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add -L flag to cause leaks(1) command to run just before exit
author Skip Montanaro <skip@pobox.com>
date Sun, 06 Jun 2004 15:53:18 +0000
parents d41d8de9768f
children 8747bf4b9542
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
28671
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
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1 \section{\module{stringprep} ---
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2 Internet String Preparation}
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3
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4 \declaremodule{standard}{stringprep}
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5 \modulesynopsis{String preparation, as per RFC 3453}
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6 \moduleauthor{Martin v. L\"owis}{martin@v.loewis.de}
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7 \sectionauthor{Martin v. L\"owis}{martin@v.loewis.de}
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8
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9 When identifying things (such as host names) in the internet, it is
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10 often necessary to compare such identifications for
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11 ``equality''. Exactly how this comparison is executed may depend on
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12 the application domain, e.g. whether it should be case-insensitive or
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13 not. It may be also necessary to restrict the possible
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14 identifications, to allow only identifications consisting of
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15 ``printable'' characters.
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16
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17 \rfc{3454} defines a procedure for ``preparing'' Unicode strings in
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18 internet protocols. Before passing strings onto the wire, they are
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19 processed with the preparation procedure, after which they have a
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20 certain normalized form. The RFC defines a set of tables, which can be
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21 combined into profiles. Each profile must define which tables it uses,
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22 and what other optional parts of the \code{stringprep} procedure are
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23 part of the profile. One example of a \code{stringprep} profile is
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24 \code{nameprep}, which is used for internationalized domain names.
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25
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26 The module \module{stringprep} only exposes the tables from RFC
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27 3454. As these tables would be very large to represent them as
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28 dictionaries or lists, the module uses the Unicode character database
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29 internally. The module source code itself was generated using the
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30 \code{mkstringprep.py} utility.
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31
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32 As a result, these tables are exposed as functions, not as data
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33 structures. There are two kinds of tables in the RFC: sets and
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34 mappings. For a set, \module{stringprep} provides the ``characteristic
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35 function'', i.e. a function that returns true if the parameter is part
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36 of the set. For mappings, it provides the mapping function: given the
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37 key, it returns the associated value. Below is a list of all functions
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38 available in the module.
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39
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40 \begin{funcdesc}{in_table_a1}{code}
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41 Determine whether \var{code} is in table{A.1} (Unassigned code points
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42 in Unicode 3.2).
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43 \end{funcdesc}
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44
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45 \begin{funcdesc}{in_table_b1}{code}
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46 Determine whether \var{code} is in table{B.1} (Commonly mapped to
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47 nothing).
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48 \end{funcdesc}
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49
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50 \begin{funcdesc}{map_table_b2}{code}
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51 Return the mapped value for \var{code} according to table{B.2}
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52 (Mapping for case-folding used with NFKC).
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53 \end{funcdesc}
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54
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55 \begin{funcdesc}{map_table_b3}{code}
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56 Return the mapped value for \var{code} according to table{B.3}
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57 (Mapping for case-folding used with no normalization).
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58 \end{funcdesc}
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59
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60 \begin{funcdesc}{in_table_c11}{code}
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61 Determine whether \var{code} is in table{C.1.1}
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62 (ASCII space characters).
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63 \end{funcdesc}
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64
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65 \begin{funcdesc}{in_table_c12}{code}
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66 Determine whether \var{code} is in table{C.1.2}
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67 (Non-ASCII space characters).
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68 \end{funcdesc}
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69
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70 \begin{funcdesc}{in_table_c11_c12}{code}
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71 Determine whether \var{code} is in table{C.1}
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72 (Space characters, union of C.1.1 and C.1.2).
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73 \end{funcdesc}
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74
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75 \begin{funcdesc}{in_table_c21}{code}
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76 Determine whether \var{code} is in table{C.2.1}
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77 (ASCII control characters).
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78 \end{funcdesc}
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79
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80 \begin{funcdesc}{in_table_c22}{code}
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81 Determine whether \var{code} is in table{C.2.2}
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82 (Non-ASCII control characters).
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83 \end{funcdesc}
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84
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85 \begin{funcdesc}{in_table_c21_c22}{code}
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86 Determine whether \var{code} is in table{C.2}
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87 (Control characters, union of C.2.1 and C.2.2).
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88 \end{funcdesc}
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89
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90 \begin{funcdesc}{in_table_c3}{code}
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91 Determine whether \var{code} is in table{C.3}
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92 (Private use).
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93 \end{funcdesc}
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94
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95 \begin{funcdesc}{in_table_c4}{code}
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96 Determine whether \var{code} is in table{C.4}
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97 (Non-character code points).
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98 \end{funcdesc}
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99
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100 \begin{funcdesc}{in_table_c5}{code}
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101 Determine whether \var{code} is in table{C.5}
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102 (Surrogate codes).
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103 \end{funcdesc}
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104
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105 \begin{funcdesc}{in_table_c6}{code}
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106 Determine whether \var{code} is in table{C.6}
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107 (Inappropriate for plain text).
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108 \end{funcdesc}
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109
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110 \begin{funcdesc}{in_table_c7}{code}
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111 Determine whether \var{code} is in table{C.7}
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112 (Inappropriate for canonical representation).
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113 \end{funcdesc}
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114
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115 \begin{funcdesc}{in_table_c8}{code}
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116 Determine whether \var{code} is in table{C.8}
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117 (Change display properties or are deprecated).
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118 \end{funcdesc}
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119
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120 \begin{funcdesc}{in_table_c9}{code}
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121 Determine whether \var{code} is in table{C.9}
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122 (Tagging characters).
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123 \end{funcdesc}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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124
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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125 \begin{funcdesc}{in_table_d1}{code}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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126 Determine whether \var{code} is in table{D.1}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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127 (Characters with bidirectional property ``R'' or ``AL'').
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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128 \end{funcdesc}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
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129
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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130 \begin{funcdesc}{in_table_d2}{code}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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131 Determine whether \var{code} is in table{D.2}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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132 (Characters with bidirectional property ``L'').
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
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133 \end{funcdesc}
d41d8de9768f Implement IDNA (Internationalized Domain Names in Applications).
Martin v. Löwis <martin@v.loewis.de>
parents:
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134