diff --git a/esphome/components/audio/__init__.py b/esphome/components/audio/__init__.py index 8f2102de6a..fee582ca25 100644 --- a/esphome/components/audio/__init__.py +++ b/esphome/components/audio/__init__.py @@ -1,7 +1,11 @@ from dataclasses import dataclass import esphome.codegen as cg -from esphome.components.esp32 import add_idf_component, include_builtin_idf_component +from esphome.components.esp32 import ( + add_idf_component, + add_idf_sdkconfig_option, + include_builtin_idf_component, +) import esphome.config_validation as cv from esphome.const import CONF_BITS_PER_SAMPLE, CONF_NUM_CHANNELS, CONF_SAMPLE_RATE from esphome.core import CORE @@ -27,6 +31,7 @@ class AudioData: flac_support: bool = False mp3_support: bool = False opus_support: bool = False + micro_decoder_support: bool = False def _get_data() -> AudioData: @@ -50,6 +55,11 @@ def request_opus_support() -> None: _get_data().opus_support = True +def request_micro_decoder_support() -> None: + """Request micro-decoder library support for audio decoding.""" + _get_data().micro_decoder_support = True + + CONF_MIN_BITS_PER_SAMPLE = "min_bits_per_sample" CONF_MAX_BITS_PER_SAMPLE = "max_bits_per_sample" CONF_MIN_CHANNELS = "min_channels" @@ -208,6 +218,19 @@ async def to_code(config): ) data = _get_data() + + if data.micro_decoder_support: + add_idf_component(name="esphome/micro-decoder", ref="0.1.1") + + # All codecs are enabled by default in micro-decoder, so disable the ones that aren't requested to save flash + if not data.flac_support: + add_idf_sdkconfig_option("CONFIG_MICRO_DECODER_CODEC_FLAC", False) + if not data.mp3_support: + add_idf_sdkconfig_option("CONFIG_MICRO_DECODER_CODEC_MP3", False) + if not data.opus_support: + add_idf_sdkconfig_option("CONFIG_MICRO_DECODER_CODEC_OPUS", False) + + # Legacy audio_decoder.cpp support defines and components if data.flac_support: cg.add_define("USE_AUDIO_FLAC_SUPPORT") add_idf_component(name="esphome/micro-flac", ref="0.1.1") diff --git a/esphome/components/esp32/preferences.cpp b/esphome/components/esp32/preferences.cpp index bc0a34ebe8..925c4e7662 100644 --- a/esphome/components/esp32/preferences.cpp +++ b/esphome/components/esp32/preferences.cpp @@ -4,7 +4,6 @@ #include "esphome/core/helpers.h" #include "esphome/core/log.h" #include -#include #include #include @@ -12,9 +11,6 @@ namespace esphome::esp32 { static const char *const TAG = "preferences"; -// Buffer size for converting uint32_t to string: max "4294967295" (10 chars) + null terminator + 1 padding -static constexpr size_t KEY_BUFFER_SIZE = 12; - struct NVSData { uint32_t key; SmallInlineBuffer<8> data; // Most prefs fit in 8 bytes (covers fan, cover, select, etc.) @@ -51,8 +47,8 @@ bool ESP32PreferenceBackend::load(uint8_t *data, size_t len) { } } - char key_str[KEY_BUFFER_SIZE]; - snprintf(key_str, sizeof(key_str), "%" PRIu32, this->key); + char key_str[UINT32_MAX_STR_SIZE]; + uint32_to_str(key_str, this->key); size_t actual_len; esp_err_t err = nvs_get_blob(this->nvs_handle, key_str, nullptr, &actual_len); if (err != 0) { @@ -108,8 +104,8 @@ bool ESP32Preferences::sync() { uint32_t last_key = 0; for (const auto &save : s_pending_save) { - char key_str[KEY_BUFFER_SIZE]; - snprintf(key_str, sizeof(key_str), "%" PRIu32, save.key); + char key_str[UINT32_MAX_STR_SIZE]; + uint32_to_str(key_str, save.key); ESP_LOGVV(TAG, "Checking if NVS data %s has changed", key_str); if (this->is_changed_(this->nvs_handle, save, key_str)) { esp_err_t err = nvs_set_blob(this->nvs_handle, key_str, save.data.data(), save.data.size()); diff --git a/esphome/components/libretiny/preferences.cpp b/esphome/components/libretiny/preferences.cpp index fba6717294..313b36d31e 100644 --- a/esphome/components/libretiny/preferences.cpp +++ b/esphome/components/libretiny/preferences.cpp @@ -3,7 +3,6 @@ #include "preferences.h" #include "esphome/core/helpers.h" #include "esphome/core/log.h" -#include #include #include @@ -11,9 +10,6 @@ namespace esphome::libretiny { static const char *const TAG = "preferences"; -// Buffer size for converting uint32_t to string: max "4294967295" (10 chars) + null terminator + 1 padding -static constexpr size_t KEY_BUFFER_SIZE = 12; - struct NVSData { uint32_t key; SmallInlineBuffer<8> data; // Most prefs fit in 8 bytes (covers fan, cover, select, etc.) @@ -50,8 +46,8 @@ bool LibreTinyPreferenceBackend::load(uint8_t *data, size_t len) { } } - char key_str[KEY_BUFFER_SIZE]; - snprintf(key_str, sizeof(key_str), "%" PRIu32, this->key); + char key_str[UINT32_MAX_STR_SIZE]; + uint32_to_str(key_str, this->key); fdb_blob_make(this->blob, data, len); size_t actual_len = fdb_kv_get_blob(this->db, key_str, this->blob); if (actual_len != len) { @@ -92,8 +88,8 @@ bool LibreTinyPreferences::sync() { uint32_t last_key = 0; for (const auto &save : s_pending_save) { - char key_str[KEY_BUFFER_SIZE]; - snprintf(key_str, sizeof(key_str), "%" PRIu32, save.key); + char key_str[UINT32_MAX_STR_SIZE]; + uint32_to_str(key_str, save.key); ESP_LOGVV(TAG, "Checking if FDB data %s has changed", key_str); if (this->is_changed_(&this->db, save, key_str)) { ESP_LOGV(TAG, "sync: key: %s, len: %zu", key_str, save.data.size()); diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp index cbe22dd09a..f7bc6c5bee 100644 --- a/esphome/core/helpers.cpp +++ b/esphome/core/helpers.cpp @@ -380,6 +380,20 @@ static char *format_hex_internal(char *buffer, size_t buffer_size, const uint8_t return buffer; } +char *uint32_to_str_unchecked(char *buf, uint32_t val) { + if (val == 0) { + *buf++ = '0'; + return buf; + } + char *start = buf; + while (val > 0) { + *buf++ = '0' + (val % 10); + val /= 10; + } + std::reverse(start, buf); + return buf; +} + char *format_hex_to(char *buffer, size_t buffer_size, const uint8_t *data, size_t length) { return format_hex_internal(buffer, buffer_size, data, length, 0, 'a'); } @@ -529,28 +543,58 @@ std::string value_accuracy_to_string(float value, int8_t accuracy_decimals) { return std::string(buf); } +// Fast float-to-string for accuracy_decimals 0-3 (covers virtually all sensor usage). +// Avoids snprintf("%.*f") which pulls in heavy float formatting machinery. +// Caller must guarantee value is finite and |value| * mult fits in uint32_t. +static size_t value_accuracy_to_buf_fast(char *buf, float value, int8_t accuracy_decimals, uint32_t mult) { + char *p = buf; + if (std::signbit(value)) { + *p++ = '-'; + value = -value; + } + // Cast to double for the multiply to match snprintf's rounding precision. + // float*int loses bits at exact-half boundaries (e.g. 23.45f*10 = 234.5 in float, + // but snprintf sees 234.500007... via double promotion and rounds differently). + // llrint returns long long so the result fits even on 32-bit targets where + // long is 32-bit; caller has already bounded |value * mult| to UINT32_MAX. + uint32_t scaled = static_cast(llrint(static_cast(value) * mult)); + p = uint32_to_str_unchecked(p, scaled / mult); + if (accuracy_decimals > 0) { + *p++ = '.'; + p = frac_to_str_unchecked(p, scaled % mult, mult / 10); + } + *p = '\0'; + return static_cast(p - buf); +} + size_t value_accuracy_to_buf(std::span buf, float value, int8_t accuracy_decimals) { normalize_accuracy_decimals(value, accuracy_decimals); - // snprintf returns chars that would be written (excluding null), or negative on error + + // Fast path for accuracy 0-3, finite values whose scaled magnitude fits in uint32_t. + // For 3 decimals that's |value| < ~4.29e6; larger totals fall through to snprintf. + if (accuracy_decimals <= 3 && std::isfinite(value)) { + const uint32_t mult = small_pow10(accuracy_decimals); + if (std::fabs(value) < static_cast(UINT32_MAX) / mult) { + return value_accuracy_to_buf_fast(buf.data(), value, accuracy_decimals, mult); + } + } + + // Fallback for NaN/Inf/high accuracy/out-of-range int len = snprintf(buf.data(), buf.size(), "%.*f", accuracy_decimals, value); if (len < 0) - return 0; // encoding error - // On truncation, snprintf returns would-be length; actual written is buf.size() - 1 + return 0; return static_cast(len) >= buf.size() ? buf.size() - 1 : static_cast(len); } size_t value_accuracy_with_uom_to_buf(std::span buf, float value, int8_t accuracy_decimals, StringRef unit_of_measurement) { - if (unit_of_measurement.empty()) { - return value_accuracy_to_buf(buf, value, accuracy_decimals); + size_t len = value_accuracy_to_buf(buf, value, accuracy_decimals); + if (len == 0 || unit_of_measurement.empty()) { + return len; } - normalize_accuracy_decimals(value, accuracy_decimals); - // snprintf returns chars that would be written (excluding null), or negative on error - int len = snprintf(buf.data(), buf.size(), "%.*f %s", accuracy_decimals, value, unit_of_measurement.c_str()); - if (len < 0) - return 0; // encoding error - // On truncation, snprintf returns would-be length; actual written is buf.size() - 1 - return static_cast(len) >= buf.size() ? buf.size() - 1 : static_cast(len); + char *end = buf_append_sep_str(buf.data() + len, buf.size() - len, ' ', unit_of_measurement.c_str(), + unit_of_measurement.size()); + return static_cast(end - buf.data()); } int8_t step_to_accuracy_decimals(float step) { diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h index 3c42d7df07..4bb958c40e 100644 --- a/esphome/core/helpers.h +++ b/esphome/core/helpers.h @@ -1295,6 +1295,56 @@ inline char *int8_to_str(char *buf, int8_t val) { return buf; } +/// Append a separator char and a string to a buffer, respecting remaining space. +/// Returns pointer past last char written. The buffer is always null-terminated +/// when remaining >= 1 (even on the no-room early-return), so callers always get +/// a valid C string. +inline char *buf_append_sep_str(char *buf, size_t remaining, char separator, const char *str, size_t str_len) { + if (remaining < 2) { + if (remaining >= 1) { + *buf = '\0'; + } + return buf; + } + *buf++ = separator; + remaining--; + size_t copy_len = std::min(str_len, remaining - 1); + memcpy(buf, str, copy_len); + buf += copy_len; + *buf = '\0'; + return buf; +} + +/// Return 10^n for small non-negative n (0-3) as uint32_t, avoiding float. +inline uint32_t small_pow10(int8_t n) { return n == 3 ? 1000 : n == 2 ? 100 : n == 1 ? 10 : 1; } + +/// Minimum buffer size for uint32_to_str: 10 digits + null terminator. +static constexpr size_t UINT32_MAX_STR_SIZE = 11; + +/// Write unsigned 32-bit integer to buffer (internal, no size check). +/// Buffer must have at least 10 bytes free. Returns pointer past last char written. +char *uint32_to_str_unchecked(char *buf, uint32_t val); + +/// Write unsigned 32-bit integer to buffer with compile-time size check. +/// Null-terminates the output. Returns number of chars written (excluding null). +inline size_t uint32_to_str(std::span buf, uint32_t val) { + char *end = uint32_to_str_unchecked(buf.data(), val); + *end = '\0'; + return static_cast(end - buf.data()); +} + +/// Write fractional digits with leading zeros to buffer (internal, no size check). +/// frac is the fractional value, divisor is the highest place value (e.g. 100 for 3 digits). +/// Returns pointer past last char written. +inline char *frac_to_str_unchecked(char *buf, uint32_t frac, uint32_t divisor) { + while (divisor > 0) { + *buf++ = '0' + static_cast(frac / divisor); + frac %= divisor; + divisor /= 10; + } + return buf; +} + /// Format byte array as lowercase hex to buffer (base implementation). char *format_hex_to(char *buffer, size_t buffer_size, const uint8_t *data, size_t length); diff --git a/esphome/idf_component.yml b/esphome/idf_component.yml index bf42730e67..f4e3e751ec 100644 --- a/esphome/idf_component.yml +++ b/esphome/idf_component.yml @@ -3,6 +3,8 @@ dependencies: version: "7.4.2" esphome/esp-audio-libs: version: 2.0.4 + esphome/micro-decoder: + version: 0.1.1 esphome/micro-flac: version: 0.1.1 esphome/micro-opus: diff --git a/tests/benchmarks/core/bench_helpers.cpp b/tests/benchmarks/core/bench_helpers.cpp index d9a9d158a3..1ce9101ff6 100644 --- a/tests/benchmarks/core/bench_helpers.cpp +++ b/tests/benchmarks/core/bench_helpers.cpp @@ -1,4 +1,6 @@ #include +#include +#include #include "esphome/core/helpers.h" @@ -307,4 +309,58 @@ static void Base64Decode_32Bytes(benchmark::State &state) { } BENCHMARK(Base64Decode_32Bytes); +// --- uint32_to_str() vs snprintf --- + +static void Uint32ToStr_Small(benchmark::State &state) { + char buf[UINT32_MAX_STR_SIZE]; + for (auto _ : state) { + for (int i = 0; i < kInnerIterations; i++) { + uint32_to_str(buf, 12345); + benchmark::DoNotOptimize(buf); + benchmark::ClobberMemory(); + } + } + state.SetItemsProcessed(state.iterations() * kInnerIterations); +} +BENCHMARK(Uint32ToStr_Small); + +static void Snprintf_Uint32_Small(benchmark::State &state) { + char buf[UINT32_MAX_STR_SIZE]; + for (auto _ : state) { + for (int i = 0; i < kInnerIterations; i++) { + snprintf(buf, sizeof(buf), "%" PRIu32, static_cast(12345)); + benchmark::DoNotOptimize(buf); + benchmark::ClobberMemory(); + } + } + state.SetItemsProcessed(state.iterations() * kInnerIterations); +} +BENCHMARK(Snprintf_Uint32_Small); + +static void Uint32ToStr_Large(benchmark::State &state) { + char buf[UINT32_MAX_STR_SIZE]; + for (auto _ : state) { + for (int i = 0; i < kInnerIterations; i++) { + uint32_to_str(buf, 4294967295u); + benchmark::DoNotOptimize(buf); + benchmark::ClobberMemory(); + } + } + state.SetItemsProcessed(state.iterations() * kInnerIterations); +} +BENCHMARK(Uint32ToStr_Large); + +static void Snprintf_Uint32_Large(benchmark::State &state) { + char buf[UINT32_MAX_STR_SIZE]; + for (auto _ : state) { + for (int i = 0; i < kInnerIterations; i++) { + snprintf(buf, sizeof(buf), "%" PRIu32, static_cast(4294967295u)); + benchmark::DoNotOptimize(buf); + benchmark::ClobberMemory(); + } + } + state.SetItemsProcessed(state.iterations() * kInnerIterations); +} +BENCHMARK(Snprintf_Uint32_Large); + } // namespace esphome::benchmarks diff --git a/tests/components/core/test_helpers.cpp b/tests/components/core/test_helpers.cpp index 00169621c3..5fb77ef753 100644 --- a/tests/components/core/test_helpers.cpp +++ b/tests/components/core/test_helpers.cpp @@ -117,4 +117,100 @@ TEST(FormatHexChar, UppercaseDigits) { EXPECT_EQ(format_hex_pretty_char(15), 'F'); } +// --- small_pow10() --- + +TEST(SmallPow10, Zero) { EXPECT_EQ(small_pow10(0), 1u); } +TEST(SmallPow10, One) { EXPECT_EQ(small_pow10(1), 10u); } +TEST(SmallPow10, Two) { EXPECT_EQ(small_pow10(2), 100u); } +TEST(SmallPow10, Three) { EXPECT_EQ(small_pow10(3), 1000u); } + +// --- frac_to_str_unchecked() --- + +TEST(FracToStr, OneDigit) { + char buf[8]; + char *end = frac_to_str_unchecked(buf, 5, 1); + *end = '\0'; + EXPECT_STREQ(buf, "5"); + EXPECT_EQ(end - buf, 1); +} + +TEST(FracToStr, TwoDigits) { + char buf[8]; + char *end = frac_to_str_unchecked(buf, 46, 10); + *end = '\0'; + EXPECT_STREQ(buf, "46"); +} + +TEST(FracToStr, ThreeDigits) { + char buf[8]; + char *end = frac_to_str_unchecked(buf, 456, 100); + *end = '\0'; + EXPECT_STREQ(buf, "456"); + EXPECT_EQ(end - buf, 3); +} + +TEST(FracToStr, LeadingZeros) { + char buf[8]; + char *end = frac_to_str_unchecked(buf, 1, 100); + *end = '\0'; + EXPECT_STREQ(buf, "001"); + + end = frac_to_str_unchecked(buf, 5, 10); + *end = '\0'; + EXPECT_STREQ(buf, "05"); +} + +TEST(FracToStr, AllZeros) { + char buf[8]; + char *end = frac_to_str_unchecked(buf, 0, 100); + *end = '\0'; + EXPECT_STREQ(buf, "000"); + + end = frac_to_str_unchecked(buf, 0, 1); + *end = '\0'; + EXPECT_STREQ(buf, "0"); +} + +TEST(FracToStr, ZeroDivisor) { + char buf[8]; + buf[0] = 'X'; + char *end = frac_to_str_unchecked(buf, 0, 0); + EXPECT_EQ(end, buf); // writes nothing +} + +// --- buf_append_sep_str() --- + +TEST(BufAppendSepStr, Basic) { + char buf[32] = "23.46"; + char *start = buf + 5; + char *end = buf_append_sep_str(start, sizeof(buf) - 5, ' ', "°C", 3); + EXPECT_STREQ(buf, "23.46 °C"); + EXPECT_EQ(end - buf, 9); // "°C" is 3 bytes (UTF-8) +} + +TEST(BufAppendSepStr, EmptyString) { + char buf[32] = "100"; + char *start = buf + 3; + char *end = buf_append_sep_str(start, sizeof(buf) - 3, ' ', "", 0); + EXPECT_STREQ(buf, "100 "); + EXPECT_EQ(end - start, 1); // just the separator +} + +TEST(BufAppendSepStr, NoRoom) { + char buf[8] = "1234567"; + char *start = buf + 7; + char *end = buf_append_sep_str(start, 1, ' ', "unit", 4); + EXPECT_EQ(end, start); // nothing written +} + +TEST(BufAppendSepStr, Truncation) { + char buf[8] = "val"; + char *start = buf + 3; + // remaining = 5, separator takes 1, so 3 chars of string fit + null + char *end = buf_append_sep_str(start, 5, ' ', "longunit", 8); + *end = '\0'; + EXPECT_STREQ(buf, "val lon"); + EXPECT_EQ(end - buf, 7); +} + } // namespace esphome::core::testing diff --git a/tests/components/core/test_uint32_to_str.cpp b/tests/components/core/test_uint32_to_str.cpp new file mode 100644 index 0000000000..fc754429ec --- /dev/null +++ b/tests/components/core/test_uint32_to_str.cpp @@ -0,0 +1,77 @@ +#include + +#include "esphome/core/helpers.h" + +namespace esphome::core::testing { + +// --- uint32_to_str_unchecked() (internal, raw pointer) --- + +TEST(Uint32ToStr, InternalZero) { + char buf[UINT32_MAX_STR_SIZE]; + char *end = uint32_to_str_unchecked(buf, 0); + *end = '\0'; + EXPECT_STREQ(buf, "0"); + EXPECT_EQ(end - buf, 1); +} + +TEST(Uint32ToStr, InternalSingleDigit) { + char buf[UINT32_MAX_STR_SIZE]; + char *end = uint32_to_str_unchecked(buf, 7); + *end = '\0'; + EXPECT_STREQ(buf, "7"); +} + +TEST(Uint32ToStr, InternalMultiDigit) { + char buf[UINT32_MAX_STR_SIZE]; + char *end = uint32_to_str_unchecked(buf, 12345); + *end = '\0'; + EXPECT_STREQ(buf, "12345"); + EXPECT_EQ(end - buf, 5); +} + +TEST(Uint32ToStr, InternalMaxValue) { + char buf[UINT32_MAX_STR_SIZE]; + char *end = uint32_to_str_unchecked(buf, 4294967295u); + *end = '\0'; + EXPECT_STREQ(buf, "4294967295"); + EXPECT_EQ(end - buf, 10); +} + +TEST(Uint32ToStr, InternalPowersOfTen) { + char buf[UINT32_MAX_STR_SIZE]; + char *end; + + end = uint32_to_str_unchecked(buf, 10); + *end = '\0'; + EXPECT_STREQ(buf, "10"); + + end = uint32_to_str_unchecked(buf, 100); + *end = '\0'; + EXPECT_STREQ(buf, "100"); + + end = uint32_to_str_unchecked(buf, 1000000); + *end = '\0'; + EXPECT_STREQ(buf, "1000000"); +} + +// --- uint32_to_str() (public, span API) --- + +TEST(Uint32ToStr, SpanZero) { + char buf[UINT32_MAX_STR_SIZE]; + EXPECT_EQ(uint32_to_str(buf, 0), 1u); + EXPECT_STREQ(buf, "0"); +} + +TEST(Uint32ToStr, SpanMultiDigit) { + char buf[UINT32_MAX_STR_SIZE]; + EXPECT_EQ(uint32_to_str(buf, 12345), 5u); + EXPECT_STREQ(buf, "12345"); +} + +TEST(Uint32ToStr, SpanMaxValue) { + char buf[UINT32_MAX_STR_SIZE]; + EXPECT_EQ(uint32_to_str(buf, 4294967295u), 10u); + EXPECT_STREQ(buf, "4294967295"); +} + +} // namespace esphome::core::testing diff --git a/tests/components/core/test_value_accuracy.cpp b/tests/components/core/test_value_accuracy.cpp new file mode 100644 index 0000000000..6bd8976acc --- /dev/null +++ b/tests/components/core/test_value_accuracy.cpp @@ -0,0 +1,152 @@ +#include +#include +#include +#include +#include +#include + +#include "esphome/core/helpers.h" + +namespace esphome::core::testing { + +// Helper to call value_accuracy_to_buf and return as string +static std::string va_to_string(float value, int8_t accuracy_decimals) { + char buf[VALUE_ACCURACY_MAX_LEN]; + std::span sp(buf); + size_t len = value_accuracy_to_buf(sp, value, accuracy_decimals); + return std::string(buf, len); +} + +// Helper: reference implementation using snprintf for comparison +static std::string va_reference(float value, int8_t accuracy_decimals) { + // Replicate normalize_accuracy_decimals logic + if (accuracy_decimals < 0) { + float divisor; + if (accuracy_decimals == -1) { + divisor = 10.0f; + } else if (accuracy_decimals == -2) { + divisor = 100.0f; + } else { + divisor = pow10_int(-accuracy_decimals); + } + value = roundf(value / divisor) * divisor; + accuracy_decimals = 0; + } + char buf[VALUE_ACCURACY_MAX_LEN]; + snprintf(buf, sizeof(buf), "%.*f", accuracy_decimals, value); + return std::string(buf); +} + +// --- Basic formatting --- + +TEST(ValueAccuracyToBuf, ZeroDecimals) { + EXPECT_EQ(va_to_string(23.456f, 0), "23"); + EXPECT_EQ(va_to_string(0.0f, 0), "0"); + EXPECT_EQ(va_to_string(100.0f, 0), "100"); + EXPECT_EQ(va_to_string(1.0f, 0), "1"); +} + +TEST(ValueAccuracyToBuf, OneDecimal) { + EXPECT_EQ(va_to_string(23.456f, 1), "23.5"); + EXPECT_EQ(va_to_string(0.0f, 1), "0.0"); + EXPECT_EQ(va_to_string(1.05f, 1), va_reference(1.05f, 1)); +} + +TEST(ValueAccuracyToBuf, TwoDecimals) { + EXPECT_EQ(va_to_string(23.456f, 2), "23.46"); + EXPECT_EQ(va_to_string(0.0f, 2), "0.00"); + EXPECT_EQ(va_to_string(1.005f, 2), va_reference(1.005f, 2)); +} + +TEST(ValueAccuracyToBuf, ThreeDecimals) { + EXPECT_EQ(va_to_string(23.456f, 3), "23.456"); + EXPECT_EQ(va_to_string(0.0f, 3), "0.000"); +} + +// --- Negative values --- + +TEST(ValueAccuracyToBuf, NegativeValues) { + EXPECT_EQ(va_to_string(-23.456f, 2), "-23.46"); + EXPECT_EQ(va_to_string(-0.5f, 1), "-0.5"); + EXPECT_EQ(va_to_string(-100.0f, 0), "-100"); +} + +// --- Negative accuracy_decimals (rounding to tens/hundreds) --- + +TEST(ValueAccuracyToBuf, NegativeAccuracy) { + EXPECT_EQ(va_to_string(1234.0f, -1), va_reference(1234.0f, -1)); + EXPECT_EQ(va_to_string(1234.0f, -2), va_reference(1234.0f, -2)); + EXPECT_EQ(va_to_string(56.0f, -1), va_reference(56.0f, -1)); +} + +// --- Special float values --- + +TEST(ValueAccuracyToBuf, NaN) { + std::string result = va_to_string(NAN, 2); + EXPECT_EQ(result, va_reference(NAN, 2)); +} + +TEST(ValueAccuracyToBuf, Infinity) { + std::string result = va_to_string(INFINITY, 2); + EXPECT_EQ(result, va_reference(INFINITY, 2)); +} + +TEST(ValueAccuracyToBuf, NegativeInfinity) { + std::string result = va_to_string(-INFINITY, 2); + EXPECT_EQ(result, va_reference(-INFINITY, 2)); +} + +// --- Edge cases --- + +TEST(ValueAccuracyToBuf, VerySmallValues) { + EXPECT_EQ(va_to_string(0.001f, 3), "0.001"); + EXPECT_EQ(va_to_string(0.001f, 2), "0.00"); + EXPECT_EQ(va_to_string(0.009f, 2), "0.01"); +} + +TEST(ValueAccuracyToBuf, LargeValues) { + EXPECT_EQ(va_to_string(999999.0f, 0), va_reference(999999.0f, 0)); + EXPECT_EQ(va_to_string(1013.25f, 2), "1013.25"); +} + +TEST(ValueAccuracyToBuf, Rounding) { + // 0.5 rounds up + EXPECT_EQ(va_to_string(23.5f, 0), "24"); + EXPECT_EQ(va_to_string(23.45f, 1), "23.5"); // float: 23.45 -> 23.4 or 23.5 + EXPECT_EQ(va_to_string(23.45f, 1), va_reference(23.45f, 1)); +} + +// --- Match snprintf for a range of typical sensor values --- + +TEST(ValueAccuracyToBuf, MatchesSnprintf) { + float test_values[] = {0.0f, 1.0f, -1.0f, 23.456f, -23.456f, 100.0f, 0.1f, 0.01f, 99.99f, 1013.25f, -40.0f}; + int8_t test_accuracies[] = {0, 1, 2, 3}; + + for (float value : test_values) { + for (int8_t acc : test_accuracies) { + EXPECT_EQ(va_to_string(value, acc), va_reference(value, acc)) + << "Mismatch for value=" << value << " accuracy=" << static_cast(acc); + } + } +} + +// --- Return value (length) --- + +TEST(ValueAccuracyToBuf, ReturnsCorrectLength) { + char buf[VALUE_ACCURACY_MAX_LEN]; + std::span sp(buf); + + size_t len = value_accuracy_to_buf(sp, 23.456f, 2); + EXPECT_EQ(len, 5u); // "23.46" + EXPECT_EQ(strlen(buf), len); + + len = value_accuracy_to_buf(sp, 0.0f, 0); + EXPECT_EQ(len, 1u); // "0" + EXPECT_EQ(strlen(buf), len); + + len = value_accuracy_to_buf(sp, -100.0f, 1); + EXPECT_EQ(len, 6u); // "-100.0" + EXPECT_EQ(strlen(buf), len); +} + +} // namespace esphome::core::testing