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authorThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:13 -0800
committerThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:13 -0800
commit1767f908af327fa388b1c66883760ad851267013 (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /libc/tzcode/difftime.c
parenta799b53f10e5a6fd51fef4436cfb7ec99836a516 (diff)
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auto import from //depot/cupcake/@135843
Diffstat (limited to 'libc/tzcode/difftime.c')
-rw-r--r--libc/tzcode/difftime.c65
1 files changed, 0 insertions, 65 deletions
diff --git a/libc/tzcode/difftime.c b/libc/tzcode/difftime.c
deleted file mode 100644
index da77977..0000000
--- a/libc/tzcode/difftime.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
-** This file is in the public domain, so clarified as of
-** 1996-06-05 by Arthur David Olson.
-*/
-
-#ifndef lint
-#ifndef NOID
-static char elsieid[] = "@(#)difftime.c 8.1";
-#endif /* !defined NOID */
-#endif /* !defined lint */
-
-/*LINTLIBRARY*/
-
-#include "private.h" /* for time_t, TYPE_INTEGRAL, and TYPE_SIGNED */
-
-double
-difftime(time1, time0)
-const time_t time1;
-const time_t time0;
-{
- /*
- ** If (sizeof (double) > sizeof (time_t)) simply convert and subtract
- ** (assuming that the larger type has more precision).
- ** This is the common real-world case circa 2004.
- */
- if (sizeof (double) > sizeof (time_t))
- return (double) time1 - (double) time0;
- if (!TYPE_INTEGRAL(time_t)) {
- /*
- ** time_t is floating.
- */
- return time1 - time0;
- }
- if (!TYPE_SIGNED(time_t)) {
- /*
- ** time_t is integral and unsigned.
- ** The difference of two unsigned values can't overflow
- ** if the minuend is greater than or equal to the subtrahend.
- */
- if (time1 >= time0)
- return time1 - time0;
- else return -((double) (time0 - time1));
- }
- /*
- ** time_t is integral and signed.
- ** Handle cases where both time1 and time0 have the same sign
- ** (meaning that their difference cannot overflow).
- */
- if ((time1 < 0) == (time0 < 0))
- return time1 - time0;
- /*
- ** time1 and time0 have opposite signs.
- ** Punt if unsigned long is too narrow.
- */
- if (sizeof (unsigned long) < sizeof (time_t))
- return (double) time1 - (double) time0;
- /*
- ** Stay calm...decent optimizers will eliminate the complexity below.
- */
- if (time1 >= 0 /* && time0 < 0 */)
- return (unsigned long) time1 +
- (unsigned long) (-(time0 + 1)) + 1;
- return -(double) ((unsigned long) time0 +
- (unsigned long) (-(time1 + 1)) + 1);
-}