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authorCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
committerCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
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- <h1 id="firstHeading" class="firstHeading">rename</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;stdio.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">int rename( const char* old_filename, const char* new_filename );</pre>
-</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> </table> <p>Changes the filename of a file. The file is identified by character string pointed to by <code>old_filename</code>. The new filename is identified by character string pointed to by <code>new_filename</code>.</p>
-<p>If <code>new_filename</code> exists, the behavior is implementation-defined.</p>
-<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> old_filename </td> <td> - </td> <td> pointer to a null-terminated string containing the path identifying the file to rename </td>
-</tr> <tr class="t-par"> <td> new_filename </td> <td> - </td> <td> pointer to a null-terminated string containing the new path of the file </td>
-</tr>
-</table> <h3 id="Return_value"> Return value</h3> <p><code>​0​</code> upon success or non-zero value on error.</p>
-<h3 id="Notes"> Notes</h3> <p><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html">POSIX</a> specifies many additional details on the semantics of this function.</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;stdlib.h&gt;
-
-int main(void)
-{
- FILE* fp = fopen("from.txt", "w"); // create file "from.txt"
- if (!fp)
- {
- perror("from.txt");
- return EXIT_FAILURE;
- }
- fputc('a', fp); // write to "from.txt"
- fclose(fp);
-
- int rc = rename("from.txt", "to.txt");
- if (rc)
- {
- perror("rename");
- return EXIT_FAILURE;
- }
-
- fp = fopen("to.txt", "r");
- if(!fp)
- {
- perror("to.txt");
- return EXIT_FAILURE;
- }
- printf("%c\n", fgetc(fp)); // read from "to.txt"
- fclose(fp);
-
- return EXIT_SUCCESS;
-}</pre></div> <p>Possible output:</p>
-<div class="text source-text"><pre data-language="c">a</pre></div> </div> <h3 id="References"> References</h3> <ul>
-<li> C23 standard (ISO/IEC 9899:2023): </li>
-<ul><li> 7.21.4.2 The rename function (p: TBD) </li></ul>
-<li> C17 standard (ISO/IEC 9899:2018): </li>
-<ul><li> 7.21.4.2 The rename function (p: TBD) </li></ul>
-<li> C11 standard (ISO/IEC 9899:2011): </li>
-<ul><li> 7.21.4.2 The rename function (p: 302-303) </li></ul>
-<li> C99 standard (ISO/IEC 9899:1999): </li>
-<ul><li> 7.19.4.2 The rename function (p: 268-269) </li></ul>
-<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
-<ul><li> 4.9.4.2 The rename function </li></ul>
-</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="remove" title="c/io/remove"> <span class="t-lines"><span>remove</span></span></a></div> </td> <td> erases a file <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/io/c/rename" title="cpp/io/c/rename">C++ documentation</a></span> for <code>rename</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/io/rename" class="_attribution-link">https://en.cppreference.com/w/c/io/rename</a>
- </p>
-</div>