/* update-game-score.c --- Update a score file
- Copyright (C) 2002 Free Software Foundation, Inc.
+
+Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
+
+Author: Colin Walters <walters@debian.org>
This file is part of GNU Emacs.
-GNU Emacs is free software; you can redistribute it and/or modify
+GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GNU Emacs; see the file COPYING. If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
+
-/* This program is allows a game to securely and atomically update a
+/* This program allows a game to securely and atomically update a
score file. It should be installed setuid, owned by an appropriate
user like `games'.
defined, and in that case it will store scores in the user's home
directory (it should NOT be setuid).
- Created 2002/03/22, by Colin Walters <walters@debian.org>
+ Created 2002/03/22.
*/
#include <config.h>
#define P_(proto) ()
#endif
+#ifndef HAVE_DIFFTIME
+/* OK on POSIX (time_t is arithmetic type) modulo overflow in subtraction. */
+#define difftime(t1, t0) (double)((t1) - (t0))
+#endif
+
int
usage (err)
int err;
const char *msg;
{
fprintf (stderr, "%s\n", msg);
- exit (1);
+ exit (EXIT_FAILURE);
}
void lose_syserr P_ ((const char *msg)) NO_RETURN;
+/* Taken from sysdep.c. */
+#ifndef HAVE_STRERROR
+#ifndef WINDOWSNT
+char *
+strerror (errnum)
+ int errnum;
+{
+ extern char *sys_errlist[];
+ extern int sys_nerr;
+
+ if (errnum >= 0 && errnum < sys_nerr)
+ return sys_errlist[errnum];
+ return (char *) "Unknown error";
+}
+#endif /* not WINDOWSNT */
+#endif /* ! HAVE_STRERROR */
+
void
lose_syserr (msg)
const char *msg;
{
fprintf (stderr, "%s: %s\n", msg, strerror (errno));
- exit (1);
+ exit (EXIT_FAILURE);
}
char *
switch (c)
{
case 'h':
- usage (0);
+ usage (EXIT_SUCCESS);
break;
case 'd':
user_prefix = optarg;
max = MAX_SCORES;
break;
default:
- usage (1);
+ usage (EXIT_FAILURE);
}
if (optind+3 != argc)
- usage (1);
+ usage (EXIT_FAILURE);
running_suid = (getuid () != geteuid ());
user_id = get_user_id ();
if (user_id == NULL)
lose_syserr ("Couldn't determine user id");
-
+
if (stat (scorefile, &buf) < 0)
lose_syserr ("Failed to access scores file");
-
+
if (lock_file (scorefile, &lockstate) < 0)
lose_syserr ("Failed to lock scores file");
-
+
if (read_scores (scorefile, &scores, &scorecount) < 0)
{
unlock_file (scorefile, lockstate);
lose_syserr ("Failed to read scores file");
}
push_score (&scores, &scorecount, newscore, user_id, newdata);
+ sort_scores (scores, scorecount, reverse);
/* Limit the number of scores. If we're using reverse sorting, then
we should increment the beginning of the array, to skip over the
*smallest* scores. Otherwise, we just decrement the number of
scores, since the smallest will be at the end. */
if (scorecount > MAX_SCORES)
scorecount -= (scorecount - MAX_SCORES);
- if (reverse)
- scores += (scorecount - MAX_SCORES);
- sort_scores (scores, scorecount, reverse);
+ if (reverse)
+ scores += (scorecount - MAX_SCORES);
if (write_scores (scorefile, scores, scorecount) < 0)
{
unlock_file (scorefile, lockstate);
lose_syserr ("Failed to write scores file");
}
unlock_file (scorefile, lockstate);
- exit (0);
+ exit (EXIT_SUCCESS);
}
int
char *username = malloc (unamelen);
if (!username)
return -1;
-
+
while ((c = getc (f)) != EOF
&& !isspace (c))
{
username[unameread] = c;
unameread++;
}
- if (c == EOF)
+ if (c == EOF)
return -1;
username[unameread] = '\0';
score->username = username;
int readval, scorecount, cursize;
struct score_entry *ret;
FILE *f = fopen (filename, "r");
- if (!f)
+ if (!f)
return -1;
scorecount = 0;
cursize = 16;
ret = (struct score_entry *) malloc (sizeof (struct score_entry) * cursize);
- if (!ret)
+ if (!ret)
return -1;
while ((readval = read_score (f, &ret[scorecount])) == 0)
{
scorecount++;
if (scorecount >= cursize)
{
- ret = (struct score_entry *) realloc (ret, cursize *= 2);
+ cursize *= 2;
+ ret = (struct score_entry *)
+ realloc (ret, (sizeof (struct score_entry) * cursize));
if (!ret)
return -1;
}
}
int
-push_score (scores, count, newscore, username, newdata)
+push_score (scores, count, newscore, username, newdata)
struct score_entry **scores;
int *count; int newscore;
char *username;
*scores = newscores;
return 0;
}
-
+
void
sort_scores (scores, count, reverse)
struct score_entry *scores;
int count;
- int reverse;
+ int reverse;
{
qsort (scores, count, sizeof (struct score_entry),
reverse ? score_compare_reverse : score_compare);
write_scores (filename, scores, count)
const char *filename;
const struct score_entry * scores;
- int count;
+ int count;
{
- FILE *f;
+ FILE *f;
int i;
char *tempfile = malloc (strlen (filename) + strlen (".tempXXXXXX") + 1);
if (!tempfile)
return -1;
return 0;
}
-
+
int
lock_file (filename, state)
const char *filename;
close (fd);
return 0;
}
-
+
int
unlock_file (filename, state)
const char *filename;
errno = saved_errno;
return ret;
}
+
+/* arch-tag: 2bf5c52e-4beb-463a-954e-c58b9c64736b
+ (do not change this comment) */
+
+/* update-game-score.c ends here */
HCoop / bpt / emacs.git / blobdiff