linux中的部分宏
*:first-child {
margin-top: 0 !important;
}
body>*:last-child {
margin-bottom: 0 !important;
}
/* BLOCKS
=============================================================================*/
p, blockquote, ul, ol, dl, table, pre {
margin: 15px 0;
}
/* HEADERS
=============================================================================*/
h1, h2, h3, h4, h5, h6 {
margin: 20px 0 10px;
padding: 0;
font-weight: bold;
-webkit-font-smoothing: antialiased;
}
h1 tt, h1 code, h2 tt, h2 code, h3 tt, h3 code, h4 tt, h4 code, h5 tt, h5 code, h6 tt, h6 code {
font-size: inherit;
}
h1 {
font-size: 28px;
color: #000;
}
h2 {
font-size: 24px;
border-bottom: 1px solid #ccc;
color: #000;
}
h3 {
font-size: 18px;
}
h4 {
font-size: 16px;
}
h5 {
font-size: 14px;
}
h6 {
color: #777;
font-size: 14px;
}
body>h2:first-child, body>h1:first-child, body>h1:first-child+h2, body>h3:first-child, body>h4:first-child, body>h5:first-child, body>h6:first-child {
margin-top: 0;
padding-top: 0;
}
a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 {
margin-top: 0;
padding-top: 0;
}
h1+p, h2+p, h3+p, h4+p, h5+p, h6+p {
margin-top: 10px;
}
/* LINKS
=============================================================================*/
a {
color: #4183C4;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
/* LISTS
=============================================================================*/
ul, ol {
padding-left: 30px;
}
ul li > :first-child,
ol li > :first-child,
ul li ul:first-of-type,
ol li ol:first-of-type,
ul li ol:first-of-type,
ol li ul:first-of-type {
margin-top: 0px;
}
ul ul, ul ol, ol ol, ol ul {
margin-bottom: 0;
}
dl {
padding: 0;
}
dl dt {
font-size: 14px;
font-weight: bold;
font-style: italic;
padding: 0;
margin: 15px 0 5px;
}
dl dt:first-child {
padding: 0;
}
dl dt>:first-child {
margin-top: 0px;
}
dl dt>:last-child {
margin-bottom: 0px;
}
dl dd {
margin: 0 0 15px;
padding: 0 15px;
}
dl dd>:first-child {
margin-top: 0px;
}
dl dd>:last-child {
margin-bottom: 0px;
}
/* CODE
=============================================================================*/
pre, code, tt {
font-size: 12px;
font-family: Consolas, "Liberation Mono", Courier, monospace;
}
code, tt {
margin: 0 0px;
padding: 0px 0px;
white-space: nowrap;
border: 1px solid #eaeaea;
background-color: #f8f8f8;
border-radius: 3px;
}
pre>code {
margin: 0;
padding: 0;
white-space: pre;
border: none;
background: transparent;
}
pre {
background-color: #f8f8f8;
border: 1px solid #ccc;
font-size: 13px;
line-height: 19px;
overflow: auto;
padding: 6px 10px;
border-radius: 3px;
}
pre code, pre tt {
background-color: transparent;
border: none;
}
kbd {
-moz-border-bottom-colors: none;
-moz-border-left-colors: none;
-moz-border-right-colors: none;
-moz-border-top-colors: none;
background-color: #DDDDDD;
background-image: linear-gradient(#F1F1F1, #DDDDDD);
background-repeat: repeat-x;
border-color: #DDDDDD #CCCCCC #CCCCCC #DDDDDD;
border-image: none;
border-radius: 2px 2px 2px 2px;
border-style: solid;
border-width: 1px;
font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
line-height: 10px;
padding: 1px 4px;
}
/* QUOTES
=============================================================================*/
blockquote {
border-left: 4px solid #DDD;
padding: 0 15px;
color: #777;
}
blockquote>:first-child {
margin-top: 0px;
}
blockquote>:last-child {
margin-bottom: 0px;
}
/* HORIZONTAL RULES
=============================================================================*/
hr {
clear: both;
margin: 15px 0;
height: 0px;
overflow: hidden;
border: none;
background: transparent;
border-bottom: 4px solid #ddd;
padding: 0;
}
/* TABLES
=============================================================================*/
table th {
font-weight: bold;
}
table th, table td {
border: 1px solid #ccc;
padding: 6px 13px;
}
table tr {
border-top: 1px solid #ccc;
background-color: #fff;
}
table tr:nth-child(2n) {
background-color: #f8f8f8;
}
/* IMAGES
=============================================================================*/
img {
max-width: 100%
}
-->
链表
struct list_head{
struct list_head *next,*prev;}
链表声明
#define LIST_HEAD_INIT(name) {&(name),&(name)}
================================================
1.静态初始化
#define LIST_HEAD(name)
struct list_head name = LIST_HEAD_INIT(name)
=================================================
LIST_HEAD(list_name);
==>
struct list_head list_name = LIST_HEAD_INIT(name);
==>
struct list_head list_name = {&(list_name), &(list_name)};
//相当于给一个结构声明加初始化,让list_name的成员变量
//【next,prev】 = {&(list_name), &(list_name)}
2.运行时初始化
stattic inline void INIT_LIST_HEAD(struct list_head *list)
{
list->next = list;
list->prev = list;
}
链表是否为空
static inline int list_empty(const struct list_head* head)
{
return head->next == head;
}
链表插入
1.插入head后
static inline void list_add(struct list_head* new, struct list_head* head)
{
__list_add(new, head, head->next);
}
2.插入head->prev后
static inline void list_add_tail(struct list_head* new, struct list_head* head)
{
__list_add(new, head->prev, head);
}
删除
static inline void list_replace_init(struct list_head *old, struct list_head *new)
{
list_replace(old,new);
INIT_LIST_HEAD(old);
}
遍历
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)
#define container_of(ptr, type, member) \
{\
const typeof( ((type *)0)->member ) *__mptr = (ptr);\
(type *)( (char *)__mptr - offsetof(type,member) ); \
}
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
注意:为什么能这么实现,跟C语言特性很有关系,在C中,给定的结构中,成员的偏移在编译时被固定下来了。
遍历链表:
宏:list_for_each()
#define list_for_each(pos, head) \
for (pos = (head)->next, prefetch(pos->next); \
pos != (head); \
pos = pos->next, prefetch(pos->next))
pos是迭代指针,指向当前访问的链表头。
head是要访问的链表的链表头。
结合list_entry使用,就可以访问链表头所在元素了。
list_for_each(p,&elem_list){
f = list_entry(p, struct elem, list);
}
更简单使用:
宏:list_for_each_entry(pos,head,member)
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