+// Converts forward slashes to backslashes, removes duplicate slashes, and
+// removes slashes from the end of the pathname.
+// Necessary because some (buggy?) EFI implementations produce "\/" strings
+// in pathnames, because some user inputs can produce duplicate directory
+// separators, and because we want consistent start and end slashes for
+// directory comparisons. A special case: If the PathName refers to root,
+// return "/", since some firmware implementations flake out if this
+// isn't present.
+VOID CleanUpPathNameSlashes(IN OUT CHAR16 *PathName) {
+ CHAR16 *NewName;
+ UINTN i, FinalChar = 0;
+ BOOLEAN LastWasSlash = FALSE;
+
+ NewName = AllocateZeroPool(sizeof(CHAR16) * (StrLen(PathName) + 4));
+ if (NewName != NULL) {
+ for (i = 0; i < StrLen(PathName); i++) {
+ if ((PathName[i] == L'/') || (PathName[i] == L'\\')) {
+ if ((!LastWasSlash) /* && (FinalChar != 0) */)
+ NewName[FinalChar++] = L'\\';
+ LastWasSlash = TRUE;
+ } else {
+ if (FinalChar == 0) {
+ NewName[FinalChar++] = L'\\';
+ }
+ NewName[FinalChar++] = PathName[i];
+ LastWasSlash = FALSE;
+ } // if/else
+ } // for
+ NewName[FinalChar] = 0;
+ if ((FinalChar > 1) && (NewName[FinalChar - 1] == L'\\'))
+ NewName[--FinalChar] = 0;
+ if (FinalChar == 0) {
+ NewName[0] = L'\\';
+ NewName[1] = 0;
+ }
+ // Copy the transformed name back....
+ StrCpy(PathName, NewName);
+ FreePool(NewName);
+ } // if allocation OK
+} // CleanUpPathNameSlashes()
+
+// Splits an EFI device path into device and filename components. For instance, if InString is
+// PciRoot(0x0)/Pci(0x1f,0x2)/Ata(Secondary,Master,0x0)/HD(2,GPT,8314ae90-ada3-48e9-9c3b-09a88f80d921,0x96028,0xfa000)/\bzImage-3.5.1.efi,
+// this function will truncate that input to
+// PciRoot(0x0)/Pci(0x1f,0x2)/Ata(Secondary,Master,0x0)/HD(2,GPT,8314ae90-ada3-48e9-9c3b-09a88f80d921,0x96028,0xfa000)
+// and return bzImage-3.5.1.efi as its return value.
+// It does this by searching for the last ")" character in InString, copying everything
+// after that string (after some cleanup) as the return value, and truncating the original
+// input value.
+// If InString contains no ")" character, this function leaves the original input string
+// unmodified and also returns that string.
+static CHAR16* SplitDeviceString(IN OUT CHAR16 *InString) {
+ INTN i;
+ CHAR16 *FileName = NULL;
+ BOOLEAN Found = FALSE;
+
+ i = StrLen(InString) - 1;
+ while ((i >= 0) && (!Found)) {
+ if (InString[i] == L')') {
+ Found = TRUE;
+ FileName = StrDuplicate(&InString[i + 1]);
+ CleanUpPathNameSlashes(FileName);
+ InString[i + 1] = '\0';
+ } // if
+ i--;
+ } // while
+ if (FileName == NULL)
+ FileName = StrDuplicate(InString);
+ return FileName;
+} // static CHAR16* SplitDeviceString()
+