Fixed con_passive allowing STDIN while playing Quake 3 (ioquake3)

con_passive.c

// REMEMBER: Change SUBSYSTEM:WINDOWS to SUBSYSTEM:CONSOLE
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

#include "../qcommon/q_shared.h"
#include "../qcommon/qcommon.h"
#include "sys_local.h"

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>


HANDLE handleThread = NULL;
DWORD   threadID = 0;
char *gotMsg = NULL;

/*
==================
CON_Shutdown
==================
*/
void CON_Shutdown( void )
{
  TerminateThread(handleThread, NULL);
}

DWORD WINAPI threadCheckInput( LPVOID lpParam ) {
  char input[1024];  
  while (1) {
    prompt(input, sizeof input);
    //printf("got line: %s", input);
    gotMsg = input;
  }
}

/*
==================
CON_Init
==================
*/
void CON_Init( void )
{
  handleThread = CreateThread( 
    NULL,              // default security attributes
    0,                 // use default stack size  
    threadCheckInput,  // thread function name
    NULL,              // argument to thread function 
    0,                 // use default creation flags 
    &threadID          // returns the thread identifier
  );
  printf("CON_Init> created thread: %d\n", handleThread);
}

// P3t3r from JK Discord (a bit modified by kungfooman)
int prompt(char *input, const int MAX_SIZE) {
    int i = 0;
    char ch = '\0';
    while (1) {
        ch = (char)getchar();
        if (ch == '\n' || ch == EOF) {
            break;
        } else if (i < (MAX_SIZE - 1)) {
            input[i++] = ch;
        }
    }
    input[i] = '\0';
    return i;
}

/*
==================
CON_Input
==================
*/

char *CON_Input( void )
{
  if (gotMsg) {
    char *tmp = gotMsg;
    gotMsg = NULL;
    return tmp;
  }
	return NULL;
}

/*
==================
CON_Print
==================
*/
void CON_Print( const char *msg )
{
	if( com_ansiColor && com_ansiColor->integer )
		Sys_AnsiColorPrint( msg );
	else
		fputs( msg, stderr );
}