Games/Quake/cvar.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, 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
  24 cvar_t  *cvar_vars;
  25 char    *cvar_null_string = "";
  26
  27 /*
  28 ============
  29 Cvar_FindVar
  30 ============
  31 */
  32 cvar_t *Cvar_FindVar (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 ============
  45 Cvar_VariableValue
  46 ============
  47 */
  48 float   Cvar_VariableValue (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 ============
  61 Cvar_VariableString
  62 ============
  63 */
  64 char *Cvar_VariableString (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 ============
  77 Cvar_CompleteVariable
  78 ============
  79 */
  80 char *Cvar_CompleteVariable (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 ============
 101 Cvar_Set
 102 ============
 103 */
 104 void Cvar_Set (char *var_name, 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 = 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 ============
 132 Cvar_SetValue
 133 ============
 134 */
 135 void Cvar_SetValue (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 ============
 146 Cvar_RegisterVariable
 147
 148 Adds a freestanding variable to the variable list.
 149 ============
 150 */
 151 void 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 = 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 ============
 182 Cvar_Command
 183
 184 Handles variable inspection and changing from the console
 185 ============
 186 */
 187 qboolean        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 ============
 210 Cvar_WriteVariables
 211
 212 Writes lines containing "set variable value" for all variables
 213 with the archive flag set to true.
 214 ============
 215 */
 216 void 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