Function AsciiStrnLenS

MdePkg/Library/BaseLib/SafeString.c:1716–1746

Returns the length of a Null-terminated Ascii string. This function is similar as strlen_s defined in C11. @param String A pointer to a Null-terminated Ascii string. @param MaxSize The maximum number of Destination Ascii char, including terminating null char. @retval 0 If String is NULL. @retval MaxSize If there is no null character in the firs

**/
UINTN
EFIAPI
AsciiStrnLenS (
  IN CONST CHAR8               *String,
  IN UINTN                     MaxSize
  )
{
  UINTN                             Length;

  //
  // If String is a null pointer, then the AsciiStrnLenS function returns zero.
  //
  if (String == NULL) {
    return 0;
  }

  //
  // Otherwise, the AsciiStrnLenS function returns the number of characters that precede the
  // terminating null character. If there is no null character in the first MaxSize characters of
  // String then AsciiStrnLenS returns MaxSize. At most the first MaxSize characters of String shall
  // be accessed by AsciiStrnLenS.
  //
  Length = 0;
  while (String[Length] != 0) {
    if (Length >= MaxSize - 1) {
      return MaxSize;
    }
    Length++;
  }
  return Length;
}

/**
  Returns the size of a Null-terminated Ascii string in bytes, including the