xref: /freebsd/contrib/ntp/libntp/uglydate.c (revision daf1cffce2e07931f27c6c6998652e90df6ba87e)
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 }
51