Implement q_new

Mike1117 · Mike1117 · commit fc2f58c5a0a4 · 2025-02-26T16:57:43.000+08:00
Using INIT_LIST_HEAD to allocate memory for a new queue.
If allocated FAILED, it will return NULL.

Change-Id: I3729cc166f4b5f9ba74f94a558a58fdf4c15cec4
diff --git a/queue.c b/queue.c
@@ -13,7 +13,12 @@
 /* Create an empty queue */
 struct list_head *q_new()
 {
-    return NULL;
+    struct list_head *new = malloc(sizeof(struct list_head));
+    if (!new)
+        return NULL;
+    INIT_LIST_HEAD(new);
+
+    return new;
 }
 
 /* Free all storage used by queue */

Original file line number	Diff line number	Diff line change
`@@ -13,7 +13,12 @@`
`13`	`13`	`/* Create an empty queue */`
`14`	`14`	`struct list_head *q_new()`
`15`	`15`	`{`
`16`		`- return NULL;`
	`16`	`+ struct list_head *new = malloc(sizeof(struct list_head));`
	`17`	`+ if (!new)`
	`18`	`+ return NULL;`
	`19`	`+ INIT_LIST_HEAD(new);`
	`20`	`+`
	`21`	`+ return new;`
`17`	`22`	`}`
`18`	`23`
`19`	`24`	`/* Free all storage used by queue */`