path: root/code/qcommon/common.c

/*
===========================================================================
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
===========================================================================
*/
// common.c -- misc functions used in client and server

#include "q_shared.h"
#include "qcommon.h"
#include <setjmp.h>
#ifndef _WIN32
#include <netinet/in.h>
#include <sys/stat.h> // umask
#else
#include <winsock.h>
#endif

int demo_protocols[] =
{ 66, 67, 68, 0 };

#define MAX_NUM_ARGVS	50

#define MIN_DEDICATED_COMHUNKMEGS 1
#define MIN_COMHUNKMEGS		56
#define DEF_COMHUNKMEGS		64
#define DEF_COMZONEMEGS		24
#define XSTRING(x)				STRING(x)
#define STRING(x)					#x
#define DEF_COMHUNKMEGS_S	XSTRING(DEF_COMHUNKMEGS)
#define DEF_COMZONEMEGS_S	XSTRING(DEF_COMZONEMEGS)

int		com_argc;
char	*com_argv[MAX_NUM_ARGVS+1];

jmp_buf abortframe;		// an ERR_DROP occured, exit the entire frame


FILE *debuglogfile;
static fileHandle_t logfile;
fileHandle_t	com_journalFile;			// events are written here
fileHandle_t	com_journalDataFile;		// config files are written here

cvar_t	*com_speeds;
cvar_t	*com_developer;
cvar_t	*com_dedicated;
cvar_t	*com_timescale;
cvar_t	*com_fixedtime;
cvar_t	*com_dropsim;		// 0.0 to 1.0, simulated packet drops
cvar_t	*com_journal;
cvar_t	*com_maxfps;
cvar_t	*com_altivec;
cvar_t	*com_timedemo;
cvar_t	*com_sv_running;
cvar_t	*com_cl_running;
cvar_t	*com_logfile;		// 1 = buffer log, 2 = flush after each print
cvar_t	*com_showtrace;
cvar_t	*com_version;
cvar_t	*com_blood;
cvar_t	*com_buildScript;	// for automated data building scripts
cvar_t	*com_introPlayed;
cvar_t	*cl_paused;
cvar_t	*sv_paused;
cvar_t  *cl_packetdelay;
cvar_t  *sv_packetdelay;
cvar_t	*com_cameraMode;
cvar_t	*com_ansiColor;
cvar_t	*com_unfocused;
cvar_t	*com_maxfpsUnfocused;
cvar_t	*com_minimized;
cvar_t	*com_maxfpsMinimized;
cvar_t	*com_standalone;

// com_speeds times
int		time_game;
int		time_frontend;		// renderer frontend time
int		time_backend;		// renderer backend time

int			com_frameTime;
int			com_frameMsec;
int			com_frameNumber;

qboolean	com_errorEntered;
qboolean	com_fullyInitialized;

char	com_errorMessage[MAXPRINTMSG];

void Com_WriteConfig_f( void );
void CIN_CloseAllVideos( void );

//============================================================================

static char	*rd_buffer;
static int	rd_buffersize;
static void	(*rd_flush)( char *buffer );

void Com_BeginRedirect (char *buffer, int buffersize, void (*flush)( char *) )
{
	if (!buffer || !buffersize || !flush)
		return;
	rd_buffer = buffer;
	rd_buffersize = buffersize;
	rd_flush = flush;

	*rd_buffer = 0;
}

void Com_EndRedirect (void)
{
	if ( rd_flush ) {
		rd_flush(rd_buffer);
	}

	rd_buffer = NULL;
	rd_buffersize = 0;
	rd_flush = NULL;
}

/*
=============
Com_Printf

Both client and server can use this, and it will output
to the apropriate place.

A raw string should NEVER be passed as fmt, because of "%f" type crashers.
=============
*/
void QDECL Com_Printf( const char *fmt, ... ) {
	va_list		argptr;
	char		msg[MAXPRINTMSG];
  static qboolean opening_qconsole = qfalse;


	va_start (argptr,fmt);
	Q_vsnprintf (msg, sizeof(msg), fmt, argptr);
	va_end (argptr);

	if ( rd_buffer ) {
		if ((strlen (msg) + strlen(rd_buffer)) > (rd_buffersize - 1)) {
			rd_flush(rd_buffer);
			*rd_buffer = 0;
		}
		Q_strcat(rd_buffer, rd_buffersize, msg);
    // TTimo nooo .. that would defeat the purpose
		//rd_flush(rd_buffer);			
		//*rd_buffer = 0;
		return;
	}

#ifndef DEDICATED
	CL_ConsolePrint( msg );
#endif

	// echo to dedicated console and early console
	Sys_Print( msg );

	// logfile
	if ( com_logfile && com_logfile->integer ) {
    // TTimo: only open the qconsole.log if the filesystem is in an initialized state
    //   also, avoid recursing in the qconsole.log opening (i.e. if fs_debug is on)
		if ( !logfile && FS_Initialized() && !opening_qconsole) {
			struct tm *newtime;
			time_t aclock;

      opening_qconsole = qtrue;

			time( &aclock );
			newtime = localtime( &aclock );

			logfile = FS_FOpenFileWrite( "qconsole.log" );
			
			if(logfile)
			{
				Com_Printf( "logfile opened on %s\n", asctime( newtime ) );
			
				if ( com_logfile->integer > 1 )
				{
					// force it to not buffer so we get valid
					// data even if we are crashing
					FS_ForceFlush(logfile);
				}
			}
			else
			{
				Com_Printf("Opening qconsole.log failed!\n");
				Cvar_SetValue("logfile", 0);
			}

      opening_qconsole = qfalse;
		}
		if ( logfile && FS_Initialized()) {
			FS_Write(msg, strlen(msg), logfile);
		}
	}
}


/*
================
Com_DPrintf

A Com_Printf that only shows up if the "developer" cvar is set
================
*/
void QDECL Com_DPrintf( const char *fmt, ...) {
	va_list		argptr;
	char		msg[MAXPRINTMSG];
		
	if ( !com_developer || !com_developer->integer ) {
		return;			// don't confuse non-developers with techie stuff...
	}

	va_start (argptr,fmt);	
	Q_vsnprintf (msg, sizeof(msg), fmt, argptr);
	va_end (argptr);
	
	Com_Printf ("%s", msg);
}

/*
=============
Com_Error

Both client and server can use this, and it will
do the apropriate things.
=============
*/
void QDECL Com_Error( int code, const char *fmt, ... ) {
	va_list		argptr;
	static int	lastErrorTime;
	static int	errorCount;
	int			currentTime;

	Cvar_Set( "com_errorCode", va( "%i", code ) );

	// when we are running automated scripts, make sure we
	// know if anything failed
	if ( com_buildScript && com_buildScript->integer ) {
		code = ERR_FATAL;
	}

	// if we are getting a solid stream of ERR_DROP, do an ERR_FATAL
	currentTime = Sys_Milliseconds();
	if ( currentTime - lastErrorTime < 100 ) {
		if ( ++errorCount > 3 ) {
			code = ERR_FATAL;
		}
	} else {
		errorCount = 0;
	}
	lastErrorTime = currentTime;

	if ( com_errorEntered ) {
		Sys_Error( "recursive error after: %s", com_errorMessage );
	}
	com_errorEntered = qtrue;

	va_start (argptr,fmt);
	Q_vsnprintf (com_errorMessage, sizeof(com_errorMessage),fmt,argptr);
	va_end (argptr);

	if (code != ERR_DISCONNECT && code != ERR_NEED_CD)
		Cvar_Set("com_errorMessage", com_errorMessage);

	if (code == ERR_DISCONNECT || code == ERR_SERVERDISCONNECT) {
		SV_Shutdown( "Server disconnected" );
		CL_Disconnect( qtrue );
		VM_Forced_Unload_Start();
		CL_FlushMemory( );
		VM_Forced_Unload_Done();
		// make sure we can get at our local stuff
		FS_PureServerSetLoadedPaks("", "");
		com_errorEntered = qfalse;
		longjmp (abortframe, -1);
	} else if (code == ERR_DROP) {
		Com_Printf ("********************\nERROR: %s\n********************\n", com_errorMessage);
		SV_Shutdown (va("Server crashed: %s",  com_errorMessage));
		CL_Disconnect( qtrue );
		VM_Forced_Unload_Start();
		CL_FlushMemory( );
		VM_Forced_Unload_Done();
		FS_PureServerSetLoadedPaks("", "");
		com_errorEntered = qfalse;
		longjmp (abortframe, -1);
	} else if ( code == ERR_NEED_CD ) {
		SV_Shutdown( "Server didn't have CD" );
		if ( com_cl_running && com_cl_running->integer ) {
			CL_Disconnect( qtrue );
			VM_Forced_Unload_Start();
			CL_FlushMemory( );
			VM_Forced_Unload_Done();
			com_errorEntered = qfalse;
			CL_CDDialog();
		} else {
			Com_Printf("Server didn't have CD\n" );
		}
		FS_PureServerSetLoadedPaks("", "");
		longjmp (abortframe, -1);
	} else {
		CL_Shutdown ();
		SV_Shutdown (va("Server fatal crashed: %s", com_errorMessage));
	}

	Com_Shutdown ();

	Sys_Error ("%s", com_errorMessage);
}


/*
=============
Com_Quit_f

Both client and server can use this, and it will
do the apropriate things.
=============
*/
void Com_Quit_f( void ) {
	// don't try to shutdown if we are in a recursive error
	char *p = Cmd_Args( );
	if ( !com_errorEntered ) {
		SV_Shutdown (p[0] ? p : "Server quit");
		CL_Shutdown ();
		Com_Shutdown ();
		FS_Shutdown(qtrue);
	}
	Sys_Quit ();
}



/*
============================================================================

COMMAND LINE FUNCTIONS

+ characters seperate the commandLine string into multiple console
command lines.

All of these are valid:

quake3 +set test blah +map test
quake3 set test blah+map test
quake3 set test blah + map test

============================================================================
*/

#define	MAX_CONSOLE_LINES	32
int		com_numConsoleLines;
char	*com_consoleLines[MAX_CONSOLE_LINES];

/*
==================
Com_ParseCommandLine

Break it up into multiple console lines
==================
*/
void Com_ParseCommandLine( char *commandLine ) {
    int inq = 0;
    com_consoleLines[0] = commandLine;
    com_numConsoleLines = 1;

    while ( *commandLine ) {
        if (*commandLine == '"') {
            inq = !inq;
        }
        // look for a + seperating character
        // if commandLine came from a file, we might have real line seperators
        if ( (*commandLine == '+' && !inq) || *commandLine == '\n'  || *commandLine == '\r' ) {
            if ( com_numConsoleLines == MAX_CONSOLE_LINES ) {
                return;
            }
            com_consoleLines[com_numConsoleLines] = commandLine + 1;
            com_numConsoleLines++;
            *commandLine = 0;
        }
        commandLine++;
    }
}


/*
===================
Com_SafeMode

Check for "safe" on the command line, which will
skip loading of q3config.cfg
===================
*/
qboolean Com_SafeMode( void ) {
	int		i;

	for ( i = 0 ; i < com_numConsoleLines ; i++ ) {
		Cmd_TokenizeString( com_consoleLines[i] );
		if ( !Q_stricmp( Cmd_Argv(0), "safe" )
			|| !Q_stricmp( Cmd_Argv(0), "cvar_restart" ) ) {
			com_consoleLines[i][0] = 0;
			return qtrue;
		}
	}
	return qfalse;
}


/*
===============
Com_StartupVariable

Searches for command line parameters that are set commands.
If match is not NULL, only that cvar will be looked for.
That is necessary because cddir and basedir need to be set
before the filesystem is started, but all other sets should
be after execing the config and default.
===============
*/
void Com_StartupVariable( const char *match ) {
	int		i;
	char	*s;
	cvar_t	*cv;

	for (i=0 ; i < com_numConsoleLines ; i++) {
		Cmd_TokenizeString( com_consoleLines[i] );
		if ( strcmp( Cmd_Argv(0), "set" ) ) {
			continue;
		}

		s = Cmd_Argv(1);
		if ( !match || !strcmp( s, match ) ) {
			Cvar_Set( s, Cmd_Argv(2) );
			cv = Cvar_Get( s, "", 0 );
			cv->flags |= CVAR_USER_CREATED;
//			com_consoleLines[i] = 0;
		}
	}
}


/*
=================
Com_AddStartupCommands

Adds command line parameters as script statements
Commands are seperated by + signs

Returns qtrue if any late commands were added, which
will keep the demoloop from immediately starting
=================
*/
qboolean Com_AddStartupCommands( void ) {
	int		i;
	qboolean	added;

	added = qfalse;
	// quote every token, so args with semicolons can work
	for (i=0 ; i < com_numConsoleLines ; i++) {
		if ( !com_consoleLines[i] || !com_consoleLines[i][0] ) {
			continue;
		}

		// set commands already added with Com_StartupVariable
		if ( !Q_stricmpn( com_consoleLines[i], "set", 3 ) ) {
			continue;
		}

		added = qtrue;
		Cbuf_AddText( com_consoleLines[i] );
		Cbuf_AddText( "\n" );
	}

	return added;
}


//============================================================================

void Info_Print( const char *s ) {
	char	key[512];
	char	value[512];
	char	*o;
	int		l;

	if (*s == '\\')
		s++;
	while (*s)
	{
		o = key;
		while (*s && *s != '\\')
			*o++ = *s++;

		l = o - key;
		if (l < 20)
		{
			Com_Memset (o, ' ', 20-l);
			key[20] = 0;
		}
		else
			*o = 0;
		Com_Printf ("%s", key);

		if (!*s)
		{
			Com_Printf ("MISSING VALUE\n");
			return;
		}

		o = value;
		s++;
		while (*s && *s != '\\')
			*o++ = *s++;
		*o = 0;

		if (*s)
			s++;
		Com_Printf ("%s\n", value);
	}
}

/*
============
Com_StringContains
============
*/
char *Com_StringContains(char *str1, char *str2, int casesensitive) {
	int len, i, j;

	len = strlen(str1) - strlen(str2);
	for (i = 0; i <= len; i++, str1++) {
		for (j = 0; str2[j]; j++) {
			if (casesensitive) {
				if (str1[j] != str2[j]) {
					break;
				}
			}
			else {
				if (toupper(str1[j]) != toupper(str2[j])) {
					break;
				}
			}
		}
		if (!str2[j]) {
			return str1;
		}
	}
	return NULL;
}

/*
============
Com_Filter
============
*/
int Com_Filter(char *filter, char *name, int casesensitive)
{
	char buf[MAX_TOKEN_CHARS];
	char *ptr;
	int i, found;

	while(*filter) {
		if (*filter == '*') {
			filter++;
			for (i = 0; *filter; i++) {
				if (*filter == '*' || *filter == '?') break;
				buf[i] = *filter;
				filter++;
			}
			buf[i] = '\0';
			if (strlen(buf)) {
				ptr = Com_StringContains(name, buf, casesensitive);
				if (!ptr) return qfalse;
				name = ptr + strlen(buf);
			}
		}
		else if (*filter == '?') {
			filter++;
			name++;
		}
		else if (*filter == '[' && *(filter+1) == '[') {
			filter++;
		}
		else if (*filter == '[') {
			filter++;
			found = qfalse;
			while(*filter && !found) {
				if (*filter == ']' && *(filter+1) != ']') break;
				if (*(filter+1) == '-' && *(filter+2) && (*(filter+2) != ']' || *(filter+3) == ']')) {
					if (casesensitive) {
						if (*name >= *filter && *name <= *(filter+2)) found = qtrue;
					}
					else {
						if (toupper(*name) >= toupper(*filter) &&
							toupper(*name) <= toupper(*(filter+2))) found = qtrue;
					}
					filter += 3;
				}
				else {
					if (casesensitive) {
						if (*filter == *name) found = qtrue;
					}
					else {
						if (toupper(*filter) == toupper(*name)) found = qtrue;
					}
					filter++;
				}
			}
			if (!found) return qfalse;
			while(*filter) {
				if (*filter == ']' && *(filter+1) != ']') break;
				filter++;
			}
			filter++;
			name++;
		}
		else {
			if (casesensitive) {
				if (*filter != *name) return qfalse;
			}
			else {
				if (toupper(*filter) != toupper(*name)) return qfalse;
			}
			filter++;
			name++;
		}
	}
	return qtrue;
}

/*
============
Com_FilterPath
============
*/
int Com_FilterPath(char *filter, char *name, int casesensitive)
{
	int i;
	char new_filter[MAX_QPATH];
	char new_name[MAX_QPATH];

	for (i = 0; i < MAX_QPATH-1 && filter[i]; i++) {
		if ( filter[i] == '\\' || filter[i] == ':' ) {
			new_filter[i] = '/';
		}
		else {
			new_filter[i] = filter[i];
		}
	}
	new_filter[i] = '\0';
	for (i = 0; i < MAX_QPATH-1 && name[i]; i++) {
		if ( name[i] == '\\' || name[i] == ':' ) {
			new_name[i] = '/';
		}
		else {
			new_name[i] = name[i];
		}
	}
	new_name[i] = '\0';
	return Com_Filter(new_filter, new_name, casesensitive);
}

/*
============
Com_HashKey
============
*/
int Com_HashKey(char *string, int maxlen) {
	int register hash, i;

	hash = 0;
	for (i = 0; i < maxlen && string[i] != '\0'; i++) {
		hash += string[i] * (119 + i);
	}
	hash = (hash ^ (hash >> 10) ^ (hash >> 20));
	return hash;
}

/*
================
Com_RealTime
================
*/
int Com_RealTime(qtime_t *qtime) {
	time_t t;
	struct tm *tms;

	t = time(NULL);
	if (!qtime)
		return t;
	tms = localtime(&t);
	if (tms) {
		qtime->tm_sec = tms->tm_sec;
		qtime->tm_min = tms->tm_min;
		qtime->tm_hour = tms->tm_hour;
		qtime->tm_mday = tms->tm_mday;
		qtime->tm_mon = tms->tm_mon;
		qtime->tm_year = tms->tm_year;
		qtime->tm_wday = tms->tm_wday;
		qtime->tm_yday = tms->tm_yday;
		qtime->tm_isdst = tms->tm_isdst;
	}
	return t;
}


/*
==============================================================================

						ZONE MEMORY ALLOCATION

There is never any space between memblocks, and there will never be two
contiguous free memblocks.

The rover can be left pointing at a non-empty block

The zone calls are pretty much only used for small strings and structures,
all big things are allocated on the hunk.
==============================================================================
*/

#define	ZONEID	0x1d4a11
#define MINFRAGMENT	64

typedef struct zonedebug_s {
	char *label;
	char *file;
	int line;
	int allocSize;
} zonedebug_t;

typedef struct memblock_s {
	int		size;           // including the header and possibly tiny fragments
	int     tag;            // a tag of 0 is a free block
	struct memblock_s       *next, *prev;
	int     id;        		// should be ZONEID
#ifdef ZONE_DEBUG
	zonedebug_t d;
#endif
} memblock_t;

typedef struct {
	int		size;			// total bytes malloced, including header
	int		used;			// total bytes used
	memblock_t	blocklist;	// start / end cap for linked list
	memblock_t	*rover;
} memzone_t;

// main zone for all "dynamic" memory allocation
memzone_t	*mainzone;
// we also have a small zone for small allocations that would only
// fragment the main zone (think of cvar and cmd strings)
memzone_t	*smallzone;

void Z_CheckHeap( void );

/*
========================
Z_ClearZone
========================
*/
void Z_ClearZone( memzone_t *zone, int size ) {
	memblock_t	*block;
	
	// set the entire zone to one free block

	zone->blocklist.next = zone->blocklist.prev = block =
		(memblock_t *)( (byte *)zone + sizeof(memzone_t) );
	zone->blocklist.tag = 1;	// in use block
	zone->blocklist.id = 0;
	zone->blocklist.size = 0;
	zone->rover = block;
	zone->size = size;
	zone->used = 0;
	
	block->prev = block->next = &zone->blocklist;
	block->tag = 0;			// free block
	block->id = ZONEID;
	block->size = size - sizeof(memzone_t);
}

/*
========================
Z_AvailableZoneMemory
========================
*/
int Z_AvailableZoneMemory( memzone_t *zone ) {
	return zone->size - zone->used;
}

/*
========================
Z_AvailableMemory
========================
*/
int Z_AvailableMemory( void ) {
	return Z_AvailableZoneMemory( mainzone );
}

/*
========================
Z_Free
========================
*/
void Z_Free( void *ptr ) {
	memblock_t	*block, *other;
	memzone_t *zone;
	
	if (!ptr) {
		Com_Error( ERR_DROP, "Z_Free: NULL pointer" );
	}

	block = (memblock_t *) ( (byte *)ptr - sizeof(memblock_t));
	if (block->id != ZONEID) {
		Com_Error( ERR_FATAL, "Z_Free: freed a pointer without ZONEID" );
	}
	if (block->tag == 0) {
		Com_Error( ERR_FATAL, "Z_Free: freed a freed pointer" );
	}
	// if static memory
	if (block->tag == TAG_STATIC) {
		return;
	}

	// check the memory trash tester
	if ( *(int *)((byte *)block + block->size - 4 ) != ZONEID ) {
		Com_Error( ERR_FATAL, "Z_Free: memory block wrote past end" );
	}

	if (block->tag == TAG_SMALL) {
		zone = smallzone;
	}
	else {
		zone = mainzone;
	}

	zone->used -= block->size;
	// set the block to something that should cause problems
	// if it is referenced...
	Com_Memset( ptr, 0xaa, block->size - sizeof( *block ) );

	block->tag = 0;		// mark as free
	
	other = block->prev;
	if (!other->tag) {
		// merge with previous free block
		other->size += block->size;
		other->next = block->next;
		other->next->prev = other;
		if (block == zone->rover) {
			zone->rover = other;
		}
		block = other;
	}

	zone->rover = block;

	other = block->next;
	if ( !other->tag ) {
		// merge the next free block onto the end
		block->size += other->size;
		block->next = other->next;
		block->next->prev = block;
		if (other == zone->rover) {
			zone->rover = block;
		}
	}
}


/*
================
Z_FreeTags
================
*/
void Z_FreeTags( int tag ) {
	int			count;
	memzone_t	*zone;

	if ( tag == TAG_SMALL ) {
		zone = smallzone;
	}
	else {
		zone = mainzone;
	}
	count = 0;
	// use the rover as our pointer, because
	// Z_Free automatically adjusts it
	zone->rover = zone->blocklist.next;
	do {
		if ( zone->rover->tag == tag ) {
			count++;
			Z_Free( (void *)(zone->rover + 1) );
			continue;
		}
		zone->rover = zone->rover->next;
	} while ( zone->rover != &zone->blocklist );
}


/*
================
Z_TagMalloc
================
*/
#ifdef ZONE_DEBUG
void *Z_TagMallocDebug( int size, int tag, char *label, char *file, int line ) {
#else
void *Z_TagMalloc( int size, int tag ) {
#endif
	int		extra, allocSize;
	memblock_t	*start, *rover, *new, *base;
	memzone_t *zone;

	if (!tag) {
		Com_Error( ERR_FATAL, "Z_TagMalloc: tried to use a 0 tag" );
	}

	if ( tag == TAG_SMALL ) {
		zone = smallzone;
	}
	else {
		zone = mainzone;
	}

	allocSize = size;
	//
	// scan through the block list looking for the first free block
	// of sufficient size
	//
	size += sizeof(memblock_t);	// account for size of block header
	size += 4;					// space for memory trash tester
	size = PAD(size, sizeof(intptr_t));		// align to 32/64 bit boundary
	
	base = rover = zone->rover;
	start = base->prev;
	
	do {
		if (rover == start)	{
#ifdef ZONE_DEBUG
			Z_LogHeap();
#endif
			// scaned all the way around the list
			Com_Error( ERR_FATAL, "Z_Malloc: failed on allocation of %i bytes from the %s zone",
								size, zone == smallzone ? "small" : "main");
			return NULL;
		}
		if (rover->tag) {
			base = rover = rover->next;
		} else {
			rover = rover->next;
		}
	} while (base->tag || base->size < size);
	
	//
	// found a block big enough
	//
	extra = base->size - size;
	if (extra > MINFRAGMENT) {
		// there will be a free fragment after the allocated block
		new = (memblock_t *) ((byte *)base + size );
		new->size = extra;
		new->tag = 0;			// free block
		new->prev = base;
		new->id = ZONEID;
		new->next = base->next;
		new->next->prev = new;
		base->next = new;
		base->size = size;
	}
	
	base->tag = tag;			// no longer a free block
	
	zone->rover = base->next;	// next allocation will start looking here
	zone->used += base->size;	//
	
	base->id = ZONEID;

#ifdef ZONE_DEBUG
	base->d.label = label;
	base->d.file = file;
	base->d.line = line;
	base->d.allocSize = allocSize;
#endif

	// marker for memory trash testing
	*(int *)((byte *)base + base->size - 4) = ZONEID;

	return (void *) ((byte *)base + sizeof(memblock_t));
}

/*
========================
Z_Malloc
========================
*/
#ifdef ZONE_DEBUG
void *Z_MallocDebug( int size, char *label, char *file, int line ) {
#else
void *Z_Malloc( int size ) {
#endif
	void	*buf;
	
  //Z_CheckHeap ();	// DEBUG

#ifdef ZONE_DEBUG
	buf = Z_TagMallocDebug( size, TAG_GENERAL, label, file, line );
#else
	buf = Z_TagMalloc( size, TAG_GENERAL );
#endif
	Com_Memset( buf, 0, size );

	return buf;
}

#ifdef ZONE_DEBUG
void *S_MallocDebug( int size, char *label, char *file, int line ) {
	return Z_TagMallocDebug( size, TAG_SMALL, label, file, line );
}
#else
void *S_Malloc( int size ) {
	return Z_TagMalloc( size, TAG_SMALL );
}
#endif

/*
========================
Z_CheckHeap
========================
*/
void Z_CheckHeap( void ) {
	memblock_t	*block;
	
	for (block = mainzone->blocklist.next ; ; block = block->next) {
		if (block->next == &mainzone->blocklist) {
			break;			// all blocks have been hit
		}
		if ( (byte *)block + block->size != (byte *)block->next)
			Com_Error( ERR_FATAL, "Z_CheckHeap: block size does not touch the next block\n" );
		if ( block->next->prev != block) {
			Com_Error( ERR_FATAL, "Z_CheckHeap: next block doesn't have proper back link\n" );
		}
		if ( !block->tag && !block->next->tag ) {
			Com_Error( ERR_FATAL, "Z_CheckHeap: two consecutive free blocks\n" );
		}
	}
}

/*
========================
Z_LogZoneHeap
========================
*/
void Z_LogZoneHeap( memzone_t *zone, char *name ) {
#ifdef ZONE_DEBUG
	char dump[32], *ptr;
	int  i, j;
#endif
	memblock_t	*block;
	char		buf[4096];
	int size, allocSize, numBlocks;

	if (!logfile || !FS_Initialized())
		return;
	size = allocSize = numBlocks = 0;
	Com_sprintf(buf, sizeof(buf), "\r\n================\r\n%s log\r\n================\r\n", name);
	FS_Write(buf, strlen(buf), logfile);
	for (block = zone->blocklist.next ; block->next != &zone->blocklist; block = block->next) {
		if (block->tag) {
#ifdef ZONE_DEBUG
			ptr = ((char *) block) + sizeof(memblock_t);
			j = 0;
			for (i = 0; i < 20 && i < block->d.allocSize; i++) {
				if (ptr[i] >= 32 && ptr[i] < 127) {
					dump[j++] = ptr[i];
				}
				else {
					dump[j++] = '_';
				}
			}
			dump[j] = '\0';
			Com_sprintf(buf, sizeof(buf), "size = %8d: %s, line: %d (%s) [%s]\r\n", block->d.allocSize, block->d.file, block->d.line, block->d.label, dump);
			FS_Write(buf, strlen(buf), logfile);
			allocSize += block->d.allocSize;
#endif
			size += block->size;
			numBlocks++;
		}
	}
#ifdef ZONE_DEBUG
	// subtract debug memory
	size -= numBlocks * sizeof(zonedebug_t);
#else
	allocSize = numBlocks * sizeof(memblock_t); // + 32 bit alignment
#endif
	Com_sprintf(buf, sizeof(buf), "%d %s memory in %d blocks\r\n", size, name, numBlocks);
	FS_Write(buf, strlen(buf), logfile);
	Com_sprintf(buf, sizeof(buf), "%d %s memory overhead\r\n", size - allocSize, name);
	FS_Write(buf, strlen(buf), logfile);
}

/*
========================
Z_LogHeap
========================
*/
void Z_LogHeap( void ) {
	Z_LogZoneHeap( mainzone, "MAIN" );
	Z_LogZoneHeap( smallzone, "SMALL" );
}

// static mem blocks to reduce a lot of small zone overhead
typedef struct memstatic_s {
	memblock_t b;
	byte mem[2];
} memstatic_t;

memstatic_t emptystring =
	{ {(sizeof(memblock_t)+2 + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'\0', '\0'} };
memstatic_t numberstring[] = {
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'0', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'1', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'2', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'3', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'4', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'5', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'6', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'7', '\0'} },
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'8', '\0'} }, 
	{ {(sizeof(memstatic_t) + 3) & ~3, TAG_STATIC, NULL, NULL, ZONEID}, {'9', '\0'} }
};

/*
========================
CopyString

 NOTE:	never write over the memory CopyString returns because
		memory from a memstatic_t might be returned
========================
*/
char *CopyString( const char *in ) {
	char	*out;

	if (!in[0]) {
		return ((char *)&emptystring) + sizeof(memblock_t);
	}
	else if (!in[1]) {
		if (in[0] >= '0' && in[0] <= '9') {
			return ((char *)&numberstring[in[0]-'0']) + sizeof(memblock_t);
		}
	}
	out = S_Malloc (strlen(in)+1);
	strcpy (out, in);
	return out;
}

/*
==============================================================================

Goals:
	reproducable without history effects -- no out of memory errors on weird map to map changes
	allow restarting of the client without fragmentation
	minimize total pages in use at run time
	minimize total pages needed during load time

  Single block of memory with stack allocators coming from both ends towards the middle.

  One side is designated the temporary memory allocator.

  Temporary memory can be allocated and freed in any order.

  A highwater mark is kept of the most in use at any time.

  When there is no temporary memory allocated, the permanent and temp sides
  can be switched, allowing the already touched temp memory to be used for
  permanent storage.

  Temp memory must never be allocated on two ends at once, or fragmentation
  could occur.

  If we have any in-use temp memory, additional temp allocations must come from
  that side.

  If not, we can choose to make either side the new temp side and push future
  permanent allocations to the other side.  Permanent allocations should be
  kept on the side that has the current greatest wasted highwater mark.

==============================================================================
*/


#define	HUNK_MAGIC	0x89537892
#define	HUNK_FREE_MAGIC	0x89537893

typedef struct {
	int		magic;
	int		size;
} hunkHeader_t;

typedef struct {
	int		mark;
	int		permanent;
	int		temp;
	int		tempHighwater;
} hunkUsed_t;

typedef struct hunkblock_s {
	int size;
	byte printed;
	struct hunkblock_s *next;
	char *label;
	char *file;
	int line;
} hunkblock_t;

static	hunkblock_t *hunkblocks;

static	hunkUsed_t	hunk_low, hunk_high;
static	hunkUsed_t	*hunk_permanent, *hunk_temp;

static	byte	*s_hunkData = NULL;
static	int		s_hunkTotal;

static	int		s_zoneTotal;
static	int		s_smallZoneTotal;


/*
=================
Com_Meminfo_f
=================
*/
void Com_Meminfo_f( void ) {
	memblock_t	*block;
	int			zoneBytes, zoneBlocks;
	int			smallZoneBytes, smallZoneBlocks;
	int			botlibBytes, rendererBytes;
	int			unused;

	zoneBytes = 0;
	botlibBytes = 0;
	rendererBytes = 0;
	zoneBlocks = 0;
	for (block = mainzone->blocklist.next ; ; block = block->next) {
		if ( Cmd_Argc() != 1 ) {
			Com_Printf ("block:%p    size:%7i    tag:%3i\n",
				(void *)block, block->size, block->tag);
		}
		if ( block->tag ) {
			zoneBytes += block->size;
			zoneBlocks++;
			if ( block->tag == TAG_BOTLIB ) {
				botlibBytes += block->size;
			} else if ( block->tag == TAG_RENDERER ) {
				rendererBytes += block->size;
			}
		}

		if (block->next == &mainzone->blocklist) {
			break;			// all blocks have been hit	
		}
		if ( (byte *)block + block->size != (byte *)block->next) {
			Com_Printf ("ERROR: block size does not touch the next block\n");
		}
		if ( block->next->prev != block) {
			Com_Printf ("ERROR: next block doesn't have proper back link\n");
		}
		if ( !block->tag && !block->next->tag ) {
			Com_Printf ("ERROR: two consecutive free blocks\n");
		}
	}

	smallZoneBytes = 0;
	smallZoneBlocks = 0;
	for (block = smallzone->blocklist.next ; ; block = block->next) {
		if ( block->tag ) {
			smallZoneBytes += block->size;
			smallZoneBlocks++;
		}

		if (block->next == &smallzone->blocklist) {
			break;			// all blocks have been hit	
		}
	}

	Com_Printf( "%8i bytes total hunk\n", s_hunkTotal );
	Com_Printf( "%8i bytes total zone\n", s_zoneTotal );
	Com_Printf( "\n" );
	Com_Printf( "%8i low mark\n", hunk_low.mark );
	Com_Printf( "%8i low permanent\n", hunk_low.permanent );
	if ( hunk_low.temp != hunk_low.permanent ) {
		Com_Printf( "%8i low temp\n", hunk_low.temp );
	}
	Com_Printf( "%8i low tempHighwater\n", hunk_low.tempHighwater );
	Com_Printf( "\n" );
	Com_Printf( "%8i high mark\n", hunk_high.mark );
	Com_Printf( "%8i high permanent\n", hunk_high.permanent );
	if ( hunk_high.temp != hunk_high.permanent ) {
		Com_Printf( "%8i high temp\n", hunk_high.temp );
	}
	Com_Printf( "%8i high tempHighwater\n", hunk_high.tempHighwater );
	Com_Printf( "\n" );
	Com_Printf( "%8i total hunk in use\n", hunk_low.permanent + hunk_high.permanent );
	unused = 0;
	if ( hunk_low.tempHighwater > hunk_low.permanent ) {
		unused += hunk_low.tempHighwater - hunk_low.permanent;
	}
	if ( hunk_high.tempHighwater > hunk_high.permanent ) {
		unused += hunk_high.tempHighwater - hunk_high.permanent;
	}
	Com_Printf( "%8i unused highwater\n", unused );
	Com_Printf( "\n" );
	Com_Printf( "%8i bytes in %i zone blocks\n", zoneBytes, zoneBlocks	);
	Com_Printf( "        %8i bytes in dynamic botlib\n", botlibBytes );
	Com_Printf( "        %8i bytes in dynamic renderer\n", rendererBytes );
	Com_Printf( "        %8i bytes in dynamic other\n", zoneBytes - ( botlibBytes + rendererBytes ) );
	Com_Printf( "        %8i bytes in small Zone memory\n", smallZoneBytes );
}

/*
===============
Com_TouchMemory

Touch all known used data to make sure it is paged in
===============
*/
void Com_TouchMemory( void ) {
	int		start, end;
	int		i, j;
	int		sum;
	memblock_t	*block;

	Z_CheckHeap();

	start = Sys_Milliseconds();

	sum = 0;

	j = hunk_low.permanent >> 2;
	for ( i = 0 ; i < j ; i+=64 ) {			// only need to touch each page
		sum += ((int *)s_hunkData)[i];
	}

	i = ( s_hunkTotal - hunk_high.permanent ) >> 2;
	j = hunk_high.permanent >> 2;
	for (  ; i < j ; i+=64 ) {			// only need to touch each page
		sum += ((int *)s_hunkData)[i];
	}

	for (block = mainzone->blocklist.next ; ; block = block->next) {
		if ( block->tag ) {
			j = block->size >> 2;
			for ( i = 0 ; i < j ; i+=64 ) {				// only need to touch each page
				sum += ((int *)block)[i];
			}
		}
		if ( block->next == &mainzone->blocklist ) {
			break;			// all blocks have been hit	
		}
	}

	end = Sys_Milliseconds();

	Com_Printf( "Com_TouchMemory: %i msec\n", end - start );
}



/*
=================
Com_InitZoneMemory
=================
*/
void Com_InitSmallZoneMemory( void ) {
	s_smallZoneTotal = 512 * 1024;
	smallzone = calloc( s_smallZoneTotal, 1 );
	if ( !smallzone ) {
		Com_Error( ERR_FATAL, "Small zone data failed to allocate %1.1f megs", (float)s_smallZoneTotal / (1024*1024) );
	}
	Z_ClearZone( smallzone, s_smallZoneTotal );
	
	return;
}

void Com_InitZoneMemory( void ) {
	cvar_t	*cv;

	//FIXME: 05/01/06 com_zoneMegs is useless right now as neither q3config.cfg nor
	// Com_StartupVariable have been executed by this point. The net result is that
	// s_zoneTotal will always be set to the default value.

	// allocate the random block zone
	cv = Cvar_Get( "com_zoneMegs", DEF_COMZONEMEGS_S, CVAR_LATCH | CVAR_ARCHIVE );

	if ( cv->integer < DEF_COMZONEMEGS ) {
		s_zoneTotal = 1024 * 1024 * DEF_COMZONEMEGS;
	} else {
		s_zoneTotal = cv->integer * 1024 * 1024;
	}

	mainzone = calloc( s_zoneTotal, 1 );
	if ( !mainzone ) {
		Com_Error( ERR_FATAL, "Zone data failed to allocate %i megs", s_zoneTotal / (1024*1024) );
	}
	Z_ClearZone( mainzone, s_zoneTotal );

}

/*
=================
Hunk_Log
=================
*/
void Hunk_Log( void) {
	hunkblock_t	*block;
	char		buf[4096];
	int size, numBlocks;

	if (!logfile || !FS_Initialized())
		return;
	size = 0;
	numBlocks = 0;
	Com_sprintf(buf, sizeof(buf), "\r\n================\r\nHunk log\r\n================\r\n");
	FS_Write(buf, strlen(buf), logfile);
	for (block = hunkblocks ; block; block = block->next) {
#ifdef HUNK_DEBUG
		Com_sprintf(buf, sizeof(buf), "size = %8d: %s, line: %d (%s)\r\n", block->size, block->file, block->line, block->label);
		FS_Write(buf, strlen(buf), logfile);
#endif
		size += block->size;
		numBlocks++;
	}
	Com_sprintf(buf, sizeof(buf), "%d Hunk memory\r\n", size);
	FS_Write(buf, strlen(buf), logfile);
	Com_sprintf(buf, sizeof(buf), "%d hunk blocks\r\n", numBlocks);
	FS_Write(buf, strlen(buf), logfile);
}

/*
=================
Hunk_SmallLog
=================
*/
void Hunk_SmallLog( void) {
	hunkblock_t	*block, *block2;
	char		buf[4096];
	int size, locsize, numBlocks;

	if (!logfile || !FS_Initialized())
		return;
	for (block = hunkblocks ; block; block = block->next) {
		block->printed = qfalse;
	}
	size = 0;
	numBlocks = 0;
	Com_sprintf(buf, sizeof(buf), "\r\n================\r\nHunk Small log\r\n================\r\n");
	FS_Write(buf, strlen(buf), logfile);
	for (block = hunkblocks; block; block = block->next) {
		if (block->printed) {
			continue;
		}
		locsize = block->size;
		for (block2 = block->next; block2; block2 = block2->next) {
			if (block->line != block2->line) {
				continue;
			}
			if (Q_stricmp(block->file, block2->file)) {
				continue;
			}
			size += block2->size;
			locsize += block2->size;
			block2->printed = qtrue;
		}
#ifdef HUNK_DEBUG
		Com_sprintf(buf, sizeof(buf), "size = %8d: %s, line: %d (%s)\r\n", locsize, block->file, block->line, block->label);
		FS_Write(buf, strlen(buf), logfile);
#endif
		size += block->size;
		numBlocks++;
	}
	Com_sprintf(buf, sizeof(buf), "%d Hunk memory\r\n", size);
	FS_Write(buf, strlen(buf), logfile);
	Com_sprintf(buf, sizeof(buf), "%d hunk blocks\r\n", numBlocks);
	FS_Write(buf, strlen(buf), logfile);
}

/*
=================
Com_InitZoneMemory
=================
*/
void Com_InitHunkMemory( void ) {
	cvar_t	*cv;
	int nMinAlloc;
	char *pMsg = NULL;

	// make sure the file system has allocated and "not" freed any temp blocks
	// this allows the config and product id files ( journal files too ) to be loaded
	// by the file system without redunant routines in the file system utilizing different 
	// memory systems
	if (FS_LoadStack() != 0) {
		Com_Error( ERR_FATAL, "Hunk initialization failed. File system load stack not zero");
	}

	// allocate the stack based hunk allocator
	cv = Cvar_Get( "com_hunkMegs", DEF_COMHUNKMEGS_S, CVAR_LATCH | CVAR_ARCHIVE );

	// if we are not dedicated min allocation is 56, otherwise min is 1
	if (com_dedicated && com_dedicated->integer) {
		nMinAlloc = MIN_DEDICATED_COMHUNKMEGS;
		pMsg = "Minimum com_hunkMegs for a dedicated server is %i, allocating %i megs.\n";
	}
	else {
		nMinAlloc = MIN_COMHUNKMEGS;
		pMsg = "Minimum com_hunkMegs is %i, allocating %i megs.\n";
	}

	if ( cv->integer < nMinAlloc ) {
		s_hunkTotal = 1024 * 1024 * nMinAlloc;
	    Com_Printf(pMsg, nMinAlloc, s_hunkTotal / (1024 * 1024));
	} else {
		s_hunkTotal = cv->integer * 1024 * 1024;
	}

	s_hunkData = calloc( s_hunkTotal + 31, 1 );
	if ( !s_hunkData ) {
		Com_Error( ERR_FATAL, "Hunk data failed to allocate %i megs", s_hunkTotal / (1024*1024) );
	}
	// cacheline align
	s_hunkData = (byte *) ( ( (intptr_t)s_hunkData + 31 ) & ~31 );
	Hunk_Clear();

	Cmd_AddCommand( "meminfo", Com_Meminfo_f );
#ifdef ZONE_DEBUG
	Cmd_AddCommand( "zonelog", Z_LogHeap );
#endif
#ifdef HUNK_DEBUG
	Cmd_AddCommand( "hunklog", Hunk_Log );
	Cmd_AddCommand( "hunksmalllog", Hunk_SmallLog );
#endif
}

/*
====================
Hunk_MemoryRemaining
====================
*/
int	Hunk_MemoryRemaining( void ) {
	int		low, high;

	low = hunk_low.permanent > hunk_low.temp ? hunk_low.permanent : hunk_low.temp;
	high = hunk_high.permanent > hunk_high.temp ? hunk_high.permanent : hunk_high.temp;

	return s_hunkTotal - ( low + high );
}

/*
===================
Hunk_SetMark

The server calls this after the level and game VM have been loaded
===================
*/
void Hunk_SetMark( void ) {
	hunk_low.mark = hunk_low.permanent;
	hunk_high.mark = hunk_high.permanent;
}

/*
=================
Hunk_ClearToMark

The client calls this before starting a vid_restart or snd_restart
=================
*/
void Hunk_ClearToMark( void ) {
	hunk_low.permanent = hunk_low.temp = hunk_low.mark;
	hunk_high.permanent = hunk_high.temp = hunk_high.mark;
}

/*
=================
Hunk_CheckMark
=================
*/
qboolean Hunk_CheckMark( void ) {
	if( hunk_low.mark || hunk_high.mark ) {
		return qtrue;
	}
	return qfalse;
}

void CL_ShutdownCGame( void );
void CL_ShutdownUI( void );
void SV_ShutdownGameProgs( void );

/*
=================
Hunk_Clear

The server calls this before shutting down or loading a new map
=================
*/
void Hunk_Clear( void ) {

#ifndef DEDICATED
	CL_ShutdownCGame();
	CL_ShutdownUI();
#endif
	SV_ShutdownGameProgs();
#ifndef DEDICATED
	CIN_CloseAllVideos();
#endif
	hunk_low.mark = 0;
	hunk_low.permanent = 0;
	hunk_low.temp = 0;
	hunk_low.tempHighwater = 0;

	hunk_high.mark = 0;
	hunk_high.permanent = 0;
	hunk_high.temp = 0;
	hunk_high.tempHighwater = 0;

	hunk_permanent = &hunk_low;
	hunk_temp = &hunk_high;

	Com_Printf( "Hunk_Clear: reset the hunk ok\n" );
	VM_Clear();
#ifdef HUNK_DEBUG
	hunkblocks = NULL;
#endif
}

static void Hunk_SwapBanks( void ) {
	hunkUsed_t	*swap;

	// can't swap banks if there is any temp already allocated
	if ( hunk_temp->temp != hunk_temp->permanent ) {
		return;
	}

	// if we have a larger highwater mark on this side, start making
	// our permanent allocations here and use the other side for temp
	if ( hunk_temp->tempHighwater - hunk_temp->permanent >
		hunk_permanent->tempHighwater - hunk_permanent->permanent ) {
		swap = hunk_temp;
		hunk_temp = hunk_permanent;
		hunk_permanent = swap;
	}
}

/*
=================
Hunk_Alloc

Allocate permanent (until the hunk is cleared) memory
=================
*/
#ifdef HUNK_DEBUG
void *Hunk_AllocDebug( int size, ha_pref preference, char *label, char *file, int line ) {
#else
void *Hunk_Alloc( int size, ha_pref preference ) {
#endif
	void	*buf;

	if ( s_hunkData == NULL)
	{
		Com_Error( ERR_FATAL, "Hunk_Alloc: Hunk memory system not initialized" );
	}

	// can't do preference if there is any temp allocated
	if (preference == h_dontcare || hunk_temp->temp != hunk_temp->permanent) {
		Hunk_SwapBanks();
	} else {
		if (preference == h_low && hunk_permanent != &hunk_low) {
			Hunk_SwapBanks();
		} else if (preference == h_high && hunk_permanent != &hunk_high) {
			Hunk_SwapBanks();
		}
	}

#ifdef HUNK_DEBUG
	size += sizeof(hunkblock_t);
#endif

	// round to cacheline
	size = (size+31)&~31;

	if ( hunk_low.temp + hunk_high.temp + size > s_hunkTotal ) {
#ifdef HUNK_DEBUG
		Hunk_Log();
		Hunk_SmallLog();
#endif
		Com_Error( ERR_DROP, "Hunk_Alloc failed on %i", size );
	}

	if ( hunk_permanent == &hunk_low ) {
		buf = (void *)(s_hunkData + hunk_permanent->permanent);
		hunk_permanent->permanent += size;
	} else {
		hunk_permanent->permanent += size;
		buf = (void *)(s_hunkData + s_hunkTotal - hunk_permanent->permanent );
	}

	hunk_permanent->temp = hunk_permanent->permanent;

	Com_Memset( buf, 0, size );

#ifdef HUNK_DEBUG
	{
		hunkblock_t *block;

		block = (hunkblock_t *) buf;
		block->size = size - sizeof(hunkblock_t);
		block->file = file;
		block->label = label;
		block->line = line;
		block->next = hunkblocks;
		hunkblocks = block;
		buf = ((byte *) buf) + sizeof(hunkblock_t);
	}
#endif
	return buf;
}

/*
=================
Hunk_AllocateTempMemory

This is used by the file loading system.
Multiple files can be loaded in temporary memory.
When the files-in-use count reaches zero, all temp memory will be deleted
=================
*/
void *Hunk_AllocateTempMemory( int size ) {
	void		*buf;
	hunkHeader_t	*hdr;

	// return a Z_Malloc'd block if the hunk has not been initialized
	// this allows the config and product id files ( journal files too ) to be loaded
	// by the file system without redunant routines in the file system utilizing different 
	// memory systems
	if ( s_hunkData == NULL )
	{
		return Z_Malloc(size);
	}

	Hunk_SwapBanks();

	size = PAD(size, sizeof(intptr_t)) + sizeof( hunkHeader_t );

	if ( hunk_temp->temp + hunk_permanent->permanent + size > s_hunkTotal ) {
		Com_Error( ERR_DROP, "Hunk_AllocateTempMemory: failed on %i", size );
	}

	if ( hunk_temp == &hunk_low ) {
		buf = (void *)(s_hunkData + hunk_temp->temp);
		hunk_temp->temp += size;
	} else {
		hunk_temp->temp += size;
		buf = (void *)(s_hunkData + s_hunkTotal - hunk_temp->temp );
	}

	if ( hunk_temp->temp > hunk_temp->tempHighwater ) {
		hunk_temp->tempHighwater = hunk_temp->temp;
	}

	hdr = (hunkHeader_t *)buf;
	buf = (void *)(hdr+1);

	hdr->magic = HUNK_MAGIC;
	hdr->size = size;

	// don't bother clearing, because we are going to load a file over it
	return buf;
}


/*
==================
Hunk_FreeTempMemory
==================
*/
void Hunk_FreeTempMemory( void *buf ) {
	hunkHeader_t	*hdr;

	  // free with Z_Free if the hunk has not been initialized
	  // this allows the config and product id files ( journal files too ) to be loaded
	  // by the file system without redunant routines in the file system utilizing different 
	  // memory systems
	if ( s_hunkData == NULL )
	{
		Z_Free(buf);
		return;
	}


	hdr = ( (hunkHeader_t *)buf ) - 1;
	if ( hdr->magic != HUNK_MAGIC ) {
		Com_Error( ERR_FATAL, "Hunk_FreeTempMemory: bad magic" );
	}

	hdr->magic = HUNK_FREE_MAGIC;

	// this only works if the files are freed in stack order,
	// otherwise the memory will stay around until Hunk_ClearTempMemory
	if ( hunk_temp == &hunk_low ) {
		if ( hdr == (void *)(s_hunkData + hunk_temp->temp - hdr->size ) ) {
			hunk_temp->temp -= hdr->size;
		} else {
			Com_Printf( "Hunk_FreeTempMemory: not the final block\n" );
		}
	} else {
		if ( hdr == (void *)(s_hunkData + s_hunkTotal - hunk_temp->temp ) ) {
			hunk_temp->temp -= hdr->size;
		} else {
			Com_Printf( "Hunk_FreeTempMemory: not the final block\n" );
		}
	}
}


/*
=================
Hunk_ClearTempMemory

The temp space is no longer needed.  If we have left more
touched but unused memory on this side, have future
permanent allocs use this side.
=================
*/
void Hunk_ClearTempMemory( void ) {
	if ( s_hunkData != NULL ) {
		hunk_temp->temp = hunk_temp->permanent;
	}
}

/*
=================
Hunk_Trash
=================
*/
void Hunk_Trash( void ) {
	int length, i, rnd;
	char *buf, value;

	return;

	if ( s_hunkData == NULL )
		return;

#ifdef _DEBUG
	Com_Error(ERR_DROP, "hunk trashed\n");
	return;
#endif

	Cvar_Set("com_jp", "1");
	Hunk_SwapBanks();

	if ( hunk_permanent == &hunk_low ) {
		buf = (void *)(s_hunkData + hunk_permanent->permanent);
	} else {
		buf = (void *)(s_hunkData + s_hunkTotal - hunk_permanent->permanent );
	}
	length = hunk_permanent->permanent;

	if (length > 0x7FFFF) {
		//randomly trash data within buf
		rnd = random() * (length - 0x7FFFF);
		value = 31;
		for (i = 0; i < 0x7FFFF; i++) {
			value *= 109;
			buf[rnd+i] ^= value;
		}
	}
}

/*
===================================================================

EVENTS AND JOURNALING

In addition to these events, .cfg files are also copied to the
journaled file
===================================================================
*/

#define	MAX_PUSHED_EVENTS	            1024
static int com_pushedEventsHead = 0;
static int com_pushedEventsTail = 0;
static sysEvent_t	com_pushedEvents[MAX_PUSHED_EVENTS];

/*
=================
Com_InitJournaling
=================
*/
void Com_InitJournaling( void ) {
	Com_StartupVariable( "journal" );
	com_journal = Cvar_Get ("journal", "0", CVAR_INIT);
	if ( !com_journal->integer ) {
		return;
	}

	if ( com_journal->integer == 1 ) {
		Com_Printf( "Journaling events\n");
		com_journalFile = FS_FOpenFileWrite( "journal.dat" );
		com_journalDataFile = FS_FOpenFileWrite( "journaldata.dat" );
	} else if ( com_journal->integer == 2 ) {
		Com_Printf( "Replaying journaled events\n");
		FS_FOpenFileRead( "journal.dat", &com_journalFile, qtrue );
		FS_FOpenFileRead( "journaldata.dat", &com_journalDataFile, qtrue );
	}

	if ( !com_journalFile || !com_journalDataFile ) {
		Cvar_Set( "com_journal", "0" );
		com_journalFile = 0;
		com_journalDataFile = 0;
		Com_Printf( "Couldn't open journal files\n" );
	}
}

/*
========================================================================

EVENT LOOP

========================================================================
*/

#define MAX_QUEUED_EVENTS  256
#define MASK_QUEUED_EVENTS ( MAX_QUEUED_EVENTS - 1 )

static sysEvent_t  eventQueue[ MAX_QUEUED_EVENTS ];
static int         eventHead = 0;
static int         eventTail = 0;
static byte        sys_packetReceived[ MAX_MSGLEN ];

/*
================
Com_QueueEvent

A time of 0 will get the current time
Ptr should either be null, or point to a block of data that can
be freed by the game later.
================
*/
void Com_QueueEvent( int time, sysEventType_t type, int value, int value2, int ptrLength, void *ptr )
{
	sysEvent_t  *ev;

	ev = &eventQueue[ eventHead & MASK_QUEUED_EVENTS ];

	if ( eventHead - eventTail >= MAX_QUEUED_EVENTS )
	{
		Com_Printf("Com_QueueEvent: overflow\n");
		// we are discarding an event, but don't leak memory
		if ( ev->evPtr )
		{
			Z_Free( ev->evPtr );
		}
		eventTail++;
	}

	eventHead++;

	if ( time == 0 )
	{
		time = Sys_Milliseconds();
	}

	ev->evTime = time;
	ev->evType = type;
	ev->evValue = value;
	ev->evValue2 = value2;
	ev->evPtrLength = ptrLength;
	ev->evPtr = ptr;
}

/*
================
Com_GetSystemEvent

================
*/
sysEvent_t Com_GetSystemEvent( void )
{
	sysEvent_t  ev;
	char        *s;
	msg_t       netmsg;
	netadr_t    adr;

	// return if we have data
	if ( eventHead > eventTail )
	{
		eventTail++;
		return eventQueue[ ( eventTail - 1 ) & MASK_QUEUED_EVENTS ];
	}

	// check for console commands
	s = Sys_ConsoleInput();
	if ( s )
	{
		char  *b;
		int   len;

		len = strlen( s ) + 1;
		b = Z_Malloc( len );
		strcpy( b, s );
		Com_QueueEvent( 0, SE_CONSOLE, 0, 0, len, b );
	}

	// check for network packets
	MSG_Init( &netmsg, sys_packetReceived, sizeof( sys_packetReceived ) );
	if ( Sys_GetPacket ( &adr, &netmsg ) )
	{
		netadr_t  *buf;
		int       len;

		// copy out to a seperate buffer for qeueing
		len = sizeof( netadr_t ) + netmsg.cursize;
		buf = Z_Malloc( len );
		*buf = adr;
		memcpy( buf+1, netmsg.data, netmsg.cursize );
		Com_QueueEvent( 0, SE_PACKET, 0, 0, len, buf );
	}

	// return if we have data
	if ( eventHead > eventTail )
	{
		eventTail++;
		return eventQueue[ ( eventTail - 1 ) & MASK_QUEUED_EVENTS ];
	}

	// create an empty event to return
	memset( &ev, 0, sizeof( ev ) );
	ev.evTime = Sys_Milliseconds();

	return ev;
}

/*
=================
Com_GetRealEvent
=================
*/
sysEvent_t	Com_GetRealEvent( void ) {
	int			r;
	sysEvent_t	ev;

	// either get an event from the system or the journal file
	if ( com_journal->integer == 2 ) {
		r = FS_Read( &ev, sizeof(ev), com_journalFile );
		if ( r != sizeof(ev) ) {
			Com_Error( ERR_FATAL, "Error reading from journal file" );
		}
		if ( ev.evPtrLength ) {
			ev.evPtr = Z_Malloc( ev.evPtrLength );
			r = FS_Read( ev.evPtr, ev.evPtrLength, com_journalFile );
			if ( r != ev.evPtrLength ) {
				Com_Error( ERR_FATAL, "Error reading from journal file" );
			}
		}
	} else {
		ev = Com_GetSystemEvent();

		// write the journal value out if needed
		if ( com_journal->integer == 1 ) {
			r = FS_Write( &ev, sizeof(ev), com_journalFile );
			if ( r != sizeof(ev) ) {
				Com_Error( ERR_FATAL, "Error writing to journal file" );
			}
			if ( ev.evPtrLength ) {
				r = FS_Write( ev.evPtr, ev.evPtrLength, com_journalFile );
				if ( r != ev.evPtrLength ) {
					Com_Error( ERR_FATAL, "Error writing to journal file" );
				}
			}
		}
	}

	return ev;
}


/*
=================
Com_InitPushEvent
=================
*/
void Com_InitPushEvent( void ) {
  // clear the static buffer array
  // this requires SE_NONE to be accepted as a valid but NOP event
  memset( com_pushedEvents, 0, sizeof(com_pushedEvents) );
  // reset counters while we are at it
  // beware: GetEvent might still return an SE_NONE from the buffer
  com_pushedEventsHead = 0;
  com_pushedEventsTail = 0;
}


/*
=================
Com_PushEvent
=================
*/
void Com_PushEvent( sysEvent_t *event ) {
	sysEvent_t		*ev;
	static int printedWarning = 0;

	ev = &com_pushedEvents[ com_pushedEventsHead & (MAX_PUSHED_EVENTS-1) ];

	if ( com_pushedEventsHead - com_pushedEventsTail >= MAX_PUSHED_EVENTS ) {

		// don't print the warning constantly, or it can give time for more...
		if ( !printedWarning ) {
			printedWarning = qtrue;
			Com_Printf( "WARNING: Com_PushEvent overflow\n" );
		}

		if ( ev->evPtr ) {
			Z_Free( ev->evPtr );
		}
		com_pushedEventsTail++;
	} else {
		printedWarning = qfalse;
	}

	*ev = *event;
	com_pushedEventsHead++;
}

/*
=================
Com_GetEvent
=================
*/
sysEvent_t	Com_GetEvent( void ) {
	if ( com_pushedEventsHead > com_pushedEventsTail ) {
		com_pushedEventsTail++;
		return com_pushedEvents[ (com_pushedEventsTail-1) & (MAX_PUSHED_EVENTS-1) ];
	}
	return Com_GetRealEvent();
}

/*
=================
Com_RunAndTimeServerPacket
=================
*/
void Com_RunAndTimeServerPacket( netadr_t *evFrom, msg_t *buf ) {
	int		t1, t2, msec;

	t1 = 0;

	if ( com_speeds->integer ) {
		t1 = Sys_Milliseconds ();
	}

	SV_PacketEvent( *evFrom, buf );

	if ( com_speeds->integer ) {
		t2 = Sys_Milliseconds ();
		msec = t2 - t1;
		if ( com_speeds->integer == 3 ) {
			Com_Printf( "SV_PacketEvent time: %i\n", msec );
		}
	}
}

/*
=================
Com_EventLoop

Returns last event time
=================
*/
int Com_EventLoop( void ) {
	sysEvent_t	ev;
	netadr_t	evFrom;
	byte		bufData[MAX_MSGLEN];
	msg_t		buf;

	MSG_Init( &buf, bufData, sizeof( bufData ) );

	while ( 1 ) {
		NET_FlushPacketQueue();
		ev = Com_GetEvent();

		// if no more events are available
		if ( ev.evType == SE_NONE ) {
			// manually send packet events for the loopback channel
			while ( NET_GetLoopPacket( NS_CLIENT, &evFrom, &buf ) ) {
				CL_PacketEvent( evFrom, &buf );
			}

			while ( NET_GetLoopPacket( NS_SERVER, &evFrom, &buf ) ) {
				// if the server just shut down, flush the events
				if ( com_sv_running->integer ) {
					Com_RunAndTimeServerPacket( &evFrom, &buf );
				}
			}

			return ev.evTime;
		}


		switch ( ev.evType ) {
		default:
			Com_Error( ERR_FATAL, "Com_EventLoop: bad event type %i", ev.evType );
			break;
        case SE_NONE:
            break;
		case SE_KEY:
			CL_KeyEvent( ev.evValue, ev.evValue2, ev.evTime );
			break;
		case SE_CHAR:
			CL_CharEvent( ev.evValue );
			break;
		case SE_MOUSE:
			CL_MouseEvent( ev.evValue, ev.evValue2, ev.evTime );
			break;
		case SE_JOYSTICK_AXIS:
			CL_JoystickEvent( ev.evValue, ev.evValue2, ev.evTime );
			break;
		case SE_CONSOLE:
			Cbuf_AddText( (char *)ev.evPtr );
			Cbuf_AddText( "\n" );
			break;
		case SE_PACKET:
			// this cvar allows simulation of connections that
			// drop a lot of packets.  Note that loopback connections
			// don't go through here at all.
			if ( com_dropsim->value > 0 ) {
				static int seed;

				if ( Q_random( &seed ) < com_dropsim->value ) {
					break;		// drop this packet
				}
			}

			evFrom = *(netadr_t *)ev.evPtr;
			buf.cursize = ev.evPtrLength - sizeof( evFrom );

			// we must copy the contents of the message out, because
			// the event buffers are only large enough to hold the
			// exact payload, but channel messages need to be large
			// enough to hold fragment reassembly
			if ( (unsigned)buf.cursize > buf.maxsize ) {
				Com_Printf("Com_EventLoop: oversize packet\n");
				continue;
			}
			Com_Memcpy( buf.data, (byte *)((netadr_t *)ev.evPtr + 1), buf.cursize );
			if ( com_sv_running->integer ) {
				Com_RunAndTimeServerPacket( &evFrom, &buf );
			} else {
				CL_PacketEvent( evFrom, &buf );
			}
			break;
		}

		// free any block data
		if ( ev.evPtr ) {
			Z_Free( ev.evPtr );
		}
	}

	return 0;	// never reached
}

/*
================
Com_Milliseconds

Can be used for profiling, but will be journaled accurately
================
*/
int Com_Milliseconds (void) {
	sysEvent_t	ev;

	// get events and push them until we get a null event with the current time
	do {

		ev = Com_GetRealEvent();
		if ( ev.evType != SE_NONE ) {
			Com_PushEvent( &ev );
		}
	} while ( ev.evType != SE_NONE );
	
	return ev.evTime;
}

//============================================================================

/*
=============
Com_Error_f

Just throw a fatal error to
test error shutdown procedures
=============
*/
static void Com_Error_f (void) {
	if ( Cmd_Argc() > 1 ) {
		Com_Error( ERR_DROP, "Testing drop error" );
	} else {
		Com_Error( ERR_FATAL, "Testing fatal error" );
	}
}


/*
=============
Com_Freeze_f

Just freeze in place for a given number of seconds to test
error recovery
=============
*/
static void Com_Freeze_f (void) {
	float	s;
	int		start, now;

	if ( Cmd_Argc() != 2 ) {
		Com_Printf( "freeze <seconds>\n" );
		return;
	}
	s = atof( Cmd_Argv(1) );

	start = Com_Milliseconds();

	while ( 1 ) {
		now = Com_Milliseconds();
		if ( ( now - start ) * 0.001 > s ) {
			break;
		}
	}
}

/*
=================
Com_Crash_f

A way to force a bus error for development reasons
=================
*/
static void Com_Crash_f( void ) {
	* ( int * ) 0 = 0x12345678;
}

#ifndef STANDALONE

// TTimo: centralizing the cl_cdkey stuff after I discovered a buffer overflow problem with the dedicated server version
//   not sure it's necessary to have different defaults for regular and dedicated, but I don't want to risk it
//   https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=470
#ifndef DEDICATED
char	cl_cdkey[34] = "                                ";
#else
char	cl_cdkey[34] = "123456789";
#endif

/*
=================
Com_ReadCDKey
=================
*/
qboolean CL_CDKeyValidate( const char *key, const char *checksum );
void Com_ReadCDKey( const char *filename ) {
	fileHandle_t	f;
	char			buffer[33];
	char			fbuffer[MAX_OSPATH];

	sprintf(fbuffer, "%s/q3key", filename);

	FS_SV_FOpenFileRead( fbuffer, &f );
	if ( !f ) {
		Q_strncpyz( cl_cdkey, "                ", 17 );
		return;
	}

	Com_Memset( buffer, 0, sizeof(buffer) );

	FS_Read( buffer, 16, f );
	FS_FCloseFile( f );

	if (CL_CDKeyValidate(buffer, NULL)) {
		Q_strncpyz( cl_cdkey, buffer, 17 );
	} else {
		Q_strncpyz( cl_cdkey, "                ", 17 );
	}
}

/*
=================
Com_AppendCDKey
=================
*/
void Com_AppendCDKey( const char *filename ) {
	fileHandle_t	f;
	char			buffer[33];
	char			fbuffer[MAX_OSPATH];

	sprintf(fbuffer, "%s/q3key", filename);

	FS_SV_FOpenFileRead( fbuffer, &f );
	if (!f) {
		Q_strncpyz( &cl_cdkey[16], "                ", 17 );
		return;
	}

	Com_Memset( buffer, 0, sizeof(buffer) );

	FS_Read( buffer, 16, f );
	FS_FCloseFile( f );

	if (CL_CDKeyValidate(buffer, NULL)) {
		strcat( &cl_cdkey[16], buffer );
	} else {
		Q_strncpyz( &cl_cdkey[16], "                ", 17 );
	}
}

#ifndef DEDICATED
/*
=================
Com_WriteCDKey
=================
*/
static void Com_WriteCDKey( const char *filename, const char *ikey ) {
	fileHandle_t	f;
	char			fbuffer[MAX_OSPATH];
	char			key[17];
#ifndef _WIN32
	mode_t			savedumask;
#endif


	sprintf(fbuffer, "%s/q3key", filename);


	Q_strncpyz( key, ikey, 17 );

	if(!CL_CDKeyValidate(key, NULL) ) {
		return;
	}

#ifndef _WIN32
	savedumask = umask(0077);
#endif
	f = FS_SV_FOpenFileWrite( fbuffer );
	if ( !f ) {
		Com_Printf ("Couldn't write CD key to %s.\n", fbuffer );
		goto out;
	}

	FS_Write( key, 16, f );

	FS_Printf( f, "\n// generated by quake, do not modify\r\n" );
	FS_Printf( f, "// Do not give this file to ANYONE.\r\n" );
	FS_Printf( f, "// id Software and Activision will NOT ask you to send this file to them.\r\n");

	FS_FCloseFile( f );
out:
#ifndef _WIN32
	umask(savedumask);
#endif
	return;
}
#endif

#endif // STANDALONE

static void Com_DetectAltivec(void)
{
	// Only detect if user hasn't forcibly disabled it.
	if (com_altivec->integer) {
		static qboolean altivec = qfalse;
		static qboolean detected = qfalse;
		if (!detected) {
			altivec = ( Sys_GetProcessorFeatures( ) & CF_ALTIVEC );
			detected = qtrue;
		}

		if (!altivec) {
			Cvar_Set( "com_altivec", "0" );  // we don't have it! Disable support!
		}
	}
}


/*
=================
Com_Init
=================
*/
void Com_Init( char *commandLine ) {
	char	*s;
	int	qport;

	Com_Printf( "%s %s %s\n", Q3_VERSION, PLATFORM_STRING, __DATE__ );

	if ( setjmp (abortframe) ) {
		Sys_Error ("Error during initialization");
	}

	// Clear queues
	Com_Memset( &eventQueue[ 0 ], 0, MAX_QUEUED_EVENTS * sizeof( sysEvent_t ) );
	Com_Memset( &sys_packetReceived[ 0 ], 0, MAX_MSGLEN * sizeof( byte ) );

  // do this before anything else decides to push events
  Com_InitPushEvent();

	Com_InitSmallZoneMemory();
	Cvar_Init ();

	// prepare enough of the subsystems to handle
	// cvar and command buffer management
	Com_ParseCommandLine( commandLine );

//	Swap_Init ();
	Cbuf_Init ();

	Com_InitZoneMemory();
	Cmd_Init ();

	// override anything from the config files with command line args
	Com_StartupVariable( NULL );

	// get the developer cvar set as early as possible
	Com_StartupVariable( "developer" );

	// done early so bind command exists
	CL_InitKeyCommands();

	FS_InitFilesystem ();

	Com_InitJournaling();

	Cbuf_AddText ("exec default.cfg\n");

	// skip the q3config.cfg if "safe" is on the command line
	if ( !Com_SafeMode() ) {
		Cbuf_AddText ("exec " Q3CONFIG_CFG "\n");
	}

	Cbuf_AddText ("exec autoexec.cfg\n");

	Cbuf_Execute ();

	// override anything from the config files with command line args
	Com_StartupVariable( NULL );

  // get dedicated here for proper hunk megs initialization
#ifdef DEDICATED
	com_dedicated = Cvar_Get ("dedicated", "1", CVAR_INIT);
	Cvar_CheckRange( com_dedicated, 1, 2, qtrue );
#else
	com_dedicated = Cvar_Get ("dedicated", "0", CVAR_LATCH);
	Cvar_CheckRange( com_dedicated, 0, 2, qtrue );
#endif
	// allocate the stack based hunk allocator
	Com_InitHunkMemory();

	// if any archived cvars are modified after this, we will trigger a writing
	// of the config file
	cvar_modifiedFlags &= ~CVAR_ARCHIVE;

	//
	// init commands and vars
	//
	com_altivec = Cvar_Get ("com_altivec", "1", CVAR_ARCHIVE);
	com_maxfps = Cvar_Get ("com_maxfps", "85", CVAR_ARCHIVE);
	com_blood = Cvar_Get ("com_blood", "1", CVAR_ARCHIVE);

	com_developer = Cvar_Get ("developer", "0", CVAR_TEMP );
	com_logfile = Cvar_Get ("logfile", "0", CVAR_TEMP );

	com_timescale = Cvar_Get ("timescale", "1", CVAR_CHEAT | CVAR_SYSTEMINFO );
	com_fixedtime = Cvar_Get ("fixedtime", "0", CVAR_CHEAT);
	com_showtrace = Cvar_Get ("com_showtrace", "0", CVAR_CHEAT);
	com_dropsim = Cvar_Get ("com_dropsim", "0", CVAR_CHEAT);
	com_speeds = Cvar_Get ("com_speeds", "0", 0);
	com_timedemo = Cvar_Get ("timedemo", "0", CVAR_CHEAT);
	com_cameraMode = Cvar_Get ("com_cameraMode", "0", CVAR_CHEAT);

	cl_paused = Cvar_Get ("cl_paused", "0", CVAR_ROM);
	sv_paused = Cvar_Get ("sv_paused", "0", CVAR_ROM);
	cl_packetdelay = Cvar_Get ("cl_packetdelay", "0", CVAR_CHEAT);
	sv_packetdelay = Cvar_Get ("sv_packetdelay", "0", CVAR_CHEAT);
	com_sv_running = Cvar_Get ("sv_running", "0", CVAR_ROM);
	com_cl_running = Cvar_Get ("cl_running", "0", CVAR_ROM);
	com_buildScript = Cvar_Get( "com_buildScript", "0", 0 );
	com_ansiColor = Cvar_Get( "com_ansiColor", "0", CVAR_ARCHIVE );

	com_unfocused = Cvar_Get( "com_unfocused", "0", CVAR_ROM );
	com_maxfpsUnfocused = Cvar_Get( "com_maxfpsUnfocused", "0", CVAR_ARCHIVE );
	com_minimized = Cvar_Get( "com_minimized", "0", CVAR_ROM );
	com_maxfpsMinimized = Cvar_Get( "com_maxfpsMinimized", "0", CVAR_ARCHIVE );
	com_standalone = Cvar_Get( "com_standalone", "0", CVAR_INIT );

	com_introPlayed = Cvar_Get( "com_introplayed", "0", CVAR_ARCHIVE);

	if ( com_developer && com_developer->integer ) {
		Cmd_AddCommand ("error", Com_Error_f);
		Cmd_AddCommand ("crash", Com_Crash_f );
		Cmd_AddCommand ("freeze", Com_Freeze_f);
	}
	Cmd_AddCommand ("quit", Com_Quit_f);
	Cmd_AddCommand ("changeVectors", MSG_ReportChangeVectors_f );
	Cmd_AddCommand ("writeconfig", Com_WriteConfig_f );
	Cmd_SetCommandCompletionFunc( "writeconfig", Cmd_CompleteCfgName );

	s = va("%s %s %s", Q3_VERSION, PLATFORM_STRING, __DATE__ );
	com_version = Cvar_Get ("version", s, CVAR_ROM | CVAR_SERVERINFO );

	Sys_Init();

	// Pick a random port value
	Com_RandomBytes( (byte*)&qport, sizeof(int) );
	Netchan_Init( qport & 0xffff );

	VM_Init();
	SV_Init();

	com_dedicated->modified = qfalse;
#ifndef DEDICATED
	CL_Init();
#endif

	// set com_frameTime so that if a map is started on the
	// command line it will still be able to count on com_frameTime
	// being random enough for a serverid
	com_frameTime = Com_Milliseconds();

	// add + commands from command line
	if ( !Com_AddStartupCommands() ) {
		// if the user didn't give any commands, run default action
		if ( !com_dedicated->integer ) {
			Cbuf_AddText ("cinematic idlogo.RoQ\n");
			if( !com_introPlayed->integer ) {
				Cvar_Set( com_introPlayed->name, "1" );
				Cvar_Set( "nextmap", "cinematic intro.RoQ" );
			}
		}
	}

	// start in full screen ui mode
	Cvar_Set("r_uiFullScreen", "1");

	CL_StartHunkUsers( qfalse );

	// make sure single player is off by default
	Cvar_Set("ui_singlePlayerActive", "0");

	com_fullyInitialized = qtrue;

	// always set the cvar, but only print the info if it makes sense.
	Com_DetectAltivec();
#if idppc
	Com_Printf ("Altivec support is %s\n", com_altivec->integer ? "enabled" : "disabled");
#endif

	Com_Printf ("--- Common Initialization Complete ---\n");
}

//==================================================================

void Com_WriteConfigToFile( const char *filename ) {
	fileHandle_t	f;

	f = FS_FOpenFileWrite( filename );
	if ( !f ) {
		Com_Printf ("Couldn't write %s.\n", filename );
		return;
	}

	FS_Printf (f, "// generated by quake, do not modify\n");
	Key_WriteBindings (f);
	Cvar_WriteVariables (f);
	FS_FCloseFile( f );
}


/*
===============
Com_WriteConfiguration

Writes key bindings and archived cvars to config file if modified
===============
*/
void Com_WriteConfiguration( void ) {
#ifndef DEDICATED
	cvar_t	*fs;
#endif
	// if we are quiting without fully initializing, make sure
	// we don't write out anything
	if ( !com_fullyInitialized ) {
		return;
	}

	if ( !(cvar_modifiedFlags & CVAR_ARCHIVE ) ) {
		return;
	}
	cvar_modifiedFlags &= ~CVAR_ARCHIVE;

	Com_WriteConfigToFile( Q3CONFIG_CFG );

	// not needed for dedicated
#ifndef DEDICATED
	fs = Cvar_Get ("fs_game", "", CVAR_INIT|CVAR_SYSTEMINFO );
#ifndef STANDALONE
	if(!Cvar_VariableIntegerValue("com_standalone"))
	{
		if (UI_usesUniqueCDKey() && fs && fs->string[0] != 0) {
			Com_WriteCDKey( fs->string, &cl_cdkey[16] );
		} else {
			Com_WriteCDKey( BASEGAME, cl_cdkey );
		}
	}
#endif
#endif
}


/*
===============
Com_WriteConfig_f

Write the config file to a specific name
===============
*/
void Com_WriteConfig_f( void ) {
	char	filename[MAX_QPATH];

	if ( Cmd_Argc() != 2 ) {
		Com_Printf( "Usage: writeconfig <filename>\n" );
		return;
	}

	Q_strncpyz( filename, Cmd_Argv(1), sizeof( filename ) );
	COM_DefaultExtension( filename, sizeof( filename ), ".cfg" );
	Com_Printf( "Writing %s.\n", filename );
	Com_WriteConfigToFile( filename );
}

/*
================
Com_ModifyMsec
================
*/
int Com_ModifyMsec( int msec ) {
	int		clampTime;

	//
	// modify time for debugging values
	//
	if ( com_fixedtime->integer ) {
		msec = com_fixedtime->integer;
	} else if ( com_timescale->value ) {
		msec *= com_timescale->value;
	} else if (com_cameraMode->integer) {
		msec *= com_timescale->value;
	}
	
	// don't let it scale below 1 msec
	if ( msec < 1 && com_timescale->value) {
		msec = 1;
	}

	if ( com_dedicated->integer ) {
		// dedicated servers don't want to clamp for a much longer
		// period, because it would mess up all the client's views
		// of time.
		if (com_sv_running->integer && msec > 500)
			Com_Printf( "Hitch warning: %i msec frame time\n", msec );

		clampTime = 5000;
	} else 
	if ( !com_sv_running->integer ) {
		// clients of remote servers do not want to clamp time, because
		// it would skew their view of the server's time temporarily
		clampTime = 5000;
	} else {
		// for local single player gaming
		// we may want to clamp the time to prevent players from
		// flying off edges when something hitches.
		clampTime = 200;
	}

	if ( msec > clampTime ) {
		msec = clampTime;
	}

	return msec;
}

/*
=================
Com_Frame
=================
*/
void Com_Frame( void ) {

	int		msec, minMsec;
	static int	lastTime;
	int key;
 
	int		timeBeforeFirstEvents;
	int           timeBeforeServer;
	int           timeBeforeEvents;
	int           timeBeforeClient;
	int           timeAfter;
  




	if ( setjmp (abortframe) ) {
		return;			// an ERR_DROP was thrown
	}

	timeBeforeFirstEvents =0;
	timeBeforeServer =0;
	timeBeforeEvents =0;
	timeBeforeClient = 0;
	timeAfter = 0;


	// old net chan encryption key
	key = 0x87243987;

	// write config file if anything changed
	Com_WriteConfiguration(); 

	//
	// main event loop
	//
	if ( com_speeds->integer ) {
		timeBeforeFirstEvents = Sys_Milliseconds ();
	}

	// we may want to spin here if things are going too fast
	if ( !com_dedicated->integer && !com_timedemo->integer ) {
		if( com_minimized->integer && com_maxfpsMinimized->integer > 0 ) {
			minMsec = 1000 / com_maxfpsMinimized->integer;
		} else if( com_unfocused->integer && com_maxfpsUnfocused->integer > 0 ) {
			minMsec = 1000 / com_maxfpsUnfocused->integer;
		} else if( com_maxfps->integer > 0 ) {
			minMsec = 1000 / com_maxfps->integer;
		} else {
			minMsec = 1;
		}
	} else {
		minMsec = 1;
	}

	msec = minMsec;
	do {
		int timeRemaining = minMsec - msec;

		// The existing Sys_Sleep implementations aren't really
		// precise enough to be of use beyond 100fps
		// FIXME: implement a more precise sleep (RDTSC or something)
		if( timeRemaining >= 10 )
			Sys_Sleep( timeRemaining );

		com_frameTime = Com_EventLoop();
		if ( lastTime > com_frameTime ) {
			lastTime = com_frameTime;		// possible on first frame
		}
		msec = com_frameTime - lastTime;
	} while ( msec < minMsec );
	Cbuf_Execute ();

	if (com_altivec->modified)
	{
		Com_DetectAltivec();
		com_altivec->modified = qfalse;
	}

	lastTime = com_frameTime;

	// mess with msec if needed
	com_frameMsec = msec;
	msec = Com_ModifyMsec( msec );

	//
	// server side
	//
	if ( com_speeds->integer ) {
		timeBeforeServer = Sys_Milliseconds ();
	}

	SV_Frame( msec );

	// if "dedicated" has been modified, start up
	// or shut down the client system.
	// Do this after the server may have started,
	// but before the client tries to auto-connect
	if ( com_dedicated->modified ) {
		// get the latched value
		Cvar_Get( "dedicated", "0", 0 );
		com_dedicated->modified = qfalse;
		if ( !com_dedicated->integer ) {
			SV_Shutdown( "dedicated set to 0" );
			CL_FlushMemory();
		}
	}

#ifndef DEDICATED
	//
	// client system
	//
	//
	// run event loop a second time to get server to client packets
	// without a frame of latency
	//
	if ( com_speeds->integer ) {
		timeBeforeEvents = Sys_Milliseconds ();
	}
	Com_EventLoop();
	Cbuf_Execute ();


	//
	// client side
	//
	if ( com_speeds->integer ) {
		timeBeforeClient = Sys_Milliseconds ();
	}

	CL_Frame( msec );

	if ( com_speeds->integer ) {
		timeAfter = Sys_Milliseconds ();
	}
#endif

	//
	// report timing information
	//
	if ( com_speeds->integer ) {
		int			all, sv, ev, cl;

		all = timeAfter - timeBeforeServer;
		sv = timeBeforeEvents - timeBeforeServer;
		ev = timeBeforeServer - timeBeforeFirstEvents + timeBeforeClient - timeBeforeEvents;
		cl = timeAfter - timeBeforeClient;
		sv -= time_game;
		cl -= time_frontend + time_backend;

		Com_Printf ("frame:%i all:%3i sv:%3i ev:%3i cl:%3i gm:%3i rf:%3i bk:%3i\n", 
					 com_frameNumber, all, sv, ev, cl, time_game, time_frontend, time_backend );
	}	

	//
	// trace optimization tracking
	//
	if ( com_showtrace->integer ) {
	
		extern	int c_traces, c_brush_traces, c_patch_traces;
		extern	int	c_pointcontents;

		Com_Printf ("%4i traces  (%ib %ip) %4i points\n", c_traces,
			c_brush_traces, c_patch_traces, c_pointcontents);
		c_traces = 0;
		c_brush_traces = 0;
		c_patch_traces = 0;
		c_pointcontents = 0;
	}

	// old net chan encryption key
	key = lastTime * 0x87243987;

	com_frameNumber++;
}

/*
=================
Com_Shutdown
=================
*/
void Com_Shutdown (void) {
	if (logfile) {
		FS_FCloseFile (logfile);
		logfile = 0;
	}

	if ( com_journalFile ) {
		FS_FCloseFile( com_journalFile );
		com_journalFile = 0;
	}

}

//------------------------------------------------------------------------


/*
=====================
Q_acos

the msvc acos doesn't always return a value between -PI and PI:

int i;
i = 1065353246;
acos(*(float*) &i) == -1.#IND0

	This should go in q_math but it is too late to add new traps
	to game and ui
=====================
*/
float Q_acos(float c) {
	float angle;

	angle = acos(c);

	if (angle > M_PI) {
		return (float)M_PI;
	}
	if (angle < -M_PI) {
		return (float)M_PI;
	}
	return angle;
}

/*
===========================================
command line completion
===========================================
*/

/*
==================
Field_Clear
==================
*/
void Field_Clear( field_t *edit ) {
  memset(edit->buffer, 0, MAX_EDIT_LINE);
	edit->cursor = 0;
	edit->scroll = 0;
}

static const char *completionString;
static char shortestMatch[MAX_TOKEN_CHARS];
static int	matchCount;
// field we are working on, passed to Field_AutoComplete(&g_consoleCommand for instance)
static field_t *completionField;

/*
===============
FindMatches

===============
*/
static void FindMatches( const char *s ) {
	int		i;

	if ( Q_stricmpn( s, completionString, strlen( completionString ) ) ) {
		return;
	}
	matchCount++;
	if ( matchCount == 1 ) {
		Q_strncpyz( shortestMatch, s, sizeof( shortestMatch ) );
		return;
	}

	// cut shortestMatch to the amount common with s
	for ( i = 0 ; shortestMatch[i] ; i++ ) {
		if ( i >= strlen( s ) ) {
			shortestMatch[i] = 0;
			break;
		}

		if ( tolower(shortestMatch[i]) != tolower(s[i]) ) {
			shortestMatch[i] = 0;
		}
	}
}

/*
===============
PrintMatches

===============
*/
static void PrintMatches( const char *s ) {
	if ( !Q_stricmpn( s, shortestMatch, strlen( shortestMatch ) ) ) {
		Com_Printf( "    %s\n", s );
	}
}

/*
===============
PrintCvarMatches

===============
*/
static void PrintCvarMatches( const char *s ) {
	char value[ TRUNCATE_LENGTH ];

	if ( !Q_stricmpn( s, shortestMatch, strlen( shortestMatch ) ) ) {
		Com_TruncateLongString( value, Cvar_VariableString( s ) );
		Com_Printf( "    %s = \"%s\"\n", s, value );
	}
}

/*
===============
Field_FindFirstSeparator
===============
*/
static char *Field_FindFirstSeparator( char *s )
{
	int i;

	for( i = 0; i < strlen( s ); i++ )
	{
		if( s[ i ] == ';' )
			return &s[ i ];
	}

	return NULL;
}

/*
===============
Field_Complete
===============
*/
static qboolean Field_Complete( void )
{
	int completionOffset;

	if( matchCount == 0 )
		return qtrue;

	completionOffset = strlen( completionField->buffer ) - strlen( completionString );

	Q_strncpyz( &completionField->buffer[ completionOffset ], shortestMatch,
		sizeof( completionField->buffer ) - completionOffset );

	completionField->cursor = strlen( completionField->buffer );

	if( matchCount == 1 )
	{
		Q_strcat( completionField->buffer, sizeof( completionField->buffer ), " " );
		completionField->cursor++;
		return qtrue;
	}

	Com_Printf( "]%s\n", completionField->buffer );

	return qfalse;
}

#ifndef DEDICATED
/*
===============
Field_CompleteKeyname
===============
*/
void Field_CompleteKeyname( void )
{
	matchCount = 0;
	shortestMatch[ 0 ] = 0;

	Key_KeynameCompletion( FindMatches );

	if( !Field_Complete( ) )
		Key_KeynameCompletion( PrintMatches );
}
#endif

/*
===============
Field_CompleteFilename
===============
*/
void Field_CompleteFilename( const char *dir,
		const char *ext, qboolean stripExt )
{
	matchCount = 0;
	shortestMatch[ 0 ] = 0;

	FS_FilenameCompletion( dir, ext, stripExt, FindMatches );

	if( !Field_Complete( ) )
		FS_FilenameCompletion( dir, ext, stripExt, PrintMatches );
}

/*
===============
Field_CompleteCommand
===============
*/
void Field_CompleteCommand( char *cmd,
		qboolean doCommands, qboolean doCvars )
{
	int		completionArgument = 0;

	// Skip leading whitespace and quotes
	cmd = Com_SkipCharset( cmd, " \"" );

	Cmd_TokenizeStringIgnoreQuotes( cmd );
	completionArgument = Cmd_Argc( );

	// If there is trailing whitespace on the cmd
	if( *( cmd + strlen( cmd ) - 1 ) == ' ' )
	{
		completionString = "";
		completionArgument++;
	}
	else
		completionString = Cmd_Argv( completionArgument - 1 );

#ifndef DEDICATED
	// Unconditionally add a '\' to the start of the buffer
	if( completionField->buffer[ 0 ] &&
			completionField->buffer[ 0 ] != '\\' )
	{
		if( completionField->buffer[ 0 ] != '/' )
		{
			// Buffer is full, refuse to complete
			if( strlen( completionField->buffer ) + 1 >=
				sizeof( completionField->buffer ) )
				return;

			memmove( &completionField->buffer[ 1 ],
				&completionField->buffer[ 0 ],
				strlen( completionField->buffer ) + 1 );
			completionField->cursor++;
		}

		completionField->buffer[ 0 ] = '\\';
	}
#endif

	if( completionArgument > 1 )
	{
		const char *baseCmd = Cmd_Argv( 0 );
		char *p;

#ifndef DEDICATED
		// This should always be true
		if( baseCmd[ 0 ] == '\\' || baseCmd[ 0 ] == '/' )
			baseCmd++;
#endif

		if( ( p = Field_FindFirstSeparator( cmd ) ) )
			Field_CompleteCommand( p + 1, qtrue, qtrue ); // Compound command
		else
			Cmd_CompleteArgument( baseCmd, cmd, completionArgument ); 
	}
	else
	{
		if( completionString[0] == '\\' || completionString[0] == '/' )
			completionString++;

		matchCount = 0;
		shortestMatch[ 0 ] = 0;

		if( strlen( completionString ) == 0 )
			return;

		if( doCommands )
			Cmd_CommandCompletion( FindMatches );

		if( doCvars )
			Cvar_CommandCompletion( FindMatches );

		if( !Field_Complete( ) )
		{
			// run through again, printing matches
			if( doCommands )
				Cmd_CommandCompletion( PrintMatches );

			if( doCvars )
				Cvar_CommandCompletion( PrintCvarMatches );
		}
	}
}

/*
===============
Field_AutoComplete

Perform Tab expansion
===============
*/
void Field_AutoComplete( field_t *field )
{
	completionField = field;

	Field_CompleteCommand( completionField->buffer, qtrue, qtrue );
}

/*
==================
Com_RandomBytes

fills string array with len radom bytes, peferably from the OS randomizer
==================
*/
void Com_RandomBytes( byte *string, int len )
{
	int i;

	if( Sys_RandomBytes( string, len ) )
		return;

	Com_Printf( "Com_RandomBytes: using weak randomization\n" );
	srand( time( 0 ) );
	for( i = 0; i < len; i++ )
		string[i] = (unsigned char)( rand() % 255 );
}