[gtk+/gtk-3-4] Bug 670373: modules/printing/cups/gtkprintbackendcups.c won't build with CUPS 1.6

[John Ralls <jralls src gnome org>]

commit 4b3d566de1987531cefa731d8f6e7bd71f2ac997
Author: John Ralls <jralls ceridwen us>
Date:   Sun Feb 19 13:48:19 2012 -0800

    Bug 670373: 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 5d4e2af..af34eef 100644
--- a/modules/printbackends/cups/gtkprintbackendcups.c
+++ b/modules/printbackends/cups/gtkprintbackendcups.c
@@ -2000,7 +2000,29 @@ 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;
@@ -2016,12 +2038,12 @@ 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))