng_dynamic_buffer *src, size_t offset,
57 ptrdiff_t len)
58 {
59 struct lttng_buffer_view view = { .data = NULL, .size = 0 };
60
61 assert(src);
62
63 if (offset > src->size) {
64 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",
65 src->size, offset, len);
66 goto end;
67 }
68
69 if (len != -1 && len > (src->size - offset)) {
70 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",
71 src->size, offset, len);
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 }
80
81 LTTNG_HIDDEN
82 bool lttng_buffer_view_contains_string(const struct lttng_buffer_view *buf,
83 const char *str,
84 size_t len_with_null_terminator)
85 {
86 const char *past_buf_end;
87 size_t max_str_len_with_null_terminator;
88 size_t str_len;
89 bool ret;
90
91 past_buf_end = buf->data + buf->size;
92
93 /* Is the start of the string in the buffer view? */
94 if (str < buf->data || str >= past_buf_end) {
95 ret = false;
96 goto end;
97 }
98
99 /*
100 * Max length the string could have to fit in the buffer, including
101 * NULL terminator.
102 */
103 max_str_len_with_null_terminator = past_buf_end - str;
104
105 /* Could the string even fit in the buffer? */
106 if (len_with_null_terminator > max_str_len_with_null_terminator) {
107 ret = false;
108 goto end;
109 }
110
111 str_len = lttng_strnlen(str, max_str_len_with_null_terminator);
112 if (str_len != (len_with_null_terminator - 1)) {
113 ret = false;
114 goto end;
115 }
116
117 ret = true;
118
119 end:
120 return ret;
121 }
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