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<a class="el" href="dir_897b6a2d7bab147dd1db58381aad3984.html">src</a> » <a class="el" href="dir_832905b1f7f5feaf61a306b40c0ac817.html">sys</a> » <a class="el" href="dir_d9dcf62a8e8b4cc91cbf2445d76a799b.html">lib</a></div>
<h1>strtol.c</h1><a href="strtol_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include <<a class="code" href="cdefs_8h.html">sys/cdefs.h</a>></span>
<a name="l00002"></a>00002 <span class="comment">//#include <limits.h></span>
<a name="l00003"></a>00003 <span class="comment">//#include <ctype.h></span>
<a name="l00004"></a>00004 <span class="comment">//#include <stdlib.h></span>
<a name="l00005"></a>00005
<a name="l00006"></a><a class="code" href="strtol_8c.html#e8a44c5a7436466221e0f3859d02420f">00006</a> <span class="preprocessor">#define LONG_MIN (-0x7fffffffL - 1)</span>
<a name="l00007"></a><a class="code" href="strtol_8c.html#50fece4db74f09568b2938db583c5655">00007</a> <span class="preprocessor"></span><span class="preprocessor">#define LONG_MAX 0x7fffffffL</span>
<a name="l00008"></a>00008 <span class="preprocessor"></span>
<a name="l00009"></a>00009
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="keywordtype">long</span>
<a name="l00012"></a><a class="code" href="strtol_8c.html#23a80e470a9dae66d16e7d25fbba122a">00012</a> <a class="code" href="string_8h.html#23a80e470a9dae66d16e7d25fbba122a">strtol</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> * __restrict nptr, <span class="keywordtype">char</span> ** __restrict endptr, <span class="keywordtype">int</span> base)
<a name="l00013"></a>00013 {
<a name="l00014"></a>00014 <span class="keyword">const</span> <span class="keywordtype">char</span> *s;
<a name="l00015"></a>00015 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> acc;
<a name="l00016"></a>00016 <span class="keywordtype">char</span> c = 0x0; <span class="comment">/* to remove warning */</span>
<a name="l00017"></a>00017 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> cutoff;
<a name="l00018"></a>00018 <span class="keywordtype">int</span> neg, any, cutlim;
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="comment">/*</span>
<a name="l00021"></a>00021 <span class="comment"> * Skip white space and pick up leading +/- sign if any.</span>
<a name="l00022"></a>00022 <span class="comment"> * If base is 0, allow 0x for hex and 0 for octal, else</span>
<a name="l00023"></a>00023 <span class="comment"> * assume decimal; if base is already 16, allow 0x.</span>
<a name="l00024"></a>00024 <span class="comment"> */</span>
<a name="l00025"></a>00025 s = nptr;
<a name="l00026"></a>00026 <span class="comment">/*</span>
<a name="l00027"></a>00027 <span class="comment"> do {</span>
<a name="l00028"></a>00028 <span class="comment"> c = *s++;</span>
<a name="l00029"></a>00029 <span class="comment"> } while (isspace((unsigned char)c));</span>
<a name="l00030"></a>00030 <span class="comment"> */</span>
<a name="l00031"></a>00031 <span class="keywordflow">if</span> (c == <span class="charliteral">'-'</span>) {
<a name="l00032"></a>00032 neg = 1;
<a name="l00033"></a>00033 c = *s++;
<a name="l00034"></a>00034 } <span class="keywordflow">else</span> {
<a name="l00035"></a>00035 neg = 0;
<a name="l00036"></a>00036 <span class="keywordflow">if</span> (c == <span class="charliteral">'+'</span>)
<a name="l00037"></a>00037 c = *s++;
<a name="l00038"></a>00038 }
<a name="l00039"></a>00039 <span class="keywordflow">if</span> ((base == 0 || base == 16) &&
<a name="l00040"></a>00040 c == <span class="charliteral">'0'</span> && (*s == <span class="charliteral">'x'</span> || *s == <span class="charliteral">'X'</span>)) {
<a name="l00041"></a>00041 c = s[1];
<a name="l00042"></a>00042 s += 2;
<a name="l00043"></a>00043 base = 16;
<a name="l00044"></a>00044 }
<a name="l00045"></a>00045 <span class="keywordflow">if</span> (base == 0)
<a name="l00046"></a>00046 base = c == <span class="charliteral">'0'</span> ? 8 : 10;
<a name="l00047"></a>00047 acc = any = 0;
<a name="l00048"></a>00048 <span class="keywordflow">if</span> (base < 2 || base > 36)
<a name="l00049"></a>00049 <span class="keywordflow">goto</span> noconv;
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="comment">/*</span>
<a name="l00052"></a>00052 <span class="comment"> * Compute the cutoff value between legal numbers and illegal</span>
<a name="l00053"></a>00053 <span class="comment"> * numbers. That is the largest legal value, divided by the</span>
<a name="l00054"></a>00054 <span class="comment"> * base. An input number that is greater than this value, if</span>
<a name="l00055"></a>00055 <span class="comment"> * followed by a legal input character, is too big. One that</span>
<a name="l00056"></a>00056 <span class="comment"> * is equal to this value may be valid or not; the limit</span>
<a name="l00057"></a>00057 <span class="comment"> * between valid and invalid numbers is then based on the last</span>
<a name="l00058"></a>00058 <span class="comment"> * digit. For instance, if the range for longs is</span>
<a name="l00059"></a>00059 <span class="comment"> * [-2147483648..2147483647] and the input base is 10,</span>
<a name="l00060"></a>00060 <span class="comment"> * cutoff will be set to 214748364 and cutlim to either</span>
<a name="l00061"></a>00061 <span class="comment"> * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated</span>
<a name="l00062"></a>00062 <span class="comment"> * a value > 214748364, or equal but the next digit is > 7 (or 8),</span>
<a name="l00063"></a>00063 <span class="comment"> * the number is too big, and we will return a range error.</span>
<a name="l00064"></a>00064 <span class="comment"> *</span>
<a name="l00065"></a>00065 <span class="comment"> * Set 'any' if any `digits' consumed; make it negative to indicate</span>
<a name="l00066"></a>00066 <span class="comment"> * overflow.</span>
<a name="l00067"></a>00067 <span class="comment"> */</span>
<a name="l00068"></a>00068 cutoff = neg ? (<span class="keywordtype">unsigned</span> long)-(<a class="code" href="strtol_8c.html#e8a44c5a7436466221e0f3859d02420f">LONG_MIN</a> + <a class="code" href="strtol_8c.html#50fece4db74f09568b2938db583c5655">LONG_MAX</a>) + <a class="code" href="strtol_8c.html#50fece4db74f09568b2938db583c5655">LONG_MAX</a>
<a name="l00069"></a>00069 : <a class="code" href="strtol_8c.html#50fece4db74f09568b2938db583c5655">LONG_MAX</a>;
<a name="l00070"></a>00070 cutlim = cutoff % base;
<a name="l00071"></a>00071 cutoff /= base;
<a name="l00072"></a>00072 <span class="keywordflow">for</span> ( ; ; c = *s++) {
<a name="l00073"></a>00073 <span class="keywordflow">if</span> (c >= <span class="charliteral">'0'</span> && c <= <span class="charliteral">'9'</span>)
<a name="l00074"></a>00074 c -= <span class="charliteral">'0'</span>;
<a name="l00075"></a>00075 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c >= <span class="charliteral">'A'</span> && c <= <span class="charliteral">'Z'</span>)
<a name="l00076"></a>00076 c -= <span class="charliteral">'A'</span> - 10;
<a name="l00077"></a>00077 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c >= <span class="charliteral">'a'</span> && c <= <span class="charliteral">'z'</span>)
<a name="l00078"></a>00078 c -= <span class="charliteral">'a'</span> - 10;
<a name="l00079"></a>00079 <span class="keywordflow">else</span>
<a name="l00080"></a>00080 <span class="keywordflow">break</span>;
<a name="l00081"></a>00081 <span class="keywordflow">if</span> (c >= base)
<a name="l00082"></a>00082 <span class="keywordflow">break</span>;
<a name="l00083"></a>00083 <span class="keywordflow">if</span> (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
<a name="l00084"></a>00084 any = -1;
<a name="l00085"></a>00085 <span class="keywordflow">else</span> {
<a name="l00086"></a>00086 any = 1;
<a name="l00087"></a>00087 acc *= base;
<a name="l00088"></a>00088 acc += c;
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 <span class="keywordflow">if</span> (any < 0) {
<a name="l00092"></a>00092 acc = neg ? <a class="code" href="strtol_8c.html#e8a44c5a7436466221e0f3859d02420f">LONG_MIN</a> : <a class="code" href="strtol_8c.html#50fece4db74f09568b2938db583c5655">LONG_MAX</a>;
<a name="l00093"></a>00093 <span class="comment">//errno = ERANGE;</span>
<a name="l00094"></a>00094 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!any) {
<a name="l00095"></a>00095 noconv:
<a name="l00096"></a>00096 <span class="comment">//errno = EINVAL;</span>
<a name="l00097"></a>00097 cutoff = 0x0;<span class="comment">//UBU</span>
<a name="l00098"></a>00098 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (neg)
<a name="l00099"></a>00099 acc = -acc;
<a name="l00100"></a>00100 <span class="keywordflow">if</span> (endptr != <a class="code" href="types_8h.html#070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>)
<a name="l00101"></a>00101 *endptr = (<span class="keywordtype">char</span> *)(any ? s - 1 : nptr);
<a name="l00102"></a>00102 <span class="keywordflow">return</span> (acc);
<a name="l00103"></a>00103 }
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