tests: Implement tests for lttng-ust LTTNG_UST_BLOCKING_RETRY_TIMEOUT
[lttng-tools.git] / src / common / context.c
1 /*
2 * context.c
3 *
4 * LTTng context utilities.
5 *
6 * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
7 *
8 * This library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License, version 2.1 only,
10 * as published by the Free Software Foundation.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "context.h"
23 #include <stddef.h>
24 #include <string.h>
25 #include <common/error.h>
26 #include <common/macros.h>
27
28 LTTNG_HIDDEN
29 int parse_application_context(const char *str, char **out_provider_name,
30 char **out_ctx_name)
31 {
32 const char app_ctx_prefix[] = "$app.";
33 char *provider_name = NULL, *ctx_name = NULL;
34 size_t i, len, colon_pos = 0, provider_name_len, ctx_name_len;
35
36 if (!str || !out_provider_name || !out_ctx_name) {
37 goto not_found;
38 }
39
40 len = strlen(str);
41 if (len <= sizeof(app_ctx_prefix) - 1) {
42 goto not_found;
43 }
44
45 /* String starts with $app. */
46 if (strncmp(str, app_ctx_prefix, sizeof(app_ctx_prefix) - 1)) {
47 goto not_found;
48 }
49
50 /* Validate that the ':' separator is present. */
51 for (i = sizeof(app_ctx_prefix); i < len; i++) {
52 const char c = str[i];
53
54 if (c == ':') {
55 colon_pos = i;
56 break;
57 }
58 }
59
60 /*
61 * No colon found or no ctx name ("$app.provider:") or no provider name
62 * given ("$app.:..."), which is invalid.
63 */
64 if (!colon_pos || colon_pos == len ||
65 colon_pos == sizeof(app_ctx_prefix)) {
66 goto not_found;
67 }
68
69 provider_name_len = colon_pos - sizeof(app_ctx_prefix) + 2;
70 provider_name = zmalloc(provider_name_len);
71 if (!provider_name) {
72 PERROR("malloc provider_name");
73 goto not_found;
74 }
75 strncpy(provider_name, str + sizeof(app_ctx_prefix) - 1,
76 provider_name_len - 1);
77
78 ctx_name_len = len - colon_pos;
79 ctx_name = zmalloc(ctx_name_len);
80 if (!ctx_name) {
81 PERROR("malloc ctx_name");
82 goto not_found;
83 }
84 strncpy(ctx_name, str + colon_pos + 1, ctx_name_len - 1);
85
86 *out_provider_name = provider_name;
87 *out_ctx_name = ctx_name;
88 return 0;
89 not_found:
90 free(provider_name);
91 free(ctx_name);
92 return -1;
93 }
94
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