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[bpt/guile.git] / libguile / options.c

diff --git a/libguile/options.c b/libguile/options.c
index 412192f..0e08314 100644 (file)
--- a/libguile/options.c
+++ b/libguile/options.c
@@ -1,26 +1,29 @@
-/* Copyright (C) 1995,1996,1998,2000,2001, 2006 Free Software Foundation
+/* Copyright (C) 1995,1996,1998,2000,2001, 2006, 2008, 2009, 2010 Free Software Foundation
  * 
  * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
  */
 
 \f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
 
 #include "libguile/_scm.h"
 #include "libguile/mallocs.h"
 #include "libguile/strings.h"
-#include "libguile/lang.h"
 
 #include "libguile/options.h"
 \f
@@ -145,7 +148,7 @@ get_documented_option_setting (const scm_t_option options[])
       ls = scm_cons (SCM_PACK (options[i].name), ls);
       ans = scm_cons (ls, ans);
     }
-  return ans;
+  return scm_reverse_x (ans, SCM_UNDEFINED);
 }
 
 
@@ -164,9 +167,14 @@ options_length (scm_t_option options[])
  * formed option setting, i. e. if for every non-boolean option a value is
  * given.  For this reason, the function applies all changes to a copy of the
  * original setting in memory.  Only if 'args' was successfully processed,
- * the new setting will overwrite the old one.  */
+ * the new setting will overwrite the old one.
+ *
+ * If DRY_RUN is set, don't change anything. This is useful for trying out an option
+ * before entering a critical section.
+ */
 static void
-change_option_setting (SCM args, scm_t_option options[], const char *s)
+change_option_setting (SCM args, scm_t_option options[], const char *s,
+                      int dry_run)
 {
   unsigned int i;
   SCM locally_protected_args = args;
@@ -214,6 +222,9 @@ change_option_setting (SCM args, scm_t_option options[], const char *s)
       args = SCM_CDR (args);
     }
 
+  if (dry_run)
+    return;
+  
   for (i = 0; options[i].name; ++i)
     {
       if (options[i].type == SCM_OPTION_SCM)
@@ -234,6 +245,13 @@ change_option_setting (SCM args, scm_t_option options[], const char *s)
 
 SCM
 scm_options (SCM args, scm_t_option options[], const char *s)
+{
+  return scm_options_try (args, options, s, 0);
+}
+       
+SCM
+scm_options_try (SCM args, scm_t_option options[], const char *s,
+                int dry_run)
 {
   if (SCM_UNBNDP (args))
     return get_option_setting (options);
@@ -247,7 +265,7 @@ scm_options (SCM args, scm_t_option options[], const char *s)
       SCM old_setting;
       SCM_ASSERT (scm_is_true (scm_list_p (args)), args, 1, s);
       old_setting = get_option_setting (options);
-      change_option_setting (args, options, s);
+      change_option_setting (args, options, s, dry_run);
       return old_setting;
     }
 }
@@ -262,7 +280,6 @@ scm_init_opts (SCM (*func) (SCM), scm_t_option options[])
     {
       SCM name = scm_from_locale_symbol (options[i].name);
       options[i].name =        (char *) SCM_UNPACK (name);
-      scm_permanent_object (name);
     }
   func (SCM_UNDEFINED);
 }