/*	$NetBSD: mkdevsw.c,v 1.7 2009/01/20 18:20:48 drochner Exp $	*/

/*
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by MAEKAWA Masahide (gehenna@NetBSD.org).
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS 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 FOUNDATION OR 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

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

#include "defs.h"

static void emitconv(FILE *);
static void emitdev(FILE *);
static void emitdevm(FILE *);
static void emitheader(FILE *);

int
mkdevsw(void)
{
	FILE *fp;

	if ((fp = fopen("devsw.c.tmp", "w")) == NULL) {
		warn("cannot create devsw.c");
		return (1);
	}

	emitheader(fp);
	emitdevm(fp);
	emitconv(fp);
	emitdev(fp);

	fflush(fp);
	if (ferror(fp)) {
		warn("error writing devsw.c");
		fclose(fp);
		return 1;
	}

	(void)fclose(fp);

	if (moveifchanged("devsw.c.tmp", "devsw.c") != 0) {
		warn("error renaming devsw.c");
		return (1);
	}

	return (0);
}

static void
emitheader(FILE *fp)
{
	autogen_comment(fp, "devsw.c");

	fputs("#include <sys/param.h>\n"
		  "#include <sys/conf.h>\n"
		  "\n#define\tDEVSW_ARRAY_SIZE(x)\t"
		  "(sizeof((x))/sizeof((x)[0]))\n", fp);
}

/*
 * Emit device switch table for character/block device.
 */
static void
emitdevm(FILE *fp)
{
	struct devm *dm;
	char mstr[16];
	devmajor_t i;

	fputs("\n/* device switch table for block device */\n", fp);

	for (i = 0 ; i <= maxbdevm ; i++) {
		(void)snprintf(mstr, sizeof(mstr), "%d", i);
		if ((dm = ht_lookup(bdevmtab, intern(mstr))) == NULL)
			continue;

		fprintf(fp, "extern const struct bdevsw %s_bdevsw;\n",
			    dm->dm_name);
	}

	fputs("\nconst struct bdevsw *bdevsw0[] = {\n", fp);

	for (i = 0 ; i <= maxbdevm ; i++) {
		(void)snprintf(mstr, sizeof(mstr), "%d", i);
		if ((dm = ht_lookup(bdevmtab, intern(mstr))) == NULL) {
			fprintf(fp, "\tNULL,\n");
		} else {
			fprintf(fp, "\t&%s_bdevsw,\n", dm->dm_name);
		}
	}

	fputs("};\n\nconst struct bdevsw **bdevsw = bdevsw0;\n", fp);

	fputs("const int sys_bdevsws = DEVSW_ARRAY_SIZE(bdevsw0);\n"
		  "int max_bdevsws = DEVSW_ARRAY_SIZE(bdevsw0);\n", fp);

	fputs("\n/* device switch table for character device */\n", fp);

	for (i = 0 ; i <= maxcdevm ; i++) {
		(void)snprintf(mstr, sizeof(mstr), "%d", i);
		if ((dm = ht_lookup(cdevmtab, intern(mstr))) == NULL)
			continue;

		fprintf(fp, "extern const struct cdevsw %s_cdevsw;\n",
			    dm->dm_name);
	}

	fputs("\nconst struct cdevsw *cdevsw0[] = {\n", fp);

	for (i = 0 ; i <= maxcdevm ; i++) {
		(void)snprintf(mstr, sizeof(mstr), "%d", i);
		if ((dm = ht_lookup(cdevmtab, intern(mstr))) == NULL) {
			fprintf(fp, "\tNULL,\n");
		} else {
			fprintf(fp, "\t&%s_cdevsw,\n", dm->dm_name);
		}
	}

	fputs("};\n\nconst struct cdevsw **cdevsw = cdevsw0;\n", fp);

	fputs("const int sys_cdevsws = DEVSW_ARRAY_SIZE(cdevsw0);\n"
		  "int max_cdevsws = DEVSW_ARRAY_SIZE(cdevsw0);\n", fp);
}

/*
 * Emit device major conversion table.
 */
static void
emitconv(FILE *fp)
{
	struct devm *dm;

	fputs("\n/* device conversion table */\n"
		  "struct devsw_conv devsw_conv0[] = {\n", fp);
	TAILQ_FOREACH(dm, &alldevms, dm_next) {
		fprintf(fp, "\t{ \"%s\", %d, %d },\n", dm->dm_name,
			    dm->dm_bmajor, dm->dm_cmajor);
	}
	fputs("};\n\n"
		  "struct devsw_conv *devsw_conv = devsw_conv0;\n"
		  "int max_devsw_convs = DEVSW_ARRAY_SIZE(devsw_conv0);\n",
		  fp);
}

/*
 * Emit specific device major informations.
 */
static void
emitdev(FILE *fp)
{
	struct devm *dm;
	char mstr[16];

	fputs("\n", fp);

	(void)strlcpy(mstr, "swap", sizeof(mstr));
	if ((dm = ht_lookup(bdevmtab, intern(mstr))) != NULL) {
		fprintf(fp, "const dev_t swapdev = makedev(%d, 0);\n",
			    dm->dm_bmajor);
	}

	(void)strlcpy(mstr, "mem", sizeof(mstr));
	if ((dm = ht_lookup(cdevmtab, intern(mstr))) == NULL)
		panic("memory device is not configured");
	fprintf(fp, "const dev_t zerodev = makedev(%d, DEV_ZERO);\n",
		    dm->dm_cmajor);

	fputs("\n/* mem_no is only used in iskmemdev() */\n", fp);
	fprintf(fp, "const int mem_no = %d;\n", dm->dm_cmajor);
}