📄 vsprintf.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/kernel/vsprintf.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/vsprintf.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/vsprintf.c">vsprintf.c</a></h1><div align=center> <b>版本:</b> [<a href="source/kernel/vsprintf.c?v=1.0">1.0</a>] [<a href="source/kernel/vsprintf.c?v=0.99.11">0.99.11</a>] [<a href="source/kernel/vsprintf.c?v=0.99">0.99</a>] [<a href="source/kernel/vsprintf.c?v=0.97">0.97</a>] [<a href="source/kernel/vsprintf.c?v=0.96a">0.96a</a>] [<a href="source/kernel/vsprintf.c?v=0.95">0.95</a>] [<a href="source/kernel/vsprintf.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/kernel/vsprintf.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/vsprintf.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/kernel/vsprintf.c#L2">2</a> <b><i> * linux/kernel/vsprintf.c</i></b> <a name=L3 href="source/kernel/vsprintf.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/kernel/vsprintf.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/kernel/vsprintf.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/kernel/vsprintf.c#L6">6</a> <a name=L7 href="source/kernel/vsprintf.c#L7">7</a> <b><i>/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */</i></b> <a name=L8 href="source/kernel/vsprintf.c#L8">8</a> <b><i>/*</i></b> <a name=L9 href="source/kernel/vsprintf.c#L9">9</a> <b><i> * Wirzenius wrote this portably, Torvalds fucked it up :-)</i></b> <a name=L10 href="source/kernel/vsprintf.c#L10">10</a> <b><i> */</i></b> <a name=L11 href="source/kernel/vsprintf.c#L11">11</a> <a name=L12 href="source/kernel/vsprintf.c#L12">12</a> #include <stdarg.h> <a name=L13 href="source/kernel/vsprintf.c#L13">13</a> #include <string.h> <a name=L14 href="source/kernel/vsprintf.c#L14">14</a> <a name=L15 href="source/kernel/vsprintf.c#L15">15</a> <b><i>/* we use this so that we can do without the ctype library */</i></b> <a name=L16 href="source/kernel/vsprintf.c#L16">16</a> #define <a href="ident?i=is_digit">is_digit</a>(c) ((c) >= <i>''</i> && (c) <= <i>'9'</i>) <a name=L17 href="source/kernel/vsprintf.c#L17">17</a> <a name=L18 href="source/kernel/vsprintf.c#L18">18</a> static int <a href="ident?i=skip_atoi">skip_atoi</a>(const char **s) <a name=L19 href="source/kernel/vsprintf.c#L19">19</a> { <a name=L20 href="source/kernel/vsprintf.c#L20">20</a> int i=0; <a name=L21 href="source/kernel/vsprintf.c#L21">21</a> <a name=L22 href="source/kernel/vsprintf.c#L22">22</a> while (<a href="ident?i=is_digit">is_digit</a>(**s)) <a name=L23 href="source/kernel/vsprintf.c#L23">23</a> i = i*10 + *((*s)++) - <i>''</i>; <a name=L24 href="source/kernel/vsprintf.c#L24">24</a> return i; <a name=L25 href="source/kernel/vsprintf.c#L25">25</a> } <a name=L26 href="source/kernel/vsprintf.c#L26">26</a> <a name=L27 href="source/kernel/vsprintf.c#L27">27</a> #define <a href="ident?i=ZEROPAD">ZEROPAD</a> 1 <b><i>/* pad with zero */</i></b> <a name=L28 href="source/kernel/vsprintf.c#L28">28</a> #define <a href="ident?i=SIGN">SIGN</a> 2 <b><i>/* unsigned/signed long */</i></b> <a name=L29 href="source/kernel/vsprintf.c#L29">29</a> #define <a href="ident?i=PLUS">PLUS</a> 4 <b><i>/* show plus */</i></b> <a name=L30 href="source/kernel/vsprintf.c#L30">30</a> #define <a href="ident?i=SPACE">SPACE</a> 8 <b><i>/* space if plus */</i></b> <a name=L31 href="source/kernel/vsprintf.c#L31">31</a> #define <a href="ident?i=LEFT">LEFT</a> 16 <b><i>/* left justified */</i></b> <a name=L32 href="source/kernel/vsprintf.c#L32">32</a> #define <a href="ident?i=SPECIAL">SPECIAL</a> 32 <b><i>/* 0x */</i></b> <a name=L33 href="source/kernel/vsprintf.c#L33">33</a> #define <a href="ident?i=SMALL">SMALL</a> 64 <b><i>/* use 'abcdef' instead of 'ABCDEF' */</i></b> <a name=L34 href="source/kernel/vsprintf.c#L34">34</a> <a name=L35 href="source/kernel/vsprintf.c#L35">35</a> #define <a href="ident?i=do_div">do_div</a>(n,base) ({ \ <a name=L36 href="source/kernel/vsprintf.c#L36">36</a> int __res; \ <a name=L37 href="source/kernel/vsprintf.c#L37">37</a> __asm__(<i>"divl %4"</i>:<i>"=a"</i> (n),<i>"=d"</i> (__res):<i>""</i> (n),<i>"1"</i> (0),<i>"r"</i> (base)); \ <a name=L38 href="source/kernel/vsprintf.c#L38">38</a> __res; }) <a name=L39 href="source/kernel/vsprintf.c#L39">39</a> <a name=L40 href="source/kernel/vsprintf.c#L40">40</a> static char * <a href="ident?i=number">number</a>(char * <a href="ident?i=str">str</a>, int num, int base, int size, int precision <a name=L41 href="source/kernel/vsprintf.c#L41">41</a> ,int type) <a name=L42 href="source/kernel/vsprintf.c#L42">42</a> { <a name=L43 href="source/kernel/vsprintf.c#L43">43</a> char c,sign,tmp[36]; <a name=L44 href="source/kernel/vsprintf.c#L44">44</a> const char *digits=<i>"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"</i>; <a name=L45 href="source/kernel/vsprintf.c#L45">45</a> int i; <a name=L46 href="source/kernel/vsprintf.c#L46">46</a> <a name=L47 href="source/kernel/vsprintf.c#L47">47</a> if (type&<a href="ident?i=SMALL">SMALL</a>) digits=<i>"0123456789abcdefghijklmnopqrstuvwxyz"</i>; <a name=L48 href="source/kernel/vsprintf.c#L48">48</a> if (type&<a href="ident?i=LEFT">LEFT</a>) type &= ~ZEROPAD; <a name=L49 href="source/kernel/vsprintf.c#L49">49</a> if (base<2 || base>36) <a name=L50 href="source/kernel/vsprintf.c#L50">50</a> return 0; <a name=L51 href="source/kernel/vsprintf.c#L51">51</a> c = (type & <a href="ident?i=ZEROPAD">ZEROPAD</a>) ? <i>''</i> : <i>' '</i> ; <a name=L52 href="source/kernel/vsprintf.c#L52">52</a> if (type&<a href="ident?i=SIGN">SIGN</a> && num<0) { <a name=L53 href="source/kernel/vsprintf.c#L53">53</a> sign=<i>'-'</i>; <a name=L54 href="source/kernel/vsprintf.c#L54">54</a> num = -num; <a name=L55 href="source/kernel/vsprintf.c#L55">55</a> } else <a name=L56 href="source/kernel/vsprintf.c#L56">56</a> sign=(type&<a href="ident?i=PLUS">PLUS</a>) ? <i>'+'</i> : ((type&<a href="ident?i=SPACE">SPACE</a>) ? <i>' '</i> : 0); <a name=L57 href="source/kernel/vsprintf.c#L57">57</a> if (sign) size--; <a name=L58 href="source/kernel/vsprintf.c#L58">58</a> if (type&<a href="ident?i=SPECIAL">SPECIAL</a>) <a name=L59 href="source/kernel/vsprintf.c#L59">59</a> if (base==16) size -= 2; <a name=L60 href="source/kernel/vsprintf.c#L60">60</a> else if (base==8) size--; <a name=L61 href="source/kernel/vsprintf.c#L61">61</a> i=0; <a name=L62 href="source/kernel/vsprintf.c#L62">62</a> if (num==0) <a name=L63 href="source/kernel/vsprintf.c#L63">63</a> tmp[i++]=<i>''</i>; <a name=L64 href="source/kernel/vsprintf.c#L64">64</a> else while (num!=0) <a name=L65 href="source/kernel/vsprintf.c#L65">65</a> tmp[i++]=digits[<a href="ident?i=do_div">do_div</a>(num,base)]; <a name=L66 href="source/kernel/vsprintf.c#L66">66</a> if (i>precision) precision=i; <a name=L67 href="source/kernel/vsprintf.c#L67">67</a> size -= precision; <a name=L68 href="source/kernel/vsprintf.c#L68">68</a> if (!(type&(<a href="ident?i=ZEROPAD">ZEROPAD</a>+<a href="ident?i=LEFT">LEFT</a>))) <a name=L69 href="source/kernel/vsprintf.c#L69">69</a> while(size-->0) <a name=L70 href="source/kernel/vsprintf.c#L70">70</a> *<a href="ident?i=str">str</a>++ = <i>' '</i>; <a name=L71 href="source/kernel/vsprintf.c#L71">71</a> if (sign) <a name=L72 href="source/kernel/vsprintf.c#L72">72</a> *<a href="ident?i=str">str</a>++ = sign; <a name=L73 href="source/kernel/vsprintf.c#L73">73</a> if (type&<a href="ident?i=SPECIAL">SPECIAL</a>) <a name=L74 href="source/kernel/vsprintf.c#L74">74</a> if (base==8) <a name=L75 href="source/kernel/vsprintf.c#L75">75</a> *<a href="ident?i=str">str</a>++ = <i>''</i>; <a name=L76 href="source/kernel/vsprintf.c#L76">76</a> else if (base==16) { <a name=L77 href="source/kernel/vsprintf.c#L77">77</a> *<a href="ident?i=str">str</a>++ = <i>''</i>; <a name=L78 href="source/kernel/vsprintf.c#L78">78</a> *<a href="ident?i=str">str</a>++ = digits[33]; <a name=L79 href="source/kernel/vsprintf.c#L79">79</a> } <a name=L80 href="source/kernel/vsprintf.c#L80">80</a> if (!(type&<a href="ident?i=LEFT">LEFT</a>)) <a name=L81 href="source/kernel/vsprintf.c#L81">81</a> while(size-->0) <a name=L82 href="source/kernel/vsprintf.c#L82">82</a> *<a href="ident?i=str">str</a>++ = c; <a name=L83 href="source/kernel/vsprintf.c#L83">83</a> while(i<precision--) <a name=L84 href="source/kernel/vsprintf.c#L84">84</a> *<a href="ident?i=str">str</a>++ = <i>''</i>; <a name=L85 href="source/kernel/vsprintf.c#L85">85</a> while(i-->0) <a name=L86 href="source/kernel/vsprintf.c#L86">86</a> *<a href="ident?i=str">str</a>++ = tmp[i]; <a name=L87 href="source/kernel/vsprintf.c#L87">87</a> while(size-->0) <a name=L88 href="source/kernel/vsprintf.c#L88">88</a> *<a href="ident?i=str">str</a>++ = <i>' '</i>; <a name=L89 href="source/kernel/vsprintf.c#L89">89</a> return <a href="ident?i=str">str</a>; <a name=L90 href="source/kernel/vsprintf.c#L90">90</a> } <a name=L91 href="source/kernel/vsprintf.c#L91">91</a> <a name=L92 href="source/kernel/vsprintf.c#L92">92</a> int <a href="ident?i=vsprintf">vsprintf</a>(char *<a href="ident?i=buf">buf</a>, const char *fmt, <a href="ident?i=va_list">va_list</a> args) <a name=L93 href="source/kernel/vsprintf.c#L93">93</a> { <a name=L94 href="source/kernel/vsprintf.c#L94">94</a> int len; <a name=L95 href="source/kernel/vsprintf.c#L95">95</a> int i; <a name=L96 href="source/kernel/vsprintf.c#L96">96</a> char * <a href="ident?i=str">str</a>; <a name=L97 href="source/kernel/vsprintf.c#L97">97</a> char *s; <a name=L98 href="source/kernel/vsprintf.c#L98">98</a> int *ip; <a name=L99 href="source/kernel/vsprintf.c#L99">99</a> <a name=L100 href="source/kernel/vsprintf.c#L100">100</a> int flags; <b><i>/* flags to number() */</i></b><a name=L101 href="source/kernel/vsprintf.c#L101">101</a> <a name=L102 href="source/kernel/vsprintf.c#L102">102</a> int field_width; <b><i>/* width of output field */</i></b><a name=L103 href="source/kernel/vsprintf.c#L103">103</a> int precision; <b><i>/* min. # of digits for integers; max</i></b><a name=L104 href="source/kernel/vsprintf.c#L104">104</a> <b><i> number of chars for from string */</i></b><a name=L105 href="source/kernel/vsprintf.c#L105">105</a> int qualifier; <b><i>/* 'h', 'l', or 'L' for integer fields */</i></b><a name=L106 href="source/kernel/vsprintf.c#L106">106</a> <a name=L107 href="source/kernel/vsprintf.c#L107">107</a> for (<a href="ident?i=str">str</a>=<a href="ident?i=buf">buf</a> ; *fmt ; ++fmt) {⌨️ 快捷键说明
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