X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdata%2Fsession.c;h=ae37c76b945c8ae9c69288313f69db41d5b24c15;hb=491cd3744c11da45ac6e41c734e4a33c19b060c9;hp=c6f5031a5379e79a33cd84e6428b3d8ed2eeca1a;hpb=6f3865480503c571963d8a2d1af858a4d72d4e88;p=pspp

diff --git a/src/data/session.c b/src/data/session.c
index c6f5031a53..ae37c76b94 100644
--- a/src/data/session.c
+++ b/src/data/session.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2010, 2011, 2012 Free Software Foundation, Inc.
+   Copyright (C) 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -33,6 +33,7 @@
 
 struct session
   {
+    struct session *parent;
     struct hmapx datasets;
     struct dataset *active;
     char *syntax_encoding;      /* Default encoding for syntax files. */
@@ -43,14 +44,16 @@ static struct hmapx_node *session_lookup_dataset__ (const struct session *,
                                                     const char *name);
 
 struct session *
-session_create (void)
+session_create (struct session *parent)
 {
   struct session *s;
 
   s = xmalloc (sizeof *s);
+  s->parent = parent;
   hmapx_init (&s->datasets);
   s->active = NULL;
-  s->syntax_encoding = xstrdup ("Auto");
+  s->syntax_encoding = xstrdup (s->parent != NULL
+                                ? s->parent->syntax_encoding : "Auto");
   s->n_dataset_names = 0;
   return s;
 }
@@ -66,6 +69,7 @@ session_destroy (struct session *s)
       s->active = NULL;
       HMAPX_FOR_EACH_SAFE (ds, node, next, &s->datasets)
         dataset_destroy (ds);
+      hmapx_destroy (&s->datasets);
       free (s->syntax_encoding);
       free (s);
     }
@@ -93,7 +97,10 @@ session_add_dataset (struct session *s, struct dataset *ds)
   if (old == s->active)
     s->active = ds;
   if (old != NULL)
-    session_remove_dataset (s, old);
+    {
+      session_remove_dataset (s, old);
+      dataset_destroy (old);
+    }
 
   hmapx_insert (&s->datasets, ds,
                 utf8_hash_case_string (dataset_name (ds), 0));
@@ -115,7 +122,9 @@ struct dataset *
 session_lookup_dataset (const struct session *s, const char *name)
 {
   struct hmapx_node *node = session_lookup_dataset__ (s, name);
-  return node != NULL ? node->data : NULL;
+  return (node != NULL ? node->data
+          : s->parent != NULL ? session_lookup_dataset (s->parent, name)
+          : NULL);
 }
 
 struct dataset *