C++ AsciiStrLen函数代码示例

/**

  Prints an assert message containing a filename, line number, and description.  
  This may be followed by a breakpoint or a dead loop.

  Print a message of the form "ASSERT <FileName>(<LineNumber>): <Description>\n" 
  to the debug output device.  If DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED bit of 
  PcdDebugProperyMask is set then CpuBreakpoint() is called. Otherwise, if 
  DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED bit of PcdDebugProperyMask is set then 
  CpuDeadLoop() is called.  If neither of these bits are set, then this function 
  returns immediately after the message is printed to the debug output device.
  DebugAssert() must actively prevent recusrsion.  If DebugAssert() is called while
  processing another DebugAssert(), then DebugAssert() must return immediately.

  If FileName is NULL, then a <FileName> string of "(NULL) Filename" is printed.

  If Description is NULL, then a <Description> string of "(NULL) Description" is printed.

  @param  FileName     Pointer to the name of the source file that generated the assert condition.
  @param  LineNumber   The line number in the source file that generated the assert condition
  @param  Description  Pointer to the description of the assert condition.

**/
VOID
EFIAPI
DebugAssert (
  IN CONST CHAR8  *FileName,
  IN UINTN        LineNumber,
  IN CONST CHAR8  *Description
  )
{
  UINT64                 Buffer[EFI_STATUS_CODE_DATA_MAX_SIZE / sizeof(UINT64)];
  EFI_DEBUG_ASSERT_DATA  *AssertData;
  UINTN                  TotalSize;
  CHAR8                  *Temp;
  UINTN                  FileNameLength;
  UINTN                  DescriptionLength;

  //
  // Make sure it will all fit in the passed in buffer
  //
  FileNameLength    = AsciiStrLen (FileName);
  DescriptionLength = AsciiStrLen (Description);
  TotalSize = sizeof (EFI_DEBUG_ASSERT_DATA) + FileNameLength + 1 + DescriptionLength + 1;
  if (TotalSize <= EFI_STATUS_CODE_DATA_MAX_SIZE) {
    //
    // Fill in EFI_DEBUG_ASSERT_DATA
    //
    AssertData = (EFI_DEBUG_ASSERT_DATA *)Buffer;
    AssertData->LineNumber = (UINT32)LineNumber;

    //
    // Copy Ascii FileName including NULL.
    //
    Temp = AsciiStrCpy ((CHAR8 *)(AssertData + 1), FileName);

    //
    // Copy Ascii Description 
    //
    AsciiStrCpy (Temp + AsciiStrLen (FileName) + 1, Description);

    REPORT_STATUS_CODE_WITH_EXTENDED_DATA (
      (EFI_ERROR_CODE | EFI_ERROR_UNRECOVERED),
      (EFI_SOFTWARE_DXE_BS_DRIVER | EFI_SW_EC_ILLEGAL_SOFTWARE_STATE),
      AssertData,
      TotalSize
      );
  }

  //
  // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings
  //
  if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {
    CpuBreakpoint ();
  } else if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {
    CpuDeadLoop ();
  }
}

EFI_STATUS
FileDelete (
  IN EFI_FILE *File
  )
{
  SEMIHOST_FCB *Fcb = NULL;
  EFI_STATUS   Status;
  CHAR8        *FileName;
  UINTN        NameSize;

  Fcb = SEMIHOST_FCB_FROM_THIS(File);

  if (!Fcb->IsRoot) {
    // Get the filename from the Fcb
    NameSize = AsciiStrLen (Fcb->FileName);
    FileName = AllocatePool (NameSize + 1);

    AsciiStrCpy (FileName, Fcb->FileName);

    // Close the file if it's open.  Disregard return status,
    // since it might give an error if the file isn't open.
    File->Close (File);

    // Call the semihost interface to delete the file.
    Status = SemihostFileRemove (FileName);
  } else {
    Status = EFI_UNSUPPORTED;
  }

  return Status;
}

/** ‘G XX...’
 Writes the new values received into the input buffer to the general registers

 @param   SystemContext       Register content at time of the exception
 @param   InBuffer          Pointer to the input buffer received from gdb server
 **/
VOID
EFIAPI
WriteGeneralRegisters (
  IN  EFI_SYSTEM_CONTEXT        SystemContext,
  IN  CHAR8             *InBuffer
  )
{
  UINTN  i;
  CHAR8 *InBufPtr; /// pointer to the input buffer

  // check to see if the buffer is the right size which is 
  // 1 (for 'G') + 16 (for 16 registers) * 8 ( for 8 hex chars each) = 129 
  if (AsciiStrLen(InBuffer) != 129) { // 16 regs, 8 hex chars each, and the end '\0' (escape seq)
	//Bad message. Message is not the right length 
    SendError (GDB_EBADBUFSIZE); 
    return;
  }

  InBufPtr = &InBuffer[1];
  
  // Read the new values for the registers from the input buffer to an array, NewValueArray.
  // The values in the array are in the gdb ordering
  for(i=0; i < sizeof (gRegisterOffsets)/sizeof (UINTN); i++) {  // there are only 16 registers to write
    InBufPtr = BasicWriteRegister(SystemContext, i, InBufPtr);
  }

  SendSuccess();
}

/**
  Prints a debug message to the debug output device if the specified error level is enabled.

  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
  GetDebugPrintErrorLevel (), then print the message specified by Format and the
  associated variable argument list to the debug output device.

  If Format is NULL, then ASSERT().

  @param  ErrorLevel  The error level of the debug message.
  @param  Format      Format string for the debug message to print.
  @param  ...         A variable argument list whose contents are accessed
                      based on the format string specified by Format.

**/
VOID
EFIAPI
DebugPrint (
  IN  UINTN        ErrorLevel,
  IN  CONST CHAR8  *Format,
  ...
  )
{
  CHAR8      Buffer[MAX_DEBUG_MESSAGE_LENGTH];
  VA_LIST    Marker;

  //
  // If Format is NULL, then ASSERT().
  //
  ASSERT (Format != NULL);

  //
  // Check driver debug mask value and global mask
  //
  if ((ErrorLevel & GetDebugPrintErrorLevel ()) == 0) {
    return;
  }

  //
  // Convert the DEBUG() message to an ASCII String
  //
  VA_START (Marker, Format);
  AsciiVSPrint (Buffer, sizeof (Buffer), Format, Marker);
  VA_END (Marker);

  //
  // Send the print string to EFI_DEBUGPORT_PROTOCOL.Write.
  //
  UefiDebugLibDebugPortProtocolWrite (Buffer, AsciiStrLen (Buffer));
}

/**
  Extracts ASSERT() information from a status code structure.

  Converts the status code specified by CodeType, Value, and Data to the ASSERT()
  arguments specified by Filename, Description, and LineNumber.  If CodeType is
  an EFI_ERROR_CODE, and CodeType has a severity of EFI_ERROR_UNRECOVERED, and
  Value has an operation mask of EFI_SW_EC_ILLEGAL_SOFTWARE_STATE, extract
  Filename, Description, and LineNumber from the optional data area of the
  status code buffer specified by Data.  The optional data area of Data contains
  a Null-terminated ASCII string for the FileName, followed by a Null-terminated
  ASCII string for the Description, followed by a 32-bit LineNumber.  If the
  ASSERT() information could be extracted from Data, then return TRUE.
  Otherwise, FALSE is returned.

  If Data is NULL, then ASSERT().
  If Filename is NULL, then ASSERT().
  If Description is NULL, then ASSERT().
  If LineNumber is NULL, then ASSERT().

  @param  CodeType     The type of status code being converted.
  @param  Value        The status code value being converted.
  @param  Data         Pointer to status code data buffer.
  @param  Filename     Pointer to the source file name that generated the ASSERT().
  @param  Description  Pointer to the description of the ASSERT().
  @param  LineNumber   Pointer to source line number that generated the ASSERT().

  @retval  TRUE   The status code specified by CodeType, Value, and Data was
                  converted ASSERT() arguments specified by Filename, Description,
                  and LineNumber.
  @retval  FALSE  The status code specified by CodeType, Value, and Data could
                  not be converted to ASSERT() arguments.

**/
BOOLEAN
EFIAPI
ReportStatusCodeExtractAssertInfo (
  IN EFI_STATUS_CODE_TYPE        CodeType,
  IN EFI_STATUS_CODE_VALUE       Value,
  IN CONST EFI_STATUS_CODE_DATA  *Data,
  OUT CHAR8                      **Filename,
  OUT CHAR8                      **Description,
  OUT UINT32                     *LineNumber
  )
{
  EFI_DEBUG_ASSERT_DATA  *AssertData;

  ASSERT (Data        != NULL);
  ASSERT (Filename    != NULL);
  ASSERT (Description != NULL);
  ASSERT (LineNumber  != NULL);

  if (((CodeType & EFI_STATUS_CODE_TYPE_MASK)      == EFI_ERROR_CODE) &&
      ((CodeType & EFI_STATUS_CODE_SEVERITY_MASK)  == EFI_ERROR_UNRECOVERED) &&
      ((Value    & EFI_STATUS_CODE_OPERATION_MASK) == EFI_SW_EC_ILLEGAL_SOFTWARE_STATE)) {
    AssertData   = (EFI_DEBUG_ASSERT_DATA *)(Data + 1);
    *Filename    = (CHAR8 *)(AssertData + 1);
    *Description = *Filename + AsciiStrLen (*Filename) + 1;
    *LineNumber  = AssertData->LineNumber;
    return TRUE;
  }
  return FALSE;
}

VOID
EFIAPI
WriteGeneralRegisters (
  IN  EFI_SYSTEM_CONTEXT  SystemContext,
  IN  CHAR8               *InBuffer
  )
{
  UINTN  i;
  CHAR8  *InBufPtr; /// pointer to the input buffer
  UINTN  MinLength;
  UINTN  RegisterCount = (sizeof (gRegisterOffsets)/sizeof (UINTN));

  MinLength = (RegisterCount * 8) + 1;  // 'G' plus the registers in ASCII format

  if (AsciiStrLen(InBuffer) < MinLength) {
    //Bad message. Message is not the right length
    SendError (GDB_EBADBUFSIZE);
    return;
  }

  InBufPtr = &InBuffer[1];

  // Read the new values for the registers from the input buffer to an array, NewValueArray.
  // The values in the array are in the gdb ordering
  for(i = 0; i < RegisterCount; i++) {
    InBufPtr = BasicWriteRegister (SystemContext, i, InBufPtr);
  }

  SendSuccess ();
}

STATIC
VOID
SetupCmdlineTag (
  IN CONST CHAR8 *CmdLine
  )
{
  UINT32 LineLength;

  // Increment the line length by 1 to account for the null string terminator character
  LineLength = AsciiStrLen(CmdLine) + 1;

  /* Check for NULL strings.
   * Do not insert a tag for an empty CommandLine, don't even modify the tag address pointer.
   * Remember, you have at least one null string terminator character.
   */
  if(LineLength > 1) {
    mLinuxKernelCurrentAtag->header.size = ((UINT32)sizeof(LINUX_ATAG_HEADER) + LineLength + (UINT32)3) >> 2;
    mLinuxKernelCurrentAtag->header.type = ATAG_CMDLINE;

    /* place CommandLine into tag */
    AsciiStrCpy(mLinuxKernelCurrentAtag->body.cmdline_tag.cmdline, CmdLine);

    // move pointer to next tag
    mLinuxKernelCurrentAtag = next_tag_address(mLinuxKernelCurrentAtag);
  }

RETURN_STATUS
SemihostFileOpen (
  IN  CHAR8  *FileName,
  IN  UINT32 Mode,
  OUT UINT32 *FileHandle
  )
{
  SEMIHOST_FILE_OPEN_BLOCK  OpenBlock;
  INT32                     Result;

  if (FileHandle == NULL) {
    return RETURN_INVALID_PARAMETER;
  }

  OpenBlock.FileName    = FileName;
  OpenBlock.Mode        = Mode;
  OpenBlock.NameLength  = AsciiStrLen(FileName);

  Result = Semihost_SYS_OPEN(&OpenBlock);

  if (Result == -1) {
    return RETURN_NOT_FOUND;
  } else {
    *FileHandle = Result;
    return RETURN_SUCCESS;
  }
}

/**
  Get section entry GUID value.

  @param[in]  Context         INI Config file context.
  @param[in]  SectionName     Section name.
  @param[in]  EntryName       Section entry name.
  @param[out] Guid            Point to the got GUID value.

  @retval EFI_SUCCESS    Section entry GUID value is got.
  @retval EFI_NOT_FOUND  Section is not found.
**/
EFI_STATUS
EFIAPI
GetGuidFromDataFile (
  IN      VOID                          *Context,
  IN      CHAR8                         *SectionName,
  IN      CHAR8                         *EntryName,
  OUT     EFI_GUID                      *Guid
  )
{
  CHAR8                                 *Value;
  EFI_STATUS                            Status;

  if (Context == NULL || SectionName == NULL || EntryName == NULL || Guid == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  Status = GetStringFromDataFile(
             Context,
             SectionName,
             EntryName,
             &Value
             );
  if (EFI_ERROR(Status)) {
    return EFI_NOT_FOUND;
  }
  ASSERT (Value != NULL);
  if (!IsValidGuid(Value, AsciiStrLen(Value))) {
    return EFI_NOT_FOUND;
  }
  Status = AsciiStrToGuid(Value, Guid);
  if (EFI_ERROR (Status)) {
    return EFI_NOT_FOUND;
  }
  return EFI_SUCCESS;
}

/**
  The initator checks the CHAP response replied by target against its own
  calculation of the expected hash value.

  @param[in]   AuthData             iSCSI CHAP authentication data.
  @param[in]   TargetResponse       The response from target.

  @retval EFI_SUCCESS               The response from target passed authentication.
  @retval EFI_SECURITY_VIOLATION    The response from target was not expected value.
  @retval Others                    Other errors as indicated.

**/
EFI_STATUS
IScsiCHAPAuthTarget (
  IN  ISCSI_CHAP_AUTH_DATA  *AuthData,
  IN  UINT8                 *TargetResponse
  )
{
  EFI_STATUS  Status;
  UINT32      SecretSize;
  UINT8       VerifyRsp[ISCSI_CHAP_RSP_LEN];

  Status      = EFI_SUCCESS;

  SecretSize  = (UINT32) AsciiStrLen (AuthData->AuthConfig->ReverseCHAPSecret);
  Status = IScsiCHAPCalculateResponse (
             AuthData->OutIdentifier,
             AuthData->AuthConfig->ReverseCHAPSecret,
             SecretSize,
             AuthData->OutChallenge,
             AuthData->OutChallengeLength,
             VerifyRsp
             );

  if (CompareMem (VerifyRsp, TargetResponse, ISCSI_CHAP_RSP_LEN) != 0) {
    Status = EFI_SECURITY_VIOLATION;
  }

  return Status;
}

CHAR8* NewSymbol(CHAR8* string)
{
	SymbolPtr	lastGuy = 0;
	SymbolPtr	symbol;

	// Look for string in the list of symbols.
	symbol = FindSymbol(string, 0);

	// Add the new symbol.
	if (symbol == NULL)
	{
		
		symbol = (SymbolPtr)AllocateZeroPool(sizeof(Symbol) + 1 + AsciiStrLen(string));
		if (symbol == NULL) 
			return NULL;

		// Set the symbol's data.
		symbol->refCount = 0;
		
		AsciiStrCpy(symbol->string, string);

		// Add the symbol to the list.
		symbol->next = gSymbolsHead;
		gSymbolsHead = symbol;
	}

	// Update the refCount and return the string.
	symbol->refCount++;

	if (lastGuy && lastGuy->next != 0) 
		return NULL;

	return symbol->string;
}

/**
  Prints an assert message containing a filename, line number, and description.  
  This may be followed by a breakpoint or a dead loop.

  Print a message of the form "ASSERT <FileName>(<LineNumber>): <Description>\n"
  to the debug output device.  If DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED bit of 
  PcdDebugProperyMask is set then CpuBreakpoint() is called. Otherwise, if 
  DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED bit of PcdDebugProperyMask is set then 
  CpuDeadLoop() is called.  If neither of these bits are set, then this function 
  returns immediately after the message is printed to the debug output device.
  DebugAssert() must actively prevent recursion.  If DebugAssert() is called while
  processing another DebugAssert(), then DebugAssert() must return immediately.

  If FileName is NULL, then a <FileName> string of "(NULL) Filename" is printed.
  If Description is NULL, then a <Description> string of "(NULL) Description" is printed.

  @param  FileName     The pointer to the name of the source file that generated the assert condition.
  @param  LineNumber   The line number in the source file that generated the assert condition
  @param  Description  The pointer to the description of the assert condition.

**/
VOID
EFIAPI
DebugAssert (
  IN CONST CHAR8  *FileName,
  IN UINTN        LineNumber,
  IN CONST CHAR8  *Description
  )
{
  CHAR8  Buffer[MAX_DEBUG_MESSAGE_LENGTH];

  //
  // Generate the ASSERT() message in Ascii format
  //
  AsciiSPrint (Buffer, sizeof (Buffer), "ASSERT %a(%d): %a\n", FileName, LineNumber, Description);

  //
  // Send the print string to the Console Output device
  //
  AcquireSpinLock (&mInternalDebugLock);
  SerialPortWrite ((UINT8 *) Buffer, AsciiStrLen(Buffer));
  ReleaseSpinLock (&mInternalDebugLock);

  //
  // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings
  //
  if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {
    CpuBreakpoint ();
  } else if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {
    CpuDeadLoop ();
  }
}

/**
  Get section entry heximal UINT64 value.

  @param[in]  Context         INI Config file context.
  @param[in]  SectionName     Section name.
  @param[in]  EntryName       Section entry name.
  @param[out] Data            Point to the got heximal UINT64 value.

  @retval EFI_SUCCESS    Section entry heximal UINT64 value is got.
  @retval EFI_NOT_FOUND  Section is not found.
**/
EFI_STATUS
EFIAPI
GetHexUint64FromDataFile (
  IN      VOID                          *Context,
  IN      CHAR8                         *SectionName,
  IN      CHAR8                         *EntryName,
  OUT     UINT64                        *Data
  )
{
  CHAR8                                 *Value;
  EFI_STATUS                            Status;

  if (Context == NULL || SectionName == NULL || EntryName == NULL || Data == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  Status = GetStringFromDataFile(
             Context,
             SectionName,
             EntryName,
             &Value
             );
  if (EFI_ERROR(Status)) {
    return EFI_NOT_FOUND;
  }
  ASSERT (Value != NULL);
  if (!IsValidHexString(Value, AsciiStrLen(Value))) {
    return EFI_NOT_FOUND;
  }
  *Data = AsciiStrHexToUint64(Value);
  return EFI_SUCCESS;
}

/**
  Save this command in the circular history buffer. Older commands are
  overwritten with newer commands.

  @param  Cmd   Command line to archive the history of.

  @return None

**/
VOID
SetCmdHistory (
  IN  CHAR8 *Cmd
  )
{
  // Don't bother adding empty commands to the list
  if (AsciiStrLen(Cmd) != 0) {

    // First entry
    if (mCmdHistoryStart == -1) {
      mCmdHistoryStart   = 0;
      mCmdHistoryEnd     = 0;
    } else {
      // Record the new command at the next index
      RingBufferIncrement(&mCmdHistoryStart);

      // If the next index runs into the end index, shuffle end back by one
      if (mCmdHistoryStart == mCmdHistoryEnd) {
        RingBufferIncrement(&mCmdHistoryEnd);
      }
    }

    // Copy the new command line into the ring buffer
    AsciiStrnCpyS (&mCmdHistory[mCmdHistoryStart][0], MAX_CMD_LINE, Cmd, MAX_CMD_LINE);
  }

  // Reset the command history for the next up arrow press
  mCmdHistoryCurrent = mCmdHistoryStart;
}

/**

  Prints a debug message to the debug output device if the specified error level is enabled.

  If any bit in ErrorLevel is also set in PcdDebugPrintErrorLevel, then print 
  the message specified by Format and the associated variable argument list to 
  the debug output device.

  If Format is NULL, then ASSERT().

  @param  ErrorLevel  The error level of the debug message.
  @param  Format      Format string for the debug message to print.

**/
VOID
EFIAPI
DebugPrint (
  IN  UINTN        ErrorLevel,
  IN  CONST CHAR8  *Format,
  ...
  )
{
  UINT64          Buffer[EFI_STATUS_CODE_DATA_MAX_SIZE / sizeof (UINT64)];
  EFI_DEBUG_INFO  *DebugInfo;
  UINTN           TotalSize;
  UINTN           Index;
  VA_LIST         Marker;
  UINT64          *ArgumentPointer;

  //
  // If Format is NULL, then ASSERT().
  //
  ASSERT (Format != NULL);

  //
  // Check driver Debug Level value and global debug level
  //
  if ((ErrorLevel & PcdGet32(PcdDebugPrintErrorLevel)) == 0) {
    return;
  }

  TotalSize = sizeof (EFI_DEBUG_INFO) + 12 * sizeof (UINT64) + AsciiStrLen (Format) + 1;
  if (TotalSize > EFI_STATUS_CODE_DATA_MAX_SIZE) {
    return;
  }

  //
  // Then EFI_DEBUG_INFO
  //
  DebugInfo = (EFI_DEBUG_INFO *)Buffer;
  DebugInfo->ErrorLevel = (UINT32)ErrorLevel;

  //
  // 256 byte mini Var Arg stack. That is followed by the format string.
  //
  VA_START (Marker, Format);
  for (Index = 0, ArgumentPointer = (UINT64 *)(DebugInfo + 1); Index < 12; Index++, ArgumentPointer++) {
    WriteUnaligned64(ArgumentPointer, VA_ARG (Marker, UINT64));
  }
  VA_END (Marker);
  AsciiStrCpy ((CHAR8 *)ArgumentPointer, Format);

  REPORT_STATUS_CODE_EX (
    EFI_DEBUG_CODE,
    (EFI_SOFTWARE_DXE_BS_DRIVER | EFI_DC_UNSPECIFIED),
    0,
    NULL,
    &gEfiStatusCodeDataTypeDebugGuid,
    DebugInfo,
    TotalSize
    );
}