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//===-- MICmnStreamStdinLinux.cpp --------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//++
// File: MIUtilStreamStdin.cpp
//
// Overview: CMICmnStreamStdinLinux implementation.
//
// Environment: Compilers: Visual C++ 12.
// gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
// Libraries: See MIReadmetxt.
//
// Copyright: None.
//--
// Third Party Headers:
#if !defined( _MSC_VER )
#include <sys/select.h>
#include <termios.h>
#endif // !defined( _MSC_VER )
#include <string.h> // For std::strerror()
// In-house headers:
#include "MICmnStreamStdinLinux.h"
#include "MICmnLog.h"
#include "MICmnResources.h"
#include "MIUtilSingletonHelper.h"
//++ ------------------------------------------------------------------------------------
// Details: CMICmnStreamStdinLinux constructor.
// Type: Method.
// Args: None.
// Return: None.
// Throws: None.
//--
CMICmnStreamStdinLinux::CMICmnStreamStdinLinux( void )
: m_constBufferSize( 1024 )
, m_pStdin( nullptr )
, m_pCmdBuffer( nullptr )
{
}
//++ ------------------------------------------------------------------------------------
// Details: CMICmnStreamStdinLinux destructor.
// Type: Overridable.
// Args: None.
// Return: None.
// Throws: None.
//--
CMICmnStreamStdinLinux::~CMICmnStreamStdinLinux( void )
{
Shutdown();
}
//++ ------------------------------------------------------------------------------------
// Details: Initialize resources for *this Stdin stream.
// Type: Method.
// Args: None.
// Return: MIstatus::success - Functional succeeded.
// MIstatus::failure - Functional failed.
// Throws: None.
//--
bool CMICmnStreamStdinLinux::Initialize( void )
{
if( m_bInitialized )
return MIstatus::success;
bool bOk = MIstatus::success;
CMIUtilString errMsg;
// Note initialisation order is important here as some resources depend on previous
MI::ModuleInit< CMICmnLog > ( IDS_MI_INIT_ERR_LOG , bOk, errMsg );
MI::ModuleInit< CMICmnResources >( IDS_MI_INIT_ERR_RESOURCES, bOk, errMsg );
// Other resources required
if( bOk )
{
m_pCmdBuffer = new MIchar[ m_constBufferSize ];
m_pStdin = stdin;
}
// Clear error indicators for std input
::clearerr( stdin );
m_bInitialized = bOk;
if( !bOk )
{
CMIUtilString strInitError( CMIUtilString::Format( MIRSRC( IDS_MI_INIT_ERR_OS_STDIN_HANDLER ), errMsg.c_str() ) );
SetErrorDescription( strInitError );
return MIstatus::failure;
}
return MIstatus::success;
}
//++ ------------------------------------------------------------------------------------
// Details: Release resources for *this Stdin stream.
// Type: Method.
// Args: None.
// Return: MIstatus::success - Functional succeeded.
// MIstatus::failure - Functional failed.
// Throws: None.
//--
bool CMICmnStreamStdinLinux::Shutdown( void )
{
if( !m_bInitialized )
return MIstatus::success;
m_bInitialized = false;
ClrErrorDescription();
bool bOk = MIstatus::success;
CMIUtilString errMsg;
// Tidy up
if( m_pCmdBuffer != nullptr )
{
delete [] m_pCmdBuffer;
m_pCmdBuffer = nullptr;
}
m_pStdin = nullptr;
// Note shutdown order is important here
MI::ModuleShutdown< CMICmnResources >( IDS_MI_INIT_ERR_RESOURCES, bOk, errMsg );
MI::ModuleShutdown< CMICmnLog > ( IDS_MI_INIT_ERR_LOG , bOk, errMsg );
if( !bOk )
{
SetErrorDescriptionn( MIRSRC( IDS_MI_SHTDWN_ERR_OS_STDIN_HANDLER ), errMsg.c_str() );
}
return MIstatus::success;
}
//++ ------------------------------------------------------------------------------------
// Details: Determine if stdin has any characters present in its buffer.
// Type: Method.
// Args: vwbAvail - (W) True = There is chars available, false = nothing there.
// Return: MIstatus::success - Functional succeeded.
// MIstatus::failure - Functional failed.
// Throws: None.
//--
bool CMICmnStreamStdinLinux::InputAvailable( bool & vwbAvail )
{
/* AD: Not used ATM but could come in handy just in case we need to do
this, poll for input
static const int STDIN = 0;
static bool bInitialized = false;
if( !bInitialized )
{
// Use termios to turn off line buffering
::termios term;
::tcgetattr( STDIN, &term );
::term.c_lflag &= ~ICANON;
::tcsetattr( STDIN, TCSANOW, &term );
::setbuf( stdin, NULL );
bInitialized = true;
}
int nBytesWaiting;
::ioctl( STDIN, FIONREAD, &nBytesWaiting );
vwbAvail = (nBytesWaiting > 0);
return MIstatus::success;
*/
return MIstatus::success;
}
//++ ------------------------------------------------------------------------------------
// Details: Wait on new line of data from stdin stream (completed by '\n' or '\r').
// Type: Method.
// Args: vwErrMsg - (W) Empty string ok or error description.
// Return: MIchar * - text buffer pointer or NULL on failure.
// Throws: None.
//--
const MIchar * CMICmnStreamStdinLinux::ReadLine( CMIUtilString & vwErrMsg )
{
vwErrMsg.clear();
// Read user input
const MIchar * pText = ::fgets( &m_pCmdBuffer[ 0 ], m_constBufferSize, stdin );
if( pText == nullptr )
{
if( ::ferror( m_pStdin ) != 0 )
vwErrMsg = ::strerror( errno );
return nullptr;
}
// Strip off new line characters
for( MIchar * pI = m_pCmdBuffer; *pI != '\0'; pI++ )
{
if( (*pI == '\n') || (*pI == '\r') )
{
*pI = '\0';
break;
}
}
return pText;
}
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