Initial Commit

include/asio/impl/config.hpp

@@ -0,0 +1,102 @@
+//
+// impl/config.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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)
+//
+
+#ifndef ASIO_IMPL_CONFIG_HPP
+#define ASIO_IMPL_CONFIG_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <cerrno>
+#include <cstdlib>
+#include <limits>
+#include <stdexcept>
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename T>
+T config_get(const config_service& service, const char* section,
+    const char* key_name, T default_value, false_type /*is_bool*/)
+{
+  if (is_unsigned<T>::value)
+  {
+    char buf[std::numeric_limits<unsigned long long>::digits10
+        + 1 /* sign */ + 1 /* partial digit */ + 1 /* NUL */];
+    if (const char* str = service.get_value(
+          section, key_name, buf, sizeof(buf)))
+    {
+      char* end = nullptr;
+      errno = 0;
+      unsigned long long result = std::strtoull(str, &end, 0);
+      if (errno == ERANGE
+          || result > static_cast<unsigned long long>(
+            (std::numeric_limits<T>::max)()))
+        detail::throw_exception(std::out_of_range("config out of range"));
+      return static_cast<T>(result);
+    }
+  }
+  else
+  {
+    char buf[std::numeric_limits<unsigned long long>::digits10
+        + 1 /* sign */ + 1 /* partial digit */ + 1 /* NUL */];
+    if (const char* str = service.get_value(
+          section, key_name, buf, sizeof(buf)))
+    {
+      char* end = nullptr;
+      errno = 0;
+      long long result = std::strtoll(str, &end, 0);
+      if (errno == ERANGE || result < (std::numeric_limits<T>::min)()
+          || result > (std::numeric_limits<T>::max)())
+        detail::throw_exception(std::out_of_range("config out of range"));
+      return static_cast<T>(result);
+    }
+  }
+  return default_value;
+}
+
+template <typename T>
+T config_get(const config_service& service, const char* section,
+    const char* key_name, T default_value, true_type /*is_bool*/)
+{
+  char buf[std::numeric_limits<unsigned long long>::digits10
+      + 1 /* sign */ + 1 /* partial digit */ + 1 /* NUL */];
+  if (const char* str = service.get_value(
+        section, key_name, buf, sizeof(buf)))
+  {
+    char* end = nullptr;
+    errno = 0;
+    unsigned long long result = std::strtoll(str, &end, 0);
+    if (errno == ERANGE || (result != 0 && result != 1))
+      detail::throw_exception(std::out_of_range("config out of range"));
+    return static_cast<T>(result != 0);
+  }
+  return default_value;
+}
+
+} // namespace detail
+
+template <typename T>
+constraint_t<is_integral<T>::value, T>
+config::get(const char* section, const char* key_name, T default_value) const
+{
+  return detail::config_get(service_, section,
+      key_name, default_value, is_same<T, bool>());
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_CONFIG_HPP