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Queue.c
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Queue.c
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#include "Queue.h"
int InitQueue(LinkQueue *Q, size_t value_size){
Q->front = Q->rear = (QueuePtr)malloc_safe(Q->front, sizeof(QNode));
Q->front->pointer = (void*)malloc_safe(Q->front->pointer, value_size);
if(!Q->front)return ERROR;
Q->value_size=value_size;
Q->front->next=NULL;
return OK;
}
int EnQueue(LinkQueue *Q, void *pointer){
QNode *p = (QueuePtr)malloc_safe(p, sizeof(QNode));//malloc由编译器分配空间的间隔会自动大于等于20!!
if(!p)return ERROR;
p->pointer=(void*)malloc_safe(p->pointer, Q->value_size);
if(!p->pointer)return ERROR;
memcpy(p->pointer,pointer,Q->value_size);//p->pointer=pointer;
p->next=NULL;
Q->rear->next=p;
Q->rear=p;
return OK;
}
int DeQueue(LinkQueue *Q, void *pointer){
QNode *p;
if(Q->front==Q->rear){return ERROR;}
p=Q->front->next;
memcpy(pointer,p->pointer,Q->value_size);//pointer=p->pointer;
Q->front->next=p->next;
if(Q->rear==p)
Q->rear=Q->front;
free_safe(p->pointer);
free_safe(p);
return OK;
}
int DestroyQueue(LinkQueue *Q){
while (Q->front){
Q->rear = Q->front->next;
free_safe(Q->front->pointer);
free_safe(Q->front);
Q->front=Q->rear;
}//end while
return OK;
}
int QueueLength(LinkQueue *Q){
QNode *p=Q->front;
int length=0;
while((p = p->next)){
length++;
}
return length;
}