diff options
| -rw-r--r-- | src/timespec-util.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/timespec-util.h b/src/timespec-util.h index d37568d..d3c53bd 100644 --- a/src/timespec-util.h +++ b/src/timespec-util.h @@ -290,4 +290,22 @@ timespec_add(struct timespec *r, } } +/** + * Saturating timespec subtraction + * + * \param r[out] result: max(a - b, 0) + * \param a[in] operand + * \param b[in] operand + */ +static inline void +timespec_sub_saturate(struct timespec *r, + const struct timespec *a, const struct timespec *b) +{ + timespec_sub(r, a, b); + if (r->tv_sec < 0) { + r->tv_sec = 0; + r->tv_nsec = 0; + } +} + #endif /* TIMESPEC_UTIL_H */ |