X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Fcontext.cpp;fp=src%2Fcommon%2Fcontext.cpp;h=ab61a8133386b026bf27972a168030c74d9c401f;hb=a6bc4ca9d659caf016ef932fcd944029737ac57c;hp=0000000000000000000000000000000000000000;hpb=97535efaa975ca52bf02c2d5e76351bfd2e3defa;p=lttng-tools.git

diff --git a/src/common/context.cpp b/src/common/context.cpp
new file mode 100644
index 000000000..ab61a8133
--- /dev/null
+++ b/src/common/context.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#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 = (char *) 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 = (char *) 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;
+}
+