A test program for filter_iconv

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2004 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 2, 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <assert.h>
+
+#include <mailutils/mailutils.h>
+
+int
+main (int argc, char **argv)
+{
+  int rc;
+  stream_t in, out;
+  stream_t cvt;
+  size_t total = 0, size;
+  char buffer[80];
+  
+  if (argc != 3)
+    {
+      fprintf (stderr, "usage: %s from-code to-code\n", argv[0]);
+      return 1;
+    }
+
+  rc = stdio_stream_create (&in, stdin, 0);
+  assert (rc == 0);
+  assert (stream_open (in) == 0);
+  assert (filter_iconv_create (&cvt, in, argv[1], argv[2], 0) == 0);
+  assert (stream_open (cvt) == 0);
+  
+  rc = stdio_stream_create (&out, stdout, 0);
+  assert (rc == 0);
+  assert (stream_open (out) == 0);
+
+  while ((rc = stream_read (cvt, buffer, sizeof (buffer), total, &size)) == 0
+	 && size > 0)
+    {
+      stream_sequential_write (out, buffer, size);
+      total += size;
+    }
+  stream_flush (out);
+  if (rc)
+    {
+      char *p;
+      stream_strerror (cvt, &p);
+      fprintf (stderr, "error: %s / %s\n", mu_strerror (rc), p);
+    }
+  return 0;
+}