3811 lines
173 KiB
HTML
3811 lines
173 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
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<meta name=Generator content="Microsoft Word 14 (filtered)">
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<style>
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p
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pre
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tt
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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{mso-style-name:"图中文字小5号 Char2";
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|
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{mso-style-name:"图中文字3 Char Char Char Char";
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|
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|
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|
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p.post3, li.post3, div.post3
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{mso-style-name:邮件post3;
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|
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|
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|
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|
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|
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|
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{mso-style-name:列表8;
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|
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{mso-style-name:图说明10;
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|
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{mso-style-name:图说明13;
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|
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|
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{mso-style-name:附录3;
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|
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|
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|
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|
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|
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|
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{mso-style-name:索引标题1;
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|
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|
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|
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|
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|
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{mso-style-name:"图说明14 Char";
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{mso-style-name:FigureTitle;
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{mso-style-name:TableTitle;
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{mso-style-name:ProgramTitle;
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{mso-style-name:表中文字小五;
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{mso-style-name:关键词;
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{mso-style-name:"关键词 Char";
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{mso-style-name:文件名;
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span.Char4
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{mso-style-name:"文件名 Char";
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{mso-style-name:选项;
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span.Char5
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{mso-style-name:"选项 Char";
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{mso-style-name:命令行;
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span.Char6
|
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{mso-style-name:"命令行 Char";
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mso-style-link:命令行;
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{mso-style-name:函数名;
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span.Char7
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{mso-style-name:"函数名 Char";
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span.Char8
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{mso-style-name:"寄存器名 Char";
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|
||
{mso-style-name:"变量名 Char";
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mso-style-link:变量名;
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|
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|
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|
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|
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|
||
{mso-style-name:图中文字小5号靠左;
|
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|
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|
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|
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|
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{mso-style-name:"样式 代码程序 + 左侧\: 9\.26 厘米";
|
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|
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|
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|
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|
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span.5Char4
|
||
{mso-style-name:"标题 5 Char";
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mso-style-link:"标题 5";
|
||
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|
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span.6Char0
|
||
{mso-style-name:"标题 6 Char";
|
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mso-style-link:"标题 6";
|
||
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|
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|
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span.7Char
|
||
{mso-style-name:"标题 7 Char";
|
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mso-style-link:"标题 7";
|
||
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|
||
span.8Char
|
||
{mso-style-name:"标题 8 Char";
|
||
mso-style-link:"标题 8";
|
||
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|
||
span.9Char
|
||
{mso-style-name:"标题 9 Char";
|
||
mso-style-link:"标题 9";
|
||
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|
||
span.Chara
|
||
{mso-style-name:"脚注文本 Char";
|
||
mso-style-link:脚注文本;
|
||
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|
||
span.Charb
|
||
{mso-style-name:"批注文字 Char";
|
||
mso-style-link:批注文字;
|
||
font-family:宋体;}
|
||
span.Charc
|
||
{mso-style-name:"页眉 Char";
|
||
mso-style-link:页眉;
|
||
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|
||
span.Chard
|
||
{mso-style-name:"页脚 Char";
|
||
mso-style-link:页脚;
|
||
font-family:宋体;}
|
||
span.Chare
|
||
{mso-style-name:"日期 Char";
|
||
mso-style-link:日期;
|
||
font-family:宋体;}
|
||
span.HTMLChar
|
||
{mso-style-name:"HTML 预设格式 Char\,HTML 预先格式化 Char\,HTML 预先格式化1 Char\,HTML 预先格式化2 Char\,HTML 预先格式化3 Char";
|
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mso-style-link:"HTML 预设格式\,HTML 预先格式化\,HTML 预先格式化1\,HTML 预先格式化2\,HTML 预先格式化3";
|
||
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|
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span.Charf
|
||
{mso-style-name:"批注主题 Char";
|
||
mso-style-link:批注主题;
|
||
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|
||
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|
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span.Charf0
|
||
{mso-style-name:"批注框文本 Char";
|
||
mso-style-link:批注框文本;
|
||
font-family:宋体;}
|
||
span.3CharChar1
|
||
{mso-style-name:"图中文字3 Char Char1";
|
||
font-family:宋体;}
|
||
span.3CharChar3
|
||
{mso-style-name:"图中文字3 Char Char3";
|
||
font-family:宋体;}
|
||
span.3CharCharChar1
|
||
{mso-style-name:"图中文字3 Char Char Char1";
|
||
font-family:宋体;}
|
||
span.3CharChar1Char
|
||
{mso-style-name:"图中文字3 Char Char1 Char";
|
||
font-family:宋体;}
|
||
.MsoChpDefault
|
||
{font-size:10.0pt;}
|
||
/* Page Definitions */
|
||
@page WordSection1
|
||
{size:595.3pt 841.9pt;
|
||
margin:72.0pt 54.0pt 72.0pt 54.0pt;
|
||
layout-grid:15.6pt;}
|
||
div.WordSection1
|
||
{page:WordSection1;}
|
||
/* List Definitions */
|
||
ol
|
||
{margin-bottom:0cm;}
|
||
ul
|
||
{margin-bottom:0cm;}
|
||
-->
|
||
</style>
|
||
|
||
</head>
|
||
|
||
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
|
||
|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320663"><span style='font-family:黑体'>程序</span><span
|
||
lang=EN-US>14-9 linux/include/string.h</span></a></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>1</span></u>
|
||
#ifndef <u><span style='color:blue'>_STRING_H_</span></u></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>2</span></u>
|
||
#define <u><span style='color:blue'>_STRING_H_</span></u></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u>
|
||
#ifndef <u><span style='color:blue'>NULL</span></u></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u>
|
||
#define <u><span style='color:blue'>NULL</span></u> ((void *) 0)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u>
|
||
#endif</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u>
|
||
#ifndef <u><span style='color:blue'>_SIZE_T</span></u></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u>
|
||
#define <u><span style='color:blue'>_SIZE_T</span></u></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u>
|
||
typedef unsigned int <u><span style='color:blue'>size_t</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</span></u>
|
||
#endif</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>12</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u>
|
||
extern char * <u><span style='color:blue'>strerror</span></u>(int <u><span
|
||
style='color:blue'>errno</span></u>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u> <b><i> *
|
||
This string-include defines all string functions as inline</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u> <b><i> *
|
||
functions. Use gcc. It also assumes ds=es=data space, this should be</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u> <b><i> *
|
||
normal. Most of the string-functions are rather heavily hand-optimized,</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u> <b><i> *
|
||
see especially strtok,strstr,str[c]spn. They should work, but are not</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u> <b><i> *
|
||
very easy to understand. Everything is done entirely within the register</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u> <b><i> *
|
||
set, making the functions fast and clean. String instructions have been</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u> <b><i> *
|
||
used through-out, making for "slightly" unclear code :-)</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u> <b><i> *
|
||
(C) 1991 Linus Torvalds</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>这个字符串头文件以内嵌函数的形式定义了所有字符串操作函数。使用<span
|
||
lang=EN-US>gcc</span>时，同时</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>假定了<span
|
||
lang=EN-US>ds=es=</span>数据空间，这应该是常规的。绝大多数字符串函数都是经手工进行大量</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>优化的，尤其是函数<span
|
||
lang=EN-US>strtok</span>、<span lang=EN-US>strstr</span>、<span lang=EN-US>str[c]spn</span>。它们应该能正常工作，但却不是那</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>么容易理解。所有的操作基本上都是使用寄存器集来完成的，这使得函数即快又整洁。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>所有地方都使用了字符串指令，这又使得代码“稍微”难以理解<span
|
||
lang=EN-US style='font-family:Wingdings'>J</span></p>
|
||
|
||
<p class=a><span lang=EN-US> *</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*
|
||
(C) 1991 Linus Torvalds</span></p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u>
|
||
</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>将一个字符串<span
|
||
lang=EN-US>(src)</span>拷贝到另一个字符串<span lang=EN-US>(dest)</span>，直到遇到<span
|
||
lang=EN-US>NULL</span>字符后停止。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dest
|
||
- </span>目的字符串指针，<span lang=EN-US>src - </span>源字符串指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - esi(src)</span>，<span
|
||
lang=EN-US>%1 - edi(dest)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
extern inline char * <u><span style='color:blue'>strcpy</span></u>(char *
|
||
dest,const char *src)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u>
|
||
__asm__(<i>"cld\n"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u>
|
||
<i>"1:\tlodsb\n\t"</i>
|
||
// </span>加载<span lang=EN-US>DS:[esi]</span>处<span lang=EN-US>1</span>字节<span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并更新<span
|
||
lang=EN-US>esi</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u>
|
||
<i>"stosb\n\t"</i>
|
||
// </span>存储字节<span lang=EN-US>al</span><span lang=EN-US style='font-family:
|
||
Wingdings'>è</span><span lang=EN-US>ES:[edi]</span>，并更新<span lang=EN-US>edi</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
<i>"testb %%al,%%al\n\t"</i>
|
||
// </span>刚存储的字节是<span lang=EN-US>0</span>？</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
<i>"jne 1b"</i>
|
||
// </span>不是则向后跳转到标号<span lang=EN-US>1</span>处，否则结束。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
::<i>"S"</i> (src),<i>"D"</i> (dest):<i>"si"</i>,<i>"di"</i>,<i>"ax"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
return dest;
|
||
// </span>返回目的字符串指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>拷贝源字符串<span
|
||
lang=EN-US>count</span>个字节到目的字符串。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果源串长度小于<span
|
||
lang=EN-US>count</span>个字节，就附加空字符<span lang=EN-US>(NULL)</span>到目的字符串。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dest
|
||
- </span>目的字符串指针，<span lang=EN-US>src - </span>源字符串指针，<span lang=EN-US>count - </span>拷贝字节数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - esi(src)</span>，<span
|
||
lang=EN-US>%1 - edi(dest)</span>，<span lang=EN-US>%2 - ecx(count)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u>
|
||
extern inline char * <u><span style='color:blue'>strncpy</span></u>(char *
|
||
dest,const char *src,int <u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u>
|
||
__asm__(<i>"cld\n"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u>
|
||
<i>"1:\tdecl %2\n\t"</i>
|
||
// </span>寄存器<span lang=EN-US>ecx--</span>（<span lang=EN-US>count--</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u>
|
||
<i>"js 2f\n\t"</i> // </span>如果<span
|
||
lang=EN-US>count<0</span>则向前跳转到标号<span lang=EN-US>2</span>，结束。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u>
|
||
<i>"lodsb\n\t"</i>
|
||
// </span>取<span lang=EN-US>ds:[esi]</span>处<span lang=EN-US>1</span>字节<span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u>
|
||
<i>"stosb\n\t"</i>
|
||
// </span>存储该字节<span lang=EN-US style='font-family:Wingdings'>è</span><span
|
||
lang=EN-US>es:[edi]</span>，并且<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u>
|
||
<i>"testb %%al,%%al\n\t"</i>
|
||
// </span>该字节是<span lang=EN-US>0</span>？</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u>
|
||
<i>"jne 1b\n\t"</i>
|
||
// </span>不是，则向前跳转到标号<span lang=EN-US>1</span>处继续拷贝。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u>
|
||
<i>"rep\n\t"</i>
|
||
// </span>否则，在目的串中存放剩余个数的空字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u>
|
||
<i>"stosb\n"</i></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u>
|
||
<i>"2:"</i></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u>
|
||
::<i>"S"</i> (src),<i>"D"</i> (dest),<i>"c"</i> (<u><span
|
||
style='color:blue'>count</span></u>):<i>"si"</i>,<i>"di"</i>,<i>"ax"</i>,<i>"cx"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
return dest;
|
||
// </span>返回目的字符串指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>将源字符串拷贝到目的字符串的末尾处。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dest
|
||
- </span>目的字符串指针，<span lang=EN-US>src - </span>源字符串指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - esi(src)</span>，<span
|
||
lang=EN-US>%1 - edi(dest)</span>，<span lang=EN-US>%2 - eax(0)</span>，<span
|
||
lang=EN-US>%3 - ecx(-1)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
extern inline char * <u><span style='color:blue'>strcat</span></u>(char *
|
||
dest,const char * src)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u>
|
||
__asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u>
|
||
<i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al</span>与<span lang=EN-US>es:[edi]</span>字节，并更新<span
|
||
lang=EN-US>edi++</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
<i>"scasb\n\t"</i>
|
||
// </span>直到找到目的串中是<span lang=EN-US>0</span>的字节，此时<span lang=EN-US>edi</span>已指向后<span
|
||
lang=EN-US>1</span>字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u>
|
||
<i>"decl %1\n"</i>
|
||
// </span>让<span lang=EN-US>es:[edi]</span>指向<span lang=EN-US>0</span>值字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
<i>"1:\tlodsb\n\t"</i>
|
||
// </span>取源字符串字节<span lang=EN-US>ds:[esi]</span><span lang=EN-US
|
||
style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
<i>"stosb\n\t"</i>
|
||
// </span>将该字节存到<span lang=EN-US>es:[edi]</span>，并<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u>
|
||
<i>"testb %%al,%%al\n\t"</i>
|
||
// </span>该字节是<span lang=EN-US>0</span>？</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
<i>"jne 1b"</i>
|
||
// </span>不是，则向后跳转到标号<span lang=EN-US>1</span>处继续拷贝，否则结束。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
::<i>"S"</i> (src),<i>"D"</i> (dest),<i>"a"</i>
|
||
(0),<i>"c"</i> (0xffffffff):<i>"si"</i>,<i>"di"</i>,<i>"ax"</i>,<i>"cx"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u>
|
||
return dest;
|
||
// </span>返回目的字符串指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>将源字符串的<span
|
||
lang=EN-US>count</span>个字节复制到目的字符串的末尾处，最后添一空字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dest
|
||
- </span>目的字符串，<span lang=EN-US>src - </span>源字符串，<span lang=EN-US>count - </span>欲复制的字节数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - esi(src)</span>，<span
|
||
lang=EN-US>%1 - edi(dest)</span>，<span lang=EN-US>%2 - eax(0)</span>，<span
|
||
lang=EN-US>%3 - ecx(-1)</span>，<span lang=EN-US>%4 - (count)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u>
|
||
extern inline char * <u><span style='color:blue'>strncat</span></u>(char *
|
||
dest,const char * src,int <u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u>
|
||
__asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u>
|
||
<i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al</span>与<span lang=EN-US>es:[edi]</span>字节，<span
|
||
lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u>
|
||
<i>"scasb\n\t"</i>
|
||
// </span>直到找到目的串的末端<span lang=EN-US>0</span>值字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u>
|
||
<i>"decl %1\n\t"</i>
|
||
// edi</span>指向该<span lang=EN-US>0</span>值字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u>
|
||
<i>"movl %4,%3\n"</i>
|
||
// </span>欲复制字节数<span lang=EN-US style='font-family:Wingdings'>è</span><span
|
||
lang=EN-US>ecx</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u>
|
||
<i>"1:\tdecl %3\n\t"</i>
|
||
// ecx--</span>（从<span lang=EN-US>0</span>开始计数）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u>
|
||
<i>"js 2f\n\t"</i> // ecx <0 ?</span>，是则向前跳转到标号<span
|
||
lang=EN-US>2</span>处。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u>
|
||
<i>"lodsb\n\t"</i>
|
||
// </span>否则取<span lang=EN-US>ds:[esi]</span>处的字节<span lang=EN-US
|
||
style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
<i>"stosb\n\t"</i>
|
||
// </span>存储到<span lang=EN-US>es:[edi]</span>处，<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
<i>"testb %%al,%%al\n\t"</i>
|
||
// </span>该字节值为<span lang=EN-US>0</span>？</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
<i>"jne 1b\n"</i> //
|
||
</span>不是则向后跳转到标号<span lang=EN-US>1</span>处，继续复制。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
<i>"2:\txorl %2,%2\n\t"</i>
|
||
// </span>将<span lang=EN-US>al</span>清零。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
<i>"stosb"</i>
|
||
// </span>存到<span lang=EN-US>es:[edi]</span>处。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
::<i>"S"</i> (src),<i>"D"</i> (dest),<i>"a"</i>
|
||
(0),<i>"c"</i> (0xffffffff),<i>"g"</i> (<u><span
|
||
style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
:<i>"si"</i>,<i>"di"</i>,<i>"ax"</i>,<i>"cx"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
return dest;
|
||
// </span>返回目的字符串指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>将一个字符串与另一个字符串进行比较。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>字符串<span lang=EN-US>1</span>，<span lang=EN-US>ct - </span>字符串<span
|
||
lang=EN-US>2</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - eax(__res)</span>返回值，<span
|
||
lang=EN-US>%1 - edi(cs)</span>字符串<span lang=EN-US>1</span>指针，<span lang=EN-US>%2
|
||
- esi(ct)</span>字符串<span lang=EN-US>2</span>指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：如果串<span
|
||
lang=EN-US>1 > </span>串<span lang=EN-US>2</span>，则返回<span lang=EN-US>1</span>；串<span
|
||
lang=EN-US>1 = </span>串<span lang=EN-US>2</span>，则返回<span lang=EN-US>0</span>；串<span
|
||
lang=EN-US>1 < </span>串<span lang=EN-US>2</span>，则返回<span lang=EN-US>-1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>90</span>行定义了一个局部寄存器变量。该变量将被保存在<span
|
||
lang=EN-US>eax</span>寄存器中，以便于高效访问和操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这种定义变量的方法主要用于内嵌汇编程序中。详细说明参见<span
|
||
lang=EN-US>gcc</span>手册<span lang=EN-US>“</span>指定寄存器中的变量<span lang=EN-US>”</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
extern inline int <u><span style='color:blue'>strcmp</span></u>(const char *
|
||
cs,const char * ct)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
register int __res __asm__(<i>"ax"</i>); // __res</span>是寄存器变量<span
|
||
lang=EN-US>(eax)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
__asm__(<i>"cld\n"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
<i>"1:\tlodsb\n\t"</i>
|
||
// </span>取字符串<span lang=EN-US>2</span>的字节<span lang=EN-US>ds:[esi]</span><span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
<i>"scasb\n\t"</i>
|
||
// al</span>与字符串<span lang=EN-US>1</span>的字节<span lang=EN-US>es:[edi]</span>作比较，并且<span
|
||
lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u>
|
||
<i>"jne 2f\n\t"</i> // </span>如果不相等，则向前跳转到标号<span
|
||
lang=EN-US>2</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
<i>"testb %%al,%%al\n\t"</i>
|
||
// </span>该字节是<span lang=EN-US>0</span>值字节吗（字符串结尾）？</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
<i>"jne 1b\n\t"</i>
|
||
// </span>不是，则向后跳转到标号<span lang=EN-US>1</span>，继续比较。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
<i>"xorl %%eax,%%eax\n\t"</i> // </span>是，则返回值<span
|
||
lang=EN-US>eax</span>清零，</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
<i>"jmp 3f\n"</i> // </span>向前跳转到标号<span
|
||
lang=EN-US>3</span>，结束。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
<i>"2:\tmovl $1,%%eax\n\t"</i> // eax</span>中置<span
|
||
lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US> <i>"jl 3f\n\t"</i> // </span>若前面比较中串<span lang=EN-US>2</span>字符<span
|
||
lang=EN-US><</span>串<span lang=EN-US>1</span>字符，则返回正值结束。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US> <i>"negl
|
||
%%eax\n"</i>
|
||
// </span>否则<span lang=EN-US>eax = -eax</span>，返回负值，结束。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US> <i>"3:"</i></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US> :<i>"=a"</i>
|
||
(__res):<i>"D"</i> (cs),<i>"S"</i> (ct):<i>"si"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回比较结果。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>字符串<span lang=EN-US>1</span>与字符串<span
|
||
lang=EN-US>2</span>的前<span lang=EN-US>count</span>个字符进行比较。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>字符串<span lang=EN-US>1</span>，<span lang=EN-US>ct - </span>字符串<span
|
||
lang=EN-US>2</span>，<span lang=EN-US>count - </span>比较的字符数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - eax(__res)</span>返回值，<span
|
||
lang=EN-US>%1 - edi(cs)</span>串<span lang=EN-US>1</span>指针，<span lang=EN-US>%2
|
||
- esi(ct)</span>串<span lang=EN-US>2</span>指针，<span lang=EN-US>%3 - ecx(count)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：如果串<span
|
||
lang=EN-US>1 > </span>串<span lang=EN-US>2</span>，则返回<span lang=EN-US>1</span>；串<span
|
||
lang=EN-US>1 = </span>串<span lang=EN-US>2</span>，则返回<span lang=EN-US>0</span>；串<span
|
||
lang=EN-US>1 < </span>串<span lang=EN-US>2</span>，则返回<span lang=EN-US>-1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
|
||
lang=EN-US> extern inline int <u><span style='color:blue'>strncmp</span></u>(const
|
||
char * cs,const char * ct,int <u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US> register int __res __asm__(<i>"ax"</i>);
|
||
// __res</span>是寄存器变量<span lang=EN-US>(eax)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US> <i>"1:\tdecl
|
||
%3\n\t"</i>
|
||
// count--</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US> <i>"js 2f\n\t"</i> // </span>如果<span lang=EN-US>count<0</span>，则向前跳转到标号<span
|
||
lang=EN-US>2</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US> <i>"lodsb\n\t"</i>
|
||
// </span>取串<span lang=EN-US>2</span>的字符<span lang=EN-US>ds:[esi]</span><span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al</span>与串<span lang=EN-US>1</span>的字符<span
|
||
lang=EN-US>es:[edi]</span>，并且<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US> <i>"jne 3f\n\t"</i> // </span>如果不相等，则向前跳转到标号<span lang=EN-US>3</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US> <i>"testb %%al,%%al\n\t"</i>
|
||
// </span>该字符是<span lang=EN-US>NULL</span>字符吗？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
1b\n"</i>
|
||
// </span>不是，则向后跳转到标号<span lang=EN-US>1</span>，继续比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US> <i>"2:\txorl
|
||
%%eax,%%eax\n\t"</i> // </span>是<span lang=EN-US>NULL</span>字符，则<span
|
||
lang=EN-US>eax</span>清零（返回值）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US> <i>"jmp 4f\n"</i> // </span>向前跳转到标号<span lang=EN-US>4</span>，结束。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US> <i>"3:\tmovl
|
||
$1,%%eax\n\t"</i> // eax</span>中置<span
|
||
lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US> <i>"jl 4f\n\t"</i> // </span>如果前面比较中串<span lang=EN-US>2</span>字符<span
|
||
lang=EN-US><</span>串<span lang=EN-US>1</span>字符，则返回<span lang=EN-US>1</span>结束。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US> <i>"negl
|
||
%%eax\n"</i>
|
||
// </span>否则<span lang=EN-US>eax = -eax</span>，返回负值，结束。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US> <i>"4:"</i></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US> :<i>"=a"</i>
|
||
(__res):<i>"D"</i> (cs),<i>"S"</i> (ct),<i>"c"</i>
|
||
(<u><span style='color:blue'>count</span></u>):<i>"si"</i>,<i>"di"</i>,<i>"cx"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回比较结果。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>在字符串中寻找第一个匹配的字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>s
|
||
- </span>字符串，<span lang=EN-US>c - </span>欲寻找的字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - eax(__res)</span>，<span
|
||
lang=EN-US>%1 - esi(</span>字符串指针<span lang=EN-US>s)</span>，<span lang=EN-US>%2
|
||
- eax(</span>字符<span lang=EN-US>c)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：返回字符串中第一次出现匹配字符的指针。若没有找到匹配的字符，则返回空指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US> extern inline char * <u><span style='color:blue'>strchr</span></u>(const
|
||
char * s,char c)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US> register char * __res __asm__(<i>"ax"</i>); // __res</span>是寄存器变量<span
|
||
lang=EN-US>(eax)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US> <i>"movb
|
||
%%al,%%ah\n"</i>
|
||
// </span>将欲比较字符移到<span lang=EN-US>ah</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> <i>"1:\tlodsb\n\t"</i>
|
||
// </span>取字符串中字符<span lang=EN-US>ds:[esi]</span><span lang=EN-US
|
||
style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> <i>"cmpb
|
||
%%ah,%%al\n\t"</i> // </span>字符串中字符<span
|
||
lang=EN-US>al</span>与指定字符<span lang=EN-US>ah</span>相比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US> <i>"je 2f\n\t"</i> // </span>若相等，则向前跳转到标号<span lang=EN-US>2</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US> <i>"testb
|
||
%%al,%%al\n\t"</i> // al</span>中字符是<span
|
||
lang=EN-US>NULL</span>字符吗？（字符串结尾？）</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
1b\n\t"</i>
|
||
// </span>若不是，则向后跳转到标号<span lang=EN-US>1</span>，继续比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
$1,%1\n"</i>
|
||
// </span>是，则说明没有找到匹配字符，<span lang=EN-US>esi</span>置<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
|
||
lang=EN-US> <i>"2:\tmovl
|
||
%1,%0\n\t"</i> // </span>将指向匹配字符后一个字节处的指针值放入<span
|
||
lang=EN-US>eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%0"</i>
|
||
// </span>将指针调整为指向匹配的字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US> :<i>"=a"</i>
|
||
(__res):<i>"S"</i> (s),<i>"0"</i> (c):<i>"si"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>寻找字符串中指定字符最后一次出现的地方。（反向搜索字符串）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>s
|
||
- </span>字符串，<span lang=EN-US>c - </span>欲寻找的字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - edx(__res)</span>，<span
|
||
lang=EN-US>%1 - edx(0)</span>，<span lang=EN-US>%2 - esi(</span>字符串指针<span
|
||
lang=EN-US>s)</span>，<span lang=EN-US>%3 - eax(</span>字符<span lang=EN-US>c)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：返回字符串中最后一次出现匹配字符的指针。若没有找到匹配的字符，则返回空指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US> extern inline char * <u><span style='color:blue'>strrchr</span></u>(const
|
||
char * s,char c)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US> register char * __res __asm__(<i>"dx"</i>); // __res</span>是寄存器变量<span
|
||
lang=EN-US>(edx)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US> <i>"movb
|
||
%%al,%%ah\n"</i>
|
||
// </span>将欲寻找的字符移到<span lang=EN-US>ah</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US> <i>"1:\tlodsb\n\t"</i>
|
||
// </span>取字符串中字符<span lang=EN-US>ds:[esi]</span><span lang=EN-US
|
||
style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US> <i>"cmpb
|
||
%%ah,%%al\n\t"</i> // </span>字符串中字符<span
|
||
lang=EN-US>al</span>与指定字符<span lang=EN-US>ah</span>作比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US> <i>"jne 2f\n\t"</i> // </span>若不相等，则向前跳转到标号<span lang=EN-US>2</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%esi,%0\n\t"</i> //
|
||
</span>将字符指针保存到<span lang=EN-US>edx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%0\n"</i>
|
||
// </span>指针后退一位，指向字符串中匹配字符处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US> <i>"2:\ttestb
|
||
%%al,%%al\n\t"</i> // </span>比较的字符是<span lang=EN-US>0</span>吗（到字符串尾）？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
1b"</i>
|
||
// </span>不是则向后跳转到标号<span lang=EN-US>1</span>处，继续比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US> :<i>"=d"</i>
|
||
(__res):<i>"0"</i> (0),<i>"S"</i> (s),<i>"a"</i>
|
||
(c):<i>"ax"</i>,<i>"si"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>在字符串<span
|
||
lang=EN-US>1</span>中寻找第<span lang=EN-US>1</span>个字符序列，该字符序列中的任何字符都包含在字符串<span
|
||
lang=EN-US>2</span>中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>字符串<span lang=EN-US>1</span>指针，<span lang=EN-US>ct - </span>字符串<span
|
||
lang=EN-US>2</span>指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - esi(__res)</span>，<span
|
||
lang=EN-US>%1 - eax(0)</span>，<span lang=EN-US>%2 - ecx(-1)</span>，<span
|
||
lang=EN-US>%3 - esi(</span>串<span lang=EN-US>1</span>指针<span lang=EN-US>cs)</span>，<span
|
||
lang=EN-US>%4 - (</span>串<span lang=EN-US>2</span>指针<span lang=EN-US>ct)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回字符串<span lang=EN-US>1</span>中包含字符串<span
|
||
lang=EN-US>2</span>中任何字符的首个字符序列的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US> extern inline int <u><span style='color:blue'>strspn</span></u>(const
|
||
char * cs, const char * ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US> register char * __res __asm__(<i>"si"</i>); // __res</span>是寄存器变量<span
|
||
lang=EN-US>(esi)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
</span>首先计算串<span lang=EN-US>2</span>的长度。串<span lang=EN-US>2</span>指针放入<span
|
||
lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al(0)</span>与串<span lang=EN-US>2</span>中的字符（<span
|
||
lang=EN-US>es:[edi]</span>），并<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>如果不相等就继续比较<span lang=EN-US>(ecx</span>逐步递减<span lang=EN-US>)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US> <i>"notl
|
||
%%ecx\n\t"</i>
|
||
// ecx</span>中每位取反。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%%ecx\n\t"</i>
|
||
// ecx--</span>，得串<span lang=EN-US>2</span>的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%ecx,%%edx\n"</i> // </span>将串<span
|
||
lang=EN-US>2</span>的长度值暂放入<span lang=EN-US>edx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US> <i>"1:\tlodsb\n\t"</i>
|
||
// </span>取串<span lang=EN-US>1</span>字符<span lang=EN-US>ds:[esi]</span><span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US> <i>"testb
|
||
%%al,%%al\n\t"</i> // </span>该字符等于<span
|
||
lang=EN-US>0</span>值吗（串<span lang=EN-US>1</span>结尾）？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US> <i>"je 2f\n\t"</i> // </span>如果是，则向前跳转到标号<span lang=EN-US>2</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
|
||
lang=EN-US> <i>"movl %4,%%edi\n\t"</i>
|
||
// </span>取串<span lang=EN-US>2</span>头指针放入<span lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%edx,%%ecx\n\t"</i> // </span>再将串<span
|
||
lang=EN-US>2</span>的长度值放入<span lang=EN-US>ecx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al</span>与串<span lang=EN-US>2</span>中字符<span
|
||
lang=EN-US>es:[edi]</span>，并且<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>如果不相等就继续比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US> <i>"je
|
||
1b\n"</i>
|
||
// </span>如果相等，则向后跳转到标号<span lang=EN-US>1</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
|
||
lang=EN-US> <i>"2:\tdecl
|
||
%0"</i>
|
||
// esi--</span>，指向最后一个包含在串<span lang=EN-US>2</span>中的字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US> :<i>"=S"</i>
|
||
(__res):<i>"a"</i> (0),<i>"c"</i> (0xffffffff),<i>"0"</i>
|
||
(cs),<i>"g"</i> (ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US> :<i>"ax"</i>,<i>"cx"</i>,<i>"dx"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
|
||
lang=EN-US> return __res-cs;
|
||
// </span>返回字符序列的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>寻找字符串<span
|
||
lang=EN-US>1</span>中不包含字符串<span lang=EN-US>2</span>中任何字符的首个字符序列。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>字符串<span lang=EN-US>1</span>指针，<span lang=EN-US>ct - </span>字符串<span
|
||
lang=EN-US>2</span>指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - esi(__res)</span>，<span
|
||
lang=EN-US>%1 - eax(0)</span>，<span lang=EN-US>%2 - ecx(-1)</span>，<span
|
||
lang=EN-US>%3 - esi(</span>串<span lang=EN-US>1</span>指针<span lang=EN-US>cs)</span>，<span
|
||
lang=EN-US>%4 - (</span>串<span lang=EN-US>2</span>指针<span lang=EN-US>ct)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回字符串<span lang=EN-US>1</span>中不包含字符串<span
|
||
lang=EN-US>2</span>中任何字符的首个字符序列的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US> extern inline int <u><span style='color:blue'>strcspn</span></u>(const
|
||
char * cs, const char * ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US> register char * __res __asm__(<i>"si"</i>); // __res</span>是寄存器变量<span
|
||
lang=EN-US>(esi)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
</span>首先计算串<span lang=EN-US>2</span>的长度。串<span lang=EN-US>2</span>指针放入<span
|
||
lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
//
|
||
</span>比较<span lang=EN-US>al(0)</span>与串<span lang=EN-US>2</span>中的字符（<span
|
||
lang=EN-US>es:[edi]</span>），并<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>如果不相等就继续比较<span lang=EN-US>(ecx</span>逐步递减<span lang=EN-US>)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
|
||
lang=EN-US> <i>"notl
|
||
%%ecx\n\t"</i>
|
||
// ecx</span>中每位取反。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%%ecx\n\t"</i>
|
||
// ecx--</span>，得串<span lang=EN-US>2</span>的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US> <i>"movl %%ecx,%%edx\n"</i>
|
||
// </span>将串<span lang=EN-US>2</span>的长度值暂放入<span lang=EN-US>edx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
|
||
lang=EN-US> <i>"1:\tlodsb\n\t"</i>
|
||
// </span>取串<span lang=EN-US>1</span>字符<span lang=EN-US>ds:[esi]</span><span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
|
||
lang=EN-US> <i>"testb
|
||
%%al,%%al\n\t"</i> // </span>该字符等于<span
|
||
lang=EN-US>0</span>值吗（串<span lang=EN-US>1</span>结尾）？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
|
||
lang=EN-US> <i>"je 2f\n\t"</i> // </span>如果是，则向前跳转到标号<span lang=EN-US>2</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
</span>取串<span lang=EN-US>2</span>头指针放入<span lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%edx,%%ecx\n\t"</i> // </span>再将串<span
|
||
lang=EN-US>2</span>的长度值放入<span lang=EN-US>ecx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al</span>与串<span lang=EN-US>2</span>中字符<span
|
||
lang=EN-US>es:[edi]</span>，并且<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>如果不相等就继续比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
1b\n"</i>
|
||
// </span>如果不相等，则向后跳转到标号<span
|
||
lang=EN-US>1</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US> <i>"2:\tdecl
|
||
%0"</i>
|
||
// esi--</span>，指向最后一个包含在串<span lang=EN-US>2</span>中的字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US> :<i>"=S"</i>
|
||
(__res):<i>"a"</i> (0),<i>"c"</i> (0xffffffff),<i>"0"</i>
|
||
(cs),<i>"g"</i> (ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US> :<i>"ax"</i>,<i>"cx"</i>,<i>"dx"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US> return __res-cs;
|
||
// </span>返回字符序列的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>在字符串<span
|
||
lang=EN-US>1</span>中寻找首个包含在字符串<span lang=EN-US>2</span>中的任何字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>字符串<span lang=EN-US>1</span>的指针，<span lang=EN-US>ct - </span>字符串<span
|
||
lang=EN-US>2</span>的指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 -esi(__res)</span>，<span
|
||
lang=EN-US>%1 -eax(0)</span>，<span lang=EN-US>%2 -ecx(0xffffffff)</span>，<span
|
||
lang=EN-US>%3 -esi(</span>串<span lang=EN-US>1</span>指针<span lang=EN-US>cs)</span>，<span
|
||
lang=EN-US>%4 -(</span>串<span lang=EN-US>2</span>指针<span lang=EN-US>ct)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回字符串<span lang=EN-US>1</span>中首个包含字符串<span
|
||
lang=EN-US>2</span>中字符的指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US> extern inline char * <u><span style='color:blue'>strpbrk</span></u>(const
|
||
char * cs,const char * ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US> register char * __res __asm__(<i>"si"</i>); // __res</span>是寄存器变量<span
|
||
lang=EN-US>(esi)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>213</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
</span>首先计算串<span lang=EN-US>2</span>的长度。串<span lang=EN-US>2</span>指针放入<span
|
||
lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al(0)</span>与串<span lang=EN-US>2</span>中的字符（<span
|
||
lang=EN-US>es:[edi]</span>），并<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>如果不相等就继续比较<span lang=EN-US>(ecx</span>逐步递减<span lang=EN-US>)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
|
||
lang=EN-US> <i>"notl
|
||
%%ecx\n\t"</i>
|
||
// ecx</span>中每位取反。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%%ecx\n\t"</i>
|
||
// ecx--</span>，得串<span lang=EN-US>2</span>的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%ecx,%%edx\n"</i> // </span>将串<span
|
||
lang=EN-US>2</span>的长度值暂放入<span lang=EN-US>edx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
|
||
lang=EN-US> <i>"1:\tlodsb\n\t"</i>
|
||
// </span>取串<span lang=EN-US>1</span>字符<span lang=EN-US>ds:[esi]</span><span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
|
||
lang=EN-US> <i>"testb
|
||
%%al,%%al\n\t"</i> // </span>该字符等于<span
|
||
lang=EN-US>0</span>值吗（串<span lang=EN-US>1</span>结尾）？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
|
||
lang=EN-US> <i>"je 2f\n\t"</i> // </span>如果是，则向前跳转到标号<span lang=EN-US>2</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
</span>取串<span lang=EN-US>2</span>头指针放入<span lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%edx,%%ecx\n\t"</i> // </span>再将串<span
|
||
lang=EN-US>2</span>的长度值放入<span lang=EN-US>ecx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al</span>与串<span lang=EN-US>2</span>中字符<span
|
||
lang=EN-US>es:[edi]</span>，并且<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>如果不相等就继续比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
1b\n\t"</i>
|
||
// </span>如果不相等，则向后跳转到标号<span lang=EN-US>1</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
|
||
lang=EN-US> <i>"decl %0\n\t"</i>
|
||
// esi--</span>，指向一个包含在串<span lang=EN-US>2</span>中的字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US> <i>"jmp 3f\n"</i> // </span>向前跳转到标号<span lang=EN-US>3</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
|
||
lang=EN-US> <i>"2:\txorl
|
||
%0,%0\n"</i>
|
||
// </span>没有找到符合条件的，将返回值为<span lang=EN-US>NULL</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US> <i>"3:"</i></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US> :<i>"=S"</i>
|
||
(__res):<i>"a"</i> (0),<i>"c"</i> (0xffffffff),<i>"0"</i>
|
||
(cs),<i>"g"</i> (ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US> :<i>"ax"</i>,<i>"cx"</i>,<i>"dx"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回指针值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>在字符串<span
|
||
lang=EN-US>1</span>中寻找首个匹配整个字符串<span lang=EN-US>2</span>的字符串。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>字符串<span lang=EN-US>1</span>的指针，<span lang=EN-US>ct - </span>字符串<span
|
||
lang=EN-US>2</span>的指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 -eax(__res)</span>，<span
|
||
lang=EN-US>%1 -eax(0)</span>，<span lang=EN-US>%2 -ecx(0xffffffff)</span>，<span
|
||
lang=EN-US>%3 -esi(</span>串<span lang=EN-US>1</span>指针<span lang=EN-US>cs)</span>，<span
|
||
lang=EN-US>%4 -(</span>串<span lang=EN-US>2</span>指针<span lang=EN-US>ct)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：返回字符串<span
|
||
lang=EN-US>1</span>中首个匹配字符串<span lang=EN-US>2</span>的字符串指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>236</span></u><span
|
||
lang=EN-US> extern inline char * <u><span style='color:blue'>strstr</span></u>(const
|
||
char * cs,const char * ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>237</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
|
||
lang=EN-US> register char * __res __asm__(<i>"ax"</i>); // __res</span>是寄存器变量<span
|
||
lang=EN-US>(eax)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>239</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i> \
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>240</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
</span>首先计算串<span lang=EN-US>2</span>的长度。串<span lang=EN-US>2</span>指针放入<span
|
||
lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>比较<span lang=EN-US>al(0)</span>与串<span lang=EN-US>2</span>中的字符（<span
|
||
lang=EN-US>es:[edi]</span>），并<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>如果不相等就继续比较<span lang=EN-US>(ecx</span>逐步递减<span lang=EN-US>)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
|
||
lang=EN-US> <i>"notl
|
||
%%ecx\n\t"</i>
|
||
// ecx</span>中每位取反。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%%ecx\n\t"</i> <b><i>/* NOTE! This also sets Z if
|
||
searchstring='' */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>注意！如果搜索串为空，将设置<span lang=EN-US>Z</span>标志<span lang=EN-US> */ </span><span
|
||
lang=EN-US>// </span>得串<span lang=EN-US>2</span>的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%ecx,%%edx\n"</i> // </span>将串<span
|
||
lang=EN-US>2</span>的长度值暂放入<span lang=EN-US>edx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
|
||
lang=EN-US> <i>"1:\tmovl
|
||
%4,%%edi\n\t"</i> // </span>取串<span
|
||
lang=EN-US>2</span>头指针放入<span lang=EN-US>edi</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%esi,%%eax\n\t"</i> // </span>将串<span
|
||
lang=EN-US>1</span>的指针复制到<span lang=EN-US>eax</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%edx,%%ecx\n\t"</i> // </span>再将串<span
|
||
lang=EN-US>2</span>的长度值放入<span lang=EN-US>ecx</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>249</span></u><span
|
||
lang=EN-US> <i>"repe\n\t"</i>
|
||
// </span>比较串<span lang=EN-US>1</span>和串<span lang=EN-US>2</span>字符<span
|
||
lang=EN-US>(ds:[esi],es:[edi])</span>，<span lang=EN-US>esi++,edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>250</span></u><span
|
||
lang=EN-US> <i>"cmpsb\n\t"</i>
|
||
// </span>若对应字符相等就一直比较下去。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
|
||
lang=EN-US> <i>"je 2f\n\t"</i> <b><i>/* also works for empty string, see above */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>对空串同样有效，见上面<span lang=EN-US> */ // </span>若全相等，则转到标号<span lang=EN-US>2</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>252</span></u><span
|
||
lang=EN-US> <i>"xchgl
|
||
%%eax,%%esi\n\t"</i> // </span>串<span
|
||
lang=EN-US>1</span>头指针<span lang=EN-US style='font-family:Wingdings'>è</span><span
|
||
lang=EN-US>esi</span>，比较结果的串<span lang=EN-US>1</span>指针<span lang=EN-US
|
||
style='font-family:Wingdings'>è</span><span lang=EN-US>eax</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>253</span></u><span
|
||
lang=EN-US> <i>"incl
|
||
%%esi\n\t"</i>
|
||
// </span>串<span lang=EN-US>1</span>头指针指向下一个字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>254</span></u><span
|
||
lang=EN-US> <i>"cmpb
|
||
$0,-1(%%eax)\n\t"</i> // </span>串<span
|
||
lang=EN-US>1</span>指针<span lang=EN-US>(eax-1)</span>所指字节是<span lang=EN-US>0</span>吗？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>255</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
1b\n\t"</i>
|
||
// </span>不是则转到标号<span lang=EN-US>1</span>，继续从串<span lang=EN-US>1</span>的第<span
|
||
lang=EN-US>2</span>个字符开始比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>256</span></u><span
|
||
lang=EN-US> <i>"xorl
|
||
%%eax,%%eax\n\t"</i> // </span>清<span
|
||
lang=EN-US>eax</span>，表示没有找到匹配。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>257</span></u><span
|
||
lang=EN-US> <i>"2:"</i></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>258</span></u><span
|
||
lang=EN-US> :<i>"=a"</i>
|
||
(__res):<i>"0"</i> (0),<i>"c"</i> (0xffffffff),<i>"S"</i>
|
||
(cs),<i>"g"</i> (ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>259</span></u><span
|
||
lang=EN-US> :<i>"cx"</i>,<i>"dx"</i>,<i>"di"</i>,<i>"si"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>260</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回比较结果。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>261</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>262</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>计算字符串长度。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>s
|
||
- </span>字符串。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - ecx(__res)</span>，<span
|
||
lang=EN-US>%1 - edi(</span>字符串指针<span lang=EN-US>s)</span>，<span lang=EN-US>%2
|
||
- eax(0)</span>，<span lang=EN-US>%3 - ecx(0xffffffff)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：返回字符串的长度。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>263</span></u><span
|
||
lang=EN-US> extern inline int <u><span style='color:blue'>strlen</span></u>(const
|
||
char * s)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>264</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>265</span></u><span
|
||
lang=EN-US> register int __res __asm__(<i>"cx"</i>);
|
||
// __res</span>是寄存器变量<span lang=EN-US>(ecx)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>266</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>267</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// al(0)</span>与字符串中字符<span lang=EN-US>es:[edi]</span>比较，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>268</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>若不相等就一直比较。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>269</span></u><span
|
||
lang=EN-US> <i>"notl
|
||
%0\n\t"</i>
|
||
// ecx</span>取反。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>270</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%0"</i>
|
||
// ecx--</span>，得字符串得长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>271</span></u><span
|
||
lang=EN-US> :<i>"=c"</i>
|
||
(__res):<i>"D"</i> (s),<i>"a"</i> (0),<i>"0"</i>
|
||
(0xffffffff):<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>272</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回字符串长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>273</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>274</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>275</span></u><span
|
||
lang=EN-US> extern char * <u><span style='color:blue'>___strtok</span></u>;
|
||
// </span>用于临时存放指向下面被分析字符串<span lang=EN-US>1(s)</span>的指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>276</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>利用字符串<span
|
||
lang=EN-US>2</span>中的字符将字符串<span lang=EN-US>1</span>分割成标记<span lang=EN-US>(tokern)</span>序列。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>将串<span lang=EN-US>1</span>看作是包含零个或多个单词<span
|
||
lang=EN-US>(token)</span>的序列，并由分割符字符串<span lang=EN-US>2</span>中的一个或多个字符</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>分开。第一次调用 <span
|
||
lang=EN-US>strtok()</span>时，将返回指向字符串<span lang=EN-US>1</span>中第<span
|
||
lang=EN-US>1</span>个<span lang=EN-US>token</span>首字符的指针，并在返</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>回<span lang=EN-US>token</span>时将一
|
||
<span lang=EN-US>null</span>字符写到分割符处。后续使用 <span lang=EN-US>null </span>作为字符串<span
|
||
lang=EN-US>1</span>的调用，将用这种方</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>法继续扫描字符串<span
|
||
lang=EN-US>1</span>，直到没有<span lang=EN-US>token </span>为止。在不同的调用过程中，分割符串<span
|
||
lang=EN-US>2</span>可以不同。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>s
|
||
- </span>待处理的字符串<span lang=EN-US>1</span>，<span lang=EN-US>ct - </span>包含各个分割符的字符串<span
|
||
lang=EN-US>2</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>汇编输出：<span lang=EN-US>%0
|
||
- ebx(__res)</span>，<span lang=EN-US>%1 - esi(__strtok)</span>；</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>汇编输入：<span lang=EN-US>%2
|
||
- ebx(__strtok)</span>，<span lang=EN-US>%3 - esi(</span>字符串<span lang=EN-US>1</span>指针<span
|
||
lang=EN-US>s)</span>，<span lang=EN-US>%4 - (</span>字符串<span lang=EN-US>2</span>指针<span
|
||
lang=EN-US>ct)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：返回字符串<span
|
||
lang=EN-US>s</span>中第<span lang=EN-US>1</span>个<span lang=EN-US>token</span>，如果没有找到<span
|
||
lang=EN-US>token</span>，则返回一个<span lang=EN-US>null</span>指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>后续使用字符串<span
|
||
lang=EN-US>s</span>指针为<span lang=EN-US>null</span>的调用，将在原字符串<span lang=EN-US>s</span>中搜索下一个<span
|
||
lang=EN-US>token</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>277</span></u><span
|
||
lang=EN-US> extern inline char * <u><span style='color:blue'>strtok</span></u>(char
|
||
* s,const char * ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>278</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>279</span></u><span
|
||
lang=EN-US> register char * __res __asm__(<i>"si"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>280</span></u><span
|
||
lang=EN-US> __asm__(<i>"testl %1,%1\n\t"</i>
|
||
// </span>首先测试<span lang=EN-US>esi(</span>字符串<span
|
||
lang=EN-US>1</span>指针<span lang=EN-US>s)</span>是否是<span lang=EN-US>NULL</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>281</span></u><span
|
||
lang=EN-US> <i>"jne 1f\n\t"</i> // </span>如果不是，则表明是首次调用本函数，跳转标号<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>282</span></u><span
|
||
lang=EN-US> <i>"testl
|
||
%0,%0\n\t"</i>
|
||
// </span>若是<span lang=EN-US>NULL</span>，表示此次是后续调用，测<span lang=EN-US>ebx(__strtok)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>283</span></u><span
|
||
lang=EN-US> <i>"je 8f\n\t"</i> // </span>如果<span lang=EN-US>ebx</span>指针是<span
|
||
lang=EN-US>NULL</span>，则不能处理，跳转结束。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>284</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%0,%1\n"</i>
|
||
// </span>将<span lang=EN-US>ebx</span>指针复制到<span lang=EN-US>esi</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>285</span></u><span
|
||
lang=EN-US> <i>"1:\txorl
|
||
%0,%0\n\t"</i> // </span>清<span
|
||
lang=EN-US>ebx</span>指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>286</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
$-1,%%ecx\n\t"</i> // </span>置<span
|
||
lang=EN-US>ecx = 0xffffffff</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>287</span></u><span
|
||
lang=EN-US> <i>"xorl
|
||
%%eax,%%eax\n\t"</i> // </span>清零<span
|
||
lang=EN-US>eax</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>288</span></u><span
|
||
lang=EN-US> <i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>289</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
</span>下面求字符串<span lang=EN-US>2</span>的长度。<span lang=EN-US>edi</span>指向字符串<span
|
||
lang=EN-US>2</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>290</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>将<span lang=EN-US>al(0)</span>与<span lang=EN-US>es:[edi]</span>比较，并且<span
|
||
lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>291</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>直到找到字符串<span lang=EN-US>2</span>的结束<span lang=EN-US>null</span>字符，或计数<span
|
||
lang=EN-US>ecx==0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>292</span></u><span
|
||
lang=EN-US> <i>"notl
|
||
%%ecx\n\t"</i>
|
||
// </span>将<span lang=EN-US>ecx</span>取反，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>293</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%%ecx\n\t"</i>
|
||
// ecx--</span>，得到字符串<span lang=EN-US>2</span>的长度值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>294</span></u><span
|
||
lang=EN-US> <i>"je 7f\n\t"</i> <b><i>/* empty delimeter-string */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>分割符字符串空<span lang=EN-US> */ // </span>若串<span lang=EN-US>2</span>长度为<span
|
||
lang=EN-US>0</span>，则转标号<span lang=EN-US>7</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>295</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%ecx,%%edx\n"</i> // </span>将串<span
|
||
lang=EN-US>2</span>长度暂存入<span lang=EN-US>edx</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>296</span></u><span
|
||
lang=EN-US> <i>"2:\tlodsb\n\t"</i>
|
||
// </span>取串<span lang=EN-US>1</span>的字符<span lang=EN-US>ds:[esi]</span><span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>297</span></u><span
|
||
lang=EN-US> <i>"testb
|
||
%%al,%%al\n\t"</i> // </span>该字符为<span
|
||
lang=EN-US>0</span>值吗<span lang=EN-US>(</span>串<span lang=EN-US>1</span>结束<span
|
||
lang=EN-US>)</span>？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>298</span></u><span
|
||
lang=EN-US> <i>"je 7f\n\t"</i> // </span>如果是，则跳转标号<span lang=EN-US>7</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>299</span></u><span
|
||
lang=EN-US> <i>"movl %4,%%edi\n\t"</i>
|
||
// edi</span>再次指向串<span lang=EN-US>2</span>首。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>300</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%edx,%%ecx\n\t"</i> // </span>取串<span
|
||
lang=EN-US>2</span>的长度值置入计数器<span lang=EN-US>ecx</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>301</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>将<span lang=EN-US>al</span>中串<span lang=EN-US>1</span>的字符与串<span
|
||
lang=EN-US>2</span>中所有字符比较，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>302</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>判断该字符是否为分割符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>303</span></u><span
|
||
lang=EN-US> <i>"je
|
||
2b\n\t"</i>
|
||
// </span>若能在串<span lang=EN-US>2</span>中找到相同字符（分割符），则跳转标号<span
|
||
lang=EN-US>2</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>304</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%1\n\t"</i>
|
||
// </span>若不是分割符，则串<span lang=EN-US>1</span>指针<span lang=EN-US>esi</span>指向此时的该字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>305</span></u><span
|
||
lang=EN-US> <i>"cmpb
|
||
$0,(%1)\n\t"</i>
|
||
// </span>该字符是<span lang=EN-US>NULL</span>字符吗？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>306</span></u><span
|
||
lang=EN-US> <i>"je 7f\n\t"</i> // </span>若是，则跳转标号<span lang=EN-US>7</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>307</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%1,%0\n"</i>
|
||
// </span>将该字符的指针<span lang=EN-US>esi</span>存放在<span lang=EN-US>ebx</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>308</span></u><span
|
||
lang=EN-US> <i>"3:\tlodsb\n\t"</i>
|
||
// </span>取串<span lang=EN-US>1</span>下一个字符<span lang=EN-US>ds:[esi]</span><span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>al</span>，并且<span
|
||
lang=EN-US>esi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>309</span></u><span
|
||
lang=EN-US> <i>"testb
|
||
%%al,%%al\n\t"</i> // </span>该字符是<span
|
||
lang=EN-US>NULL</span>字符吗？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>310</span></u><span
|
||
lang=EN-US> <i>"je 5f\n\t"</i> // </span>若是，表示串<span lang=EN-US>1</span>结束，跳转到标号<span
|
||
lang=EN-US>5</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>311</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%4,%%edi\n\t"</i> //
|
||
edi</span>再次指向串<span lang=EN-US>2</span>首。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>312</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%edx,%%ecx\n\t"</i> // </span>串<span
|
||
lang=EN-US>2</span>长度值置入计数器<span lang=EN-US>ecx</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>313</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>将<span lang=EN-US>al</span>中串<span lang=EN-US>1</span>的字符与串<span
|
||
lang=EN-US>2</span>中每个字符比较，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>314</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// </span>测试<span lang=EN-US>al</span>字符是否是分割符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>315</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
3b\n\t"</i>
|
||
// </span>若不是分割符则跳转标号<span lang=EN-US>3</span>，检测串<span lang=EN-US>1</span>中下一个字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>316</span></u><span
|
||
lang=EN-US> <i>"decl
|
||
%1\n\t"</i>
|
||
// </span>若是分割符，则<span lang=EN-US>esi--</span>，指向该分割符字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>317</span></u><span
|
||
lang=EN-US> <i>"cmpb
|
||
$0,(%1)\n\t"</i>
|
||
// </span>该分割符是<span lang=EN-US>NULL</span>字符吗？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>318</span></u><span
|
||
lang=EN-US> <i>"je 5f\n\t"</i> // </span>若是，则跳转到标号<span lang=EN-US>5</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>319</span></u><span
|
||
lang=EN-US> <i>"movb
|
||
$0,(%1)\n\t"</i>
|
||
// </span>若不是，则将该分割符用<span lang=EN-US>NULL</span>字符替换掉。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>320</span></u><span
|
||
lang=EN-US> <i>"incl
|
||
%1\n\t"</i>
|
||
// esi</span>指向串<span lang=EN-US>1</span>中下一个字符，也即剩余串首。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>321</span></u><span
|
||
lang=EN-US> <i>"jmp 6f\n"</i> // </span>跳转标号<span lang=EN-US>6</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>322</span></u><span
|
||
lang=EN-US> <i>"5:\txorl
|
||
%1,%1\n"</i>
|
||
// esi</span>清零。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>323</span></u><span
|
||
lang=EN-US> <i>"6:\tcmpb
|
||
$0,(%0)\n\t"</i> // ebx</span>指针指向<span
|
||
lang=EN-US>NULL</span>字符吗？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>324</span></u><span
|
||
lang=EN-US> <i>"jne 7f\n\t"</i> // </span>若不是，则跳转标号<span lang=EN-US>7</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>325</span></u><span
|
||
lang=EN-US> <i>"xorl
|
||
%0,%0\n"</i>
|
||
// </span>若是，则让<span lang=EN-US>ebx=NULL</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>326</span></u><span
|
||
lang=EN-US> <i>"7:\ttestl
|
||
%0,%0\n\t"</i> // ebx</span>指针为<span
|
||
lang=EN-US>NULL</span>吗？</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>327</span></u><span
|
||
lang=EN-US> <i>"jne 8f\n\t"</i> // </span>若不是则跳转<span lang=EN-US>8</span>，结束汇编代码。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>328</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%0,%1\n"</i> //
|
||
</span>将<span lang=EN-US>esi</span>置为<span lang=EN-US>NULL</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>329</span></u><span
|
||
lang=EN-US> <i>"8:"</i></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>330</span></u><span
|
||
lang=EN-US> :<i>"=b"</i>
|
||
(__res),<i>"=S"</i> (<u><span style='color:blue'>___strtok</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>331</span></u><span
|
||
lang=EN-US> :<i>"0"</i>
|
||
(<u><span style='color:blue'>___strtok</span></u>),<i>"1"</i> (s),<i>"g"</i>
|
||
(ct)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>332</span></u><span
|
||
lang=EN-US> :<i>"ax"</i>,<i>"cx"</i>,<i>"dx"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>333</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回指向新<span lang=EN-US>token</span>的指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>334</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>335</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>内存块复制。从源地址<span
|
||
lang=EN-US>src</span>处开始复制<span lang=EN-US>n</span>个字节到目的地址<span lang=EN-US>dest</span>处。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dest
|
||
- </span>复制的目的地址，<span lang=EN-US>src - </span>复制的源地址，<span lang=EN-US>n - </span>复制字节数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - ecx(n)</span>，<span
|
||
lang=EN-US>%1 - esi(src)</span>，<span lang=EN-US>%2 - edi(dest)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>336</span></u><span
|
||
lang=EN-US> extern inline void * <u><span style='color:blue'>memcpy</span></u>(void
|
||
* dest,const void * src, int n)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>337</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>338</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>339</span></u><span
|
||
lang=EN-US> <i>"rep\n\t"</i>
|
||
// </span>重复执行复制<span lang=EN-US>ecx</span>个字节，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>340</span></u><span
|
||
lang=EN-US> <i>"movsb"</i>
|
||
// </span>从<span lang=EN-US>ds:[esi]</span>到<span lang=EN-US>es:[edi]</span>，<span
|
||
lang=EN-US>esi++</span>，<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>341</span></u><span
|
||
lang=EN-US> ::<i>"c"</i>
|
||
(n),<i>"S"</i> (src),<i>"D"</i> (dest)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>342</span></u><span
|
||
lang=EN-US> :<i>"cx"</i>,<i>"si"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>343</span></u><span
|
||
lang=EN-US> return dest;
|
||
// </span>返回目的地址。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>344</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>345</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>内存块移动。同内存块复制，但考虑移动的方向。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>dest
|
||
- </span>复制的目的地址，<span lang=EN-US>src - </span>复制的源地址，<span lang=EN-US>n - </span>复制字节数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若<span lang=EN-US>dest<src</span>则：<span
|
||
lang=EN-US>%0 - ecx(n)</span>，<span lang=EN-US>%1 - esi(src)</span>，<span
|
||
lang=EN-US>%2 - edi(dest)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则：<span lang=EN-US>%0
|
||
- ecx(n)</span>，<span lang=EN-US>%1 - esi(src+n-1)</span>，<span lang=EN-US>%2 -
|
||
edi(dest+n-1)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这样操作是为了防止在复制时错误地重叠覆盖。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>346</span></u><span
|
||
lang=EN-US> extern inline void * <u><span style='color:blue'>memmove</span></u>(void
|
||
* dest,const void * src, int n)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>347</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>348</span></u><span
|
||
lang=EN-US> if (dest<src)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>349</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>350</span></u><span
|
||
lang=EN-US> <i>"rep\n\t"</i>
|
||
// </span>从<span lang=EN-US>ds:[esi]</span>到<span lang=EN-US>es:[edi]</span>，并且<span
|
||
lang=EN-US>esi++</span>，<span lang=EN-US>edi++</span>，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>351</span></u><span
|
||
lang=EN-US> <i>"movsb"</i>
|
||
// </span>重复执行复制<span lang=EN-US>ecx</span>字节。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>352</span></u><span
|
||
lang=EN-US> ::<i>"c"</i>
|
||
(n),<i>"S"</i> (src),<i>"D"</i> (dest)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>353</span></u><span
|
||
lang=EN-US> :<i>"cx"</i>,<i>"si"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>354</span></u><span
|
||
lang=EN-US> else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>355</span></u><span
|
||
lang=EN-US> __asm__(<i>"std\n\t"</i>
|
||
// </span>置方向位，从末端开始复制。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>356</span></u><span
|
||
lang=EN-US> <i>"rep\n\t"</i>
|
||
// </span>从<span lang=EN-US>ds:[esi]</span>到<span lang=EN-US>es:[edi]</span>，并且<span
|
||
lang=EN-US>esi--</span>，<span lang=EN-US>edi--</span>，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>357</span></u><span
|
||
lang=EN-US> <i>"movsb"</i>
|
||
// </span>复制<span lang=EN-US>ecx</span>个字节。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>358</span></u><span
|
||
lang=EN-US> ::<i>"c"</i>
|
||
(n),<i>"S"</i> (src+n-1),<i>"D"</i> (dest+n-1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>359</span></u><span
|
||
lang=EN-US> :<i>"cx"</i>,<i>"si"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>360</span></u><span
|
||
lang=EN-US> return dest;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>361</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>362</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>比较<span lang=EN-US>n</span>个字节的两块内存（两个字符串），即使遇上<span
|
||
lang=EN-US>NULL</span>字节也不停止比较。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>内存块<span lang=EN-US>1</span>地址，<span lang=EN-US>ct - </span>内存块<span
|
||
lang=EN-US>2</span>地址，<span lang=EN-US>count - </span>比较的字节数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - eax(__res)</span>，<span
|
||
lang=EN-US>%1 - eax(0)</span>，<span lang=EN-US>%2 - edi(</span>内存块<span
|
||
lang=EN-US>1)</span>，<span lang=EN-US>%3 - esi(</span>内存块<span lang=EN-US>2)</span>，<span
|
||
lang=EN-US>%4 - ecx(count)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：若块<span lang=EN-US>1></span>块<span
|
||
lang=EN-US>2 </span>返回<span lang=EN-US>1</span>；块<span lang=EN-US>1<</span>块<span
|
||
lang=EN-US>2</span>，返回<span lang=EN-US>-1</span>；块<span lang=EN-US>1==</span>块<span
|
||
lang=EN-US>2</span>，则返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>363</span></u><span
|
||
lang=EN-US> extern inline int <u><span style='color:blue'>memcmp</span></u>(const
|
||
void * cs,const void * ct,int <u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>364</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>365</span></u><span
|
||
lang=EN-US> register int __res __asm__(<i>"ax"</i>);
|
||
// __res</span>是寄存器变量。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>366</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>367</span></u><span
|
||
lang=EN-US> <i>"repe\n\t"</i>
|
||
// </span>如果相等则重复，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>368</span></u><span
|
||
lang=EN-US> <i>"cmpsb\n\t"</i>
|
||
// </span>比较<span lang=EN-US>ds:[esi]</span>与<span lang=EN-US>es:[edi]</span>的内容，并且<span
|
||
lang=EN-US>esi++</span>，<span lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>369</span></u><span
|
||
lang=EN-US> <i>"je 1f\n\t"</i> // </span>如果都相同，则跳转到标号<span lang=EN-US>1</span>，返回<span
|
||
lang=EN-US>0(eax)</span>值</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>370</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
$1,%%eax\n\t"</i> //
|
||
</span>否则<span lang=EN-US>eax</span>置<span lang=EN-US>1</span>，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>371</span></u><span
|
||
lang=EN-US> <i>"jl 1f\n\t"</i> // </span>若内存块<span lang=EN-US>2</span>内容的值<span
|
||
lang=EN-US><</span>内存块<span lang=EN-US>1</span>，则跳转标号<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>372</span></u><span
|
||
lang=EN-US> <i>"negl
|
||
%%eax\n"</i>
|
||
// </span>否则<span lang=EN-US>eax = -eax</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>373</span></u><span
|
||
lang=EN-US> <i>"1:"</i></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>374</span></u><span
|
||
lang=EN-US> :<i>"=a"</i>
|
||
(__res):<i>"0"</i> (0),<i>"D"</i> (cs),<i>"S"</i>
|
||
(ct),<i>"c"</i> (<u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>375</span></u><span
|
||
lang=EN-US> :<i>"si"</i>,<i>"di"</i>,<i>"cx"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>376</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回比较结果。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>377</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>378</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>在<span lang=EN-US>n</span>字节大小的内存块<span
|
||
lang=EN-US>(</span>字符串<span lang=EN-US>)</span>中寻找指定字符。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>cs
|
||
- </span>指定内存块地址，<span lang=EN-US>c - </span>指定的字符，<span lang=EN-US>count - </span>内存块长度。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - edi(__res)</span>，<span
|
||
lang=EN-US>%1 - eax(</span>字符<span lang=EN-US>c)</span>，<span lang=EN-US>%2 - edi(</span>内存块地址<span
|
||
lang=EN-US>cs)</span>，<span lang=EN-US>%3 - ecx(</span>字节数<span lang=EN-US>count)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回第一个匹配字符的指针，如果没有找到，则返回<span
|
||
lang=EN-US>NULL</span>字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>379</span></u><span
|
||
lang=EN-US> extern inline void * <u><span style='color:blue'>memchr</span></u>(const
|
||
void * cs,char c,int <u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>380</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>381</span></u><span
|
||
lang=EN-US> register void * __res __asm__(<i>"di"</i>); // __res</span>是寄存器变量。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>382</span></u><span
|
||
lang=EN-US> if (!<u><span style='color:blue'>count</span></u>)
|
||
// </span>如果内存块长度<span lang=EN-US>==0</span>，则返回<span lang=EN-US>NULL</span>，没有找到。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>383</span></u><span
|
||
lang=EN-US> return <u><span
|
||
style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>384</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>385</span></u><span
|
||
lang=EN-US> <i>"repne\n\t"</i>
|
||
// </span>如果不相等则重复执行下面语句，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>386</span></u><span
|
||
lang=EN-US> <i>"scasb\n\t"</i>
|
||
// al</span>中字符与<span lang=EN-US>es:[edi]</span>字符作比较，并且<span lang=EN-US>edi++</span>，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>387</span></u><span
|
||
lang=EN-US> <i>"je 1f\n\t"</i> // </span>如果相等则向前跳转到标号<span lang=EN-US>1</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>388</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
$1,%0\n"</i>
|
||
// </span>否则<span lang=EN-US>edi</span>中置<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>389</span></u><span
|
||
lang=EN-US> <i>"1:\tdecl
|
||
%0"</i>
|
||
// </span>让<span lang=EN-US>edi</span>指向找到的字符（或是<span lang=EN-US>NULL</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>390</span></u><span
|
||
lang=EN-US> :<i>"=D"</i>
|
||
(__res):<i>"a"</i> (c),<i>"D"</i> (cs),<i>"c"</i>
|
||
(<u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>391</span></u><span
|
||
lang=EN-US> :<i>"cx"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>392</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回字符指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>393</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>394</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>用字符填写指定长度内存块。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用字符<span lang=EN-US>c</span>填写<span
|
||
lang=EN-US>s</span>指向的内存区域，共填<span lang=EN-US>count</span>字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> // %0 - eax(</span>字符<span
|
||
lang=EN-US>c)</span>，<span lang=EN-US>%1 - edi(</span>内存地址<span lang=EN-US>)</span>，<span
|
||
lang=EN-US>%2 - ecx(</span>字节数<span lang=EN-US>count)</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>395</span></u><span
|
||
lang=EN-US> extern inline void * <u><span style='color:blue'>memset</span></u>(void
|
||
* s,char c,int <u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>396</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>397</span></u><span
|
||
lang=EN-US> __asm__(<i>"cld\n\t"</i>
|
||
// </span>清方向位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>398</span></u><span
|
||
lang=EN-US> <i>"rep\n\t"</i>
|
||
// </span>重复<span
|
||
lang=EN-US>ecx</span>指定的次数，执行</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>399</span></u><span
|
||
lang=EN-US> <i>"stosb"</i>
|
||
// </span>将<span lang=EN-US>al</span>中字符存入<span lang=EN-US>es:[edi]</span>中，并且<span
|
||
lang=EN-US>edi++</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>400</span></u><span
|
||
lang=EN-US> ::<i>"a"</i>
|
||
(c),<i>"D"</i> (s),<i>"c"</i> (<u><span style='color:blue'>count</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>401</span></u><span
|
||
lang=EN-US> :<i>"cx"</i>,<i>"di"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>402</span></u><span
|
||
lang=EN-US> return s;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>403</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>404</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>405</span></u><span
|
||
lang=EN-US> #endif</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>406</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|