From 1de3b177aafac15aa57933bda223ae6b6dbc1ed6 Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Mon, 14 Feb 2005 12:36:01 +0000
Subject: [PATCH] Made pspp fail a little more gracefully on drivers where
 charts are unsupported.

---
 src/box-whisker.c |  3 +++
 src/examine.q     |  2 +-
 src/plot-chart.c  |  3 ++-
 src/postscript.c  | 31 +++++++++++++++++++++++++++----
 4 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/src/box-whisker.c b/src/box-whisker.c
index 773de809..57930c86 100644
--- a/src/box-whisker.c
+++ b/src/box-whisker.c
@@ -212,6 +212,9 @@ boxplot_draw_yscale(struct chart *ch , double y_max, double y_min)
   double y_tick;
   double d;
 
+  if ( !ch ) 
+     return ;
+
   ch->y_max  = y_max;
   ch->y_min  = y_min;
 
diff --git a/src/examine.q b/src/examine.q
index f92bba1f..96d8210d 100644
--- a/src/examine.q
+++ b/src/examine.q
@@ -1777,7 +1777,7 @@ box_plot_group(const struct factor *fctr,
 				   s);
 	    }
 	}
-      else
+      else if ( ch )
 	{
 	  const double box_width = (ch->data_right - ch->data_left) / 3.0;
 	  const double box_centre = (ch->data_right + ch->data_left) / 2.0;
diff --git a/src/plot-chart.c b/src/plot-chart.c
index 795e3113..ae90a7e3 100644
--- a/src/plot-chart.c
+++ b/src/plot-chart.c
@@ -188,7 +188,8 @@ chart_submit(struct chart *chart)
 {
   struct som_entity s;
 
-  assert(chart);
+  if ( ! chart ) 
+     return ;
 
   pl_restorestate_r(chart->lp);
 
diff --git a/src/postscript.c b/src/postscript.c
index 7b1f6e15..ebad2472 100644
--- a/src/postscript.c
+++ b/src/postscript.c
@@ -2871,6 +2871,28 @@ load_font (struct outp_driver *this, const char *dit)
   return fe;
 }
 
+
+void ps_chart_initialise(struct outp_class *c UNUSED, 
+			    struct chart *ch UNUSED);
+
+void ps_chart_finalise(struct outp_class *c UNUSED, 
+			  struct chart *ch UNUSED);
+
+
+void
+ps_chart_initialise(struct outp_class *c UNUSED, struct chart *ch )
+{
+  msg(MW, _("Charts are currently unsupported with postscript drivers."));
+  ch->lp = 0;
+}
+
+void 
+ps_chart_finalise(struct outp_class *c UNUSED, struct chart *ch UNUSED)
+{
+  
+}
+
+
 /* PostScript driver class. */
 struct outp_class postscript_class =
 {
@@ -2911,8 +2933,8 @@ struct outp_class postscript_class =
   ps_text_metrics,
   ps_text_draw,
 
-  NULL,
-  NULL
+  ps_chart_initialise,
+  ps_chart_finalise
 };
 
 /* EPSF driver class.  FIXME: Probably doesn't work right. */
@@ -2955,8 +2977,9 @@ struct outp_class epsf_class =
   ps_text_metrics,
   ps_text_draw,
 
-  NULL,
-  NULL
+  ps_chart_initialise,
+  ps_chart_finalise
+
 };
 
 #endif /* NO_POSTSCRIPT */
-- 
2.30.2