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Introduce str_snprintf helper function (#2780)

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Oxan van Leeuwen 2021-11-23 08:30:49 +01:00 committed by GitHub
parent 1424091ee5
commit 897277992b
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 3 deletions
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18
esphome/core/helpers.cpp
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@ -48,13 +48,13 @@ void get_mac_address_raw(uint8_t *mac) {
std::string get_mac_address() {
uint8_t mac[6];
get_mac_address_raw(mac);
return str_sprintf("%02x%02x%02x%02x%02x%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
return str_snprintf("%02x%02x%02x%02x%02x%02x", 12, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}
std::string get_mac_address_pretty() {
uint8_t mac[6];
get_mac_address_raw(mac);
return str_sprintf("%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
return str_snprintf("%02X:%02X:%02X:%02X:%02X:%02X", 17, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}
#ifdef USE_ESP32
@ -325,6 +325,20 @@ bool str_startswith(const std::string &full, const std::string &start) { return
bool str_endswith(const std::string &full, const std::string &ending) {
return full.rfind(ending) == (full.size() - ending.size());
}
std::string str_snprintf(const char *fmt, size_t length, ...) {
std::string str;
va_list args;
str.resize(length);
va_start(args, length);
size_t out_length = vsnprintf(&str[0], length + 1, fmt, args);
va_end(args);
if (out_length < length)
str.resize(out_length);
return str;
}
std::string str_sprintf(const char *fmt, ...) {
std::string str;
va_list args;

5
esphome/core/helpers.h
View file

@ -57,7 +57,10 @@ bool str_equals_case_insensitive(const std::string &a, const std::string &b);
bool str_startswith(const std::string &full, const std::string &start);
bool str_endswith(const std::string &full, const std::string &ending);
/// sprintf-like function returning std::string instead of writing to char array.
/// snprintf-like function returning std::string with a given maximum length.
std::string __attribute__((format(printf, 1, 3))) str_snprintf(const char *fmt, size_t length, ...);
/// sprintf-like function returning std::string.
std::string __attribute__((format(printf, 1, 2))) str_sprintf(const char *fmt, ...);
class HighFrequencyLoopRequester {