Coverity CID 868: Fix possible NULL deref (after INFTIM passes :-)

[bsdgames-darwin.git] / hack / hack.save.c

diff --git a/hack/hack.save.c b/hack/hack.save.c
index 26386e70659192e771858a5e4f62b856b7b24ec6..fe116bcbab6c9769c5244bde3fc0dd5bed6cf33c 100644 (file)
--- a/hack/hack.save.c
+++ b/hack/hack.save.c
@@ -1,12 +1,69 @@
-/*     $NetBSD: hack.save.c,v 1.6 1997/10/19 16:58:57 christos Exp $   */
+/*     $NetBSD: hack.save.c,v 1.8 2003/04/02 18:36:40 jsm Exp $        */
 
 /*
- * Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
+ * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
+ * Amsterdam
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * - 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.
+ *
+ * - Neither the name of the Stichting Centrum voor Wiskunde en
+ * Informatica, 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
+ * 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) 1982 Jay Fenlason <hack@gnu.org>
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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
-__RCSID("$NetBSD: hack.save.c,v 1.6 1997/10/19 16:58:57 christos Exp $");
+__RCSID("$NetBSD: hack.save.c,v 1.8 2003/04/02 18:36:40 jsm Exp $");
 #endif                         /* not lint */
 
 #include <signal.h>
@@ -30,7 +87,7 @@ dosave()
 #ifndef NOSAVEONHANGUP
 void
 hangup(n)
-       int n;
+       int n __attribute__((__unused__));
 {
        (void) dosave0(1);
        exit(1);
@@ -77,7 +134,7 @@ dosave0(hu)
                if (tmp == dlevel || !level_exists[tmp])
                        continue;
                glo(tmp);
-               if ((ofd = open(lock, 0)) < 0) {
+               if ((ofd = open(lock, O_RDONLY)) < 0) {
                        if (!hu)
                                pline("Error while saving: cannot read %s.", lock);
                        (void) close(fd);
@@ -146,7 +203,7 @@ dorecover(fd)
                savelev(nfd, tmp);
                (void) close(nfd);
        }
-       (void) lseek(fd, (off_t) 0, 0);
+       (void) lseek(fd, (off_t) 0, SEEK_SET);
        getlev(fd, 0, 0);
        (void) close(fd);
        (void) unlink(SAVEF);
@@ -225,7 +282,7 @@ restmonchn(fd)
        long            differ;
 
        mread(fd, (char *) &monbegin, sizeof(monbegin));
-       differ = (char *) (&mons[0]) - (char *) (monbegin);
+       differ = (const char *) (&mons[0]) - (const char *) (monbegin);
 
 #ifdef lint
        /* suppress "used before set" warning from lint */
@@ -243,8 +300,8 @@ restmonchn(fd)
                mread(fd, (char *) mtmp, (unsigned) xl + sizeof(struct monst));
                if (!mtmp->m_id)
                        mtmp->m_id = flags.ident++;
-               mtmp->data = (struct permonst *)
-                       ((char *) mtmp->data + differ);
+               mtmp->data = (const struct permonst *)
+                       ((const char *) mtmp->data + differ);
                if (mtmp->minvent)
                        mtmp->minvent = restobjchn(fd);
                mtmp2 = mtmp;