Add libconfig implementation and tests

[lttng-tools.git] / src / common / config / config.h

diff --git a/src/common/config/config.h b/src/common/config/config.h
new file mode 100644 (file)
index 0000000..73e39fc
--- /dev/null
+++ b/src/common/config/config.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+
+#include <common/config/ini.h>
+#include <common/macros.h>
+
+struct config_entry {
+       /* section is NULL if the entry is not in a section */
+       const char *section;
+       const char *name;
+       const char *value;
+};
+
+/*
+ * A config_entry_handler_cb receives config_entry structures belonging to the
+ * sections the handler has been registered to.
+ *
+ * The config_entry and its members are only valid for the duration of the call
+ * and must not be freed.
+ *
+ * config_entry_handler_cb may return negative value to indicate an error in
+ * the configuration file.
+ */
+typedef int (*config_entry_handler_cb)(const struct config_entry *, void *);
+
+/*
+ * Read a section's entries in an INI configuration file.
+ *
+ * path may be NULL, in which case the following paths will be tried:
+ *     1) $HOME/.lttng/lttng.conf
+ *     2) /etc/lttng/lttng.conf
+ *
+ * handler will only be called with entries belonging to the provided section.
+ * If section is NULL, all entries will be relayed to handler. If section is
+ * "", only the global entries are relayed.
+ *
+ * Returns 0 on success. Negative values are error codes. If the return value
+ * is positive, it represents the line number on which a parsing error occured.
+ */
+LTTNG_HIDDEN
+int config_get_section_entries(const char *path, const char *section,
+               config_entry_handler_cb handler, void *user_data);
+
+/*
+ * Parse a configuration value.
+ *
+ * This function expects either an unsigned integer or a boolean text option.
+ * The following strings are recognized: true, yes, on, false, no and off.
+ *
+ * Returns either the value of the parsed integer, or 0/1 if a boolean text
+ * string was recognized. Negative values indicate an error.
+ */
+LTTNG_HIDDEN
+int config_parse_value(const char *value);
+
+#endif /* _CONFIG_H */