q2pro/source/cvar.c

/*
Copyright (C) 1997-2001 Id Software, Inc.

This program 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.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// cvar.c -- dynamic variable tracking

#include "qcommon.h"

cvarAPI_t	cvar;

cvar_t	*cvar_vars;

uint32	cvar_latchedModified;
uint32	cvar_infoModified;

#define Cvar_Malloc( size )		Z_TagMalloc( size, TAG_CVAR )

#define CVARHASH_SIZE	256

static cvar_t *cvarHash[CVARHASH_SIZE];
static cvarSubsystem_t currentSubsystem;

static cvar_t	*cvar_silent;

/*
============
Cvar_FindVar
============
*/
cvar_t *Cvar_FindVar( const char *var_name ) {
	cvar_t	*var;
	int hash;

	hash = Com_HashString( var_name, CVARHASH_SIZE );

	for( var = cvarHash[hash]; var; var = var->hashNext ) {
		if( !strcmp( var_name, var->name ) ) {
			return var;
		}
	}

	return NULL;
}

/*
============
Cvar_Exists
============
*/
qboolean Cvar_Exists( const char *name ) {
	if( Cvar_FindVar( name ) ) {
		return qtrue;
	}
	return qfalse;
}

/*
============
Cvar_VariableValue
============
*/
float Cvar_VariableValue( const char *var_name ) {
	cvar_t	*var;

	var = Cvar_FindVar( var_name );
	if( !var )
		return 0;

	return var->value;
}

/*
============
Cvar_VariableInteger
============
*/
int Cvar_VariableInteger( const char *var_name ) {
	cvar_t	*var;

	var = Cvar_FindVar( var_name );
	if( !var )
		return 0;

	return var->integer;
}


/*
============
Cvar_VariableString
============
*/
char *Cvar_VariableString( const char *var_name ) {
	cvar_t *var;

	var = Cvar_FindVar( var_name );
	if( !var )
		return "";

	return var->string;
}

/*
============
Cvar_VariableStringBuffer
============
*/
void Cvar_VariableStringBuffer( const char *var_name, char *buffer,
        int bufferSize )
{
	Q_strncpyz( buffer, Cvar_VariableString( var_name ), bufferSize );
}


const char *Cvar_Generator( const char *text, int state ) {
    static int length;
    static cvar_t *cvar;
    const char *name;

    if( !state ) {
        length = strlen( text );
        cvar = cvar_vars;
    }

    while( cvar ) {
        name = cvar->name;
        cvar = cvar->next;
		if( !strncmp( text, name, length ) ) {
            return name;
        }
    }

    return NULL;
}

static void Cvar_ParseString( cvar_t *var ) {
	char *s = var->string;

	if( s[0] == '0' && s[1] == 'x' ) {
		var->integer = COM_ParseHex( s + 2 );
		var->value = ( float )var->integer;
	} else {
		var->integer = atoi( var->string );
		var->value = atof( var->string );
	}
}

/*
============
Cvar_Get

If the variable already exists, the value will not be set
The flags will be or'ed in if the variable exists.
============
*/
cvar_t *Cvar_Get( const char *var_name, const char *var_value, int flags ) {
	cvar_t	*var;
	uint32 hash;
	int length;

	if( !var_name ) {
		Com_Error( ERR_FATAL, "Cvar_Get: NULL variable name" );
	}
	if( !var_value ) {
		var_value = "";
	}

	if( flags & CVAR_INFOMASK ) {
		length = strlen( var_name );
		if( length >= MAX_INFO_KEY ) {
			Com_WPrintf( "Oversize info cvar name: %d chars.\n", length );
			goto badvar;
		}
		if( !Info_ValidateSubstring( var_name ) ) {
			Com_WPrintf( "Invalid info cvar name.\n" );
			goto badvar;
		}
		length = strlen( var_value );
		if( length >= MAX_INFO_VALUE ) {
			Com_WPrintf( "Oversize info cvar value: %d chars.\n", length );
			goto badvar;
		}
		if( !Info_ValidateSubstring( var_value ) ) {
			Com_WPrintf( "Invalid info cvar value.\n" );
			goto badvar;
		}
	}

	var = Cvar_FindVar( var_name );
	if( var ) {
		if( ( var->flags & CVAR_LATCHED ) && var->latched_string ) {
			if( strcmp( var->latched_string, var->string ) ) {
				// update latched cvar
				Z_Free( var->string );
				var->string = Cvar_CopyString( var->latched_string );
				Cvar_ParseString( var );

				if( var->flags & CVAR_USERINFO ) {
					CL_UpdateUserinfo( var, CVAR_SET_DIRECT );
				}

				var->modified = qtrue;
			}

			Z_Free( var->latched_string );
			var->latched_string = NULL;
		}

		if( !( flags & CVAR_USER_CREATED ) ) {
			if( var->flags & CVAR_USER_CREATED ) {
				/* update default string if cvar was set from command line */
				Z_Free( var->defaultString );
				var->defaultString = Cvar_CopyString( var_value );
				var->flags &= ~CVAR_USER_CREATED;
				var->subsystem = currentSubsystem;
			} else if( !( var->flags & CVAR_DEFAULTS_MIXED ) ) {
				if( strcmp( var->defaultString, var_value ) ) {
					Com_DPrintf( "Cvar \"%s\" given initial values: "
								"\"%s\" and \"%s\"\n",
									var->name, var->defaultString, var_value );
					var->flags |= CVAR_DEFAULTS_MIXED;
				}
			}
            if( ( var->flags & CVAR_LATCHED ) && !( flags & CVAR_LATCHED ) ) {
                if( var->latched_string ) {
                    Z_Free( var->latched_string );
                    var->latched_string = NULL;
                }
                var->flags &= ~CVAR_LATCHED;
            }
		} else {
			flags &= ~CVAR_USER_CREATED;
		}

		var->flags |= flags;
		return var;
	}

	/* once allocated, cvar name is never changed */
	length = strlen( var_name ) + 1;
	var = Cvar_Malloc( sizeof( *var ) + length );
	var->name = ( char * )( var + 1 );
	strcpy( var->name, var_name );
	var->string = Cvar_CopyString( var_value );
    var->latched_string = NULL;
	var->defaultString = Cvar_CopyString( var_value );
	Cvar_ParseString( var );
	var->flags = flags;
	var->subsystem = currentSubsystem;
    var->changedFunc = NULL;
    var->changedArg = NULL;
    var->description = NULL;

	hash = Com_HashString( var_name, CVARHASH_SIZE );

	// link the variable in
	var->next = cvar_vars;
	cvar_vars = var;
	var->hashNext = cvarHash[hash];
	cvarHash[hash] = var;

	var->modified = qtrue;

	return var;

badvar:
	if( !( flags & CVAR_USER_CREATED ) ) {
		Com_Error( ERR_FATAL, "Cvar_Get: invalid info variable" );
	}
	return NULL;
}

void Cvar_Subsystem( cvarSubsystem_t subsystem ) {
	currentSubsystem = subsystem;
}

/*
============
Cvar_SetByVar
============
*/
void Cvar_SetByVar( cvar_t *var, const char *value, cvarSetSource_t source ) {
	int length;

	if( !strcmp( value, var->string ) &&
            !( var->flags & (CVAR_LATCHED|CVAR_LATCH) ) )
    {
		return;		// not changed
    }

	Com_DPrintf( "Cvar_Set( \"%s\", \"%s\" )\n", var->name, value );

	if( var->flags & CVAR_INFOMASK ) {
		length = strlen( value );
		if( length >= MAX_INFO_VALUE ) {
			Com_WPrintf(
                    "Oversize info cvar value specified (%d chars), ignored.\n",
                    length );
			return;
		}
		if( !Info_ValidateSubstring( value ) ) {
			Com_WPrintf( "Invalid info cvar value specified, ignored.\n" );
			return;
		}
	}

	/* some cvars may not be changed by user at all */
	if( source != CVAR_SET_DIRECT ) {
		if( var->flags & CVAR_ROM ) {
			Com_Printf( "%s is read-only.\n", var->name );
			return;
		}

		if( var->flags & CVAR_CHEAT ) {
			if( !CL_CheatsOK() ) {
				Com_Printf( "%s is cheat protected.\n", var->name );
				return;
			}
		}
	}

	/* some cvars may require special processing if set by user from console */
	if( source == CVAR_SET_CONSOLE ) {
		if( var->flags & CVAR_NOSET ) {
			Com_Printf( "%s may be set from command line only.\n", var->name );
			return;
		}

		if( var->flags & (CVAR_LATCHED|CVAR_LATCH) ) {
			if( !strcmp( var->string, value ) ) {
				/* set back to current value? */
				if( var->latched_string ) {
					Z_Free( var->latched_string );
					var->latched_string = NULL;
				}
				return;
			}
			if( var->latched_string ) {
				if( !strcmp( var->latched_string, value ) ) {
					/* latched string not changed? */
					return;
				}
				Z_Free( var->latched_string );
				var->latched_string = NULL;
			}


			if( var->flags & CVAR_LATCH ) {
				if( sv_running->integer ) {
					if( !cvar_silent->integer ) {
						Com_Printf( "%s will be changed for next game.\n",
                            var->name );
					}
					var->latched_string = Cvar_CopyString( value );
					return;
				}
				/* server is down, it's ok to update this cvar now */
			} else {
				char *subsystem;

				var->latched_string = Cvar_CopyString( value );
				cvar_latchedModified |= 1 << var->subsystem;
				if( cvar_silent->integer ) {
					return;
				}

				switch( var->subsystem ) {
				case CVAR_SYSTEM_GENERIC:
					subsystem = "desired subsystem";
					break;
				case CVAR_SYSTEM_VIDEO:
					subsystem = "video subsystem";
					break;
				case CVAR_SYSTEM_SOUND:
					subsystem = "sound subsystem";
					break;
				case CVAR_SYSTEM_INPUT:
					subsystem = "input subsystem";
					break;
				case CVAR_SYSTEM_NET:
					subsystem = "network subsystem";
					break;
				case CVAR_SYSTEM_FILES:
					subsystem = "filesystem";
					break;
				default:
					Com_Error( ERR_FATAL, "Cvar_SetByVar: invalid subsystem %u",
                            var->subsystem );
					subsystem = NULL;
					break;
				}
				Com_Printf( "%s will be changed upon restarting the %s.\n",
					var->name, subsystem );
				return;
			}
		}

	}

	/* free latched string, if any */
	if( var->latched_string ) {
		Z_Free( var->latched_string );
		var->latched_string = NULL;
	}

	Z_Free( var->string );	// free the old value string

	var->string = Cvar_CopyString( value );
	Cvar_ParseString( var );

	if( var->flags & CVAR_INFOMASK ) {
		cvar_infoModified |= var->flags & CVAR_INFOMASK;
		if( var->flags & CVAR_USERINFO ) {
			CL_UpdateUserinfo( var, source );
		}
	}

	var->modified = qtrue;
	if( source != CVAR_SET_DIRECT && var->changedFunc ) {
		var->changedFunc( var, var->changedArg );
	}
}

/*
============
Cvar_SetEx
============
*/
cvar_t *Cvar_SetEx( const char *var_name, const char *value,
        cvarSetSource_t source )
{
	cvar_t	*var;

	var = Cvar_FindVar( var_name );
	if( !var ) {
		// create it
		return Cvar_Get( var_name, value, CVAR_USER_CREATED );
	}

	Cvar_SetByVar( var, value, source );

	return var;
}

/*
============
Cvar_FullSet
============
*/
cvar_t *Cvar_FullSet( const char *var_name, const char *value, int flags, cvarSetSource_t source ) {
	cvar_t *var;

	var = Cvar_FindVar( var_name );
	if( !var ) {
		// create it
		return Cvar_Get( var_name, value, flags | CVAR_USER_CREATED );
	}

	Cvar_SetByVar( var, value, source );

	// force retransmit of userinfo variables
	// needed for compatibility with q2admin
	if( ( var->flags | flags ) & CVAR_USERINFO ) {
		cvar_infoModified |= CVAR_USERINFO;
		CL_UpdateUserinfo( var, source );
	}

	var->flags &= ~CVAR_INFOMASK;
	var->flags |= flags;

	return var;
}

/*
============
Cvar_Set
============
*/
cvar_t *Cvar_Set( const char *var_name, const char *value ) {
	return Cvar_SetEx( var_name, value, CVAR_SET_DIRECT );
}

/*
============
Cvar_UserSet
============
*/
cvar_t *Cvar_UserSet( const char *var_name, const char *value ) {
	return Cvar_SetEx( var_name, value, CVAR_SET_CONSOLE );
}


/*
============
Cvar_SetValue
============
*/
void Cvar_SetValue( const char *var_name, float value ) {
	char	val[32];

	if( value == (int)value )
		Com_sprintf( val, sizeof( val ), "%i", (int)value );
	else
		Com_sprintf( val, sizeof( val ), "%f", value);

	Cvar_SetEx( var_name, val, CVAR_SET_DIRECT );
}

/*
============
Cvar_SetInteger
============
*/
void Cvar_SetInteger( const char *var_name, int value ) {
	char	val[32];

	Com_sprintf( val, sizeof( val ), "%i", value );

	Cvar_SetEx( var_name, val, CVAR_SET_DIRECT );
}

/*
============
Cvar_SetInteger
============
*/
void Cvar_SetIntegerHex( const char *var_name, uint32 value ) {
	char	val[32];

	Com_sprintf( val, sizeof( val ), "0x%X", value );

	Cvar_SetEx( var_name, val, CVAR_SET_DIRECT );
}

/*
============
Cvar_ClampInteger
============
*/
void Cvar_ClampInteger( cvar_t *var, int min, int max ) {
	char	val[32];

	if( var->integer < min ) {
		Com_sprintf( val, sizeof( val ), "%i", min );
		Cvar_SetByVar( var, val, CVAR_SET_DIRECT );
	} else if( var->integer > max ) {
		Com_sprintf( val, sizeof( val ), "%i", max );
		Cvar_SetByVar( var, val, CVAR_SET_DIRECT );
	}
}

/*
============
Cvar_ClampValue
============
*/
void Cvar_ClampValue( cvar_t *var, float min, float max ) {
	char	val[32];

	if( var->value < min ) {
		if( min == (int)min ) {
			Com_sprintf( val, sizeof( val ), "%i", (int)min );
		} else {
			Com_sprintf( val, sizeof( val ), "%f", min );
		}
		Cvar_SetByVar( var, val, CVAR_SET_DIRECT );
	} else if( var->value > max ) {
		if( max == (int)max ) {
			Com_sprintf( val, sizeof( val ), "%i", (int)max );
		} else {
			Com_sprintf( val, sizeof( val ), "%f", max );
		}
		Cvar_SetByVar( var, val, CVAR_SET_DIRECT );
	}
}

/*
==================
Cvar_FixCheats
==================
*/
void Cvar_FixCheats( void ) {
   cvar_t *var;

    if ( CL_CheatsOK() ) {
        return;
    }

    // fix any cheating cvars
    for( var = cvar_vars ; var ; var = var->next ) {
		if( var->flags & CVAR_CHEAT ) {
			Cvar_SetByVar( var, var->defaultString, CVAR_SET_DIRECT );
		}
    }
}

/*
============
Cvar_GetLatchedVars

Any variables with latched values will now be updated
Only used for game latched cvars now
============
*/
void Cvar_GetLatchedVars( void ) {
	cvar_t	*var;

	for( var = cvar_vars; var; var = var->next ) {
		if( !(var->flags & CVAR_LATCH) )
			continue;
		if( var->flags & CVAR_LATCHED )
			continue; // don't update engine cvars
		if( !var->latched_string )
			continue;
		Z_Free( var->string );
		var->string = var->latched_string;
		var->latched_string = NULL;
		Cvar_ParseString( var );

		var->modified = qtrue;
	}
}

/*
============
Cvar_Command

Handles variable inspection and changing from the console
============
*/
qboolean Cvar_Command( void ) {
	cvar_t			*v;

// check variables
	v = Cvar_FindVar( Cmd_Argv( 0 ) );
	if( !v )
		return qfalse;

// perform a variable print or set
	if( Cmd_Argc() == 1 ) {
		if( v->flags & CVAR_ROM ) {
			Com_Printf( "\"%s\" is \"%s\"\n", v->name, v->string );
		} else {
			Com_Printf( "\"%s\" is \"%s\"  ", v->name, v->string );
            if( strcmp( v->string, v->defaultString ) ) {
			    Com_Printf( "default: \"%s\"  ", v->defaultString );
            }
			if( v->latched_string && strcmp( v->latched_string, v->string ) ) {
				Com_Printf( "latched: \"%s\"", v->latched_string );
			}
			Com_Printf( "\n" );
		}
		return qtrue;
	}

	Cvar_SetByVar( v, Cmd_Argv( 1 ), CVAR_SET_CONSOLE );

	return qtrue;
}


/*
============
Cvar_Set_f

Allows setting and defining of arbitrary cvars from console
============
*/
void Cvar_Set_f( void ) {
	int		c, flags;
	char	*f;
	cvar_t	*var;

	c = Cmd_Argc();
	if( c != 3 && c != 4 ) {
		Com_Printf( "Usage: set <variable> <value> [u / s]\n" );
		return;
	}

	if( c != 4 ) {
		Cvar_SetEx( Cmd_Argv( 1 ), Cmd_Argv( 2 ), CVAR_SET_CONSOLE );
		return;
	}

	f = Cmd_Argv( 3 );
	if( !strcmp( f, "u" ) ) {
		flags = CVAR_USERINFO;
	} else if( !strcmp( f, "s" ) ) {
		flags = CVAR_SERVERINFO;
	} else {
		Com_Printf( "Flags can only be 'u' or 's'\n" );
		return;
	}

	var = Cvar_FullSet( Cmd_Argv( 1 ), Cmd_Argv( 2 ), flags, CVAR_SET_CONSOLE );
	if( !var ) {
		return;
	}
}

/*
============
Cvar_SetFlag_f

Allows setting and defining of arbitrary cvars from console
============
*/
static void Cvar_SetFlag_f( void ) {
	char	*s;
	int		flags;

	if( Cmd_Argc() < 3 ) {
		Com_Printf( "Usage: %s <variable> <value>\n", Cmd_Argv( 0 ) );
		return;
	}

	s = Cmd_Argv( 0 );
	if( !Q_stricmp( s, "setu" ) ) {
		flags = CVAR_USERINFO;
	} else if( !Q_stricmp( s, "sets" ) ) {
		flags = CVAR_SERVERINFO;
	} else if( !Q_stricmp( s, "seta" ) ) {
		flags = CVAR_ARCHIVE;
	} else {
		return;
	}

	Cvar_FullSet( Cmd_Argv( 1 ), Cmd_ArgsFrom( 2 ), flags, CVAR_SET_CONSOLE );
}

#ifndef DEDICATED_ONLY

/*
============
Cvar_WriteVariables

Appends lines containing "set variable value" for all variables
with the archive flag set to true.
============
*/
void Cvar_WriteVariables( fileHandle_t f ) {
	cvar_t	*var;
    char *string;

	for( var = cvar_vars; var; var = var->next ) {
		if( var->flags & CVAR_ARCHIVE ) {
            if( ( var->flags & CVAR_LATCHED ) && var->latched_string ) {
                string = var->latched_string;
            } else {
                string = var->string;
            }
			FS_FPrintf( f, "set %s \"%s\"\n", var->name, string );
		}
	}
}

#endif

/*
============
Cvar_List_f

============
*/
static void Cvar_List_f( void ) {
	cvar_t	*var;
	int		i, total;
	char *wildcard;
	int showDesc;
	int showFlags;
	char buffer[6];

	if( Cmd_CheckParam( "h", "help" ) ) {
		Com_Printf( "Usage: %s [-f] [-d] [-h] [-w <wildcard>]\n",
                Cmd_Argv( 0 ) );
		Com_Printf( "Options:\n"
					"-d, --desc     : display description of each cvar\n"
					"-f, --flags    : display flags of each cvar\n"
					"-h, --help     : display this help message\n"
					"-w, --wildcard : filter cvars by wildcard\n"
					"Flags legend:\n"
					"C: cheat protected\n"
					"A: archived in config file\n"
					"U: included in userinfo\n"
					"S: included in serverinfo\n"
					"N: set from command line only\n"
					"R: read-only variable\n"
					"L: latched (requires subsystem restart)\n"
					"G: latched (requires game map restart)\n"
					"?: created by user\n" );
		return;
	}

	showFlags = Cmd_CheckParam( "f", "flags" );
	showDesc = Cmd_CheckParam( "d", "desc" );
	wildcard = Cmd_FindParam( "w", "wildcard" );

	buffer[sizeof( buffer ) - 1] = 0;
	i = 0;
	for( var = cvar_vars, total = 0; var; var = var->next, total++ ) {
		if( wildcard && !Com_WildCmp( wildcard, var->name, qtrue ) ) {
			continue;
		}

		if( showFlags ) {
			memset( buffer, ' ', sizeof( buffer ) - 1 );

			if( var->flags & CVAR_CHEAT )
				buffer[0] = 'C';

			if( var->flags & CVAR_ARCHIVE )
				buffer[1] = 'A';

			if( var->flags & CVAR_USERINFO )
				buffer[2] = 'U';

			if( var->flags & CVAR_SERVERINFO )
				buffer[3] = 'S';

			if( var->flags & CVAR_ROM )
				buffer[4] = 'R';
            else if( var->flags & CVAR_NOSET )
				buffer[4] = 'N';
			else if( var->flags & CVAR_LATCHED )
				buffer[4] = 'L';
			else if( var->flags & CVAR_LATCH )
				buffer[4] = 'G';
			else if( var->flags & CVAR_USER_CREATED )
				buffer[4] = '?';

			Com_Printf( "%s ", buffer );
		}

		if( showDesc && var->description ) {
			Com_Printf( "%s \"%s\" %s\n", var->name, var->string,
                    var->description );
		} else {
			Com_Printf( "%s \"%s\"\n", var->name, var->string );
		}

		i++;
	}
	Com_Printf( "%i of %i cvars\n", i, total );
}

/*
============
Cvar_Toggle_f
============
*/
static void Cvar_Toggle_f( void ) {
	char buffer[MAX_STRING_CHARS];
	cvar_t *var;
	int i;
	int numArgs;

	if( Cmd_Argc() < 2 ) {
		Com_Printf( "Usage: %s <variable> [values]\n", Cmd_Argv( 0 ) );
		return;
	}

	var = Cvar_FindVar( Cmd_Argv( 1 ) );
	if( !var ) {
		Com_Printf( "%s is not a variable\n", Cmd_Argv( 1 ) );
		return;
	}

	if( Cmd_Argc() < 3 ) {
		if( !strcmp( var->string, "0" ) ) {
			Cvar_SetByVar( var, "1", CVAR_SET_CONSOLE );
		} else if( !strcmp( var->string, "1" ) ) {
			Cvar_SetByVar( var, "0", CVAR_SET_CONSOLE );
		} else {
			Com_Printf( "\"%s\" is \"%s\", can't toggle\n",
                    var->name, var->string );
		}
		return;
	}

	Q_strncpyz( buffer, Cmd_RawArgsFrom( 2 ), sizeof( buffer ) );
	Cmd_TokenizeString( buffer, qfalse );
	numArgs = Cmd_Argc();
	for( i = 0; i < numArgs; i++ ) {
		if( !Q_stricmp( var->string, Cmd_Argv( i ) ) ) {
			i = ( i + 1 ) % numArgs;
			Cvar_SetByVar( var, Cmd_Argv( i ), CVAR_SET_CONSOLE );
			return;
		}
	}

	Com_Printf( "\"%s\" is \"%s\", can't cycle\n", var->name, var->string );
}

/*
============
Cvar_Inc_f
============
*/
static void Cvar_Inc_f( void ) {
	cvar_t *var;
	float val;

	if( Cmd_Argc() < 2 ) {
		Com_Printf( "Usage: %s <variable> [value]\n", Cmd_Argv( 0 ) );
		return;
	}

	var = Cvar_FindVar( Cmd_Argv( 1 ) );
	if( !var ) {
		Com_Printf( "%s is not a variable\n", Cmd_Argv( 1 ) );
		return;
	}

	if( !COM_IsNumeric( var->string ) ) {
		Com_Printf( "\"%s\" is \"%s\", can't increment\n",
                var->name, var->string );
		return;
	}

	val = 1.0f;
	if( Cmd_Argc() > 2 ) {
		val = atof( Cmd_Argv( 2 ) );
	}

	Cvar_SetValue( var->name, var->value + val );
}

/*
============
Cvar_Reset_f
============
*/
static void Cvar_Reset_f( void ) {
	cvar_t *var;

	if( Cmd_Argc() < 2 ) {
		Com_Printf( "Usage: %s <variable>\n", Cmd_Argv( 0 ) );
		return;
	}

	var = Cvar_FindVar( Cmd_Argv( 1 ) );
	if( !var ) {
		Com_Printf( "%s is not a variable\n", Cmd_Argv( 1 ) );
		return;
	}

	Cvar_SetByVar( var, var->defaultString, CVAR_SET_CONSOLE );
}

char *Cvar_BitInfo( int bit ) {
	static char	info[MAX_INFO_STRING];
	char newi[MAX_INFO_STRING];
	cvar_t	*var;
	int length, totalLength;

	info[0] = 0;
	totalLength = 0;

	for( var = cvar_vars; var; var = var->next ) {
		if( !( var->flags & bit ) ) {
            continue;
        }
        if( !var->string[0] ) {
            continue;
        }
        length = Com_sprintf( newi, sizeof( newi ), "\\%s\\%s",
                var->name, var->string );
        if( totalLength + length > MAX_INFO_STRING - 1 ) {
            break;
        }
        strcpy( info + totalLength, newi );
        totalLength += length;
	}
	return info;
}

// used for generating enhanced server status response
char *Cvar_BitInfo_Big( int bit ) {
	static char	info[MAX_STRING_CHARS];
	char newi[MAX_STRING_CHARS];
	cvar_t	*var;
	int length, totalLength;

	info[0] = 0;
	totalLength = 0;

	for( var = cvar_vars; var; var = var->next ) {
		if( !( var->flags & bit ) ) {
            continue;
        }
        if( !var->string[0] ) {
            continue;
        }
        length = Com_sprintf( newi, sizeof( newi ), "\\%s\\%s",
                var->name, var->string );
        if( totalLength + length > MAX_STRING_CHARS - 1 ) {
            break;
        }
        strcpy( info + totalLength, newi );
        totalLength += length;
	}
	return info;
}

/*
============
Cvar_FillAPI
============
*/
void Cvar_FillAPI( cvarAPI_t *api ) {
	api->Get = Cvar_Get;
	api->Set = Cvar_Set;
	api->SetValue = Cvar_SetValue;
	api->SetInteger = Cvar_SetInteger;
	api->VariableValue = Cvar_VariableValue;
	api->VariableInteger = Cvar_VariableInteger;
	api->VariableString = Cvar_VariableString;
	api->VariableStringBuffer = Cvar_VariableStringBuffer;
	api->Subsystem = Cvar_Subsystem;
}

/*
============
Cvar_Init
============
*/
void Cvar_Init( void ) {
	cvar_silent = Cvar_Get( "cvar_silent", "0", 0 );

	Cmd_AddCommandEx( "set", Cvar_Set_f, Cvar_Generator );
	Cmd_AddCommandEx( "setu", Cvar_SetFlag_f, Cvar_Generator );
	Cmd_AddCommandEx( "sets", Cvar_SetFlag_f, Cvar_Generator );
	Cmd_AddCommandEx( "seta", Cvar_SetFlag_f, Cvar_Generator );
	Cmd_AddCommand( "cvarlist", Cvar_List_f );
	Cmd_AddCommandEx( "cvar_toggle", Cvar_Toggle_f, Cvar_Generator );
	Cmd_AddCommandEx( "cvar_inc", Cvar_Inc_f, Cvar_Generator );
	Cmd_AddCommandEx( "cvar_reset", Cvar_Reset_f, Cvar_Generator );

	Cvar_FillAPI( &cvar );
}