[gtk+/gtk-3-18] gtkprintoperation: job names must not exceed 255 chars

[Matthias Clasen <matthiasc src gnome org>]

commit 78a59caed9ffd95e73c2ccf957b808a061553084
Author: Felipe Borges <felipeborges gnome org>
Date:   Fri Oct 2 17:15:26 2015 +0200

    gtkprintoperation: job names must not exceed 255 chars
    
    According to http://datatracker.ietf.org/doc/rfc2911/, The 'name'
    attribute syntax is essentially the same as 'text', including the
    REQUIRED support of UTF-8 except that the sequence of characters
    is limited so that its encoded form MUST NOT exceed 255 (MAX) octets.
    
    CUPS will not print jobs with names exceeding 255 characters.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755988

 gtk/gtkprintoperation.c |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkprintoperation.c b/gtk/gtkprintoperation.c
index 6dc7fb2..9f4540b 100644
--- a/gtk/gtkprintoperation.c
+++ b/gtk/gtkprintoperation.c
@@ -1606,6 +1606,7 @@ gtk_print_operation_set_job_name (GtkPrintOperation *op,
                                  const gchar       *job_name)
 {
   GtkPrintOperationPrivate *priv;
+  gchar *end;
 
   g_return_if_fail (GTK_IS_PRINT_OPERATION (op));
   g_return_if_fail (job_name != NULL);
@@ -1613,7 +1614,25 @@ gtk_print_operation_set_job_name (GtkPrintOperation *op,
   priv = op->priv;
 
   g_free (priv->job_name);
-  priv->job_name = g_strdup (job_name);
+  /*
+   * according to http://datatracker.ietf.org/doc/rfc2911/,
+   * job names MUST NOT exceed 255 (MAX) octets.
+   *
+   * CUPS will not print jobs with names exceeding 255 chars.
+   */
+  if (strlen (job_name) > 255)
+    {
+      end = g_utf8_find_prev_char (job_name, job_name + 255);
+      priv->job_name = g_utf8_substring (job_name,
+                                         0,
+                                         g_utf8_pointer_to_offset (job_name,
+                                                                   end));
+    }
+  else
+    {
+      priv->job_name = g_strdup (job_name);
+    }
+
 
   g_object_notify (G_OBJECT (op), "job-name");
 }