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time-util: simplify overflow check

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And don't rely on 2s complement.
This commit is contained in:
Lennart Poettering 2021-03-02 21:33:35 +01:00 committed by Yu Watanabe
parent 294f1b40ab
commit ab05bee1dd
1 changed files with 2 additions and 4 deletions
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6
src/basic/time-util.h
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@ -155,16 +155,14 @@ usec_t jiffies_to_usec(uint32_t jiffies);
bool in_utc_timezone(void);
static inline usec_t usec_add(usec_t a, usec_t b) {
usec_t c;
/* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output, and doesn't
* overflow. */
c = a + b;
if (c < a || c < b) /* overflow check */
if (a > USEC_INFINITY - b) /* overflow check */
return USEC_INFINITY;
return c;
return a + b;
}
static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {