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+<title>Translate filenames</title>
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+<!-- keywords: sqlite3_filename_database sqlite3_filename_journal sqlite3_filename_wal -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Translate filenames</h2>
+</div>
+<blockquote><pre>
+const char *sqlite3_filename_database(sqlite3_filename);
+const char *sqlite3_filename_journal(sqlite3_filename);
+const char *sqlite3_filename_wal(sqlite3_filename);
+</pre></blockquote>
+<p>
+These routines are available to <a href="../vfs.html">custom VFS implementations</a> for
+translating filenames between the main database file, the journal file,
+and the WAL file.</p>
+
+<p>If F is the name of an sqlite database file, journal file, or WAL file
+passed by the SQLite core into the VFS, then sqlite3_filename_database(F)
+returns the name of the corresponding database file.</p>
+
+<p>If F is the name of an sqlite database file, journal file, or WAL file
+passed by the SQLite core into the VFS, or if F is a database filename
+obtained from <a href="../c3ref/db_filename.html">sqlite3_db_filename()</a>, then sqlite3_filename_journal(F)
+returns the name of the corresponding rollback journal file.</p>
+
+<p>If F is the name of an sqlite database file, journal file, or WAL file
+that was passed by the SQLite core into the VFS, or if F is a database
+filename obtained from <a href="../c3ref/db_filename.html">sqlite3_db_filename()</a>, then
+sqlite3_filename_wal(F) returns the name of the corresponding
+WAL file.</p>
+
+<p>In all of the above, if F is not the name of a database, journal or WAL
+filename passed into the VFS from the SQLite core and F is not the
+return value from <a href="../c3ref/db_filename.html">sqlite3_db_filename()</a>, then the result is
+undefined and is likely a memory access violation.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+