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Rename struct ${app}_config to plain cfg

All the structs are static and we need to reach into them many times.
Having a shorter name is more concise and results in less visual clutter.
It also avoids many overlong lines and we will be able to get rid of some
unfortunate line wrapping down the road.

Discussed with jsing

/* $OpenBSD: pkeyparam.c,v 1.17 2023/03/06 14:32:06 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <string.h>

#include "apps.h"

#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>

static struct {
	int check;
	char *infile;
	int noout;
	char *outfile;
	int text;
} cfg;

static const struct option pkeyparam_options[] = {
	{
		.name = "check",
		.desc = "Check validity of key parameters",
		.type = OPTION_FLAG,
		.opt.flag = &cfg.check,
	},
	{
		.name = "in",
		.argname = "file",
		.desc = "Input file (default stdin)",
		.type = OPTION_ARG,
		.opt.arg = &cfg.infile,
	},
	{
		.name = "noout",
		.desc = "Do not print encoded version of the parameters",
		.type = OPTION_FLAG,
		.opt.flag = &cfg.noout,
	},
	{
		.name = "out",
		.argname = "file",
		.desc = "Output file (default stdout)",
		.type = OPTION_ARG,
		.opt.arg = &cfg.outfile,
	},
	{
		.name = "text",
		.desc = "Print out the parameters in plain text",
		.type = OPTION_FLAG,
		.opt.flag = &cfg.text,
	},
	{ NULL },
};

static void
pkeyparam_usage()
{
	fprintf(stderr,
	    "usage: pkeyparam [-check] [-in file] [-noout] [-out file] "
	    "[-text]\n");
	options_usage(pkeyparam_options);
}

int
pkeyparam_main(int argc, char **argv)
{
	BIO *in = NULL, *out = NULL;
	EVP_PKEY *pkey = NULL;
	int ret = 1;

	if (pledge("stdio cpath wpath rpath", NULL) == -1) {
		perror("pledge");
		exit(1);
	}

	memset(&cfg, 0, sizeof(cfg));

	if (options_parse(argc, argv, pkeyparam_options, NULL, NULL) != 0) {
		pkeyparam_usage();
		return (1);
	}

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

	if (cfg.outfile) {
		if (!(out = BIO_new_file(cfg.outfile, "w"))) {
			BIO_printf(bio_err, "Can't open output file %s\n",
			    cfg.outfile);
			goto end;
		}
	} else {
		out = BIO_new_fp(stdout, BIO_NOCLOSE);
	}

	pkey = PEM_read_bio_Parameters(in, NULL);
	if (!pkey) {
		BIO_printf(bio_err, "Error reading parameters\n");
		ERR_print_errors(bio_err);
		goto end;
	}

	if (cfg.check) {
		if (!pkey_check(out, pkey, EVP_PKEY_param_check, "Parameters"))
			goto end;
	}

	if (!cfg.noout)
		PEM_write_bio_Parameters(out, pkey);

	if (cfg.text)
		EVP_PKEY_print_params(out, pkey, 0, NULL);

	ret = 0;

 end:
	EVP_PKEY_free(pkey);
	BIO_free_all(out);
	BIO_free(in);

	return ret;
}