Fix special case in SetupGetLineTextA/W and SetupGetStringFieldA/W when Buffer is NULL and BufferSize is 0, by reverting part of r17162
Fixes bug #724, spotted by GvG
Do according changes in SetupDiBuildDriverInfoList

Modified: trunk/reactos/lib/setupapi/devinst.c
Modified: trunk/reactos/lib/setupapi/parser.c

--- trunk/reactos/lib/setupapi/devinst.c	2005-08-23 14:56:38 UTC (rev 17482)
+++ trunk/reactos/lib/setupapi/devinst.c	2005-08-23 17:38:14 UTC (rev 17483)
@@ -3564,8 +3564,9 @@

                         0, /* Field index */
                         NULL, 0,
                         &RequiredSize);

-                    if (!Result && GetLastError() == ERROR_INSUFFICIENT_BUFFER)

+                    if (Result)

                     {

+                        /* We got the needed size for the buffer */

                         ManufacturerName = HeapAlloc(GetProcessHeap(), 0, RequiredSize * sizeof(WCHAR));
                         if (!ManufacturerName)
                         {
@@ -3583,8 +3584,9 @@

                         1, /* Field index */
                         NULL, 0,
                         &RequiredSize);

-                    if (!Result && GetLastError() == ERROR_INSUFFICIENT_BUFFER)

+                    if (Result)

                     {

+                        /* We got the needed size for the buffer */

                         ManufacturerSection = HeapAlloc(GetProcessHeap(), 0, RequiredSize * sizeof(WCHAR));
                         if (!ManufacturerSection)
                         {

--- trunk/reactos/lib/setupapi/parser.c	2005-08-23 14:56:38 UTC (rev 17482)
+++ trunk/reactos/lib/setupapi/parser.c	2005-08-23 17:38:14 UTC (rev 17483)
@@ -1523,13 +1523,13 @@

         total += PARSER_string_substW( file, field->text, NULL, 0 ) + 1;
 
     if (required) *required = total;

-    if (total > size)
-    {
-        SetLastError( ERROR_INSUFFICIENT_BUFFER );
-        return FALSE;
-    }

     if (buffer)
     {

+        if (total > size)
+        {
+            SetLastError( ERROR_INSUFFICIENT_BUFFER );
+            return FALSE;
+        }

         for (i = 0, field = &file->fields[line->first_field]; i < line->nb_fields; i++, field++)
         {
             unsigned int len = PARSER_string_substW( file, field->text, buffer, size );
@@ -1574,13 +1574,13 @@

         total += PARSER_string_substA( file, field->text, NULL, 0 ) + 1;
 
     if (required) *required = total;

-    if (total > size)
-    {
-        SetLastError( ERROR_INSUFFICIENT_BUFFER );
-        return FALSE;
-    }

     if (buffer)
     {

+        if (total > size)
+        {
+            SetLastError( ERROR_INSUFFICIENT_BUFFER );
+            return FALSE;
+        }

         for (i = 0, field = &file->fields[line->first_field]; i < line->nb_fields; i++, field++)
         {
             unsigned int len = PARSER_string_substA( file, field->text, buffer, size );
@@ -1619,13 +1619,13 @@

     if (!field) return FALSE;
     len = PARSER_string_substA( file, field->text, NULL, 0 );
     if (required) *required = len + 1;

-    if (size <= len)
-    {
-        SetLastError( ERROR_INSUFFICIENT_BUFFER );
-        return FALSE;
-    }

     if (buffer)
     {

+        if (size <= len)
+        {
+            SetLastError( ERROR_INSUFFICIENT_BUFFER );
+            return FALSE;
+        }

         PARSER_string_substA( file, field->text, buffer, size );
 
         TRACE( "context %p/%p/%d/%d index %ld returning %s\n",
@@ -1650,13 +1650,13 @@

     if (!field) return FALSE;
     len = PARSER_string_substW( file, field->text, NULL, 0 );
     if (required) *required = len + 1;

-    if (size <= len)
-    {
-        SetLastError( ERROR_INSUFFICIENT_BUFFER );
-        return FALSE;
-    }

     if (buffer)
     {

+        if (size <= len)
+        {
+            SetLastError( ERROR_INSUFFICIENT_BUFFER );
+            return FALSE;
+        }

         PARSER_string_substW( file, field->text, buffer, size );
 
         TRACE( "context %p/%p/%d/%d index %ld returning %s\n",