xref: /freebsd/contrib/ntp/libntp/uglydate.c (revision 40a8ac8f62b535d30349faf28cf47106b7041b83)
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 
12 
13 char *
14 uglydate(
15 	l_fp *ts
16 	)
17 {
18 	char *bp;
19 	char *timep;
20 	struct tm *tm;
21 	time_t sec;
22 	long msec;
23 	int year;
24 
25 	timep = ulfptoa(ts, 6);		/* returns max 17 characters */
26 	LIB_GETBUF(bp);
27 	sec = ts->l_ui - JAN_1970;
28 	msec = ts->l_uf / 4294967;	/* fract / (2**32/1000) */
29 	tm = gmtime(&sec);
30 	if (ts->l_ui == 0) {
31 		/*
32 		 * Probably not a real good thing to do.  Oh, well.
33 		 */
34 		year = 0;
35 		tm->tm_yday = 0;
36 		tm->tm_hour = 0;
37 		tm->tm_min = 0;
38 		tm->tm_sec = 0;
39 	} else {
40 		year = tm->tm_year;
41 		while (year >= 100)
42 		    year -= 100;
43 	}
44 	(void) sprintf(bp, "%17s %02d:%03d:%02d:%02d:%02d.%03ld",
45 		       timep, year, tm->tm_yday, tm->tm_hour, tm->tm_min,
46 		       tm->tm_sec, msec);
47 	return bp;
48 }
49