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/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
#ifndef TEST
int
libsimple_difftimespec(struct timespec *diff, const struct timespec *minuend, const struct timespec *subtrahend)
{
time_t s;
if (LIBSIMPLE_SSUB_OVERFLOW(minuend->tv_sec, subtrahend->tv_sec, &s, TIME_MIN, TIME_MAX)) {
if (subtrahend->tv_sec < 0)
goto too_large;
else
goto too_small;
}
diff->tv_nsec = minuend->tv_nsec - subtrahend->tv_nsec;
if (diff->tv_nsec < 0) {
if (LIBSIMPLE_SDECR_OVERFLOW(&s, TIME_MIN))
goto too_small;
diff->tv_nsec += 1000000000L;
}
diff->tv_sec = s;
return 0;
too_large:
diff->tv_sec = TIME_MAX;
diff->tv_nsec = 999999999L;
errno = ERANGE;
return -1;
too_small:
diff->tv_sec = TIME_MIN;
diff->tv_nsec = 0;
errno = ERANGE;
return -1;
}
#else
#include "test.h"
int
main(void)
{
struct timespec r, a, b;
a.tv_sec = 0, a.tv_nsec = 0L;
b.tv_sec = 0, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 0L;
b.tv_sec = 0, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 10);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 100L;
b.tv_sec = 0, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 10);
assert(r.tv_nsec == 100L);
a.tv_sec = 10, a.tv_nsec = 100L;
b.tv_sec = 1, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 9);
assert(r.tv_nsec == 100L);
a.tv_sec = 10, a.tv_nsec = 100L;
b.tv_sec = 0, b.tv_nsec = 1L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 10);
assert(r.tv_nsec == 99L);
a.tv_sec = -10, a.tv_nsec = 100L;
b.tv_sec = 0, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == -10);
assert(r.tv_nsec == 100L);
a.tv_sec = 10, a.tv_nsec = 1L;
b.tv_sec = 1, b.tv_nsec = 100L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 8);
assert(r.tv_nsec == 1000000001L - 100L);
a.tv_sec = 10, a.tv_nsec = 0L;
b.tv_sec = 20, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == -10);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 10L;
b.tv_sec = 20, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == -10);
assert(r.tv_nsec == 10L);
a.tv_sec = 10, a.tv_nsec = 10L;
b.tv_sec = 20, b.tv_nsec = 20L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == -10 - 1);
assert(r.tv_nsec == 1000000010L - 20L);
a.tv_sec = 10, a.tv_nsec = 10L;
b.tv_sec = -20, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 30);
assert(r.tv_nsec == 10L);
a.tv_sec = 0, a.tv_nsec = 10L;
b.tv_sec = 0, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 10L);
a.tv_sec = 0, a.tv_nsec = 0L;
b.tv_sec = 0, b.tv_nsec = 10L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == -1);
assert(r.tv_nsec == 1000000000L - 10L);
a.tv_sec = TIME_MIN, a.tv_nsec = 0L;
b.tv_sec = 0, b.tv_nsec = 0L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == TIME_MIN);
assert(r.tv_nsec == 0L);
a.tv_sec = TIME_MIN, a.tv_nsec = 0L;
b.tv_sec = 0, b.tv_nsec = 1L;
assert(libsimple_difftimespec(&r, &a, &b) == -1 && errno == ERANGE);
assert(r.tv_sec == TIME_MIN);
assert(r.tv_nsec == 0L);
a.tv_sec = TIME_MIN, a.tv_nsec = 0L;
b.tv_sec = -1, b.tv_nsec = 1L;
assert(!libsimple_difftimespec(&r, &a, &b));
assert(r.tv_sec == TIME_MIN);
assert(r.tv_nsec == 999999999L);
a.tv_sec = TIME_MAX, a.tv_nsec = 0L;
b.tv_sec = -1, b.tv_nsec = 0L;
assert(libsimple_difftimespec(&r, &a, &b) == -1 && errno == ERANGE);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_nsec == 999999999L);
return 0;
}
#endif
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