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Minor code improvement to timespec_subtract example

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This saves a few instructions.
BORROW cannot be -1, since NSEC_DIFF is at most 999999999.
Idea taken from Gnulib, here:
https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=fe33f943054b93af8b965ce6564b8713b0979a21
This commit is contained in:
Paul Eggert 2024-06-15 08:40:41 -07:00
parent ee768a30fe
commit 7c1ec1b7d0
1 changed files with 3 additions and 3 deletions
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6
manual/examples/timespec_subtract.c
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@ -22,12 +22,12 @@
bool bool
timespec_subtract (struct timespec *r, timespec_subtract (struct timespec *r,
struct timespec x, struct timespec y) struct timespec x, struct timespec y)
{ {
/* Compute nanoseconds, setting @var{borrow} to 1, 0, or -1 /* Compute nanoseconds, setting @var{borrow} to 1 or 0
for propagation into seconds. */ for propagation into seconds. */
long int nsec_diff = x.tv_nsec - y.tv_nsec; long int nsec_diff = x.tv_nsec - y.tv_nsec;
int borrow = (nsec_diff < 0) - ! (nsec_diff < 1000000000); bool borrow = nsec_diff < 0;
r->tv_nsec = nsec_diff + 1000000000 * borrow; r->tv_nsec = nsec_diff + 1000000000 * borrow;
/* Compute seconds, returning true if this overflows. */ /* Compute seconds, returning true if this overflows. */