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24 25
26
27
28 #ifdef HAVE_CONFIG_H
29 # include <config.h>
30 #endif
31
32 #ifdef _LIBC
33 # define HAVE_LIMITS_H 1
34 # define STDC_HEADERS 1
35 #endif
36
37 38 39
40 #ifndef LEAP_SECONDS_POSSIBLE
41 # define LEAP_SECONDS_POSSIBLE 1
42 #endif
43
44 #include <sys/types.h>
45 #include <time.h>
46
47 #if HAVE_LIMITS_H
48 # include <limits.h>
49 #endif
50
51 #if DEBUG
52 # include <stdio.h>
53 # if STDC_HEADERS
54 # include <stdlib.h>
55 # endif
56
57 # define mktime my_mktime
58 #endif
59
60 #ifndef __P
61 # if defined __GNUC__ || (defined __STDC__ && __STDC__)
62 # define __P(args) args
63 # else
64 # define __P(args) ()
65 # endif
66 #endif
67
68 #ifndef CHAR_BIT
69 # define CHAR_BIT 8
70 #endif
71
72
73 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
74 75
76 #define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
77 ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
78 #define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
79
80 #ifndef INT_MIN
81 # define INT_MIN TYPE_MINIMUM (int)
82 #endif
83 #ifndef INT_MAX
84 # define INT_MAX TYPE_MAXIMUM (int)
85 #endif
86
87 #ifndef TIME_T_MIN
88 # define TIME_T_MIN TYPE_MINIMUM (time_t)
89 #endif
90 #ifndef TIME_T_MAX
91 # define TIME_T_MAX TYPE_MAXIMUM (time_t)
92 #endif
93
94 #define TM_YEAR_BASE 1900
95 #define EPOCH_YEAR 1970
96
97 #ifndef __isleap
98 99
100 # define __isleap(year) \
101 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
102 #endif
103
104
105 const unsigned short int __mon_yday[2][13] =
106 {
107
108 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
109
110 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
111 };
112
113
114 #ifdef _LIBC
115 # define my_mktime_localtime_r __localtime_r
116 #else
117 118 119
120 static struct tm *
121 my_mktime_localtime_r (t, tp)
122 const time_t *t;
123 struct tm *tp;
124 {
125 struct tm *l = localtime (t);
126 if (! l)
127 return 0;
128 *tp = *l;
129 return tp;
130 }
131 #endif
132
133
134 135 136 137 138 139
140 static time_t
141 ydhms_tm_diff (year, yday, hour, min, sec, tp)
142 int year, yday, hour, min, sec;
143 const struct tm *tp;
144 {
145 if (!tp)
146 return 1;
147 else
148 {
149 150 151 152 153
154 int a4 = (year >> 2) + (TM_YEAR_BASE >> 2) - ! (year & 3);
155 int b4 = (tp->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (tp->tm_year & 3);
156 int a100 = a4 / 25 - (a4 % 25 < 0);
157 int b100 = b4 / 25 - (b4 % 25 < 0);
158 int a400 = a100 >> 2;
159 int b400 = b100 >> 2;
160 int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
161 time_t years = year - (time_t) tp->tm_year;
162 time_t days = (365 * years + intervening_leap_days
163 + (yday - tp->tm_yday));
164 return (60 * (60 * (24 * days + (hour - tp->tm_hour))
165 + (min - tp->tm_min))
166 + (sec - tp->tm_sec));
167 }
168 }
169
170 171 172
173 static struct tm *
174 ranged_convert (convert, t, tp)
175 #ifdef PROTOTYPES
176 struct tm *(*convert) (const time_t *, struct tm *);
177 #else
178 struct tm *(*convert)();
179 #endif
180 time_t *t;
181 struct tm *tp;
182 {
183 struct tm *r;
184
185 if (! (r = (*convert) (t, tp)) && *t)
186 {
187 time_t bad = *t;
188 time_t ok = 0;
189 struct tm tm;
190
191 192 193
194 while (bad != ok + (bad < 0 ? -1 : 1))
195 {
196 time_t mid = *t = (bad < 0
197 ? bad + ((ok - bad) >> 1)
198 : ok + ((bad - ok) >> 1));
199 if ((r = (*convert) (t, tp)))
200 {
201 tm = *r;
202 ok = mid;
203 }
204 else
205 bad = mid;
206 }
207
208 if (!r && ok)
209 {
210 211
212 *t = ok;
213 *tp = tm;
214 r = tp;
215 }
216 }
217
218 return r;
219 }
220
221
222 223 224 225 226
227 time_t
228 __mktime_internal (tp, convert, offset)
229 struct tm *tp;
230 #ifdef PROTOTYPES
231 struct tm *(*convert) (const time_t *, struct tm *);
232 #else
233 struct tm *(*convert)();
234 #endif
235 time_t *offset;
236 {
237 time_t t, dt, t0, t1, t2;
238 struct tm tm;
239
240 241 242 243
244 int remaining_probes = 6;
245
246 247
248 int sec = tp->tm_sec;
249 int min = tp->tm_min;
250 int hour = tp->tm_hour;
251 int mday = tp->tm_mday;
252 int mon = tp->tm_mon;
253 int year_requested = tp->tm_year;
254 int isdst = tp->tm_isdst;
255
256
257 int dst2;
258
259
260 int mon_remainder = mon % 12;
261 int negative_mon_remainder = mon_remainder < 0;
262 int mon_years = mon / 12 - negative_mon_remainder;
263 int year = year_requested + mon_years;
264
265 266 267 268
269
270 271
272 int yday = ((__mon_yday[__isleap (year + TM_YEAR_BASE)]
273 [mon_remainder + 12 * negative_mon_remainder])
274 + mday - 1);
275
276 int sec_requested = sec;
277
278 279 280
281 if (year < 69)
282 return -1;
283
284 #if LEAP_SECONDS_POSSIBLE
285 286
287 if (sec < 0)
288 sec = 0;
289 if (59 < sec)
290 sec = 59;
291 #endif
292
293 294
295
296 tm.tm_year = EPOCH_YEAR - TM_YEAR_BASE;
297 tm.tm_yday = tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
298 t0 = ydhms_tm_diff (year, yday, hour, min, sec, &tm);
299
300 for (t = t1 = t2 = t0 + *offset, dst2 = 0;
301 (dt = ydhms_tm_diff (year, yday, hour, min, sec,
302 ranged_convert (convert, &t, &tm)));
303 t1 = t2, t2 = t, t += dt, dst2 = tm.tm_isdst != 0)
304 if (t == t1 && t != t2
305 && (tm.tm_isdst < 0
306 || (isdst < 0
307 ? dst2 <= (tm.tm_isdst != 0)
308 : (isdst != 0) != (tm.tm_isdst != 0))))
309 310 311 312 313 314 315 316 317
318 break;
319 else if (--remaining_probes == 0)
320 return -1;
321
322 323
324 if (dt == 0 && isdst != tm.tm_isdst && 0 <= isdst && 0 <= tm.tm_isdst)
325 {
326 327 328 329 330
331 int quarter = 7889238;
332 int i;
333
334
335 if (t < TIME_T_MIN + 3 * quarter)
336 quarter = -quarter;
337
338 for (i = 1; i <= 3; i++)
339 {
340 time_t ot = t - i * quarter;
341 struct tm otm;
342 ranged_convert (convert, &ot, &otm);
343 if (otm.tm_isdst == isdst)
344 {
345 346
347 t = ot + ydhms_tm_diff (year, yday, hour, min, sec, &otm);
348 ranged_convert (convert, &t, &tm);
349 break;
350 }
351 }
352 }
353
354 *offset = t - t0;
355
356 #if LEAP_SECONDS_POSSIBLE
357 if (sec_requested != tm.tm_sec)
358 {
359 360
361 t += sec_requested - sec + (sec == 0 && tm.tm_sec == 60);
362 if (! (*convert) (&t, &tm))
363 return -1;
364 }
365 #endif
366
367 if (TIME_T_MAX / INT_MAX / 366 / 24 / 60 / 60 < 3)
368 {
369 370 371 372 373
374
375 double dyear = (double) year_requested + mon_years - tm.tm_year;
376 double dday = 366 * dyear + mday;
377 double dsec = 60 * (60 * (24 * dday + hour) + min) + sec_requested;
378
379 380 381 382
383
384 const time_t time_t_max = TIME_T_MAX;
385 const time_t time_t_min = TIME_T_MIN;
386
387 if (time_t_max / 3 - time_t_min / 3 < (dsec < 0 ? - dsec : dsec))
388 return -1;
389 }
390
391 if (year == 69)
392 {
393 394
395 if (t < 0 || t > 2 * 24 * 60 * 60)
396 return -1;
397 }
398
399 *tp = tm;
400 return t;
401 }
402
403
404 static time_t localtime_offset;
405
406
407 time_t
408 mktime (tp)
409 struct tm *tp;
410 {
411 #ifdef _LIBC
412 413 414
415 __tzset ();
416 #endif
417
418 return __mktime_internal (tp, my_mktime_localtime_r, &localtime_offset);
419 }
420
421 #ifdef weak_alias
422 weak_alias (mktime, timelocal)
423 #endif
424
425 #if DEBUG
426
427 static int
428 not_equal_tm (a, b)
429 struct tm *a;
430 struct tm *b;
431 {
432 return ((a->tm_sec ^ b->tm_sec)
433 | (a->tm_min ^ b->tm_min)
434 | (a->tm_hour ^ b->tm_hour)
435 | (a->tm_mday ^ b->tm_mday)
436 | (a->tm_mon ^ b->tm_mon)
437 | (a->tm_year ^ b->tm_year)
438 | (a->tm_mday ^ b->tm_mday)
439 | (a->tm_yday ^ b->tm_yday)
440 | (a->tm_isdst ^ b->tm_isdst));
441 }
442
443 static void
444 print_tm (tp)
445 struct tm *tp;
446 {
447 if (tp)
448 printf ("%04d-%02d-%02d %02d:%02d:%02d yday %03d wday %d isdst %d",
449 tp->tm_year + TM_YEAR_BASE, tp->tm_mon + 1, tp->tm_mday,
450 tp->tm_hour, tp->tm_min, tp->tm_sec,
451 tp->tm_yday, tp->tm_wday, tp->tm_isdst);
452 else
453 printf ("0");
454 }
455
456 static int
457 check_result (tk, tmk, tl, lt)
458 time_t tk;
459 struct tm tmk;
460 time_t tl;
461 struct tm *lt;
462 {
463 if (tk != tl || !lt || not_equal_tm (&tmk, lt))
464 {
465 printf ("mktime (");
466 print_tm (&tmk);
467 printf (")\nyields (");
468 print_tm (lt);
469 printf (") == %ld, should be %ld\n", (long) tl, (long) tk);
470 return 1;
471 }
472
473 return 0;
474 }
475
476 int
477 main (argc, argv)
478 int argc;
479 char **argv;
480 {
481 int status = 0;
482 struct tm tm, tmk, tml;
483 struct tm *lt;
484 time_t tk, tl;
485 char trailer;
486
487 if ((argc == 3 || argc == 4)
488 && (sscanf (argv[1], "%d-%d-%d%c",
489 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &trailer)
490 == 3)
491 && (sscanf (argv[2], "%d:%d:%d%c",
492 &tm.tm_hour, &tm.tm_min, &tm.tm_sec, &trailer)
493 == 3))
494 {
495 tm.tm_year -= TM_YEAR_BASE;
496 tm.tm_mon--;
497 tm.tm_isdst = argc == 3 ? -1 : atoi (argv[3]);
498 tmk = tm;
499 tl = mktime (&tmk);
500 lt = localtime (&tl);
501 if (lt)
502 {
503 tml = *lt;
504 lt = &tml;
505 }
506 printf ("mktime returns %ld == ", (long) tl);
507 print_tm (&tmk);
508 printf ("\n");
509 status = check_result (tl, tmk, tl, lt);
510 }
511 else if (argc == 4 || (argc == 5 && strcmp (argv[4], "-") == 0))
512 {
513 time_t from = atol (argv[1]);
514 time_t by = atol (argv[2]);
515 time_t to = atol (argv[3]);
516
517 if (argc == 4)
518 for (tl = from; tl <= to; tl += by)
519 {
520 lt = localtime (&tl);
521 if (lt)
522 {
523 tmk = tml = *lt;
524 tk = mktime (&tmk);
525 status |= check_result (tk, tmk, tl, tml);
526 }
527 else
528 {
529 printf ("localtime (%ld) yields 0\n", (long) tl);
530 status = 1;
531 }
532 }
533 else
534 for (tl = from; tl <= to; tl += by)
535 {
536
537 lt = localtime (&tl);
538 if (lt)
539 {
540 tmk = tml = *lt;
541 tk = tl;
542 status |= check_result (tk, tmk, tl, tml);
543 }
544 else
545 {
546 printf ("localtime (%ld) yields 0\n", (long) tl);
547 status = 1;
548 }
549 }
550 }
551 else
552 printf ("Usage:\
553 \t%s YYYY-MM-DD HH:MM:SS [ISDST] # Test given time.\n\
554 \t%s FROM BY TO # Test values FROM, FROM+BY, ..., TO.\n\
555 \t%s FROM BY TO - # Do not test those values (for benchmark).\n",
556 argv[0], argv[0], argv[0]);
557
558 return status;
559 }
560
561 #endif
562
563 564 565 566 567
568
569 570