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misc: add timespec_add()

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Daniel Eklöf 2022-09-22 18:32:28 +02:00
parent 020148d67c
commit 4db1dde25c
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GPG key ID: 5BBD4992C116573F
2 changed files with 19 additions and 1 deletions
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19
misc.c
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@ -13,15 +13,32 @@ isword(char32_t wc, bool spaces_only, const char32_t *delimiters)
return isc32graph(wc); return isc32graph(wc);
} }
void
timespec_add(const struct timespec *a, const struct timespec *b,
struct timespec *res)
{
const long one_sec_in_ns = 1000000000;
res->tv_sec = a->tv_sec + b->tv_sec;
res->tv_nsec = a->tv_nsec + b->tv_nsec;
/* tv_nsec may be negative */
if (res->tv_nsec >= one_sec_in_ns) {
res->tv_sec++;
res->tv_nsec -= one_sec_in_ns;
}
}
void void
timespec_sub(const struct timespec *a, const struct timespec *b, timespec_sub(const struct timespec *a, const struct timespec *b,
struct timespec *res) struct timespec *res)
{ {
const long one_sec_in_ns = 1000000000;
res->tv_sec = a->tv_sec - b->tv_sec; res->tv_sec = a->tv_sec - b->tv_sec;
res->tv_nsec = a->tv_nsec - b->tv_nsec; res->tv_nsec = a->tv_nsec - b->tv_nsec;
/* tv_nsec may be negative */ /* tv_nsec may be negative */
if (res->tv_nsec < 0) { if (res->tv_nsec < 0) {
res->tv_sec--; res->tv_sec--;
res->tv_nsec += 1000 * 1000 * 1000; res->tv_nsec += one_sec_in_ns;
} }
} }

1
misc.h
View file

@ -6,4 +6,5 @@
bool isword(char32_t wc, bool spaces_only, const char32_t *delimiters); bool isword(char32_t wc, bool spaces_only, const char32_t *delimiters);
void timespec_add(const struct timespec *a, const struct timespec *b, struct timespec *res);
void timespec_sub(const struct timespec *a, const struct timespec *b, struct timespec *res); void timespec_sub(const struct timespec *a, const struct timespec *b, struct timespec *res);