/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  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 acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)mkheaders.c	8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

/*
 * Make all the .h files for the optional entries
 */

#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <sys/param.h>
#include "config.h"
#include "y.tab.h"

static int do_header(char *, int);
static char *toheader(char *);
static char *tomacro(char *);

void
headers(void)
{
	struct file_list *fl;
	struct device *dp;
	int match;
	int errors;

	errors = 0;
	STAILQ_FOREACH(fl, &ftab, f_next) {
		if (fl->f_needs != 0) {
			match = 0;
			STAILQ_FOREACH(dp, &dtab, d_next) {
				if (eq(dp->d_name, fl->f_needs)) {
					match++;
					dp->d_done |= DEVDONE;
				}
			}
			if (fl->f_flags & NEED_COUNT)
				errors += do_header(fl->f_needs, match);
		}
	}
	STAILQ_FOREACH(dp, &dtab, d_next) {
		if (!(dp->d_done & DEVDONE)) {
			warnx("Error: device \"%s\" is unknown",
			       dp->d_name);
			       errors++;
			}
		if (dp->d_count == UNKNOWN)
			continue;
		match = 0;
		STAILQ_FOREACH(fl, &ftab, f_next) {
			if (fl->f_needs == 0)
				continue;
			if ((fl->f_flags & NEED_COUNT) == 0)
				continue;
			if (eq(dp->d_name, fl->f_needs)) {
				match++;
				break;
			}
		}
		if (match == 0) {
			warnx("Error: device \"%s\" does not take a count",
			    dp->d_name);
			errors++;
		}
	}
	if (errors)
		errx(1, "%d errors", errors);
}

static int
do_header(char *dev, int match)
{
	char *file, *name, *inw;
	struct file_list *fl, *tflp;
	struct file_list_head fl_head;
	struct device *dp;
	FILE *inf, *outf;
	int inc, oldcount;
	int count, hicount;
	int errors;

	/*
	 * After this loop, "count" will be the actual number of units,
	 * and "hicount" will be the highest unit declared.  do_header()
	 * must use this higher of these values.
	 */
	errors = 0;
	hicount = count = 0;
	STAILQ_FOREACH(dp, &dtab, d_next) {
		if (eq(dp->d_name, dev)) {
			if (dp->d_count == UNKNOWN) {
				warnx("Device \"%s\" requires a count", dev);
				return 1;
			}
			count = dp->d_count;
			break;
		}
	}
	file = toheader(dev);
	name = tomacro(dev);
	if (match)
		fprintf(stderr,
		    "FYI: static unit limits for %s are set: %s=%d\n",
		    dev, name, count);
	remember(file);
	inf = fopen(file, "r");
	oldcount = -1;
	if (inf == 0) {
		outf = fopen(file, "w");
		if (outf == 0)
			err(1, "%s", file);
		fprintf(outf, "#define %s %d\n", name, count);
		(void) fclose(outf);
		return 0;
	}
	STAILQ_INIT(&fl_head);
	for (;;) {
		char *cp;
		if ((inw = get_word(inf)) == 0 || inw == (char *)EOF)
			break;
		if ((inw = get_word(inf)) == 0 || inw == (char *)EOF)
			break;
		inw = ns(inw);
		cp = get_word(inf);
		if (cp == 0 || cp == (char *)EOF)
			break;
		inc = atoi(cp);
		if (eq(inw, name)) {
			oldcount = inc;
			inc = count;
		}
		cp = get_word(inf);
		if (cp == (char *)EOF)
			break;
		fl = (struct file_list *) malloc(sizeof *fl);
		bzero(fl, sizeof(*fl));
		fl->f_fn = inw;		/* malloced */
		fl->f_type = inc;
		STAILQ_INSERT_HEAD(&fl_head, fl, f_next);
	}
	(void) fclose(inf);
	if (count == oldcount) {
		for (fl = STAILQ_FIRST(&fl_head); fl != NULL; fl = tflp) {
			tflp = STAILQ_NEXT(fl, f_next);
			free(fl->f_fn);
			free(fl);
		}
		return 0;
	}
	if (oldcount == -1) {
		fl = (struct file_list *) malloc(sizeof *fl);
		bzero(fl, sizeof(*fl));
		fl->f_fn = ns(name);
		fl->f_type = count;
		STAILQ_INSERT_HEAD(&fl_head, fl, f_next);
	}
	outf = fopen(file, "w");
	if (outf == 0)
		err(1, "%s", file);
	for (fl = STAILQ_FIRST(&fl_head); fl != NULL; fl = tflp) {
		fprintf(outf,
		    "#define %s %u\n", fl->f_fn, count ? fl->f_type : 0);
		tflp = STAILQ_NEXT(fl, f_next);
		free(fl->f_fn);
		free(fl);
	}
	(void) fclose(outf);
	return 0;
}

/*
 * convert a dev name to a .h file name
 */
static char *
toheader(char *dev)
{
	static char hbuf[MAXPATHLEN];

	snprintf(hbuf, sizeof(hbuf), "%s.h", path(dev));
	return (hbuf);
}

/*
 * convert a dev name to a macro name
 */
static char *
tomacro(char *dev)
{
	static char mbuf[20];
	char *cp;

	cp = mbuf;
	*cp++ = 'N';
	while (*dev)
		*cp++ = islower(*dev) ? toupper(*dev++) : *dev++;
	*cp++ = 0;
	return (mbuf);
}