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/** @file
Language settings
Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Bds.h"
#define ISO_639_2_ENTRY_SIZE 3
/**
Check if lang is in supported language codes according to language string.
This code is used to check if lang is in in supported language codes. It can handle
RFC4646 and ISO639 language tags.
In ISO639 language tags, take 3-characters as a delimitation to find matched string.
In RFC4646 language tags, take semicolon as a delimitation to find matched string.
For example:
SupportedLang = "engfraengfra"
Iso639Language = TRUE
Lang = "eng", the return value is "TRUE", or
Lang = "chs", the return value is "FALSE".
Another example:
SupportedLang = "en;fr;en-US;fr-FR"
Iso639Language = FALSE
Lang = "en", the return value is "TRUE", or
Lang = "zh", the return value is "FALSE".
@param SupportedLang Platform supported language codes.
@param Lang Configured language.
@param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
@retval TRUE lang is in supported language codes.
@retval FALSE lang is not in supported language codes.
**/
BOOLEAN
IsLangInSupportedLangCodes (
IN CHAR8 *SupportedLang,
IN CHAR8 *Lang,
IN BOOLEAN Iso639Language
)
{
UINTN Index;
UINTN CompareLength;
UINTN LanguageLength;
if (Iso639Language) {
CompareLength = ISO_639_2_ENTRY_SIZE;
for (Index = 0; Index < AsciiStrLen (SupportedLang); Index += CompareLength) {
if (AsciiStrnCmp (Lang, SupportedLang + Index, CompareLength) == 0) {
//
// Successfully find the Lang string in SupportedLang string.
//
return TRUE;
}
}
return FALSE;
} else {
//
// Compare RFC4646 language code
//
for (LanguageLength = 0; Lang[LanguageLength] != '\0'; LanguageLength++) {
}
for ( ; *SupportedLang != '\0'; SupportedLang += CompareLength) {
//
// Skip ';' characters in SupportedLang
//
for ( ; *SupportedLang != '\0' && *SupportedLang == ';'; SupportedLang++) {
}
//
// Determine the length of the next language code in SupportedLang
//
for (CompareLength = 0; SupportedLang[CompareLength] != '\0' && SupportedLang[CompareLength] != ';'; CompareLength++) {
}
if ((CompareLength == LanguageLength) &&
(AsciiStrnCmp (Lang, SupportedLang, CompareLength) == 0))
{
//
// Successfully find the Lang string in SupportedLang string.
//
return TRUE;
}
}
return FALSE;
}
}
/**
Initialize Lang or PlatformLang variable, if Lang or PlatformLang variable is not found,
or it has been set to an unsupported value(not one of platform supported language codes),
set the default language code to it.
@param LangName Language name, L"Lang" or L"PlatformLang".
@param SupportedLang Platform supported language codes.
@param DefaultLang Default language code.
@param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646,
TRUE for L"Lang" LangName or FALSE for L"PlatformLang" LangName.
**/
VOID
InitializeLangVariable (
IN CHAR16 *LangName,
IN CHAR8 *SupportedLang,
IN CHAR8 *DefaultLang,
IN BOOLEAN Iso639Language
)
{
CHAR8 *Lang;
//
// Find current Lang or PlatformLang from EFI Variable.
//
GetEfiGlobalVariable2 (LangName, (VOID **)&Lang, NULL);
//
// If Lang or PlatformLang variable is not found,
// or it has been set to an unsupported value(not one of the supported language codes),
// set the default language code to it.
//
if ((Lang == NULL) || !IsLangInSupportedLangCodes (SupportedLang, Lang, Iso639Language)) {
//
// The default language code should be one of the supported language codes.
//
ASSERT (IsLangInSupportedLangCodes (SupportedLang, DefaultLang, Iso639Language));
BdsDxeSetVariableAndReportStatusCodeOnError (
LangName,
&gEfiGlobalVariableGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
AsciiStrSize (DefaultLang),
DefaultLang
);
}
if (Lang != NULL) {
FreePool (Lang);
}
}
/**
Determine the current language that will be used
based on language related EFI Variables.
@param LangCodesSettingRequired - If required to set LangCodes variable
**/
VOID
InitializeLanguage (
BOOLEAN LangCodesSettingRequired
)
{
EFI_STATUS Status;
CHAR8 *LangCodes;
CHAR8 *PlatformLangCodes;
LangCodes = (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultLangCodes);
PlatformLangCodes = (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultPlatformLangCodes);
if (LangCodesSettingRequired) {
if (!FeaturePcdGet (PcdUefiVariableDefaultLangDeprecate)) {
//
// UEFI 2.1 depricated this variable so we support turning it off
//
Status = gRT->SetVariable (
L"LangCodes",
&gEfiGlobalVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
AsciiStrSize (LangCodes),
LangCodes
);
//
// Platform needs to make sure setting volatile variable before calling 3rd party code shouldn't fail.
//
ASSERT_EFI_ERROR (Status);
}
Status = gRT->SetVariable (
L"PlatformLangCodes",
&gEfiGlobalVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
AsciiStrSize (PlatformLangCodes),
PlatformLangCodes
);
//
// Platform needs to make sure setting volatile variable before calling 3rd party code shouldn't fail.
//
ASSERT_EFI_ERROR (Status);
}
if (!FeaturePcdGet (PcdUefiVariableDefaultLangDeprecate)) {
//
// UEFI 2.1 depricated this variable so we support turning it off
//
InitializeLangVariable (L"Lang", LangCodes, (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultLang), TRUE);
}
InitializeLangVariable (L"PlatformLang", PlatformLangCodes, (CHAR8 *)PcdGetPtr (PcdUefiVariableDefaultPlatformLang), FALSE);
}
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