From 811bf5664a4d5a46b7734bfeab4379ecc357acef Mon Sep 17 00:00:00 2001
From: rlar <rlar>
Date: Fri, 21 Sep 2012 21:15:41 +0200
Subject: [PATCH] destroy `const' plot in com_quit()

---
 src/frontend/misccoms.c |  1 +
 src/frontend/postcoms.c | 24 ++++++++++++++++++++++++
 src/frontend/postcoms.h |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/src/frontend/misccoms.c b/src/frontend/misccoms.c
index 7454b279b..e0e412a65 100644
--- a/src/frontend/misccoms.c
+++ b/src/frontend/misccoms.c
@@ -79,6 +79,7 @@ com_quit(wordlist *wl)
     destroy_ivars();
 
     byemesg();
+    destroy_const_plot();
     exit(exitcode);
 }
 
diff --git a/src/frontend/postcoms.c b/src/frontend/postcoms.c
index 7dc45b296..6a5c839c9 100644
--- a/src/frontend/postcoms.c
+++ b/src/frontend/postcoms.c
@@ -22,6 +22,7 @@ Author: 1985 Wayne A. Christopher, U. C. Berkeley CAD Group
 #include "quote.h"
 #include "variable.h"
 #include "parser/complete.h" /* va: throwaway */
+#include "plotting/plotting.h"
 
 
 static void killplot(struct plot *pl);
@@ -856,6 +857,29 @@ killplot(struct plot *pl)
 }
 
 
+void
+destroy_const_plot(void)
+{
+    struct dvec *v, *nv = NULL;
+    struct plot *pl = &constantplot;
+
+    /*  pl_dvecs, pl_scale */
+    for (v = pl->pl_dvecs; v; v = nv) {
+        nv = v->v_next;
+        vec_free(v);
+    }
+    wl_free(pl->pl_commands);
+    if (pl->pl_ccom)    /* va: also tfree (memory leak) */
+        throwaway(pl->pl_ccom);
+
+    if (pl->pl_env) { /* The 'environment' for this plot. */
+        /* va: HOW to do? */
+        printf("va: killplot should tfree pl->pl_env=(%p)\n", pl->pl_env);
+        fflush(stdout);
+    }
+}
+
+
 /* delete all windows with graphs dedrived from a given plot */
 static void
 DelPlotWindows(struct plot *pl)
diff --git a/src/frontend/postcoms.h b/src/frontend/postcoms.h
index 105305b6c..e6ff112db 100644
--- a/src/frontend/postcoms.h
+++ b/src/frontend/postcoms.h
@@ -16,5 +16,7 @@ void com_cross(wordlist *wl);
 void com_destroy(wordlist *wl);
 void com_splot(wordlist *wl);
 
+void destroy_const_plot(void);
+
 
 #endif