strncpy.html

来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 82 行

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>strncpy</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_009_153">&nbsp;</a>NAME</h4><blockquote>strncpy - copy part of a string</blockquote><h4><a name = "tag_000_009_154">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="string.h.html">string.h</a>&gt;char *strncpy(char *<i>s1</i>, const char *<i>s2</i>, size_t <i>n</i>);</code></pre></blockquote><h4><a name = "tag_000_009_155">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>strncpy()</i>function copies not more than<i>n</i>bytes (bytes that follow a null byte are notcopied) from the array pointed to by<i>s2</i>to the array pointed to by<i>s1</i>.If copying takes place between objects that overlap, thebehaviour is undefined.<p>If the array pointed to by<i>s2</i>is a string that is shorter than<i>n</i>bytes, null bytes are appended to the copy in the arraypointed to by<i>s1</i>,until<i>n</i>bytes in all are written.</blockquote><h4><a name = "tag_000_009_156">&nbsp;</a>RETURN VALUE</h4><blockquote>The<i>strncpy()</i>function returns<i>s1</i>;no return value is reserved to indicate an error.</blockquote><h4><a name = "tag_000_009_157">&nbsp;</a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_009_158">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_159">&nbsp;</a>APPLICATION USAGE</h4><blockquote>Character movement is performed differently in differentimplementations.Thus overlapping moves may yield surprises.<p>If there is no null byte in the first<i>n</i>bytes of the array pointed to by<i>s2</i>,the result will not be null-terminated.</blockquote><h4><a name = "tag_000_009_160">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_161">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="strcpy.html">strcpy()</a></i>,<i><a href="string.h.html">&lt;string.h&gt;</a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>

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