1/*
2 * ntp_unixtime.h - contains constants and macros for converting between
3 *		    NTP time stamps (l_fp) and Unix times (struct timeval)
4 */
5
6#include "ntp_types.h"
7
8#ifdef SIM
9#include "ntpsim.h"
10#endif
11
12#ifdef SIM
13#   define GETTIMEOFDAY(a, b) (node_gettime(&ntp_node, a))
14#   define SETTIMEOFDAY(a, b) (node_settime(&ntp_node, a))
15#   define ADJTIMEOFDAY(a, b) (node_adjtime(&ntp_node, a, b))
16#else
17#   define ADJTIMEOFDAY(a, b) (adjtime(a, b))
18/* gettimeofday() takes two args in BSD and only one in SYSV */
19# if defined(HAVE_SYS_TIMERS_H) && defined(HAVE_GETCLOCK)
20#  include <sys/timers.h>
21int getclock (int clock_type, struct timespec *tp);
22/* Don't #define GETTIMEOFDAY because we shouldn't be using it in this case. */
23#   define SETTIMEOFDAY(a, b) (settimeofday(a, b))
24# else /* not (HAVE_SYS_TIMERS_H && HAVE_GETCLOCK) */
25#  ifdef SYSV_TIMEOFDAY
26#   define GETTIMEOFDAY(a, b) (gettimeofday(a))
27#   define SETTIMEOFDAY(a, b) (settimeofday(a))
28#  else /* ! SYSV_TIMEOFDAY */
29#if defined SYS_CYGWIN32
30#   define GETTIMEOFDAY(a, b) (gettimeofday(a, b))
31#   define SETTIMEOFDAY(a, b) (settimeofday_NT(a))
32#else
33#   define GETTIMEOFDAY(a, b) (gettimeofday(a, b))
34#   define SETTIMEOFDAY(a, b) (settimeofday(a, b))
35#endif
36#  endif /* SYSV_TIMEOFDAY */
37# endif /* not (HAVE_SYS_TIMERS_H && HAVE_GETCLOCK) */
38#endif /* SIM */
39
40/*
41 * Time of day conversion constant.  Ntp's time scale starts in 1900,
42 * Unix in 1970.
43 */
44#define	JAN_1970	0x83aa7e80	/* 2208988800 1970 - 1900 in seconds */
45
46/*
47 * These constants are used to round the time stamps computed from
48 * a struct timeval to the microsecond (more or less).  This keeps
49 * things neat.
50 */
51#define	TS_MASK		0xfffff000	/* mask to usec, for time stamps */
52#define	TS_ROUNDBIT	0x00000800	/* round at this bit */
53
54
55/*
56 * Convert usec to a time stamp fraction.  If you use this the program
57 * must include the following declarations:
58 */
59extern u_long ustotslo[];
60extern u_long ustotsmid[];
61extern u_long ustotshi[];
62
63#define	TVUTOTSF(tvu, tsf) \
64	(tsf) = ustotslo[(tvu) & 0xff] \
65	    + ustotsmid[((tvu) >> 8) & 0xff] \
66	    + ustotshi[((tvu) >> 16) & 0xf]
67
68/*
69 * Convert a struct timeval to a time stamp.
70 */
71#define TVTOTS(tv, ts) \
72	do { \
73		(ts)->l_ui = (u_long)(tv)->tv_sec; \
74		TVUTOTSF((tv)->tv_usec, (ts)->l_uf); \
75	} while(0)
76
77#define sTVTOTS(tv, ts) \
78	do { \
79		int isneg = 0; \
80		long usec; \
81		(ts)->l_ui = (tv)->tv_sec; \
82		usec = (tv)->tv_usec; \
83		if (((tv)->tv_sec < 0) || ((tv)->tv_usec < 0)) { \
84			usec = -usec; \
85			(ts)->l_ui = -(ts)->l_ui; \
86			isneg = 1; \
87		} \
88		TVUTOTSF(usec, (ts)->l_uf); \
89		if (isneg) { \
90			L_NEG((ts)); \
91		} \
92	} while(0)
93
94/*
95 * TV_SHIFT is used to turn the table result into a usec value.  To round,
96 * add in TV_ROUNDBIT before shifting
97 */
98#define	TV_SHIFT	3
99#define	TV_ROUNDBIT	0x4
100
101
102/*
103 * Convert a time stamp fraction to microseconds.  The time stamp
104 * fraction is assumed to be unsigned.  To use this in a program, declare:
105 */
106extern long tstouslo[];
107extern long tstousmid[];
108extern long tstoushi[];
109
110#define	TSFTOTVU(tsf, tvu) \
111	(tvu) = (tstoushi[((tsf) >> 24) & 0xff] \
112	    + tstousmid[((tsf) >> 16) & 0xff] \
113	    + tstouslo[((tsf) >> 9) & 0x7f] \
114	    + TV_ROUNDBIT) >> TV_SHIFT
115/*
116 * Convert a time stamp to a struct timeval.  The time stamp
117 * has to be positive.
118 */
119#define	TSTOTV(ts, tv) \
120	do { \
121		(tv)->tv_sec = (ts)->l_ui; \
122		TSFTOTVU((ts)->l_uf, (tv)->tv_usec); \
123		if ((tv)->tv_usec == 1000000) { \
124			(tv)->tv_sec++; \
125			(tv)->tv_usec = 0; \
126		} \
127	} while (0)
128
129/*
130 * Convert milliseconds to a time stamp fraction.  This shouldn't be
131 * here, but it is convenient since the guys who use the definition will
132 * often be including this file anyway.
133 */
134extern u_long msutotsflo[];
135extern u_long msutotsfhi[];
136
137#define	MSUTOTSF(msu, tsf) \
138	(tsf) = msutotsfhi[((msu) >> 5) & 0x1f] + msutotsflo[(msu) & 0x1f]
139
140extern	char *	tvtoa		P((const struct timeval *));
141extern	char *	utvtoa		P((const struct timeval *));
142