Add testcases for file safety checking functions.

* libmailutils/tests/fsaf.at: New testcase.
* libmailutils/tests/fsaf.c: New file.
* libmailutils/tests/.gitignore: Add fsaf
* libmailutils/tests/Makefile.am: Likewise.
* libmailutils/tests/testsuite.at: Include fsaf.at.

 /* GNU Mailutils -- a suite of utilities for electronic mail
-   Copyright (C) 2011
-   Free Software Foundation, Inc.
+   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

@@ -11,6 +11,7 @@ debugspec
 decode2047
 encode2047
 fltst
+fsaf
 listop
 mailcap
 prop

@@ -46,6 +46,7 @@ noinst_PROGRAMS = \
  decode2047\
  encode2047\
  fltst\
+ fsaf\
  listop\
  mailcap\
  prop\
@@ -70,6 +71,7 @@ TESTSUITE_AT = \
  decode2047.at\
  encode2047.at\
  fromflt.at\
+ fsaf.at\
  hdrflt.at\
  inline-comment.at\
  linecon.at\

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2011 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils 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
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_BANNER(File Safety)
+
+dnl ------------------------------------------------------------
+dnl FSAF(CRITERIA, CODE, [STDOUT = `'], [RUN-IF-FAIL],
+dnl      [RUN-IF-PASS], [NAME])
+dnl
+
+m4_pushdef([FSAFCODE],[
+AT_SETUP([m4_if([$6],,$1,$6)])
+AT_KEYWORDS([fsaf])
+AT_CHECK([
+$2
+fsaf $1 file
+],
+[0],
+[file: $3
+],
+[],
+[$4],
+[$5])
+AT_CLEANUP
+])
+
+m4_pushdef([FSAF],[
+FSAFCODE([$1],
+[> file
+m4_if([$2],,,[chmod $2 file])],[$3],[$4],[$5],[$6])
+])
+
+dnl ------------------------------------------------------------
+
+FSAF([], [], [Success], [], [], [default])
+
+FSAF([+awrfil], [o+w], [World writable file])
+FSAF([+gwrfil], [g+w], [Group writable file])
+
+FSAFCODE([+linkwrdir],
+[mkdir dir
+chmod g+w dir
+> data
+cd dir
+ln ../data file
+],
+[Linked file in a writable directory])
+
+FSAFCODE([+awrdir],
+[mkdir dir
+chmod o+w dir
+cd dir
+> file
+],
+[File in world writable directory])
+
+FSAFCODE([+gwrdir],
+[mkdir dir
+chmod g+w dir
+cd dir
+> file
+],
+[File in group writable directory])
+
+FSAF([+ardfil], [o+r], [World readable file])
+FSAF([+grdfil], [g+r], [Group readable file])
+
+m4_popdef([FSAFCODE])
+m4_popdef([FSAF])

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   GNU Mailutils is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GNU Mailutils 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <mailutils/types.h>
+#include <mailutils/error.h>
+#include <mailutils/errno.h>
+#include <mailutils/util.h>
+
+int
+main (int argc, char **argv)
+{
+  int i;
+  int mode = MU_FILE_SAFETY_OWNER_MISMATCH, rc, m;
+  mu_list_t idlist;
+  uid_t uid;
+
+  if (argc == 1)
+    {
+      mu_error ("usage: %s [+-]mode... file...", argv[0]);
+      exit (1);
+    }
+  
+  rc = mu_list_create (&idlist);
+  if (rc)
+    {
+      mu_error ("mu_list_create: %s", mu_strerror (rc));
+      exit (1);
+    }
+  uid = getuid ();
+  
+  for (i = 1; i < argc; i++)
+    {
+      if (argv[i][0] == '-' || argv[i][0] == '+')
+	{
+	  rc = mu_file_safety_name_to_code (argv[i] + 1, &m);
+	  if (rc)
+	    {
+	      mu_error ("%s: %s", argv[i], mu_strerror (rc));
+	      exit (1);
+	    }
+	  if (argv[i][0] == '-')
+	    mode &= ~m;
+	  else
+	    mode |= m;
+	}
+      else
+	{
+	  rc = mu_file_safety_check (argv[i], mode, uid, idlist);
+	  printf ("%s: %s\n", argv[i], mu_strerror (rc));
+	}
+    }
+  exit (0);
+}

@@ -77,3 +77,4 @@ m4_include([hdrflt.at])
 m4_include([linecon.at])
 m4_include([debugspec.at])
 
+m4_include([fsaf.at])
\ No newline at end of file