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1 office 1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17  
18 /*
19 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GLib Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GLib at ftp://ftp.gtk.org/pub/gtk/.
23 */
24  
25 /*
26 * MT safe
27 */
28  
29 #include "config.h"
30 #include "glibconfig.h"
31  
32 #include <stdlib.h>
33  
34 #ifdef G_OS_UNIX
35 #include <unistd.h>
36 #endif /* G_OS_UNIX */
37  
38 #ifdef HAVE_SYS_TIME_H
39 #include <sys/time.h>
40 #endif
41 #include <time.h>
42 #ifndef G_OS_WIN32
43 #include <errno.h>
44 #endif /* G_OS_WIN32 */
45  
46 #ifdef G_OS_WIN32
47 #include <windows.h>
48 #endif /* G_OS_WIN32 */
49  
50 #include "gtimer.h"
51  
52 #include "gmem.h"
53 #include "gstrfuncs.h"
54 #include "gtestutils.h"
55 #include "gmain.h"
56  
57 /**
58 * SECTION:timers
59 * @title: Timers
60 * @short_description: keep track of elapsed time
61 *
62 * #GTimer records a start time, and counts microseconds elapsed since
63 * that time. This is done somewhat differently on different platforms,
64 * and can be tricky to get exactly right, so #GTimer provides a
65 * portable/convenient interface.
66 **/
67  
68 /**
69 * GTimer:
70 *
71 * Opaque datatype that records a start time.
72 **/
73 struct _GTimer
74 {
75 guint64 start;
76 guint64 end;
77  
78 guint active : 1;
79 };
80  
81 /**
82 * g_timer_new:
83 *
84 * Creates a new timer, and starts timing (i.e. g_timer_start() is
85 * implicitly called for you).
86 *
87 * Returns: a new #GTimer.
88 **/
89 GTimer*
90 g_timer_new (void)
91 {
92 GTimer *timer;
93  
94 timer = g_new (GTimer, 1);
95 timer->active = TRUE;
96  
97 timer->start = g_get_monotonic_time ();
98  
99 return timer;
100 }
101  
102 /**
103 * g_timer_destroy:
104 * @timer: a #GTimer to destroy.
105 *
106 * Destroys a timer, freeing associated resources.
107 **/
108 void
109 g_timer_destroy (GTimer *timer)
110 {
111 g_return_if_fail (timer != NULL);
112  
113 g_free (timer);
114 }
115  
116 /**
117 * g_timer_start:
118 * @timer: a #GTimer.
119 *
120 * Marks a start time, so that future calls to g_timer_elapsed() will
121 * report the time since g_timer_start() was called. g_timer_new()
122 * automatically marks the start time, so no need to call
123 * g_timer_start() immediately after creating the timer.
124 **/
125 void
126 g_timer_start (GTimer *timer)
127 {
128 g_return_if_fail (timer != NULL);
129  
130 timer->active = TRUE;
131  
132 timer->start = g_get_monotonic_time ();
133 }
134  
135 /**
136 * g_timer_stop:
137 * @timer: a #GTimer.
138 *
139 * Marks an end time, so calls to g_timer_elapsed() will return the
140 * difference between this end time and the start time.
141 **/
142 void
143 g_timer_stop (GTimer *timer)
144 {
145 g_return_if_fail (timer != NULL);
146  
147 timer->active = FALSE;
148  
149 timer->end = g_get_monotonic_time ();
150 }
151  
152 /**
153 * g_timer_reset:
154 * @timer: a #GTimer.
155 *
156 * This function is useless; it's fine to call g_timer_start() on an
157 * already-started timer to reset the start time, so g_timer_reset()
158 * serves no purpose.
159 **/
160 void
161 g_timer_reset (GTimer *timer)
162 {
163 g_return_if_fail (timer != NULL);
164  
165 timer->start = g_get_monotonic_time ();
166 }
167  
168 /**
169 * g_timer_continue:
170 * @timer: a #GTimer.
171 *
172 * Resumes a timer that has previously been stopped with
173 * g_timer_stop(). g_timer_stop() must be called before using this
174 * function.
175 *
176 * Since: 2.4
177 **/
178 void
179 g_timer_continue (GTimer *timer)
180 {
181 guint64 elapsed;
182  
183 g_return_if_fail (timer != NULL);
184 g_return_if_fail (timer->active == FALSE);
185  
186 /* Get elapsed time and reset timer start time
187 * to the current time minus the previously
188 * elapsed interval.
189 */
190  
191 elapsed = timer->end - timer->start;
192  
193 timer->start = g_get_monotonic_time ();
194  
195 timer->start -= elapsed;
196  
197 timer->active = TRUE;
198 }
199  
200 /**
201 * g_timer_elapsed:
202 * @timer: a #GTimer.
203 * @microseconds: return location for the fractional part of seconds
204 * elapsed, in microseconds (that is, the total number
205 * of microseconds elapsed, modulo 1000000), or %NULL
206 *
207 * If @timer has been started but not stopped, obtains the time since
208 * the timer was started. If @timer has been stopped, obtains the
209 * elapsed time between the time it was started and the time it was
210 * stopped. The return value is the number of seconds elapsed,
211 * including any fractional part. The @microseconds out parameter is
212 * essentially useless.
213 *
214 * Returns: seconds elapsed as a floating point value, including any
215 * fractional part.
216 **/
217 gdouble
218 g_timer_elapsed (GTimer *timer,
219 gulong *microseconds)
220 {
221 gdouble total;
222 gint64 elapsed;
223  
224 g_return_val_if_fail (timer != NULL, 0);
225  
226 if (timer->active)
227 timer->end = g_get_monotonic_time ();
228  
229 elapsed = timer->end - timer->start;
230  
231 total = elapsed / 1e6;
232  
233 if (microseconds)
234 *microseconds = elapsed % 1000000;
235  
236 return total;
237 }
238  
239 /**
240 * g_usleep:
241 * @microseconds: number of microseconds to pause
242 *
243 * Pauses the current thread for the given number of microseconds.
244 *
245 * There are 1 million microseconds per second (represented by the
246 * #G_USEC_PER_SEC macro). g_usleep() may have limited precision,
247 * depending on hardware and operating system; don't rely on the exact
248 * length of the sleep.
249 */
250 void
251 g_usleep (gulong microseconds)
252 {
253 #ifdef G_OS_WIN32
254 Sleep (microseconds / 1000);
255 #else
256 struct timespec request, remaining;
257 request.tv_sec = microseconds / G_USEC_PER_SEC;
258 request.tv_nsec = 1000 * (microseconds % G_USEC_PER_SEC);
259 while (nanosleep (&request, &remaining) == -1 && errno == EINTR)
260 request = remaining;
261 #endif
262 }
263  
264 /**
265 * g_time_val_add:
266 * @time_: a #GTimeVal
267 * @microseconds: number of microseconds to add to @time
268 *
269 * Adds the given number of microseconds to @time_. @microseconds can
270 * also be negative to decrease the value of @time_.
271 **/
272 void
273 g_time_val_add (GTimeVal *time_, glong microseconds)
274 {
275 g_return_if_fail (time_->tv_usec >= 0 && time_->tv_usec < G_USEC_PER_SEC);
276  
277 if (microseconds >= 0)
278 {
279 time_->tv_usec += microseconds % G_USEC_PER_SEC;
280 time_->tv_sec += microseconds / G_USEC_PER_SEC;
281 if (time_->tv_usec >= G_USEC_PER_SEC)
282 {
283 time_->tv_usec -= G_USEC_PER_SEC;
284 time_->tv_sec++;
285 }
286 }
287 else
288 {
289 microseconds *= -1;
290 time_->tv_usec -= microseconds % G_USEC_PER_SEC;
291 time_->tv_sec -= microseconds / G_USEC_PER_SEC;
292 if (time_->tv_usec < 0)
293 {
294 time_->tv_usec += G_USEC_PER_SEC;
295 time_->tv_sec--;
296 }
297 }
298 }
299  
300 /* converts a broken down date representation, relative to UTC,
301 * to a timestamp; it uses timegm() if it's available.
302 */
303 static time_t
304 mktime_utc (struct tm *tm)
305 {
306 time_t retval;
307  
308 #ifndef HAVE_TIMEGM
309 static const gint days_before[] =
310 {
311 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
312 };
313 #endif
314  
315 #ifndef HAVE_TIMEGM
316 if (tm->tm_mon < 0 || tm->tm_mon > 11)
317 return (time_t) -1;
318  
319 retval = (tm->tm_year - 70) * 365;
320 retval += (tm->tm_year - 68) / 4;
321 retval += days_before[tm->tm_mon] + tm->tm_mday - 1;
322  
323 if (tm->tm_year % 4 == 0 && tm->tm_mon < 2)
324 retval -= 1;
325  
326 retval = ((((retval * 24) + tm->tm_hour) * 60) + tm->tm_min) * 60 + tm->tm_sec;
327 #else
328 retval = timegm (tm);
329 #endif /* !HAVE_TIMEGM */
330  
331 return retval;
332 }
333  
334 /**
335 * g_time_val_from_iso8601:
336 * @iso_date: an ISO 8601 encoded date string
337 * @time_: (out): a #GTimeVal
338 *
339 * Converts a string containing an ISO 8601 encoded date and time
340 * to a #GTimeVal and puts it into @time_.
341 *
342 * @iso_date must include year, month, day, hours, minutes, and
343 * seconds. It can optionally include fractions of a second and a time
344 * zone indicator. (In the absence of any time zone indication, the
345 * timestamp is assumed to be in local time.)
346 *
347 * Returns: %TRUE if the conversion was successful.
348 *
349 * Since: 2.12
350 */
351 gboolean
352 g_time_val_from_iso8601 (const gchar *iso_date,
353 GTimeVal *time_)
354 {
355 struct tm tm = {0};
356 long val;
357  
358 g_return_val_if_fail (iso_date != NULL, FALSE);
359 g_return_val_if_fail (time_ != NULL, FALSE);
360  
361 /* Ensure that the first character is a digit, the first digit
362 * of the date, otherwise we don't have an ISO 8601 date
363 */
364 while (g_ascii_isspace (*iso_date))
365 iso_date++;
366  
367 if (*iso_date == '\0')
368 return FALSE;
369  
370 if (!g_ascii_isdigit (*iso_date) && *iso_date != '-' && *iso_date != '+')
371 return FALSE;
372  
373 val = strtoul (iso_date, (char **)&iso_date, 10);
374 if (*iso_date == '-')
375 {
376 /* YYYY-MM-DD */
377 tm.tm_year = val - 1900;
378 iso_date++;
379 tm.tm_mon = strtoul (iso_date, (char **)&iso_date, 10) - 1;
380  
381 if (*iso_date++ != '-')
382 return FALSE;
383  
384 tm.tm_mday = strtoul (iso_date, (char **)&iso_date, 10);
385 }
386 else
387 {
388 /* YYYYMMDD */
389 tm.tm_mday = val % 100;
390 tm.tm_mon = (val % 10000) / 100 - 1;
391 tm.tm_year = val / 10000 - 1900;
392 }
393  
394 if (*iso_date != 'T')
395 return FALSE;
396  
397 iso_date++;
398  
399 /* If there is a 'T' then there has to be a time */
400 if (!g_ascii_isdigit (*iso_date))
401 return FALSE;
402  
403 val = strtoul (iso_date, (char **)&iso_date, 10);
404 if (*iso_date == ':')
405 {
406 /* hh:mm:ss */
407 tm.tm_hour = val;
408 iso_date++;
409 tm.tm_min = strtoul (iso_date, (char **)&iso_date, 10);
410  
411 if (*iso_date++ != ':')
412 return FALSE;
413  
414 tm.tm_sec = strtoul (iso_date, (char **)&iso_date, 10);
415 }
416 else
417 {
418 /* hhmmss */
419 tm.tm_sec = val % 100;
420 tm.tm_min = (val % 10000) / 100;
421 tm.tm_hour = val / 10000;
422 }
423  
424 time_->tv_usec = 0;
425  
426 if (*iso_date == ',' || *iso_date == '.')
427 {
428 glong mul = 100000;
429  
430 while (g_ascii_isdigit (*++iso_date))
431 {
432 time_->tv_usec += (*iso_date - '0') * mul;
433 mul /= 10;
434 }
435 }
436  
437 /* Now parse the offset and convert tm to a time_t */
438 if (*iso_date == 'Z')
439 {
440 iso_date++;
441 time_->tv_sec = mktime_utc (&tm);
442 }
443 else if (*iso_date == '+' || *iso_date == '-')
444 {
445 gint sign = (*iso_date == '+') ? -1 : 1;
446  
447 val = strtoul (iso_date + 1, (char **)&iso_date, 10);
448  
449 if (*iso_date == ':')
450 val = 60 * val + strtoul (iso_date + 1, (char **)&iso_date, 10);
451 else
452 val = 60 * (val / 100) + (val % 100);
453  
454 time_->tv_sec = mktime_utc (&tm) + (time_t) (60 * val * sign);
455 }
456 else
457 {
458 /* No "Z" or offset, so local time */
459 tm.tm_isdst = -1; /* locale selects DST */
460 time_->tv_sec = mktime (&tm);
461 }
462  
463 while (g_ascii_isspace (*iso_date))
464 iso_date++;
465  
466 return *iso_date == '\0';
467 }
468  
469 /**
470 * g_time_val_to_iso8601:
471 * @time_: a #GTimeVal
472 *
473 * Converts @time_ into an RFC 3339 encoded string, relative to the
474 * Coordinated Universal Time (UTC). This is one of the many formats
475 * allowed by ISO 8601.
476 *
477 * ISO 8601 allows a large number of date/time formats, with or without
478 * punctuation and optional elements. The format returned by this function
479 * is a complete date and time, with optional punctuation included, the
480 * UTC time zone represented as "Z", and the @tv_usec part included if
481 * and only if it is nonzero, i.e. either
482 * "YYYY-MM-DDTHH:MM:SSZ" or "YYYY-MM-DDTHH:MM:SS.fffffZ".
483 *
484 * This corresponds to the Internet date/time format defined by
485 * [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt),
486 * and to either of the two most-precise formats defined by
487 * the W3C Note
488 * [Date and Time Formats](http://www.w3.org/TR/NOTE-datetime-19980827).
489 * Both of these documents are profiles of ISO 8601.
490 *
491 * Use g_date_time_format() or g_strdup_printf() if a different
492 * variation of ISO 8601 format is required.
493 *
494 * Returns: a newly allocated string containing an ISO 8601 date
495 *
496 * Since: 2.12
497 */
498 gchar *
499 g_time_val_to_iso8601 (GTimeVal *time_)
500 {
501 gchar *retval;
502 struct tm *tm;
503 #ifdef HAVE_GMTIME_R
504 struct tm tm_;
505 #endif
506 time_t secs;
507  
508 g_return_val_if_fail (time_->tv_usec >= 0 && time_->tv_usec < G_USEC_PER_SEC, NULL);
509  
510 secs = time_->tv_sec;
511 #ifdef _WIN32
512 tm = gmtime (&secs);
513 #else
514 #ifdef HAVE_GMTIME_R
515 tm = gmtime_r (&secs, &tm_);
516 #else
517 tm = gmtime (&secs);
518 #endif
519 #endif
520  
521 if (time_->tv_usec != 0)
522 {
523 /* ISO 8601 date and time format, with fractionary seconds:
524 * YYYY-MM-DDTHH:MM:SS.MMMMMMZ
525 */
526 retval = g_strdup_printf ("%4d-%02d-%02dT%02d:%02d:%02d.%06ldZ",
527 tm->tm_year + 1900,
528 tm->tm_mon + 1,
529 tm->tm_mday,
530 tm->tm_hour,
531 tm->tm_min,
532 tm->tm_sec,
533 time_->tv_usec);
534 }
535 else
536 {
537 /* ISO 8601 date and time format:
538 * YYYY-MM-DDTHH:MM:SSZ
539 */
540 retval = g_strdup_printf ("%4d-%02d-%02dT%02d:%02d:%02dZ",
541 tm->tm_year + 1900,
542 tm->tm_mon + 1,
543 tm->tm_mday,
544 tm->tm_hour,
545 tm->tm_min,
546 tm->tm_sec);
547 }
548  
549 return retval;
550 }