New file. Provides standard sieve tests (all noops, so far)

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+
+   This program 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, or (at your option)
+   any later version.
+
+   This program 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 program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif  
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>  
+#include <string.h>  
+#include <sieve.h>
+
+#define TAG_LOCALPART   0
+#define TAG_DOMAIN      1
+#define TAG_ALL         2
+#define TAG_COMPARATOR  3
+#define TAG_IS          4
+#define TAG_CONTAINS    5
+#define TAG_MATCHES     6  
+#define TAG_REGEX       7 
+#define TAG_UNDER       8
+#define TAG_OVER        9
+
+int
+sieve_test_address (sieve_machine_t *mach, list_t *args)
+{
+}
+
+int
+sieve_test_header (sieve_machine_t *mach, list_t *args)
+{
+}
+
+int
+sieve_test_envelope (sieve_machine_t *mach, list_t *args)
+{
+}
+
+int
+sieve_test_size (sieve_machine_t *mach, list_t *args)
+{
+}
+
+int
+sieve_test_true (sieve_machine_t *mach, list_t *args)
+{
+}
+
+int
+sieve_test_false (sieve_machine_t *mach, list_t *args)
+{
+}
+
+int
+sieve_test_exists (sieve_machine_t *mach, list_t *args)
+{
+}
+
+#define ADDRESS_PART \
+  { "localpart", TAG_LOCALPART, SVT_VOID },\
+  { "domain", TAG_DOMAIN, SVT_VOID },\
+  { "all", TAG_ALL, SVT_VOID }
+
+#define MATCH_PART \
+  { "is", TAG_IS, SVT_VOID },\
+  { "contains", TAG_CONTAINS, SVT_VOID },\
+  { "matches", TAG_MATCHES, SVT_VOID },\
+  { "regex", TAG_REGEX, SVT_VOID }
+
+#define COMP_PART \
+  { "comparator", TAG_COMPARATOR, SVT_STRING }
+
+#define SIZE_PART \
+  { "under", TAG_UNDER, SVT_VOID },\
+  { "over", TAG_OVER, SVT_VOID }
+    
+  
+sieve_tag_def_t address_tags[] = {
+  ADDRESS_PART,
+  COMP_PART,
+  MATCH_PART,
+  { NULL }
+};
+
+sieve_data_type address_req_args[] = {
+  SVT_STRING_LIST,
+  SVT_STRING_LIST,
+  SVT_VOID
+};
+
+sieve_tag_def_t size_tags[] = {
+  SIZE_PART,
+  { NULL }
+};
+
+sieve_data_type size_req_args[] = {
+  SVT_NUMBER,
+  SVT_VOID
+};
+
+sieve_tag_def_t envelope_tags[] = {
+  COMP_PART,
+  ADDRESS_PART,
+  MATCH_PART,
+  { NULL }
+};
+
+sieve_data_type exists_req_args[] = {
+  SVT_STRING_LIST,
+  SVT_VOID
+};
+
+sieve_tag_def_t header_tags[] = {
+  COMP_PART,
+  MATCH_PART,
+  { NULL },
+};
+
+void
+sieve_register_standard_tests ()
+{
+  sieve_register_test ("false", sieve_test_false, NULL, NULL, 1);
+  sieve_register_test ("true", sieve_test_false, NULL, NULL, 1);
+  sieve_register_test ("address", sieve_test_address,
+		       address_req_args, address_tags, 1);
+  sieve_register_test ("size", sieve_test_size,
+		       size_req_args, size_tags, 1);
+  sieve_register_test ("envelope", sieve_test_envelope,
+		       address_req_args, envelope_tags, 1);
+  sieve_register_test ("exists", sieve_test_exists,
+		       exists_req_args, NULL, 1);
+  sieve_register_test ("header", sieve_test_header,
+		       address_req_args, header_tags, 1);
+}