getIndex
char *str = getIndex(i, &len);
b.buf = getIndex(&o->index, &b.len);
char *getIndex(__nis_index_t *i, int *len);
index_string = getIndex(&s, end_s);
index_string = getIndex(&s, attrib_end);
static char *getIndex(const char **s_cur, const char *end_s);