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+    <h1 id="firstHeading" class="firstHeading">wmemcpy, wmemcpy_s</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;wchar.h&gt;</code> </th> <th> </th> <th> </th> </tr>  <tr class="t-dcl-rev-aux"> <td></td> <td rowspan="3">(1)</td> <td></td> </tr> <tr class="t-dcl t-since-c95 t-until-c99"> <td> <pre data-language="c">wchar_t* wmemcpy( wchar_t* dest, const wchar_t* src, size_t count );</pre>
+</td>  <td> <span class="t-mark-rev t-since-c95">(since C95)</span> <br><span class="t-mark-rev t-until-c99">(until C99)</span> </td> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">wchar_t *wmemcpy(wchar_t *restrict dest, const wchar_t *restrict src,
+                 size_t count );</pre>
+</td>  <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr>  <tr class="t-dcl t-since-c11"> <td> <pre data-language="c">errno_t wmemcpy_s( wchar_t *restrict dest, rsize_t destsz,
+                   const wchar_t *restrict src, rsize_t count );</pre>
+</td> <td> (2) </td> <td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> </tr>  </table> <div class="t-li1">
+<span class="t-li">1)</span> Copies exactly <code>count</code> successive wide characters from the wide character array pointed to by <code>src</code> to the wide character array pointed to by <code>dest</code>. If the objects overlap, the behavior is undefined. If <code>count</code> is zero, the function does nothing.</div> <div class="t-li1">
+<span class="t-li">2)</span> Same as <span class="t-v">(1)</span>, except that the following errors are detected at runtime and call the currently installed <a href="../../error/set_constraint_handler_s" title="c/error/set constraint handler s">constraint handler</a> function: <dl>
+<dd>
+<ul>
+<li> <code>src</code> or <code>dest</code> is a null pointer </li>
+<li> <code>destsz</code> or <code>count</code> is greater than <code>RSIZE_MAX/sizeof(wchar_t)</code> </li>
+<li> <code>count</code> is greater than <code>destsz</code> (overflow would occur) </li>
+<li> overlap would occur between the source and the destination arrays </li>
+</ul> </dd>
+<dd>As with all bounds-checked functions, <code>wmemcpy_s</code> only guaranteed to be available if <code>__STDC_LIB_EXT1__</code> is defined by the implementation and if the user defines <code>__STDC_WANT_LIB_EXT1__</code> to the integer constant <code>1</code> before including <a href="../wide" title="c/string/wide"><code>&lt;wchar.h&gt;</code></a>.</dd>
+</dl>
+</div>  <h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> dest </td> <td> - </td> <td> pointer to the wide character array to copy to </td>
+</tr> <tr class="t-par"> <td> src </td> <td> - </td> <td> pointer to the wide character array to copy from </td>
+</tr> <tr class="t-par"> <td> count </td> <td> - </td> <td> number of wide characters to copy </td>
+</tr> <tr class="t-par"> <td> destsz </td> <td> - </td> <td> max number of wide characters to write (the size of the destination buffer) </td>
+</tr>
+</table> <h3 id="Return_value"> Return value</h3> <div class="t-li1">
+<span class="t-li">1)</span> returns a copy of <code>dest</code>
+</div> <div class="t-li1">
+<span class="t-li">2)</span> returns zero on success, returns non-zero on error. Also, on error, fills the entire <code>dst</code> up to and not including <code>dst+dstsz</code> with null wide characters, <code>L'\0'</code> (unless <code>dest</code> is null or <code>destsz</code> is greater than <code>RSIZE_MAX/sizeof(wchar_t)</code>)</div> <h3 id="Notes"> Notes</h3> <p>This function's analog for byte strings is <code><a href="../byte/strncpy" title="c/string/byte/strncpy">strncpy</a></code>, not <code><a href="../byte/strcpy" title="c/string/byte/strcpy">strcpy</a></code>.</p>
+<p>This function is not locale-sensitive and pays no attention to the values of the <code>wchar_t</code> objects it copies: nulls as well as invalid characters are copied too.</p>
+<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;stdio.h&gt;
+#include &lt;wchar.h&gt;
+#include &lt;locale.h&gt;
+ 
+int main(void)
+{
+    wchar_t from1[] = L"नमस्ते";
+    size_t sz1 = sizeof from1 / sizeof *from1;
+    wchar_t from2[] = L"Բարև";
+    size_t sz2 = sizeof from2 / sizeof *from2;
+    wchar_t to[sz1 + sz2];
+    wmemcpy(to, from1, sz1); // copy from1, along with its null terminator
+    wmemcpy(to + sz1, from2, sz2); // append from2, along with its null terminator
+ 
+    setlocale(LC_ALL, "en_US.utf8");
+    printf("Wide array contains: ");
+    for(size_t n = 0; n &lt; sizeof to / sizeof *to; ++n)
+        if(to[n])
+            printf("%lc", to[n]);
+        else
+            printf("\\0");
+    printf("\n");
+}</pre></div> <p>Possible output:</p>
+<div class="text source-text"><pre data-language="c">Wide array contains: नमस्ते\0Բարև\0</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul>
+<li> 7.29.4.2.3 The wmemcpy function (p: 431) </li>
+<li> K.3.9.2.1.3 The wmemcpy_s function (p: 641) </li>
+</ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.24.4.2.3 The wmemcpy function (p: 377) </li></ul>
+</ul>       <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="wmemmove" title="c/string/wide/wmemmove"> <span class="t-lines"><span>wmemmove</span><span>wmemmove_s</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div> </td> <td> copies a certain amount of wide characters between two, possibly overlapping, arrays <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="../byte/strncpy" title="c/string/byte/strncpy"> <span class="t-lines"><span>strncpy</span><span>strncpy_s</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div> </td> <td> copies a certain amount of characters from one string to another <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/string/wide/wmemcpy" title="cpp/string/wide/wmemcpy">C++ documentation</a></span> for <code>wmemcpy</code> </td>
+</tr> </table>           <div class="_attribution">
+  <p class="_attribution-p">
+    &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
+    <a href="https://en.cppreference.com/w/c/string/wide/wmemcpy" class="_attribution-link">https://en.cppreference.com/w/c/string/wide/wmemcpy</a>
+  </p>
+</div>