conf: add configuration subsystem

The conf-subsystem is used throughout the whole source and provides a
global static read-only configuration. The configuration is read on
startup from the command-line and filesystem and then provided to the
other subsystems.

This is no database, that is, the data is not written to a file on
shutdown!

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/conf.h b/src/conf.h
new file mode 100644
index 0000000..d2b36da
--- /dev/null
+++ b/src/conf.h
@@ -0,0 +1,58 @@
+/*
+ * App Configuration
+ *
+ * Copyright (c) 2012 David Herrmann <dh.herrmann@googlemail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Configuration
+ * This file provides a static global configuration. Several functions are
+ * available which parse external data like command-line options or
+ * configuration-files into the global configuration "conf_global".
+ * All subsystems can add their parsers and values here so the single
+ * configuration object will be sufficient to configure the whole application.
+ *
+ * The data is static and should be considered read-only. Only on startup the
+ * configuration is written, all later functions should only read it. This is no
+ * database so there is no reason to write the config again.
+ */
+
+#ifndef CONFIG_CONFIG_H
+#define CONFIG_CONFIG_H
+
+#include <stdlib.h>
+#include <unistd.h>
+
+struct conf_obj {
+	/* exit application after parsing options */
+	int exit;
+	/* enable debug messages */
+	int debug;
+	/* enable verbose info messages */
+	int verbose;
+};
+
+extern struct conf_obj conf_global;
+
+int conf_parse_argv(int argc, char **argv);
+
+#endif /* CONFIG_CONFIG_H */