don't try to fseek to before the beginning of the file;

showed up after the fix to sys_lseek concerning negative offsets.
avoids '/var/account/acct: Invalid argument' messages.

diff --git a/usr.bin/lastcomm/lastcomm.c b/usr.bin/lastcomm/lastcomm.c
index f47688f..66478b3 100644 (file)
--- a/usr.bin/lastcomm/lastcomm.c
+++ b/usr.bin/lastcomm/lastcomm.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: lastcomm.c,v 1.4 1997/01/15 23:42:41 millert Exp $    */
+/*     $OpenBSD: lastcomm.c,v 1.5 1997/03/03 03:25:10 flipk Exp $      */
 /*     $NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson Exp $     */
 
 /*
@@ -44,7 +44,7 @@ static char copyright[] =
 #if 0
 static char sccsid[] = "@(#)lastcomm.c 8.2 (Berkeley) 4/29/95";
 #endif
-static char rcsid[] = "$OpenBSD: lastcomm.c,v 1.4 1997/01/15 23:42:41 millert Exp $";
+static char rcsid[] = "$OpenBSD: lastcomm.c,v 1.5 1997/03/03 03:25:10 flipk Exp $";
 #endif /* not lint */
 
 #include <sys/param.h>
@@ -128,8 +128,6 @@ main(argc, argv)
                if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
                        err(1, "%s", acctfile);
 
-               if (size == 0)
-                       break;
                size -= sizeof(struct acct);
 
                if (ab.ac_comm[0] == '\0') {
@@ -154,6 +152,9 @@ main(argc, argv)
                    delta / SECSPERHOUR,
                    fmod(delta, SECSPERHOUR) / SECSPERMIN,
                    fmod(delta, SECSPERMIN));
+
+               if (size == 0)
+                       break;
        }
        exit(0);
 }