tdlib-fork/tdutils/td/utils/misc.cpp

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/misc.h"

#include "td/utils/port/thread_local.h"

#include <algorithm>
#include <cstdlib>
#include <locale>
#include <sstream>

namespace td {

char *str_dup(Slice str) {
  char *res = static_cast<char *>(std::malloc(str.size() + 1));
  if (res == nullptr) {
    return nullptr;
  }
  std::copy(str.begin(), str.end(), res);
  res[str.size()] = '\0';
  return res;
}

string implode(vector<string> v, char delimiter) {
  string result;
  for (auto &str : v) {
    if (!result.empty()) {
      result += delimiter;
    }
    result += str;
  }
  return result;
}

string oneline(Slice str) {
  string result;
  result.reserve(str.size());
  bool after_new_line = true;
  for (auto c : str) {
    if (c != '\n') {
      if (after_new_line) {
        if (c == ' ') {
          continue;
        }
        after_new_line = false;
      }
      result += c;
    } else {
      after_new_line = true;
      result += ' ';
    }
  }
  while (!result.empty() && result.back() == ' ') {
    result.pop_back();
  }
  return result;
}

double to_double(Slice str) {
  static TD_THREAD_LOCAL std::stringstream *ss;
  if (init_thread_local<std::stringstream>(ss)) {
    ss->imbue(std::locale::classic());
  } else {
    ss->str(std::string());
    ss->clear();
  }
  ss->write(str.begin(), narrow_cast<std::streamsize>(str.size()));

  double result = 0.0;
  *ss >> result;
  return result;
}

}  // namespace td