mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-27 08:49:16 +08:00
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*! \file Utility functions for tests.
|
|
|
|
\internal
|
|
Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
|
|
2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
|
|
2015, 2016, 2017, 2018
|
|
University Corporation for Atmospheric Research/Unidata.
|
|
|
|
See \ref copyright file for more info.
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <nc_tests.h>
|
|
#include <time.h>
|
|
#include <sys/time.h>
|
|
|
|
/** Subtract the `struct timeval' values X and Y, storing the result in
|
|
RESULT. Return 1 if the difference is negative, otherwise 0. This
|
|
function from the GNU documentation. */
|
|
int
|
|
nc4_timeval_subtract (result, x, y)
|
|
struct timeval *result, *x, *y;
|
|
{
|
|
/* Perform the carry for the later subtraction by updating Y. */
|
|
if (x->tv_usec < y->tv_usec) {
|
|
int nsec = (y->tv_usec - x->tv_usec) / MILLION + 1;
|
|
y->tv_usec -= MILLION * nsec;
|
|
y->tv_sec += nsec;
|
|
}
|
|
if (x->tv_usec - y->tv_usec > MILLION) {
|
|
int nsec = (x->tv_usec - y->tv_usec) / MILLION;
|
|
y->tv_usec += MILLION * nsec;
|
|
y->tv_sec -= nsec;
|
|
}
|
|
|
|
/* Compute the time remaining to wait.
|
|
`tv_usec' is certainly positive. */
|
|
result->tv_sec = x->tv_sec - y->tv_sec;
|
|
result->tv_usec = x->tv_usec - y->tv_usec;
|
|
|
|
/* Return 1 if result is negative. */
|
|
return x->tv_sec < y->tv_sec;
|
|
}
|