160 lines
4.0 KiB
HTML
160 lines
4.0 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of MEMPCPY</TITLE>
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</HEAD><BODY>
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<H1>MEMPCPY</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2015-03-02<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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mempcpy, wmempcpy - copy memory area
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#define _GNU_SOURCE</B> /* See <A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A>(7) */
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<B>#include <<A HREF="file:///usr/include/string.h">string.h</A>></B>
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<B>void *mempcpy(void *</B><I>dest</I><B>, const void *</B><I>src</I><B>, size_t </B><I>n</I><B>);</B>
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<B>#define _GNU_SOURCE</B> /* See <A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A>(7) */
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<B>#include <<A HREF="file:///usr/include/wchar.h">wchar.h</A>></B>
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<B>wchar_t *wmempcpy(wchar_t *</B><I>dest</I><B>, const wchar_t *</B><I>src</I><B>, size_t </B><I>n</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>mempcpy</B>()
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function is nearly identical to the
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<B><A HREF="/cgi-bin/man/man2html?3+memcpy">memcpy</A></B>(3)
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function.
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It copies
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<I>n</I>
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bytes from the object beginning at
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<I>src</I>
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into the object pointed to by
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<I>dest</I>.
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But instead of returning the value of
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<I>dest</I>
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it returns a pointer to the byte following the last written byte.
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<P>
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This function is useful in situations where a number of objects
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shall be copied to consecutive memory positions.
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<P>
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The
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<B>wmempcpy</B>()
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function is identical but takes
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<I>wchar_t</I>
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type arguments and copies
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<I>n</I>
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wide characters.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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<I>dest</I>
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+
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<I>n</I>.
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<A NAME="lbAF"> </A>
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<H2>VERSIONS</H2>
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<B>mempcpy</B>()
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first appeared in glibc in version 2.1.
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<A NAME="lbAG"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>mempcpy</B>(),
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<B>wmempcpy</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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This function is a GNU extension.
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<A NAME="lbAI"> </A>
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<H2>EXAMPLE</H2>
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void *
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combine(void *o1, size_t s1, void *o2, size_t s2)
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{
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<BR> void *result = malloc(s1 + s2);
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<BR> if (result != NULL)
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<BR> mempcpy(mempcpy(result, o1, s1), o2, s2);
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<BR> return result;
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}
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+memccpy">memccpy</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+memcpy">memcpy</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+memmove">memmove</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+wmemcpy">wmemcpy</A></B>(3)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="5"><A HREF="#lbAF">VERSIONS</A><DD>
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<DT id="6"><A HREF="#lbAG">ATTRIBUTES</A><DD>
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<DT id="7"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="8"><A HREF="#lbAI">EXAMPLE</A><DD>
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<DT id="9"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="10"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:48 GMT, March 31, 2021
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</BODY>
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</HTML>
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