2018-12-07 06:27:32 +08:00
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/*! \file Utility functions for tests.
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\internal
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Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
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2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
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2015, 2016, 2017, 2018
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University Corporation for Atmospheric Research/Unidata.
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See \ref copyright file for more info.
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*/
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2011-07-21 05:32:41 +08:00
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#include <nc_tests.h>
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#include <time.h>
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#include <sys/time.h>
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/** Subtract the `struct timeval' values X and Y, storing the result in
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RESULT. Return 1 if the difference is negative, otherwise 0. This
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function from the GNU documentation. */
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int
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2023-11-07 10:06:15 +08:00
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nc4_timeval_subtract (struct timeval *result, struct timeval *x, struct timeval *y)
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2011-07-21 05:32:41 +08:00
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{
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/* Perform the carry for the later subtraction by updating Y. */
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if (x->tv_usec < y->tv_usec) {
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int nsec = (y->tv_usec - x->tv_usec) / MILLION + 1;
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y->tv_usec -= MILLION * nsec;
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y->tv_sec += nsec;
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}
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if (x->tv_usec - y->tv_usec > MILLION) {
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int nsec = (x->tv_usec - y->tv_usec) / MILLION;
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y->tv_usec += MILLION * nsec;
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y->tv_sec -= nsec;
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}
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/* Compute the time remaining to wait.
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`tv_usec' is certainly positive. */
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result->tv_sec = x->tv_sec - y->tv_sec;
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result->tv_usec = x->tv_usec - y->tv_usec;
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/* Return 1 if result is negative. */
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return x->tv_sec < y->tv_sec;
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}
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