154 lines
2.9 KiB
C
154 lines
2.9 KiB
C
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/*++
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Copyright (c) 1998 Intel Corporation
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Module Name:
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io.c
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Abstract:
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Intialize the shell library
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Revision History
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--*/
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#include "shelllib.h"
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CHAR16 *
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ShellGetEnv (
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IN CHAR16 *Name
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)
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{
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return SE->GetEnv (Name);
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}
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CHAR16 *
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ShellGetMap (
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IN CHAR16 *Name
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)
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{
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return SE->GetMap (Name);
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}
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CHAR16 *
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ShellCurDir (
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IN CHAR16 *DeviceName OPTIONAL
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)
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/* N.B. Results are allocated from pool. The caller must free the pool */
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{
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return SE->CurDir (DeviceName);
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}
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EFI_STATUS
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ShellFileMetaArg (
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IN CHAR16 *Arg,
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IN OUT LIST_ENTRY *ListHead
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)
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{
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return SE->FileMetaArg(Arg, ListHead);
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}
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EFI_STATUS
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ShellFreeFileList (
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IN OUT LIST_ENTRY *ListHead
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)
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{
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return SE->FreeFileList(ListHead);
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}
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EFI_FILE_HANDLE
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ShellOpenFilePath (
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IN EFI_DEVICE_PATH *FilePath,
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IN UINT64 FileMode
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)
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{
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EFI_HANDLE DeviceHandle;
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EFI_STATUS Status;
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EFI_FILE_HANDLE FileHandle, LastHandle;
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FILEPATH_DEVICE_PATH *FilePathNode;
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/*
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* File the file system for this file path
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*/
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Status = BS->LocateDevicePath (&FileSystemProtocol, &FilePath, &DeviceHandle);
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if (EFI_ERROR(Status)) {
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return NULL;
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}
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/*
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* Attempt to access the file via a file system interface
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*/
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FileHandle = LibOpenRoot (DeviceHandle);
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Status = FileHandle ? EFI_SUCCESS : EFI_UNSUPPORTED;
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/*
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* To access as a filesystem, the filepath should only
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* contain filepath components. Follow the filepath nodes
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* and find the target file
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*/
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FilePathNode = (FILEPATH_DEVICE_PATH *) FilePath;
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while (!IsDevicePathEnd(&FilePathNode->Header)) {
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/*
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* For filesystem access each node should be a filepath component
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*/
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if (DevicePathType(&FilePathNode->Header) != MEDIA_DEVICE_PATH ||
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DevicePathSubType(&FilePathNode->Header) != MEDIA_FILEPATH_DP) {
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Status = EFI_UNSUPPORTED;
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}
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/*
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* If there's been an error, stop
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*/
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if (EFI_ERROR(Status)) {
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break;
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}
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/*
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* Open this file path node
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*/
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LastHandle = FileHandle;
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FileHandle = NULL;
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Status = LastHandle->Open (
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LastHandle,
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&FileHandle,
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FilePathNode->PathName,
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FileMode,
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0
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);
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/*
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* Close the last node
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*/
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LastHandle->Close (LastHandle);
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/*
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* Get the next node
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*/
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FilePathNode = (FILEPATH_DEVICE_PATH *) NextDevicePathNode(&FilePathNode->Header);
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}
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if (EFI_ERROR(Status)) {
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FileHandle = NULL;
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}
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return FileHandle;
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}
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