Public Types¶

typedef _CharT char_type
typedef traits_type::int_type int_type
typedef traits_type::off_type off_type
typedef traits_type::pos_type pos_type
typedef _Traits traits_type

Public Member Functions¶

stdio_sync_filebuf (std::__c_file *__f)
stdio_sync_filebuf (stdio_sync_filebuf &&__fb) noexcept
std::__c_file * file ()
locale getloc () const
Locale access. streamsize in_avail ()
Looking ahead into the stream. stdio_sync_filebuf & operator= (stdio_sync_filebuf &&__fb) noexcept
locale pubimbue (const locale &__loc)
Entry point for imbue(). int_type sbumpc ()
Getting the next character. int_type sgetc ()
Getting the next character. streamsize sgetn (char_type *__s, streamsize __n)
Entry point for xsgetn. int_type snextc ()
Getting the next character. int_type sputbackc (char_type __c)
Pushing characters back into the input stream. int_type sputc (char_type __c)
Entry point for all single-character output functions. streamsize sputn (const char_type *__s, streamsize __n)
Entry point for all single-character output functions. int_type sungetc ()
Moving backwards in the input stream. void swap (stdio_sync_filebuf &__fb)

basic_streambuf * pubsetbuf (char_type *__s, streamsize __n)
Entry points for derived buffer functions. pos_type pubseekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out)
Alters the stream position. pos_type pubseekpos (pos_type __sp, ios_base::openmode __mode=ios_base::in|ios_base::out)
Alters the stream position. int pubsync ()
Calls virtual sync function.

Protected Member Functions¶

void __safe_gbump (streamsize __n)
void __safe_pbump (streamsize __n)
void gbump (int __n)
Moving the read position. virtual void imbue (const locale &__loc)
Changes translations. virtual int_type overflow (int_type __c=traits_type::eof())
virtual int_type overflow (int_type __c=traits_type::eof())
Consumes data from the buffer; writes to the controlled sequence. virtual int_type pbackfail (int_type __c=traits_type::eof())
virtual int_type pbackfail (int_type __c=traits_type::eof())
Tries to back up the input sequence. void pbump (int __n)
Moving the write position. virtual pos_type seekoff (off_type, ios_base::seekdir, ios_base::openmode=ios_base::in|ios_base::out)
Alters the stream positions. virtual std::streampos seekoff (std::streamoff __off, std::ios_base::seekdir __dir, std::ios_base::openmode=std::ios_base::in|std::ios_base::out)
virtual std::streampos seekpos (std::streampos __pos, std::ios_base::openmode __mode=std::ios_base::in|std::ios_base::out)
Alters the stream positions. virtual basic_streambuf< char_type, std::char_traits< _CharT > > * setbuf (char_type *, streamsize)
Manipulates the buffer. void setg (char_type *__gbeg, char_type *__gnext, char_type *__gend)
Setting the three read area pointers. void setp (char_type *__pbeg, char_type *__pend)
Setting the three write area pointers. virtual streamsize showmanyc ()
Investigating the data available. void swap (basic_streambuf &__sb)
virtual int sync ()
Synchronizes the buffer arrays with the controlled sequences. int_type syncgetc ()
stdio_sync_filebuf< char >::int_type syncgetc ()
stdio_sync_filebuf< wchar_t >::int_type syncgetc ()
int_type syncputc (int_type __c)
stdio_sync_filebuf< char >::int_type syncputc (int_type __c)
stdio_sync_filebuf< wchar_t >::int_type syncputc (int_type __c)
int_type syncungetc (int_type __c)
stdio_sync_filebuf< char >::int_type syncungetc (int_type __c)
stdio_sync_filebuf< wchar_t >::int_type syncungetc (int_type __c)
virtual int_type uflow ()
Fetches more data from the controlled sequence. virtual int_type underflow ()
Fetches more data from the controlled sequence. std::streamsize xsgetn (char *__s, std::streamsize __n)
virtual std::streamsize xsgetn (char_type *__s, std::streamsize __n)
virtual streamsize xsgetn (char_type *__s, streamsize __n)
Multiple character extraction. std::streamsize xsgetn (wchar_t *__s, std::streamsize __n)
std::streamsize xsputn (const char *__s, std::streamsize __n)
virtual std::streamsize xsputn (const char_type *__s, std::streamsize __n)
virtual streamsize xsputn (const char_type *__s, streamsize __n)
Multiple character insertion. std::streamsize xsputn (const wchar_t *__s, std::streamsize __n)

char_type * eback () const
Access to the get area. char_type * gptr () const
Access to the get area. char_type * egptr () const
Access to the get area.

char_type * pbase () const
Access to the put area. char_type * pptr () const
Access to the put area. char_type * epptr () const
Access to the put area.

Protected Attributes¶

locale _M_buf_locale
Current locale setting. char_type * _M_in_beg
Start of get area. char_type * _M_in_cur
Current read area. char_type * _M_in_end
End of get area. char_type * _M_out_beg
Start of put area. char_type * _M_out_cur
Current put area. char_type * _M_out_end
End of put area.

template<typename _CharT, typename _Traits = std::char_traits<_CharT>>¶

class __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >" Provides a layer of compatibility for C.

This GNU extension provides extensions for working with standard C FILE*'s. It must be instantiated by the user with the type of character used in the file stream, e.g., stdio_filebuf<char>.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::eback () const [inline], [protected], [inherited]¶

Access to the get area. These functions are only available to other protected functions, including derived classes.

• eback() returns the beginning pointer for the input sequence
• gptr() returns the next pointer for the input sequence
• egptr() returns the end pointer for the input sequence

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::egptr () const [inline], [protected], [inherited]¶

Access to the get area. These functions are only available to other protected functions, including derived classes.

• eback() returns the beginning pointer for the input sequence
• gptr() returns the next pointer for the input sequence
• egptr() returns the end pointer for the input sequence

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::epptr () const [inline], [protected], [inherited]¶

Access to the put area. These functions are only available to other protected functions, including derived classes.

• pbase() returns the beginning pointer for the output sequence
• pptr() returns the next pointer for the output sequence
• epptr() returns the end pointer for the output sequence

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> std::__c_file* __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::file () [inline]¶

Returns

This function can be used to access the underlying C file pointer. Note that there is no way for the library to track what you do with the file, so be careful.

void std::basic_streambuf< _CharT, std::char_traits< _CharT > >::gbump (int __n) [inline], [protected], [inherited]¶

Moving the read position.

Parameters

This just advances the read position without returning any data.

locale std::basic_streambuf< _CharT, std::char_traits< _CharT > >::getloc () const [inline], [inherited]¶

Locale access.

Returns

If pubimbue(loc) has been called, then the most recent loc is returned. Otherwise the global locale in effect at the time of construction is returned.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::gptr () const [inline], [protected], [inherited]¶

Access to the get area. These functions are only available to other protected functions, including derived classes.

• eback() returns the beginning pointer for the input sequence
• gptr() returns the next pointer for the input sequence
• egptr() returns the end pointer for the input sequence

virtual void std::basic_streambuf< _CharT, std::char_traits< _CharT > >::imbue (const locale & __loc) [inline], [protected], [virtual], [inherited]¶

Changes translations.

Parameters

Translations done during I/O which depend on the current locale are changed by this call. The standard adds, Between invocations of this function a class derived from streambuf can safely cache results of calls to locale functions and to members of facets so obtained.

Note

Reimplemented in std::basic_filebuf< _CharT, std::char_traits< _CharT > >.

streamsize std::basic_streambuf< _CharT, std::char_traits< _CharT > >::in_avail () [inline], [inherited]¶

Looking ahead into the stream.

Returns

If a read position is available, returns the number of characters available for reading before the buffer must be refilled. Otherwise returns the derived showmanyc().

virtual int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::overflow (int_type __c = traits_type::eof()) [inline], [protected], [virtual], [inherited]¶

Consumes data from the buffer; writes to the controlled sequence.

Parameters

Returns

Informally, this function is called when the output buffer is full (or does not exist, as buffering need not actually be done). If a buffer exists, it is consumed, with some effect on the controlled sequence. (Typically, the buffer is written out to the sequence verbatim.) In either case, the character c is also written out, if __c is not eof().

For a formal definition of this function, see a good text such as Langer & Kreft, or [27.5.2.4.5]/3-7.

A functioning output streambuf can be created by overriding only this function (no buffer area will be used).

Note

virtual int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pbackfail (int_type __c = traits_type::eof()) [inline], [protected], [virtual], [inherited]¶

Tries to back up the input sequence.

Parameters

Returns

Postcondition

Note

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pbase () const [inline], [protected], [inherited]¶

Access to the put area. These functions are only available to other protected functions, including derived classes.

• pbase() returns the beginning pointer for the output sequence
• pptr() returns the next pointer for the output sequence
• epptr() returns the end pointer for the output sequence

void std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pbump (int __n) [inline], [protected], [inherited]¶

Moving the write position.

Parameters

This just advances the write position without returning any data.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pptr () const [inline], [protected], [inherited]¶

Access to the put area. These functions are only available to other protected functions, including derived classes.

• pbase() returns the beginning pointer for the output sequence
• pptr() returns the next pointer for the output sequence
• epptr() returns the end pointer for the output sequence

locale std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pubimbue (const locale & __loc) [inline], [inherited]¶

Entry point for imbue().

Parameters

Returns

Calls the derived imbue(__loc).

pos_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pubseekoff (off_type __off, ios_base::seekdir __way, ios_base::openmode __mode = ios_base::in | ios_base::out) [inline], [inherited]¶

Alters the stream position.

Parameters

Calls virtual seekoff function.

pos_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pubseekpos (pos_type __sp, ios_base::openmode __mode = ios_base::in | ios_base::out) [inline], [inherited]¶

Alters the stream position.

Parameters

Calls virtual seekpos function.

basic_streambuf* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pubsetbuf (char_type * __s, streamsize __n) [inline], [inherited]¶

Entry points for derived buffer functions. The public versions of pubfoo dispatch to the protected derived foo member functions, passing the arguments (if any) and returning the result unchanged.

int std::basic_streambuf< _CharT, std::char_traits< _CharT > >::pubsync () [inline], [inherited]¶

Calls virtual sync function.

int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::sbumpc () [inline], [inherited]¶

Getting the next character.

Returns

If the input read position is available, returns that character and increments the read pointer, otherwise calls and returns uflow().

virtual pos_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::seekoff (off_type, ios_base::seekdir, ios_base::openmode = ios_base::in | ios_base::out) [inline], [protected], [virtual], [inherited]¶

Alters the stream positions. Each derived class provides its own appropriate behavior.

Note

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual std::streampos __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::seekpos (std::streampos, std::ios_base::openmode = std::ios_base::in | std::ios_base::out) [inline], [protected], [virtual]¶

Alters the stream positions. Each derived class provides its own appropriate behavior.

Note

Reimplemented from std::basic_streambuf< _CharT, std::char_traits< _CharT > >.

References std::ios_base::beg.

virtual basic_streambuf<char_type,std::char_traits< _CharT > >* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::setbuf (char_type *, streamsize) [inline], [protected], [virtual], [inherited]¶

Manipulates the buffer. Each derived class provides its own appropriate behavior. See the next-to-last paragraph of https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering for more on this function.

Note

Reimplemented in std::basic_filebuf< _CharT, std::char_traits< _CharT > >.

void std::basic_streambuf< _CharT, std::char_traits< _CharT > >::setg (char_type * __gbeg, char_type * __gnext, char_type * __gend) [inline], [protected], [inherited]¶

Setting the three read area pointers.

Parameters

Postcondition

void std::basic_streambuf< _CharT, std::char_traits< _CharT > >::setp (char_type * __pbeg, char_type * __pend) [inline], [protected], [inherited]¶

Setting the three write area pointers.

Parameters

Postcondition

int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::sgetc () [inline], [inherited]¶

Getting the next character.

Returns

If the input read position is available, returns that character, otherwise calls and returns underflow(). Does not move the read position after fetching the character.

streamsize std::basic_streambuf< _CharT, std::char_traits< _CharT > >::sgetn (char_type * __s, streamsize __n) [inline], [inherited]¶

Entry point for xsgetn.

Parameters

Returns xsgetn(__s,__n). The effect is to fill __s[0] through __s[__n-1] with characters from the input sequence, if possible.

virtual streamsize std::basic_streambuf< _CharT, std::char_traits< _CharT > >::showmanyc () [inline], [protected], [virtual], [inherited]¶

Investigating the data available.

Returns

If it returns a positive value, then successive calls to underflow() will not return traits::eof() until at least that number of characters have been supplied. If showmanyc() returns -1, then calls to underflow() or uflow() will fail. [27.5.2.4.3]/1

Note

Reimplemented in std::basic_filebuf< _CharT, std::char_traits< _CharT > >.

int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::snextc () [inline], [inherited]¶

Getting the next character.

Returns

Calls sbumpc(), and if that function returns traits::eof(), so does this function. Otherwise, sgetc().

int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::sputbackc (char_type __c) [inline], [inherited]¶

Pushing characters back into the input stream.

Parameters

Returns

Similar to sungetc(), but __c is pushed onto the stream instead of the previous character. If successful, the next character fetched from the input stream will be __c.

int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::sputc (char_type __c) [inline], [inherited]¶

Entry point for all single-character output functions.

Parameters

Returns

One of two public output functions.

If a write position is available for the output sequence (i.e., the buffer is not full), stores __c in that position, increments the position, and returns traits::to_int_type(__c). If a write position is not available, returns overflow(__c).

streamsize std::basic_streambuf< _CharT, std::char_traits< _CharT > >::sputn (const char_type * __s, streamsize __n) [inline], [inherited]¶

Entry point for all single-character output functions.

Parameters

One of two public output functions.

Returns xsputn(__s,__n). The effect is to write __s[0] through __s[__n-1] to the output sequence, if possible.

int_type std::basic_streambuf< _CharT, std::char_traits< _CharT > >::sungetc () [inline], [inherited]¶

Moving backwards in the input stream.

Returns

If a putback position is available, this function decrements the input pointer and returns that character. Otherwise, calls and returns pbackfail(). The effect is to unget the last character gotten.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::sync (void) [inline], [protected], [virtual]¶

Synchronizes the buffer arrays with the controlled sequences.

Returns

Each derived class provides its own appropriate behavior, including the definition of failure.

Note

Reimplemented from std::basic_streambuf< _CharT, std::char_traits< _CharT > >.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int_type __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::uflow () [inline], [protected], [virtual]¶

Fetches more data from the controlled sequence.

Returns

Informally, this function does the same thing as underflow(), and in fact is required to call that function. It also returns the new character, like underflow() does. However, this function also moves the read position forward by one.

Reimplemented from std::basic_streambuf< _CharT, std::char_traits< _CharT > >.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> virtual int_type __gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >::underflow () [inline], [protected], [virtual]¶

Fetches more data from the controlled sequence.

Returns

Informally, this function is called when the input buffer is exhausted (or does not exist, as buffering need not actually be done). If a buffer exists, it is refilled. In either case, the next available character is returned, or traits::eof() to indicate a null pending sequence.

For a formal definition of the pending sequence, see a good text such as Langer & Kreft, or [27.5.2.4.3]/7-14.

A functioning input streambuf can be created by overriding only this function (no buffer area will be used). For an example, see https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html

Note

Reimplemented from std::basic_streambuf< _CharT, std::char_traits< _CharT > >.

streamsize std::basic_streambuf< _CharT, std::char_traits< _CharT > >::xsgetn (char_type * __s, streamsize __n) [protected], [virtual], [inherited]¶

Multiple character extraction.

Parameters

Returns

Fills __s[0] through __s[__n-1] with characters from the input sequence, as if by sbumpc(). Stops when either __n characters have been copied, or when traits::eof() would be copied.

It is expected that derived classes provide a more efficient implementation by overriding this definition.

Reimplemented in std::basic_filebuf< _CharT, std::char_traits< _CharT > >.

streamsize std::basic_streambuf< _CharT, std::char_traits< _CharT > >::xsputn (const char_type * __s, streamsize __n) [protected], [virtual], [inherited]¶

Multiple character insertion.

Parameters

Returns

Writes __s[0] through __s[__n-1] to the output sequence, as if by sputc(). Stops when either n characters have been copied, or when sputc() would return traits::eof().

It is expected that derived classes provide a more efficient implementation by overriding this definition.

Reimplemented in std::basic_filebuf< _CharT, std::char_traits< _CharT > >.

locale std::basic_streambuf< _CharT, std::char_traits< _CharT > >::_M_buf_locale [protected], [inherited]¶

Current locale setting.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::_M_in_beg [protected], [inherited]¶

Start of get area.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::_M_in_cur [protected], [inherited]¶

Current read area.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::_M_in_end [protected], [inherited]¶

End of get area.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::_M_out_beg [protected], [inherited]¶

Start of put area.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::_M_out_cur [protected], [inherited]¶

Current put area.

char_type* std::basic_streambuf< _CharT, std::char_traits< _CharT > >::_M_out_end [protected], [inherited]¶

End of put area.