/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
#ifndef TEST
int
libsimple_multimespec(struct timespec *prod, const struct timespec *multiplicand, int multiplier)
{
time_t s = multiplicand->tv_sec;
long long int ns = (long long int)(multiplicand->tv_nsec);
long long int xs;
int neg = (s < 0) ^ (multiplier < 0);
if (multiplier == 0 || multiplier == 1) {
prod->tv_sec = multiplier * multiplicand->tv_sec;
prod->tv_nsec = multiplier * multiplicand->tv_nsec;
return 0;
}
if (s < 0) {
if (TIME_MIN != -TIME_MAX && s == TIME_MIN)
goto overflow;
s = -s;
if (ns)
ns = 1000000000L - ns;
}
if (multiplier < 0)
multiplier = -multiplier;
ns *= multiplier;
xs = ns / 1000000000L;
ns %= 1000000000L;
if (s > TIME_MAX / multiplier)
goto overflow;
s *= multiplier;
if (s > TIME_MAX - (time_t)xs)
goto overflow;
s += (time_t)xs;
if (neg) {
s = -s;
if (ns) {
if (s == TIME_MIN)
goto overflow;
ns = 1000000000L - ns;
s -= 1;
}
}
prod->tv_sec = s;
prod->tv_nsec = ns;
return 0;
overflow:
if (neg) {
prod->tv_sec = TIME_MIN;
prod->tv_nsec = 0;
} else {
prod->tv_sec = TIME_MAX;
prod->tv_nsec = 999999999L;
}
errno = ERANGE;
return -1;
}
#else
#include "test.h"
int
main(void)
{
struct timespec r, a;
a.tv_sec = 0, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, 0));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, 0));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 0, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, 0));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, 0));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 0, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, 1));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, 1));
assert(r.tv_sec == 10);
assert(r.tv_nsec == 0L);
a.tv_sec = 0, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, 1));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 10L);
a.tv_sec = 10, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, 1));
assert(r.tv_sec == 10);
assert(r.tv_nsec == 10L);
a.tv_sec = 0, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, 10));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, 10));
assert(r.tv_sec == 100);
assert(r.tv_nsec == 0L);
a.tv_sec = 0, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, 10));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 100L);
a.tv_sec = 10, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, 10));
assert(r.tv_sec == 100);
assert(r.tv_nsec == 100L);
a.tv_sec = 0, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, -1));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, -1));
assert(r.tv_sec == -10);
assert(r.tv_nsec == 0L);
a.tv_sec = 0, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, -1));
assert(r.tv_sec == -1);
assert(r.tv_nsec == 1000000000L - 10L);
a.tv_sec = 10, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, -1));
assert(r.tv_sec == -11);
assert(r.tv_nsec == 1000000000L - 10L);
a.tv_sec = 0, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, -10));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0L);
a.tv_sec = 10, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, -10));
assert(r.tv_sec == -100);
assert(r.tv_nsec == 0L);
a.tv_sec = 0, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, -10));
assert(r.tv_sec == -1);
assert(r.tv_nsec == 1000000000L - 100L);
a.tv_sec = 10, a.tv_nsec = 10L;
assert(!libsimple_multimespec(&r, &a, -10));
assert(r.tv_sec == -101);
assert(r.tv_nsec == 1000000000L - 100L);
a.tv_sec = TIME_MAX, a.tv_nsec = 999999999L;
assert(!libsimple_multimespec(&r, &a, 0));
assert(r.tv_sec == 0);
assert(r.tv_nsec == 0);
a.tv_sec = TIME_MAX, a.tv_nsec = 999999999L;
assert(!libsimple_multimespec(&r, &a, 1));
assert(r.tv_sec == TIME_MAX);
assert(r.tv_nsec == 999999999L);
a.tv_sec = TIME_MAX, a.tv_nsec = 0L;
assert(libsimple_multimespec(&r, &a, 2) == -1 && errno == ERANGE);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_nsec == 999999999L);
a.tv_sec = TIME_MAX, a.tv_nsec = 0L;
assert(libsimple_multimespec(&r, &a, -2) == -1 && errno == ERANGE);
assert(r.tv_sec == TIME_MIN);
assert(r.tv_nsec == 0L);
a.tv_sec = TIME_MAX, a.tv_nsec = 0L;
assert(!libsimple_multimespec(&r, &a, -1));
assert(r.tv_sec == -TIME_MAX);
assert(r.tv_nsec == 0L);
if (-TIME_MAX > TIME_MIN) {
a.tv_sec = TIME_MAX, a.tv_nsec = 999999999L;
assert(!libsimple_multimespec(&r, &a, -1));
assert(r.tv_sec == -TIME_MAX - (time_t)1);
assert(r.tv_nsec == 1L);
}
a.tv_sec = 10, a.tv_nsec = 100000001L;
assert(!libsimple_multimespec(&r, &a, 10));
assert(r.tv_sec == 101);
assert(r.tv_nsec == 10L);
return 0;
}
#endif
