text: /*
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #pragma once
  
  #include <folly/FBString.h>
  
  namespace folly {
  
  /**
   * Return the demangled (prettyfied) version of a C++ type.
   *
   * This function tries to produce a human-readable type, but the type name will
   * be returned unchanged in case of error or if demangling isn't supported on
   * your system.
   *
   * Use for debugging -- do not rely on demangle() returning anything useful.
   *
   * This function may allocate memory (and therefore throw std::bad_alloc).
   */
  fbstring demangle(const char* name);
  inline fbstring demangle(const std::type_info& type) {
    return demangle(type.name());
  }
  
  /**
   * Return the demangled (prettyfied) version of a C++ type in a user-provided
   * buffer.
   *
   * The semantics are the same as for snprintf or strlcpy: bufSize is the size
   * of the buffer, the string is always null-terminated, and the return value is
   * the number of characters (not including the null terminator) that would have
   * been written if the buffer was big enough. (So a return value >= bufSize
   * indicates that the output was truncated)
   *
   * This function does not allocate memory and is async-signal-safe.
   *
   * Note that the underlying function for the fbstring-returning demangle is
   * somewhat standard (abi::__cxa_demangle, which uses malloc), the underlying
   * function for this version is less so (cplus_demangle_v3_callback from
   * libiberty), so it is possible for the fbstring version to work, while this
   * version returns the original, mangled name.
   */
  size_t demangle(const char* name, char* buf, size_t bufSize);
  inline size_t demangle(const std::type_info& type, char* buf, size_t bufSize) {
    return demangle(type.name(), buf, bufSize);
  }
  
  // glibc doesn't have strlcpy
  size_t strlcpy(char* dest, const char* const src, size_t size);
  
  } // namespace folly
  