llvm/third-party/benchmark/src/string_util.cc

#include "string_util.h"

#include <array>
#ifdef BENCHMARK_STL_ANDROID_GNUSTL
#include <cerrno>
#endif
#include <cmath>
#include <cstdarg>
#include <cstdio>
#include <memory>
#include <sstream>

#include "arraysize.h"
#include "benchmark/benchmark.h"

namespace benchmark {
namespace …  // end namespace

std::string HumanReadableNumber(double n, Counter::OneK one_k) { … }

std::string StrFormat(const char* format, ...) { … }

std::vector<std::string> StrSplit(const std::string& str, char delim) { … }

#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<char*>(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<size_t>(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<char*>(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<size_t>(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<char*>(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<size_t>(strEnd - strStart);
  }
  return result;
}
#endif

}  // end namespace benchmark