diff options
Diffstat (limited to 'time/difftime.c')
| -rw-r--r-- | time/difftime.c | 44 |
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; } |