X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flanguage%2Futilities%2Fset.q;h=30f3c56e578fda7ed4c7b6ba79d5058c4bbb07ed;hb=e937634e9021aa0656a6362f169ec2183efed499;hp=3c0109cce89b4a1023640b08608a460934597dba;hpb=66946a0a0cab3a51e6fded95aef4e991baee319f;p=pspp

diff --git a/src/language/utilities/set.q b/src/language/utilities/set.q
index 3c0109cce8..30f3c56e57 100644
--- a/src/language/utilities/set.q
+++ b/src/language/utilities/set.q
@@ -923,6 +923,45 @@ cmd_show (struct lexer *lexer, struct dataset *ds)
 
   return CMD_SUCCESS;
 }
+
+#define MAX_SAVED_SETTINGS 5
+
+static struct settings *saved_settings[MAX_SAVED_SETTINGS];
+static int n_saved_settings;
+
+int
+cmd_preserve (struct lexer *lexer, struct dataset *ds UNUSED)
+{
+  if (n_saved_settings < MAX_SAVED_SETTINGS)
+    {
+      saved_settings[n_saved_settings++] = settings_get ();
+      return lex_end_of_command (lexer);
+    }
+  else
+    {
+      msg (SE, _("Too many PRESERVE commands without a RESTORE: at most "
+                 "%d levels of saved settings are allowed."),
+           MAX_SAVED_SETTINGS);
+      return CMD_CASCADING_FAILURE;
+    }
+}
+
+int
+cmd_restore (struct lexer *lexer, struct dataset *ds UNUSED)
+{
+  if (n_saved_settings > 0)
+    {
+      struct settings *s = saved_settings[--n_saved_settings];
+      settings_set (s);
+      settings_destroy (s);
+      return lex_end_of_command (lexer);
+    }
+  else
+    {
+      msg (SE, _("RESTORE without matching PRESERVE."));
+      return CMD_FAILURE;
+    }
+}
 
 /*
    Local Variables: