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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>Chapter 2. Basic C Library Functions</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="index.html" title="The Linux Kernel API" /><link rel="prev" href="re38.html" title="hlist_for_each_entry_safe" /><link rel="next" href="re39.html" title="simple_strtoll" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 2. Basic C Library Functions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re38.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="re39.html">Next</a></td></tr></table><hr /></div><div class="chapter" title="Chapter 2. Basic C Library Functions"><div class="titlepage"><div><div><h2 class="title"><a id="libc"></a>Chapter 2. Basic C Library Functions</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="ch02.html#id2621104">String Conversions</a></span></dt><dt><span class="sect1"><a href="ch02s02.html">String Manipulation</a></span></dt><dt><span class="sect1"><a href="ch02s03.html">Bit Operations</a></span></dt></dl></div><p>
When writing drivers, you cannot in general use routines which are
from the C Library. Some of the functions have been found generally
useful and they are listed below. The behaviour of these functions
may vary slightly from those defined by ANSI, and these deviations
are noted in the text.
</p><div class="sect1" title="String Conversions"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="id2621104"></a>String Conversions</h2></div></div></div><div class="toc"><dl><dt><span class="refentrytitle"><a href="re39.html"><span>simple_strtoll</span></a></span><span class="refpurpose"> —
convert a string to a signed long long
</span></dt><dt><span class="refentrytitle"><a href="re40.html"><span>simple_strtoul</span></a></span><span class="refpurpose"> —
convert a string to an unsigned long
</span></dt><dt><span class="refentrytitle"><a href="re41.html"><span>simple_strtol</span></a></span><span class="refpurpose"> —
convert a string to a signed long
</span></dt><dt><span class="refentrytitle"><a href="re42.html"><span>simple_strtoull</span></a></span><span class="refpurpose"> —
convert a string to an unsigned long long
</span></dt><dt><span class="refentrytitle"><a href="re43.html"><span>strict_strtoul</span></a></span><span class="refpurpose"> —
convert a string to an unsigned long strictly
</span></dt><dt><span class="refentrytitle"><a href="re44.html"><span>strict_strtol</span></a></span><span class="refpurpose"> —
convert a string to a long strictly
</span></dt><dt><span class="refentrytitle"><a href="re45.html"><span>strict_strtoull</span></a></span><span class="refpurpose"> —
convert a string to an unsigned long long strictly
</span></dt><dt><span class="refentrytitle"><a href="re46.html"><span>strict_strtoll</span></a></span><span class="refpurpose"> —
convert a string to a long long strictly
</span></dt><dt><span class="refentrytitle"><a href="re47.html"><span>vsnprintf</span></a></span><span class="refpurpose"> —
Format a string and place it in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re48.html"><span>vscnprintf</span></a></span><span class="refpurpose"> —
Format a string and place it in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re49.html"><span>snprintf</span></a></span><span class="refpurpose"> —
Format a string and place it in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re50.html"><span>scnprintf</span></a></span><span class="refpurpose"> —
Format a string and place it in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re51.html"><span>vsprintf</span></a></span><span class="refpurpose"> —
Format a string and place it in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re52.html"><span>sprintf</span></a></span><span class="refpurpose"> —
Format a string and place it in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re53.html"><span>vbin_printf</span></a></span><span class="refpurpose"> —
Parse a format string and place args' binary value in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re54.html"><span>bstr_printf</span></a></span><span class="refpurpose"> —
Format a string from binary arguments and place it in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re55.html"><span>bprintf</span></a></span><span class="refpurpose"> —
Parse a format string and place args' binary value in a buffer
</span></dt><dt><span class="refentrytitle"><a href="re56.html"><span>vsscanf</span></a></span><span class="refpurpose"> —
Unformat a buffer into a list of arguments
</span></dt><dt><span class="refentrytitle"><a href="re57.html"><span>sscanf</span></a></span><span class="refpurpose"> —
Unformat a buffer into a list of arguments
</span></dt></dl></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re38.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="re39.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>hlist_for_each_entry_safe</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>simple_strtoll</span></td></tr></table></div></body></html>
