[PATCH] ShellPkg/Touch: Create file if it doesn't exist

[Jeff Westfahl <jeff.westfahl@ni.com>]

The UEFI Shell touch command returns an error if a file to be touched
doesn't exist. In other command line operating environments, the touch
command typically creates a file if it doesn't exist. This patch updates
the UEFI Shell touch command to follow this convention.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
---
 ShellPkg/Library/UefiShellLevel3CommandsLib/Touch.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/ShellPkg/Library/UefiShellLevel3CommandsLib/Touch.c b/ShellPkg/Library/UefiShellLevel3CommandsLib/Touch.c
index 639346f..921de5a 100644
--- a/ShellPkg/Library/UefiShellLevel3CommandsLib/Touch.c
+++ b/ShellPkg/Library/UefiShellLevel3CommandsLib/Touch.c
@@ -175,11 +175,13 @@ ShellCommandRunTouch (
   UINTN               ParamCount;
   EFI_SHELL_FILE_INFO *FileList;
   EFI_SHELL_FILE_INFO *Node;
+  SHELL_FILE_HANDLE   FileHandle;
 
   ProblemParam        = NULL;
   ShellStatus         = SHELL_SUCCESS;
   ParamCount          = 0;
   FileList            = NULL;
+  FileHandle          = NULL;
 
   //
   // initialize the shell lib (we must be in non-auto-init...)
@@ -226,9 +228,17 @@ ShellCommandRunTouch (
          ){
         Status = ShellOpenFileMetaArg((CHAR16*)Param, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE, &FileList);
         if (EFI_ERROR(Status)) {
-          ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PARAM_INV), gShellLevel3HiiHandle, L"touch", (CHAR16*)Param);  
-          ShellStatus = SHELL_NOT_FOUND;
-          break;
+          //
+          // try to create the file in case it doesn't exist
+          //
+          gEfiShellProtocol->CreateFile(Param, 0, &FileHandle);
+          gEfiShellProtocol->CloseFile(FileHandle);
+          Status = ShellOpenFileMetaArg((CHAR16*)Param, EFI_FILE_MODE_READ|EFI_FILE_MODE_WRITE, &FileList);
+          if (EFI_ERROR(Status)) {
+            ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PARAM_INV), gShellLevel3HiiHandle, L"touch", (CHAR16*)Param);
+            ShellStatus = SHELL_NOT_FOUND;
+            break;
+          }
         }
         //
         // make sure we completed the param parsing sucessfully...
-- 
2.7.4