[gtk+/gtk-2-24] modules/printing/cups/gtkprintbackendcups.c won't build with CUPS 1.6

[John Ralls <jralls src gnome org>]

commit 75103b62e5ba88e03dd5d93442fc0f946dc87c13
Author: John Ralls <jralls ceridwen us>
Date:   Sat Feb 25 17:53:32 2012 -0800

    modules/printing/cups/gtkprintbackendcups.c won't build with CUPS 1.6
    
     Having refactored cups_request_printer_list_cb so that the cups
     version-dependent block size is small enough to be handled in a single
     ifdef, make the ifdef HAVE_CUPS_API_1_6 block

 modules/printbackends/cups/gtkprintbackendcups.c |   24 +++++++++++++++++++++-
 1 files changed, 23 insertions(+), 1 deletions(-)
---
diff --git a/modules/printbackends/cups/gtkprintbackendcups.c b/modules/printbackends/cups/gtkprintbackendcups.c
index a51f681..c7ee014 100644
--- a/modules/printbackends/cups/gtkprintbackendcups.c
+++ b/modules/printbackends/cups/gtkprintbackendcups.c
@@ -2018,7 +2018,29 @@ cups_request_printer_list_cb (GtkPrintBackendCups *cups_backend,
   removed_printer_checklist = gtk_print_backend_get_printer_list (backend);
 								  
   response = gtk_cups_result_get_response (result);
+#ifdef HAVE_CUPS_API_1_6
+  for (attr = ippFirstAttribute (response); attr != NULL;
+       attr = ippNextAttribute (response))
+    {
+      GtkPrinter *printer;
+      gboolean status_changed = FALSE;
+      GList *node;
+      gint i;
+      PrinterSetupInfo *info = g_slice_new0 (PrinterSetupInfo);
+
+      /* Skip leading attributes until we hit a printer...
+       */
+      while (attr != NULL && ippGetGroupTag (attr) != IPP_TAG_PRINTER)
+        attr = ippNextAttribute (response);
 
+      if (attr == NULL)
+        break;
+      while (attr != NULL && ippGetGroupTag (attr) == IPP_TAG_PRINTER)
+      {
+	cups_printer_handle_attribute (cups_backend, attr, info);
+        attr = ippNextAttribute (response);
+      }
+#else
   for (attr = response->attrs; attr != NULL; attr = attr->next)
     {
       GtkPrinter *printer;
@@ -2034,12 +2056,12 @@ cups_request_printer_list_cb (GtkPrintBackendCups *cups_backend,
 
       if (attr == NULL)
         break;
-
       while (attr != NULL && ippGetGroupTag (attr) == IPP_TAG_PRINTER)
       {
 	cups_printer_handle_attribute (cups_backend, attr, info);
         attr = attr->next;
       }
+#endif
 
       if (info->printer_name == NULL ||
 	  (info->printer_uri == NULL && info->member_uris == NULL))