strlist_next
(cp = strlist_next(sl, len, &cursor)) != NULL; ) {
assert((cp = strlist_next(sl, slsize, &cursor)) != NULL);
assert((cp = strlist_next(sl, slsize, &cursor)) != NULL);
assert((cp = strlist_next(sl, slsize, &cursor)) != NULL);
assert((cp = strlist_next(sl, slsize, &cursor)) != NULL);
assert((cp = strlist_next(sl, slsize, &cursor)) != NULL);
assert((cp = strlist_next(sl, slsize, &cursor)) != NULL);
assert((cp = strlist_next(sl, slsize, &cursor)) == NULL);
const char * strlist_next(const char *, size_t, size_t *);