# 2021-04-06 yuchun1214

## 測驗 `1`

static void run(char *c, int t)
{
    char *redir_stdin = NULL, *redir_stdout = NULL;
    int pipefds[2] = {0, 0}, outfd = 0;
    char *v[99] = {0};
    char **u = &v[98]; /* end of words */
    for (;;) {
        c--;
        if (is_delim(*c)) /* if NULL (start of string) or pipe: break */
            break;
        if (!is_special(*c)) {
            c++; /* Copy word of regular chars into previous u */
            // XXXXX /* 在此提交你的程式碼 */
            /****************************/
            --u;
            if (is_blank(*c))
                *c = '\0';
            while (!is_special(*--c))
                *u = c;
            /***************************/
        }
        if (is_redir(*c)) { /* If < or > */
            if (*c == '<')
                redir_stdin = *u;
            else
                redir_stdout = *u;
            if ((u - v) != 98)
                u++;
        }
    }
    if ((u - v) == 98) /* empty input */
        return;

輸出結果：

➜  quiz7 gcc picosh.c
➜  quiz7 ./a.out
$ mkdir dir
$ ls
a.out  dir  http  picosh.c
$ echo hello world > x
$ cat < x | grep hello
hello world
$ ls /dev | wc -l
243
$

:::warning
文字訊息不要用圖片展現！
:notes: jserv
:::

## 測驗 `2`
<!--

static void dequeue(queue_t *q, int *fd)
{
    node_t *old_head;
    pthread_mutex_lock(q->head_lock);
    /* Wait until signaled that queue is non_empty.
     * Need while loop in case a new thread manages to steal the queue
     * element after the waiting thread is signaled, but before it can
     * re-acquire head_lock.
     */
    // XXXXX /* 在此提交你的程式碼 */;
	pthread_cond_wait(q->non_empty, q->tail_lock);
	old_head = q->head;
	q->head = q->head->next;
	*fd = old_head->fd;
	free(old_head);
	pthread_mutex_unlock(q->head_lock);
}

-->