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config.c
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config.c
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#include "config.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#define _SVID_SOURCE
#include <string.h>
#include "cJSON/cJSON.h"
int getParameter(cJSON* json, CONFIG* cfg);
int getMqttParameter(const cJSON* mqtt, CONFIG* cfg);
int getHomeassistantParameter(const cJSON* hass, CONFIG* cfg);
int parseConfig(const char* file, CONFIG* cfg)
{
int status = 0;
FILE *fp = fopen(file, "rt");
if (fp == NULL)
{
printf("Error opening config file: %s\n", file);
return 8;
}
fseek (fp, 0, SEEK_END);
int fileLength = ftell(fp);
fseek(fp, 0, SEEK_SET);
char *config = malloc(fileLength + 1);
fread(config, 1, fileLength, fp);
config[fileLength] = '\0';
fclose(fp);
cJSON *json = cJSON_Parse(config);
if (json == NULL)
{
const char *error_ptr = cJSON_GetErrorPtr();
if (error_ptr != NULL)
{
fprintf(stderr, "Error before: %s\n", error_ptr);
}
status = 9;
goto end;
}
status = getParameter(json, cfg);
if (status != 0) {
goto end;
}
const cJSON* mqtt = cJSON_GetObjectItem(json, "mqtt");
if (mqtt == NULL || !cJSON_IsObject(mqtt)) {
printf("Invalid value for mqtt\n");
status = 11;
goto end;
}
status = getMqttParameter(mqtt, cfg);
if (status != 0) {
goto end;
}
const cJSON* hass = cJSON_GetObjectItem(json, "homeassistant");
if (hass == NULL || !cJSON_IsObject(hass)) {
printf("Invalid value for homeassistant\n");
status = 11;
goto end;
}
status = getHomeassistantParameter(hass, cfg);
end:
cJSON_Delete(json);
free(config);
return status;
}
int getParameter(cJSON* json, CONFIG* cfg)
{
cJSON *value;
// Serial port
value = cJSON_GetObjectItem(json, "device");
if (value == NULL || !cJSON_IsString(value))
{
printf("Invalid value for device\n");
return 10;
}
cfg->serial_port = strdup(value->valuestring);
// reset vbus (via serial device)
value = cJSON_GetObjectItem(json, "reset_vbus");
if (value != NULL && value->valuestring != NULL) {
if (!cJSON_IsString(value))
{
printf("Invalid value for reset_vbus\n");
return 10;
}
cfg->reset_vbus = strdup(value->valuestring);
}
// Database path
value = cJSON_GetObjectItem(json, "database");
if (value != NULL && value->valuestring != NULL) {
if (!cJSON_IsString(value))
{
printf("Invalid value for database\n");
return 10;
}
cfg->database = strdup(value->valuestring);
}
// Interval
value = cJSON_GetObjectItem(json, "interval");
if (value == NULL || !cJSON_IsNumber(value))
{
printf("Invalid value for interval\n");
return 10;
}
cfg->delay = value->valueint;
// Verbose mode
value = cJSON_GetObjectItem(json, "verbose");
if (value == NULL || !cJSON_IsBool(value))
{
printf("Invalid value for verbose\n");
return 10;
}
cfg->verbose = value->valueint != 0;
// Print to stdout
value = cJSON_GetObjectItem(json, "print_stdout");
if (value == NULL || !cJSON_IsBool(value))
{
printf("Invalid value for print_stdout\n");
return 10;
}
cfg->print_result = value->valueint != 0;
return 0;
}
int getMqttParameter(const cJSON* mqtt, CONFIG* cfg)
{
cJSON *value;
// Enabled
value = cJSON_GetObjectItem(mqtt, "enabled");
if (value == NULL || !cJSON_IsBool(value))
{
printf("Invalid value for mqtt.enabled\n");
return 10;
}
cfg->mqtt_enabled = value->valueint != 0;
if (cfg->mqtt_enabled == 0) {
return 0;
}
// MQTT server
value = cJSON_GetObjectItem(mqtt, "server");
if (value == NULL || !cJSON_IsString(value))
{
printf("Invalid value for mqtt.server\n");
return 10;
}
cfg->mqtt_server = strdup(value->valuestring);
// MQTT client_id
value = cJSON_GetObjectItem(mqtt, "client_id");
if (value == NULL || !cJSON_IsString(value))
{
printf("Invalid value for mqtt.client_id\n");
return 10;
}
cfg->mqtt_client_id = strdup(value->valuestring);
// MQTT user
value = cJSON_GetObjectItem(mqtt, "user");
if (value != NULL && value->valuestring != NULL) {
if (!cJSON_IsString(value))
{
printf("Invalid value for mqtt.user\n");
return 10;
}
cfg->mqtt_user = strdup(value->valuestring);
}
// MQTT password
value = cJSON_GetObjectItem(mqtt, "password");
if (value != NULL && value->valuestring != NULL) {
if (!cJSON_IsString(value))
{
printf("Invalid value for mqtt.password\n");
return 10;
}
cfg->mqtt_password = strdup(value->valuestring);
}
// MQTT base_topic
value = cJSON_GetObjectItem(mqtt, "base_topic");
if (value == NULL || !cJSON_IsString(value))
{
printf("Invalid value for mqtt.base_topic\n");
return 10;
}
cfg->mqtt_base_topic = strdup(value->valuestring);
return 0;
}
int getHomeassistantParameter(const cJSON* hass, CONFIG* cfg)
{
cJSON *value;
// Enabled
value = cJSON_GetObjectItem(hass, "enabled");
if (value == NULL || !cJSON_IsBool(value))
{
printf("Invalid value for homeassistant.enabled\n");
return 10;
}
cfg->homeassistant_enabled = value->valueint != 0;
if (!cfg->homeassistant_enabled) {
return 0;
}
// Entity ID
value = cJSON_GetObjectItem(hass, "entity_id_base");
if (value == NULL || !cJSON_IsString(value))
{
printf("Invalid value for homeassistant.entity_id_base\n");
return 10;
}
cfg->homeassistant_entity_id_base = strdup(value->valuestring);
return 0;
}