Function AsciiStrLen

MdePkg/Library/BaseLib/String.c:1197–1223

Returns the length of a Null-terminated ASCII string. This function returns the number of ASCII characters in the Null-terminated ASCII string specified by String. If Length > 0 and Destination is NULL, then ASSERT(). If Length > 0 and Source is NULL, then ASSERT(). If PcdMaximumAsciiStringLength is not zero and String contains more than PcdMaximumAsciiStringLength ASCII char

**/
UINTN
EFIAPI
AsciiStrLen(
  IN      CONST CHAR8               *String
  )
{
  UINTN                             Length;

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

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

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