tree-wide: use timestamp_is_set() more

src/basic/fileio.c

@@ -1195,7 +1195,7 @@ int write_timestamp_file_atomic(const char *fn, usec_t n) {
         /* Creates a "timestamp" file, that contains nothing but a
          * usec_t timestamp, formatted in ASCII. */
 
-        if (n <= 0 || n >= USEC_INFINITY)
+        if (!timestamp_is_set(n))
                 return -ERANGE;
 
         xsprintf(ln, USEC_FMT "\n", n);
@@ -1216,7 +1216,7 @@ int read_timestamp_file(const char *fn, usec_t *ret) {
         if (r < 0)
                 return r;
 
-        if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
+        if (!timestamp_is_set(t))
                 return -ERANGE;
 
         *ret = (usec_t) t;

src/basic/time-util.c

@@ -126,7 +126,7 @@ usec_t map_clock_usec(usec_t from, clockid_t from_clock, clockid_t to_clock) {
 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
         assert(ts);
 
-        if (u == USEC_INFINITY || u == 0) {
+        if (!timestamp_is_set(u)) {
                 ts->realtime = ts->monotonic = u;
                 return ts;
         }
@@ -141,7 +141,7 @@ triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u)
 
         assert(ts);
 
-        if (u == USEC_INFINITY || u == 0) {
+        if (!timestamp_is_set(u)) {
                 ts->realtime = ts->monotonic = ts->boottime = u;
                 return ts;
         }
@@ -349,7 +349,7 @@ char *format_timestamp_style(
                           1 + 1 +              /* space and shortest possible zone */
                           1))
                 return NULL; /* Not enough space even for the shortest form. */
-        if (t <= 0 || t == USEC_INFINITY)
+        if (!timestamp_is_set(t))
                 return NULL; /* Timestamp is unset */
 
         if (style == TIMESTAMP_UNIX) {
@@ -427,7 +427,7 @@ char *format_timestamp_relative(char *buf, size_t l, usec_t t) {
         const char *s;
         usec_t n, d;
 
-        if (t <= 0 || t == USEC_INFINITY)
+        if (!timestamp_is_set(t))
                 return NULL;
 
         n = now(CLOCK_REALTIME);

src/basic/xattr-util.c

@@ -199,7 +199,7 @@ int fd_setcrtime(int fd, usec_t usec) {
 
         assert(fd >= 0);
 
-        if (IN_SET(usec, 0, USEC_INFINITY))
+        if (!timestamp_is_set(usec))
                 usec = now(CLOCK_REALTIME);
 
         le = htole64((uint64_t) usec);