bug-2803.c revision 290001 
1#include <config.h>
2
3#include <stdio.h>
4#include <sys/time.h>
5
6#include <ntp_fp.h>
7#include <timevalops.h>
8
9/* microseconds per second */
10#define MICROSECONDS 1000000
11
12
13static int verbose = 1;        // if not 0, also print results if test passed
14static int exit_on_err = 0;    // if not 0, exit if test failed
15
16
17/*
18 * Test function calling the old and new code mentioned in
19 * http://bugs.ntp.org/show_bug.cgi?id=2803#c22
20 */
21static
22int do_test( struct timeval timetv, struct timeval tvlast )
23{
24	struct timeval tvdiff_old;
25	struct timeval tvdiff_new;
26
27	int cond_old;
28	int cond_new;
29	int failed;
30
31	cond_old = 0;
32	cond_new = 0;
33
34	// Here is the old code:
35	tvdiff_old = abs_tval(sub_tval(timetv, tvlast));
36	if (tvdiff_old.tv_sec > 0) {
37		cond_old = 1;
38	}
39
40	// Here is the new code:
41	tvdiff_new = sub_tval(timetv, tvlast);
42	if (tvdiff_new.tv_sec != 0) {
43		cond_new = 1;
44	}
45
46	failed = cond_new != cond_old;
47
48	if ( failed || verbose )
49		printf( "timetv %lli|%07li, tvlast  %lli|%07li: tvdiff_old: %lli|%07li -> %i, tvdiff_new: %lli|%07li -> %i, same cond: %s\n",
50			(long long) timetv.tv_sec, timetv.tv_usec,
51			(long long) tvlast.tv_sec, tvlast.tv_usec,
52			(long long) tvdiff_old.tv_sec, tvdiff_old.tv_usec, cond_old,
53			(long long) tvdiff_new.tv_sec, tvdiff_new.tv_usec, cond_new,
54			failed ? "NO <<" : "yes" );
55
56	return failed ? -1 : 0;
57}
58
59
60
61/*
62 * Call the test function in a loop for a given set of parameters.
63 * Both timetv and tvlast iterate over the given range, in all combinations.
64 */
65static
66int test_loop( long long start_sec, long start_usec,
67	       long long stop_sec, long stop_usec,
68	       long long step_sec, long step_usec )
69{
70	struct timeval timetv;
71	struct timeval tvlast;
72
73	for ( timetv.tv_sec = start_sec; timetv.tv_sec <= stop_sec; timetv.tv_sec += step_sec )
74	  for ( timetv.tv_usec = start_usec; timetv.tv_usec <= stop_usec; timetv.tv_usec += step_usec )
75	    for ( tvlast.tv_sec = start_sec; tvlast.tv_sec <= stop_sec; tvlast.tv_sec += step_sec )
76	      for ( tvlast.tv_usec = start_usec; tvlast.tv_usec <= stop_usec; tvlast.tv_usec += step_usec )
77	      {
78		int rc = do_test( timetv, tvlast );
79		if (rc < 0 && exit_on_err )
80			return rc;
81	      }
82
83	return 0;
84}
85
86
87
88int main2( void )
89{
90
91	// loop from {0.0} to {1.1000000} stepping by tv_sec by 1 and tv_usec by 100000
92	test_loop( 0, 0,   1,  MICROSECONDS,   1,  MICROSECONDS / 10 );
93
94	// test_loop( 0, 0,   5,  MICROSECONDS,   1,  MICROSECONDS / 1000 );
95	// test_loop( 0, 0,  -5, -MICROSECONDS,  -1, -MICROSECONDS / 1000 );
96
97	return 0;
98}
99
100