lib/ccan/time/time.c

   1 /* Licensed under BSD-MIT - see LICENSE file for details */
   2 #include <ccan/time/time.h>
   3 #include <stdlib.h>
   4 #include <assert.h>
   5
   6 struct timeval time_now(void)
   7 {
   8         struct timeval now;
   9         gettimeofday(&now, NULL);
  10         return now;
  11 }
  12
  13 bool time_greater(struct timeval a, struct timeval b)
  14 {
  15         if (a.tv_sec > b.tv_sec)
  16                 return true;
  17         else if (a.tv_sec < b.tv_sec)
  18                  return false;
  19
  20         return a.tv_usec > b.tv_usec;
  21 }
  22
  23 bool time_less(struct timeval a, struct timeval b)
  24 {
  25         if (a.tv_sec < b.tv_sec)
  26                 return true;
  27         else if (a.tv_sec > b.tv_sec)
  28                  return false;
  29
  30         return a.tv_usec < b.tv_usec;
  31 }
  32
  33 bool time_eq(struct timeval a, struct timeval b)
  34 {
  35         return a.tv_sec == b.tv_sec && a.tv_usec == b.tv_usec;
  36 }
  37
  38 struct timeval time_sub(struct timeval recent, struct timeval old)
  39 {
  40         struct timeval diff;
  41
  42         diff.tv_sec = recent.tv_sec - old.tv_sec;
  43         if (old.tv_usec > recent.tv_usec) {
  44                 diff.tv_sec--;
  45                 diff.tv_usec = 1000000 + recent.tv_usec - old.tv_usec;
  46         } else
  47                 diff.tv_usec = recent.tv_usec - old.tv_usec;
  48
  49         assert(diff.tv_sec >= 0);
  50         return diff;
  51 }
  52
  53 struct timeval time_add(struct timeval a, struct timeval b)
  54 {
  55         struct timeval sum;
  56
  57         sum.tv_sec = a.tv_sec + b.tv_sec;
  58         sum.tv_usec = a.tv_usec + b.tv_usec;
  59         if (sum.tv_usec > 1000000) {
  60                 sum.tv_sec++;
  61                 sum.tv_usec -= 1000000;
  62         }
  63         return sum;
  64 }
  65
  66 struct timeval time_divide(struct timeval t, unsigned long div)
  67 {
  68         return time_from_usec(time_to_usec(t) / div);
  69 }
  70
  71 struct timeval time_multiply(struct timeval t, unsigned long mult)
  72 {
  73         return time_from_usec(time_to_usec(t) * mult);
  74 }
  75
  76 uint64_t time_to_msec(struct timeval t)
  77 {
  78         uint64_t msec;
  79
  80         msec = t.tv_usec / 1000 + (uint64_t)t.tv_sec * 1000;
  81         return msec;
  82 }
  83
  84 uint64_t time_to_usec(struct timeval t)
  85 {
  86         uint64_t usec;
  87
  88         usec = t.tv_usec + (uint64_t)t.tv_sec * 1000000;
  89         return usec;
  90 }
  91
  92 struct timeval time_from_msec(uint64_t msec)
  93 {
  94         struct timeval t;
  95
  96         t.tv_usec = (msec % 1000) * 1000;
  97         t.tv_sec = msec / 1000;
  98         return t;
  99 }
 100
 101 struct timeval time_from_usec(uint64_t usec)
 102 {
 103         struct timeval t;
 104
 105         t.tv_usec = usec % 1000000;
 106         t.tv_sec = usec / 1000000;
 107         return t;
 108 }