[voice_assistant] Eliminate substr() allocations in text truncation

2025-11-05 09:31:54 +00:00 · 2025-11-04 22:20:55 -06:00
1 changed files with 4 additions and 2 deletions
--- a/esphome/components/voice_assistant/voice_assistant.cpp
+++ b/esphome/components/voice_assistant/voice_assistant.cpp
@@ -657,7 +657,8 @@ void VoiceAssistant::on_event(const api::VoiceAssistantEventResponse &msg) {
        ESP_LOGW(TAG, "No text in STT_END event");
        return;
      } else if (text.length() > 500) {
-        text = text.substr(0, 497) + "...";
+        text.resize(497);
+        text += "...";
      }
      ESP_LOGD(TAG, "Speech recognised as: \"%s\"", text.c_str());
      this->defer([this, text]() { this->stt_end_trigger_->trigger(text); });
@@ -714,7 +715,8 @@ void VoiceAssistant::on_event(const api::VoiceAssistantEventResponse &msg) {
        return;
      }
      if (text.length() > 500) {
-        text = text.substr(0, 497) + "...";
+        text.resize(497);
+        text += "...";
      }
      ESP_LOGD(TAG, "Response: \"%s\"", text.c_str());
      this->defer([this, text]() {