c - 如何释放单链表中的内存

Question

关于如何在 FreeList 函数中释放为 char * 分配的内存(在 CreateList 函数中分配)有什么建议吗？

基本上，我会将 CreateList 中的根作为函数参数返回给 FreeList 函数。

我尝试使用

temp = head;
head = head->next;
free(temp->str);        
free(temp);     

但它也失败了。

LIST *CreateList(FILE *fp) 
{
    /* Variable declaration */
    char input[BUFF];
    LIST *root = NULL;
    size_t strSize;    
    LIST *newList;            

    /* Read till end of file */
    while (fscanf(fp, "%255s", input) != EOF) 
    {
        strSize = strlen(input) + 1;

        /* Function to determine if we shud create a new node or increment node count */
        if (!ListSame(root, input))  
        {
            /* New node */
            if ((newList = (LIST *)malloc(sizeof(LIST))) == NULL) 
            {
                printf("Out of memory...");
                exit(EXIT_FAILURE);
            } 
           if ((newList->str = (char *)malloc(sizeof(strSize))) == NULL) 
            {
               printf("Not enough memory for %s", input);
               exit(EXIT_FAILURE);
            }
            memcpy(newList->str, input, strSize);
            newList->count = 1;
           //determine if it is root
           if (root == NULL)
           {
               newList->next = NULL;
               root = newList;
               }
               else
               {
                   newList->next = root->next;
                   root->next = newList;
               }
           }
        }
    return root;
}


  void FreeList(LIST *head)
  {
      LIST *temp = NULL;
      char* str;
      /* loop from root till end */
      while (head != NULL)
      {  
          temp = head;
          str = temp->str;
          head = head->next;
          free(str);
          free(temp);         
      }
 }

Answer 1

void FreeList(LIST *head)
{
    LIST *temp = NULL;
    /* loop from root till end */
    while (head != NULL)
    {  
       temp = head;
       head = head->next;     
       free(temp->str); /* Free the string does not matter if str is null */   
       free(temp);
       /* How do i free the dynamic allocated memory for char * */         
    }
}

我认为你应该寻找。