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From: Tim Lewis <tim.lewis@insyde.com>
To: "edk2-devel@lists.01.org" <edk2-devel@lists.01.org>
Thread-Topic: Root Cause of Parse Failure With Redirected Input
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Date: Fri, 2 Dec 2016 02:07:54 +0000
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Subject: Root Cause of Parse Failure With Redirected Input
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      if (StrStr (TempLine, L"ShellCommand,") =3D=3D TempLine) {
        LoopVariable++;
      }

This line fails because, with redirected input, the file has the UCS-2 byte=
 order mark, so the string "ShellCommand," is not at the beginning of the l=
ine. With the file, the byte order mark is not present.

Why?

     if (StreamingUnicode) {
       TempLine =3D ParseReturnStdInLine (FileHandle);
     } else {
       TempLine =3D ShellFileHandleReturnLine (FileHandle, &Ascii);
     }

The Shell library function ShellFileHandleReturnLine will strip off the byt=
e order mark. But the ParseReturnStdInLine does not. So the first character=
 on the line is not 'S', it is the byte order mark.

Tim