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When system calls indicate an error they return -1, not some arbitrary
value < 0.  errno is only updated in this case.  Change all (most?)
callers of syscalls to follow this better, and let's see if this strictness
helps us in the future.

/*	$OpenBSD: log.c,v 1.25 2019/06/28 13:32:52 deraadt Exp $	*/
/*	$NetBSD: log.c,v 1.3 1995/03/21 15:04:21 cgd Exp $	*/

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ed James.
 *
 * 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.
 */

/*
 * Copyright (c) 1987 by Ed James, UC Berkeley.  All rights reserved.
 *
 * Copy permission is hereby granted provided that this notice is
 * retained on all partial or complete copies.
 *
 * For more info on this and all of my stuff, mail edjames@berkeley.edu.
 */

#include <sys/stat.h>
#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "extern.h"
#include "pathnames.h"

static FILE *score_fp;

int
compar(const void *va, const void *vb)
{
	const SCORE *a, *b;

	a = (const SCORE *)va;
	b = (const SCORE *)vb;
	if (b->planes == a->planes)
		return (b->time - a->time);
	else
		return (b->planes - a->planes);
}

#define SECAMIN		60
#define MINAHOUR	60
#define HOURADAY	24
#define SECAHOUR	(SECAMIN * MINAHOUR)
#define SECADAY		(SECAHOUR * HOURADAY)
#define DAY(t)		((t) / SECADAY)
#define HOUR(t)		(((t) % SECADAY) / SECAHOUR)
#define MINUTES(t)		(((t) % SECAHOUR) / SECAMIN)
#define SEC(t)		((t) % SECAMIN)

const char	*
timestr(int t)
{
	static char	s[80];

	if (DAY(t) > 0)
		(void)snprintf(s, sizeof s, "%dd+%02dhrs", DAY(t), HOUR(t));
	else if (HOUR(t) > 0)
		(void)snprintf(s, sizeof s, "%d:%02d:%02d",
		    HOUR(t), MINUTES(t), SEC(t));
	else if (MINUTES(t) > 0)
		(void)snprintf(s, sizeof s, "%d:%02d", MINUTES(t), SEC(t));
	else if (SEC(t) > 0)
		(void)snprintf(s, sizeof s, ":%02d", SEC(t));
	else
		*s = '\0';

	return (s);
}

int
open_score_file(void)
{
	mode_t old_mode;
	char *home;
	char scorefile[PATH_MAX];
	int ret;
	int score_fd;

	home = getenv("HOME");
	if (home == NULL || *home == '\0')
		err(1, "getenv");
	ret = snprintf(scorefile, sizeof(scorefile), "%s/%s", home,
	    ".atc.scores");
	if (ret < 0 || ret >= PATH_MAX)
		errc(1, ENAMETOOLONG, "%s/%s", home, ".atc.scores");

	old_mode = umask(0);
	score_fd = open(scorefile, O_CREAT|O_RDWR, 0644);
	if (score_fd == -1)
		err(1, "open");
	/*
	 * This is done to take advantage of stdio, while still
	 * allowing a O_CREAT during the open(2) of the log file.
	 */
	score_fp = fdopen(score_fd, "r+");
	if (score_fp == NULL)
		err(1, "fdopen");
	umask(old_mode);
	return (0);
}

int
log_score(int list_em)
{
	int		i, num_scores = 0, good, changed = 0, found = 0;
	const char	*name;
	char		*cp;
	char		scanstr[50];
	SCORE		score[NUM_SCORES], thisscore;

	if (score_fp == NULL)
		return (-1);
	if (flock(fileno(score_fp), LOCK_EX) == -1)
		err(1, "flock");
	snprintf(scanstr, 50, "%%%zus %%%zus %%d %%d %%d", sizeof(score[0].name)-1,
	    sizeof(score[0].game)-1);
	for (;;) {
		good = fscanf(score_fp, scanstr,
			score[num_scores].name,
			score[num_scores].game,
			&score[num_scores].planes,
			&score[num_scores].time,
			&score[num_scores].real_time);
		if (good != 5 || ++num_scores >= NUM_SCORES)
			break;
	}
	if (!test_mode && !list_em) {
		name = getenv("LOGNAME");
		if (name == NULL || *name == '\0')
			name = getenv("USER");
		if (name == NULL || *name == '\0')
			name = getlogin();
		if (name == NULL || *name == '\0')
			name = "  ???";
		strlcpy(thisscore.name, name, sizeof(thisscore.name));

		cp = strrchr(file, '/');
		if (cp == NULL) {
			warnx("log: where's the '/' in %s?", file);
			return (-1);
		}
		cp++;
		strlcpy(thisscore.game, cp, sizeof(thisscore.game));

		thisscore.time = clck;
		thisscore.planes = safe_planes;
		thisscore.real_time = time(0) - start_time;

		for (i = 0; i < num_scores; i++) {
			if (strcmp(thisscore.name, score[i].name) == 0 &&
			    strcmp(thisscore.game, score[i].game) == 0) {
				if (thisscore.time > score[i].time) {
					score[i].time = thisscore.time;
					score[i].planes = thisscore.planes;
					score[i].real_time =
						thisscore.real_time;
					changed++;
				}
				found++;
				break;
			}
		}
		if (!found) {
			for (i = 0; i < num_scores; i++) {
				if (thisscore.time > score[i].time) {
					if (num_scores < NUM_SCORES)
						num_scores++;
					memcpy(&score[num_scores - 1],
						&score[i],
						sizeof (score[i]));
					memcpy(&score[i], &thisscore,
						sizeof (score[i]));
					changed++;
					break;
				}
			}
		}
		if (!found && !changed && num_scores < NUM_SCORES) {
			memcpy(&score[num_scores], &thisscore,
				sizeof (score[num_scores]));
			num_scores++;
			changed++;
		}

		if (seeded) {
			puts("The high score list does not include '-r' seeded games.");
		} else if (changed) {
			if (found)
				puts("You beat your previous score!");
			else
				puts("You made the top players list!");
			qsort(score, num_scores, sizeof (*score), compar);
			if (fseek(score_fp, 0L, SEEK_SET) == -1)
				err(1, "fseek");
			for (i = 0; i < num_scores; i++)
				fprintf(score_fp, "%s %s %d %d %d\n",
					score[i].name,
					score[i].game, score[i].planes,
					score[i].time, score[i].real_time);
		} else {
			if (found)
				puts("You didn't beat your previous score.");
			else
				puts("You didn't make the top players list.");
		}
		putchar('\n');
	}
	flock(fileno(score_fp), LOCK_UN);
	fflush(score_fp);
	fsync(fileno(score_fp));
	if (fseek(score_fp, 0L, SEEK_SET) == -1)
		err(1, "fseek");
	printf("%2s:  %-31s  %-18s  %4s  %9s  %4s\n", "#", "name",
		"game", "time", "real time", "safe");
	puts("-------------------------------------------------------------------------------");
	for (i = 0; i < num_scores; i++) {
		printf("%2d:  %-31s  %-18s  %4d  %9s  %4d\n", i + 1,
			score[i].name, score[i].game,
			score[i].time, timestr(score[i].real_time),
			score[i].planes);
	}
	putchar('\n');
	return (0);
}

void
log_score_quit(int dummy)
{
	(void)log_score(0);
	exit(0);
}