Stdin_istream Class Reference

A stdin input stream based on IO_CACHE. More...

#include <basic_istream.h>

Inheritance diagram for Stdin_istream:

Public Member Functions
	Stdin_istream ()
	Stdin_istream (const Stdin_istream &)=delete
Stdin_istream &	operator= (const Stdin_istream &)=delete
	~Stdin_istream () override
bool	open (std::string *errmsg)
	Opens the stdin stream. More...
void	close ()
	Closes the stream. More...
ssize_t	read (unsigned char *buffer, size_t length) override
	Read some bytes from the input stream. More...
bool	skip (my_off_t bytes)
	Skip bytes data from the stdin stream. More...
Public Member Functions inherited from Basic_istream
virtual	~Basic_istream ()=default

Private Attributes
IO_CACHE	m_io_cache

Detailed Description

A stdin input stream based on IO_CACHE.

It provides a Basic_istream based on stdin.

Constructor & Destructor Documentation

Stdin_istream() [1/2]

Stdin_istream::Stdin_istream ( )

default

Stdin_istream() [2/2]

Stdin_istream::Stdin_istream ( const Stdin_istream &  )

delete

~Stdin_istream()

Stdin_istream::~Stdin_istream ( )

override

Member Function Documentation

close()

void Stdin_istream::close

(

)

Closes the stream.

It deinitializes IO_CACHE.

open()

bool Stdin_istream::open

(

std::string *

errmsg

)

Opens the stdin stream.

It initializes the IO_CACHE with stdin.

Parameters

[out]

errmsg

An error message is returned if any error happens.

operator=()

Stdin_istream & Stdin_istream::operator= ( const Stdin_istream &  )

delete

read()

ssize_t Stdin_istream::read ( unsigned char *  buffer, size_t  length  )

overridevirtual

Read some bytes from the input stream.

It should read exact 'length' bytes unless error happens or it reaches the end of the stream. It should block when reaching the end of a pipe that is not closed.

Parameters

[out]	buffer	Where data will be put in.
[in]	length	The number of bytes that you want to read. length should not be larger than max long.

Returns

Return values fall into three cases:

Return values

'length'	Read 'length' bytes successfully
>=0	Reach EOF, return the number of bytes actually read. It is between 0 and length-1.
-1	Error.

Implements Basic_istream.

skip()

bool Stdin_istream::skip

(

my_off_t

bytes

)

Skip bytes data from the stdin stream.

Parameters

[in]

bytes

How many bytes should be skipped

Member Data Documentation

m_io_cache

IO_CACHE Stdin_istream::m_io_cache

private

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The documentation for this class was generated from the following files:

• sql/basic_istream.h
• sql/basic_istream.cc