time: new module for dealing with time.

[ccan] / ccan / time / time.c

diff --git a/ccan/time/time.c b/ccan/time/time.c
new file mode 100644 (file)
index 0000000..1f36c08
--- /dev/null
+++ b/ccan/time/time.c
@@ -0,0 +1,107 @@
+#include <ccan/time/time.h>
+#include <stdlib.h>
+#include <assert.h>
+
+struct timeval time_now(void)
+{
+       struct timeval now;
+       gettimeofday(&now, NULL);
+       return now;
+}
+
+bool time_greater(struct timeval a, struct timeval b)
+{
+       if (a.tv_sec > b.tv_sec)
+               return true;
+       else if (a.tv_sec < b.tv_sec)
+                return false;
+
+       return a.tv_usec > b.tv_usec;
+}
+
+bool time_less(struct timeval a, struct timeval b)
+{
+       if (a.tv_sec < b.tv_sec)
+               return true;
+       else if (a.tv_sec > b.tv_sec)
+                return false;
+
+       return a.tv_usec < b.tv_usec;
+}
+
+bool time_eq(struct timeval a, struct timeval b)
+{
+       return a.tv_sec == b.tv_sec && a.tv_usec == b.tv_usec;
+}
+
+struct timeval time_sub(struct timeval recent, struct timeval old)
+{
+       struct timeval diff;
+
+       diff.tv_sec = recent.tv_sec - old.tv_sec;
+       if (old.tv_usec > recent.tv_usec) {
+               diff.tv_sec--;
+               diff.tv_usec = 1000000 + recent.tv_usec - old.tv_usec;
+       } else
+               diff.tv_usec = recent.tv_usec - old.tv_usec;
+
+       assert(diff.tv_sec >= 0);
+       return diff;
+}
+
+struct timeval time_add(struct timeval a, struct timeval b)
+{
+       struct timeval sum;
+
+       sum.tv_sec = a.tv_sec + b.tv_sec;
+       sum.tv_usec = a.tv_usec + b.tv_usec;
+       if (sum.tv_usec > 1000000) {
+               sum.tv_sec++;
+               sum.tv_usec -= 1000000;
+       }
+       return sum;
+}
+
+struct timeval time_divide(struct timeval t, unsigned long div)
+{
+       return time_from_usec(time_to_usec(t) / div);
+}
+
+struct timeval time_multiply(struct timeval t, unsigned long mult)
+{
+       return time_from_usec(time_to_usec(t) * mult);
+}
+
+uint64_t time_to_msec(struct timeval t)
+{
+       uint64_t msec;
+
+       msec = t.tv_usec / 1000 + (uint64_t)t.tv_sec * 1000;
+       return msec;
+}
+
+uint64_t time_to_usec(struct timeval t)
+{
+       uint64_t usec;
+
+       usec = t.tv_usec + (uint64_t)t.tv_sec * 1000000;
+       return usec;
+}
+
+struct timeval time_from_msec(uint64_t msec)
+{
+       struct timeval t;
+
+       t.tv_usec = (msec % 1000) * 1000;
+       t.tv_sec = msec / 1000;
+       return t;
+}
+
+struct timeval time_from_usec(uint64_t usec)
+{
+       struct timeval t;
+
+       t.tv_usec = usec % 1000000;
+       t.tv_sec = usec / 1000000;
+       return t;
+}