Function StrDecimalToUintnS

MdePkg/Library/BaseLib/SafeString.c:638–704

Convert a Null-terminated Unicode decimal string to a value of type UINTN. This function outputs a value of type UINTN by interpreting the contents of the Unicode string specified by String as a decimal number. The format of the input Unicode string String is: [spaces] [decimal digits]. The valid decimal digit character is in the range [0-9]. The function will

**/
RETURN_STATUS
EFIAPI
StrDecimalToUintnS (
  IN  CONST CHAR16             *String,
  OUT       CHAR16             **EndPointer,  OPTIONAL
  OUT       UINTN              *Data
  )
{
  ASSERT (((UINTN) String & BIT0) == 0);

  //
  // 1. Neither String nor Data shall be a null pointer.
  //
  SAFE_STRING_CONSTRAINT_CHECK ((String != NULL), RETURN_INVALID_PARAMETER);
  SAFE_STRING_CONSTRAINT_CHECK ((Data != NULL), RETURN_INVALID_PARAMETER);

  //
  // 2. The length of String shall not be greater than RSIZE_MAX.
  //
//  if (RSIZE_MAX != 0) {
//    SAFE_STRING_CONSTRAINT_CHECK ((StrnLenS (String, RSIZE_MAX + 1) <= RSIZE_MAX), RETURN_INVALID_PARAMETER);
//  }

  if (EndPointer != NULL) {
    *EndPointer = (CHAR16 *) String;
  }

  //
  // Ignore the pad spaces (space or tab)
  //
  while ((*String == L' ') || (*String == L'\t')) {
    String++;
  }

  //
  // Ignore leading Zeros after the spaces
  //
  while (*String == L'0') {
    String++;
  }

  *Data = 0;

  while (InternalIsDecimalDigitCharacter (*String)) {
    //
    // If the number represented by String overflows according to the range
    // defined by UINTN, then MAX_UINTN is stored in *Data and
    // RETURN_UNSUPPORTED is returned.
    //
//    if (*Data > ((MAX_UINTN - (*String - L'0')) / 10)) {
//      *Data = MAX_UINTN;
//      if (EndPointer != NULL) {
//        *EndPointer = (CHAR16 *) String;
//      }
//      return RETURN_UNSUPPORTED;
//      ASSERT (*Data <= ((((UINTN) ~0) - (*String - L'0')) / 10));
//    }