1 files changed, 136 insertions, 0 deletions
diff --git a/include/cdio/logging.h b/include/cdio/logging.h
new file mode 100644
index 00000000..988d11c5
--- /dev/null
+++ b/include/cdio/logging.h
@@ -0,0 +1,136 @@
+/*
+    $Id: logging.h,v 1.11 2008/03/25 15:59:09 karl Exp $
+
+    Copyright (C) 2003, 2004, 2008 Rocky Bernstein <rocky@gnu.org>
+    Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    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, see <http://www.gnu.org/licenses/>.
+*/
+
+/** \file logging.h 
+ *  \brief Header to control logging and level of detail of output.
+ *         
+ */
+
+#ifndef __LOGGING_H__
+#define __LOGGING_H__
+
+#include <cdio/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * The different log levels supported.
+ */
+typedef enum {
+  CDIO_LOG_DEBUG = 1, /**< Debug-level messages - helps debug what's up. */
+  CDIO_LOG_INFO,      /**< Informational - indicates perhaps something of 
+                           interest. */
+  CDIO_LOG_WARN,      /**< Warning conditions - something that looks funny. */
+  CDIO_LOG_ERROR,     /**< Error conditions - may terminate program.  */
+  CDIO_LOG_ASSERT     /**< Critical conditions - may abort program. */
+} cdio_log_level_t;
+
+/**
+ * The place to save the preference concerning how much verbosity 
+ * is desired. This is used by the internal default log handler, but
+ * it could be use by applications which provide their own log handler.
+ */
+extern cdio_log_level_t cdio_loglevel_default;
+
+/**
+ * This type defines the signature of a log handler.  For every
+ * message being logged, the handler will receive the log level and
+ * the message string.
+ *
+ * @see cdio_log_set_handler
+ * @see cdio_log_level_t
+ *
+ * @param level   The log level.
+ * @param message The log message.
+ */
+typedef void (*cdio_log_handler_t) (cdio_log_level_t level, 
+                                    const char message[]);
+
+/**
+ * Set a custom log handler for libcdio.  The return value is the log
+ * handler being replaced.  If the provided parameter is NULL, then
+ * the handler will be reset to the default handler.
+ *
+ * @see cdio_log_handler_t
+ *
+ * @param new_handler The new log handler.
+ * @return The previous log handler.
+ */
+cdio_log_handler_t cdio_log_set_handler (cdio_log_handler_t new_handler);
+
+/**
+ * Handle an message with the given log level.
+ *
+ * @see cdio_debug
+ * @see cdio_info
+ * @see cdio_warn
+ * @see cdio_error
+
+ * @param level   The log level.
+ * @param format  printf-style format string
+ * @param ...     remaining arguments needed by format string
+ */
+void cdio_log (cdio_log_level_t level, 
+               const char format[], ...) GNUC_PRINTF(2, 3);
+    
+/**
+ * Handle a debugging message.
+ *
+ * @see cdio_log for a more generic routine
+ */
+void cdio_debug (const char format[], ...) GNUC_PRINTF(1,2);
+
+/**
+ * Handle an informative message.
+ *
+ * @see cdio_log for a more generic routine
+ */
+void cdio_info (const char format[], ...) GNUC_PRINTF(1,2);
+
+/**
+ * Handle a warning message.
+ *
+ * @see cdio_log for a more generic routine
+ */
+void cdio_warn (const char format[], ...) GNUC_PRINTF(1,2);
+
+/**
+ * Handle an error message. Execution is terminated.
+ *
+ * @see cdio_log for a more generic routine.
+ */
+void cdio_error (const char format[], ...) GNUC_PRINTF(1,2);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LOGGING_H__ */
+
+
+/* 
+ * Local variables:
+ *  c-file-style: "gnu"
+ *  tab-width: 8
+ *  indent-tabs-mode: nil
+ * End:
+ */