// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_STRSTREAM
#define _LIBCPP_STRSTREAM

/*
    strstream synopsis

class strstreambuf
    : public basic_streambuf<char>
{
public:
    explicit strstreambuf(streamsize alsize_arg = 0); // before C++20
    strstreambuf() : strstreambuf(0) {}               // C++20
    explicit strstreambuf(streamsize alsize_arg);     // C++20

    strstreambuf(void* (*palloc_arg)(size_t), void (*pfree_arg)(void*));
    strstreambuf(char* gnext_arg, streamsize n, char* pbeg_arg = nullptr);
    strstreambuf(const char* gnext_arg, streamsize n);

    strstreambuf(signed char* gnext_arg, streamsize n, signed char* pbeg_arg = nullptr);
    strstreambuf(const signed char* gnext_arg, streamsize n);
    strstreambuf(unsigned char* gnext_arg, streamsize n, unsigned char* pbeg_arg = nullptr);
    strstreambuf(const unsigned char* gnext_arg, streamsize n);

    strstreambuf(strstreambuf&& rhs);
    strstreambuf& operator=(strstreambuf&& rhs);

    virtual ~strstreambuf();

    void swap(strstreambuf& rhs);

    void freeze(bool freezefl = true);
    char* str();
    int pcount() const;

protected:
    virtual int_type overflow (int_type c = EOF);
    virtual int_type pbackfail(int_type c = EOF);
    virtual int_type underflow();
    virtual pos_type seekoff(off_type off, ios_base::seekdir way,
                             ios_base::openmode which = ios_base::in | ios_base::out);
    virtual pos_type seekpos(pos_type sp,
                             ios_base::openmode which = ios_base::in | ios_base::out);
    virtual streambuf* setbuf(char* s, streamsize n);

private:
    typedef T1 strstate;                // exposition only
    static const strstate allocated;    // exposition only
    static const strstate constant;     // exposition only
    static const strstate dynamic;      // exposition only
    static const strstate frozen;       // exposition only
    strstate strmode;                   // exposition only
    streamsize alsize;                  // exposition only
    void* (*palloc)(size_t);            // exposition only
    void (*pfree)(void*);               // exposition only
};

class istrstream
    : public basic_istream<char>
{
public:
    explicit istrstream(const char* s);
    explicit istrstream(char* s);
    istrstream(const char* s, streamsize n);
    istrstream(char* s, streamsize n);

    virtual ~istrstream();

    strstreambuf* rdbuf() const;
    char *str();

private:
    strstreambuf sb; // exposition only
};

class ostrstream
    : public basic_ostream<char>
{
public:
    ostrstream();
    ostrstream(char* s, int n, ios_base::openmode mode = ios_base::out);

    virtual ~ostrstream();

    strstreambuf* rdbuf() const;
    void freeze(bool freezefl = true);
    char* str();
    int pcount() const;

private:
    strstreambuf sb; // exposition only
};

class strstream
    : public basic_iostream<char>
{
public:
    // Types
    typedef char                        char_type;
    typedef char_traits<char>::int_type int_type;
    typedef char_traits<char>::pos_type pos_type;
    typedef char_traits<char>::off_type off_type;

    // constructors/destructor
    strstream();
    strstream(char* s, int n, ios_base::openmode mode = ios_base::in | ios_base::out);

    virtual ~strstream();

    // Members:
    strstreambuf* rdbuf() const;
    void freeze(bool freezefl = true);
    int pcount() const;
    char* str();

private:
    strstreambuf sb; // exposition only
};

}  // std

*/

#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#include <istream>
#include <ostream>
#include <version>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

class _LIBCPP_DEPRECATED _LIBCPP_EXPORTED_FROM_ABI strstreambuf : public streambuf {
public:
#ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI strstreambuf() : strstreambuf(0) {}
  explicit strstreambuf(streamsize __alsize);
#else
  explicit strstreambuf(streamsize __alsize = 0);
#endif
  strstreambuf(void* (*__palloc)(size_t), void (*__pfree)(void*));
  strstreambuf(char* __gnext, streamsize __n, char* __pbeg = nullptr);
  strstreambuf(const char* __gnext, streamsize __n);

  strstreambuf(signed char* __gnext, streamsize __n, signed char* __pbeg = nullptr);
  strstreambuf(const signed char* __gnext, streamsize __n);
  strstreambuf(unsigned char* __gnext, streamsize __n, unsigned char* __pbeg = nullptr);
  strstreambuf(const unsigned char* __gnext, streamsize __n);

#ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI strstreambuf(strstreambuf&& __rhs);
  _LIBCPP_HIDE_FROM_ABI strstreambuf& operator=(strstreambuf&& __rhs);
#endif // _LIBCPP_CXX03_LANG

  ~strstreambuf() override;

  void swap(strstreambuf& __rhs);

  void freeze(bool __freezefl = true);
  char* str();
  int pcount() const;

protected:
  int_type overflow(int_type __c = EOF) override;
  int_type pbackfail(int_type __c = EOF) override;
  int_type underflow() override;
  pos_type
  seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __which = ios_base::in | ios_base::out) override;
  pos_type seekpos(pos_type __sp, ios_base::openmode __which = ios_base::in | ios_base::out) override;

private:
  typedef unsigned __mode_type;
  static const __mode_type __allocated     = 0x01;
  static const __mode_type __constant      = 0x02;
  static const __mode_type __dynamic       = 0x04;
  static const __mode_type __frozen        = 0x08;
  static const streamsize __default_alsize = 4096;

  __mode_type __strmode_;
  streamsize __alsize_;
  void* (*__palloc_)(size_t);
  void (*__pfree_)(void*);

  void __init(char* __gnext, streamsize __n, char* __pbeg);
};

#ifndef _LIBCPP_CXX03_LANG

inline _LIBCPP_HIDE_FROM_ABI strstreambuf::strstreambuf(strstreambuf&& __rhs)
    : streambuf(__rhs),
      __strmode_(__rhs.__strmode_),
      __alsize_(__rhs.__alsize_),
      __palloc_(__rhs.__palloc_),
      __pfree_(__rhs.__pfree_) {
  __rhs.setg(nullptr, nullptr, nullptr);
  __rhs.setp(nullptr, nullptr);
}

inline _LIBCPP_HIDE_FROM_ABI strstreambuf& strstreambuf::operator=(strstreambuf&& __rhs) {
  if (eback() && (__strmode_ & __allocated) != 0 && (__strmode_ & __frozen) == 0) {
    if (__pfree_)
      __pfree_(eback());
    else
      delete[] eback();
  }
  streambuf::operator=(__rhs);
  __strmode_ = __rhs.__strmode_;
  __alsize_  = __rhs.__alsize_;
  __palloc_  = __rhs.__palloc_;
  __pfree_   = __rhs.__pfree_;
  __rhs.setg(nullptr, nullptr, nullptr);
  __rhs.setp(nullptr, nullptr);
  return *this;
}

#endif // _LIBCPP_CXX03_LANG

class _LIBCPP_DEPRECATED _LIBCPP_EXPORTED_FROM_ABI istrstream : public istream {
public:
  _LIBCPP_HIDE_FROM_ABI explicit istrstream(const char* __s) : istream(&__sb_), __sb_(__s, 0) {}
  _LIBCPP_HIDE_FROM_ABI explicit istrstream(char* __s) : istream(&__sb_), __sb_(__s, 0) {}
  _LIBCPP_HIDE_FROM_ABI istrstream(const char* __s, streamsize __n) : istream(&__sb_), __sb_(__s, __n) {}
  _LIBCPP_HIDE_FROM_ABI istrstream(char* __s, streamsize __n) : istream(&__sb_), __sb_(__s, __n) {}

#ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI istrstream(istrstream&& __rhs) // extension
      : istream(std::move(static_cast<istream&>(__rhs))), __sb_(std::move(__rhs.__sb_)) {
    istream::set_rdbuf(&__sb_);
  }

  _LIBCPP_HIDE_FROM_ABI istrstream& operator=(istrstream&& __rhs) {
    __sb_ = std::move(__rhs.__sb_);
    istream::operator=(std::move(__rhs));
    return *this;
  }
#endif // _LIBCPP_CXX03_LANG

  ~istrstream() override;

  _LIBCPP_HIDE_FROM_ABI void swap(istrstream& __rhs) {
    istream::swap(__rhs);
    __sb_.swap(__rhs.__sb_);
  }

  _LIBCPP_HIDE_FROM_ABI strstreambuf* rdbuf() const { return const_cast<strstreambuf*>(&__sb_); }
  _LIBCPP_HIDE_FROM_ABI char* str() { return __sb_.str(); }

private:
  strstreambuf __sb_;
};

class _LIBCPP_DEPRECATED _LIBCPP_EXPORTED_FROM_ABI ostrstream : public ostream {
public:
  _LIBCPP_HIDE_FROM_ABI ostrstream() : ostream(&__sb_) {}
  _LIBCPP_HIDE_FROM_ABI ostrstream(char* __s, int __n, ios_base::openmode __mode = ios_base::out)
      : ostream(&__sb_), __sb_(__s, __n, __s + (__mode & ios::app ? std::strlen(__s) : 0)) {}

#ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI ostrstream(ostrstream&& __rhs) // extension
      : ostream(std::move(static_cast<ostream&>(__rhs))), __sb_(std::move(__rhs.__sb_)) {
    ostream::set_rdbuf(&__sb_);
  }

  _LIBCPP_HIDE_FROM_ABI ostrstream& operator=(ostrstream&& __rhs) {
    __sb_ = std::move(__rhs.__sb_);
    ostream::operator=(std::move(__rhs));
    return *this;
  }
#endif // _LIBCPP_CXX03_LANG

  ~ostrstream() override;

  _LIBCPP_HIDE_FROM_ABI void swap(ostrstream& __rhs) {
    ostream::swap(__rhs);
    __sb_.swap(__rhs.__sb_);
  }

  _LIBCPP_HIDE_FROM_ABI strstreambuf* rdbuf() const { return const_cast<strstreambuf*>(&__sb_); }
  _LIBCPP_HIDE_FROM_ABI void freeze(bool __freezefl = true) { __sb_.freeze(__freezefl); }
  _LIBCPP_HIDE_FROM_ABI char* str() { return __sb_.str(); }
  _LIBCPP_HIDE_FROM_ABI int pcount() const { return __sb_.pcount(); }

private:
  strstreambuf __sb_; // exposition only
};

class _LIBCPP_DEPRECATED _LIBCPP_EXPORTED_FROM_ABI strstream : public iostream {
public:
  // Types
  typedef char char_type;
  typedef char_traits<char>::int_type int_type;
  typedef char_traits<char>::pos_type pos_type;
  typedef char_traits<char>::off_type off_type;

  // constructors/destructor
  _LIBCPP_HIDE_FROM_ABI strstream() : iostream(&__sb_) {}
  _LIBCPP_HIDE_FROM_ABI strstream(char* __s, int __n, ios_base::openmode __mode = ios_base::in | ios_base::out)
      : iostream(&__sb_), __sb_(__s, __n, __s + (__mode & ios::app ? std::strlen(__s) : 0)) {}

#ifndef _LIBCPP_CXX03_LANG
  _LIBCPP_HIDE_FROM_ABI strstream(strstream&& __rhs) // extension
      : iostream(std::move(static_cast<iostream&>(__rhs))), __sb_(std::move(__rhs.__sb_)) {
    iostream::set_rdbuf(&__sb_);
  }

  _LIBCPP_HIDE_FROM_ABI strstream& operator=(strstream&& __rhs) {
    __sb_ = std::move(__rhs.__sb_);
    iostream::operator=(std::move(__rhs));
    return *this;
  }
#endif // _LIBCPP_CXX03_LANG

  ~strstream() override;

  _LIBCPP_HIDE_FROM_ABI void swap(strstream& __rhs) {
    iostream::swap(__rhs);
    __sb_.swap(__rhs.__sb_);
  }

  // Members:
  _LIBCPP_HIDE_FROM_ABI strstreambuf* rdbuf() const { return const_cast<strstreambuf*>(&__sb_); }
  _LIBCPP_HIDE_FROM_ABI void freeze(bool __freezefl = true) { __sb_.freeze(__freezefl); }
  _LIBCPP_HIDE_FROM_ABI int pcount() const { return __sb_.pcount(); }
  _LIBCPP_HIDE_FROM_ABI char* str() { return __sb_.str(); }

private:
  strstreambuf __sb_; // exposition only
};

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STRSTREAM