[src/trunk]: src/lib/libc/time do the overflow check in a way that gcc-4.5 li...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ff6d194a231c
branches:  trunk
changeset: 768394:ff6d194a231c
user:      christos <christos%NetBSD.org@localhost>
date:      Tue Aug 16 07:51:46 2011 +0000

description:
do the overflow check in a way that gcc-4.5 likes.

diffstat:

 lib/libc/time/zdump.c |  17 ++++++++++++-----
 1 files changed, 12 insertions(+), 5 deletions(-)

diffs (45 lines):

diff -r bfc9d613c41b -r ff6d194a231c lib/libc/time/zdump.c
--- a/lib/libc/time/zdump.c     Tue Aug 16 07:05:15 2011 +0000
+++ b/lib/libc/time/zdump.c     Tue Aug 16 07:51:46 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: zdump.c,v 1.19 2011/01/15 12:31:57 martin Exp $        */
+/*     $NetBSD: zdump.c,v 1.20 2011/08/16 07:51:46 christos Exp $      */
 /*
 ** This file is in the public domain, so clarified as of
 ** 2009-05-17 by Arthur David Olson.
@@ -7,7 +7,7 @@
 #include <sys/cdefs.h>
 #ifndef lint
 #ifndef NOID
-__RCSID("$NetBSD: zdump.c,v 1.19 2011/01/15 12:31:57 martin Exp $");
+__RCSID("$NetBSD: zdump.c,v 1.20 2011/08/16 07:51:46 christos Exp $");
 #endif /* !defined NOID */
 #endif /* !defined lint */
 
@@ -410,6 +410,15 @@
        return EXIT_FAILURE;
 }
 
+static time_t
+ovfl_check(time_t t)
+{
+       if (t < 0 && t - 1 >= 0)
+               return t;
+       else
+               return t - 1;
+}
+
 static void
 setabsolutes(void)
 {
@@ -443,9 +452,7 @@
 
                absolute_max_time = t;
                t = -t;
-               absolute_min_time = t - 1;
-               if (t < absolute_min_time)
-                       absolute_min_time = t;
+               absolute_min_time = ovfl_check(t);
        } else {
                /*
                ** time_t is unsigned.