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/*
*
* Copyright (C) 2000-2021, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: ofstd
*
* Author: Marco Eichelberg
*
* Purpose: Define alias for cout, cerr and clog
*
*/
#include "dcmtk/config/osconfig.h"
#include "dcmtk/ofstd/ofconsol.h"
#include "dcmtk/ofstd/ofthread.h"
#include <cassert>
#ifdef HAVE_UNISTD_H
BEGIN_EXTERN_C
#include <unistd.h>
END_EXTERN_C
#endif
BEGIN_EXTERN_C
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
END_EXTERN_C
#ifdef DCMTK_GUI
OFOStringStream COUT;
OFOStringStream CERR;
#endif
OFConsole::OFConsole()
#ifdef DCMTK_GUI
: currentCout(&COUT)
, currentCerr(&CERR)
#else
: currentCout(&STD_NAMESPACE cout)
, currentCerr(&STD_NAMESPACE cerr)
#endif
, joined(0)
#ifdef WITH_THREADS
, coutMutex()
, cerrMutex()
#endif
{
}
STD_NAMESPACE ostream *OFConsole::setCout(STD_NAMESPACE ostream *newCout)
{
lockCout();
STD_NAMESPACE ostream *tmpCout = currentCout;
#ifdef DCMTK_GUI
if (newCout) currentCout = newCout; else currentCout = &COUT;
#else
if (newCout) currentCout = newCout; else currentCout = &STD_NAMESPACE cout;
#endif
unlockCout();
return tmpCout;
}
STD_NAMESPACE ostream *OFConsole::setCerr(STD_NAMESPACE ostream *newCerr)
{
lockCerr();
STD_NAMESPACE ostream *tmpCerr = currentCerr;
#ifdef DCMTK_GUI
if (newCerr) currentCerr = newCerr; else currentCerr = &CERR;
#else
if (newCerr) currentCerr = newCerr; else currentCerr = &STD_NAMESPACE cerr;
#endif
unlockCerr();
return tmpCerr;
}
void OFConsole::join()
{
lockCerr();
if (!joined)
{
// changing the state of "joined" requires that both mutexes are locked.
// Mutexes must always be locked in the same order to avoid deadlocks.
lockCout();
joined = 1;
}
// now status is joined, so unlockCerr implicitly unlocks both mutexes
unlockCerr();
return;
}
void OFConsole::split()
{
lockCerr();
if (joined)
{
// since status is joined, lockCerr() has locked both mutexes
joined = 0;
// now status is unjoined, we have to unlock both mutexes manually
unlockCout();
}
unlockCerr();
return;
}
OFBool OFConsole::isJoined()
{
lockCerr();
// nobody will change "joined" if we have locked either mutex
int result = joined;
unlockCerr();
if (result) return OFTrue; else return OFFalse;
}
OFConsole& OFConsole::instance()
{
static OFConsole instance_;
return instance_;
}
int OFConsole::old_stderr = -1;
void OFConsole::mergeStderrStdout()
{
fflush(stderr);
if (fileno(stderr) != fileno(stdout))
{
/* duplicate the stderr file descriptor to be the same as stdout */
if (old_stderr < 0) old_stderr = dup(fileno(stderr));
/* now duplicate the file descriptor of stdout into the file descriptor of stderr.
* This will silently close the previous file descriptor of stderr.
*/
if (0 != dup2(fileno(stdout), fileno(stderr)))
{
OFConsole::instance().lockCerr() << "Unable to redirect stderr to stdout" << OFendl;
OFConsole::instance().unlockCerr();
}
}
#ifndef __BORLANDC__ /* setvbuf on stdout/stderr does not work with Borland C++ */
/* set stdout and stderr to unbuffered mode */
if (setvbuf(stdout, NULL, _IONBF, 0 ) != 0 )
{
OFConsole::instance().lockCerr() << "Unable to switch stdout to unbuffered mode" << OFendl;
OFConsole::instance().unlockCerr();
}
if (setvbuf(stderr, NULL, _IONBF, 0 ) != 0 )
{
OFConsole::instance().lockCerr() << "Unable to switch stderr to unbuffered mode" << OFendl;
OFConsole::instance().unlockCerr();
}
#endif /* __BORLANDC__ */
}
void OFConsole::unmergeStderrStdout()
{
/* only execute this code if stderr was actually redirected before */
if (old_stderr > 0)
{
if (0 != dup2(old_stderr, fileno(stderr)))
{
OFConsole::instance().lockCerr() << "Error: Unable to release redirection of stderr to stdout" << OFendl;
OFConsole::instance().unlockCerr();
}
#ifndef __BORLANDC__
/* switch stdout to buffered mode */
if (setvbuf(stdout, NULL, _IOFBF, BUFSIZ ) != 0 )
{
OFConsole::instance().lockCerr() << "Error: Unable to switch stdout to buffered mode" << OFendl;
OFConsole::instance().unlockCerr();
}
#endif /* __BORLANDC__ */
}
}
class OFConsoleInitializer
{
public:
OFConsoleInitializer()
{
OFConsole::instance();
}
};
/* the constructor of this global object makes sure
* that ofConsole is initialized before main starts.
* Required to make ofConsole thread-safe.
*/
OFConsoleInitializer ofConsoleInitializer;
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