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| -rw-r--r-- | nsprpub/pr/include/prerror.h | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/nsprpub/pr/include/prerror.h b/nsprpub/pr/include/prerror.h new file mode 100644 index 0000000000..f445aa90aa --- /dev/null +++ b/nsprpub/pr/include/prerror.h @@ -0,0 +1,294 @@ +/* -*- 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___ */ |