UefiShellCEntryLib.c

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#include <Base.h>
 
#include <Protocol/SimpleFileSystem.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/EfiShellInterface.h>
#include <Protocol/ShellParameters.h>
 
#include <Library/ShellCEntryLib.h>
#include <Library/DebugLib.h>
 
EFI_STATUS
EFIAPI
ShellCEntryLib (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  INTN                           ReturnFromMain;
  EFI_SHELL_PARAMETERS_PROTOCOL  *EfiShellParametersProtocol;
  EFI_SHELL_INTERFACE            *EfiShellInterface;
  EFI_STATUS                     Status;
 
  ReturnFromMain             = -1;
  EfiShellParametersProtocol = NULL;
  EfiShellInterface          = NULL;
 
  Status = SystemTable->BootServices->OpenProtocol (
                                        ImageHandle,
                                        &gEfiShellParametersProtocolGuid,
                                        (VOID **)&EfiShellParametersProtocol,
                                        ImageHandle,
                                        NULL,
                                        EFI_OPEN_PROTOCOL_GET_PROTOCOL
                                        );
  if (!EFI_ERROR (Status)) {
    //
    // use shell 2.0 interface
    //
    ReturnFromMain = ShellAppMain (
                       EfiShellParametersProtocol->Argc,
                       EfiShellParametersProtocol->Argv
                       );
  } else {
    //
    // try to get shell 1.0 interface instead.
    //
    Status = SystemTable->BootServices->OpenProtocol (
                                          ImageHandle,
                                          &gEfiShellInterfaceGuid,
                                          (VOID **)&EfiShellInterface,
                                          ImageHandle,
                                          NULL,
                                          EFI_OPEN_PROTOCOL_GET_PROTOCOL
                                          );
    if (!EFI_ERROR (Status)) {
      //
      // use shell 1.0 interface
      //
      ReturnFromMain = ShellAppMain (
                         EfiShellInterface->Argc,
                         EfiShellInterface->Argv
                         );
    } else {
      ASSERT (FALSE);
    }
  }
 
  return ReturnFromMain;
}