+// Returns -1 if (Time1 < Time2), +1 if (Time1 > Time2), or 0 if
+// (Time1 == Time2). Precision is only to the nearest second; since
+// this is used for sorting boot loader entries, differences smaller
+// than this are likely to be meaningless (and unlikely!).
+INTN TimeComp(EFI_TIME *Time1, EFI_TIME *Time2) {
+ INT64 Time1InSeconds, Time2InSeconds;
+
+ // Following values are overestimates; I'm assuming 31 days in every month.
+ // This is fine for the purpose of this function, which has a limited
+ // purpose.
+ Time1InSeconds = Time1->Second + (Time1->Minute * 60) + (Time1->Hour * 3600) + (Time1->Day * 86400) +
+ (Time1->Month * 2678400) + ((Time1->Year - 1998) * 32140800);
+ Time2InSeconds = Time2->Second + (Time2->Minute * 60) + (Time2->Hour * 3600) + (Time2->Day * 86400) +
+ (Time2->Month * 2678400) + ((Time2->Year - 1998) * 32140800);
+ if (Time1InSeconds < Time2InSeconds)
+ return (-1);
+ else if (Time1InSeconds > Time2InSeconds)
+ return (1);
+
+ return 0;
+} // INTN TimeComp()
+
+// Adds a loader list element, keeping it sorted by date. Returns the new
+// first element (the one with the most recent date).
+static struct LOADER_LIST * AddLoaderListEntry(struct LOADER_LIST *LoaderList, struct LOADER_LIST *NewEntry) {
+ struct LOADER_LIST *LatestEntry, *CurrentEntry, *PrevEntry = NULL;
+
+ LatestEntry = CurrentEntry = LoaderList;
+ if (LoaderList == NULL) {
+ LatestEntry = NewEntry;
+ } else {
+ while ((CurrentEntry != NULL) && (TimeComp(&(NewEntry->TimeStamp), &(CurrentEntry->TimeStamp)) < 0)) {
+ PrevEntry = CurrentEntry;
+ CurrentEntry = CurrentEntry->NextEntry;
+ } // while
+ NewEntry->NextEntry = CurrentEntry;
+ if (PrevEntry == NULL) {
+ LatestEntry = NewEntry;
+ } else {
+ PrevEntry->NextEntry = NewEntry;
+ } // if/else
+ } // if/else
+ return (LatestEntry);
+} // static VOID AddLoaderListEntry()
+
+// Delete the LOADER_LIST linked list
+static VOID CleanUpLoaderList(struct LOADER_LIST *LoaderList) {
+ struct LOADER_LIST *Temp;
+
+ while (LoaderList != NULL) {
+ Temp = LoaderList;
+ LoaderList = LoaderList->NextEntry;
+ FreePool(Temp->FileName);
+ FreePool(Temp);
+ } // while
+} // static VOID CleanUpLoaderList()
+