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Add GetVariabe(), GetEfiGlobalVariable() and GetBestLanguage() to UefiLib. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7936 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
qhuang8 2009-03-24 14:18:13 +00:00
parent 941199475d
commit 6d28c49754
4 changed files with 328 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

98
MdePkg/Include/Library/UefiLib.h
View File

@ -619,6 +619,104 @@ FreeUnicodeStringTable (
IN EFI_UNICODE_STRING_TABLE *UnicodeStringTable IN EFI_UNICODE_STRING_TABLE *UnicodeStringTable
); );
/**
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). The
returned buffer is allocated using AllocatePool(). The caller is responsible
for freeing this buffer with FreePool().
If Name is NULL, then ASSERT().
If Guid is NULL, then ASSERT().
@param[in] Name Pointer to a Null-terminated Unicode string.
@param[in] Guid Pointer to an EFI_GUID structure
@retval NULL The variable could not be retrieved.
@retval NULL There are not enough resources available for the variable contents.
@retval Other A pointer to allocated buffer containing the variable contents.
**/
VOID *
EFIAPI
GetVariable (
IN CONST CHAR16 *Name,
IN CONST EFI_GUID *Guid
);
/**
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). This
function always uses the EFI_GLOBAL_VARIABLE GUID to retrieve variables.
The returned buffer is allocated using AllocatePool(). The caller is
responsible for freeing this buffer with FreePool().
If Name is NULL, then ASSERT().
@param[in] Name Pointer to a Null-terminated Unicode string.
@retval NULL The variable could not be retrieved.
@retval NULL There are not enough resources available for the variable contents.
@retval Other A pointer to allocated buffer containing the variable contents.
**/
VOID *
EFIAPI
GetEfiGlobalVariable (
IN CONST CHAR16 *Name
);
/**
Returns a pointer to an allocated buffer that contains the best matching language
from a set of supported languages.
This function supports both ISO 639-2 and RFC 4646 language codes, but language
code types may not be mixed in a single call to this function. The language
code returned is allocated using AllocatePool(). The caller is responsible for
freeing the allocated buffer using FreePool(). This function supports a variable
argument list that allows the caller to pass in a prioritized list of language
codes to test against all the language codes in SupportedLanguages.
If SupportedLanguages is NULL, then ASSERT().
@param[in] SupportedLanguages A pointer to a Null-terminated ASCII string that
contains a set of language codes in the format
specified by Iso639Language.
@param[in] Iso639Language If TRUE, then all language codes are assumed to be
in ISO 639-2 format. If FALSE, then all language
codes are assumed to be in RFC 4646 language format
@param[in] ... A variable argument list that contains pointers to
Null-terminated ASCII strings that contain one or more
language codes in the format specified by Iso639Language.
The first language code from each of these language
code lists is used to determine if it is an exact or
close match to any of the language codes in
SupportedLanguages. Close matches only apply to RFC 4646
language codes, and the matching algorithm from RFC 4647
is used to determine if a close match is present. If
an exact or close match is found, then the matching
language code from SupportedLanguages is returned. If
no matches are found, then the next variable argument
parameter is evaluated. The variable argument list
is terminated by a NULL.
@retval NULL The best matching language could not be found in SupportedLanguages.
@retval NULL There are not enough resources available to return the best matching
language.
@retval Other A pointer to a Null-terminated ASCII string that is the best matching
language in SupportedLanguages.
**/
CHAR8 *
EFIAPI
GetBestLanguage (
IN CONST CHAR8 *SupportedLanguages,
IN BOOLEAN Iso639Language,
...
);
/** /**
Retrieves the width of a Unicode character. Retrieves the width of a Unicode character.

227
MdePkg/Library/UefiLib/UefiLib.c
View File

@ -145,7 +145,7 @@ EfiCreateProtocolNotifyEvent(
ASSERT_EFI_ERROR (Status); ASSERT_EFI_ERROR (Status);
// //
// Register for protocol notifactions on this event // Register for protocol notifications on this event
// //
Status = gBS->RegisterProtocolNotify ( Status = gBS->RegisterProtocolNotify (
@ -1189,3 +1189,228 @@ FreeUnicodeStringTable (
return EFI_SUCCESS; return EFI_SUCCESS;
} }
/**
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). The
returned buffer is allocated using AllocatePool(). The caller is responsible
for freeing tis buffer with FreePool().
If Name is NULL, then ASSERT().
If Guid is NULL, then ASSERT().
@param[in] Name Pointer to a Null-terminated Unicode string.
@param[in] Guid Pointer to an EFI_GUID structure
@retval NULL The variable could not be retrieved.
@retval Other A pointer to allocated buffer containing the variable contents
**/
VOID *
EFIAPI
GetVariable (
IN CONST CHAR16 *Name,
IN CONST EFI_GUID *Guid
)
{
EFI_STATUS Status;
UINTN Size;
VOID *Value;
ASSERT (Name != NULL);
ASSERT (Guid != NULL);
//
// Try to get the variable size.
//
Value = NULL;
Size = 0;
Status = gRT->GetVariable ((CHAR16 *) Name, (EFI_GUID *) Guid, NULL, &Size, Value);
if (Status != EFI_BUFFER_TOO_SMALL) {
return NULL;
}
//
// Allocate buffer to get the variable.
//
Value = AllocatePool (Size);
if (Value == NULL) {
return NULL;
}
//
// Get the variable data.
//
Status = gRT->GetVariable ((CHAR16 *) Name, (EFI_GUID *) Guid, NULL, &Size, Value);
if (EFI_ERROR (Status)) {
FreePool(Value);
return NULL;
}
return Value;
}
/**
Returns a pointer to an allocated buffer that contains the contents of a
variable retrieved through the UEFI Runtime Service GetVariable(). This
function always uses the EFI_GLOBAL_VARIABLE GUID to retrieve variables.
The returned buffer is allocated using AllocatePool(). The caller is
responsible for freeing this buffer with FreePool().
If Name is NULL, then ASSERT().
@param[in] Name Pointer to a Null-terminated Unicode string.
@retval NULL The variable could not be retrieved.
@retval NULL There are not enough resources available for the variable contents.
@retval Other A pointer to allocated buffer containing the variable contents.
**/
VOID *
EFIAPI
GetEfiGlobalVariable (
IN CONST CHAR16 *Name
)
{
return GetVariable (Name, &gEfiGlobalVariableGuid);
}
/**
Returns a pointer to an allocated buffer that contains the best matching language
from a set of supported languages.
This function supports both ISO 639-2 and RFC 4646 language codes, but language
code types may not be mixed in a single call to this function. The language
code returned is allocated using AllocatePool(). The caller is responsible for
freeing the allocated buffer using FreePool(). This function supports a variable
argument list that allows the caller to pass in a prioritized list of language
codes to test against all the language codes in SupportedLanguages.
If SupportedLanguages is NULL, then ASSERT().
@param[in] SupportedLanguages A pointer to a Null-terminated ASCII string that
contains a set of language codes in the format
specified by Iso639Language.
@param[in] Iso639Language If TRUE, then all language codes are assumed to be
in ISO 639-2 format. If FALSE, then all language
codes are assumed to be in RFC 4646 language format
@param[in] ... A variable argument list that contains pointers to
Null-terminated ASCII strings that contain one or more
language codes in the format specified by Iso639Language.
The first language code from each of these language
code lists is used to determine if it is an exact or
close match to any of the language codes in
SupportedLanguages. Close matches only apply to RFC 4646
language codes, and the matching algorithm from RFC 4647
is used to determine if a close match is present. If
an exact or close match is found, then the matching
language code from SupportedLanguages is returned. If
no matches are found, then the next variable argument
parameter is evaluated. The variable argument list
is terminated by a NULL.
@retval NULL The best matching language could not be found in SupportedLanguages.
@retval NULL There are not enough resources available to return the best matching
language.
@retval Other A pointer to a Null-terminated ASCII string that is the best matching
language in SupportedLanguages.
**/
CHAR8 *
EFIAPI
GetBestLanguage (
IN CONST CHAR8 *SupportedLanguages,
IN BOOLEAN Iso639Language,
...
)
{
VA_LIST Args;
CHAR8 *Language;
UINTN CompareLength;
UINTN LanguageLength;
CONST CHAR8 *Supported;
CHAR8 *BestLanguage;
ASSERT (SupportedLanguages != NULL);
VA_START (Args, Iso639Language);
while ((Language = VA_ARG (Args, CHAR8 *)) != NULL) {
//
// Default to ISO 639-2 mode
//
CompareLength = 3;
LanguageLength = MIN (3, AsciiStrLen (Language));
//
// If in RFC 4646 mode, then determine the length of the first RFC 4646 language code in Language
//
if (!Iso639Language) {
for (LanguageLength = 0; Language[LanguageLength] != 0 && Language[LanguageLength] != ';'; LanguageLength++);
}
//
// Trim back the length of Language used until it is empty
//
while (LanguageLength > 0) {
//
// Loop through all language codes in SupportedLanguages
//
for (Supported = SupportedLanguages; *Supported != '\0'; Supported += CompareLength) {
//
// In RFC 4646 mode, then Loop through all language codes in SupportedLanguages
//
if (!Iso639Language) {
//
// Skip ';' characters in Supported
//
for (; *Supported != '\0' && *Supported == ';'; Supported++);
//
// Determine the length of the next language code in Supported
//
for (CompareLength = 0; Supported[CompareLength] != 0 && Supported[CompareLength] != ';'; CompareLength++);
//
// If Language is longer than the Supported, then skip to the next language
//
if (LanguageLength > CompareLength) {
continue;
}
}
//
// See if the first LanguageLength characters in Supported match Language
//
if (AsciiStrnCmp (Supported, Language, LanguageLength) == 0) {
VA_END (Args);
//
// Allocate, copy, and return the best matching language code from SupportedLanguages
//
BestLanguage = AllocateZeroPool (CompareLength + 1);
if (BestLanguage == NULL) {
return NULL;
}
return CopyMem (BestLanguage, Supported, CompareLength);
}
}
if (Iso639Language) {
//
// If ISO 639 mode, then each language can only be tested once
//
LanguageLength = 0;
} else {
//
// If RFC 4646 mode, then trim Language from the right to the next '-' character
//
for (LanguageLength--; LanguageLength > 0 && Language[LanguageLength] != '-'; LanguageLength--);
}
}
}
VA_END (Args);
//
// No matches were found
//
return NULL;
}

3
MdePkg/Library/UefiLib/UefiLib.inf
View File

@ -54,11 +54,12 @@
BaseLib BaseLib
UefiBootServicesTableLib UefiBootServicesTableLib
DevicePathLib DevicePathLib
UefiRuntimeServicesTableLib
[Guids] [Guids]
gEfiEventReadyToBootGuid ## CONSUMES ## Event gEfiEventReadyToBootGuid ## CONSUMES ## Event
gEfiEventLegacyBootGuid ## CONSUMES ## Event gEfiEventLegacyBootGuid ## CONSUMES ## Event
gEfiGlobalVariableGuid ## CONSUMES ## Variable
[Protocols] [Protocols]
gEfiDriverBindingProtocolGuid ## PRODUCES gEfiDriverBindingProtocolGuid ## PRODUCES

2
MdePkg/Library/UefiLib/UefiLibInternal.h
View File

@ -29,8 +29,10 @@
#include <Guid/EventGroup.h> #include <Guid/EventGroup.h>
#include <Guid/EventLegacyBios.h> #include <Guid/EventLegacyBios.h>
#include <Guid/GlobalVariable.h>
#include <Library/UefiLib.h> #include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h> #include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/BaseLib.h> #include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h> #include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h> #include <Library/DebugLib.h>