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/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
#ifndef TEST
int
libsimple_sumtimeval(struct timeval *sum, const struct timeval *augend, const struct timeval *addend)
{
time_t s;
if (LIBSIMPLE_SADD_OVERFLOW(augend->tv_sec, addend->tv_sec, &s, TIME_MIN, TIME_MAX)) {
if (addend->tv_sec > 0)
goto too_large;
else
goto too_small;
}
sum->tv_usec = augend->tv_usec + addend->tv_usec;
if (sum->tv_usec >= 1000000L) {
if (LIBSIMPLE_SINCR_OVERFLOW(&s, TIME_MAX))
goto too_large;
sum->tv_usec -= 1000000L;
}
sum->tv_sec = s;
return 0;
too_large:
sum->tv_sec = TIME_MAX;
sum->tv_usec = 999999L;
errno = ERANGE;
return -1;
too_small:
sum->tv_sec = TIME_MIN;
sum->tv_usec = 0;
errno = ERANGE;
return -1;
}
#else
#include "test.h"
int
main(void)
{
struct timeval r, a, b;
a.tv_sec = 0, a.tv_usec = 0;
b.tv_sec = 0, b.tv_usec = 0;
assert(!libsimple_sumtimeval(&r, &a, &b));
assert(r.tv_sec == 0);
assert(r.tv_usec == 0);
a.tv_sec = 10, a.tv_usec = 10000L;
b.tv_sec = 0, b.tv_usec = 0L;
assert(!libsimple_sumtimeval(&r, &a, &b));
assert(r.tv_sec == 10);
assert(r.tv_usec == 10000L);
a.tv_sec = 10, a.tv_usec = 10000L;
b.tv_sec = -10, b.tv_usec = 0L;
assert(!libsimple_sumtimeval(&r, &a, &b));
assert(r.tv_sec == 0);
assert(r.tv_usec == 10000L);
a.tv_sec = 10, a.tv_usec = 10000L;
b.tv_sec = -20, b.tv_usec = 20000L;
assert(!libsimple_sumtimeval(&r, &a, &b));
assert(r.tv_sec == -10);
assert(r.tv_usec == 30000L);
a.tv_sec = 1, a.tv_usec = 999999L;
b.tv_sec = 1, b.tv_usec = 1L;
assert(!libsimple_sumtimeval(&r, &a, &b));
assert(r.tv_sec == 3);
assert(r.tv_usec == 0L);
a.tv_sec = TIME_MAX, a.tv_usec = 0L;
b.tv_sec = TIME_MAX, b.tv_usec = 0L;
assert(libsimple_sumtimeval(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_usec == 999999L);
a.tv_sec = TIME_MAX, a.tv_usec = 999999L;
b.tv_sec = 0, b.tv_usec = 1L;
assert(libsimple_sumtimeval(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_usec == 999999L);
a.tv_sec = TIME_MAX, a.tv_usec = 1L;
b.tv_sec = 0, b.tv_usec = 999999L;
assert(libsimple_sumtimeval(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MAX);
assert(r.tv_usec == 999999L);
a.tv_sec = TIME_MIN, a.tv_usec = 0L;
b.tv_sec = TIME_MIN, b.tv_usec = 0L;
assert(libsimple_sumtimeval(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MIN);
assert(r.tv_usec == 0L);
a.tv_sec = TIME_MIN, a.tv_usec = 100L;
b.tv_sec = TIME_MIN, b.tv_usec = 100L;
assert(libsimple_sumtimeval(&r, &a, &b) == -1);
assert(r.tv_sec == TIME_MIN);
assert(r.tv_usec == 0L);
return 0;
}
#endif
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