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-rw-r--r--time/difftime.c44
1 files changed, 22 insertions, 22 deletions
diff --git a/time/difftime.c b/time/difftime.c
index 49c5bfbc5c..170471768f 100644
--- a/time/difftime.c
+++ b/time/difftime.c
@@ -1,28 +1,30 @@
-/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1991, 1994, 1996 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-#include <ansidecl.h>
#include <time.h>
+#include <values.h>
/* Return the difference between TIME1 and TIME0. */
double
-DEFUN(difftime, (time1, time0), time_t time1 AND time_t time0)
+difftime (time1, time0)
+ time_t time1;
+ time_t time0;
{
/* Algorithm courtesy Paul Eggert (eggert@twinsun.com). */
@@ -30,8 +32,8 @@ DEFUN(difftime, (time1, time0), time_t time1 AND time_t time0)
if (sizeof (time_t) < sizeof (double))
return (double) time1 - (double) time0;
- if (sizeof (time_t) < sizeof (LONG_DOUBLE))
- return (LONG_DOUBLE) time1 - (LONG_DOUBLE) time0;
+ if (sizeof (time_t) < sizeof (long double))
+ return (long double) time1 - (long double) time0;
if (time1 < time0)
return - difftime (time0, time1);
@@ -43,9 +45,7 @@ DEFUN(difftime, (time1, time0), time_t time1 AND time_t time0)
return delta;
/* Repair delta overflow. */
- hibit = 1;
- while ((hibit <<= 1) > 0)
- continue;
+ hibit = (~ (time_t) 0) << (_TYPEBITS (time_t) - 1);
/* The following expression rounds twice, which means the result may not
be the closest to the true answer. For example, suppose time_t is
@@ -62,5 +62,5 @@ DEFUN(difftime, (time1, time0), time_t time1 AND time_t time0)
round twice when converting large unsigned types to small floating
types, so if time_t is unsigned the "return delta" above has the same
double-rounding problem. */
- return delta - 2 * (LONG_DOUBLE) hibit;
+ return delta - 2 * (long double) hibit;
}