CMDBUF_LINELEN
mdb_free(cmd->cmd_history[i], CMDBUF_LINELEN);
mdb_free(cmd->cmd_linebuf, CMDBUF_LINELEN);
newhistory[i] = mdb_alloc(CMDBUF_LINELEN, UM_SLEEP);
cmd->cmd_linebuf = mdb_alloc(CMDBUF_LINELEN, UM_SLEEP);
cmd->cmd_history[i] = mdb_alloc(CMDBUF_LINELEN, UM_SLEEP);
cmd->cmd_linelen = CMDBUF_LINELEN;