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