ShellPkg/Library/UefiShellDebug1CommandsLib/SmbiosView/Smbios.c

   1 /** @file
   2   Lib fucntions for SMBIOS. Used to get system serial number and GUID
   3
   4   Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "../UefiShellDebug1CommandsLib.h"
  16 #include <Guid/SmBios.h>
  17 #include "LibSmbios.h"
  18
  19 /**
  20   Return SMBIOS string given the string number.
  21
  22   @param[in] Smbios         Pointer to SMBIOS structure.
  23   @param[in] StringNumber   String number to return. -1 is used to skip all strings and
  24                             point to the next SMBIOS structure.
  25
  26   @return Pointer to string, or pointer to next SMBIOS strcuture if StringNumber == -1
  27 **/
  28 CHAR8*
  29 LibGetSmbiosString (
  30   IN  SMBIOS_STRUCTURE_POINTER    *Smbios,
  31   IN  UINT16                      StringNumber
  32   )
  33 {
  34   UINT16  Index;
  35   CHAR8   *String;
  36
  37   ASSERT (Smbios != NULL);
  38
  39   //
  40   // Skip over formatted section
  41   //
  42   String = (CHAR8 *) (Smbios->Raw + Smbios->Hdr->Length);
  43
  44   //
  45   // Look through unformated section
  46   //
  47   for (Index = 1; Index <= StringNumber; Index++) {
  48     if (StringNumber == Index) {
  49       return String;
  50     }
  51     //
  52     // Skip string
  53     //
  54     for (; *String != 0; String++);
  55     String++;
  56
  57     if (*String == 0) {
  58       //
  59       // If double NULL then we are done.
  60       //  Retrun pointer to next structure in Smbios.
  61       //  if you pass in a -1 you will always get here
  62       //
  63       Smbios->Raw = (UINT8 *)++String;
  64       return NULL;
  65     }
  66   }
  67
  68   return NULL;
  69 }