Time for an 2014 update…

Task/Queue-Definition/C/queue-definition-1.c

@@ -4,47 +4,47 @@
 
 typedef int DATA; /* type of data to store in queue */
 typedef struct {
-	DATA *buf;
-	size_t head, tail, alloc;
+    DATA *buf;
+    size_t head, tail, alloc;
 } queue_t, *queue;
 
 queue q_new()
 {
-	queue q = malloc(sizeof(queue_t));
-	q->buf = malloc(sizeof(DATA) * (q->alloc = 4));
-	q->head = q->tail = 0;
-	return q;
+    queue q = malloc(sizeof(queue_t));
+    q->buf = malloc(sizeof(DATA) * (q->alloc = 4));
+    q->head = q->tail = 0;
+    return q;
 }
 
 int empty(queue q)
 {
-	return q->tail == q->head;
+    return q->tail == q->head;
 }
 
 void enqueue(queue q, DATA n)
 {
-	if (q->tail >= q->alloc) q->tail = 0;
-	q->buf[q->tail++] = n;
-	if (q->tail == q->head) {  /* needs more room */
-		q->buf = realloc(q->buf, sizeof(DATA) * q->alloc * 2);
-		if (q->head) {
-			memcpy(q->buf + q->head + q->alloc, q->buf + q->head,
-				sizeof(DATA) * (q->alloc - q->head));
-			q->head += q->alloc;
-		} else
-			q->tail = q->alloc;
-		q->alloc *= 2;
-	}
+    if (q->tail >= q->alloc) q->tail = 0;
+    q->buf[q->tail++] = n;
+    if (q->tail == q->head) {  /* needs more room */
+        q->buf = realloc(q->buf, sizeof(DATA) * q->alloc * 2);
+        if (q->head) {
+            memcpy(q->buf + q->head + q->alloc, q->buf + q->head,
+                sizeof(DATA) * (q->alloc - q->head));
+            q->head += q->alloc;
+        } else
+            q->tail = q->alloc;
+        q->alloc *= 2;
+    }
 }
 
 int dequeue(queue q, DATA *n)
 {
-	if (q->head == q->tail) return 0;
-	*n = q->buf[q->head++];
-	if (q->head >= q->alloc) { /* reduce allocated storage no longer needed */
-		q->head = 0;
-		if (q->alloc >= 512 && q->tail < q->alloc / 2)
-			q->buf = realloc(q->buf, sizeof(DATA) * (q->alloc/=2));
-	}
-	return 1;
+    if (q->head == q->tail) return 0;
+    *n = q->buf[q->head++];
+    if (q->head >= q->alloc) { /* reduce allocated storage no longer needed */
+        q->head = 0;
+        if (q->alloc >= 512 && q->tail < q->alloc / 2)
+            q->buf = realloc(q->buf, sizeof(DATA) * (q->alloc/=2));
+    }
+    return 1;
 }