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<div class="title">fast_atof.h</div> </div>
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<a href="fast__atof_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (C) 2002-2012 Nikolaus Gebhardt</span>
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<a name="l00002"></a>00002 <span class="comment">// This file is part of the "Irrlicht Engine" and the "irrXML" project.</span>
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<a name="l00003"></a>00003 <span class="comment">// For conditions of distribution and use, see copyright notice in irrlicht.h and irrXML.h</span>
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<a name="l00004"></a>00004
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<a name="l00005"></a>00005 <span class="preprocessor">#ifndef __FAST_ATOF_H_INCLUDED__</span>
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<a name="l00006"></a>00006 <span class="preprocessor"></span><span class="preprocessor">#define __FAST_ATOF_H_INCLUDED__</span>
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<a name="l00007"></a>00007 <span class="preprocessor"></span>
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<a name="l00008"></a>00008 <span class="preprocessor">#include "<a class="code" href="irr_math_8h.html">irrMath.h</a>"</span>
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<a name="l00009"></a>00009 <span class="preprocessor">#include "<a class="code" href="irr_string_8h.html">irrString.h</a>"</span>
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<a name="l00010"></a>00010
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<a name="l00011"></a>00011 <span class="keyword">namespace </span>irr
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<a name="l00012"></a>00012 {
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<a name="l00013"></a>00013 <span class="keyword">namespace </span>core
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<a name="l00014"></a>00014 {
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<a name="l00016"></a>00016 <span class="comment">// TODO: This should probably also be used in irr::core::string, but the float-to-string code</span>
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<a name="l00017"></a>00017 <span class="comment">// used there has to be rewritten first.</span>
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<a name="l00018"></a>00018 <a class="code" href="_irr_compile_config_8h.html#aa93137544a73eaa2563931a1e665862d" title="Set FPU settings.">IRRLICHT_API</a> <span class="keyword">extern</span> <a class="code" href="classirr_1_1core_1_1string.html">irr::core::stringc</a> <a class="code" href="namespaceirr_1_1core.html#ac9e193c6850509dfee97f942b5f121a5" title="Selection of characters which count as decimal point in fast_atof.">LOCALE_DECIMAL_POINTS</a>;
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<a name="l00019"></a>00019
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<a name="l00020"></a>00020 <span class="comment">// we write [17] here instead of [] to work around a swig bug</span>
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<a name="l00021"></a><a class="code" href="namespaceirr_1_1core.html#ae473ba500eefc080b4680e3445e44b02">00021</a> <span class="keyword">const</span> <span class="keywordtype">float</span> <a class="code" href="namespaceirr_1_1core.html#ae473ba500eefc080b4680e3445e44b02">fast_atof_table</a>[17] = {
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<a name="l00022"></a>00022 0.f,
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||
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<a name="l00023"></a>00023 0.1f,
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<a name="l00024"></a>00024 0.01f,
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<a name="l00025"></a>00025 0.001f,
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<a name="l00026"></a>00026 0.0001f,
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<a name="l00027"></a>00027 0.00001f,
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<a name="l00028"></a>00028 0.000001f,
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<a name="l00029"></a>00029 0.0000001f,
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<a name="l00030"></a>00030 0.00000001f,
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<a name="l00031"></a>00031 0.000000001f,
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<a name="l00032"></a>00032 0.0000000001f,
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<a name="l00033"></a>00033 0.00000000001f,
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<a name="l00034"></a>00034 0.000000000001f,
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<a name="l00035"></a>00035 0.0000000000001f,
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<a name="l00036"></a>00036 0.00000000000001f,
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<a name="l00037"></a>00037 0.000000000000001f,
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<a name="l00038"></a>00038 0.0000000000000001f
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<a name="l00039"></a>00039 };
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<a name="l00040"></a>00040
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<a name="l00042"></a>00042
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<a name="l00049"></a><a class="code" href="namespaceirr_1_1core.html#ae7f759b603f4caaa8471cb9bc2e23648">00049</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#ae7f759b603f4caaa8471cb9bc2e23648" title="Convert a simple string of base 10 digits into an unsigned 32 bit integer.">strtoul10</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* in, <span class="keyword">const</span> <span class="keywordtype">char</span>** out=0)
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<a name="l00050"></a>00050 {
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<a name="l00051"></a>00051 <span class="keywordflow">if</span> (!in)
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<a name="l00052"></a>00052 {
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<a name="l00053"></a>00053 <span class="keywordflow">if</span> (out)
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<a name="l00054"></a>00054 *out = in;
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<a name="l00055"></a>00055 <span class="keywordflow">return</span> 0;
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<a name="l00056"></a>00056 }
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<a name="l00057"></a>00057
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<a name="l00058"></a>00058 <span class="keywordtype">bool</span> overflow=<span class="keyword">false</span>;
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<a name="l00059"></a>00059 <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> unsignedValue = 0;
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<a name="l00060"></a>00060 <span class="keywordflow">while</span> ( ( *in >= <span class="charliteral">'0'</span>) && ( *in <= <span class="charliteral">'9'</span> ))
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<a name="l00061"></a>00061 {
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<a name="l00062"></a>00062 <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> tmp = ( unsignedValue * 10 ) + ( *in - <span class="charliteral">'0'</span> );
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<a name="l00063"></a>00063 <span class="keywordflow">if</span> (tmp<unsignedValue)
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<a name="l00064"></a>00064 {
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<a name="l00065"></a>00065 unsignedValue=(<a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a>)0xffffffff;
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||
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<a name="l00066"></a>00066 overflow=<span class="keyword">true</span>;
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<a name="l00067"></a>00067 }
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<a name="l00068"></a>00068 <span class="keywordflow">if</span> (!overflow)
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<a name="l00069"></a>00069 unsignedValue = tmp;
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<a name="l00070"></a>00070 ++in;
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<a name="l00071"></a>00071 }
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<a name="l00072"></a>00072
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<a name="l00073"></a>00073 <span class="keywordflow">if</span> (out)
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<a name="l00074"></a>00074 *out = in;
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<a name="l00075"></a>00075
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<a name="l00076"></a>00076 <span class="keywordflow">return</span> unsignedValue;
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<a name="l00077"></a>00077 }
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<a name="l00078"></a>00078
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<a name="l00080"></a>00080
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<a name="l00089"></a><a class="code" href="namespaceirr_1_1core.html#a6ff97e442233218d18acd56add48766f">00089</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> <a class="code" href="namespaceirr_1_1core.html#a6ff97e442233218d18acd56add48766f" title="Convert a simple string of base 10 digits into a signed 32 bit integer.">strtol10</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* in, <span class="keyword">const</span> <span class="keywordtype">char</span>** out=0)
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<a name="l00090"></a>00090 {
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<a name="l00091"></a>00091 <span class="keywordflow">if</span> (!in)
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<a name="l00092"></a>00092 {
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||
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<a name="l00093"></a>00093 <span class="keywordflow">if</span> (out)
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||
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<a name="l00094"></a>00094 *out = in;
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||
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<a name="l00095"></a>00095 <span class="keywordflow">return</span> 0;
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<a name="l00096"></a>00096 }
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<a name="l00097"></a>00097
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<a name="l00098"></a>00098 <span class="keyword">const</span> <span class="keywordtype">bool</span> negative = (<span class="charliteral">'-'</span> == *in);
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<a name="l00099"></a>00099 <span class="keywordflow">if</span> (negative || (<span class="charliteral">'+'</span> == *in))
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<a name="l00100"></a>00100 ++in;
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<a name="l00101"></a>00101
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<a name="l00102"></a>00102 <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> unsignedValue = <a class="code" href="namespaceirr_1_1core.html#ae7f759b603f4caaa8471cb9bc2e23648" title="Convert a simple string of base 10 digits into an unsigned 32 bit integer.">strtoul10</a>(in,out);
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||
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<a name="l00103"></a>00103 <span class="keywordflow">if</span> (unsignedValue > (<a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a>)INT_MAX)
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<a name="l00104"></a>00104 {
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<a name="l00105"></a>00105 <span class="keywordflow">if</span> (negative)
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||
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<a name="l00106"></a>00106 <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>)INT_MIN;
|
||
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<a name="l00107"></a>00107 <span class="keywordflow">else</span>
|
||
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<a name="l00108"></a>00108 <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>)INT_MAX;
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||
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<a name="l00109"></a>00109 }
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||
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<a name="l00110"></a>00110 <span class="keywordflow">else</span>
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||
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<a name="l00111"></a>00111 {
|
||
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<a name="l00112"></a>00112 <span class="keywordflow">if</span> (negative)
|
||
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<a name="l00113"></a>00113 <span class="keywordflow">return</span> -((<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>)unsignedValue);
|
||
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<a name="l00114"></a>00114 <span class="keywordflow">else</span>
|
||
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<a name="l00115"></a>00115 <span class="keywordflow">return</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a>)unsignedValue;
|
||
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<a name="l00116"></a>00116 }
|
||
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<a name="l00117"></a>00117 }
|
||
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<a name="l00118"></a>00118
|
||
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<a name="l00120"></a>00120
|
||
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<a name="l00125"></a><a class="code" href="namespaceirr_1_1core.html#a8b818c2189b834bffacd522ff752c3a6">00125</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#a8b818c2189b834bffacd522ff752c3a6" title="Convert a hex-encoded character to an unsigned integer.">ctoul16</a>(<span class="keywordtype">char</span> in)
|
||
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|
<a name="l00126"></a>00126 {
|
||
|
|
<a name="l00127"></a>00127 <span class="keywordflow">if</span> (in >= <span class="charliteral">'0'</span> && in <= <span class="charliteral">'9'</span>)
|
||
|
|
<a name="l00128"></a>00128 <span class="keywordflow">return</span> in - <span class="charliteral">'0'</span>;
|
||
|
|
<a name="l00129"></a>00129 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (in >= <span class="charliteral">'a'</span> && in <= <span class="charliteral">'f'</span>)
|
||
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|
<a name="l00130"></a>00130 <span class="keywordflow">return</span> 10u + in - <span class="charliteral">'a'</span>;
|
||
|
|
<a name="l00131"></a>00131 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (in >= <span class="charliteral">'A'</span> && in <= <span class="charliteral">'F'</span>)
|
||
|
|
<a name="l00132"></a>00132 <span class="keywordflow">return</span> 10u + in - <span class="charliteral">'A'</span>;
|
||
|
|
<a name="l00133"></a>00133 <span class="keywordflow">else</span>
|
||
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|
<a name="l00134"></a>00134 <span class="keywordflow">return</span> 0xffffffff;
|
||
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<a name="l00135"></a>00135 }
|
||
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<a name="l00136"></a>00136
|
||
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<a name="l00138"></a>00138
|
||
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<a name="l00146"></a><a class="code" href="namespaceirr_1_1core.html#a96fa4fe7401b30c9057a0dbc7cd27c73">00146</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#a96fa4fe7401b30c9057a0dbc7cd27c73" title="Convert a simple string of base 16 digits into an unsigned 32 bit integer.">strtoul16</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* in, <span class="keyword">const</span> <span class="keywordtype">char</span>** out=0)
|
||
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<a name="l00147"></a>00147 {
|
||
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<a name="l00148"></a>00148 <span class="keywordflow">if</span> (!in)
|
||
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<a name="l00149"></a>00149 {
|
||
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<a name="l00150"></a>00150 <span class="keywordflow">if</span> (out)
|
||
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|
<a name="l00151"></a>00151 *out = in;
|
||
|
|
<a name="l00152"></a>00152 <span class="keywordflow">return</span> 0;
|
||
|
|
<a name="l00153"></a>00153 }
|
||
|
|
<a name="l00154"></a>00154
|
||
|
|
<a name="l00155"></a>00155 <span class="keywordtype">bool</span> overflow=<span class="keyword">false</span>;
|
||
|
|
<a name="l00156"></a>00156 <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> unsignedValue = 0;
|
||
|
|
<a name="l00157"></a>00157 <span class="keywordflow">while</span> (<span class="keyword">true</span>)
|
||
|
|
<a name="l00158"></a>00158 {
|
||
|
|
<a name="l00159"></a>00159 <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> tmp = 0;
|
||
|
|
<a name="l00160"></a>00160 <span class="keywordflow">if</span> ((*in >= <span class="charliteral">'0'</span>) && (*in <= <span class="charliteral">'9'</span>))
|
||
|
|
<a name="l00161"></a>00161 tmp = (unsignedValue << 4u) + (*in - <span class="charliteral">'0'</span>);
|
||
|
|
<a name="l00162"></a>00162 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((*in >= <span class="charliteral">'A'</span>) && (*in <= <span class="charliteral">'F'</span>))
|
||
|
|
<a name="l00163"></a>00163 tmp = (unsignedValue << 4u) + (*in - <span class="charliteral">'A'</span>) + 10;
|
||
|
|
<a name="l00164"></a>00164 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((*in >= <span class="charliteral">'a'</span>) && (*in <= <span class="charliteral">'f'</span>))
|
||
|
|
<a name="l00165"></a>00165 tmp = (unsignedValue << 4u) + (*in - <span class="charliteral">'a'</span>) + 10;
|
||
|
|
<a name="l00166"></a>00166 <span class="keywordflow">else</span>
|
||
|
|
<a name="l00167"></a>00167 <span class="keywordflow">break</span>;
|
||
|
|
<a name="l00168"></a>00168 <span class="keywordflow">if</span> (tmp<unsignedValue)
|
||
|
|
<a name="l00169"></a>00169 {
|
||
|
|
<a name="l00170"></a>00170 unsignedValue=(<a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a>)INT_MAX;
|
||
|
|
<a name="l00171"></a>00171 overflow=<span class="keyword">true</span>;
|
||
|
|
<a name="l00172"></a>00172 }
|
||
|
|
<a name="l00173"></a>00173 <span class="keywordflow">if</span> (!overflow)
|
||
|
|
<a name="l00174"></a>00174 unsignedValue = tmp;
|
||
|
|
<a name="l00175"></a>00175 ++in;
|
||
|
|
<a name="l00176"></a>00176 }
|
||
|
|
<a name="l00177"></a>00177
|
||
|
|
<a name="l00178"></a>00178 <span class="keywordflow">if</span> (out)
|
||
|
|
<a name="l00179"></a>00179 *out = in;
|
||
|
|
<a name="l00180"></a>00180
|
||
|
|
<a name="l00181"></a>00181 <span class="keywordflow">return</span> unsignedValue;
|
||
|
|
<a name="l00182"></a>00182 }
|
||
|
|
<a name="l00183"></a>00183
|
||
|
|
<a name="l00185"></a>00185
|
||
|
|
<a name="l00193"></a><a class="code" href="namespaceirr_1_1core.html#a005590192e3f22d79759d98d42844b38">00193</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#a005590192e3f22d79759d98d42844b38" title="Convert a simple string of base 8 digits into an unsigned 32 bit integer.">strtoul8</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* in, <span class="keyword">const</span> <span class="keywordtype">char</span>** out=0)
|
||
|
|
<a name="l00194"></a>00194 {
|
||
|
|
<a name="l00195"></a>00195 <span class="keywordflow">if</span> (!in)
|
||
|
|
<a name="l00196"></a>00196 {
|
||
|
|
<a name="l00197"></a>00197 <span class="keywordflow">if</span> (out)
|
||
|
|
<a name="l00198"></a>00198 *out = in;
|
||
|
|
<a name="l00199"></a>00199 <span class="keywordflow">return</span> 0;
|
||
|
|
<a name="l00200"></a>00200 }
|
||
|
|
<a name="l00201"></a>00201
|
||
|
|
<a name="l00202"></a>00202 <span class="keywordtype">bool</span> overflow=<span class="keyword">false</span>;
|
||
|
|
<a name="l00203"></a>00203 <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> unsignedValue = 0;
|
||
|
|
<a name="l00204"></a>00204 <span class="keywordflow">while</span> (<span class="keyword">true</span>)
|
||
|
|
<a name="l00205"></a>00205 {
|
||
|
|
<a name="l00206"></a>00206 <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> tmp = 0;
|
||
|
|
<a name="l00207"></a>00207 <span class="keywordflow">if</span> ((*in >= <span class="charliteral">'0'</span>) && (*in <= <span class="charliteral">'7'</span>))
|
||
|
|
<a name="l00208"></a>00208 tmp = (unsignedValue << 3u) + (*in - <span class="charliteral">'0'</span>);
|
||
|
|
<a name="l00209"></a>00209 <span class="keywordflow">else</span>
|
||
|
|
<a name="l00210"></a>00210 <span class="keywordflow">break</span>;
|
||
|
|
<a name="l00211"></a>00211 <span class="keywordflow">if</span> (tmp<unsignedValue)
|
||
|
|
<a name="l00212"></a>00212 {
|
||
|
|
<a name="l00213"></a>00213 unsignedValue=(<a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a>)INT_MAX;
|
||
|
|
<a name="l00214"></a>00214 overflow=<span class="keyword">true</span>;
|
||
|
|
<a name="l00215"></a>00215 }
|
||
|
|
<a name="l00216"></a>00216 <span class="keywordflow">if</span> (!overflow)
|
||
|
|
<a name="l00217"></a>00217 unsignedValue = tmp;
|
||
|
|
<a name="l00218"></a>00218 ++in;
|
||
|
|
<a name="l00219"></a>00219 }
|
||
|
|
<a name="l00220"></a>00220
|
||
|
|
<a name="l00221"></a>00221 <span class="keywordflow">if</span> (out)
|
||
|
|
<a name="l00222"></a>00222 *out = in;
|
||
|
|
<a name="l00223"></a>00223
|
||
|
|
<a name="l00224"></a>00224 <span class="keywordflow">return</span> unsignedValue;
|
||
|
|
<a name="l00225"></a>00225 }
|
||
|
|
<a name="l00226"></a>00226
|
||
|
|
<a name="l00228"></a>00228
|
||
|
|
<a name="l00236"></a><a class="code" href="namespaceirr_1_1core.html#ad67ad09c33fe26fa9a15aa10ded801b7">00236</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> <a class="code" href="namespaceirr_1_1core.html#ad67ad09c33fe26fa9a15aa10ded801b7" title="Convert a C-style prefixed string (hex, oct, integer) into an unsigned 32 bit integer.">strtoul_prefix</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* in, <span class="keyword">const</span> <span class="keywordtype">char</span>** out=0)
|
||
|
|
<a name="l00237"></a>00237 {
|
||
|
|
<a name="l00238"></a>00238 <span class="keywordflow">if</span> (!in)
|
||
|
|
<a name="l00239"></a>00239 {
|
||
|
|
<a name="l00240"></a>00240 <span class="keywordflow">if</span> (out)
|
||
|
|
<a name="l00241"></a>00241 *out = in;
|
||
|
|
<a name="l00242"></a>00242 <span class="keywordflow">return</span> 0;
|
||
|
|
<a name="l00243"></a>00243 }
|
||
|
|
<a name="l00244"></a>00244 <span class="keywordflow">if</span> (<span class="charliteral">'0'</span>==in[0])
|
||
|
|
<a name="l00245"></a>00245 <span class="keywordflow">return</span> (<span class="charliteral">'x'</span>==in[1] ? <a class="code" href="namespaceirr_1_1core.html#a96fa4fe7401b30c9057a0dbc7cd27c73" title="Convert a simple string of base 16 digits into an unsigned 32 bit integer.">strtoul16</a>(in+2,out) : <a class="code" href="namespaceirr_1_1core.html#a005590192e3f22d79759d98d42844b38" title="Convert a simple string of base 8 digits into an unsigned 32 bit integer.">strtoul8</a>(in+1,out));
|
||
|
|
<a name="l00246"></a>00246 <span class="keywordflow">return</span> <a class="code" href="namespaceirr_1_1core.html#ae7f759b603f4caaa8471cb9bc2e23648" title="Convert a simple string of base 10 digits into an unsigned 32 bit integer.">strtoul10</a>(in,out);
|
||
|
|
<a name="l00247"></a>00247 }
|
||
|
|
<a name="l00248"></a>00248
|
||
|
|
<a name="l00250"></a>00250
|
||
|
|
<a name="l00258"></a><a class="code" href="namespaceirr_1_1core.html#a032ec5ae63987749c7b30c18ea4ccd92">00258</a> <span class="keyword">inline</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> <a class="code" href="namespaceirr_1_1core.html#a032ec5ae63987749c7b30c18ea4ccd92" title="Converts a sequence of digits into a whole positive floating point value.">strtof10</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* in, <span class="keyword">const</span> <span class="keywordtype">char</span>** out = 0)
|
||
|
|
<a name="l00259"></a>00259 {
|
||
|
|
<a name="l00260"></a>00260 <span class="keywordflow">if</span> (!in)
|
||
|
|
<a name="l00261"></a>00261 {
|
||
|
|
<a name="l00262"></a>00262 <span class="keywordflow">if</span> (out)
|
||
|
|
<a name="l00263"></a>00263 *out = in;
|
||
|
|
<a name="l00264"></a>00264 <span class="keywordflow">return</span> 0.f;
|
||
|
|
<a name="l00265"></a>00265 }
|
||
|
|
<a name="l00266"></a>00266
|
||
|
|
<a name="l00267"></a>00267 <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> MAX_SAFE_U32_VALUE = UINT_MAX / 10 - 10;
|
||
|
|
<a name="l00268"></a>00268 <a class="code" href="namespaceirr.html#a0416a53257075833e7002efd0a18e804" title="32 bit unsigned variable.">u32</a> intValue = 0;
|
||
|
|
<a name="l00269"></a>00269
|
||
|
|
<a name="l00270"></a>00270 <span class="comment">// Use integer arithmetic for as long as possible, for speed</span>
|
||
|
|
<a name="l00271"></a>00271 <span class="comment">// and precision.</span>
|
||
|
|
<a name="l00272"></a>00272 <span class="keywordflow">while</span> ( ( *in >= <span class="charliteral">'0'</span>) && ( *in <= <span class="charliteral">'9'</span> ) )
|
||
|
|
<a name="l00273"></a>00273 {
|
||
|
|
<a name="l00274"></a>00274 <span class="comment">// If it looks like we're going to overflow, bail out</span>
|
||
|
|
<a name="l00275"></a>00275 <span class="comment">// now and start using floating point.</span>
|
||
|
|
<a name="l00276"></a>00276 <span class="keywordflow">if</span> (intValue >= MAX_SAFE_U32_VALUE)
|
||
|
|
<a name="l00277"></a>00277 <span class="keywordflow">break</span>;
|
||
|
|
<a name="l00278"></a>00278
|
||
|
|
<a name="l00279"></a>00279 intValue = (intValue * 10) + (*in - <span class="charliteral">'0'</span>);
|
||
|
|
<a name="l00280"></a>00280 ++in;
|
||
|
|
<a name="l00281"></a>00281 }
|
||
|
|
<a name="l00282"></a>00282
|
||
|
|
<a name="l00283"></a>00283 <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> floatValue = (<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a>)intValue;
|
||
|
|
<a name="l00284"></a>00284
|
||
|
|
<a name="l00285"></a>00285 <span class="comment">// If there are any digits left to parse, then we need to use</span>
|
||
|
|
<a name="l00286"></a>00286 <span class="comment">// floating point arithmetic from here.</span>
|
||
|
|
<a name="l00287"></a>00287 <span class="keywordflow">while</span> ( ( *in >= <span class="charliteral">'0'</span>) && ( *in <= <span class="charliteral">'9'</span> ) )
|
||
|
|
<a name="l00288"></a>00288 {
|
||
|
|
<a name="l00289"></a>00289 floatValue = (floatValue * 10.f) + (<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a>)(*in - <span class="charliteral">'0'</span>);
|
||
|
|
<a name="l00290"></a>00290 ++in;
|
||
|
|
<a name="l00291"></a>00291 <span class="keywordflow">if</span> (floatValue > <a class="code" href="irr_math_8h.html#a7fbf1534f9e0f0bfdb86fb928902474c">FLT_MAX</a>) <span class="comment">// Just give up.</span>
|
||
|
|
<a name="l00292"></a>00292 <span class="keywordflow">break</span>;
|
||
|
|
<a name="l00293"></a>00293 }
|
||
|
|
<a name="l00294"></a>00294
|
||
|
|
<a name="l00295"></a>00295 <span class="keywordflow">if</span> (out)
|
||
|
|
<a name="l00296"></a>00296 *out = in;
|
||
|
|
<a name="l00297"></a>00297
|
||
|
|
<a name="l00298"></a>00298 <span class="keywordflow">return</span> floatValue;
|
||
|
|
<a name="l00299"></a>00299 }
|
||
|
|
<a name="l00300"></a>00300
|
||
|
|
<a name="l00302"></a>00302
|
||
|
|
<a name="l00309"></a><a class="code" href="namespaceirr_1_1core.html#ae5806ec05e45a700461890ec5e6f602a">00309</a> <span class="keyword">inline</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="namespaceirr_1_1core.html#ae5806ec05e45a700461890ec5e6f602a" title="Provides a fast function for converting a string into a float.">fast_atof_move</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* in, <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a>& result)
|
||
|
|
<a name="l00310"></a>00310 {
|
||
|
|
<a name="l00311"></a>00311 <span class="comment">// Please run the regression test when making any modifications to this function.</span>
|
||
|
|
<a name="l00312"></a>00312
|
||
|
|
<a name="l00313"></a>00313 result = 0.f;
|
||
|
|
<a name="l00314"></a>00314 <span class="keywordflow">if</span> (!in)
|
||
|
|
<a name="l00315"></a>00315 <span class="keywordflow">return</span> 0;
|
||
|
|
<a name="l00316"></a>00316
|
||
|
|
<a name="l00317"></a>00317 <span class="keyword">const</span> <span class="keywordtype">bool</span> negative = (<span class="charliteral">'-'</span> == *in);
|
||
|
|
<a name="l00318"></a>00318 <span class="keywordflow">if</span> (negative || (<span class="charliteral">'+'</span>==*in))
|
||
|
|
<a name="l00319"></a>00319 ++in;
|
||
|
|
<a name="l00320"></a>00320
|
||
|
|
<a name="l00321"></a>00321 <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> value = <a class="code" href="namespaceirr_1_1core.html#a032ec5ae63987749c7b30c18ea4ccd92" title="Converts a sequence of digits into a whole positive floating point value.">strtof10</a>(in, &in);
|
||
|
|
<a name="l00322"></a>00322
|
||
|
|
<a name="l00323"></a>00323 <span class="keywordflow">if</span> ( <a class="code" href="namespaceirr_1_1core.html#ac9e193c6850509dfee97f942b5f121a5" title="Selection of characters which count as decimal point in fast_atof.">LOCALE_DECIMAL_POINTS</a>.<a class="code" href="classirr_1_1core_1_1string.html#afa7db686b05dff5d10b30a900082036b" title="finds first occurrence of character in string">findFirst</a>(*in) >= 0 )
|
||
|
|
<a name="l00324"></a>00324 {
|
||
|
|
<a name="l00325"></a>00325 <span class="keyword">const</span> <span class="keywordtype">char</span>* afterDecimal = ++in;
|
||
|
|
<a name="l00326"></a>00326 <span class="keyword">const</span> <a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a> decimal = <a class="code" href="namespaceirr_1_1core.html#a032ec5ae63987749c7b30c18ea4ccd92" title="Converts a sequence of digits into a whole positive floating point value.">strtof10</a>(in, &afterDecimal);
|
||
|
|
<a name="l00327"></a>00327 value += decimal * <a class="code" href="namespaceirr_1_1core.html#ae473ba500eefc080b4680e3445e44b02">fast_atof_table</a>[afterDecimal - in];
|
||
|
|
<a name="l00328"></a>00328 in = afterDecimal;
|
||
|
|
<a name="l00329"></a>00329 }
|
||
|
|
<a name="l00330"></a>00330
|
||
|
|
<a name="l00331"></a>00331 <span class="keywordflow">if</span> (<span class="charliteral">'e'</span> == *in || <span class="charliteral">'E'</span> == *in)
|
||
|
|
<a name="l00332"></a>00332 {
|
||
|
|
<a name="l00333"></a>00333 ++in;
|
||
|
|
<a name="l00334"></a>00334 <span class="comment">// Assume that the exponent is a whole number.</span>
|
||
|
|
<a name="l00335"></a>00335 <span class="comment">// strtol10() will deal with both + and - signs,</span>
|
||
|
|
<a name="l00336"></a>00336 <span class="comment">// but calculate as f32 to prevent overflow at FLT_MAX</span>
|
||
|
|
<a name="l00337"></a>00337 value *= powf(10.f, (<a class="code" href="namespaceirr.html#a0277be98d67dc26ff93b1a6a1d086b07" title="32 bit floating point variable.">f32</a>)<a class="code" href="namespaceirr_1_1core.html#a6ff97e442233218d18acd56add48766f" title="Convert a simple string of base 10 digits into a signed 32 bit integer.">strtol10</a>(in, &in));
|
||
|
|
<a name="l00338"></a>00338 }
|
||
|
|
<a name="l00339"></a>00339
|
||
|
|
<a name="l00340"></a>00340 result = negative?-value:value;
|
||
|
|
<a name="l00341"></a>00341 <span class="keywordflow">return</span> in;
|
||
|
|
<a name="l00342"></a>00342 }
|
||
|
|
<a name="l00343"></a>00343
|
||
|
|
<a name="l00345"></a>00345
|
||
|
|
<a name="l00350"></a><a class="code" href="namespaceirr_1_1core.html#af69b7d3604a1089438106fcce3cedb34">00350</a> <span class="keyword">inline</span> <span class="keywordtype">float</span> <a class="code" href="namespaceirr_1_1core.html#af69b7d3604a1089438106fcce3cedb34" title="Convert a string to a floating point number.">fast_atof</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* floatAsString, <span class="keyword">const</span> <span class="keywordtype">char</span>** out=0)
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<a name="l00351"></a>00351 {
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<a name="l00352"></a>00352 <span class="keywordtype">float</span> ret;
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<a name="l00353"></a>00353 <span class="keywordflow">if</span> (out)
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<a name="l00354"></a>00354 *out=<a class="code" href="namespaceirr_1_1core.html#ae5806ec05e45a700461890ec5e6f602a" title="Provides a fast function for converting a string into a float.">fast_atof_move</a>(floatAsString, ret);
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<a name="l00355"></a>00355 <span class="keywordflow">else</span>
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<a name="l00356"></a>00356 <a class="code" href="namespaceirr_1_1core.html#ae5806ec05e45a700461890ec5e6f602a" title="Provides a fast function for converting a string into a float.">fast_atof_move</a>(floatAsString, ret);
|
||
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<a name="l00357"></a>00357 <span class="keywordflow">return</span> ret;
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<a name="l00358"></a>00358 }
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<a name="l00359"></a>00359
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<a name="l00360"></a>00360 } <span class="comment">// end namespace core</span>
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<a name="l00361"></a>00361 } <span class="comment">// end namespace irr</span>
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<a name="l00362"></a>00362
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<a name="l00363"></a>00363 <span class="preprocessor">#endif</span>
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<a name="l00364"></a>00364 <span class="preprocessor"></span>
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</pre></div></div>
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