ShellPkg: Move FindFirstCharacter/GetNextParameter to ShellCommandLib

And add Shell prefix to the two library APIs.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

ShellPkg/Include/Library/ShellCommandLib.h

@@ -719,4 +719,49 @@ CatSDumpHex (
   IN UINTN   DataSize,
   IN VOID    *UserData
   );
+
+/**
+  Return the pointer to the first occurrence of any character from a list of characters.
+
+  @param[in] String                 The string to parse
+  @param[in] CharacterList          The list of character to look for
+  @param[in] IgnoreEscapedCharacter TRUE to ignore escaped characters
+
+  @return The location of the first character in the String.
+  @return Pointer to the ending NULL character of the String.
+**/
+CONST CHAR16*
+EFIAPI
+ShellFindFirstCharacter (
+  IN CONST CHAR16  *String,
+  IN CONST CHAR16  *CharacterList,
+  IN CONST BOOLEAN IgnoreEscapedCharacter
+  );
+
+/**
+  return the next parameter from a command line string;
+
+  This function moves the next parameter from Walker into NextParameter and moves
+  Walker up past that parameter for recursive calling.  When the final parameter
+  is moved *Walker will be set to NULL;
+
+  @param[in, out] Walker          pointer to string of command line.  Adjusted to
+                                  reminaing command line on return
+  @param[in, out] NextParameter   string of command line item extracted.
+  @param[in]      Length          Length of TempParameter in bytes
+  @param[in]      StripQuotation  if TRUE then strip the quotation marks surrounding
+                                  the parameters.
+
+  @return   EFI_INALID_PARAMETER  A required parameter was NULL or pointed to a NULL or empty string.
+  @return   EFI_NOT_FOUND         A closing " could not be found on the specified string
+**/
+EFI_STATUS
+EFIAPI
+ShellGetNextParameter(
+  IN OUT CHAR16   **Walker,
+  IN OUT CHAR16   *NextParameter,
+  IN CONST UINTN  Length,
+  IN BOOLEAN      StripQuotation
+  );
+
 #endif //_SHELL_COMMAND_LIB_