sieve: bugfixes

* include/mailutils/sieve.h (mu_sieve_debug_handle): New declaration.
(mu_sieve_debug_init): New prototype.
* libmu_sieve/conf.c (mu_sieve_debug_handle): New global.
(mu_sieve_module_init): Call mu_sieve_debug_init.
* libmu_sieve/extensions/spamd.c (spamd_connect_tcp)
(spamd_connect_socket): Fix stream creation.
(spamd_send_message): Switch to full buffering on the transport
stream and indicate it is a payload (in case transcript is enabled),
before copying data.  Restore things to their original state afterwards.
(spamd_read_line): Rewrite using mu_stream_getline.
(decode_float): Additional argument endp. Unless NULL, store there the
position in the input string where the parsing has stopped.
(parse_response_line): New function.
(spamd_test): Rewrite using new API.
* sieve/sieve.c (parser): --dry-run implies --verbose.

* libmailutils/filter/base64.c (_base64_decoder): when not enough data
are available and cmd is not mu_filter_lastbuf, return mu_filter_lastbuf.
* libmailutils/stream/stream.c (mu_stream_shutdown): Flush the buffers before
shutting the transport down.

* libmailutils/tests/fltst.c (main): New option bufsize=

@@ -82,7 +82,7 @@ usage (const char *diag)
     fp = stdout;
 
   fprintf (fp, "%s",
-	   "usage: fltst FILTER {encode|decode} {read|write} [shift=N] [verbose] [printable] [nl] [-- args]\n");
+	   "usage: fltst FILTER {encode|decode} {read|write} [shift=N] [verbose] [printable] [nl] [bufsize=N] [-- args]\n");
   exit (diag ? 1 : 0);
 }
 
@@ -96,6 +96,7 @@ main (int argc, char * argv [])
   char *fltname;
   mu_off_t shift = 0;
   int newline_option = 0;
+  size_t bufsize = 0;
   
   if (argc == 1)
     usage (NULL);
@@ -122,6 +123,8 @@ main (int argc, char * argv [])
     {
       if (strncmp (argv[i], "shift=", 6) == 0)
 	shift = strtoul (argv[i] + 6, NULL, 0);
+      else if (strncmp (argv[i], "bufsize=", 8) == 0)
+	bufsize = strtoul (argv[i] + 8, NULL, 0);
       else if (strcmp (argv[i], "verbose") == 0)
 	verbose++;
       else if (strcmp (argv[i], "printable") == 0)
@@ -141,6 +144,8 @@ main (int argc, char * argv [])
   argv += i;
   
   MU_ASSERT (mu_stdio_stream_create (&in, MU_STDIN_FD, 0));
+  if (bufsize)
+    mu_stream_set_buffer (in, mu_buffer_full, bufsize);
   MU_ASSERT (mu_stdio_stream_create (&out, MU_STDOUT_FD, 0));
 
   if (flags == MU_STREAM_READ)
@@ -150,6 +155,8 @@ main (int argc, char * argv [])
 					mode,
 					MU_STREAM_READ|MU_STREAM_SEEK));
       mu_stream_unref (in);
+      if (bufsize)
+	mu_stream_set_buffer (flt, mu_buffer_full, bufsize);
       if (shift)
 	MU_ASSERT (mu_stream_seek (flt, shift, MU_SEEK_SET, NULL));
       c_copy (out, flt);
@@ -160,6 +167,8 @@ main (int argc, char * argv [])
 					argc, (const char **)argv,
 					mode,
 					MU_STREAM_WRITE));
+      if (bufsize)
+	mu_stream_set_buffer (flt, mu_buffer_full, bufsize);
       if (shift)
 	MU_ASSERT (mu_stream_seek (in, shift, MU_SEEK_SET, NULL));
       c_copy (flt, in);