skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
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localtm_from_ltm64.c (585B)

      1 /* ISC license. */
      2 
      3 #include <skalibs/sysdeps.h>
      4 #include <skalibs/bsdsnowflake.h>
      5 #include <errno.h>
      6 #include <time.h>
      7 #include <skalibs/uint64.h>
      8 #include <skalibs/tai.h>
      9 #include <skalibs/djbtime.h>
     10 
     11 int localtm_from_ltm64 (struct tm *l, uint64_t uu, int tzh)
     12 {
     13   time_t u ;
     14   if (uu < TAI_MAGIC) return (errno = EINVAL, 0) ;
     15   uu -= TAI_MAGIC ;
     16 #if SKALIBS_SIZEOFTIME != 8
     17   if (uu > 0xFFFFFFFFUL) return (errno = EOVERFLOW, 0) ;
     18 #endif
     19   u = (time_t)uu - !!(tzh & 2) ;
     20   if (tzh & 1 ? !localtime_r(&u, l) : !gmtime_r(&u, l)) return 0 ;
     21   if (tzh & 2) l->tm_sec++ ;
     22   return 1 ;
     23 }