#include "string_util.h" #include #ifdef BENCHMARK_STL_ANDROID_GNUSTL #include #endif #include #include #include #include #include #include "arraysize.h" #include "benchmark/benchmark.h" namespace benchmark { namespace { // kilo, Mega, Giga, Tera, Peta, Exa, Zetta, Yotta. const char* const kBigSIUnits[] = {"k", "M", "G", "T", "P", "E", "Z", "Y"}; // Kibi, Mebi, Gibi, Tebi, Pebi, Exbi, Zebi, Yobi. const char* const kBigIECUnits[] = {"Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi"}; // milli, micro, nano, pico, femto, atto, zepto, yocto. const char* const kSmallSIUnits[] = {"m", "u", "n", "p", "f", "a", "z", "y"}; // We require that all three arrays have the same size. static_assert(arraysize(kBigSIUnits) == arraysize(kBigIECUnits), "SI and IEC unit arrays must be the same size"); static_assert(arraysize(kSmallSIUnits) == arraysize(kBigSIUnits), "Small SI and Big SI unit arrays must be the same size"); static const int64_t kUnitsSize = arraysize(kBigSIUnits); void ToExponentAndMantissa(double val, int precision, double one_k, std::string* mantissa, int64_t* exponent) { std::stringstream mantissa_stream; if (val < 0) { mantissa_stream << "-"; val = -val; } // Adjust threshold so that it never excludes things which can't be rendered // in 'precision' digits. const double adjusted_threshold = std::max(1.0, 1.0 / std::pow(10.0, precision)); const double big_threshold = (adjusted_threshold * one_k) - 1; const double small_threshold = adjusted_threshold; // Values in ]simple_threshold,small_threshold[ will be printed as-is const double simple_threshold = 0.01; if (val > big_threshold) { // Positive powers double scaled = val; for (size_t i = 0; i < arraysize(kBigSIUnits); ++i) { scaled /= one_k; if (scaled <= big_threshold) { mantissa_stream << scaled; *exponent = static_cast(i + 1); *mantissa = mantissa_stream.str(); return; } } mantissa_stream << val; *exponent = 0; } else if (val < small_threshold) { // Negative powers if (val < simple_threshold) { double scaled = val; for (size_t i = 0; i < arraysize(kSmallSIUnits); ++i) { scaled *= one_k; if (scaled >= small_threshold) { mantissa_stream << scaled; *exponent = -static_cast(i + 1); *mantissa = mantissa_stream.str(); return; } } } mantissa_stream << val; *exponent = 0; } else { mantissa_stream << val; *exponent = 0; } *mantissa = mantissa_stream.str(); } std::string ExponentToPrefix(int64_t exponent, bool iec) { if (exponent == 0) return ""; const int64_t index = (exponent > 0 ? exponent - 1 : -exponent - 1); if (index >= kUnitsSize) return ""; const char* const* array = (exponent > 0 ? (iec ? kBigIECUnits : kBigSIUnits) : kSmallSIUnits); return std::string(array[index]); } std::string ToBinaryStringFullySpecified(double value, int precision, Counter::OneK one_k) { std::string mantissa; int64_t exponent; ToExponentAndMantissa(value, precision, one_k == Counter::kIs1024 ? 1024.0 : 1000.0, &mantissa, &exponent); return mantissa + ExponentToPrefix(exponent, one_k == Counter::kIs1024); } std::string StrFormatImp(const char* msg, va_list args) { // we might need a second shot at this, so pre-emptivly make a copy va_list args_cp; va_copy(args_cp, args); // TODO(ericwf): use std::array for first attempt to avoid one memory // allocation guess what the size might be std::array local_buff; // 2015-10-08: vsnprintf is used instead of snd::vsnprintf due to a limitation // in the android-ndk auto ret = vsnprintf(local_buff.data(), local_buff.size(), msg, args_cp); va_end(args_cp); // handle empty expansion if (ret == 0) return std::string{}; if (static_cast(ret) < local_buff.size()) return std::string(local_buff.data()); // we did not provide a long enough buffer on our first attempt. // add 1 to size to account for null-byte in size cast to prevent overflow std::size_t size = static_cast(ret) + 1; auto buff_ptr = std::unique_ptr(new char[size]); // 2015-10-08: vsnprintf is used instead of snd::vsnprintf due to a limitation // in the android-ndk vsnprintf(buff_ptr.get(), size, msg, args); return std::string(buff_ptr.get()); } } // end namespace std::string HumanReadableNumber(double n, Counter::OneK one_k) { return ToBinaryStringFullySpecified(n, 1, one_k); } std::string StrFormat(const char* format, ...) { va_list args; va_start(args, format); std::string tmp = StrFormatImp(format, args); va_end(args); return tmp; } std::vector StrSplit(const std::string& str, char delim) { if (str.empty()) return {}; std::vector ret; size_t first = 0; size_t next = str.find(delim); for (; next != std::string::npos; first = next + 1, next = str.find(delim, first)) { ret.push_back(str.substr(first, next - first)); } ret.push_back(str.substr(first)); return ret; } #ifdef BENCHMARK_STL_ANDROID_GNUSTL /* * GNU STL in Android NDK lacks support for some C++11 functions, including * stoul, stoi, stod. We reimplement them here using C functions strtoul, * strtol, strtod. Note that reimplemented functions are in benchmark:: * namespace, not std:: namespace. */ unsigned long stoul(const std::string& str, size_t* pos, int base) { /* Record previous errno */ const int oldErrno = errno; errno = 0; const char* strStart = str.c_str(); char* strEnd = const_cast(strStart); const unsigned long result = strtoul(strStart, &strEnd, base); const int strtoulErrno = errno; /* Restore previous errno */ errno = oldErrno; /* Check for errors and return */ if (strtoulErrno == ERANGE) { throw std::out_of_range("stoul failed: " + str + " is outside of range of unsigned long"); } else if (strEnd == strStart || strtoulErrno != 0) { throw std::invalid_argument("stoul failed: " + str + " is not an integer"); } if (pos != nullptr) { *pos = static_cast(strEnd - strStart); } return result; } int stoi(const std::string& str, size_t* pos, int base) { /* Record previous errno */ const int oldErrno = errno; errno = 0; const char* strStart = str.c_str(); char* strEnd = const_cast(strStart); const long result = strtol(strStart, &strEnd, base); const int strtolErrno = errno; /* Restore previous errno */ errno = oldErrno; /* Check for errors and return */ if (strtolErrno == ERANGE || long(int(result)) != result) { throw std::out_of_range("stoul failed: " + str + " is outside of range of int"); } else if (strEnd == strStart || strtolErrno != 0) { throw std::invalid_argument("stoul failed: " + str + " is not an integer"); } if (pos != nullptr) { *pos = static_cast(strEnd - strStart); } return int(result); } double stod(const std::string& str, size_t* pos) { /* Record previous errno */ const int oldErrno = errno; errno = 0; const char* strStart = str.c_str(); char* strEnd = const_cast(strStart); const double result = strtod(strStart, &strEnd); /* Restore previous errno */ const int strtodErrno = errno; errno = oldErrno; /* Check for errors and return */ if (strtodErrno == ERANGE) { throw std::out_of_range("stoul failed: " + str + " is outside of range of int"); } else if (strEnd == strStart || strtodErrno != 0) { throw std::invalid_argument("stoul failed: " + str + " is not an integer"); } if (pos != nullptr) { *pos = static_cast(strEnd - strStart); } return result; } #endif } // end namespace benchmark