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36 lines
1020 B
C
36 lines
1020 B
C
/** \internal
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\file
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Utility functions for tests. */
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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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nc4_timeval_subtract (result, x, y)
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struct timeval *result, *x, *y;
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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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