The Quake sources as originally release under the GPL license on December 21, 1999

WinQuake/cvar.c

@@ -0,0 +1,224 @@
+/*
+Copyright (C) 1996-1997 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 "quakedef.h"
+
+cvar_t	*cvar_vars;
+char	*cvar_null_string = "";
+
+/*
+============
+Cvar_FindVar
+============
+*/
+cvar_t *Cvar_FindVar (char *var_name)
+{
+	cvar_t	*var;
+	
+	for (var=cvar_vars ; var ; var=var->next)
+		if (!Q_strcmp (var_name, var->name))
+			return var;
+
+	return NULL;
+}
+
+/*
+============
+Cvar_VariableValue
+============
+*/
+float	Cvar_VariableValue (char *var_name)
+{
+	cvar_t	*var;
+	
+	var = Cvar_FindVar (var_name);
+	if (!var)
+		return 0;
+	return Q_atof (var->string);
+}
+
+
+/*
+============
+Cvar_VariableString
+============
+*/
+char *Cvar_VariableString (char *var_name)
+{
+	cvar_t *var;
+	
+	var = Cvar_FindVar (var_name);
+	if (!var)
+		return cvar_null_string;
+	return var->string;
+}
+
+
+/*
+============
+Cvar_CompleteVariable
+============
+*/
+char *Cvar_CompleteVariable (char *partial)
+{
+	cvar_t		*cvar;
+	int			len;
+	
+	len = Q_strlen(partial);
+	
+	if (!len)
+		return NULL;
+		
+// check functions
+	for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
+		if (!Q_strncmp (partial,cvar->name, len))
+			return cvar->name;
+
+	return NULL;
+}
+
+
+/*
+============
+Cvar_Set
+============
+*/
+void Cvar_Set (char *var_name, char *value)
+{
+	cvar_t	*var;
+	qboolean changed;
+	
+	var = Cvar_FindVar (var_name);
+	if (!var)
+	{	// there is an error in C code if this happens
+		Con_Printf ("Cvar_Set: variable %s not found\n", var_name);
+		return;
+	}
+
+	changed = Q_strcmp(var->string, value);
+	
+	Z_Free (var->string);	// free the old value string
+	
+	var->string = Z_Malloc (Q_strlen(value)+1);
+	Q_strcpy (var->string, value);
+	var->value = Q_atof (var->string);
+	if (var->server && changed)
+	{
+		if (sv.active)
+			SV_BroadcastPrintf ("\"%s\" changed to \"%s\"\n", var->name, var->string);
+	}
+}
+
+/*
+============
+Cvar_SetValue
+============
+*/
+void Cvar_SetValue (char *var_name, float value)
+{
+	char	val[32];
+	
+	sprintf (val, "%f",value);
+	Cvar_Set (var_name, val);
+}
+
+
+/*
+============
+Cvar_RegisterVariable
+
+Adds a freestanding variable to the variable list.
+============
+*/
+void Cvar_RegisterVariable (cvar_t *variable)
+{
+	char	*oldstr;
+	
+// first check to see if it has allready been defined
+	if (Cvar_FindVar (variable->name))
+	{
+		Con_Printf ("Can't register variable %s, allready defined\n", variable->name);
+		return;
+	}
+	
+// check for overlap with a command
+	if (Cmd_Exists (variable->name))
+	{
+		Con_Printf ("Cvar_RegisterVariable: %s is a command\n", variable->name);
+		return;
+	}
+		
+// copy the value off, because future sets will Z_Free it
+	oldstr = variable->string;
+	variable->string = Z_Malloc (Q_strlen(variable->string)+1);	
+	Q_strcpy (variable->string, oldstr);
+	variable->value = Q_atof (variable->string);
+	
+// link the variable in
+	variable->next = cvar_vars;
+	cvar_vars = variable;
+}
+
+/*
+============
+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 false;
+		
+// perform a variable print or set
+	if (Cmd_Argc() == 1)
+	{
+		Con_Printf ("\"%s\" is \"%s\"\n", v->name, v->string);
+		return true;
+	}
+
+	Cvar_Set (v->name, Cmd_Argv(1));
+	return true;
+}
+
+
+/*
+============
+Cvar_WriteVariables
+
+Writes lines containing "set variable value" for all variables
+with the archive flag set to true.
+============
+*/
+void Cvar_WriteVariables (FILE *f)
+{
+	cvar_t	*var;
+	
+	for (var = cvar_vars ; var ; var = var->next)
+		if (var->archive)
+			fprintf (f, "%s \"%s\"\n", var->name, var->string);
+}
+