contrib/ntp/libntp/uglydate.c

   1 /*
   2  * uglydate - convert a time stamp to something barely readable
   3  *            The string returned is 37 characters long.
   4  */
   5 #include <stdio.h>
   6
   7 #include "ntp_fp.h"
   8 #include "ntp_unixtime.h"
   9 #include "lib_strbuf.h"
  10 #include "ntp_stdlib.h"
  11 #ifndef TM_IN_SYS_TIME
  12 #include <time.h>
  13 #endif
  14
  15 char *
  16 uglydate(
  17         l_fp *ts
  18         )
  19 {
  20         char *bp;
  21         char *timep;
  22         struct tm *tm;
  23         time_t sec;
  24         long msec;
  25         int year;
  26
  27         timep = ulfptoa(ts, 6);         /* returns max 17 characters */
  28         LIB_GETBUF(bp);
  29         sec = ts->l_ui - JAN_1970;
  30         msec = ts->l_uf / 4294967;      /* fract / (2**32/1000) */
  31         tm = gmtime(&sec);
  32         if (ts->l_ui == 0) {
  33                 /*
  34                  * Probably not a real good thing to do.  Oh, well.
  35                  */
  36                 year = 0;
  37                 tm->tm_yday = 0;
  38                 tm->tm_hour = 0;
  39                 tm->tm_min = 0;
  40                 tm->tm_sec = 0;
  41         } else {
  42                 year = tm->tm_year;
  43                 while (year >= 100)
  44                     year -= 100;
  45         }
  46         (void) sprintf(bp, "%17s %02d:%03d:%02d:%02d:%02d.%03ld",
  47                        timep, year, tm->tm_yday, tm->tm_hour, tm->tm_min,
  48                        tm->tm_sec, msec);
  49         return bp;
  50 }