1/*
2Copyright (C) 1996-1997 Id Software, Inc.
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18
19*/
20// cvar.c -- dynamic variable tracking
21
22#include "quakedef.h"
23
24cvar_t	*cvar_vars;
25const char	*cvar_null_string = "";
26
27/*
28============
29Cvar_FindVar
30============
31*/
32cvar_t *Cvar_FindVar (const char *var_name)
33{
34	cvar_t	*var;
35
36	for (var=cvar_vars ; var ; var=var->next)
37		if (!Q_strcmp (var_name, var->name))
38			return var;
39
40	return NULL;
41}
42
43/*
44============
45Cvar_VariableValue
46============
47*/
48float	Cvar_VariableValue (const char *var_name)
49{
50	cvar_t	*var;
51
52	var = Cvar_FindVar (var_name);
53	if (!var)
54		return 0;
55	return Q_atof (var->string);
56}
57
58
59/*
60============
61Cvar_VariableString
62============
63*/
64const char *Cvar_VariableString (const char *var_name)
65{
66	cvar_t *var;
67
68	var = Cvar_FindVar (var_name);
69	if (!var)
70		return cvar_null_string;
71	return var->string;
72}
73
74
75/*
76============
77Cvar_CompleteVariable
78============
79*/
80const char *Cvar_CompleteVariable (const char *partial)
81{
82	cvar_t		*cvar;
83	int			len;
84
85	len = Q_strlen(partial);
86
87	if (!len)
88		return NULL;
89
90// check functions
91	for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
92		if (!Q_strncmp (partial,cvar->name, len))
93			return cvar->name;
94
95	return NULL;
96}
97
98
99/*
100============
101Cvar_Set
102============
103*/
104void Cvar_Set (const char *var_name, const char *value)
105{
106	cvar_t	*var;
107	qboolean changed;
108
109	var = Cvar_FindVar (var_name);
110	if (!var)
111	{	// there is an error in C code if this happens
112		Con_Printf ("Cvar_Set: variable %s not found\n", var_name);
113		return;
114	}
115
116	changed = Q_strcmp(var->string, value);
117
118	Z_Free (var->string);	// free the old value string
119
120	var->string = (char*) Z_Malloc (Q_strlen(value)+1);
121	Q_strcpy (var->string, value);
122	var->value = Q_atof (var->string);
123	if (var->server && changed)
124	{
125		if (sv.active)
126			SV_BroadcastPrintf ("\"%s\" changed to \"%s\"\n", var->name, var->string);
127	}
128}
129
130/*
131============
132Cvar_SetValue
133============
134*/
135void Cvar_SetValue (const char *var_name, float value)
136{
137	char	val[32];
138
139	sprintf (val, "%f",value);
140	Cvar_Set (var_name, val);
141}
142
143
144/*
145============
146Cvar_RegisterVariable
147
148Adds a freestanding variable to the variable list.
149============
150*/
151void Cvar_RegisterVariable (cvar_t *variable)
152{
153	char	*oldstr;
154
155// first check to see if it has allready been defined
156	if (Cvar_FindVar (variable->name))
157	{
158		Con_Printf ("Can't register variable %s, allready defined\n", variable->name);
159		return;
160	}
161
162// check for overlap with a command
163	if (Cmd_Exists (variable->name))
164	{
165		Con_Printf ("Cvar_RegisterVariable: %s is a command\n", variable->name);
166		return;
167	}
168
169// copy the value off, because future sets will Z_Free it
170	oldstr = variable->string;
171	variable->string = (char*) Z_Malloc (Q_strlen(variable->string)+1);
172	Q_strcpy (variable->string, oldstr);
173	variable->value = Q_atof (variable->string);
174
175// link the variable in
176	variable->next = cvar_vars;
177	cvar_vars = variable;
178}
179
180/*
181============
182Cvar_Command
183
184Handles variable inspection and changing from the console
185============
186*/
187qboolean	Cvar_Command (void)
188{
189	cvar_t			*v;
190
191// check variables
192	v = Cvar_FindVar (Cmd_Argv(0));
193	if (!v)
194		return false;
195
196// perform a variable print or set
197	if (Cmd_Argc() == 1)
198	{
199		Con_Printf ("\"%s\" is \"%s\"\n", v->name, v->string);
200		return true;
201	}
202
203	Cvar_Set (v->name, Cmd_Argv(1));
204	return true;
205}
206
207
208/*
209============
210Cvar_WriteVariables
211
212Writes lines containing "set variable value" for all variables
213with the archive flag set to true.
214============
215*/
216void Cvar_WriteVariables (FILE *f)
217{
218	cvar_t	*var;
219
220	for (var = cvar_vars ; var ; var = var->next)
221		if (var->archive)
222			fprintf (f, "%s \"%s\"\n", var->name, var->string);
223}
224
225