NetBSD-5.0.2/games/tetris/scores.c
/* $NetBSD: scores.c,v 1.14 2006/06/01 16:12:27 drochner Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek and Darren F. Provine.
*
* 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.
*
* @(#)scores.c 8.1 (Berkeley) 5/31/93
*/
/*
* Score code for Tetris, by Darren Provine (kilroy@gboro.glassboro.edu)
* modified 22 January 1992, to limit the number of entries any one
* person has.
*
* Major whacks since then.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <termcap.h>
#include <unistd.h>
#include "pathnames.h"
#include "screen.h"
#include "scores.h"
#include "tetris.h"
/*
* Within this code, we can hang onto one extra "high score", leaving
* room for our current score (whether or not it is high).
*
* We also sometimes keep tabs on the "highest" score on each level.
* As long as the scores are kept sorted, this is simply the first one at
* that level.
*/
#define NUMSPOTS (MAXHISCORES + 1)
#define NLEVELS (MAXLEVEL + 1)
static time_t now;
static int nscores;
static int gotscores;
static struct highscore scores[NUMSPOTS];
static int checkscores(struct highscore *, int);
static int cmpscores(const void *, const void *);
static void getscores(FILE **);
static void printem(int, int, struct highscore *, int, const char *);
static char *thisuser(void);
/*
* Read the score file. Can be called from savescore (before showscores)
* or showscores (if savescore will not be called). If the given pointer
* is not NULL, sets *fpp to an open file pointer that corresponds to a
* read/write score file that is locked with LOCK_EX. Otherwise, the
* file is locked with LOCK_SH for the read and closed before return.
*
* Note, we assume closing the stdio file releases the lock.
*/
static void
getscores(fpp)
FILE **fpp;
{
int sd, mint, lck;
mode_t mask;
const char *mstr, *human;
FILE *sf;
if (fpp != NULL) {
mint = O_RDWR | O_CREAT;
mstr = "r+";
human = "read/write";
lck = LOCK_EX;
} else {
mint = O_RDONLY;
mstr = "r";
human = "reading";
lck = LOCK_SH;
}
setegid(egid);
mask = umask(S_IWOTH);
sd = open(_PATH_SCOREFILE, mint, 0666);
(void)umask(mask);
if (sd < 0) {
if (fpp == NULL) {
nscores = 0;
setegid(gid);
return;
}
err(1, "cannot open %s for %s", _PATH_SCOREFILE, human);
}
if ((sf = fdopen(sd, mstr)) == NULL) {
err(1, "cannot fdopen %s for %s", _PATH_SCOREFILE, human);
}
setegid(gid);
/*
* Grab a lock.
*/
if (flock(sd, lck))
warn("warning: score file %s cannot be locked",
_PATH_SCOREFILE);
nscores = fread(scores, sizeof(scores[0]), MAXHISCORES, sf);
if (ferror(sf)) {
err(1, "error reading %s", _PATH_SCOREFILE);
}
if (fpp)
*fpp = sf;
else
(void)fclose(sf);
}
void
savescore(level)
int level;
{
struct highscore *sp;
int i;
int change;
FILE *sf;
const char *me;
getscores(&sf);
gotscores = 1;
(void)time(&now);
/*
* Allow at most one score per person per level -- see if we
* can replace an existing score, or (easiest) do nothing.
* Otherwise add new score at end (there is always room).
*/
change = 0;
me = thisuser();
for (i = 0, sp = &scores[0]; i < nscores; i++, sp++) {
if (sp->hs_level != level || strcmp(sp->hs_name, me) != 0)
continue;
if (score > sp->hs_score) {
(void)printf("%s bettered %s %d score of %d!\n",
"\nYou", "your old level", level,
sp->hs_score * sp->hs_level);
sp->hs_score = score; /* new score */
sp->hs_time = now; /* and time */
change = 1;
} else if (score == sp->hs_score) {
(void)printf("%s tied %s %d high score.\n",
"\nYou", "your old level", level);
sp->hs_time = now; /* renew it */
change = 1; /* gotta rewrite, sigh */
} /* else new score < old score: do nothing */
break;
}
if (i >= nscores) {
strcpy(sp->hs_name, me);
sp->hs_level = level;
sp->hs_score = score;
sp->hs_time = now;
nscores++;
change = 1;
}
if (change) {
/*
* Sort & clean the scores, then rewrite.
*/
nscores = checkscores(scores, nscores);
rewind(sf);
if (fwrite(scores, sizeof(*sp), nscores, sf) != (size_t)nscores ||
fflush(sf) == EOF)
warnx("error writing %s: %s -- %s",
_PATH_SCOREFILE, strerror(errno),
"high scores may be damaged");
}
(void)fclose(sf); /* releases lock */
}
/*
* Get login name, or if that fails, get something suitable.
* The result is always trimmed to fit in a score.
*/
static char *
thisuser()
{
const char *p;
struct passwd *pw;
size_t l;
static char u[sizeof(scores[0].hs_name)];
if (u[0])
return (u);
p = getlogin();
if (p == NULL || *p == '\0') {
pw = getpwuid(getuid());
if (pw != NULL)
p = pw->pw_name;
else
p = " ???";
}
l = strlen(p);
if (l >= sizeof(u))
l = sizeof(u) - 1;
memcpy(u, p, l);
u[l] = '\0';
return (u);
}
/*
* Score comparison function for qsort.
*
* If two scores are equal, the person who had the score first is
* listed first in the highscore file.
*/
static int
cmpscores(x, y)
const void *x, *y;
{
const struct highscore *a, *b;
long l;
a = x;
b = y;
l = (long)b->hs_level * b->hs_score - (long)a->hs_level * a->hs_score;
if (l < 0)
return (-1);
if (l > 0)
return (1);
if (a->hs_time < b->hs_time)
return (-1);
if (a->hs_time > b->hs_time)
return (1);
return (0);
}
/*
* If we've added a score to the file, we need to check the file and ensure
* that this player has only a few entries. The number of entries is
* controlled by MAXSCORES, and is to ensure that the highscore file is not
* monopolised by just a few people. People who no longer have accounts are
* only allowed the highest score. Scores older than EXPIRATION seconds are
* removed, unless they are someone's personal best.
* Caveat: the highest score on each level is always kept.
*/
static int
checkscores(hs, num)
struct highscore *hs;
int num;
{
struct highscore *sp;
int i, j, k, numnames;
int levelfound[NLEVELS];
struct peruser {
char *name;
int times;
} count[NUMSPOTS];
struct peruser *pu;
/*
* Sort so that highest totals come first.
*
* levelfound[i] becomes set when the first high score for that
* level is encountered. By definition this is the highest score.
*/
qsort((void *)hs, nscores, sizeof(*hs), cmpscores);
for (i = MINLEVEL; i < NLEVELS; i++)
levelfound[i] = 0;
numnames = 0;
for (i = 0, sp = hs; i < num;) {
/*
* This is O(n^2), but do you think we care?
*/
for (j = 0, pu = count; j < numnames; j++, pu++)
if (strcmp(sp->hs_name, pu->name) == 0)
break;
if (j == numnames) {
/*
* Add new user, set per-user count to 1.
*/
pu->name = sp->hs_name;
pu->times = 1;
numnames++;
} else {
/*
* Two ways to keep this score:
* - Not too many (per user), still has acct, &
* score not dated; or
* - High score on this level.
*/
if ((pu->times < MAXSCORES &&
getpwnam(sp->hs_name) != NULL &&
sp->hs_time + EXPIRATION >= now) ||
levelfound[sp->hs_level] == 0)
pu->times++;
else {
/*
* Delete this score, do not count it,
* do not pass go, do not collect $200.
*/
num--;
for (k = i; k < num; k++)
hs[k] = hs[k + 1];
continue;
}
}
if (sp->hs_level < NLEVELS && sp->hs_level >= 0)
levelfound[sp->hs_level] = 1;
i++, sp++;
}
return (num > MAXHISCORES ? MAXHISCORES : num);
}
/*
* Show current scores. This must be called after savescore, if
* savescore is called at all, for two reasons:
* - Showscores munches the time field.
* - Even if that were not the case, a new score must be recorded
* before it can be shown anyway.
*/
void
showscores(level)
int level;
{
struct highscore *sp;
int i, n, c;
const char *me;
int levelfound[NLEVELS];
if (!gotscores)
getscores((FILE **)NULL);
(void)printf("\n\t\t\t Tetris High Scores\n");
/*
* If level == 0, the person has not played a game but just asked for
* the high scores; we do not need to check for printing in highlight
* mode. If SOstr is null, we can't do highlighting anyway.
*/
me = level && SOstr ? thisuser() : NULL;
/*
* Set times to 0 except for high score on each level.
*/
for (i = MINLEVEL; i < NLEVELS; i++)
levelfound[i] = 0;
for (i = 0, sp = scores; i < nscores; i++, sp++) {
if (sp->hs_level < NLEVELS && sp->hs_level >= 0) {
if (levelfound[sp->hs_level])
sp->hs_time = 0;
else {
sp->hs_time = 1;
levelfound[sp->hs_level] = 1;
}
}
}
/*
* Page each screenful of scores.
*/
for (i = 0, sp = scores; i < nscores; sp += n) {
n = 40;
if (i + n > nscores)
n = nscores - i;
printem(level, i + 1, sp, n, me);
if ((i += n) < nscores) {
(void)printf("\nHit RETURN to continue.");
(void)fflush(stdout);
while ((c = getchar()) != '\n')
if (c == EOF)
break;
(void)printf("\n");
}
}
}
static void
printem(level, offset, hs, n, me)
int level, offset;
struct highscore *hs;
int n;
const char *me;
{
struct highscore *sp;
int nrows, row, col, item, i, highlight;
char buf[100];
#define TITLE "Rank Score Name (points/level)"
/*
* This makes a nice two-column sort with headers, but it's a bit
* convoluted...
*/
printf("%s %s\n", TITLE, n > 1 ? TITLE : "");
highlight = 0;
nrows = (n + 1) / 2;
for (row = 0; row < nrows; row++) {
for (col = 0; col < 2; col++) {
item = col * nrows + row;
if (item >= n) {
/*
* Can only occur on trailing columns.
*/
(void)putchar('\n');
continue;
}
sp = &hs[item];
(void)snprintf(buf, sizeof(buf),
"%3d%c %6d %-11s (%6d on %d)",
item + offset, sp->hs_time ? '*' : ' ',
sp->hs_score * sp->hs_level,
sp->hs_name, sp->hs_score, sp->hs_level);
/*
* Highlight if appropriate. This works because
* we only get one score per level.
*/
if (me != NULL &&
sp->hs_level == level &&
sp->hs_score == score &&
strcmp(sp->hs_name, me) == 0) {
putpad(SOstr);
highlight = 1;
}
(void)printf("%s", buf);
if (highlight) {
putpad(SEstr);
highlight = 0;
}
/* fill in spaces so column 1 lines up */
if (col == 0)
for (i = 40 - strlen(buf); --i >= 0;)
(void)putchar(' ');
else /* col == 1 */
(void)putchar('\n');
}
}
}