+/*
+ * context.c
+ *
+ * LTTng context utilities.
+ *
+ * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "context.h"
+#include <stddef.h>
+#include <string.h>
+#include <common/error.h>
+#include <common/macros.h>
+
+int parse_application_context(const char *str, char **out_provider_name,
+ char **out_ctx_name)
+{
+ const char app_ctx_prefix[] = "$app.";
+ char *provider_name = NULL, *ctx_name = NULL;
+ size_t i, len, colon_pos = 0, provider_name_len, ctx_name_len;
+
+ if (!str || !out_provider_name || !out_ctx_name) {
+ goto not_found;
+ }
+
+ len = strlen(str);
+ if (len <= sizeof(app_ctx_prefix) - 1) {
+ goto not_found;
+ }
+
+ /* String starts with $app. */
+ if (strncmp(str, app_ctx_prefix, sizeof(app_ctx_prefix) - 1)) {
+ goto not_found;
+ }
+
+ /* Validate that the ':' separator is present. */
+ for (i = sizeof(app_ctx_prefix); i < len; i++) {
+ const char c = str[i];
+
+ if (c == ':') {
+ colon_pos = i;
+ break;
+ }
+ }
+
+ /*
+ * No colon found or no ctx name ("$app.provider:") or no provider name
+ * given ("$app.:..."), which is invalid.
+ */
+ if (!colon_pos || colon_pos == len ||
+ colon_pos == sizeof(app_ctx_prefix)) {
+ goto not_found;
+ }
+
+ provider_name_len = colon_pos - sizeof(app_ctx_prefix) + 2;
+ provider_name = zmalloc(provider_name_len);
+ if (!provider_name) {
+ PERROR("malloc provider_name");
+ goto not_found;
+ }
+ strncpy(provider_name, str + sizeof(app_ctx_prefix) - 1,
+ provider_name_len - 1);
+
+ ctx_name_len = len - colon_pos;
+ ctx_name = zmalloc(ctx_name_len);
+ if (!ctx_name) {
+ PERROR("malloc ctx_name");
+ goto not_found;
+ }
+ strncpy(ctx_name, str + colon_pos + 1, ctx_name_len - 1);
+
+ *out_provider_name = provider_name;
+ *out_ctx_name = ctx_name;
+ return 0;
+not_found:
+ free(provider_name);
+ free(ctx_name);
+ return -1;
+}
+