FM_SYM_SZ
char buf[FM_STK_DEPTH * FM_SYM_SZ];
for (i = 0; i < depth && i != FM_STK_DEPTH; i++, stkp += FM_SYM_SZ) {
(void) snprintf(stkp, FM_SYM_SZ, "%s+%lx", sym, off);
(void) snprintf(stkp, FM_SYM_SZ, "%lx", (long)stack[i]);