src/lib/parameters: Refactor common functions to an own file

Put all functions which are commont to flat build and protected kernel and
userspace to an own source file

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

src/lib/parameters/parameters_common.cpp

@@ -0,0 +1,137 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2012-2022 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.
+ *
+ ****************************************************************************/
+
+/**
+ * @file parameters_common.cpp
+ *
+ * Global parameter store, functions common to kernel and user sides
+ *
+ */
+
+static constexpr uint16_t param_info_count = sizeof(px4::parameters) / sizeof(param_info_s);
+
+/**
+ * Test whether a param_t is value.
+ *
+ * @param param			The parameter handle to test.
+ * @return			True if the handle is valid.
+ */
+static constexpr bool handle_in_range(param_t param) { return (param < param_info_count); }
+
+unsigned param_count()
+{
+	return param_info_count;
+}
+
+int param_get_index(param_t param)
+{
+	if (handle_in_range(param)) {
+		return (unsigned)param;
+	}
+
+	return -1;
+}
+
+param_t param_for_index(unsigned index)
+{
+	if (index < param_info_count) {
+		return (param_t)index;
+	}
+
+	return PARAM_INVALID;
+}
+
+const char *param_name(param_t param)
+{
+	return handle_in_range(param) ? px4::parameters[param].name : nullptr;
+}
+
+param_type_t param_type(param_t param)
+{
+	return handle_in_range(param) ? px4::parameters_type[param] : PARAM_TYPE_UNKNOWN;
+}
+
+bool param_is_volatile(param_t param)
+{
+	if (handle_in_range(param)) {
+		for (const auto &p : px4::parameters_volatile) {
+			if (static_cast<px4::params>(param) == p) {
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+size_t param_size(param_t param)
+{
+	if (handle_in_range(param)) {
+		switch (param_type(param)) {
+		case PARAM_TYPE_INT32:
+		case PARAM_TYPE_FLOAT:
+			return 4;
+
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}
+
+int
+param_get_system_default_value(param_t param, void *default_val)
+{
+	if (!handle_in_range(param)) {
+		return PX4_ERROR;
+	}
+
+	int ret = PX4_OK;
+
+	switch (param_type(param)) {
+	case PARAM_TYPE_INT32:
+		memcpy(default_val, &px4::parameters[param].val.i, param_size(param));
+		break;
+
+	case PARAM_TYPE_FLOAT:
+		memcpy(default_val, &px4::parameters[param].val.f, param_size(param));
+		break;
+
+	default:
+		ret = PX4_ERROR;
+		break;
+	}
+
+	return ret;
+}