aboutsummaryrefslogtreecommitdiffstats
path: root/lib/psitime.cc
blob: 61a74fabd01147a0c753c9cda4647871a9aaf897 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
/*-*-c++-*-
 * $Id$
 *
 * This file is part of plptools.
 *
 *  Copyright (C) 2000-2002 Fritz Elfert <felfert@to.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include "psitime.h"
#include "plp_inttypes.h"

#include <stdlib.h>

#define OnePM 3600 // 13:00 offset for SIBO

using namespace std;

PsiTime::PsiTime(void) {
    ptzValid = false;
    tryPsiZone();
    setUnixNow();
}

PsiTime::PsiTime(time_t time) {
    ptzValid = false;
    gettimeofday(NULL, &utz);
    setUnixTime(time);
}

PsiTime::PsiTime(psi_timeval *_ptv, psi_timezone *_ptz) {
    if (_ptv != 0L)
	ptv = *_ptv;
    if (_ptz != 0L) {
	ptz = *_ptz;
	ptzValid = true;
    } else {
	ptzValid = false;
	tryPsiZone();
    }
    /* get our own timezone */
    gettimeofday(NULL, &utz);
    psi2unix();
}

PsiTime::PsiTime(const u_int32_t _ptvHi, const u_int32_t _ptvLo) {
    ptv.tv_high = _ptvHi;
    ptv.tv_low = _ptvLo;
    ptzValid = false;
    tryPsiZone();
    /* get our own timezone */
    gettimeofday(NULL, &utz);
    psi2unix();
}

PsiTime::PsiTime(struct timeval *_utv, struct timezone *_utz) {
    if (_utv != 0L)
	utv = *_utv;
    if (_utz != 0L)
	utz = *_utz;
    tryPsiZone();
    unix2psi();
}

PsiTime::PsiTime(const PsiTime &t) {
    utv = t.utv;
    utz = t.utz;
    ptv = t.ptv;
    ptz = t.ptz;
    ptzValid = t.ptzValid;
    tryPsiZone();
}

PsiTime::~PsiTime() {
    tryPsiZone();
}

void PsiTime::setUnixTime(struct timeval *_utv) {
    if (_utv != 0L)
	utv = *_utv;
    unix2psi();
}

void PsiTime::setUnixTime(time_t time) {
    utv.tv_sec = time;
    utv.tv_usec = 0;
    unix2psi();
}

void PsiTime::setUnixNow(void) {
    gettimeofday(&utv, &utz);
    unix2psi();
}


void PsiTime::setPsiTime(psi_timeval *_ptv) {
    if (_ptv != 0L)
	ptv = *_ptv;
    psi2unix();
}

void PsiTime::setPsiTime(const u_int32_t _ptvHi, const u_int32_t _ptvLo) {
    ptv.tv_high = _ptvHi;
    ptv.tv_low = _ptvLo;
    psi2unix();
}

void PsiTime::setPsiZone(psi_timezone *_ptz) {
    if (_ptz != 0L) {
	ptz = *_ptz;
	ptzValid = true;
    }
    psi2unix();
}

struct timeval &PsiTime::getTimeval(void) {
    return utv;
}

time_t PsiTime::getTime(void) {
    return utv.tv_sec;
}

psi_timeval &PsiTime::getPsiTimeval(void) {
    return ptv;
}

const u_int32_t PsiTime::getPsiTimeLo(void) {
    return ptv.tv_low;
}

const u_int32_t PsiTime::getPsiTimeHi(void) {
    return ptv.tv_high;
}

PsiTime &PsiTime::operator=(const PsiTime &t) {
    utv = t.utv;
    utz = t.utz;
    ptv = t.ptv;
    ptz = t.ptz;
    ptzValid = t.ptzValid;
    tryPsiZone();
    return *this;
}

bool PsiTime::operator==(const PsiTime &t) {
    psi2unix();
    return ((utv.tv_sec == t.utv.tv_sec) &&
	    (utv.tv_usec == t.utv.tv_usec));
}

bool PsiTime::operator<(const PsiTime &t) {
    psi2unix();
    if (utv.tv_sec == t.utv.tv_sec)
	return (utv.tv_usec < t.utv.tv_usec);
    else
	return (utv.tv_sec < t.utv.tv_sec);
}

bool PsiTime::operator>(const PsiTime &t) {
    psi2unix();
    if (utv.tv_sec == t.utv.tv_sec)
	return (utv.tv_usec > t.utv.tv_usec);
    else
	return (utv.tv_sec > t.utv.tv_sec);
}

ostream &operator<<(ostream &s, const PsiTime &t) {
    const char *fmt = "%c";
    char buf[100];
    strftime(buf, sizeof(buf), fmt, localtime(&t.utv.tv_sec));
    s << buf;
    return s;
}

/**
 * The difference between
 * EPOC epoch (01.01.0001 00:00:00)
 * and Unix epoch (01.01.1970 00:00:00)
 * in microseconds.
 */
#define EPOCH_DIFF 0x00dcddb30f2f8000ULL

static unsigned long long
evalOffset(psi_timezone ptz, time_t time, bool valid) {
    s_int64_t offset = 0;

    if (valid) {
	offset = ptz.utc_offset;
	if (!(ptz.dst_zones & 0x40000000) || (ptz.dst_zones & ptz.home_zone))
	    offset -= 3600;
    } else {
	/**
	* Fallback. If no Psion zone given, use
	* environment variable PSI_TZ
	*/
	const char *offstr = getenv("PSI_TZ");
	if (offstr != 0L) {
	    char *err = 0L;
	    offset = strtoul(offstr, &err, 0);
	    if (err != 0L && *err != '\0')
		offset = 0;
	} else {
	    /**
	    * Fallback. If PSI_TZ is not set,
	    * use the local timezone. This assumes,
	    * that both Psion and local machine are
	    * configured for the same timezone and
	    * daylight saving.
	    */
	    struct tm *tm = localtime(&time);
	    offset = timezone;
	    if (tm->tm_isdst)
		offset += 3600;
	}
    }
    // Substract out local timezone, it gets added
    // later
    time_t now = ::time(0);
    struct tm *now_tm = localtime(&now);
    offset -= timezone;

    offset *= 1000000;
    return offset;
}

void PsiTime::setSiboTime(u_int32_t stime) {
    unsigned long long micro = evalOffset(ptz, time(0), false);

    micro /= 1000000;
    utv.tv_sec = stime + OnePM - micro;
    utv.tv_usec = 0;
//    unix2psi();
}

u_int32_t PsiTime::getSiboTime(void) {
    unsigned long long micro = evalOffset(ptz, time(0), false);

    micro /= 1000000;
    return utv.tv_sec - OnePM + micro;
}

void PsiTime::psi2unix(void) {
    u_int64_t micro = ptv.tv_high;
    micro = (micro << 32) | ptv.tv_low;

    /* Substract Psion's idea of UTC offset */
    micro -= EPOCH_DIFF;
    micro -= evalOffset(ptz, micro / 1000000, ptzValid);

    utv.tv_sec = micro / 1000000;
    utv.tv_usec = micro % 1000000;
}

void PsiTime::unix2psi(void) {
    u_int64_t micro = (u_int64_t)utv.tv_sec * 1000000ULL + utv.tv_usec;

    /* Add Psion's idea of UTC offset */
    micro += evalOffset(ptz, utv.tv_sec, ptzValid);
    micro += EPOCH_DIFF;

    ptv.tv_low = micro & 0x0ffffffff;
    ptv.tv_high = (micro >> 32) & 0x0ffffffff;
}

void PsiTime::tryPsiZone() {
    if (ptzValid)
	return;
    if (PsiZone::getInstance().getZone(ptz))
	ptzValid = true;
}

PsiZone *PsiZone::_instance = 0L;

PsiZone &PsiZone::
getInstance() {
    if (_instance == 0L)
	_instance = new PsiZone();
    return *_instance;
}

PsiZone::PsiZone() {
    _ptzValid = false;
}

void PsiZone::
setZone(psi_timezone &ptz) {
    _ptz = ptz;
    _ptzValid = true;
}

bool PsiZone::
getZone(psi_timezone &ptz) {
    if (_ptzValid)
	ptz = _ptz;
    return _ptzValid;
}

/*
 * Local variables:
 * c-basic-offset: 4
 * End:
 */