Scheme: add primitives for manipulating the MU debug levels.

* include/mailutils/debug.h (mu_debug_get_iterator): New proto.
* libmailutils/diag/debug.c (mu_debug_get_iterator): New function.
* libmu_scm/Makefile.am (lib_LTLIBRARIES): Add mu_debug.c.

* include/mailutils/guile.h (mu_scm_debug_init): New proto.
* libmu_scm/mu_scm.c (mu-register-format): Bugfix.
(mu_scm_init): Call mu_scm_debug_init.

@@ -84,6 +84,8 @@ void mu_debug_log_cont (const char *fmt, ...) MU_PRINTFLIKE(1,2);
 void mu_debug_log_end (const char *fmt, ...) MU_PRINTFLIKE(1,2);
 void mu_debug_log_nl (void);
 
+  int mu_debug_get_iterator (mu_iterator_t *piterator, int skipunset);
+
   
 #define MU_ASSERT(expr)						\
  do								\

@@ -72,6 +72,7 @@ extern void mu_scm_mutil_init (void);
 SCM mu_scm_make_debug_port (int level);
 void mu_scm_debug_port_init (void);
 
+extern void mu_scm_debug_init (void);
 
 extern void mu_guile_init (int debug);
 extern int mu_guile_load (const char *filename, int argc, char **argv);

@@ -146,7 +146,7 @@ mu_iterator_dup (mu_iterator_t *piterator, mu_iterator_t orig)
   if (status)
     return status;
 
-  status = orig->dup(&iterator->owner, orig->owner);
+  status = orig->dup (&iterator->owner, orig->owner);
   if (status)
     {
       free (iterator);

@@ -32,6 +32,8 @@
 #include <mailutils/wordsplit.h>
 #include <mailutils/stream.h>
 #include <mailutils/stdstream.h>
+#include <mailutils/iterator.h>
+#include <mailutils/cstr.h>
 
 int mu_debug_line_info;          /* Debug messages include source locations */
 
@@ -497,6 +499,176 @@ mu_debug_format_spec (mu_stream_t str, const char *names, int showunset)
 }
 
 
+/* Iterator */
+
+static mu_iterator_t iterator_head;
+
+#define ITR_BACKWARDS 0x01
+#define ITR_SKIPUNSET 0x02
+#define ITR_FINISHED  0x04
+
+struct debug_iterator
+{
+  size_t pos;
+  int flags;
+};
+
+static int
+first (void *owner)
+{
+  struct debug_iterator *itr = owner;
+  itr->flags &= ~ITR_FINISHED;
+  if (itr->flags & ITR_BACKWARDS)
+    itr->pos = catcnt - 1;
+  else
+    itr->pos = 0;
+  return 0;
+}
+
+static int
+next (void *owner)
+{
+  struct debug_iterator *itr = owner;
+  itr->flags &= ~ITR_FINISHED;
+  do
+    {
+      if (itr->flags & ITR_BACKWARDS)
+	{
+	  if (itr->pos)
+	    itr->pos--;
+	  else
+	    itr->flags |= ITR_FINISHED;
+	}
+      else
+	{
+	  if (itr->pos < catcnt - 1)
+	    itr->pos++;
+	  else
+	    itr->flags |= ITR_FINISHED;
+	}
+    }
+  while ((itr->flags & ITR_SKIPUNSET) &&
+	 !(itr->flags & ITR_FINISHED) &&
+	 !cattab[itr->pos].isset);
+
+  return 0;
+}
+
+static int
+getitem (void *owner, void **pret, const void **pkey)
+{
+  struct debug_iterator *itr = owner;
+  *(mu_debug_level_t*) pret = cattab[itr->pos].level;
+  if (pkey)
+    *pkey = cattab[itr->pos].name;
+  return 0;
+}
+
+static int
+finished_p (void *owner)
+{
+  struct debug_iterator *itr = owner;
+  return itr->flags & ITR_FINISHED;
+}
+
+static int
+curitem_p (void *owner, void *item)
+{
+  struct debug_iterator *itr = owner;
+  return mu_c_strcasecmp (cattab[itr->pos].name, (char *) item) == 0;
+}
+
+static int
+list_data_dup (void **ptr, void *owner)
+{
+  *ptr = malloc (sizeof (struct debug_iterator));
+  if (*ptr == NULL)
+    return ENOMEM;
+  memcpy (*ptr, owner, sizeof (struct debug_iterator));
+  return 0;
+}
+
+static int
+list_itrctl (void *owner, enum mu_itrctl_req req, void *arg)
+{
+  struct debug_iterator *itr = owner;
+  
+  switch (req)
+    {
+    case mu_itrctl_tell:
+      /* Return current position in the object */
+      if (!arg)
+	return EINVAL;
+      *(size_t*)arg = itr->pos;
+      break;
+
+    case mu_itrctl_delete:
+    case mu_itrctl_delete_nd:
+      /* Delete current element */
+      cattab[itr->pos].level = 0;
+      cattab[itr->pos].isset = 0;
+      break;
+
+    case mu_itrctl_replace:
+    case mu_itrctl_replace_nd:
+      if (!arg)
+	return EINVAL;
+      cattab[itr->pos].level = *(mu_debug_level_t*)arg;
+      break;
+
+    case mu_itrctl_qry_direction:
+      if (!arg)
+	return EINVAL;
+      else
+	*(int*)arg = itr->flags & ITR_BACKWARDS;
+      break;
+
+    case mu_itrctl_set_direction:
+      if (!arg)
+	return EINVAL;
+      else
+	itr->flags |= ITR_BACKWARDS;
+      break;
+
+    default:
+      return ENOSYS;
+    }
+  return 0;
+}
+
+int
+mu_debug_get_iterator (mu_iterator_t *piterator, int skipunset)
+{
+  int status;
+  mu_iterator_t iterator;
+  struct debug_iterator *itr;
+  
+  itr = malloc (sizeof *itr);
+  if (!itr)
+    return ENOMEM;
+  itr->pos = 0;
+  itr->flags = skipunset ? ITR_SKIPUNSET : 0;
+  status = mu_iterator_create (&iterator, itr);
+  if (status)
+    {
+      free (itr);
+      return status;
+    }
+
+  mu_iterator_set_first (iterator, first);
+  mu_iterator_set_next (iterator, next);
+  mu_iterator_set_getitem (iterator, getitem);
+  mu_iterator_set_finished_p (iterator, finished_p);
+  mu_iterator_set_curitem_p (iterator, curitem_p);
+  mu_iterator_set_dup (iterator, list_data_dup);
+  mu_iterator_set_itrctl (iterator, list_itrctl);
+  
+  mu_iterator_attach (&iterator_head, iterator);
+
+  *piterator = iterator;
+  return 0;
+}
+
 
 void
 mu_debug_log (const char *fmt, ...)

@@ -24,6 +24,7 @@ lib_LTLIBRARIES=libmu_scm.la
 C_SRCS=\
  mu_address.c\
  mu_body.c\
+ mu_debug.c\
  mu_dbgport.c\
  mu_guile.c\
  mu_mailbox.c\

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   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 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
+   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, see
+   <http://www.gnu.org/licenses/>. */
+
+#include "mu_scm.h"
+#include <mailutils/iterator.h>
+#include <mailutils/stdstream.h>
+
+SCM_DEFINE_PUBLIC (scm_mu_debug_parse, "mu-debug-parse", 1, 0, 0,
+		   (SCM spec),
+"Parses @var{spec} and sets MU debugging level according to it.")
+#define FUNC_NAME s_scm_mu_debug_parse
+{
+  char *s;
+  
+  SCM_ASSERT (scm_is_string (spec), spec, SCM_ARG1, FUNC_NAME);
+  s = scm_to_locale_string (spec);
+  mu_debug_parse_spec (s);
+  free (s);
+  return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+static int
+string_member_p (SCM list, SCM x)
+{
+  return scm_member (x, list) != SCM_BOOL_F;
+} 
+
+SCM_DEFINE_PUBLIC (scm_mu_debug_set, "mu-debug-set", 1, 0, 0,
+		   (SCM catlist),
+"Sets MU debug level according to @var{catlist}, which is a list of\n"
+"conses: (cons category level)\n")  
+#define FUNC_NAME s_scm_mu_debug_set
+{
+  SCM_ASSERT (scm_is_pair (catlist), catlist, SCM_ARG1, FUNC_NAME);
+  for (; !scm_is_null (catlist); catlist = SCM_CDR (catlist))
+    {
+      SCM cell = SCM_CAR (catlist);
+      SCM x;
+      char *name;
+      mu_debug_level_t lev;
+
+      SCM_ASSERT (scm_is_pair (cell), cell, SCM_ARGn, FUNC_NAME);
+      x = scm_car (cell);
+      SCM_ASSERT (scm_is_string (x), x, SCM_ARGn, FUNC_NAME);
+      name = scm_to_locale_string (x);
+      x = scm_cdr (cell);
+      SCM_ASSERT (scm_is_integer (x), x, SCM_ARGn, FUNC_NAME);
+      lev = scm_to_int (x);
+      if (lev == 0)
+	mu_debug_disable_category (name, strlen (name));
+      else
+	mu_debug_enable_category (name, strlen (name), lev);
+      free (name);
+    }      
+  return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE_PUBLIC (scm_mu_debug_get, "mu-debug-get", 0, 2, 0,
+		   (SCM catlist, SCM skipunset),
+"Returns a list of MU debugging categories with corresponding levels.\n"
+"If @var{catlist} is supplied, it is a list of category names.  In this case\n"
+"only categories from this list are returned")
+#define FUNC_NAME s_scm_mu_debug_get
+{
+  int skipunset_flag = 0;
+  mu_iterator_t itr;
+  SCM head = SCM_EOL, tail = SCM_EOL;
+  int (*member_p) (SCM list, SCM needle);
+
+  if (SCM_UNBNDP (catlist) || catlist == SCM_BOOL_F)
+    member_p = NULL;
+  else
+    {
+      SCM_ASSERT (scm_is_pair (catlist), catlist, SCM_ARG1, FUNC_NAME);
+      member_p = string_member_p;
+    }
+  
+  if (!SCM_UNBNDP (skipunset))
+    {
+      SCM_ASSERT (scm_is_bool (skipunset), skipunset, SCM_ARG2, FUNC_NAME);
+      skipunset_flag = skipunset == SCM_BOOL_T;
+    }
+
+  mu_debug_get_iterator (&itr, skipunset_flag);
+  for (mu_iterator_first (itr); !mu_iterator_is_done (itr);
+       mu_iterator_next (itr))
+    {
+      const char *name;
+      mu_debug_level_t level;
+      SCM scm_name;
+      
+      mu_iterator_current_kv (itr, (const void**) &name, (void**) &level);
+      scm_name = scm_from_locale_string (name);
+      if (!member_p || member_p (catlist, scm_name))
+	{
+	  SCM scm_new = scm_cons (scm_cons (scm_name,
+					    scm_from_uintmax (level)),
+				  SCM_EOL);
+
+	  if (scm_is_null (head))
+	    head = tail = scm_new;
+	  else
+	    {
+	      SCM_SETCDR (tail, scm_new);
+	      tail = scm_new;
+	    }
+	}
+    }
+  mu_iterator_destroy (&itr);
+  return head;
+}
+#undef FUNC_NAME
+
+void
+mu_scm_debug_init ()
+{
+#include "mu_debug.x"
+}

@@ -128,7 +128,7 @@ SCM_DEFINE_PUBLIC (scm_mu_register_format, "mu-register-format", 0, 0, 1,
 	  SCM_ASSERT (scm_is_string (scm), scm, SCM_ARGn, FUNC_NAME);
 	  s = scm_to_locale_string (scm);
 	  status = register_format (s);
-	  free (scm);
+	  free (s);
 	  if (status)
 	    mu_scm_error (FUNC_NAME, status,
 			  "Cannot register format ~A",
@@ -210,6 +210,7 @@ mu_scm_init ()
   mu_scm_port_init ();
   mu_scm_mime_init ();
   mu_scm_debug_port_init ();
+  mu_scm_debug_init ();
   
 #include "mu_scm.x"