New function: debug_printv() to complement debug_print().

@@ -45,6 +45,8 @@ extern int debug_set_level __P ((debug_t, size_t level));
 extern int debug_get_level __P ((debug_t, size_t *plevel));
 extern int debug_print     __P ((debug_t debug, size_t level,
 				 const char *format, ...));
+extern int debug_printv    __P ((debug_t debug, size_t level,
+				 const char *format, va_list argp));
 extern int debug_set_print __P ((debug_t, int (*_print) __P ((debug_t, const char *, va_list)), void *owner));
 
 #ifdef __cplusplus

@@ -98,17 +98,29 @@ debug_print (debug_t debug, size_t level, const char *format, ...)
 {
   va_list ap;
 
+  va_start (ap, format);
+
+  debug_printv (debug, level, format, ap);
+  
+  va_end (ap);
+
+  return 0;
+}
+
+int
+debug_printv (debug_t debug, size_t level, const char *format, va_list ap)
+{
   if (debug == NULL || format == NULL)
     return EINVAL;
 
   if (!(debug->level & level))
     return 0;
 
-  va_start (ap, format);
   if (debug->_print)
     debug->_print (debug, format, ap);
   else
     vfprintf (stderr, format, ap);
-  va_end (ap);
+
   return 0;
 }
+