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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef prerror_h___
+#define prerror_h___
+
+#include "prtypes.h"
+
+PR_BEGIN_EXTERN_C
+
+typedef PRInt32 PRErrorCode;
+
+#define PR_NSPR_ERROR_BASE -6000
+
+#include "prerr.h"
+
+/*
+** Set error will preserve an error condition within a thread context.
+** The values stored are the NSPR (platform independent) translation of
+** the error. Also, if available, the platform specific oserror is stored.
+** If there is no appropriate OS error number, a zero my be supplied.
+*/
+NSPR_API(void) PR_SetError(PRErrorCode errorCode, PRInt32 oserr);
+
+/*
+** The text value specified may be NULL. If it is not NULL and the text length
+** is zero, the string is assumed to be a null terminated C string. Otherwise
+** the text is assumed to be the length specified and possibly include NULL
+** characters (e.g., a multi-national string).
+**
+** The text will be copied into to thread structure and remain there
+** until the next call to PR_SetError.
+*/
+NSPR_API(void) PR_SetErrorText(
+ PRIntn textLength, const char *text);
+
+/*
+** Return the current threads last set error code.
+*/
+NSPR_API(PRErrorCode) PR_GetError(void);
+
+/*
+** Return the current threads last set os error code. This is used for
+** machine specific code that desires the underlying os error.
+*/
+NSPR_API(PRInt32) PR_GetOSError(void);
+
+/*
+** Get the length of the error text. If a zero is returned, then there
+** is no text. Otherwise, the value returned is sufficient to contain
+** the error text currently available.
+*/
+NSPR_API(PRInt32) PR_GetErrorTextLength(void);
+
+/*
+** Copy the current threads current error text. Then actual number of bytes
+** copied is returned as the result. If the result is zero, the 'text' area
+** is unaffected.
+*/
+NSPR_API(PRInt32) PR_GetErrorText(char *text);
+
+
+/*
+Copyright (C) 1987, 1988 Student Information Processing Board of the
+Massachusetts Institute of Technology.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted, provided
+that the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation, and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
+used in advertising or publicity pertaining to distribution of the software
+without specific, written prior permission. M.I.T. and the M.I.T. S.I.P.B.
+make no representations about the suitability of this software for any
+purpose. It is provided "as is" without express or implied warranty.
+*/
+
+
+/*
+ * NOTE:
+ * The interfaces for error-code-translation described in the rest of
+ * this file are preliminary in the 3.1 release of nspr and are subject
+ * to change in future releases.
+ */
+
+/*
+** Description: Localizable error code to string function.
+**
+**
+** NSPR provides a mechanism for converting an error code to a
+** descriptive string, in a caller-specified language.
+**
+** Error codes themselves are 32 bit (signed) integers. Typically,
+** the high order 24 bits are an identifier of which error table the
+** error code is from, and the low order 8 bits are a sequential error
+** number within the table. NSPR supports error tables whose first
+** error code is not a multiple of 256, such error code assignments
+** should be avoided when possible.
+**
+** Error table 0 is defined to match the UNIX system call error table
+** (sys_errlist); this allows errno values to be used directly in the
+** library. Other error table numbers are typically formed by
+** compacting together the first four characters of the error table
+** name. The mapping between characters in the name and numeric
+** values in the error code are defined in a system-independent
+** fashion, so that two systems that can pass integral values between
+** them can reliably pass error codes without loss of meaning; this
+** should work even if the character sets used are not the
+** same. (However, if this is to be done, error table 0 should be
+** avoided, since the local system call error tables may differ.)
+**
+** Libraries defining error codes need only provide a table mapping
+** error code numbers to names and default English descriptions,
+** calling a routine to install the table, making it ``known'' to NSPR
+** library. Once installed, a table may not be removed. Any error
+** code the library generates can be converted to the corresponding
+** error message. There is also a default format for error codes
+** accidentally returned before making the table known, which is of
+** the form "unknown code foo 32", where "foo" would be the name of
+** the table.
+**
+** Normally, the error code conversion routine only supports the
+** languages "i-default" and "en", returning the error-table-provided
+** English description for both languages. The application may
+** provide a localization plugin, allowing support for additional
+** languages.
+**
+**/
+
+/**********************************************************************/
+/************************* TYPES AND CONSTANTS ************************/
+/**********************************************************************/
+
+/*
+ * PRLanguageCode --
+ *
+ * NSPR represents a language code as a non-negative integer.
+ * Languages 0 is always "i-default" the language you get without
+ * explicit negotiation. Language 1 is always "en", English
+ * which has been explicitly negotiated. Additional language
+ * codes are defined by an application-provided localization plugin.
+ */
+typedef PRUint32 PRLanguageCode;
+#define PR_LANGUAGE_I_DEFAULT 0 /* i-default, the default language */
+#define PR_LANGUAGE_EN 1 /* English, explicitly negotiated */
+
+/*
+ * struct PRErrorMessage --
+ *
+ * An error message in an error table.
+ */
+struct PRErrorMessage {
+ const char * name; /* Macro name for error */
+ const char * en_text; /* Default English text */
+};
+
+/*
+ * struct PRErrorTable --
+ *
+ * An error table, provided by a library.
+ */
+struct PRErrorTable {
+ const struct PRErrorMessage * msgs; /* Array of error information */
+ const char *name; /* Name of error table source */
+ PRErrorCode base; /* Error code for first error in table */
+ int n_msgs; /* Number of codes in table */
+};
+
+/*
+ * struct PRErrorCallbackPrivate --
+ *
+ * A private structure for the localization plugin
+ */
+struct PRErrorCallbackPrivate;
+
+/*
+ * struct PRErrorCallbackTablePrivate --
+ *
+ * A data structure under which the localization plugin may store information,
+ * associated with an error table, that is private to itself.
+ */
+struct PRErrorCallbackTablePrivate;
+
+/*
+ * PRErrorCallbackLookupFn --
+ *
+ * A function of PRErrorCallbackLookupFn type is a localization
+ * plugin callback which converts an error code into a description
+ * in the requested language. The callback is provided the
+ * appropriate error table, private data for the plugin and the table.
+ * The callback returns the appropriate UTF-8 encoded description, or NULL
+ * if no description can be found.
+ */
+typedef const char *
+PRErrorCallbackLookupFn(PRErrorCode code, PRLanguageCode language,
+ const struct PRErrorTable *table,
+ struct PRErrorCallbackPrivate *cb_private,
+ struct PRErrorCallbackTablePrivate *table_private);
+
+/*
+ * PRErrorCallbackNewTableFn --
+ *
+ * A function PRErrorCallbackNewTableFn type is a localization plugin
+ * callback which is called once with each error table registered
+ * with NSPR. The callback is provided with the error table and
+ * the plugin's private structure. The callback returns any table private
+ * data it wishes to associate with the error table. Does not need to be thread
+ * safe.
+ */
+typedef struct PRErrorCallbackTablePrivate *
+PRErrorCallbackNewTableFn(const struct PRErrorTable *table,
+ struct PRErrorCallbackPrivate *cb_private);
+
+/**********************************************************************/
+/****************************** FUNCTIONS *****************************/
+/**********************************************************************/
+
+/***********************************************************************
+** FUNCTION: PR_ErrorToString
+** DESCRIPTION:
+** Returns the UTF-8 message for an error code in
+** the requested language. May return the message
+** in the default language if a translation in the requested
+** language is not available. The returned string is
+** valid for the duration of the process. Never returns NULL.
+**
+***********************************************************************/
+NSPR_API(const char *) PR_ErrorToString(PRErrorCode code,
+ PRLanguageCode language);
+
+
+/***********************************************************************
+** FUNCTION: PR_ErrorToName
+** DESCRIPTION:
+** Returns the macro name for an error code, or NULL
+** if the error code is not known. The returned string is
+** valid for the duration of the process.
+**
+** Does not work for error table 0, the system error codes.
+**
+***********************************************************************/
+NSPR_API(const char *) PR_ErrorToName(PRErrorCode code);
+
+
+/***********************************************************************
+** FUNCTION: PR_ErrorLanguages
+** DESCRIPTION:
+** Returns the RFC 1766 language tags for the language
+** codes PR_ErrorToString() supports. The returned array is valid
+** for the duration of the process. Never returns NULL. The first
+** item in the returned array is the language tag for PRLanguageCode 0,
+** the second is for PRLanguageCode 1, and so on. The array is terminated
+** with a null pointer.
+**
+***********************************************************************/
+NSPR_API(const char * const *) PR_ErrorLanguages(void);
+
+
+/***********************************************************************
+** FUNCTION: PR_ErrorInstallTable
+** DESCRIPTION:
+** Registers an error table with NSPR. Must be done exactly once per
+** table. Memory pointed to by `table' must remain valid for the life
+** of the process.
+**
+** NOT THREAD SAFE!
+**
+***********************************************************************/
+NSPR_API(PRErrorCode) PR_ErrorInstallTable(const struct PRErrorTable *table);
+
+
+/***********************************************************************
+** FUNCTION: PR_ErrorInstallCallback
+** DESCRIPTION:
+** Registers an error localization plugin with NSPR. May be called
+** at most one time. `languages' contains the language codes supported
+** by this plugin. Languages 0 and 1 must be "i-default" and "en"
+** respectively. `lookup' and `newtable' contain pointers to
+** the plugin callback functions. `cb_private' contains any information
+** private to the plugin functions.
+**
+** NOT THREAD SAFE!
+**
+***********************************************************************/
+NSPR_API(void) PR_ErrorInstallCallback(const char * const * languages,
+ PRErrorCallbackLookupFn *lookup,
+ PRErrorCallbackNewTableFn *newtable,
+ struct PRErrorCallbackPrivate *cb_private);
+
+PR_END_EXTERN_C
+
+#endif /* prerror_h___ */