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optimize memory allocation for battery percentage template

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This commit is contained in:
Nicu Hodos 2025-10-05 13:03:12 +02:00
parent 57b9494c98
commit 3dc31ff585
1 changed files with 4 additions and 2 deletions
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6
include/rc_devices.h
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@ -76,9 +76,11 @@ VoltageSensor* createVoltageSensor(const char* id) {
return new VoltageSensor{id, "Battery voltage", "{{ value_json.sensor.diagnostic.voltage }}"}; return new VoltageSensor{id, "Battery voltage", "{{ value_json.sensor.diagnostic.voltage }}"};
} }
#define BATTERY_PERCENTAGE_TEMPLATE "{{ ((value_json.sensor.diagnostic.voltage|float-%.2f)|round(2)*100/%.2f)|int }}"
BatterySensor* createBatterySensor(const char* id, float min, float max) { BatterySensor* createBatterySensor(const char* id, float min, float max) {
char* value_json = new char[128]; auto len = snprintf(nullptr, 0, BATTERY_PERCENTAGE_TEMPLATE, min, max - min) + 1;
snprintf(value_json, 128, "{{ ((value_json.sensor.diagnostic.voltage|float-%.2f)|round(2)*100/%.2f)|int }}", min, max - min); char* value_json = new char[len];
snprintf(value_json, len, BATTERY_PERCENTAGE_TEMPLATE, min, max - min);
return new BatterySensor{id, "Battery level", value_json}; return new BatterySensor{id, "Battery level", value_json};
} }