Commit the new time stuff, even though I haven't made it threadsafe yet.

At least people can play with it.  Also, fix a buglet in setenv.c.

1 files changed, 0 insertions, 64 deletions

diff --git a/libc/misc/time/difftime.c b/libc/misc/time/difftime.c
deleted file mode 100644
index 88a9244ba..000000000
--- a/libc/misc/time/difftime.c
+++ /dev/null
@@ -1,64 +0,0 @@
-/* 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 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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
-
-#include <time.h>
-#include <limits.h>
-#include <sys/types.h>
-
-
-/* Return the difference between TIME1 and TIME0.  */
-double difftime (time_t time1, time_t time0)
-{
-  /* Algorithm courtesy Paul Eggert (eggert@twinsun.com).  */
-
-  time_t delta, hibit;
-
-  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 (time1 < time0)
-    return - difftime (time0, time1);
-
-  /* As much as possible, avoid loss of precision by computing the
-    difference before converting to double.  */
-  delta = time1 - time0;
-  if (delta >= 0)
-    return delta;
-
-  /* Repair delta overflow.  */
-  hibit = (~ (time_t) 0) << ((sizeof (time_t) * CHAR_BIT) - 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
-     64-bit signed int, long_double is IEEE 754 double with default
-     rounding, time1 = 9223372036854775807 and time0 = -1536.  Then the
-     true difference is 9223372036854777343, which rounds to
-     9223372036854777856 with a total error of 513.  But delta overflows to
-     -9223372036854774273, which rounds to -9223372036854774784, and
-     correcting this by subtracting 2 * (long_double) hibit (i.e. by adding
-     2**64 = 18446744073709551616) yields 9223372036854776832, which rounds
-     to 9223372036854775808 with a total error of 1535 instead.  This
-     problem occurs only with very large differences.  It's too painful to
-     fix this portably.  We are not alone in this problem; many C compilers
-     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;
-}