Function AsciiStrnCmp

MdePkg/Library/BaseLib/String.c:1456–1498

Compares two Null-terminated ASCII strings with maximum lengths, and returns the difference between the first mismatched ASCII characters. This function compares the Null-terminated ASCII string FirstString to the Null-terminated ASCII string SecondString. At most, Length ASCII characters will be compared. If Length is 0, then 0 is returned. If FirstString is identical to SecondS

**/
INTN
EFIAPI
AsciiStrnCmp (
  IN      CONST CHAR8               *FirstString,
  IN      CONST CHAR8               *SecondString,
  IN      UINTN                     Length
  )
{
  if (Length == 0) {
    return 0;
  }

  //
  // ASSERT both strings are less long than PcdMaximumAsciiStringLength
  //
//  ASSERT (AsciiStrSize (FirstString));
//  ASSERT (AsciiStrSize (SecondString));
  if (!AsciiStrSize (FirstString) && !AsciiStrSize (SecondString)) {
    return 0;
  }
  if (!AsciiStrSize (FirstString)) {
    return -1;
  }
  if (!AsciiStrSize (SecondString)) {
    return 1;
  }

//  if (PcdGet32 (PcdMaximumAsciiStringLength) != 0) {
//    ASSERT (Length <= PcdGet32 (PcdMaximumAsciiStringLength));
    if (Length > 100000000ull) {
      Length = 100000000ull;
  }

  while ((*FirstString != '\0') &&
         (*SecondString != '\0') &&
         (*FirstString == *SecondString) &&
         (Length > 1)) {
    FirstString++;
    SecondString++;
    Length--;
  }
  return *FirstString - *SecondString;
}

#ifndef DISABLE_NEW_DEPRECATED_INTERFACES