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ShellPkg/redirection: Insert \xFEFF for ENV variable redirection

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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1080

Per Shell spec 2.2 chapter 3.4.4.2, Unicode file tag should be
inserted in the output from the input redirected variable, to ensure
it looks like a UCS-2 encode file.

The patch fixes this issue.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
This commit is contained in:
Ruiyu Ni 2018-08-09 11:43:24 +08:00
parent bc0d3e2912
commit 52047be024
1 changed files with 27 additions and 7 deletions
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24
ShellPkg/Application/Shell/FileHandleWrappers.c
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@ -1153,10 +1153,30 @@ FileInterfaceEnvRead(
OUT VOID *Buffer OUT VOID *Buffer
) )
{ {
return (SHELL_GET_ENVIRONMENT_VARIABLE( EFI_STATUS Status;
*BufferSize = *BufferSize / sizeof (CHAR16) * sizeof (CHAR16);
if (*BufferSize != 0) {
//
// Make sure the first unicode character is \xFEFF
//
*(CHAR16 *)Buffer = gUnicodeFileTag;
Buffer = (CHAR16 *)Buffer + 1;
*BufferSize -= sizeof (gUnicodeFileTag);
}
Status = SHELL_GET_ENVIRONMENT_VARIABLE (
((EFI_FILE_PROTOCOL_ENVIRONMENT*)This)->Name, ((EFI_FILE_PROTOCOL_ENVIRONMENT*)This)->Name,
BufferSize, BufferSize,
Buffer)); Buffer
);
if (!EFI_ERROR (Status) || (Status == EFI_BUFFER_TOO_SMALL)) {
//
// BufferSize is valid and needs update when Status is Success or BufferTooSmall.
//
*BufferSize += sizeof (gUnicodeFileTag);
}
return Status;
} }
/** /**