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<h4 class="subsection">4.7.1 Wisdom Export</h4>
<pre class="example"> int fftw_export_wisdom_to_filename(const char *filename);
void fftw_export_wisdom_to_file(FILE *output_file);
char *fftw_export_wisdom_to_string(void);
void fftw_export_wisdom(void (*write_char)(char c, void *), void *data);
</pre>
<p><a name="index-fftw_005fexport_005fwisdom-278"></a><a name="index-fftw_005fexport_005fwisdom_005fto_005ffilename-279"></a><a name="index-fftw_005fexport_005fwisdom_005fto_005ffile-280"></a><a name="index-fftw_005fexport_005fwisdom_005fto_005fstring-281"></a>
These functions allow you to export all currently accumulated wisdom
in a form from which it can be later imported and restored, even
during a separate run of the program. (See <a href="Words-of-Wisdom_002dSaving-Plans.html#Words-of-Wisdom_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.) The current store of wisdom is not affected by calling any
of these routines.
<p><code>fftw_export_wisdom</code> exports the wisdom to any output
medium, as specified by the callback function
<code>write_char</code>. <code>write_char</code> is a <code>putc</code>-like function that
writes the character <code>c</code> to some output; its second parameter is
the <code>data</code> pointer passed to <code>fftw_export_wisdom</code>. For
convenience, the following three “wrapper” routines are provided:
<p><code>fftw_export_wisdom_to_filename</code> writes wisdom to a file named
<code>filename</code> (which is created or overwritten), returning <code>1</code>
on success and <code>0</code> on failure. A lower-level function, which
requires you to open and close the file yourself (e.g. if you want to
write wisdom to a portion of a larger file) is
<code>fftw_export_wisdom_to_file</code>. This writes the wisdom to the
current position in <code>output_file</code>, which should be open with
write permission; upon exit, the file remains open and is positioned
at the end of the wisdom data.
<p><code>fftw_export_wisdom_to_string</code> returns a pointer to a
<code>NULL</code>-terminated string holding the wisdom data. This string is
dynamically allocated, and it is the responsibility of the caller to
deallocate it with <code>free</code> when it is no longer needed.
<p>All of these routines export the wisdom in the same format, which we
will not document here except to say that it is LISP-like ASCII text
that is insensitive to white space.
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