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mktime.c

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1 /* Convert a 'struct tm' to a time_t value. -

3 This file is part of the GNU C Library. -

4 Contributed by Paul Eggert <eggert@twinsun.com>. -

5 -

6 The GNU C Library is free software; you can redistribute it and/or -

7 modify it under the terms of the GNU General Public -

8 License as published by the Free Software Foundation; either -

9 version 3 of the License, or (at your option) any later version. -

10 -

11 The GNU C Library is distributed in the hope that it will be useful, -

12 but WITHOUT ANY WARRANTY; without even the implied warranty of -

13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -

14 General Public License for more details. -

15 -

16 You should have received a copy of the GNU General Public -

17 License along with the GNU C Library; if not, see -

18 <https://www.gnu.org/licenses/>. */ -

19 -

20 /* Define this to 1 to have a standalone program to test this implementation of -

21 mktime. */ -

22 #ifndef DEBUG_MKTIME -

23 # define DEBUG_MKTIME 0 -

24 #endif -

25 -

26 /* The following macros influence what gets defined when this file is compiled: -

27 -

28 Macro/expression Which gnulib module This compilation unit -

29 should define -

30 -

31 NEED_MKTIME_WORKING mktime rpl_mktime -

32 || NEED_MKTIME_WINDOWS -

33 -

34 NEED_MKTIME_INTERNAL mktime-internal mktime_internal -

35 -

36 DEBUG_MKTIME (defined manually) my_mktime, main -

37 */ -

38 -

39 #if !defined _LIBC && !DEBUG_MKTIME -

40 # include <config.h> -

41 #endif -

42 -

43 /* Assume that leap seconds are possible, unless told otherwise. -

44 If the host has a 'zic' command with a '-L leapsecondfilename' option, -

45 then it supports leap seconds; otherwise it probably doesn't. */ -

46 #ifndef LEAP_SECONDS_POSSIBLE -

47 # define LEAP_SECONDS_POSSIBLE 1 -

48 #endif -

49 -

50 #include <time.h> -

51 -

52 #include <limits.h> -

53 #include <stdbool.h> -

54 -

55 #include <intprops.h> -

56 #include <verify.h> -

57 -

58 #if DEBUG_MKTIME -

59 # include <stdio.h> -

60 # include <stdlib.h> -

61 # include <string.h> -

62 /* Make it work even if the system's libc has its own mktime routine. */ -

63 # undef mktime -

64 # define mktime my_mktime -

65 #endif -

66 -

67 #if NEED_MKTIME_WINDOWS /* on native Windows */ -

68 # include <stdlib.h> -

69 # include <string.h> -

70 #endif -

71 -

72 #if NEED_MKTIME_WORKING || NEED_MKTIME_INTERNAL || DEBUG_MKTIME -

73 -

74 /* A signed type that can represent an integer number of years -

75 multiplied by three times the number of seconds in a year. It is -

76 needed when converting a tm_year value times the number of seconds -

77 in a year. The factor of three comes because these products need -

78 to be subtracted from each other, and sometimes with an offset -

79 added to them, without worrying about overflow. -

80 -

81 Much of the code uses long_int to represent time_t values, to -

82 lessen the hassle of dealing with platforms where time_t is -

83 unsigned, and because long_int should suffice to represent all -

84 time_t values that mktime can generate even on platforms where -

85 time_t is excessively wide. */ -

86 -

87 #if INT_MAX <= LONG_MAX / 3 / 366 / 24 / 60 / 60 -

88 typedef long int long_int; -

89 #else -

90 typedef long long int long_int; -

91 #endif -

92 verify (INT_MAX <= TYPE_MAXIMUM (long_int) / 3 / 366 / 24 / 60 / 60); -

93 -

94 /* Shift A right by B bits portably, by dividing A by 2**B and -

95 truncating towards minus infinity. B should be in the range 0 <= B -

96 <= LONG_INT_BITS - 2, where LONG_INT_BITS is the number of useful -

97 bits in a long_int. LONG_INT_BITS is at least 32. -

98 -

99 ISO C99 says that A >> B is implementation-defined if A < 0. Some -

100 implementations (e.g., UNICOS 9.0 on a Cray Y-MP EL) don't shift -

101 right in the usual way when A < 0, so SHR falls back on division if -

102 ordinary A >> B doesn't seem to be the usual signed shift. */ -

103 -

104 static long_int -

105 shr (long_int a, int b) -

106 { -

107 long_int one = 1; -

108

return (-one >> 1 == -1

never executed: return (-one >> 1 == -1 ? a >> b : a / (one << b) - (a % (one << b) < 0));

109

? a >> b

never executed: return (-one >> 1 == -1 ? a >> b : a / (one << b) - (a % (one << b) < 0));

110

: a / (one << b) - (a % (one << b) < 0));

never executed: return (-one >> 1 == -1 ? a >> b : a / (one << b) - (a % (one << b) < 0));

111 } -

112 -

113 /* Bounds for the intersection of time_t and long_int. */ -

114 -

115 static long_int const mktime_min -

116 = ((TYPE_SIGNED (time_t) && TYPE_MINIMUM (time_t) < TYPE_MINIMUM (long_int)) -

117 ? TYPE_MINIMUM (long_int) : TYPE_MINIMUM (time_t)); -

118 static long_int const mktime_max -

119 = (TYPE_MAXIMUM (long_int) < TYPE_MAXIMUM (time_t) -

120 ? TYPE_MAXIMUM (long_int) : TYPE_MAXIMUM (time_t)); -

121 -

122 verify (TYPE_IS_INTEGER (time_t)); -

123 -

124 #define EPOCH_YEAR 1970 -

125 #define TM_YEAR_BASE 1900 -

126 verify (TM_YEAR_BASE % 100 == 0); -

127 -

128 /* Is YEAR + TM_YEAR_BASE a leap year? */ -

129 static bool -

130 leapyear (long_int year) -

131 { -

132 /* Don't add YEAR to TM_YEAR_BASE, as that might overflow. -

133 Also, work even if YEAR is negative. */ -

134

return

never executed: return ((year & 3) == 0 && (year % 100 != 0 || ((year / 100) & 3) == (- (1900 / 100) & 3)));

135

((year & 3) == 0

never executed: return ((year & 3) == 0 && (year % 100 != 0 || ((year / 100) & 3) == (- (1900 / 100) & 3)));

136

&& (year % 100 != 0

never executed: return ((year & 3) == 0 && (year % 100 != 0 || ((year / 100) & 3) == (- (1900 / 100) & 3)));

137

|| ((year / 100) & 3) == (- (TM_YEAR_BASE / 100) & 3)));

never executed: return ((year & 3) == 0 && (year % 100 != 0 || ((year / 100) & 3) == (- (1900 / 100) & 3)));

138 } -

139 -

140 /* How many days come before each month (0-12). */ -

141 #ifndef _LIBC -

142 static -

143 #endif -

144 const unsigned short int __mon_yday[2][13] = -

145 { -

146 /* Normal years. */ -

147 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, -

148 /* Leap years. */ -

149 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } -

150 }; -

151 -

152 -

153 #ifdef _LIBC -

154 typedef time_t mktime_offset_t; -

155 #else -

156 /* Portable standalone applications should supply a <time.h> that -

157 declares a POSIX-compliant localtime_r, for the benefit of older -

158 implementations that lack localtime_r or have a nonstandard one. -

159 See the gnulib time_r module for one way to implement this. */ -

160 # undef __localtime_r -

161 # define __localtime_r localtime_r -

162 # define __mktime_internal mktime_internal -

163 # include "mktime-internal.h" -

164 #endif -

165 -

166 /* Do the values A and B differ according to the rules for tm_isdst? -

167 A and B differ if one is zero and the other positive. */ -

168 static bool -

169 isdst_differ (int a, int b) -

170 { -

171

return (!a != !b) && (0 <= a) && (0 <= b);

never executed: return (!a != !b) && (0 <= a) && (0 <= b);

172 } -

173 -

174 /* Return an integer value measuring (YEAR1-YDAY1 HOUR1:MIN1:SEC1) - -

175 (YEAR0-YDAY0 HOUR0:MIN0:SEC0) in seconds, assuming that the clocks -

176 were not adjusted between the timestamps. -

177 -

178 The YEAR values uses the same numbering as TP->tm_year. Values -

179 need not be in the usual range. However, YEAR1 must not overflow -

180 when multiplied by three times the number of seconds in a year, and -

181 likewise for YDAY1 and three times the number of seconds in a day. */ -

182 -

183 static long_int -

184 ydhms_diff (long_int year1, long_int yday1, int hour1, int min1, int sec1, -

185 int year0, int yday0, int hour0, int min0, int sec0) -

186 { -

187 verify (-1 / 2 == 0); -

188 -

189 /* Compute intervening leap days correctly even if year is negative. -

190 Take care to avoid integer overflow here. */ -

191 int a4 = shr (year1, 2) + shr (TM_YEAR_BASE, 2) - ! (year1 & 3); -

192 int b4 = shr (year0, 2) + shr (TM_YEAR_BASE, 2) - ! (year0 & 3); -

193 int a100 = a4 / 25 - (a4 % 25 < 0); -

194 int b100 = b4 / 25 - (b4 % 25 < 0); -

195 int a400 = shr (a100, 2); -

196 int b400 = shr (b100, 2); -

197 int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400); -

198 -

199 /* Compute the desired time without overflowing. */ -

200 long_int years = year1 - year0; -

201 long_int days = 365 * years + yday1 - yday0 + intervening_leap_days; -

202 long_int hours = 24 * days + hour1 - hour0; -

203 long_int minutes = 60 * hours + min1 - min0; -

204 long_int seconds = 60 * minutes + sec1 - sec0; -

205

return seconds;

never executed: return seconds;

206 } -

207 -

208 /* Return the average of A and B, even if A + B would overflow. -

209 Round toward positive infinity. */ -

210 static long_int -

211 long_int_avg (long_int a, long_int b) -

212 { -

213

return shr (a, 1) + shr (b, 1) + ((a | b) & 1);

never executed: return shr (a, 1) + shr (b, 1) + ((a | b) & 1);

214 } -

215 -

216 /* Return a time_t value corresponding to (YEAR-YDAY HOUR:MIN:SEC), -

217 assuming that T corresponds to *TP and that no clock adjustments -

218 occurred between *TP and the desired time. -

219 Although T and the returned value are of type long_int, -

220 they represent time_t values and must be in time_t range. -

221 If TP is null, return a value not equal to T; this avoids false matches. -

222 YEAR and YDAY must not be so large that multiplying them by three times the -

223 number of seconds in a year (or day, respectively) would overflow long_int. -

224 If the returned value would be out of range, yield the minimal or -

225 maximal in-range value, except do not yield a value equal to T. */ -

226 static long_int -

227 guess_time_tm (long_int year, long_int yday, int hour, int min, int sec, -

228 long_int t, const struct tm *tp) -

229 { -

230

if (tp)

tp	Description
TRUE	never evaluated
FALSE	never evaluated

231 { -

232 long_int result; -

233 long_int d = ydhms_diff (year, yday, hour, min, sec, -

234 tp->tm_year, tp->tm_yday, -

235 tp->tm_hour, tp->tm_min, tp->tm_sec); -

236

if (! INT_ADD_WRAPV (t, d, &result))

! __builtin_ad...t, d, &result)	Description
TRUE	never evaluated
FALSE	never evaluated

237

return result;

never executed: return result;

238

}

never executed: end of block

239 -

240 /* Overflow occurred one way or another. Return the nearest result -

241 that is actually in range, except don't report a zero difference -

242 if the actual difference is nonzero, as that would cause a false -

243 match; and don't oscillate between two values, as that would -

244 confuse the spring-forward gap detector. */ -

245

return (t < long_int_avg (mktime_min, mktime_max)

never executed:

return (t < long_int_avg (mktime_min, mktime_max) ? (t <= mktime_min + 1 ? t + 1 : mktime_min) : (mktime_max - 1 <= t ? t - 1 : mktime_max));

246

? (t <= mktime_min + 1 ? t + 1 : mktime_min)

never executed:

return (t < long_int_avg (mktime_min, mktime_max) ? (t <= mktime_min + 1 ? t + 1 : mktime_min) : (mktime_max - 1 <= t ? t - 1 : mktime_max));

247

: (mktime_max - 1 <= t ? t - 1 : mktime_max));

never executed:

return (t < long_int_avg (mktime_min, mktime_max) ? (t <= mktime_min + 1 ? t + 1 : mktime_min) : (mktime_max - 1 <= t ? t - 1 : mktime_max));

248 } -

249 -

250 /* Use CONVERT to convert T to a struct tm value in *TM. T must be in -

251 range for time_t. Return TM if successful, NULL if T is out of -

252 range for CONVERT. */ -

253 static struct tm * -

254 convert_time (struct tm *(*convert) (const time_t *, struct tm *), -

255 long_int t, struct tm *tm) -

256 { -

257 time_t x = t; -

258

return convert (&x, tm);

never executed: return convert (&x, tm);

259 } -

260 -

261 /* Use CONVERT to convert *T to a broken down time in *TP. -

262 If *T is out of range for conversion, adjust it so that -

263 it is the nearest in-range value and then convert that. -

264 A value is in range if it fits in both time_t and long_int. */ -

265 static struct tm * -

266 ranged_convert (struct tm *(*convert) (const time_t *, struct tm *), -

267 long_int *t, struct tm *tp) -

268 { -

269 struct tm *r; -

270

if (*t < mktime_min)

*t < mktime_min	Description
TRUE	never evaluated
FALSE	never evaluated

271

*t = mktime_min;

never executed: *t = mktime_min;

272

else if (mktime_max < *t)

mktime_max < *t	Description
TRUE	never evaluated
FALSE	never evaluated

273

*t = mktime_max;

never executed: *t = mktime_max;

274 r = convert_time (convert, *t, tp); -

275 -

276

if (!r && *t)

!r	Description
TRUE	never evaluated
FALSE	never evaluated

*t	Description
TRUE	never evaluated
FALSE	never evaluated

277 { -

278 long_int bad = *t; -

279 long_int ok = 0; -

280 -

281 /* BAD is a known unconvertible value, and OK is a known good one. -

282 Use binary search to narrow the range between BAD and OK until -

283 they differ by 1. */ -

284 while (true) -

285 { -

286 long_int mid = long_int_avg (ok, bad); -

287

if (mid != ok && mid != bad)

mid != ok	Description
TRUE	never evaluated
FALSE	never evaluated

mid != bad	Description
TRUE	never evaluated
FALSE	never evaluated

288

break;

never executed: break;

289 r = convert_time (convert, mid, tp); -

290

if (r)

r	Description
TRUE	never evaluated
FALSE	never evaluated

291

ok = mid;

never executed: ok = mid;

292 else -

293

bad = mid;

never executed: bad = mid;

294 } -

295 -

296

if (!r && ok)

!r	Description
TRUE	never evaluated
FALSE	never evaluated

ok	Description
TRUE	never evaluated
FALSE	never evaluated

297 { -

298 /* The last conversion attempt failed; -

299 revert to the most recent successful attempt. */ -

300 r = convert_time (convert, ok, tp); -

301

}

never executed: end of block

302

}

never executed: end of block

303 -

304

return r;

never executed: return r;

305 } -

306 -

307 /* Convert *TP to a time_t value, inverting -

308 the monotonic and mostly-unit-linear conversion function CONVERT. -

309 Use *OFFSET to keep track of a guess at the offset of the result, -

310 compared to what the result would be for UTC without leap seconds. -

311 If *OFFSET's guess is correct, only one CONVERT call is needed. -

312 This function is external because it is used also by timegm.c. */ -

313 time_t -

314 __mktime_internal (struct tm *tp, -

315 struct tm *(*convert) (const time_t *, struct tm *), -

316 mktime_offset_t *offset) -

317 { -

318 long_int t, gt, t0, t1, t2, dt; -

319 struct tm tm; -

320 -

321 /* The maximum number of probes (calls to CONVERT) should be enough -

322 to handle any combinations of time zone rule changes, solar time, -

323 leap seconds, and oscillations around a spring-forward gap. -

324 POSIX.1 prohibits leap seconds, but some hosts have them anyway. */ -

325 int remaining_probes = 6; -

326 -

327 /* Time requested. Copy it in case CONVERT modifies *TP; this can -

328 occur if TP is localtime's returned value and CONVERT is localtime. */ -

329 int sec = tp->tm_sec; -

330 int min = tp->tm_min; -

331 int hour = tp->tm_hour; -

332 int mday = tp->tm_mday; -

333 int mon = tp->tm_mon; -

334 int year_requested = tp->tm_year; -

335 int isdst = tp->tm_isdst; -

336 -

337 /* 1 if the previous probe was DST. */ -

338 int dst2; -

339 -

340 /* Ensure that mon is in range, and set year accordingly. */ -

341 int mon_remainder = mon % 12; -

342 int negative_mon_remainder = mon_remainder < 0; -

343 int mon_years = mon / 12 - negative_mon_remainder; -

344 long_int lyear_requested = year_requested; -

345 long_int year = lyear_requested + mon_years; -

346 -

347 /* The other values need not be in range: -

348 the remaining code handles overflows correctly. */ -

349 -

350 /* Calculate day of year from year, month, and day of month. -

351 The result need not be in range. */ -

352 int mon_yday = ((__mon_yday[leapyear (year)] -

353 [mon_remainder + 12 * negative_mon_remainder]) -

354 - 1); -

355 long_int lmday = mday; -

356 long_int yday = mon_yday + lmday; -

357 -

358 int negative_offset_guess; -

359 -

360 int sec_requested = sec; -

361 -

362 if (LEAP_SECONDS_POSSIBLE) -

363 { -

364 /* Handle out-of-range seconds specially, -

365 since ydhms_tm_diff assumes every minute has 60 seconds. */ -

366

if (sec < 0)

sec < 0	Description
TRUE	never evaluated
FALSE	never evaluated

367

sec = 0;

never executed: sec = 0;

368

if (59 < sec)

59 < sec	Description
TRUE	never evaluated
FALSE	never evaluated

369

sec = 59;

never executed: sec = 59;

370

}

never executed: end of block

371 -

372 /* Invert CONVERT by probing. First assume the same offset as last -

373 time. */ -

374 -

375 INT_SUBTRACT_WRAPV (0, *offset, &negative_offset_guess); -

376 t0 = ydhms_diff (year, yday, hour, min, sec, -

377 EPOCH_YEAR - TM_YEAR_BASE, 0, 0, 0, negative_offset_guess); -

378 -

379 /* Repeatedly use the error to improve the guess. */ -

380 -

381 for (t = t1 = t2 = t0, dst2 = 0; -

382

(gt = guess_time_tm (year, yday, hour, min, sec, t,

(gt = guess_ti...tm)), t != gt)	Description
TRUE	never evaluated
FALSE	never evaluated

383

ranged_convert (convert, &t, &tm)),

(gt = guess_ti...tm)), t != gt)	Description
TRUE	never evaluated
FALSE	never evaluated

384

t != gt);

(gt = guess_ti...tm)), t != gt)	Description
TRUE	never evaluated
FALSE	never evaluated

385 t1 = t2, t2 = t, t = gt, dst2 = tm.tm_isdst != 0) -

386

if (t == t1 && t != t2

t == t1	Description
TRUE	never evaluated
FALSE	never evaluated

t != t2	Description
TRUE	never evaluated
FALSE	never evaluated

387

&& (tm.tm_isdst < 0

tm.tm_isdst < 0	Description
TRUE	never evaluated
FALSE	never evaluated

388

|| (isdst < 0

isdst < 0	Description
TRUE	never evaluated
FALSE	never evaluated

(isdst < 0 ? d...m_isdst != 0))	Description
TRUE	never evaluated
FALSE	never evaluated

389

? dst2 <= (tm.tm_isdst != 0)

(isdst < 0 ? d...m_isdst != 0))	Description
TRUE	never evaluated
FALSE	never evaluated

390

: (isdst != 0) != (tm.tm_isdst != 0))))

(isdst < 0 ? d...m_isdst != 0))	Description
TRUE	never evaluated
FALSE	never evaluated

391 /* We can't possibly find a match, as we are oscillating -

392 between two values. The requested time probably falls -

393 within a spring-forward gap of size GT - T. Follow the common -

394 practice in this case, which is to return a time that is GT - T -

395 away from the requested time, preferring a time whose -

396 tm_isdst differs from the requested value. (If no tm_isdst -

397 was requested and only one of the two values has a nonzero -

398 tm_isdst, prefer that value.) In practice, this is more -

399 useful than returning -1. */ -

400

goto offset_found;

never executed: goto offset_found;

401

else if (--remaining_probes == 0)

--remaining_probes == 0	Description
TRUE	never evaluated
FALSE	never evaluated

402

return -1;

never executed: return -1;

403 -

404 /* We have a match. Check whether tm.tm_isdst has the requested -

405 value, if any. */ -

406

if (isdst_differ (isdst, tm.tm_isdst))

isdst_differ (..., tm.tm_isdst)	Description
TRUE	never evaluated
FALSE	never evaluated

407 { -

408 /* tm.tm_isdst has the wrong value. Look for a neighboring -

409 time with the right value, and use its UTC offset. -

410 -

411 Heuristic: probe the adjacent timestamps in both directions, -

412 looking for the desired isdst. This should work for all real -

413 time zone histories in the tz database. */ -

414 -

415 /* Distance between probes when looking for a DST boundary. In -

416 tzdata2003a, the shortest period of DST is 601200 seconds -

417 (e.g., America/Recife starting 2000-10-08 01:00), and the -

418 shortest period of non-DST surrounded by DST is 694800 -

419 seconds (Africa/Tunis starting 1943-04-17 01:00). Use the -

420 minimum of these two values, so we don't miss these short -

421 periods when probing. */ -

422 int stride = 601200; -

423 -

424 /* The longest period of DST in tzdata2003a is 536454000 seconds -

425 (e.g., America/Jujuy starting 1946-10-01 01:00). The longest -

426 period of non-DST is much longer, but it makes no real sense -

427 to search for more than a year of non-DST, so use the DST -

428 max. */ -

429 int duration_max = 536454000; -

430 -

431 /* Search in both directions, so the maximum distance is half -

432 the duration; add the stride to avoid off-by-1 problems. */ -

433 int delta_bound = duration_max / 2 + stride; -

434 -

435 int delta, direction; -

436 -

437

for (delta = stride; delta < delta_bound; delta += stride)

delta < delta_bound	Description
TRUE	never evaluated
FALSE	never evaluated

438

for (direction = -1; direction <= 1; direction += 2)

direction <= 1	Description
TRUE	never evaluated
FALSE	never evaluated

439 { -

440 long_int ot; -

441

if (! INT_ADD_WRAPV (t, delta * direction, &ot))

! __builtin_ad...irection, &ot)	Description
TRUE	never evaluated
FALSE	never evaluated

442 { -

443 struct tm otm; -

444 ranged_convert (convert, &ot, &otm); -

445

if (! isdst_differ (isdst, otm.tm_isdst))

! isdst_differ... otm.tm_isdst)	Description
TRUE	never evaluated
FALSE	never evaluated

446 { -

447 /* We found the desired tm_isdst. -

448 Extrapolate back to the desired time. */ -

449 t = guess_time_tm (year, yday, hour, min, sec, ot, &otm); -

450 ranged_convert (convert, &t, &tm); -

451

goto offset_found;

never executed: goto offset_found;

452 } -

453

}

never executed: end of block

454

}

never executed: end of block

455

}

never executed: end of block

456 -

457

offset_found:

code before this statement never executed: offset_found:

458 /* Set *OFFSET to the low-order bits of T - T0 - NEGATIVE_OFFSET_GUESS. -

459 This is just a heuristic to speed up the next mktime call, and -

460 correctness is unaffected if integer overflow occurs here. */ -

461 INT_SUBTRACT_WRAPV (t, t0, &dt); -

462 INT_SUBTRACT_WRAPV (dt, negative_offset_guess, offset); -

463 -

464

if (LEAP_SECONDS_POSSIBLE && sec_requested != tm.tm_sec)

sec_requested != tm.tm_sec	Description
TRUE	never evaluated
FALSE	never evaluated

465 { -

466 /* Adjust time to reflect the tm_sec requested, not the normalized value. -

467 Also, repair any damage from a false match due to a leap second. */ -

468

long_int sec_adjustment = sec == 0 && tm.tm_sec == 60;

sec == 0	Description
TRUE	never evaluated
FALSE	never evaluated

tm.tm_sec == 60	Description
TRUE	never evaluated
FALSE	never evaluated

469 sec_adjustment -= sec; -

470 sec_adjustment += sec_requested; -

471

if (INT_ADD_WRAPV (t, sec_adjustment, &t)

__builtin_add_...djustment, &t)	Description
TRUE	never evaluated
FALSE	never evaluated

472

|| ! (mktime_min <= t && t <= mktime_max)

mktime_min <= t	Description
TRUE	never evaluated
FALSE	never evaluated

t <= mktime_max	Description
TRUE	never evaluated
FALSE	never evaluated

473

|| ! convert_time (convert, t, &tm))

! convert_time...nvert, t, &tm)	Description
TRUE	never evaluated
FALSE	never evaluated

474

return -1;

never executed: return -1;

475

}

never executed: end of block

476 -

477 *tp = tm; -

478

return t;

never executed: return t;

479 } -

480 -

481 #endif /* NEED_MKTIME_WORKING || NEED_MKTIME_INTERNAL || DEBUG_MKTIME */ -

482 -

483 #if NEED_MKTIME_WORKING || NEED_MKTIME_WINDOWS || DEBUG_MKTIME -

484 -

485 # if NEED_MKTIME_WORKING || DEBUG_MKTIME -

486 static mktime_offset_t localtime_offset; -

487 # endif -

488 -

489 /* Convert *TP to a time_t value. */ -

490 time_t -

491 mktime (struct tm *tp) -

492 { -

493 # if NEED_MKTIME_WINDOWS -

494 /* Rectify the value of the environment variable TZ. -

495 There are four possible kinds of such values: -

496 - Traditional US time zone names, e.g. "PST8PDT". Syntax: see -

497 <https://msdn.microsoft.com/en-us/library/90s5c885.aspx> -

498 - Time zone names based on geography, that contain one or more -

499 slashes, e.g. "Europe/Moscow". -

500 - Time zone names based on geography, without slashes, e.g. -

501 "Singapore". -

502 - Time zone names that contain explicit DST rules. Syntax: see -

503 <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03> -

504 The Microsoft CRT understands only the first kind. It produces incorrect -

505 results if the value of TZ is of the other kinds. -

506 But in a Cygwin environment, /etc/profile.d/tzset.sh sets TZ to a value -

507 of the second kind for most geographies, or of the first kind in a few -

508 other geographies. If it is of the second kind, neutralize it. For the -

509 Microsoft CRT, an absent or empty TZ means the time zone that the user -

510 has set in the Windows Control Panel. -

511 If the value of TZ is of the third or fourth kind -- Cygwin programs -

512 understand these syntaxes as well --, it does not matter whether we -

513 neutralize it or not, since these values occur only when a Cygwin user -

514 has set TZ explicitly; this case is 1. rare and 2. under the user's -

515 responsibility. */ -

516 const char *tz = getenv ("TZ"); -

517 if (tz != NULL && strchr (tz, '/') != NULL) -

518 _putenv ("TZ="); -

519 # endif -

520 -

521 # if NEED_MKTIME_WORKING || DEBUG_MKTIME -

522 # ifdef _LIBC -

523 /* POSIX.1 8.1.1 requires that whenever mktime() is called, the -

524 time zone names contained in the external variable 'tzname' shall -

525 be set as if the tzset() function had been called. */ -

526 __tzset (); -

527 # elif HAVE_TZSET -

528 tzset (); -

529 # endif -

530 -

531 return __mktime_internal (tp, __localtime_r, &localtime_offset); -

532 # else -

533 # undef mktime -

534 return mktime (tp); -

535 # endif -

536 } -

537 -

538 #endif /* NEED_MKTIME_WORKING || NEED_MKTIME_WINDOWS || DEBUG_MKTIME */ -

539 -

540 #ifdef weak_alias -

541 weak_alias (mktime, timelocal) -

542 #endif -

543 -

544 #ifdef _LIBC -

545 libc_hidden_def (mktime) -

546 libc_hidden_weak (timelocal) -

547 #endif -

548 -

549 #if DEBUG_MKTIME -

550 -

551 static int -

552 not_equal_tm (const struct tm *a, const struct tm *b) -

553 { -

554 return ((a->tm_sec ^ b->tm_sec) -

555 | (a->tm_min ^ b->tm_min) -

556 | (a->tm_hour ^ b->tm_hour) -

557 | (a->tm_mday ^ b->tm_mday) -

558 | (a->tm_mon ^ b->tm_mon) -

559 | (a->tm_year ^ b->tm_year) -

560 | (a->tm_yday ^ b->tm_yday) -

561 | isdst_differ (a->tm_isdst, b->tm_isdst)); -

562 } -

563 -

564 static void -

565 print_tm (const struct tm *tp) -

566 { -

567 if (tp) -

568 printf ("%04d-%02d-%02d %02d:%02d:%02d yday %03d wday %d isdst %d", -

569 tp->tm_year + TM_YEAR_BASE, tp->tm_mon + 1, tp->tm_mday, -

570 tp->tm_hour, tp->tm_min, tp->tm_sec, -

571 tp->tm_yday, tp->tm_wday, tp->tm_isdst); -

572 else -

573 printf ("0"); -

574 } -

575 -

576 static int -

577 check_result (time_t tk, struct tm tmk, time_t tl, const struct tm *lt) -

578 { -

579 if (tk != tl || !lt || not_equal_tm (&tmk, lt)) -

580 { -

581 printf ("mktime ("); -

582 print_tm (lt); -

583 printf (")\nyields ("); -

584 print_tm (&tmk); -

585 printf (") == %ld, should be %ld\n", (long int) tk, (long int) tl); -

586 return 1; -

587 } -

588 -

589 return 0; -

590 } -

591 -

592 int -

593 main (int argc, char **argv) -

594 { -

595 int status = 0; -

596 struct tm tm, tmk, tml; -

597 struct tm *lt; -

598 time_t tk, tl, tl1; -

599 char trailer; -

600 -

601 /* Sanity check, plus call tzset. */ -

602 tl = 0; -

603 if (! localtime (&tl)) -

604 { -

605 printf ("localtime (0) fails\n"); -

606 status = 1; -

607 } -

608 -

609 if ((argc == 3 || argc == 4) -

610 && (sscanf (argv[1], "%d-%d-%d%c", -

611 &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &trailer) -

612 == 3) -

613 && (sscanf (argv[2], "%d:%d:%d%c", -

614 &tm.tm_hour, &tm.tm_min, &tm.tm_sec, &trailer) -

615 == 3)) -

616 { -

617 tm.tm_year -= TM_YEAR_BASE; -

618 tm.tm_mon--; -

619 tm.tm_isdst = argc == 3 ? -1 : atoi (argv[3]); -

620 tmk = tm; -

621 tl = mktime (&tmk); -

622 lt = localtime_r (&tl, &tml); -

623 printf ("mktime returns %ld == ", (long int) tl); -

624 print_tm (&tmk); -

625 printf ("\n"); -

626 status = check_result (tl, tmk, tl, lt); -

627 } -

628 else if (argc == 4 || (argc == 5 && strcmp (argv[4], "-") == 0)) -

629 { -

630 time_t from = atol (argv[1]); -

631 time_t by = atol (argv[2]); -

632 time_t to = atol (argv[3]); -

633 -

634 if (argc == 4) -

635 for (tl = from; by < 0 ? to <= tl : tl <= to; tl = tl1) -

636 { -

637 lt = localtime_r (&tl, &tml); -

638 if (lt) -

639 { -

640 tmk = tml; -

641 tk = mktime (&tmk); -

642 status |= check_result (tk, tmk, tl, &tml); -

643 } -

644 else -

645 { -

646 printf ("localtime_r (%ld) yields 0\n", (long int) tl); -

647 status = 1; -

648 } -

649 tl1 = tl + by; -

650 if ((tl1 < tl) != (by < 0)) -

651 break; -

652 } -

653 else -

654 for (tl = from; by < 0 ? to <= tl : tl <= to; tl = tl1) -

655 { -

656 /* Null benchmark. */ -

657 lt = localtime_r (&tl, &tml); -

658 if (lt) -

659 { -

660 tmk = tml; -

661 tk = tl; -

662 status |= check_result (tk, tmk, tl, &tml); -

663 } -

664 else -

665 { -

666 printf ("localtime_r (%ld) yields 0\n", (long int) tl); -

667 status = 1; -

668 } -

669 tl1 = tl + by; -

670 if ((tl1 < tl) != (by < 0)) -

671 break; -

672 } -

673 } -

674 else -

675 printf ("Usage:\ -

676 \t%s YYYY-MM-DD HH:MM:SS [ISDST] # Test given time.\n\ -

677 \t%s FROM BY TO # Test values FROM, FROM+BY, ..., TO.\n\ -

678 \t%s FROM BY TO - # Do not test those values (for benchmark).\n", -

679 argv[0], argv[0], argv[0]); -

680 -

681 return status; -

682 } -

683 -

684 #endif /* DEBUG_MKTIME */ -

685 -

686 /* -

687 Local Variables: -

688 compile-command: "gcc -DDEBUG_MKTIME -I. -Wall -W -O2 -g mktime.c -o mktime" -

689 End: -

690 */ -

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