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_cut.c

@@ -141,7 +141,6 @@ static int cut_internal(struct ast_channel *chan, char *data, char *buffer, size
 
 		if (tmp) {
 			snprintf(tmp, strlen(args.varname) + 4, "${%s}", args.varname);
-			memset(varvalue, 0, sizeof(varvalue));
 		} else {
 			return ERROR_NOMEM;
 		}