mirrors/foot
1
0
Fork 0
mirror of https://codeberg.org/dnkl/foot.git synced 2026-02-04 04:06:06 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

misc: add timespec_add()

Browse source
This commit is contained in:
Daniel Eklöf 2022-09-22 18:32:28 +02:00
parent 020148d67c
commit 4db1dde25c
No known key found for this signature in database
GPG key ID: 5BBD4992C116573F
2 changed files with 19 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

19
misc.c
View file

@ -13,15 +13,32 @@ isword(char32_t wc, bool spaces_only, const char32_t *delimiters)
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
timespec_sub(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 < 0) {
res->tv_sec--;
res->tv_nsec += 1000 * 1000 * 1000;
res->tv_nsec += one_sec_in_ns;
}
}