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2 <head>
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3 <title>Wisdom Import - FFTW 3.2.1</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.2.1">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="up" href="Wisdom.html#Wisdom" title="Wisdom">
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9 <link rel="prev" href="Wisdom-Export.html#Wisdom-Export" title="Wisdom Export">
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10 <link rel="next" href="Forgetting-Wisdom.html#Forgetting-Wisdom" title="Forgetting Wisdom">
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11 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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12 <!--
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13 This manual is for FFTW
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14 (version 3.2.1, 5 February 2009).
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15
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16 Copyright (C) 2003 Matteo Frigo.
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17
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18 Copyright (C) 2003 Massachusetts Institute of Technology.
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19
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20 Permission is granted to make and distribute verbatim copies of
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21 this manual provided the copyright notice and this permission
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22 notice are preserved on all copies.
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23
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24 Permission is granted to copy and distribute modified versions of
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25 this manual under the conditions for verbatim copying, provided
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26 that the entire resulting derived work is distributed under the
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27 terms of a permission notice identical to this one.
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28
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29 Permission is granted to copy and distribute translations of this
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30 manual into another language, under the above conditions for
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31 modified versions, except that this permission notice may be
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32 stated in a translation approved by the Free Software Foundation.
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33 -->
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34 <meta http-equiv="Content-Style-Type" content="text/css">
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35 <style type="text/css"><!--
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36 pre.display { font-family:inherit }
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44 span.sansserif { font-family:sans-serif; font-weight:normal; }
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45 --></style>
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46 </head>
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47 <body>
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48 <div class="node">
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49 <p>
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50 <a name="Wisdom-Import"></a>
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51 Next: <a rel="next" accesskey="n" href="Forgetting-Wisdom.html#Forgetting-Wisdom">Forgetting Wisdom</a>,
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52 Previous: <a rel="previous" accesskey="p" href="Wisdom-Export.html#Wisdom-Export">Wisdom Export</a>,
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53 Up: <a rel="up" accesskey="u" href="Wisdom.html#Wisdom">Wisdom</a>
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54 <hr>
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55 </div>
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56
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57 <h4 class="subsection">4.7.2 Wisdom Import</h4>
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58
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59 <pre class="example"> int fftw_import_system_wisdom(void);
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60 int fftw_import_wisdom_from_file(FILE *input_file);
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61 int fftw_import_wisdom_from_string(const char *input_string);
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62 int fftw_import_wisdom(int (*read_char)(void *), void *data);
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63 </pre>
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64 <p><a name="index-fftw_005fimport_005fwisdom-273"></a><a name="index-fftw_005fimport_005fsystem_005fwisdom-274"></a><a name="index-fftw_005fimport_005fwisdom_005ffrom_005ffile-275"></a><a name="index-fftw_005fimport_005fwisdom_005ffrom_005fstring-276"></a>
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65 These functions import wisdom into a program from data stored by the
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66 <code>fftw_export_wisdom</code> functions above. (See <a href="Words-of-Wisdom_002dSaving-Plans.html#Words-of-Wisdom_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.) The imported wisdom replaces any wisdom
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67 already accumulated by the running program.
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68
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69 <p><code>fftw_import_wisdom</code> imports wisdom from any input medium, as
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70 specified by the callback function <code>read_char</code>. <code>read_char</code> is
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71 a <code>getc</code>-like function that returns the next character in the
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72 input; its parameter is the <code>data</code> pointer passed to
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73 <code>fftw_import_wisdom</code>. If the end of the input data is reached
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74 (which should never happen for valid data), <code>read_char</code> should
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75 return <code>EOF</code> (as defined in <code><stdio.h></code>). For convenience,
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76 the following two “wrapper” routines are provided:
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77
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78 <p><code>fftw_import_wisdom_from_file</code> reads wisdom from the current
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79 position in <code>input_file</code>, which should be open with read
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80 permission. Upon exit, the file remains open, but the position of the
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81 read pointer is unspecified.
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82
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83 <p><code>fftw_import_wisdom_from_string</code> reads wisdom from the
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84 <code>NULL</code>-terminated string <code>input_string</code>.
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85
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86 <p><code>fftw_import_system_wisdom</code> reads wisdom from an
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87 implementation-defined standard file (<code>/etc/fftw/wisdom</code> on Unix
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88 and GNU systems).
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89 <a name="index-wisdom_002c-system_002dwide-277"></a>
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90 The return value of these import routines is <code>1</code> if the wisdom was
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91 read successfully and <code>0</code> otherwise. Note that, in all of these
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92 functions, any data in the input stream past the end of the wisdom data
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93 is simply ignored.
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94
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95 <!-- =========> -->
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96 </body></html>
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97
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