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diff --git a/print.h b/print.h
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+/**
+ * Copyright (C) 2020  Evgeny Zinoviev
+ * This file is part of isv <https://github.com/gch1p/isv>.
+ *
+ * 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/>.
+ */
+
+#ifndef ISV_PRINT_H
+#define ISV_PRINT_H
+
+#include "p18.h"
+#include "variant.h"
+
+#define MAKE_PRINT_FN_NAME(msg_type)  print_ ## msg_type ## _msg
+#define PRINT_FN_NAME(msg_type)       MAKE_PRINT_FN_NAME(msg_type)
+
+#define PRINT_FN(msg_type) \
+     void PRINT_FN_NAME(msg_type)(const P18_MSG_T(msg_type) *m, print_format_t format)
+
+typedef enum {
+    PRINT_UNIT_V = 1,
+    PRINT_UNIT_A,
+    PRINT_UNIT_WH,
+    PRINT_UNIT_KWH,
+    PRINT_UNIT_VA,
+    PRINT_UNIT_HZ,
+    PRINT_UNIT_PERCENTAGE,
+    PRINT_UNIT_CELSIUS,
+} print_unit_t;
+
+typedef enum {
+    PRINT_FORMAT_TABLE,
+    PRINT_FORMAT_PARSABLE_TABLE,
+    PRINT_FORMAT_JSON,
+    PRINT_FORMAT_JSON_W_UNITS,
+} print_format_t;
+
+typedef struct {
+    char *key;
+    char *title;
+    variant_t value;
+    short precision;
+    print_unit_t unit;
+} print_item_t;
+
+void print_json(print_item_t *items, size_t size, bool with_units);
+void print_set_result(bool success, print_format_t format);
+bool print_is_json_format(print_format_t f);
+
+PRINT_FN(protocol_id);
+PRINT_FN(current_time);
+PRINT_FN(total_generated);
+PRINT_FN(year_generated);
+PRINT_FN(month_generated);
+PRINT_FN(day_generated);
+PRINT_FN(series_number);
+PRINT_FN(cpu_version);
+PRINT_FN(rated_information);
+PRINT_FN(general_status);
+PRINT_FN(working_mode);
+PRINT_FN(faults_warnings);
+PRINT_FN(flags_statuses);
+PRINT_FN(defaults);
+PRINT_FN(max_charging_current_selectable_values);
+PRINT_FN(max_ac_charging_current_selectable_values);
+PRINT_FN(parallel_rated_information);
+PRINT_FN(parallel_general_status);
+PRINT_FN(ac_charge_time_bucket);
+PRINT_FN(ac_supply_load_time_bucket);
+
+#endif //ISV_PRINT_H