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Code Issues Releases Wiki Activity

[modbus_controller] Use stack buffers instead of heap-allocating string helpers (#13221)

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
This commit is contained in:
J. Nick Koston
2026-01-17 17:26:51 -10:00
committed by GitHub
parent 728236270c
commit 21794e28e5
2 changed files with 23 additions and 8 deletions
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15
esphome/components/modbus_controller/modbus_controller.h
View File

@@ -271,24 +271,31 @@ class ServerRegister {
// Formats a raw value into a string representation based on the value type for debugging
std::string format_value(int64_t value) const {
// max 44: float with %.1f can be up to 42 chars (3.4e38 → 39 integer digits + sign + decimal + 1 digit)
// plus null terminator = 43, rounded to 44 for 4-byte alignment
char buf[44];
switch (this->value_type) {
case SensorValueType::U_WORD:
case SensorValueType::U_DWORD:
case SensorValueType::U_DWORD_R:
case SensorValueType::U_QWORD:
case SensorValueType::U_QWORD_R:
return std::to_string(static_cast<uint64_t>(value));
buf_append_printf(buf, sizeof(buf), 0, "%" PRIu64, static_cast<uint64_t>(value));
return buf;
case SensorValueType::S_WORD:
case SensorValueType::S_DWORD:
case SensorValueType::S_DWORD_R:
case SensorValueType::S_QWORD:
case SensorValueType::S_QWORD_R:
return std::to_string(value);
buf_append_printf(buf, sizeof(buf), 0, "%" PRId64, value);
return buf;
case SensorValueType::FP32_R:
case SensorValueType::FP32:
return str_sprintf("%.1f", bit_cast<float>(static_cast<uint32_t>(value)));
buf_append_printf(buf, sizeof(buf), 0, "%.1f", bit_cast<float>(static_cast<uint32_t>(value)));
return buf;
default:
return std::to_string(value);
buf_append_printf(buf, sizeof(buf), 0, "%" PRId64, value);
return buf;
}
}

16
esphome/components/modbus_controller/text_sensor/modbus_textsensor.cpp
View File

@@ -16,12 +16,20 @@ void ModbusTextSensor::parse_and_publish(const std::vector<uint8_t> &data) {
while ((items_left > 0) && index < data.size()) {
uint8_t b = data[index];
switch (this->encode_) {
case RawEncoding::HEXBYTES:
output_str += str_snprintf("%02x", 2, b);
case RawEncoding::HEXBYTES: {
// max 3: 2 hex digits + null
char hex_buf[3];
snprintf(hex_buf, sizeof(hex_buf), "%02x", b);
output_str += hex_buf;
break;
case RawEncoding::COMMA:
output_str += str_sprintf(index != this->offset ? ",%d" : "%d", b);
}
case RawEncoding::COMMA: {
// max 5: optional ','(1) + uint8(3) + null, for both ",%d" and "%d"
char dec_buf[5];
snprintf(dec_buf, sizeof(dec_buf), index != this->offset ? ",%d" : "%d", b);
output_str += dec_buf;
break;
}
case RawEncoding::ANSI:
if (b < 0x20)
break;