refactor logger: move some independent methods into separate util file

src/modules/logger/util.h

@@ -0,0 +1,89 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2018 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#pragma once
+
+#include <stdint.h>
+#include <time.h>
+
+#include <uORB/uORB.h>
+
+#ifdef __PX4_NUTTX
+#define LOG_DIR_LEN 64
+#else
+#define LOG_DIR_LEN 256
+#endif
+
+namespace px4
+{
+namespace logger
+{
+namespace util
+{
+
+/**
+ * Recursively remove a directory
+ * @return 0 on success, <0 otherwise
+ */
+int remove_directory(const char *dir);
+
+/**
+ * check if a file exists
+ */
+bool file_exist(const char *filename);
+
+/**
+ * Check if there is enough free space left on the SD Card.
+ * It will remove old log files if there is not enough space,
+ * and if that fails return 1, and send a user message
+ * @param log_root_dir log root directory: it's expected to contain directories in the form of sess%i or %d-%d-%d (year, month, day)
+ * @param max_log_dirs_to_keep maximum log directories to keep (set to 0 for unlimited)
+ * @param mavlink_log_pub
+ * @param sess_dir_index output argument: will be set to the next free directory sess%i index.
+ * @return 0 on success, 1 if not enough space, <0 on error
+ */
+int check_free_space(const char *log_root_dir, int32_t max_log_dirs_to_keep, orb_advert_t &mavlink_log_pub,
+		     int &sess_dir_index);
+
+/**
+ * Get the time for log file name
+ * @param tt returned time
+ * @param utc_offset_sec UTC time offset [s]
+ * @param boot_time use time when booted instead of current time
+ * @return true on success, false otherwise (eg. if no gps)
+ */
+bool get_log_time(struct tm *tt, int utc_offset_sec = 0, bool boot_time = false);
+
+} //namespace util
+} //namespace logger
+} //namespace px4