diff options
author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:13 -0800 |
---|---|---|
committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:13 -0800 |
commit | 1767f908af327fa388b1c66883760ad851267013 (patch) | |
tree | 4b825dc642cb6eb9a060e54bf8d69288fbee4904 /libc/tzcode/difftime.c | |
parent | a799b53f10e5a6fd51fef4436cfb7ec99836a516 (diff) | |
download | bionic-1767f908af327fa388b1c66883760ad851267013.zip bionic-1767f908af327fa388b1c66883760ad851267013.tar.gz bionic-1767f908af327fa388b1c66883760ad851267013.tar.bz2 |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'libc/tzcode/difftime.c')
-rw-r--r-- | libc/tzcode/difftime.c | 65 |
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); -} |