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+    <h1 id="firstHeading" class="firstHeading">wcscat, wcscat_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 *wcscat( wchar_t *dest, const wchar_t *src );</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 *wcscat( wchar_t *restrict dest, const wchar_t *restrict src );</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 wcscat_s( wchar_t *restrict dest, rsize_t destsz,
+                  const wchar_t *restrict src );</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> Appends a copy of the wide string pointed to by <code>src</code> to the end of the wide string pointed to by <code>dest</code>. The wide character <code>src[0]</code> replaces the null terminator at the end of <code>dest</code>. The resulting wide string is null-terminated. The behavior is undefined if the destination array is not large enough for the contents of both <code>str</code> and <code>dest</code> and the terminating null wide character. The behavior is undefined if the strings overlap. </div> <div class="t-li1">
+<span class="t-li">2)</span> Same as <span class="t-v">(1)</span>, except that it may clobber the rest of the destination array (from the last character written to <code>destsz</code>) with unspecified values and 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> is zero or greater than <code>RSIZE_MAX/sizeof(wchar_t)</code> </li>
+<li> there is no null terminator in the first <code>destsz</code> wide characters of <code>dest</code> </li>
+<li> truncation would occur (the available space at the end of <code>dest</code> would not fit every wide character, including the null terminator, of <code>src</code>) </li>
+<li> overlap would occur between the source and the destination strings </li>
+</ul> </dd>
+<dd>As with all bounds-checked functions, <code>wcscat_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 null-terminated wide string to append to </td>
+</tr> <tr class="t-par"> <td> src </td> <td> - </td> <td> pointer to the null-terminated wide string to copy from </td>
+</tr> <tr class="t-par"> <td> destsz </td> <td> - </td> <td> maximum number of characters to write, typically 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, writes <code>L'\0'</code> to <code>dest[0]</code> (unless <code>dest</code> is a null pointer or <code>destsz</code> is zero or greater than <code>RSIZE_MAX/sizeof(wchar_t)</code>).</div> <h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;wchar.h&gt; 
+#include &lt;stdio.h&gt;
+#include &lt;locale.h&gt;
+ 
+int main(void) 
+{
+    wchar_t str[50] = L"Земля, прощай.";
+    wcscat(str, L" ");
+    wcscat(str, L"В добрый путь.");
+    setlocale(LC_ALL, "en_US.utf8");
+    printf("%ls", str);
+}</pre></div> <p>Output:</p>
+<div class="text source-text"><pre data-language="c">Земля, прощай. В добрый путь.</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C17 standard (ISO/IEC 9899:2018): </li>
+<ul>
+<li> 7.29.4.3.1 The wcscat function (p: 315) </li>
+<li> K.3.9.2.2.1 The wcscat_s function (p: 466) </li>
+</ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul>
+<li> 7.29.4.3.1 The wcscat function (p: 432) </li>
+<li> K.3.9.2.2.1 The wcscat_s function (p: 642-643) </li>
+</ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.24.4.3.1 The wcscat function (p: 378) </li></ul>
+</ul>             <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="wcsncat" title="c/string/wide/wcsncat"> <span class="t-lines"><span>wcsncat</span><span>wcsncat_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> appends a certain amount of wide characters from one wide string to another <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="../byte/strcat" title="c/string/byte/strcat"> <span class="t-lines"><span>strcat</span><span>strcat_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> concatenates two strings <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="wcscpy" title="c/string/wide/wcscpy"> <span class="t-lines"><span>wcscpy</span><span>wcscpy_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 one wide 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/wcscat" title="cpp/string/wide/wcscat">C++ documentation</a></span> for <code>wcscat</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/wcscat" class="_attribution-link">https://en.cppreference.com/w/c/string/wide/wcscat</a>
+  </p>
+</div>