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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>strict_strtoull</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch02.html#id2621104" title="String Conversions" /><link rel="prev" href="re44.html" title="strict_strtol" /><link rel="next" href="re46.html" title="strict_strtoll" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>strict_strtoull</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re44.html">Prev</a> </td><th width="60%" align="center">String Conversions</th><td width="20%" align="right"> <a accesskey="n" href="re46.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="strict_strtoull"><a id="API-strict-strtoull"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>strict_strtoull —
convert a string to an unsigned long long strictly
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">strict_strtoull </b>(</code></td><td>const char * <var class="pdparam">cp</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">base</var>, </td></tr><tr><td> </td><td>unsigned long long * <var class="pdparam">res</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2622132"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>cp</code></em></span></dt><dd><p>
The string to be converted
</p></dd><dt><span class="term"><em class="parameter"><code>base</code></em></span></dt><dd><p>
The number base to use
</p></dd><dt><span class="term"><em class="parameter"><code>res</code></em></span></dt><dd><p>
The converted result value
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2622192"></a><h2>Description</h2><p>
strict_strtoull converts a string to an unsigned long long only if the
string is really an unsigned long long string, any string containing
any invalid char at the tail will be rejected and -EINVAL is returned,
only a newline char at the tail is acceptible because people generally
</p></div><div class="refsect1" title="change a module parameter in the following way"><a id="id2622206"></a><h2>change a module parameter in the following way</h2><p>
</p><p>
echo 1024 > /sys/module/e1000/parameters/copybreak
</p><p>
echo will append a newline to the tail of the string.
</p><p>
It returns 0 if conversion is successful and *res is set to the converted
value, otherwise it returns -EINVAL and *res is set to 0.
</p><p>
simple_strtoull just ignores the successive invalid characters and
return the converted value of prefix part of the string.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re44.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html#id2621104">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re46.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>strict_strtol</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>strict_strtoll</span></td></tr></table></div></body></html>
