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Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22269, verified by myself.

/*	$NetBSD: save.c,v 1.11 2003/08/07 09:37:03 agc Exp $	*/

/*
 * Copyright (c) 1983, 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)save.c	8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: save.c,v 1.11 2003/08/07 09:37:03 agc Exp $");
#endif
#endif				/* not lint */

#include "extern.h"

void
restore(filename)
	const char *filename;
{
	int     n;
	int     tmp;
	FILE   *fp;

	if (filename == NULL)
		exit(1); /* Error determining save file name.  */
	if ((fp = fopen(filename, "r")) == 0) {
		err(1, "fopen %s", filename);
	}
	fread(&WEIGHT, sizeof WEIGHT, 1, fp);
	fread(&CUMBER, sizeof CUMBER, 1, fp);
	fread(&ourclock, sizeof ourclock, 1, fp);
	fread(&tmp, sizeof tmp, 1, fp);
	location = tmp ? dayfile : nightfile;
	for (n = 1; n <= NUMOFROOMS; n++) {
		fread(location[n].link, sizeof location[n].link, 1, fp);
		fread(location[n].objects, sizeof location[n].objects, 1, fp);
	}
	fread(inven, sizeof inven, 1, fp);
	fread(wear, sizeof wear, 1, fp);
	fread(injuries, sizeof injuries, 1, fp);
	fread(notes, sizeof notes, 1, fp);
	fread(&direction, sizeof direction, 1, fp);
	fread(&position, sizeof position, 1, fp);
	fread(&ourtime, sizeof ourtime, 1, fp);
	fread(&fuel, sizeof fuel, 1, fp);
	fread(&torps, sizeof torps, 1, fp);
	fread(&carrying, sizeof carrying, 1, fp);
	fread(&encumber, sizeof encumber, 1, fp);
	fread(&rythmn, sizeof rythmn, 1, fp);
	fread(&followfight, sizeof followfight, 1, fp);
	fread(&ate, sizeof ate, 1, fp);
	fread(&snooze, sizeof snooze, 1, fp);
	fread(&meetgirl, sizeof meetgirl, 1, fp);
	fread(&followgod, sizeof followgod, 1, fp);
	fread(&godready, sizeof godready, 1, fp);
	fread(&win, sizeof win, 1, fp);
	fread(&wintime, sizeof wintime, 1, fp);
	fread(&matchlight, sizeof matchlight, 1, fp);
	fread(&matchcount, sizeof matchcount, 1, fp);
	fread(&loved, sizeof loved, 1, fp);
	fread(&pleasure, sizeof pleasure, 1, fp);
	fread(&power, sizeof power, 1, fp);
	/* We must check the last read, to catch truncated save files */
	if (fread(&ego, sizeof ego, 1, fp) < 1)
		errx(1, "save file %s too short", filename);
	fclose(fp);
}

void
save(filename)
	const char *filename;
{
	int     n;
	int     tmp;
	FILE   *fp;

	if (filename == NULL)
		return; /* Error determining save file name.  */
	if ((fp = fopen(filename, "w")) == NULL) {
		warn("fopen %s", filename);
		return;
	}
	printf("Saved in %s.\n", filename);
	fwrite(&WEIGHT, sizeof WEIGHT, 1, fp);
	fwrite(&CUMBER, sizeof CUMBER, 1, fp);
	fwrite(&ourclock, sizeof ourclock, 1, fp);
	tmp = location == dayfile;
	fwrite(&tmp, sizeof tmp, 1, fp);
	for (n = 1; n <= NUMOFROOMS; n++) {
		fwrite(location[n].link, sizeof location[n].link, 1, fp);
		fwrite(location[n].objects, sizeof location[n].objects, 1, fp);
	}
	fwrite(inven, sizeof inven, 1, fp);
	fwrite(wear, sizeof wear, 1, fp);
	fwrite(injuries, sizeof injuries, 1, fp);
	fwrite(notes, sizeof notes, 1, fp);
	fwrite(&direction, sizeof direction, 1, fp);
	fwrite(&position, sizeof position, 1, fp);
	fwrite(&ourtime, sizeof ourtime, 1, fp);
	fwrite(&fuel, sizeof fuel, 1, fp);
	fwrite(&torps, sizeof torps, 1, fp);
	fwrite(&carrying, sizeof carrying, 1, fp);
	fwrite(&encumber, sizeof encumber, 1, fp);
	fwrite(&rythmn, sizeof rythmn, 1, fp);
	fwrite(&followfight, sizeof followfight, 1, fp);
	fwrite(&ate, sizeof ate, 1, fp);
	fwrite(&snooze, sizeof snooze, 1, fp);
	fwrite(&meetgirl, sizeof meetgirl, 1, fp);
	fwrite(&followgod, sizeof followgod, 1, fp);
	fwrite(&godready, sizeof godready, 1, fp);
	fwrite(&win, sizeof win, 1, fp);
	fwrite(&wintime, sizeof wintime, 1, fp);
	fwrite(&matchlight, sizeof matchlight, 1, fp);
	fwrite(&matchcount, sizeof matchcount, 1, fp);
	fwrite(&loved, sizeof loved, 1, fp);
	fwrite(&pleasure, sizeof pleasure, 1, fp);
	fwrite(&power, sizeof power, 1, fp);
	fwrite(&ego, sizeof ego, 1, fp);
	fflush(fp);
	if (ferror(fp))
		warn("fwrite %s", filename);
	fclose(fp);
}

/*
 * Given a save file name (possibly from fgetln, so without terminating NUL),
 * determine the name of the file to be saved to by adding the HOME
 * directory if the name does not contain a slash.  Name will be allocated
 * with malloc(3).
 */
char *
save_file_name(filename, len)
	const char *filename;
	size_t len;
{
	char   *home;
	char   *newname;
	size_t	tmpl;

	if (memchr(filename, '/', len)) {
		newname = malloc(len + 1);
		if (newname == NULL) {
			warn(NULL);
			return NULL;
		}
		memcpy(newname, filename, len);
		newname[len] = 0;
	} else {
		home = getenv("HOME");
		if (home != NULL) {
			tmpl = strlen(home);
			newname = malloc(tmpl + len + 2);
			if (newname == NULL) {
				warn(NULL);
				return NULL;
			}
			memcpy(newname, home, tmpl);
			newname[tmpl] = '/';
			memcpy(newname + tmpl + 1, filename, len);
			newname[tmpl + len + 1] = 0;
		} else {
			newname = malloc(len + 1);
			if (newname == NULL) {
				warn(NULL);
				return NULL;
			}
			memcpy(newname, filename, len);
			newname[len] = 0;
		}
	}
	return newname;
}