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<div class="title">strtol.c</div>  </div>
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<a href="strtol_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2002-2018 The UbixOS Project.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * This was developed by Christopher W. Olsen for the UbixOS Project.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * Redistribution and use in source and binary forms, with or without modification, are permitted</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * provided that the following conditions are met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * 1) Redistributions of source code must retain the above copyright notice, this list of</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> *    conditions, the following disclaimer and the list of authors.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * 2) Redistributions in binary form must reproduce the above copyright notice, this list of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> *    conditions, the following disclaimer and the list of authors in the documentation and/or</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> *    other materials provided with the distribution.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> *    endorse or promote products derived from this software without specific prior written</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"> *    permission.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment"> * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160; </div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="cdefs_8h.html">sys/cdefs.h</a>&gt;</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">//#include &lt;limits.h&gt;</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">//#include &lt;ctype.h&gt;</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">//#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160; </div>
<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="strtol_8c.html#ae8a44c5a7436466221e0f3859d02420f">   34</a></span>&#160;<span class="preprocessor">#define LONG_MIN      (-0x7fffffffL - 1)</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="strtol_8c.html#a50fece4db74f09568b2938db583c5655">   35</a></span>&#160;<span class="preprocessor">#define LONG_MAX      0x7fffffffL</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160; </div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="strtol_8c.html#a23a80e470a9dae66d16e7d25fbba122a">   37</a></span>&#160;<span class="keywordtype">long</span> <a class="code" href="strtol_8c.html#a23a80e470a9dae66d16e7d25fbba122a">strtol</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> * <a class="code" href="cdefs_8h.html#a4127c12268159bf73f8e69b23c34c610">__restrict</a> nptr, <span class="keywordtype">char</span> ** <a class="code" href="cdefs_8h.html#a4127c12268159bf73f8e69b23c34c610">__restrict</a> endptr, <span class="keywordtype">int</span> base) {</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;  <span class="keyword">const</span> <span class="keywordtype">char</span> *s;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> acc;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;  <span class="keywordtype">char</span> c = 0x0; <span class="comment">/* to remove warning */</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> cutoff;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  <span class="keywordtype">int</span> neg, any, cutlim;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160; </div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;  <span class="comment">/*</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">   * Skip white space and pick up leading +/- sign if any.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">   * If base is 0, allow 0x for hex and 0 for octal, else</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment">   * assume decimal; if base is already 16, allow 0x.</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">   */</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;  s = nptr;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;  <span class="comment">/*</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">   do {</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">   c = *s++;</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">   } while (isspace((unsigned char)c));</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">   */</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;  <span class="keywordflow">if</span> (c == <span class="charliteral">&#39;-&#39;</span>) {</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    neg = 1;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    c = *s++;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;  }</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    neg = 0;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    <span class="keywordflow">if</span> (c == <span class="charliteral">&#39;+&#39;</span>)</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;      c = *s++;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;  }</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;  <span class="keywordflow">if</span> ((base == 0 || base == 16) &amp;&amp; c == <span class="charliteral">&#39;0&#39;</span> &amp;&amp; (*s == <span class="charliteral">&#39;x&#39;</span> || *s == <span class="charliteral">&#39;X&#39;</span>)) {</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    c = s[1];</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    s += 2;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    base = 16;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;  }</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;  <span class="keywordflow">if</span> (base == 0)</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    base = c == <span class="charliteral">&#39;0&#39;</span> ? 8 : 10;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;  acc = any = 0;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;  <span class="keywordflow">if</span> (base &lt; 2 || base &gt; 36)</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="keywordflow">goto</span> noconv;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160; </div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;  <span class="comment">/*</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">   * Compute the cutoff value between legal numbers and illegal</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment">   * numbers.  That is the largest legal value, divided by the</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment">   * base.  An input number that is greater than this value, if</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment">   * followed by a legal input character, is too big.  One that</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="comment">   * is equal to this value may be valid or not; the limit</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment">   * between valid and invalid numbers is then based on the last</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment">   * digit.  For instance, if the range for longs is</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment">   * [-2147483648..2147483647] and the input base is 10,</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">   * cutoff will be set to 214748364 and cutlim to either</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment">   * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">   * a value &gt; 214748364, or equal but the next digit is &gt; 7 (or 8),</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">   * the number is too big, and we will return a range error.</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment">   *</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment">   * Set &#39;any&#39; if any `digits&#39; consumed; make it negative to indicate</span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment">   * overflow.</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment">   */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;  cutoff = neg ? (<span class="keywordtype">unsigned</span> long) -(<a class="code" href="strtol_8c.html#ae8a44c5a7436466221e0f3859d02420f">LONG_MIN</a> + <a class="code" href="strtol_8c.html#a50fece4db74f09568b2938db583c5655">LONG_MAX</a>) + <a class="code" href="strtol_8c.html#a50fece4db74f09568b2938db583c5655">LONG_MAX</a> : <a class="code" href="strtol_8c.html#a50fece4db74f09568b2938db583c5655">LONG_MAX</a>;</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;  cutlim = cutoff % base;</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;  cutoff /= base;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;  <span class="keywordflow">for</span> (;; c = *s++) {</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="keywordflow">if</span> (c &gt;= <span class="charliteral">&#39;0&#39;</span> &amp;&amp; c &lt;= <span class="charliteral">&#39;9&#39;</span>)</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;      c -= <span class="charliteral">&#39;0&#39;</span>;</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c &gt;= <span class="charliteral">&#39;A&#39;</span> &amp;&amp; c &lt;= <span class="charliteral">&#39;Z&#39;</span>)</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;      c -= <span class="charliteral">&#39;A&#39;</span> - 10;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c &gt;= <span class="charliteral">&#39;a&#39;</span> &amp;&amp; c &lt;= <span class="charliteral">&#39;z&#39;</span>)</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;      c -= <span class="charliteral">&#39;a&#39;</span> - 10;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    <span class="keywordflow">else</span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <span class="keywordflow">if</span> (c &gt;= base)</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;      <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    <span class="keywordflow">if</span> (any &lt; 0 || acc &gt; cutoff || (acc == cutoff &amp;&amp; c &gt; cutlim))</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;      any = -1;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;      any = 1;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;      acc *= base;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;      acc += c;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    }</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  }</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;  <span class="keywordflow">if</span> (any &lt; 0) {</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    acc = neg ? <a class="code" href="strtol_8c.html#ae8a44c5a7436466221e0f3859d02420f">LONG_MIN</a> : <a class="code" href="strtol_8c.html#a50fece4db74f09568b2938db583c5655">LONG_MAX</a>;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    <span class="comment">//errno = ERANGE;</span></div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;  }</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!any) {</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    noconv:</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    <span class="comment">//errno = EINVAL;</span></div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    cutoff = 0x0; <span class="comment">//UBU</span></div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;  }</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (neg)</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    acc = -acc;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;  <span class="keywordflow">if</span> (endptr != 0x0)</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    *endptr = (<span class="keywordtype">char</span> *) (any ? s - 1 : nptr);</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;  <span class="keywordflow">return</span> (acc);</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;}</div>
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