[ekohl] 53726: [RTL] Fix the overly complicated and buggy implementation of RtlIsDosDeviceName_Ustr based on the simple pre-r52687 implementation of RtlIsDosDeviceName_U. This fixes 14(!) wine tests.

Author: ekohl
Date: Sat Sep 17 00:55:02 2011
New Revision: 53726

URL: http://svn.reactos.org/svn/reactos?rev=53726&view=rev
Log:
[RTL]
Fix the overly complicated and buggy implementation of RtlIsDosDeviceName_Ustr based on
the simple pre-r52687 implementation of RtlIsDosDeviceName_U. This fixes 14(!) wine
tests.

Modified:
    trunk/reactos/lib/rtl/path.c

Modified: trunk/reactos/lib/rtl/path.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/path.c?rev=53726&a…
==============================================================================
--- trunk/reactos/lib/rtl/path.c [iso-8859-1] (original)
+++ trunk/reactos/lib/rtl/path.c [iso-8859-1] Sat Sep 17 00:55:02 2011
@@ -45,11 +45,9 @@
 NTAPI
 RtlIsDosDeviceName_Ustr(IN PUNICODE_STRING PathString)
 {
-    UNICODE_STRING PathCopy;
-    PWCHAR Start, End;
-    ULONG PathChars, ColonCount = 0;
-    USHORT ReturnOffset = 0, ReturnLength;
-    WCHAR c;
+    UNICODE_STRING DeviceName;
+    PWCHAR Start, End, Ptr;
+    ULONG DeviceNameLength;
 
     /* Validate the input */
     if (!PathString) return 0;
@@ -71,129 +69,61 @@
             }
             return 0;
 
+        /* Skip the drive name for drive relative or absolute paths */
+        case RtlPathTypeDriveAbsolute:
+        case RtlPathTypeDriveRelative:
+            Start = PathString->Buffer + 2;
+            break;
+
         default:
+            Start = PathString->Buffer;
             break;
     }
 
-    /* Make a copy of the string */
-    PathCopy = *PathString;
-
-    /* Return if there's no characters */
-    PathChars = PathCopy.Length / sizeof(WCHAR);
-    if (!PathChars) return 0;
-
-    /* Check for drive path and truncate */
-    if (PathCopy.Buffer[PathChars - 1] == L':')
-    {
-        /* Fixup the lengths */
-        PathCopy.Length -= sizeof(WCHAR);
-        if (!--PathChars) return 0;
-
-        /* Remember this for later */
-        ColonCount = 1;
-    }
-
-    /* Check for extension or space, and truncate */
-    c = PathCopy.Buffer[PathChars - 1];
-    do
-    {
-        /* Stop if we hit a space or period */
-        if ((c != '.') && (c != ' ')) break;
-
-        /* Fixup the lengths and get the next character */
-        PathCopy.Length -= sizeof(WCHAR);
-        if (!--PathChars) c = PathCopy.Buffer[PathChars - 1];
-
-        /* Remember this for later */
-        ColonCount++;
-    } while (PathChars);
-
-    /* Anything still left? */
-    if (PathChars)
-    {
-        /* Loop from the end */
-        for (End = &PathCopy.Buffer[PathChars - 1];
-             End >= PathCopy.Buffer;
-             --End)
-        {
-            /* Check if the character is a path or drive separator */
-            c = *End;
-            if ((c == '\\') || (c == '/') || ((c == ':')
&& (End == PathCopy.Buffer + 1)))
-            {
-                /* Get the next lower case character */
-                End++;
-                c = *End | ' '; // ' ' == ('z' - 'Z')
-
-                /* Check if it's a DOS device (LPT, COM, PRN, AUX, or NUL) */
-                if ((End < &PathCopy.Buffer[PathCopy.Length / sizeof(WCHAR)])
&&
-                    ((c == 'l') || (c == 'c') || (c == 'p') || (c
== 'a') || (c == 'n')))
-                {
-                    /* Calculate the offset */
-                    ReturnOffset = (PCHAR)End - (PCHAR)PathCopy.Buffer;
-
-                    /* Build the final string */
-                    PathCopy.Length -= ReturnOffset;
-                    PathCopy.Length -= (ColonCount * sizeof(WCHAR));
-                    PathCopy.Buffer = End;
-                    break;
-                }
-            }
-
-            return 0;
-        }
-
-        /* Get the next lower case character and check if it's a DOS device */
-        c = *PathCopy.Buffer | ' '; // ' ' == ('z' -
'Z')
-        if ((c != 'l') && (c != 'c') && (c !=
'p') && (c != 'a') && (c != 'n'))
-        {
-            /* Not LPT, COM, PRN, AUX, or NUL */
-            return 0;
-        }
-    }
-
-    /* Now skip past any extra extension or drive letter characters */
-    Start = PathCopy.Buffer;
-    End = &Start[PathChars];
-    while (Start < End)
-    {
-        c = *Start;
-        if ((c == '.') || (c == ':')) break;
-        Start++;
-    }
-
-    /* And then go backwards to get rid of spaces */
-    while ((Start > PathCopy.Buffer) && (Start[-1] == ' ')) --Start;
-
-    /* Finally see how many characters are left, and that's our size */
-    PathChars = Start - PathCopy.Buffer;
-    PathCopy.Length = PathChars * sizeof(WCHAR);
-
-    /* Check if this is a COM or LPT port, which has a digit after it */
-    if ((PathChars == 4) &&
-        (iswdigit(PathCopy.Buffer[3]) && (PathCopy.Buffer[3] != '0')))
-    {
-        /* Don't compare the number part, just check for LPT or COM */
-        PathCopy.Length -= sizeof(WCHAR);
-        if ((RtlEqualUnicodeString(&PathCopy, &RtlpDosLPTDevice, TRUE)) ||
-            (RtlEqualUnicodeString(&PathCopy, &RtlpDosCOMDevice, TRUE)))
-        {
-            /* Found it */
-            ReturnLength = sizeof(L"COM1");
-            return MAKELONG(ReturnOffset, ReturnLength);
-        }
-    }
-    else if ((PathChars == 3) &&
-             ((RtlEqualUnicodeString(&PathCopy, &RtlpDosPRNDevice, TRUE)) ||
-              (RtlEqualUnicodeString(&PathCopy, &RtlpDosAUXDevice, TRUE)) ||
-              (RtlEqualUnicodeString(&PathCopy, &RtlpDosNULDevice, TRUE)) ||
-              (RtlEqualUnicodeString(&PathCopy, &RtlpDosCONDevice, TRUE))))
-    {
-        /* Otherwise this was something like AUX, NUL, PRN, or CON */
-        ReturnLength = sizeof(L"AUX");
-        return MAKELONG(ReturnOffset, ReturnLength);
-    }
-
-    /* Otherwise, this isn't a valid DOS device */
+    /* Find start of file name */
+    for (Ptr = Start; *Ptr; Ptr++)
+        if (IS_PATH_SEPARATOR(*Ptr))
+            Start = Ptr + 1;
+
+    /* Truncate at extension or stream */
+    for (End = Start; *End; End++)
+        if (*End == L'.' || *End == L':')
+            break;
+    End--;
+
+    /* Remove trailing spaces */
+    while (End >= Start && *End == L' ')
+        End--;
+
+    /* Build the device name string */
+    DeviceNameLength = End - Start + 1;
+    DeviceName.Buffer = Start;
+    DeviceName.Length = (USHORT)DeviceNameLength * sizeof(WCHAR);
+    DeviceName.MaximumLength = DeviceName.Length;
+
+    /* Check the device name */
+    if (DeviceNameLength == 3)
+    {
+        if (RtlPrefixUnicodeString(&RtlpDosAUXDevice, &DeviceName, TRUE) ||
+            RtlPrefixUnicodeString(&RtlpDosCONDevice, &DeviceName, TRUE) ||
+            RtlPrefixUnicodeString(&RtlpDosNULDevice, &DeviceName, TRUE) ||
+            RtlPrefixUnicodeString(&RtlpDosPRNDevice, &DeviceName, TRUE))
+        {
+            return MAKELONG(DeviceNameLength * sizeof(WCHAR), (Start -
PathString->Buffer) * sizeof(WCHAR));
+        }
+    }
+    else if (DeviceNameLength == 4)
+    {
+        if ((RtlPrefixUnicodeString(&RtlpDosCOMDevice, &DeviceName, TRUE) ||
+             RtlPrefixUnicodeString(&RtlpDosLPTDevice, &DeviceName, TRUE))
&&
+            iswdigit(DeviceName.Buffer[3]) &&
+            DeviceName.Buffer[3] != L'0')
+        {
+            return MAKELONG(DeviceNameLength * sizeof(WCHAR), (Start -
PathString->Buffer) * sizeof(WCHAR));
+        }
+    }
+
+    /* Otherwise, this is not a valid DOS device */
     return 0;
 }