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用C语言实现一个简单实用的单向链表list，具有一定的实际意义。尤其我们不想使用STL里面的list<...>类的时候。我实现的这个list，结点存储任何调用者分配的任意类型的数据（void*）。这个list适用于一些简单的场合，消耗极少的资源。
头文件：
/*
* list.h
* Generic sequential linked list node structure -- can hold any type data.
* cheungmine
* Sep. 22, 2007. All rights reserved.
*/
#ifndef LIST_H_INCLUDED
#define LIST_H_INCLUDED
#include "unistd.h"
typedef struct _listnode_t
{
struct _listnode_t *next;
union{
void* data;
struct _list_t *list;
const char *str;
long key;
};
}listnode_t;
typedef struct _list_t
{
size_t size; /* count of nodes */
listnode_t *head;
listnode_t *tail;
}list_t, *list_p;
/* A prototype of callbacked function called by list_destroy(), NULL for no use. */
typedef void(*pfcb_list_node_free)(listnode_t* node);
/* An example of free node data function implemented by callee:
void my_list_node_free(listnode_t *node)
{
free(node->data);
}
*/
/* Appends a node to a list */
extern void
list_append_node(list_t *in_list, listnode_t *in_node);
/* Removes the first node from a list and returns it */
extern listnode_t*
list_remove_head(list_t *in_list);
/* Removes all nodes but for list itself */
extern void
list_remove_all(list_t *in_list, pfcb_list_node_free pfunc /* NULL for no use or a key node */);
/* Returns a copy of a list_t from heap */
extern list_t*
list_copy(list_t in_list);
/* Concatenates two lists into first list. NOT freeing the second */
extern void
list_concat(list_t *first, list_t *second);
/* Allocates a new listnode_t from heap. NO memory allocated for input node_data */
extern listnode_t*
list_node_create(void* node_data);
/* Allocates a new listnode_t with a key node type */
extern listnode_t*
list_key_create(long node_key);
/* Allocates a empty list_t from heap */
extern list_t*
list_create();
/* Frees in_list's all nodes and destroys in_list from heap.
* the callee is responsible for freeing node data.
* the node freed-function(pfunc) is called by list_destroy.
*/
extern void
list_destroy(list_t *in_list, pfcb_list_node_free pfunc /* NULL for no use or a key node */);
/* Gets count of nodes in the list */
extern size_t
list_size(const list_t* in_list);
/* Gets node by index 0-based. 0 is head */
extern listnode_t*
list_node_at(const list_t* in_list, int index);
#endif /* LIST_H_INCLUDED */
实现文件：
/*
* list.c
* Generic linked list implementation.
* cheungmine
* Sep. 22, 2007. All rights reserved.
*/
#include "list.h"
/* Appends a node to a list */
void
list_append_node(list_t *in_list, listnode_t *node)
{
node->next = NULL;
if (in_list->head)
{
in_list->tail->next = node;
in_list->tail = node;
}
else
in_list->head = in_list->tail = node;
in_list->size++;
}
/* Removes the first node from a list and returns it */
listnode_t*
list_remove_head(list_t *in_list)
{
listnode_t *node = NULL;
if (in_list->head)
{
node = in_list->head;
in_list->head = in_list->head->next;
if (in_list->head == NULL)
in_list->tail = NULL;
node->next = NULL;
in_list->size--;
}
assert(in_list->size >= 0);
return node;
}
/* Removes all nodes but for list itself */
void
list_remove_all(list_t *in_list, pfcb_list_node_free pf)
{
listnode_t *node;
while((node = list_remove_head(in_list))){
if (pf) (*pf)(node);
free(node);
}
assert (in_list->size==0);
}
/* Returns a copy of a list_t from heap */
list_t*
list_copy(list_t list)
{
list_t *newlist = (list_t*)malloc (sizeof(list_t));
*newlist = list;
return newlist;
}
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