📄 mktime.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/mktime.c</title><meta http-equiv=Content-Type content="text/html; charset=gb2312"><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/kernel/mktime.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>]</div><h1 align=center> <a href="http:/"> OldLinux</a> <a href="http:blurb.html"> 交叉引用</a><br> <a href="source/">Linux</a>/<a href="source/kernel/">kernel</a>/<a href="source/kernel/mktime.c">mktime.c</a></h1><div align=center> <b>版本:</b> [<a href="source/kernel/mktime.c?v=1.0">1.0</a>] [<a href="source/kernel/mktime.c?v=0.99.11">0.99.11</a>] [<a href="source/kernel/mktime.c?v=0.99">0.99</a>] [<a href="source/kernel/mktime.c?v=0.97">0.97</a>] [<a href="source/kernel/mktime.c?v=0.96a">0.96a</a>] [<a href="source/kernel/mktime.c?v=0.95">0.95</a>] [<a href="source/kernel/mktime.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/kernel/mktime.c?v=0.01">0.01</a>] <br> <b>体系结构:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/kernel/mktime.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/kernel/mktime.c#L2">2</a> <b><i> * linux/kernel/mktime.c</i></b> <a name=L3 href="source/kernel/mktime.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/kernel/mktime.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/kernel/mktime.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/kernel/mktime.c#L6">6</a> <a name=L7 href="source/kernel/mktime.c#L7">7</a> #include <time.h> <a name=L8 href="source/kernel/mktime.c#L8">8</a> <a name=L9 href="source/kernel/mktime.c#L9">9</a> <b><i>/*</i></b> <a name=L10 href="source/kernel/mktime.c#L10">10</a> <b><i> * This isn't the library routine, it is only used in the kernel.</i></b> <a name=L11 href="source/kernel/mktime.c#L11">11</a> <b><i> * as such, we don't care about years<1970 etc, but assume everything</i></b> <a name=L12 href="source/kernel/mktime.c#L12">12</a> <b><i> * is ok. Similarly, TZ etc is happily ignored. We just do everything</i></b> <a name=L13 href="source/kernel/mktime.c#L13">13</a> <b><i> * as easily as possible. Let's find something public for the library</i></b> <a name=L14 href="source/kernel/mktime.c#L14">14</a> <b><i> * routines (although I think minix times is public).</i></b> <a name=L15 href="source/kernel/mktime.c#L15">15</a> <b><i> */</i></b> <a name=L16 href="source/kernel/mktime.c#L16">16</a> <b><i>/*</i></b> <a name=L17 href="source/kernel/mktime.c#L17">17</a> <b><i> * PS. I hate whoever though up the year 1970 - couldn't they have gotten</i></b> <a name=L18 href="source/kernel/mktime.c#L18">18</a> <b><i> * a leap-year instead? I also hate Gregorius, pope or no. I'm grumpy.</i></b> <a name=L19 href="source/kernel/mktime.c#L19">19</a> <b><i> */</i></b> <a name=L20 href="source/kernel/mktime.c#L20">20</a> #define <a href="ident?i=MINUTE">MINUTE</a> 60 <a name=L21 href="source/kernel/mktime.c#L21">21</a> #define <a href="ident?i=HOUR">HOUR</a> (60*<a href="ident?i=MINUTE">MINUTE</a>) <a name=L22 href="source/kernel/mktime.c#L22">22</a> #define <a href="ident?i=DAY">DAY</a> (24*<a href="ident?i=HOUR">HOUR</a>) <a name=L23 href="source/kernel/mktime.c#L23">23</a> #define <a href="ident?i=YEAR">YEAR</a> (365*<a href="ident?i=DAY">DAY</a>) <a name=L24 href="source/kernel/mktime.c#L24">24</a> <a name=L25 href="source/kernel/mktime.c#L25">25</a> <b><i>/* interestingly, we assume leap-years */</i></b> <a name=L26 href="source/kernel/mktime.c#L26">26</a> static int <a href="ident?i=month">month</a>[12] = { <a name=L27 href="source/kernel/mktime.c#L27">27</a> 0, <a name=L28 href="source/kernel/mktime.c#L28">28</a> <a href="ident?i=DAY">DAY</a>*(31), <a name=L29 href="source/kernel/mktime.c#L29">29</a> <a href="ident?i=DAY">DAY</a>*(31+29), <a name=L30 href="source/kernel/mktime.c#L30">30</a> <a href="ident?i=DAY">DAY</a>*(31+29+31), <a name=L31 href="source/kernel/mktime.c#L31">31</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30), <a name=L32 href="source/kernel/mktime.c#L32">32</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30+31), <a name=L33 href="source/kernel/mktime.c#L33">33</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30+31+30), <a name=L34 href="source/kernel/mktime.c#L34">34</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30+31+30+31), <a name=L35 href="source/kernel/mktime.c#L35">35</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30+31+30+31+31), <a name=L36 href="source/kernel/mktime.c#L36">36</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30+31+30+31+31+30), <a name=L37 href="source/kernel/mktime.c#L37">37</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30+31+30+31+31+30+31), <a name=L38 href="source/kernel/mktime.c#L38">38</a> <a href="ident?i=DAY">DAY</a>*(31+29+31+30+31+30+31+31+30+31+30) <a name=L39 href="source/kernel/mktime.c#L39">39</a> }; <a name=L40 href="source/kernel/mktime.c#L40">40</a> <a name=L41 href="source/kernel/mktime.c#L41">41</a> long <a href="ident?i=kernel_mktime">kernel_mktime</a>(struct <a href="ident?i=tm">tm</a> * <a href="ident?i=tm">tm</a>) <a name=L42 href="source/kernel/mktime.c#L42">42</a> { <a name=L43 href="source/kernel/mktime.c#L43">43</a> long res; <a name=L44 href="source/kernel/mktime.c#L44">44</a> int year; <a name=L45 href="source/kernel/mktime.c#L45">45</a> <a name=L46 href="source/kernel/mktime.c#L46">46</a> year = <a href="ident?i=tm">tm</a>->tm_year - 70; <a name=L47 href="source/kernel/mktime.c#L47">47</a> <b><i>/* magic offsets (y+1) needed to get leapyears right.*/</i></b> <a name=L48 href="source/kernel/mktime.c#L48">48</a> res = <a href="ident?i=YEAR">YEAR</a>*year + <a href="ident?i=DAY">DAY</a>*((year+1)/4); <a name=L49 href="source/kernel/mktime.c#L49">49</a> res += <a href="ident?i=month">month</a>[<a href="ident?i=tm">tm</a>->tm_mon]; <a name=L50 href="source/kernel/mktime.c#L50">50</a> <b><i>/* and (y+2) here. If it wasn't a leap-year, we have to adjust */</i></b> <a name=L51 href="source/kernel/mktime.c#L51">51</a> if (<a href="ident?i=tm">tm</a>->tm_mon>1 && ((year+2)%4)) <a name=L52 href="source/kernel/mktime.c#L52">52</a> res -= <a href="ident?i=DAY">DAY</a>; <a name=L53 href="source/kernel/mktime.c#L53">53</a> res += <a href="ident?i=DAY">DAY</a>*(<a href="ident?i=tm">tm</a>->tm_mday-1); <a name=L54 href="source/kernel/mktime.c#L54">54</a> res += <a href="ident?i=HOUR">HOUR</a>*<a href="ident?i=tm">tm</a>->tm_hour; <a name=L55 href="source/kernel/mktime.c#L55">55</a> res += <a href="ident?i=MINUTE">MINUTE</a>*<a href="ident?i=tm">tm</a>->tm_min; <a name=L56 href="source/kernel/mktime.c#L56">56</a> res += <a href="ident?i=tm">tm</a>->tm_sec; <a name=L57 href="source/kernel/mktime.c#L57">57</a> return res; <a name=L58 href="source/kernel/mktime.c#L58">58</a> } <a name=L59 href="source/kernel/mktime.c#L59">59</a> </pre><hr><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/kernel/mktime.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>] </div><hr>本网页由 <a href="http:blurb.html">LXR引擎</a> 自动生成.<br></html>⌨️ 快捷键说明
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