/* 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)
{
long int ns = minuend->tv_nsec - subtrahend->tv_nsec;
time_t s;
int ret = 0;
s = minuend->tv_sec - subtrahend->tv_sec;
if ((minuend->tv_sec <= 0) != (subtrahend->tv_sec <= 0)) {
if (minuend->tv_sec < 0 && minuend->tv_sec < TIME_MIN + subtrahend->tv_sec) {
s = TIME_MIN;
ns = 0;
errno = ERANGE;
ret = -1;
} else if (minuend->tv_sec >= 0 && minuend->tv_sec > TIME_MAX + subtrahend->tv_sec) {
s = TIME_MAX;
ns = 999999999L;
errno = ERANGE;
ret = -1;
}
}
if (ns < 0) {
if (s == TIME_MIN) {
ns = 0L;
errno = ERANGE;
ret = -1;
} else {
s -= 1;
ns += 1000000000L;
}
} else if (ns >= 1000000000L) {
if (s == TIME_MAX) {
ns = 999999999L;
errno = ERANGE;
ret = -1;
} else {
s += 1;
ns -= 1000000000L;
}
}
diff->tv_sec = s;
diff->tv_nsec = ns;
return ret;
}
#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
