X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fui%2Fgui%2Fhelper.h;h=597fdd78b48171c68098950879b8379491815475;hb=90a008db8b2f6e5bec903e584eb68e9bb20c061e;hp=f7660dc43b8332f674e664202dfe76fdc198e418;hpb=0c5217288cb57d0994d4c99997f5341e2c3a6871;p=pspp

diff --git a/src/ui/gui/helper.h b/src/ui/gui/helper.h
index f7660dc43b..597fdd78b4 100644
--- a/src/ui/gui/helper.h
+++ b/src/ui/gui/helper.h
@@ -1,5 +1,5 @@
 /* PSPPIRE - a graphical user interface for PSPP.
-   Copyright (C) 2004, 2009, 2010  Free Software Foundation
+   Copyright (C) 2004, 2009, 2010, 2011  Free Software Foundation
 
    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
@@ -33,15 +33,26 @@ gchar *paste_syntax_to_window (gchar *syntax);
 
 struct fmt_spec;
 
+/* Returns a new GParamSpec for a string.  An attempt to store the empty string
+   in the parameter will be silently translated into storing a null pointer. */
+static inline GParamSpec *
+null_if_empty_param (const gchar *name, const gchar *nick,
+                     const gchar *blurb, const gchar *default_value,
+                     GParamFlags flags)
+{
+  GParamSpec *param;
 
-/* Formats a value according to FORMAT
-   The returned string must be freed when no longer required */
-gchar * value_to_text (union value v, const PsppireDict *dict, struct fmt_spec format);
+  param = g_param_spec_string (name, nick, blurb, default_value, flags);
+  ((GParamSpecString *) param)->null_fold_if_empty = TRUE;
+  return param;
+}
+
+
+gchar * value_to_text (union value v, const struct variable *);
 
 
 union value *
 text_to_value (const gchar *text,
-	       const PsppireDict *dict,
 	       const struct variable *var,
 	       union value *);