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/**********************************************************************
* Copyright (c) David L. Mills 1992-2001 *
* *
* Permission to use, copy, modify, and distribute this software and *
* its documentation for any purpose and without fee is hereby *
* granted, provided that the above copyright notice appears in all *
* copies and that both the copyright notice and this permission *
* notice appear in supporting documentation, and that the name *
* University of Delaware not be used in advertising or publicity *
* pertaining to distribution of the software without specific, *
* written prior permission. The University of Delaware makes no *
* representations about the suitability this software for any *
* purpose. It is provided "as is" without express or implied *
* warranty. *
* *
***********************************************************************/
#ifndef _LIBPRELUDE_NTP_H
#define _LIBPRELUDE_NTP_H
#define TS_MASK 0xfffff000 /* mask to usec, for time stamps */
#define TS_ROUNDBIT 0x00000800 /* round at this bit */
#define JAN_1970 0x83aa7e80 /* 2208988800 1970 - 1900 in seconds */
typedef int32_t s_fp;
typedef struct {
union {
uint32_t Xl_ui;
int32_t Xl_i;
} Ul_i;
union {
uint32_t Xl_uf;
int32_t Xl_f;
} Ul_f;
} l_fp;
#define l_ui Ul_i.Xl_ui /* unsigned integral part */
#define l_i Ul_i.Xl_i /* signed integral part */
#define l_uf Ul_f.Xl_uf /* unsigned fractional part */
#define l_f Ul_f.Xl_f /* signed fractional part */
extern const unsigned long ustotslo[];
extern const unsigned long ustotsmid[];
extern const unsigned long ustotshi[];
#define M_NEG(v_i, v_f) /* v = -v */ \
do { \
if ((v_f) == 0) \
(v_i) = -((s_fp)(v_i)); \
else { \
(v_f) = -((s_fp)(v_f)); \
(v_i) = ~(v_i); \
} \
} while(0)
#define L_NEG(v) M_NEG((v)->l_ui, (v)->l_uf)
#define TVUTOTSF(tvu, tsf) \
(tsf) = ustotslo[(tvu) & 0xff] \
+ ustotsmid[((tvu) >> 8) & 0xff] \
+ ustotshi[((tvu) >> 16) & 0xf]
#define sTVTOTS(tv, ts) \
do { \
int isneg = 0; \
long usec; \
(ts)->l_ui = (tv)->tv_sec; \
usec = (tv)->tv_usec; \
if (((tv)->tv_sec < 0) || ((tv)->tv_usec < 0)) { \
usec = -usec; \
(ts)->l_ui = -(ts)->l_ui; \
isneg = 1; \
} \
TVUTOTSF(usec, (ts)->l_uf); \
if (isneg) { \
L_NEG((ts)); \
} \
} while(0)
/* Taken from /usr/src/contrib/ntp/include/ntp_unixtime.h, FreeBSD 5.1-RELEASE */
/*
* TV_SHIFT is used to turn the table result into a usec value. To round,
* add in TV_ROUNDBIT before shifting
*/
#define TV_SHIFT 3
#define TV_ROUNDBIT 0x4
/*
* Convert a time stamp fraction to microseconds. The time stamp
* fraction is assumed to be unsigned. To use this in a program, declare:
*/
extern const long tstouslo[];
extern const long tstousmid[];
extern const long tstoushi[];
#define TSFTOTVU(tsf, tvu) \
(tvu) = (tstoushi[((tsf) >> 24) & 0xff] \
+ tstousmid[((tsf) >> 16) & 0xff] \
+ tstouslo[((tsf) >> 9) & 0x7f] \
+ TV_ROUNDBIT) >> TV_SHIFT
/*
* Convert a time stamp to a struct timeval. The time stamp
* has to be positive.
*/
#define TSTOTV(ts, tv) \
do { \
(tv)->tv_sec = (ts)->l_ui; \
TSFTOTVU((ts)->l_uf, (tv)->tv_usec); \
if ((tv)->tv_usec == 1000000) { \
(tv)->tv_sec++; \
(tv)->tv_usec = 0; \
} \
} while (0)
#endif /* _LIBPRELUDE_NTP_H */
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