quakeforge/libs/util/cvar.c

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/*
cvar.c
dynamic variable tracking
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
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static const char rcsid[] =
"$Id$";
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "QF/cmd.h"
#include "QF/cvar.h"
#include "QF/hash.h"
#include "QF/qargs.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "QF/vfs.h"
#include "compat.h"
#define USER_RO_CVAR "User-created READ-ONLY Cvar"
#define USER_CVAR "User-created cvar"
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cvar_t *developer;
cvar_t *cvar_vars;
char *cvar_null_string = "";
cvar_alias_t *calias_vars;
hashtab_t *cvar_hash;
hashtab_t *calias_hash;
cvar_t *
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Cvar_FindVar (const char *var_name)
{
return (cvar_t*) Hash_Find (cvar_hash, var_name);
}
cvar_t *
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Cvar_FindAlias (const char *alias_name)
{
cvar_alias_t *alias;
alias = (cvar_alias_t*) Hash_Find (calias_hash, alias_name);
if (alias)
return alias->cvar;
return 0;
}
void
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Cvar_Alias_Get (const char *name, cvar_t *cvar)
{
cvar_alias_t *alias;
cvar_t *var;
if (Cmd_Exists (name)) {
Sys_Printf ("CAlias_Get: %s is a command\n", name);
return;
}
if (Cvar_FindVar (name)) {
Sys_Printf ("CAlias_Get: tried to alias used cvar name %s\n", name);
return;
}
var = Cvar_FindAlias (name);
if (!var) {
alias = (cvar_alias_t *) calloc (1, sizeof (cvar_alias_t));
alias->next = calias_vars;
calias_vars = alias;
alias->name = strdup (name);
alias->cvar = cvar;
Hash_Add (calias_hash, alias);
}
}
float
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Cvar_VariableValue (const char *var_name)
{
cvar_t *var;
var = Cvar_FindVar (var_name);
if (!var)
var = Cvar_FindAlias (var_name);
if (!var)
return 0;
return atof (var->string);
}
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const char *
Cvar_VariableString (const char *var_name)
{
cvar_t *var;
var = Cvar_FindVar (var_name);
if (!var)
var = Cvar_FindAlias (var_name);
if (!var)
return cvar_null_string;
return var->string;
}
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const char *
Cvar_CompleteVariable (const char *partial)
{
cvar_t *cvar;
cvar_alias_t *alias;
int len;
len = strlen (partial);
if (!len)
return NULL;
// check exact match
for (cvar = cvar_vars; cvar; cvar = cvar->next)
if (!strcasecmp (partial, cvar->name))
return cvar->name;
// check aliases too :)
for (alias = calias_vars; alias; alias = alias->next)
if (!strcasecmp (partial, alias->name))
return alias->name;
// check partial match
for (cvar = cvar_vars; cvar; cvar = cvar->next)
if (!strncasecmp (partial, cvar->name, len))
return cvar->name;
// check aliases too :)
for (alias = calias_vars; alias; alias = alias->next)
if (!strncasecmp (partial, alias->name, len))
return alias->name;
return NULL;
}
/*
CVar_CompleteCountPossible
New function for tab-completion system
Added by EvilTypeGuy
Thanks to Fett erich@heintz.com
*/
int
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Cvar_CompleteCountPossible (const char *partial)
{
cvar_t *cvar;
int len;
int h;
h = 0;
len = strlen(partial);
if (!len)
return 0;
// Loop through the cvars and count all possible matches
for (cvar = cvar_vars; cvar; cvar = cvar->next)
if (!strncasecmp(partial, cvar->name, len))
h++;
return h;
}
/*
CVar_CompleteBuildList
New function for tab-completion system
Added by EvilTypeGuy
Thanks to Fett erich@heintz.com
Thanks to taniwha
*/
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const char **
Cvar_CompleteBuildList (const char *partial)
{
cvar_t *cvar;
int len = 0;
int bpos = 0;
int sizeofbuf = (Cvar_CompleteCountPossible (partial) + 1) *
sizeof (char *);
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const char **buf;
len = strlen(partial);
buf = malloc(sizeofbuf + sizeof (char *));
if (!buf)
Sys_Error ("Cvar_CompleteBuildList: Memory Allocation Failure\n");
// Loop through the alias list and print all matches
for (cvar = cvar_vars; cvar; cvar = cvar->next)
if (!strncasecmp(partial, cvar->name, len))
buf[bpos++] = cvar->name;
buf[bpos] = NULL;
return buf;
}
void
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Cvar_Set (cvar_t *var, const char *value)
{
int changed;
if (!var)
return;
if (var->flags & CVAR_ROM) {
Sys_DPrintf ("Cvar \"%s\" is read-only, cannot modify\n", var->name);
return;
}
changed = !strequal (var->string, value);
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free ((char*)var->string); // free the old value string
var->string = strdup (value);
var->value = atof (var->string);
var->int_val = atoi (var->string);
sscanf (var->string, "%f %f %f", &var->vec[0], &var->vec[1], &var->vec[2]);
if (changed && var->callback)
var->callback (var);
}
/*
Cvar_SetROM
doesn't check for CVAR_ROM flag
*/
void
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Cvar_SetROM (cvar_t *var, const char *value)
{
int changed;
if (!var)
return;
changed = !strequal (var->string, value);
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free ((char*)var->string); // free the old value string
var->string = strdup (value);
var->value = atof (var->string);
var->int_val = atoi (var->string);
sscanf (var->string, "%f %f %f", &var->vec[0], &var->vec[1], &var->vec[2]);
if (changed && var->callback)
var->callback (var);
}
// 1999-09-07 weird cvar zeros fix by Maddes
void
Cvar_SetValue (cvar_t *var, float value)
{
char val[32];
int i;
snprintf (val, sizeof (val), "%f", value);
for (i = strlen (val) - 1; i > 0 && val[i] == '0' && val[i - 1] != '.';
i--) {
val[i] = 0;
}
Cvar_Set (var, val);
}
/*
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)
v = Cvar_FindAlias (Cmd_Argv (0));
if (!v)
return false;
// perform a variable print or set
if (Cmd_Argc () == 1) {
Sys_Printf ("\"%s\" is \"%s\"\n", v->name, v->string);
return true;
}
Cvar_Set (v, 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 (VFile *f)
{
cvar_t *var;
for (var = cvar_vars; var; var = var->next)
if (var->flags & CVAR_ARCHIVE)
Qprintf (f, "%s \"%s\"\n", var->name, var->string);
}
void
Cvar_Set_f (void)
{
cvar_t *var;
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const char *value;
const char *var_name;
if (Cmd_Argc () != 3) {
Sys_Printf ("usage: set <cvar> <value>\n");
return;
}
var_name = Cmd_Argv (1);
value = Cmd_Argv (2);
var = Cvar_FindVar (var_name);
if (!var)
var = Cvar_FindAlias (var_name);
if (var) {
if (var->flags & CVAR_ROM) {
Sys_DPrintf ("Cvar \"%s\" is read-only, cannot modify\n",
var_name);
} else {
Cvar_Set (var, value);
}
} else {
var = Cvar_Get (var_name, value, CVAR_USER_CREATED, NULL,
USER_CVAR);
}
}
void
Cvar_Setrom_f (void)
{
cvar_t *var;
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const char *value;
const char *var_name;
if (Cmd_Argc () != 3) {
Sys_Printf ("usage: setrom <cvar> <value>\n");
return;
}
var_name = Cmd_Argv (1);
value = Cmd_Argv (2);
var = Cvar_FindVar (var_name);
if (!var)
var = Cvar_FindAlias (var_name);
if (var) {
if (var->flags & CVAR_ROM) {
Sys_DPrintf ("Cvar \"%s\" is read-only, cannot modify\n",
var_name);
} else {
Cvar_Set (var, value);
Cvar_SetFlags (var, var->flags | CVAR_ROM);
}
} else {
var = Cvar_Get (var_name, value, CVAR_USER_CREATED | CVAR_ROM, NULL,
USER_RO_CVAR);
}
}
void
Cvar_Toggle_f (void)
{
cvar_t *var;
if (Cmd_Argc () != 2) {
Sys_Printf ("toggle <cvar> : toggle a cvar on/off\n");
return;
}
var = Cvar_FindVar (Cmd_Argv (1));
if (!var)
var = Cvar_FindAlias (Cmd_Argv (1));
if (!var) {
Sys_Printf ("Unknown variable \"%s\"\n", Cmd_Argv (1));
return;
}
Cvar_Set (var, var->int_val ? "0" : "1");
}
void
Cvar_CvarList_f (void)
{
cvar_t *var;
int i;
int showhelp = 0;
const char *flags;
if (Cmd_Argc () > 1) {
showhelp = 1;
if (strequal (Cmd_Argv (1), "cfg"))
showhelp++;
}
for (var = cvar_vars, i = 0; var; var = var->next, i++) {
flags = va ("%c%c%c%c",
var->flags & CVAR_ROM ? 'r' : ' ',
var->flags & CVAR_ARCHIVE ? '*' : ' ',
var->flags & CVAR_USERINFO ? 'u' : ' ',
var->flags & CVAR_SERVERINFO ? 's' : ' ');
if (showhelp == 2)
Sys_Printf ("//%s %s\n%s \"%s\"\n\n", flags, var->description,
var->name, var->string);
else if (showhelp)
Sys_Printf ("%s %-20s : %s\n", flags, var->name, var->description);
else
Sys_Printf ("%s %s\n", flags, var->name);
}
Sys_Printf ("------------\n%d variables\n", i);
}
static void
cvar_free (void *c, void *unused)
{
cvar_t *cvar = (cvar_t*)c;
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free ((char*)cvar->name);
free ((char*)cvar->string);
free (cvar);
}
static const char *
cvar_get_key (void *c, void *unused)
{
cvar_t *cvar = (cvar_t*)c;
return cvar->name;
}
static void
calias_free (void *c, void *unused)
{
cvar_alias_t *calias = (cvar_alias_t*)c;
free (calias->name);
free (calias);
}
static const char *
calias_get_key (void *c, void *unused)
{
cvar_alias_t *calias = (cvar_alias_t*)c;
return calias->name;
}
void
Cvar_Init_Hash (void)
{
cvar_hash = Hash_NewTable (1021, cvar_get_key, cvar_free, 0);
calias_hash = Hash_NewTable (1021, calias_get_key, calias_free, 0);
}
void
Cvar_Init (void)
{
developer = Cvar_Get ("developer", "0", CVAR_NONE, NULL,
"set to enable extra debugging information");
Cmd_AddCommand ("set", Cvar_Set_f, "Set the selected variable, useful on "
"the command line (+set variablename setting)");
Cmd_AddCommand ("setrom", Cvar_Setrom_f, "Set the selected variable and "
"make it read only, useful on the command line.\n"
"(+setrom variablename setting)");
Cmd_AddCommand ("toggle", Cvar_Toggle_f, "Toggle a cvar on or off");
Cmd_AddCommand ("cvarlist", Cvar_CvarList_f, "List all cvars");
}
void
Cvar_Shutdown (void)
{
cvar_t *var, *next;
cvar_alias_t *alias, *nextalias;
// Free cvars
var = cvar_vars;
while (var) {
next = var->next;
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free ((char*)var->string);
free ((char*)var->name);
free (var);
var = next;
}
// Free aliases
alias = calias_vars;
while (alias) {
nextalias = alias->next;
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free ((char*)alias->name);
free (alias);
alias = nextalias;
}
}
cvar_t *
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Cvar_Get (const char *name, const char *string, int cvarflags,
void (*callback)(cvar_t*), const char *description)
{
cvar_t *var;
if (Cmd_Exists (name)) {
Sys_Printf ("Cvar_Get: %s is a command\n", name);
return NULL;
}
var = Cvar_FindVar (name);
if (!var) {
cvar_t **v;
var = (cvar_t *) calloc (1, sizeof (cvar_t));
// Cvar doesn't exist, so we create it
var->name = strdup (name);
var->string = strdup (string);
var->flags = cvarflags;
var->callback = callback;
var->description = description;
var->value = atof (var->string);
var->int_val = atoi (var->string);
sscanf (var->string, "%f %f %f",
&var->vec[0], &var->vec[1], &var->vec[2]);
Hash_Add (cvar_hash, var);
for (v = &cvar_vars; *v; v = &(*v)->next)
if (strcmp ((*v)->name, var->name) >= 0)
break;
var->next = *v;
*v = var;
} else {
// Cvar does exist, so we update the flags and return.
var->flags &= ~CVAR_USER_CREATED;
var->flags |= cvarflags;
if (!var->callback)
var->callback = callback;
if (!var->description
|| strequal (var->description, USER_RO_CVAR)
|| strequal (var->description, USER_CVAR))
var->description = description;
}
if (var->callback)
var->callback (var);
return var;
}
/*
Cvar_SetFlags
sets a Cvar's flags simply and easily
*/
void
Cvar_SetFlags (cvar_t *var, int cvarflags)
{
if (var == NULL)
return;
var->flags = cvarflags;
}