better handling of float cli arguments

funcs/utils.c

@@ -29,3 +29,16 @@ if (2 != foo) {
 return 2;
 }
 /* --------------------------------------------------------------------- */
+int parse_double(char *str, double *dptr)
+{
+double		value;
+int		foo;
+
+foo = sscanf(str, "%lf", &value);
+if (1 == foo) {
+	*dptr = value;
+	return 1;
+	}
+return -1;
+}
+/* --------------------------------------------------------------------- */