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/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
#ifndef TEST
int
libsimple_sumtimespec(struct timespec *sum, const struct timespec *augend, const struct timespec *addend)
{
long int ns = augend->tv_nsec + addend->tv_nsec;
time_t s;
int ret = 0;
s = augend->tv_sec + addend->tv_sec;
if ((augend->tv_sec < 0) == (addend->tv_sec < 0)) {
if (augend->tv_sec >= 0 && augend->tv_sec > TIME_MAX - addend->tv_sec) {
s = TIME_MAX;
ns = 999999999L;
errno = ERANGE;
ret = -1;
} else if (augend->tv_sec < 0 && augend->tv_sec < TIME_MIN - addend->tv_sec) {
s = TIME_MIN;
ns = 0;
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;
}
}
sum->tv_sec = s;
sum->tv_nsec = ns;
return ret;
}
#else
#include "test.h"
int
main(void)
{
struct timespec r, a, b;
a.tv_sec = 0, a.tv_nsec = 0;
b.tv_sec = 0, b.tv_nsec = 0;
assert(!libsimple_sumtimespec(&r, &a, &b));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0);
a.tv_sec = 10, a.tv_nsec = 10000L;
b.tv_sec = 0, b.tv_nsec = 0L;
assert(!libsimple_sumtimespec(&r, &a, &b));
assert(r.tv_sec == 10);
assert(r.tv_nsec == 10000L);
a.tv_sec = 10, a.tv_nsec = 10000L;
b.tv_sec = -10, b.tv_nsec = 0L;
assert(!libsimple_sumtimespec(&r, &a, &b));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 10000L);
a.tv_sec = 10, a.tv_nsec = 10000L;
b.tv_sec = -20, b.tv_nsec = 20000L;
assert(!libsimple_sumtimespec(&r, &a, &b));
assert(r.tv_sec == -10);
assert(r.tv_nsec == 30000L);
a.tv_sec = 1, a.tv_nsec = 999999999L;
b.tv_sec = 1, b.tv_nsec = 1L;
assert(!libsimple_sumtimespec(&r, &a, &b));
assert(r.tv_sec == 3);
assert(r.tv_nsec == 0L);
a.tv_sec = TIME_MAX, a.tv_nsec = 0L;
b.tv_sec = TIME_MAX, b.tv_nsec = 0L;
assert(libsimple_sumtimespec(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_nsec == 999999999L);
a.tv_sec = TIME_MAX, a.tv_nsec = 999999999L;
b.tv_sec = 0, b.tv_nsec = 1L;
assert(libsimple_sumtimespec(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_nsec == 999999999L);
a.tv_sec = TIME_MAX, a.tv_nsec = 1L;
b.tv_sec = 0, b.tv_nsec = 999999999L;
assert(libsimple_sumtimespec(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_nsec == 999999999L);
a.tv_sec = TIME_MIN, a.tv_nsec = 0L;
b.tv_sec = TIME_MIN, b.tv_nsec = 0L;
assert(libsimple_sumtimespec(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MIN);
assert(r.tv_nsec == 0L);
a.tv_sec = TIME_MIN, a.tv_nsec = 100L;
b.tv_sec = TIME_MIN, b.tv_nsec = 100L;
assert(libsimple_sumtimespec(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MIN);
assert(r.tv_nsec == 0L);
return 0;
}
#endif
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