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[sml] Eliminate heap allocations in text sensor (#13039)

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This commit is contained in:
J. Nick Koston
2026-01-06 17:51:26 -10:00
committed by GitHub
parent 68b4bc9d9e
commit 4391457a96
1 changed files with 16 additions and 4 deletions
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20
esphome/components/sml/text_sensor/sml_text_sensor.cpp
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@@ -2,6 +2,7 @@
#include "esphome/core/log.h"
#include "sml_text_sensor.h"
#include "../sml_parser.h"
#include <cinttypes>
namespace esphome {
namespace sml {
@@ -21,22 +22,33 @@ void SmlTextSensor::publish_val(const ObisInfo &obis_info) {
switch (value_type) {
case SML_HEX: {
publish_state("0x" + bytes_repr(obis_info.value));
// Buffer for "0x" + up to 32 bytes as hex + null
char buf[67];
buf[0] = '0';
buf[1] = 'x';
// Max 32 bytes of data fit in remaining buffer ((65-1)/2)
size_t hex_bytes = std::min(obis_info.value.size(), size_t(32));
format_hex_to(buf + 2, sizeof(buf) - 2, obis_info.value.begin(), hex_bytes);
publish_state(buf, 2 + hex_bytes * 2);
break;
}
case SML_INT: {
publish_state(to_string(bytes_to_int(obis_info.value)));
char buf[21]; // Enough for int64_t (-9223372036854775808)
int len = snprintf(buf, sizeof(buf), "%" PRId64, bytes_to_int(obis_info.value));
publish_state(buf, static_cast<size_t>(len));
break;
}
case SML_BOOL:
publish_state(bytes_to_uint(obis_info.value) ? "True" : "False");
break;
case SML_UINT: {
publish_state(to_string(bytes_to_uint(obis_info.value)));
char buf[21]; // Enough for uint64_t (18446744073709551615)
int len = snprintf(buf, sizeof(buf), "%" PRIu64, bytes_to_uint(obis_info.value));
publish_state(buf, static_cast<size_t>(len));
break;
}
case SML_OCTET: {
publish_state(std::string(obis_info.value.begin(), obis_info.value.end()));
publish_state(reinterpret_cast<const char *>(obis_info.value.begin()), obis_info.value.size());
break;
}
}