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[core] Optimize MAC address formatting to eliminate sprintf dependency (#10713)

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This commit is contained in:
J. Nick Koston
2025-09-14 16:50:38 -05:00
committed by GitHub
parent 10a665b864
commit 9c85a7eff3
3 changed files with 40 additions and 8 deletions
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29
esphome/core/helpers.h
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@@ -380,6 +380,35 @@ template<typename T, enable_if_t<std::is_unsigned<T>::value, int> = 0> optional<
return parse_hex<T>(str.c_str(), str.length());
}
/// Convert a nibble (0-15) to lowercase hex char
inline char format_hex_char(uint8_t v) { return v >= 10 ? 'a' + (v - 10) : '0' + v; }
/// Convert a nibble (0-15) to uppercase hex char (used for pretty printing)
/// This always uses uppercase (A-F) for pretty/human-readable output
inline char format_hex_pretty_char(uint8_t v) { return v >= 10 ? 'A' + (v - 10) : '0' + v; }
/// Format MAC address as XX:XX:XX:XX:XX:XX (uppercase)
inline void format_mac_addr_upper(const uint8_t *mac, char *output) {
for (size_t i = 0; i < 6; i++) {
uint8_t byte = mac[i];
output[i * 3] = format_hex_pretty_char(byte >> 4);
output[i * 3 + 1] = format_hex_pretty_char(byte & 0x0F);
if (i < 5)
output[i * 3 + 2] = ':';
}
output[17] = '\0';
}
/// Format MAC address as xxxxxxxxxxxxxx (lowercase, no separators)
inline void format_mac_addr_lower_no_sep(const uint8_t *mac, char *output) {
for (size_t i = 0; i < 6; i++) {
uint8_t byte = mac[i];
output[i * 2] = format_hex_char(byte >> 4);
output[i * 2 + 1] = format_hex_char(byte & 0x0F);
}
output[12] = '\0';
}
/// Format the six-byte array \p mac into a MAC address.
std::string format_mac_address_pretty(const uint8_t mac[6]);
/// Format the byte array \p data of length \p len in lowercased hex.