int MAIN(int argc, char **argv)
{
	char **args, *infile = NULL, *outfile = NULL;
	BIO *in = NULL, *out = NULL;
	int toseq = 0;
	X509 *x509 = NULL;
	NETSCAPE_CERT_SEQUENCE *seq = NULL;
	int i, ret = 1;
	int badarg = 0;
	if (bio_err == NULL) bio_err = BIO_new_fp (stderr, BIO_NOCLOSE);
	ERR_load_crypto_strings();
	args = argv + 1;
	while (!badarg && *args && *args[0] == '-') {
		if (!strcmp (*args, "-toseq")) toseq = 1;
		else if (!strcmp (*args, "-in")) {
			if (args[1]) {
				args++;
				infile = *args;
			} else badarg = 1;
		} else if (!strcmp (*args, "-out")) {
			if (args[1]) {
				args++;
				outfile = *args;
			} else badarg = 1;
		} else badarg = 1;
		args++;
	}

	if (badarg) {
		BIO_printf (bio_err, "Netscape certificate sequence utility\n");
		BIO_printf (bio_err, "Usage nseq [options]\n");
		BIO_printf (bio_err, "where options are\n");
		BIO_printf (bio_err, "-in file  input file\n");
		BIO_printf (bio_err, "-out file output file\n");
		BIO_printf (bio_err, "-toseq    output NS Sequence file\n");
		EXIT(1);
	}

	if (infile) {
		if (!(in = BIO_new_file (infile, "r"))) {
			BIO_printf (bio_err,
				 "Can't open input file %s\n", infile);
			goto end;
		}
	} else in = BIO_new_fp(stdin, BIO_NOCLOSE);

	if (outfile) {
		if (!(out = BIO_new_file (outfile, "w"))) {
			BIO_printf (bio_err,
				 "Can't open output file %s\n", outfile);
			goto end;
		}
	} else {
		out = BIO_new_fp(stdout, BIO_NOCLOSE);
#ifdef VMS
		{
		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
		out = BIO_push(tmpbio, out);
		}
#endif
	}
	if (toseq) {
		seq = NETSCAPE_CERT_SEQUENCE_new();
		seq->certs = sk_X509_new_null();
		while((x509 = PEM_read_bio_X509(in, NULL, NULL, NULL))) 
		    sk_X509_push(seq->certs,x509);

		if(!sk_X509_num(seq->certs))
		{
			BIO_printf (bio_err, "Error reading certs file %s\n", infile);
			ERR_print_errors(bio_err);
			goto end;
		}
		PEM_write_bio_NETSCAPE_CERT_SEQUENCE(out, seq);
		ret = 0;
		goto end;
	}

	if (!(seq = PEM_read_bio_NETSCAPE_CERT_SEQUENCE(in, NULL, NULL, NULL))) {
		BIO_printf (bio_err, "Error reading sequence file %s\n", infile);
		ERR_print_errors(bio_err);
		goto end;
	}

	for(i = 0; i < sk_X509_num(seq->certs); i++) {
		x509 = sk_X509_value(seq->certs, i);
		dump_cert_text(out, x509);
		PEM_write_bio_X509(out, x509);
	}
	ret = 0;
end:
	BIO_free(in);
	BIO_free_all(out);
	NETSCAPE_CERT_SEQUENCE_free(seq);

	EXIT(ret);
}