Exemplo n.º 1
0
/**
  INTN Subtraction

  Performs the requested operation using the input parameters into a value
  specified by Result type and stores the converted value into the caller
  allocated output buffer specified by Result.  The caller must pass in a
  Result buffer that is at least as large as the Result type.

  If Result is NULL, RETURN_INVALID_PARAMETER is returned.

  If the requested operation results in an overflow or an underflow condition,
  then Result is set to INTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.

  @param[in]   Minuend     A number from which another is to be subtracted.
  @param[in]   Subtrahend  A number to be subtracted from another
  @param[out]  Result      Pointer to the result of subtraction

  @retval  RETURN_SUCCESS            Successful subtraction
  @retval  RETURN_BUFFER_TOO_SMALL   Underflow
  @retval  RETURN_INVALID_PARAMETER  Result is NULL
**/
RETURN_STATUS
EFIAPI
SafeIntnSub (
  IN  INTN  Minuend,
  IN  INTN  Subtrahend,
  OUT INTN  *Result
  )
{
  return SafeInt64Sub ((INT64)Minuend, (INT64)Subtrahend, (INT64 *)Result);
}
/**
  INTN Subtraction

  Performs the requested operation using the input parameters into a value
  specified by Result type and stores the converted value into the caller
  allocated output buffer specified by Result.  The caller must pass in a
  Result buffer that is at least as large as the Result type.

  If Result is NULL, RETURN_INVALID_PARAMETER is returned.

  If the requested operation results in an overflow or an underflow condition,
  then Result is set to INTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.

  @param[in]   Minuend     A number from which another is to be subtracted.
  @param[in]   Subtrahend  A number to be subtracted from another
  @param[out]  Result      Pointer to the result of subtraction

  @retval  RETURN_SUCCESS            Successful subtraction
  @retval  RETURN_BUFFER_TOO_SMALL   Underflow
  @retval  RETURN_INVALID_PARAMETER  Result is NULL
**/
RETURN_STATUS
EFIAPI
SafeIntnSub (
  IN  INTN  Minuend,
  IN  INTN  Subtrahend,
  OUT INTN  *Result
  )
{
  if (sizeof (UINTN) == sizeof (UINT32)) {
    return SafeInt64ToIntn (((INT64)Minuend) - ((INT64)Subtrahend), Result);
  }
  return SafeInt64Sub ((INT64)Minuend, (INT64)Subtrahend, (INT64 *)Result);
}