skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
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time_from_tai.c (409B)

      1  /* ISC license. */
      2 
      3 #include <skalibs/sysdeps.h>
      4 #include <skalibs/bsdsnowflake.h>
      5 #include <time.h>
      6 #include <errno.h>
      7 #include <skalibs/uint64.h>
      8 #include <skalibs/tai.h>
      9 
     10 int time_from_tai (time_t *u, tai const *t)
     11 {
     12   uint64_t uu = t->x - TAI_MAGIC ;
     13 #if SKALIBS_SIZEOFTIME < 8
     14   if ((uu >> 32) && (uu >> 32) != 0xffffffffUL)
     15     return (errno = EOVERFLOW, 0) ;
     16 #endif
     17   *u = (time_t)uu ;
     18   return 1 ;
     19 }