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Code Issues Releases Wiki Activity

[wiegand] Replace heap-allocating to_string with stack buffers (#13294)

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This commit is contained in:
J. Nick Koston
2026-01-18 18:37:14 -10:00
committed by GitHub
parent 052b05df56
commit 5b92d0b89e
1 changed files with 13 additions and 9 deletions
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22
esphome/components/wiegand/wiegand.cpp
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@@ -1,4 +1,5 @@
#include "wiegand.h"
#include <cinttypes>
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
@@ -69,32 +70,35 @@ void Wiegand::loop() {
for (auto *trigger : this->raw_triggers_)
trigger->trigger(count, value);
if (count == 26) {
std::string tag = to_string((value >> 1) & 0xffffff);
ESP_LOGD(TAG, "received 26-bit tag: %s", tag.c_str());
char tag_buf[12]; // max 8 digits for 24-bit value + null
buf_append_printf(tag_buf, sizeof(tag_buf), 0, "%" PRIu32, static_cast<uint32_t>((value >> 1) & 0xffffff));
ESP_LOGD(TAG, "received 26-bit tag: %s", tag_buf);
if (!check_eparity(value, 13, 13) || !check_oparity(value, 0, 13)) {
ESP_LOGW(TAG, "invalid parity");
return;
}
for (auto *trigger : this->tag_triggers_)
trigger->trigger(tag);
trigger->trigger(tag_buf);
} else if (count == 34) {
std::string tag = to_string((value >> 1) & 0xffffffff);
ESP_LOGD(TAG, "received 34-bit tag: %s", tag.c_str());
char tag_buf[12]; // max 10 digits for 32-bit value + null
buf_append_printf(tag_buf, sizeof(tag_buf), 0, "%" PRIu32, static_cast<uint32_t>((value >> 1) & 0xffffffff));
ESP_LOGD(TAG, "received 34-bit tag: %s", tag_buf);
if (!check_eparity(value, 17, 17) || !check_oparity(value, 0, 17)) {
ESP_LOGW(TAG, "invalid parity");
return;
}
for (auto *trigger : this->tag_triggers_)
trigger->trigger(tag);
trigger->trigger(tag_buf);
} else if (count == 37) {
std::string tag = to_string((value >> 1) & 0x7ffffffff);
ESP_LOGD(TAG, "received 37-bit tag: %s", tag.c_str());
char tag_buf[12]; // max 11 digits for 35-bit value + null
buf_append_printf(tag_buf, sizeof(tag_buf), 0, "%" PRIu64, static_cast<uint64_t>((value >> 1) & 0x7ffffffff));
ESP_LOGD(TAG, "received 37-bit tag: %s", tag_buf);
if (!check_eparity(value, 18, 19) || !check_oparity(value, 0, 19)) {
ESP_LOGW(TAG, "invalid parity");
return;
}
for (auto *trigger : this->tag_triggers_)
trigger->trigger(tag);
trigger->trigger(tag_buf);
} else if (count == 4) {
for (auto *trigger : this->key_triggers_)
trigger->trigger(value);