-/*
- * function: change_field
- *
- * parameters:
- * (char *msg)
- * message to display as a prompt
- * (char **field)
- * a pointer to pointer which will point a new string. if the latter
- * pointer != NULL it will be freed (if user doesn't cancel)
- *
- * returns (int)
- * a nonzero value if user has cancelled and zero if user has typed a
- * valid string
- */
-