1 files changed, 102 insertions, 0 deletions
diff --git a/protocols/Telegram/tdlib/td/tdutils/td/utils/StringBuilder.cpp b/protocols/Telegram/tdlib/td/tdutils/td/utils/StringBuilder.cpp
new file mode 100644
index 0000000000..ce64bbc9a6
--- /dev/null
+++ b/protocols/Telegram/tdlib/td/tdutils/td/utils/StringBuilder.cpp
@@ -0,0 +1,102 @@
+//
+// 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/StringBuilder.h"
+
+#include "td/utils/misc.h"
+#include "td/utils/port/thread_local.h"
+
+#include <cstdio>
+#include <locale>
+#include <sstream>
+
+namespace td {
+
+// TODO: optimize
+StringBuilder &StringBuilder::operator<<(int x) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+  current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%d", x);
+  return *this;
+}
+
+StringBuilder &StringBuilder::operator<<(unsigned int x) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+  current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%u", x);
+  return *this;
+}
+
+StringBuilder &StringBuilder::operator<<(long int x) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+  current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%ld", x);
+  return *this;
+}
+
+StringBuilder &StringBuilder::operator<<(long unsigned int x) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+  current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%lu", x);
+  return *this;
+}
+
+StringBuilder &StringBuilder::operator<<(long long int x) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+  current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%lld", x);
+  return *this;
+}
+
+StringBuilder &StringBuilder::operator<<(long long unsigned int x) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+  current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%llu", x);
+  return *this;
+}
+
+StringBuilder &StringBuilder::operator<<(FixedDouble x) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+
+  static TD_THREAD_LOCAL std::stringstream *ss;
+  if (init_thread_local<std::stringstream>(ss)) {
+    ss->imbue(std::locale::classic());
+    ss->setf(std::ios_base::fixed, std::ios_base::floatfield);
+  } else {
+    ss->str(std::string());
+    ss->clear();
+  }
+  ss->precision(x.precision);
+  *ss << x.d;
+
+  int len = narrow_cast<int>(static_cast<std::streamoff>(ss->tellp()));
+  auto left = end_ptr_ + reserved_size - current_ptr_;
+  if (unlikely(len >= left)) {
+    error_flag_ = true;
+    len = left ? narrow_cast<int>(left - 1) : 0;
+  }
+  ss->read(current_ptr_, len);
+  current_ptr_ += len;
+  return *this;
+}
+
+StringBuilder &StringBuilder::operator<<(const void *ptr) {
+  if (unlikely(end_ptr_ < current_ptr_)) {
+    return on_error();
+  }
+  current_ptr_ += std::snprintf(current_ptr_, reserved_size, "%p", ptr);
+  return *this;
+}
+
+}  // namespace td