-/* Returns message: "Trouble in ".parent." with ".child."." (try_*() helper) */
-extern char * trouble_msg(char * parent, char * child);
+/* Return 16-bit number pseudo-randomly generated via Linear Congruential
+ * Generator algorithm with some proven constants. Use instead of rand() to
+ * ensure portability of the same pseudo-randomness across systems.
+ */
+extern uint16_t rrand();
+
+/* Do exit_err() with message: "Trouble in ".parent." with ".child."." */
+extern void exit_trouble(uint8_t test, char * parent, char * child);
/* Wrappers to malloc(), calloc() from function called "f" calling exit_err()
* with trouble_msg() error message if necessary.