Function StrLen

MdePkg/Library/BaseLib/String.c:174–200

Returns the length of a Null-terminated Unicode string. This function returns the number of Unicode characters in the Null-terminated Unicode string specified by String. If String is NULL, then ASSERT(). If String is not aligned on a 16-bit boundary, then ASSERT(). If PcdMaximumUnicodeStringLength is not zero, and String contains more than PcdMaximumUnicodeStringLength Unicod

**/
UINTN
EFIAPI
StrLen (
  IN      CONST CHAR16              *String
  )
{
  UINTN                             Length;

//  ASSERT (String != NULL);
  ASSERT (((UINTN) String & BIT0) == 0);
  if (!String) {
    return 0;
  }

  for (Length = 0; *String != L'\0'; String++, Length++) {
    //
    // If PcdMaximumUnicodeStringLength is not zero,
    // length should not more than PcdMaximumUnicodeStringLength
    //
//    if (PcdGet32 (PcdMaximumUnicodeStringLength) != 0) {
//      ASSERT (Length < PcdGet32 (PcdMaximumUnicodeStringLength));
      if (Length >= 100000000ull) {
        break;
    }
  }
  return Length;
}

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