lib/libc/stdtime/strptime.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2014 Gary Mills
   5  * Copyright 2011, Nexenta Systems, Inc.  All rights reserved.
   6  * Copyright (c) 1994 Powerdog Industries.  All rights reserved.
   7  *
   8  * Copyright (c) 2011 The FreeBSD Foundation
   9  *
  10  * Portions of this software were developed by David Chisnall
  11  * under sponsorship from the FreeBSD Foundation.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer
  20  *    in the documentation and/or other materials provided with the
  21  *    distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY POWERDOG INDUSTRIES ``AS IS'' AND ANY
  24  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE POWERDOG INDUSTRIES BE
  27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  32  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  33  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * The views and conclusions contained in the software and documentation
  36  * are those of the authors and should not be interpreted as representing
  37  * official policies, either expressed or implied, of Powerdog Industries.
  38  */
  39
  40 #include <sys/cdefs.h>
  41 #ifndef lint
  42 #ifndef NOID
  43 static char copyright[] __unused =
  44 "@(#) Copyright (c) 1994 Powerdog Industries.  All rights reserved.";
  45 static char sccsid[] __unused = "@(#)strptime.c 0.1 (Powerdog) 94/03/27";
  46 #endif /* !defined NOID */
  47 #endif /* not lint */
  48 #include "namespace.h"
  49 #include <time.h>
  50 #include <ctype.h>
  51 #include <errno.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <pthread.h>
  55 #include "private.h"
  56 #include "un-namespace.h"
  57 #include "libc_private.h"
  58 #include "timelocal.h"
  59 #include "tzfile.h"
  60
  61 static char * _strptime(const char *, const char *, struct tm *, int *, locale_t);
  62
  63 #define asizeof(a)      (sizeof(a) / sizeof((a)[0]))
  64
  65 #define FLAG_NONE       (1 << 0)
  66 #define FLAG_YEAR       (1 << 1)
  67 #define FLAG_MONTH      (1 << 2)
  68 #define FLAG_YDAY       (1 << 3)
  69 #define FLAG_MDAY       (1 << 4)
  70 #define FLAG_WDAY       (1 << 5)
  71
  72 /*
  73  * Calculate the week day of the first day of a year. Valid for
  74  * the Gregorian calendar, which began Sept 14, 1752 in the UK
  75  * and its colonies. Ref:
  76  * http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
  77  */
  78
  79 static int
  80 first_wday_of(int year)
  81 {
  82         return (((2 * (3 - (year / 100) % 4)) + (year % 100) +
  83                 ((year % 100) / 4) + (isleap(year) ? 6 : 0) + 1) % 7);
  84 }
  85
  86 static char *
  87 _strptime(const char *buf, const char *fmt, struct tm *tm, int *GMTp,
  88                 locale_t locale)
  89 {
  90         char    c;
  91         const char *ptr;
  92         int     day_offset = -1, wday_offset;
  93         int week_offset;
  94         int     i, len;
  95         int flags;
  96         int Ealternative, Oalternative;
  97         int century, year;
  98         const struct lc_time_T *tptr = __get_current_time_locale(locale);
  99         static int start_of_month[2][13] = {
 100                 {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
 101                 {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
 102         };
 103
 104         flags = FLAG_NONE;
 105         century = -1;
 106         year = -1;
 107
 108         ptr = fmt;
 109         while (*ptr != 0) {
 110                 c = *ptr++;
 111
 112                 if (c != '%') {
 113                         if (isspace_l((unsigned char)c, locale))
 114                                 while (*buf != 0 &&
 115                                        isspace_l((unsigned char)*buf, locale))
 116                                         buf++;
 117                         else if (c != *buf++)
 118                                 return (NULL);
 119                         continue;
 120                 }
 121
 122                 Ealternative = 0;
 123                 Oalternative = 0;
 124 label:
 125                 c = *ptr++;
 126                 switch (c) {
 127                 case '%':
 128                         if (*buf++ != '%')
 129                                 return (NULL);
 130                         break;
 131
 132                 case '+':
 133                         buf = _strptime(buf, tptr->date_fmt, tm, GMTp, locale);
 134                         if (buf == NULL)
 135                                 return (NULL);
 136                         flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 137                         break;
 138
 139                 case 'C':
 140                         if (!isdigit_l((unsigned char)*buf, locale))
 141                                 return (NULL);
 142
 143                         /* XXX This will break for 3-digit centuries. */
 144                         len = 2;
 145                         for (i = 0; len && *buf != 0 &&
 146                              isdigit_l((unsigned char)*buf, locale); buf++) {
 147                                 i *= 10;
 148                                 i += *buf - '0';
 149                                 len--;
 150                         }
 151
 152                         century = i;
 153                         flags |= FLAG_YEAR;
 154
 155                         break;
 156
 157                 case 'c':
 158                         buf = _strptime(buf, tptr->c_fmt, tm, GMTp, locale);
 159                         if (buf == NULL)
 160                                 return (NULL);
 161                         flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 162                         break;
 163
 164                 case 'D':
 165                         buf = _strptime(buf, "%m/%d/%y", tm, GMTp, locale);
 166                         if (buf == NULL)
 167                                 return (NULL);
 168                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 169                         break;
 170
 171                 case 'E':
 172                         if (Ealternative || Oalternative)
 173                                 break;
 174                         Ealternative++;
 175                         goto label;
 176
 177                 case 'O':
 178                         if (Ealternative || Oalternative)
 179                                 break;
 180                         Oalternative++;
 181                         goto label;
 182
 183                 case 'F':
 184                         buf = _strptime(buf, "%Y-%m-%d", tm, GMTp, locale);
 185                         if (buf == NULL)
 186                                 return (NULL);
 187                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 188                         break;
 189
 190                 case 'R':
 191                         buf = _strptime(buf, "%H:%M", tm, GMTp, locale);
 192                         if (buf == NULL)
 193                                 return (NULL);
 194                         break;
 195
 196                 case 'r':
 197                         buf = _strptime(buf, tptr->ampm_fmt, tm, GMTp, locale);
 198                         if (buf == NULL)
 199                                 return (NULL);
 200                         break;
 201
 202                 case 'T':
 203                         buf = _strptime(buf, "%H:%M:%S", tm, GMTp, locale);
 204                         if (buf == NULL)
 205                                 return (NULL);
 206                         break;
 207
 208                 case 'X':
 209                         buf = _strptime(buf, tptr->X_fmt, tm, GMTp, locale);
 210                         if (buf == NULL)
 211                                 return (NULL);
 212                         break;
 213
 214                 case 'x':
 215                         buf = _strptime(buf, tptr->x_fmt, tm, GMTp, locale);
 216                         if (buf == NULL)
 217                                 return (NULL);
 218                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 219                         break;
 220
 221                 case 'j':
 222                         if (!isdigit_l((unsigned char)*buf, locale))
 223                                 return (NULL);
 224
 225                         len = 3;
 226                         for (i = 0; len && *buf != 0 &&
 227                              isdigit_l((unsigned char)*buf, locale); buf++){
 228                                 i *= 10;
 229                                 i += *buf - '0';
 230                                 len--;
 231                         }
 232                         if (i < 1 || i > 366)
 233                                 return (NULL);
 234
 235                         tm->tm_yday = i - 1;
 236                         flags |= FLAG_YDAY;
 237
 238                         break;
 239
 240                 case 'M':
 241                 case 'S':
 242                         if (*buf == 0 ||
 243                                 isspace_l((unsigned char)*buf, locale))
 244                                 break;
 245
 246                         if (!isdigit_l((unsigned char)*buf, locale))
 247                                 return (NULL);
 248
 249                         len = 2;
 250                         for (i = 0; len && *buf != 0 &&
 251                                 isdigit_l((unsigned char)*buf, locale); buf++){
 252                                 i *= 10;
 253                                 i += *buf - '0';
 254                                 len--;
 255                         }
 256
 257                         if (c == 'M') {
 258                                 if (i > 59)
 259                                         return (NULL);
 260                                 tm->tm_min = i;
 261                         } else {
 262                                 if (i > 60)
 263                                         return (NULL);
 264                                 tm->tm_sec = i;
 265                         }
 266
 267                         break;
 268
 269                 case 'H':
 270                 case 'I':
 271                 case 'k':
 272                 case 'l':
 273                         /*
 274                          * %k and %l specifiers are documented as being
 275                          * blank-padded.  However, there is no harm in
 276                          * allowing zero-padding.
 277                          *
 278                          * XXX %k and %l specifiers may gobble one too many
 279                          * digits if used incorrectly.
 280                          */
 281
 282                         len = 2;
 283                         if ((c == 'k' || c == 'l') &&
 284                             isblank_l((unsigned char)*buf, locale)) {
 285                                 buf++;
 286                                 len = 1;
 287                         }
 288
 289                         if (!isdigit_l((unsigned char)*buf, locale))
 290                                 return (NULL);
 291
 292                         for (i = 0; len && *buf != 0 &&
 293                              isdigit_l((unsigned char)*buf, locale); buf++) {
 294                                 i *= 10;
 295                                 i += *buf - '0';
 296                                 len--;
 297                         }
 298                         if (c == 'H' || c == 'k') {
 299                                 if (i > 23)
 300                                         return (NULL);
 301                         } else if (i == 0 || i > 12)
 302                                 return (NULL);
 303
 304                         tm->tm_hour = i;
 305
 306                         break;
 307
 308                 case 'p':
 309                         /*
 310                          * XXX This is bogus if parsed before hour-related
 311                          * specifiers.
 312                          */
 313                         if (tm->tm_hour > 12)
 314                                 return (NULL);
 315
 316                         len = strlen(tptr->am);
 317                         if (strncasecmp_l(buf, tptr->am, len, locale) == 0) {
 318                                 if (tm->tm_hour == 12)
 319                                         tm->tm_hour = 0;
 320                                 buf += len;
 321                                 break;
 322                         }
 323
 324                         len = strlen(tptr->pm);
 325                         if (strncasecmp_l(buf, tptr->pm, len, locale) == 0) {
 326                                 if (tm->tm_hour != 12)
 327                                         tm->tm_hour += 12;
 328                                 buf += len;
 329                                 break;
 330                         }
 331
 332                         return (NULL);
 333
 334                 case 'A':
 335                 case 'a':
 336                         for (i = 0; i < asizeof(tptr->weekday); i++) {
 337                                 len = strlen(tptr->weekday[i]);
 338                                 if (strncasecmp_l(buf, tptr->weekday[i],
 339                                                 len, locale) == 0)
 340                                         break;
 341                                 len = strlen(tptr->wday[i]);
 342                                 if (strncasecmp_l(buf, tptr->wday[i],
 343                                                 len, locale) == 0)
 344                                         break;
 345                         }
 346                         if (i == asizeof(tptr->weekday))
 347                                 return (NULL);
 348
 349                         buf += len;
 350                         tm->tm_wday = i;
 351                         flags |= FLAG_WDAY;
 352                         break;
 353
 354                 case 'U':
 355                 case 'W':
 356                         /*
 357                          * XXX This is bogus, as we can not assume any valid
 358                          * information present in the tm structure at this
 359                          * point to calculate a real value, so just check the
 360                          * range for now.
 361                          */
 362                         if (!isdigit_l((unsigned char)*buf, locale))
 363                                 return (NULL);
 364
 365                         len = 2;
 366                         for (i = 0; len && *buf != 0 &&
 367                              isdigit_l((unsigned char)*buf, locale); buf++) {
 368                                 i *= 10;
 369                                 i += *buf - '0';
 370                                 len--;
 371                         }
 372                         if (i > 53)
 373                                 return (NULL);
 374
 375                         if (c == 'U')
 376                                 day_offset = TM_SUNDAY;
 377                         else
 378                                 day_offset = TM_MONDAY;
 379
 380
 381                         week_offset = i;
 382
 383                         break;
 384
 385                 case 'u':
 386                 case 'w':
 387                         if (!isdigit_l((unsigned char)*buf, locale))
 388                                 return (NULL);
 389
 390                         i = *buf++ - '0';
 391                         if (i < 0 || i > 7 || (c == 'u' && i < 1) ||
 392                             (c == 'w' && i > 6))
 393                                 return (NULL);
 394
 395                         tm->tm_wday = i % 7;
 396                         flags |= FLAG_WDAY;
 397
 398                         break;
 399
 400                 case 'e':
 401                         /*
 402                          * With %e format, our strftime(3) adds a blank space
 403                          * before single digits.
 404                          */
 405                         if (*buf != 0 &&
 406                             isspace_l((unsigned char)*buf, locale))
 407                                buf++;
 408                         /* FALLTHROUGH */
 409                 case 'd':
 410                         /*
 411                          * The %e specifier was once explicitly documented as
 412                          * not being zero-padded but was later changed to
 413                          * equivalent to %d.  There is no harm in allowing
 414                          * such padding.
 415                          *
 416                          * XXX The %e specifier may gobble one too many
 417                          * digits if used incorrectly.
 418                          */
 419                         if (!isdigit_l((unsigned char)*buf, locale))
 420                                 return (NULL);
 421
 422                         len = 2;
 423                         for (i = 0; len && *buf != 0 &&
 424                              isdigit_l((unsigned char)*buf, locale); buf++) {
 425                                 i *= 10;
 426                                 i += *buf - '0';
 427                                 len--;
 428                         }
 429                         if (i == 0 || i > 31)
 430                                 return (NULL);
 431
 432                         tm->tm_mday = i;
 433                         flags |= FLAG_MDAY;
 434
 435                         break;
 436
 437                 case 'B':
 438                 case 'b':
 439                 case 'h':
 440                         for (i = 0; i < asizeof(tptr->month); i++) {
 441                                 if (Oalternative) {
 442                                         if (c == 'B') {
 443                                                 len = strlen(tptr->alt_month[i]);
 444                                                 if (strncasecmp_l(buf,
 445                                                                 tptr->alt_month[i],
 446                                                                 len, locale) == 0)
 447                                                         break;
 448                                         }
 449                                 } else {
 450                                         len = strlen(tptr->month[i]);
 451                                         if (strncasecmp_l(buf, tptr->month[i],
 452                                                         len, locale) == 0)
 453                                                 break;
 454                                 }
 455                         }
 456                         /*
 457                          * Try the abbreviated month name if the full name
 458                          * wasn't found and Oalternative was not requested.
 459                          */
 460                         if (i == asizeof(tptr->month) && !Oalternative) {
 461                                 for (i = 0; i < asizeof(tptr->month); i++) {
 462                                         len = strlen(tptr->mon[i]);
 463                                         if (strncasecmp_l(buf, tptr->mon[i],
 464                                                         len, locale) == 0)
 465                                                 break;
 466                                 }
 467                         }
 468                         if (i == asizeof(tptr->month))
 469                                 return (NULL);
 470
 471                         tm->tm_mon = i;
 472                         buf += len;
 473                         flags |= FLAG_MONTH;
 474
 475                         break;
 476
 477                 case 'm':
 478                         if (!isdigit_l((unsigned char)*buf, locale))
 479                                 return (NULL);
 480
 481                         len = 2;
 482                         for (i = 0; len && *buf != 0 &&
 483                              isdigit_l((unsigned char)*buf, locale); buf++) {
 484                                 i *= 10;
 485                                 i += *buf - '0';
 486                                 len--;
 487                         }
 488                         if (i < 1 || i > 12)
 489                                 return (NULL);
 490
 491                         tm->tm_mon = i - 1;
 492                         flags |= FLAG_MONTH;
 493
 494                         break;
 495
 496                 case 's':
 497                         {
 498                         char *cp;
 499                         int sverrno;
 500                         long n;
 501                         time_t t;
 502
 503                         sverrno = errno;
 504                         errno = 0;
 505                         n = strtol_l(buf, &cp, 10, locale);
 506                         if (errno == ERANGE || (long)(t = n) != n) {
 507                                 errno = sverrno;
 508                                 return (NULL);
 509                         }
 510                         errno = sverrno;
 511                         buf = cp;
 512                         if (gmtime_r(&t, tm) == NULL)
 513                                 return (NULL);
 514                         *GMTp = 1;
 515                         flags |= FLAG_YDAY | FLAG_WDAY | FLAG_MONTH |
 516                             FLAG_MDAY | FLAG_YEAR;
 517                         }
 518                         break;
 519
 520                 case 'Y':
 521                 case 'y':
 522                         if (*buf == 0 ||
 523                             isspace_l((unsigned char)*buf, locale))
 524                                 break;
 525
 526                         if (!isdigit_l((unsigned char)*buf, locale))
 527                                 return (NULL);
 528
 529                         len = (c == 'Y') ? 4 : 2;
 530                         for (i = 0; len && *buf != 0 &&
 531                              isdigit_l((unsigned char)*buf, locale); buf++) {
 532                                 i *= 10;
 533                                 i += *buf - '0';
 534                                 len--;
 535                         }
 536                         if (c == 'Y')
 537                                 century = i / 100;
 538                         year = i % 100;
 539
 540                         flags |= FLAG_YEAR;
 541
 542                         break;
 543
 544                 case 'Z':
 545                         {
 546                         const char *cp;
 547                         char *zonestr;
 548
 549                         for (cp = buf; *cp &&
 550                              isupper_l((unsigned char)*cp, locale); ++cp) {
 551                                 /*empty*/}
 552                         if (cp - buf) {
 553                                 zonestr = alloca(cp - buf + 1);
 554                                 strncpy(zonestr, buf, cp - buf);
 555                                 zonestr[cp - buf] = '\0';
 556                                 tzset();
 557                                 if (0 == strcmp(zonestr, "GMT") ||
 558                                     0 == strcmp(zonestr, "UTC")) {
 559                                     *GMTp = 1;
 560                                 } else if (0 == strcmp(zonestr, tzname[0])) {
 561                                     tm->tm_isdst = 0;
 562                                 } else if (0 == strcmp(zonestr, tzname[1])) {
 563                                     tm->tm_isdst = 1;
 564                                 } else {
 565                                     return (NULL);
 566                                 }
 567                                 buf += cp - buf;
 568                         }
 569                         }
 570                         break;
 571
 572                 case 'z':
 573                         {
 574                         int sign = 1;
 575
 576                         if (*buf != '+') {
 577                                 if (*buf == '-')
 578                                         sign = -1;
 579                                 else
 580                                         return (NULL);
 581                         }
 582
 583                         buf++;
 584                         i = 0;
 585                         for (len = 4; len > 0; len--) {
 586                                 if (isdigit_l((unsigned char)*buf, locale)) {
 587                                         i *= 10;
 588                                         i += *buf - '0';
 589                                         buf++;
 590                                 } else if (len == 2) {
 591                                         i *= 100;
 592                                         break;
 593                                 } else
 594                                         return (NULL);
 595                         }
 596
 597                         if (i > 1400 || (sign == -1 && i > 1200) ||
 598                             (i % 100) >= 60)
 599                                 return (NULL);
 600                         tm->tm_hour -= sign * (i / 100);
 601                         tm->tm_min  -= sign * (i % 100);
 602                         *GMTp = 1;
 603                         }
 604                         break;
 605
 606                 case 'n':
 607                 case 't':
 608                         while (isspace_l((unsigned char)*buf, locale))
 609                                 buf++;
 610                         break;
 611
 612                 default:
 613                         return (NULL);
 614                 }
 615         }
 616
 617         if (century != -1 || year != -1) {
 618                 if (year == -1)
 619                         year = 0;
 620                 if (century == -1) {
 621                         if (year < 69)
 622                                 year += 100;
 623                 } else
 624                         year += century * 100 - TM_YEAR_BASE;
 625                 tm->tm_year = year;
 626         }
 627
 628         if (!(flags & FLAG_YDAY) && (flags & FLAG_YEAR)) {
 629                 if ((flags & (FLAG_MONTH | FLAG_MDAY)) ==
 630                     (FLAG_MONTH | FLAG_MDAY)) {
 631                         tm->tm_yday = start_of_month[isleap(tm->tm_year +
 632                             TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
 633                         flags |= FLAG_YDAY;
 634                 } else if (day_offset != -1) {
 635                         int tmpwday, tmpyday, fwo;
 636
 637                         fwo = first_wday_of(tm->tm_year + TM_YEAR_BASE);
 638                         /* No incomplete week (week 0). */
 639                         if (week_offset == 0 && fwo == day_offset)
 640                                 return (NULL);
 641
 642                         /* Set the date to the first Sunday (or Monday)
 643                          * of the specified week of the year.
 644                          */
 645                         tmpwday = (flags & FLAG_WDAY) ? tm->tm_wday :
 646                             day_offset;
 647                         tmpyday = (7 - fwo + day_offset) % 7 +
 648                             (week_offset - 1) * 7 +
 649                             (tmpwday - day_offset + 7) % 7;
 650                         /* Impossible yday for incomplete week (week 0). */
 651                         if (tmpyday < 0) {
 652                                 if (flags & FLAG_WDAY)
 653                                         return (NULL);
 654                                 tmpyday = 0;
 655                         }
 656                         tm->tm_yday = tmpyday;
 657                         flags |= FLAG_YDAY;
 658                 }
 659         }
 660
 661         if ((flags & (FLAG_YEAR | FLAG_YDAY)) == (FLAG_YEAR | FLAG_YDAY)) {
 662                 if (!(flags & FLAG_MONTH)) {
 663                         i = 0;
 664                         while (tm->tm_yday >=
 665                             start_of_month[isleap(tm->tm_year +
 666                             TM_YEAR_BASE)][i])
 667                                 i++;
 668                         if (i > 12) {
 669                                 i = 1;
 670                                 tm->tm_yday -=
 671                                     start_of_month[isleap(tm->tm_year +
 672                                     TM_YEAR_BASE)][12];
 673                                 tm->tm_year++;
 674                         }
 675                         tm->tm_mon = i - 1;
 676                         flags |= FLAG_MONTH;
 677                 }
 678                 if (!(flags & FLAG_MDAY)) {
 679                         tm->tm_mday = tm->tm_yday -
 680                             start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)]
 681                             [tm->tm_mon] + 1;
 682                         flags |= FLAG_MDAY;
 683                 }
 684                 if (!(flags & FLAG_WDAY)) {
 685                         i = 0;
 686                         wday_offset = first_wday_of(tm->tm_year);
 687                         while (i++ <= tm->tm_yday) {
 688                                 if (wday_offset++ >= 6)
 689                                         wday_offset = 0;
 690                         }
 691                         tm->tm_wday = wday_offset;
 692                         flags |= FLAG_WDAY;
 693                 }
 694         }
 695
 696         return ((char *)buf);
 697 }
 698
 699 char *
 700 strptime_l(const char * __restrict buf, const char * __restrict fmt,
 701     struct tm * __restrict tm, locale_t loc)
 702 {
 703         char *ret;
 704         int gmt;
 705         FIX_LOCALE(loc);
 706
 707         gmt = 0;
 708         ret = _strptime(buf, fmt, tm, &gmt, loc);
 709         if (ret && gmt) {
 710                 time_t t = timegm(tm);
 711
 712                 localtime_r(&t, tm);
 713         }
 714
 715         return (ret);
 716 }
 717
 718 char *
 719 strptime(const char * __restrict buf, const char * __restrict fmt,
 720     struct tm * __restrict tm)
 721 {
 722         return strptime_l(buf, fmt, tm, __get_locale());
 723 }