From d69e38b759b5530ae1a96880e1d512be55ad9fe3 Mon Sep 17 00:00:00 2001
From: Aaron Liao <aftuta85@gmail.com>
Date: Sat, 16 Mar 2024 15:48:52 +0800
Subject: [PATCH] Implement q_size function

Implement q_size() to get the size of the queue.
---
 queue.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/queue.c b/queue.c
index ce85f7d16..eac0cdce6 100644
--- a/queue.c
+++ b/queue.c
@@ -47,7 +47,14 @@ element_t *q_remove_tail(struct list_head *head, char *sp, size_t bufsize)
 /* Return number of elements in queue */
 int q_size(struct list_head *head)
 {
-    return -1;
+    if (!head)
+        return 0;
+
+    int size = 0;
+    struct list_head *curr;
+    list_for_each (curr, head)
+        size++;
+    return size;
 }
 
 /* Delete the middle node in queue */