From: cloudwalk <cloudwalk@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Wed, 3 Jun 2020 15:28:17 +0000 (+0000)
Subject: Implement cvar callback functionality
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=9e9074d0ea349fb16cfdd492df66b8683a62f4b7;p=xonotic%2Fdarkplaces.git

Implement cvar callback functionality

With these, cvars can run arbitrary functions to bounds-check themselves or
perform some other task such as cleanup. Use the function Cvar_RegisterCallback.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12629 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/cvar.c b/cvar.c
index affdc556..be6ed386 100644
--- a/cvar.c
+++ b/cvar.c
@@ -349,21 +349,28 @@ static void Cvar_SetQuick_Internal (cvar_t *var, const char *value)
 	qboolean changed;
 	size_t valuelen;
 	char vabuf[1024];
+	char new_value[MAX_INPUTLINE];
 
 	changed = strcmp(var->string, value) != 0;
 	// LadyHavoc: don't reallocate when there is no change
 	if (!changed)
 		return;
 
+	memcpy(new_value,value,MAX_INPUTLINE);
+	
+	// Call the function stored in the cvar for bounds checking, cleanup, etc
+	if (var->callback)
+		var->callback(new_value);
+
 	// LadyHavoc: don't reallocate when the buffer is the same size
-	valuelen = strlen(value);
+	valuelen = strlen(new_value);
 	if (!var->string || strlen(var->string) != valuelen)
 	{
 		Z_Free ((char *)var->string);	// free the old value string
 
 		var->string = (char *)Z_Malloc (valuelen + 1);
 	}
-	memcpy ((char *)var->string, value, valuelen + 1);
+	memcpy ((char *)var->string, new_value, valuelen + 1);
 	var->value = atof (var->string);
 	var->integer = (int) var->value;
 	if ((var->flags & CVAR_NOTIFY) && changed && sv.active && !sv_disablenotify.integer)
@@ -482,6 +489,11 @@ void Cvar_SetValue(cvar_state_t *cvars, const char *var_name, float value)
 	Cvar_Set(cvars, var_name, val);
 }
 
+void Cvar_RegisterCallback(cvar_t *variable, void (*callback)(char *))
+{
+	variable->callback = callback;
+}
+
 /*
 ============
 Cvar_RegisterVariable
diff --git a/cvar.h b/cvar.h
index 4838824c..2bbcd1dc 100644
--- a/cvar.h
+++ b/cvar.h
@@ -131,6 +131,8 @@ typedef struct cvar_s
 
 	const char *defstring;
 
+	void (*callback)(char *value);
+
 	// values at init (for Cvar_RestoreInitState)
 	qboolean initstate; // indicates this existed at init
 	int initflags;
@@ -170,6 +172,8 @@ void Cvar_MenuOption(cvar_t *variable, int menu, int value[16], const char *name
 
 /// registers a cvar that already has the name, string, and optionally the
 /// archive elements set.
+void Cvar_RegisterCallback(cvar_t *variable, void (*callback)(char *));
+
 void Cvar_RegisterVariable(cvar_t *variable);
 
 /// equivelant to "<name> <variable>" typed at the console