This commits the performance mods that give the priority processing engine in the pbx, a 25-30% speed boost. The two updates used, are, first, to merge the ast_exists_extension() and the ast_spawn_extension() where they are called sequentially in a loop in the code, into a slightly upgraded version of ast_spawn_extension(), with a few extra args; and, second, I modified the substitute_variables_helper_full, so it zeroes out the byte after the evaluated string instead of demanding you pre-zero the buffer; I also went thru the code and removed the code that zeroed this buffer before every call to the substitute_variables_helper_full. The first fix provides about a 9% speedup, and the second the rest. These figures come from the 'PIPS' benchmark I describe in blogs, conf. reports, etc.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@88166 65c4cc65-6c06-0410-ace0-fbb531ad65f3

funcs/func_logic.c

@@ -157,7 +157,6 @@ static int acf_import(struct ast_channel *chan, const char *cmd, char *data, cha
 		AST_APP_ARG(varname);
 	);
 	AST_STANDARD_APP_ARGS(args, data);
-	memset(buf, 0, len);
 
 	if (!ast_strlen_zero(args.varname)) {
 		struct ast_channel *chan2 = ast_get_channel_by_name_locked(args.channel);