annotate nspr/pr/include/prerror.h @ 0:1e5118fa0cb1

This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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rev   line source
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef prerror_h___
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7 #define prerror_h___
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8
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9 #include "prtypes.h"
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10
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11 PR_BEGIN_EXTERN_C
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12
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13 typedef PRInt32 PRErrorCode;
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14
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15 #define PR_NSPR_ERROR_BASE -6000
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16
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17 #include "prerr.h"
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18
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19 /*
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20 ** Set error will preserve an error condition within a thread context.
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21 ** The values stored are the NSPR (platform independent) translation of
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22 ** the error. Also, if available, the platform specific oserror is stored.
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23 ** If there is no appropriate OS error number, a zero my be supplied.
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24 */
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25 NSPR_API(void) PR_SetError(PRErrorCode errorCode, PRInt32 oserr);
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26
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27 /*
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28 ** The text value specified may be NULL. If it is not NULL and the text length
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29 ** is zero, the string is assumed to be a null terminated C string. Otherwise
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30 ** the text is assumed to be the length specified and possibly include NULL
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31 ** characters (e.g., a multi-national string).
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32 **
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33 ** The text will be copied into to thread structure and remain there
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34 ** until the next call to PR_SetError.
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35 */
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36 NSPR_API(void) PR_SetErrorText(
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37 PRIntn textLength, const char *text);
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38
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39 /*
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40 ** Return the current threads last set error code.
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41 */
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42 NSPR_API(PRErrorCode) PR_GetError(void);
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43
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44 /*
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45 ** Return the current threads last set os error code. This is used for
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46 ** machine specific code that desires the underlying os error.
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47 */
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48 NSPR_API(PRInt32) PR_GetOSError(void);
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49
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50 /*
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51 ** Get the length of the error text. If a zero is returned, then there
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52 ** is no text. Otherwise, the value returned is sufficient to contain
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53 ** the error text currently available.
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54 */
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55 NSPR_API(PRInt32) PR_GetErrorTextLength(void);
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56
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57 /*
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58 ** Copy the current threads current error text. Then actual number of bytes
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59 ** copied is returned as the result. If the result is zero, the 'text' area
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60 ** is unaffected.
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61 */
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62 NSPR_API(PRInt32) PR_GetErrorText(char *text);
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63
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64
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65 /*
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66 Copyright (C) 1987, 1988 Student Information Processing Board of the
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67 Massachusetts Institute of Technology.
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68
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69 Permission to use, copy, modify, and distribute this software and its
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70 documentation for any purpose and without fee is hereby granted, provided
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71 that the above copyright notice appear in all copies and that both that
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72 copyright notice and this permission notice appear in supporting
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73 documentation, and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
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74 used in advertising or publicity pertaining to distribution of the software
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75 without specific, written prior permission. M.I.T. and the M.I.T. S.I.P.B.
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76 make no representations about the suitability of this software for any
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77 purpose. It is provided "as is" without express or implied warranty.
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78 */
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79
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80
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81 /*
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82 * NOTE:
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83 * The interfaces for error-code-translation described in the rest of
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84 * this file are preliminary in the 3.1 release of nspr and are subject
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85 * to change in future releases.
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86 */
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87
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88 /*
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89 ** Description: Localizable error code to string function.
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90 **
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91 **
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92 ** NSPR provides a mechanism for converting an error code to a
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93 ** descriptive string, in a caller-specified language.
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94 **
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95 ** Error codes themselves are 32 bit (signed) integers. Typically,
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96 ** the high order 24 bits are an identifier of which error table the
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97 ** error code is from, and the low order 8 bits are a sequential error
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98 ** number within the table. NSPR supports error tables whose first
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99 ** error code is not a multiple of 256, such error code assignments
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100 ** should be avoided when possible.
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101 **
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102 ** Error table 0 is defined to match the UNIX system call error table
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103 ** (sys_errlist); this allows errno values to be used directly in the
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104 ** library. Other error table numbers are typically formed by
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105 ** compacting together the first four characters of the error table
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106 ** name. The mapping between characters in the name and numeric
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107 ** values in the error code are defined in a system-independent
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108 ** fashion, so that two systems that can pass integral values between
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109 ** them can reliably pass error codes without loss of meaning; this
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110 ** should work even if the character sets used are not the
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111 ** same. (However, if this is to be done, error table 0 should be
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112 ** avoided, since the local system call error tables may differ.)
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113 **
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114 ** Libraries defining error codes need only provide a table mapping
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115 ** error code numbers to names and default English descriptions,
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116 ** calling a routine to install the table, making it ``known'' to NSPR
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117 ** library. Once installed, a table may not be removed. Any error
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118 ** code the library generates can be converted to the corresponding
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119 ** error message. There is also a default format for error codes
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120 ** accidentally returned before making the table known, which is of
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121 ** the form "unknown code foo 32", where "foo" would be the name of
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122 ** the table.
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123 **
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124 ** Normally, the error code conversion routine only supports the
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125 ** languages "i-default" and "en", returning the error-table-provided
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126 ** English description for both languages. The application may
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127 ** provide a localization plugin, allowing support for additional
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128 ** languages.
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129 **
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130 **/
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131
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132 /**********************************************************************/
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133 /************************* TYPES AND CONSTANTS ************************/
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134 /**********************************************************************/
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135
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136 /*
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137 * PRLanguageCode --
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138 *
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139 * NSPR represents a language code as a non-negative integer.
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140 * Languages 0 is always "i-default" the language you get without
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141 * explicit negotiation. Language 1 is always "en", English
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142 * which has been explicitly negotiated. Additional language
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143 * codes are defined by an application-provided localization plugin.
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144 */
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145 typedef PRUint32 PRLanguageCode;
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146 #define PR_LANGUAGE_I_DEFAULT 0 /* i-default, the default language */
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147 #define PR_LANGUAGE_EN 1 /* English, explicitly negotiated */
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148
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149 /*
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150 * struct PRErrorMessage --
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151 *
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152 * An error message in an error table.
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153 */
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154 struct PRErrorMessage {
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155 const char * name; /* Macro name for error */
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156 const char * en_text; /* Default English text */
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157 };
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158
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159 /*
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160 * struct PRErrorTable --
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161 *
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162 * An error table, provided by a library.
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163 */
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164 struct PRErrorTable {
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165 const struct PRErrorMessage * msgs; /* Array of error information */
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166 const char *name; /* Name of error table source */
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167 PRErrorCode base; /* Error code for first error in table */
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168 int n_msgs; /* Number of codes in table */
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169 };
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170
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171 /*
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172 * struct PRErrorCallbackPrivate --
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173 *
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174 * A private structure for the localization plugin
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175 */
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176 struct PRErrorCallbackPrivate;
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177
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178 /*
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179 * struct PRErrorCallbackTablePrivate --
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180 *
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181 * A data structure under which the localization plugin may store information,
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182 * associated with an error table, that is private to itself.
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183 */
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184 struct PRErrorCallbackTablePrivate;
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185
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186 /*
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187 * PRErrorCallbackLookupFn --
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188 *
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189 * A function of PRErrorCallbackLookupFn type is a localization
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190 * plugin callback which converts an error code into a description
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191 * in the requested language. The callback is provided the
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192 * appropriate error table, private data for the plugin and the table.
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193 * The callback returns the appropriate UTF-8 encoded description, or NULL
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194 * if no description can be found.
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195 */
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196 typedef const char *
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197 PRErrorCallbackLookupFn(PRErrorCode code, PRLanguageCode language,
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198 const struct PRErrorTable *table,
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199 struct PRErrorCallbackPrivate *cb_private,
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200 struct PRErrorCallbackTablePrivate *table_private);
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201
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202 /*
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203 * PRErrorCallbackNewTableFn --
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204 *
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205 * A function PRErrorCallbackNewTableFn type is a localization plugin
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206 * callback which is called once with each error table registered
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207 * with NSPR. The callback is provided with the error table and
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208 * the plugin's private structure. The callback returns any table private
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209 * data it wishes to associate with the error table. Does not need to be thread
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210 * safe.
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211 */
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212 typedef struct PRErrorCallbackTablePrivate *
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213 PRErrorCallbackNewTableFn(const struct PRErrorTable *table,
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214 struct PRErrorCallbackPrivate *cb_private);
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215
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216 /**********************************************************************/
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217 /****************************** FUNCTIONS *****************************/
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218 /**********************************************************************/
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219
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220 /***********************************************************************
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221 ** FUNCTION: PR_ErrorToString
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222 ** DESCRIPTION:
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223 ** Returns the UTF-8 message for an error code in
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224 ** the requested language. May return the message
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225 ** in the default language if a translation in the requested
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226 ** language is not available. The returned string is
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227 ** valid for the duration of the process. Never returns NULL.
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228 **
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229 ***********************************************************************/
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230 NSPR_API(const char *) PR_ErrorToString(PRErrorCode code,
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231 PRLanguageCode language);
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232
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233
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234 /***********************************************************************
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235 ** FUNCTION: PR_ErrorToName
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236 ** DESCRIPTION:
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237 ** Returns the macro name for an error code, or NULL
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238 ** if the error code is not known. The returned string is
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239 ** valid for the duration of the process.
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240 **
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241 ** Does not work for error table 0, the system error codes.
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242 **
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243 ***********************************************************************/
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244 NSPR_API(const char *) PR_ErrorToName(PRErrorCode code);
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245
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246
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247 /***********************************************************************
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248 ** FUNCTION: PR_ErrorLanguages
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249 ** DESCRIPTION:
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250 ** Returns the RFC 1766 language tags for the language
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251 ** codes PR_ErrorToString() supports. The returned array is valid
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252 ** for the duration of the process. Never returns NULL. The first
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253 ** item in the returned array is the language tag for PRLanguageCode 0,
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254 ** the second is for PRLanguageCode 1, and so on. The array is terminated
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255 ** with a null pointer.
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256 **
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257 ***********************************************************************/
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258 NSPR_API(const char * const *) PR_ErrorLanguages(void);
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259
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260
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261 /***********************************************************************
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262 ** FUNCTION: PR_ErrorInstallTable
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263 ** DESCRIPTION:
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264 ** Registers an error table with NSPR. Must be done exactly once per
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265 ** table. Memory pointed to by `table' must remain valid for the life
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266 ** of the process.
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267 **
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268 ** NOT THREAD SAFE!
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269 **
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270 ***********************************************************************/
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271 NSPR_API(PRErrorCode) PR_ErrorInstallTable(const struct PRErrorTable *table);
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272
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273
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274 /***********************************************************************
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275 ** FUNCTION: PR_ErrorInstallCallback
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276 ** DESCRIPTION:
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277 ** Registers an error localization plugin with NSPR. May be called
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278 ** at most one time. `languages' contains the language codes supported
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279 ** by this plugin. Languages 0 and 1 must be "i-default" and "en"
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280 ** respectively. `lookup' and `newtable' contain pointers to
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281 ** the plugin callback functions. `cb_private' contains any information
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282 ** private to the plugin functions.
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283 **
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284 ** NOT THREAD SAFE!
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285 **
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286 ***********************************************************************/
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287 NSPR_API(void) PR_ErrorInstallCallback(const char * const * languages,
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288 PRErrorCallbackLookupFn *lookup,
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289 PRErrorCallbackNewTableFn *newtable,
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290 struct PRErrorCallbackPrivate *cb_private);
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291
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292 PR_END_EXTERN_C
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293
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294 #endif /* prerror_h___ */
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