From 48f0e52f9d6194cc2220f61c0c314091251f5d19 Mon Sep 17 00:00:00 2001 From: "J. Nick Koston" Date: Sun, 23 Nov 2025 21:20:23 -0600 Subject: [PATCH] one more --- esphome/core/application.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/esphome/core/application.h b/esphome/core/application.h index dae44d8902..14e800342e 100644 --- a/esphome/core/application.h +++ b/esphome/core/application.h @@ -105,11 +105,13 @@ class Application { arch_init(); this->name_add_mac_suffix_ = name_add_mac_suffix; if (name_add_mac_suffix) { + // MAC address length: 12 hex chars + null terminator + constexpr size_t mac_address_len = 13; // MAC address suffix length (last 6 characters of 12-char MAC address string) constexpr size_t mac_address_suffix_len = 6; - const std::string mac_addr = get_mac_address(); - // Use pointer + offset to avoid substr() allocation - const char *mac_suffix_ptr = mac_addr.c_str() + mac_address_suffix_len; + char mac_addr[mac_address_len]; + get_mac_address_into_buffer(mac_addr); + const char *mac_suffix_ptr = mac_addr + mac_address_suffix_len; this->name_ = make_name_with_suffix(name, '-', mac_suffix_ptr, mac_address_suffix_len); if (!friendly_name.empty()) { this->friendly_name_ = make_name_with_suffix(friendly_name, ' ', mac_suffix_ptr, mac_address_suffix_len);