128 lines
4.4 KiB
HTML
128 lines
4.4 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>strncpy</title>
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<basefont size="3"> <a name="strncpy"></a> <a name="tag_03_734"></a><!-- strncpy -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_734_01"></a>NAME</h4>
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<blockquote>strncpy - copy part of a string</blockquote>
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<h4><a name="tag_03_734_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/string.h.html">string.h</a>><br>
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<br>
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char *strncpy(char *restrict</tt> <i>s1</i><tt>, const char *restrict</tt> <i>s2</i><tt>, size_t</tt> <i>n</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_734_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i>strncpy</i>() function shall copy not more than <i>n</i> bytes (bytes that follow a null byte are not copied) from the
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array pointed to by <i>s2</i> to the array pointed to by <i>s1</i>. If copying takes place between objects that overlap, the
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behavior is undefined.</p>
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<p>If the array pointed to by <i>s2</i> is a string that is shorter than <i>n</i> bytes, null bytes shall be appended to the copy
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in the array pointed to by <i>s1</i>, until <i>n</i> bytes in all are written.</p>
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</blockquote>
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<h4><a name="tag_03_734_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>strncpy</i>() function shall return <i>s1</i>; no return value is reserved to indicate an error.</p>
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</blockquote>
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<h4><a name="tag_03_734_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_734_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_734_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>Character movement is performed differently in different implementations. Thus, overlapping moves may yield surprises.</p>
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<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 is not
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null-terminated.</p>
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</blockquote>
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<h4><a name="tag_03_734_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_734_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_734_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="strcpy.html"><i>strcpy</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/string.h.html"><i><string.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_734_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_734_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>strncpy</i>() prototype is updated for alignment with the ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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