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 __FBSDID("$FreeBSD$");
  49
  50 #include "namespace.h"
  51 #include <time.h>
  52 #include <ctype.h>
  53 #include <errno.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <pthread.h>
  57 #include "private.h"
  58 #include "un-namespace.h"
  59 #include "libc_private.h"
  60 #include "timelocal.h"
  61 #include "tzfile.h"
  62
  63 static char * _strptime(const char *, const char *, struct tm *, int *, locale_t);
  64
  65 #define asizeof(a)      (sizeof(a) / sizeof((a)[0]))
  66
  67 #define FLAG_NONE       (1 << 0)
  68 #define FLAG_YEAR       (1 << 1)
  69 #define FLAG_MONTH      (1 << 2)
  70 #define FLAG_YDAY       (1 << 3)
  71 #define FLAG_MDAY       (1 << 4)
  72 #define FLAG_WDAY       (1 << 5)
  73
  74 /*
  75  * Calculate the week day of the first day of a year. Valid for
  76  * the Gregorian calendar, which began Sept 14, 1752 in the UK
  77  * and its colonies. Ref:
  78  * http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week
  79  */
  80
  81 static int
  82 first_wday_of(int year)
  83 {
  84         return (((2 * (3 - (year / 100) % 4)) + (year % 100) +
  85                 ((year % 100) / 4) + (isleap(year) ? 6 : 0) + 1) % 7);
  86 }
  87
  88 static char *
  89 _strptime(const char *buf, const char *fmt, struct tm *tm, int *GMTp,
  90                 locale_t locale)
  91 {
  92         char    c;
  93         const char *ptr;
  94         int     day_offset = -1, wday_offset;
  95         int week_offset;
  96         int     i, len;
  97         int flags;
  98         int Ealternative, Oalternative;
  99         int century, year;
 100         const struct lc_time_T *tptr = __get_current_time_locale(locale);
 101         static int start_of_month[2][13] = {
 102                 {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
 103                 {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
 104         };
 105
 106         flags = FLAG_NONE;
 107         century = -1;
 108         year = -1;
 109
 110         ptr = fmt;
 111         while (*ptr != 0) {
 112                 c = *ptr++;
 113
 114                 if (c != '%') {
 115                         if (isspace_l((unsigned char)c, locale))
 116                                 while (*buf != 0 &&
 117                                        isspace_l((unsigned char)*buf, locale))
 118                                         buf++;
 119                         else if (c != *buf++)
 120                                 return (NULL);
 121                         continue;
 122                 }
 123
 124                 Ealternative = 0;
 125                 Oalternative = 0;
 126 label:
 127                 c = *ptr++;
 128                 switch (c) {
 129                 case '%':
 130                         if (*buf++ != '%')
 131                                 return (NULL);
 132                         break;
 133
 134                 case '+':
 135                         buf = _strptime(buf, tptr->date_fmt, tm, GMTp, locale);
 136                         if (buf == NULL)
 137                                 return (NULL);
 138                         flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 139                         break;
 140
 141                 case 'C':
 142                         if (!isdigit_l((unsigned char)*buf, locale))
 143                                 return (NULL);
 144
 145                         /* XXX This will break for 3-digit centuries. */
 146                         len = 2;
 147                         for (i = 0; len && *buf != 0 &&
 148                              isdigit_l((unsigned char)*buf, locale); buf++) {
 149                                 i *= 10;
 150                                 i += *buf - '0';
 151                                 len--;
 152                         }
 153
 154                         century = i;
 155                         flags |= FLAG_YEAR;
 156
 157                         break;
 158
 159                 case 'c':
 160                         buf = _strptime(buf, tptr->c_fmt, tm, GMTp, locale);
 161                         if (buf == NULL)
 162                                 return (NULL);
 163                         flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 164                         break;
 165
 166                 case 'D':
 167                         buf = _strptime(buf, "%m/%d/%y", tm, GMTp, locale);
 168                         if (buf == NULL)
 169                                 return (NULL);
 170                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 171                         break;
 172
 173                 case 'E':
 174                         if (Ealternative || Oalternative)
 175                                 break;
 176                         Ealternative++;
 177                         goto label;
 178
 179                 case 'O':
 180                         if (Ealternative || Oalternative)
 181                                 break;
 182                         Oalternative++;
 183                         goto label;
 184
 185                 case 'F':
 186                         buf = _strptime(buf, "%Y-%m-%d", tm, GMTp, locale);
 187                         if (buf == NULL)
 188                                 return (NULL);
 189                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 190                         break;
 191
 192                 case 'R':
 193                         buf = _strptime(buf, "%H:%M", tm, GMTp, locale);
 194                         if (buf == NULL)
 195                                 return (NULL);
 196                         break;
 197
 198                 case 'r':
 199                         buf = _strptime(buf, tptr->ampm_fmt, tm, GMTp, locale);
 200                         if (buf == NULL)
 201                                 return (NULL);
 202                         break;
 203
 204                 case 'T':
 205                         buf = _strptime(buf, "%H:%M:%S", tm, GMTp, locale);
 206                         if (buf == NULL)
 207                                 return (NULL);
 208                         break;
 209
 210                 case 'X':
 211                         buf = _strptime(buf, tptr->X_fmt, tm, GMTp, locale);
 212                         if (buf == NULL)
 213                                 return (NULL);
 214                         break;
 215
 216                 case 'x':
 217                         buf = _strptime(buf, tptr->x_fmt, tm, GMTp, locale);
 218                         if (buf == NULL)
 219                                 return (NULL);
 220                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 221                         break;
 222
 223                 case 'j':
 224                         if (!isdigit_l((unsigned char)*buf, locale))
 225                                 return (NULL);
 226
 227                         len = 3;
 228                         for (i = 0; len && *buf != 0 &&
 229                              isdigit_l((unsigned char)*buf, locale); buf++){
 230                                 i *= 10;
 231                                 i += *buf - '0';
 232                                 len--;
 233                         }
 234                         if (i < 1 || i > 366)
 235                                 return (NULL);
 236
 237                         tm->tm_yday = i - 1;
 238                         flags |= FLAG_YDAY;
 239
 240                         break;
 241
 242                 case 'M':
 243                 case 'S':
 244                         if (*buf == 0 ||
 245                                 isspace_l((unsigned char)*buf, locale))
 246                                 break;
 247
 248                         if (!isdigit_l((unsigned char)*buf, locale))
 249                                 return (NULL);
 250
 251                         len = 2;
 252                         for (i = 0; len && *buf != 0 &&
 253                                 isdigit_l((unsigned char)*buf, locale); buf++){
 254                                 i *= 10;
 255                                 i += *buf - '0';
 256                                 len--;
 257                         }
 258
 259                         if (c == 'M') {
 260                                 if (i > 59)
 261                                         return (NULL);
 262                                 tm->tm_min = i;
 263                         } else {
 264                                 if (i > 60)
 265                                         return (NULL);
 266                                 tm->tm_sec = i;
 267                         }
 268
 269                         break;
 270
 271                 case 'H':
 272                 case 'I':
 273                 case 'k':
 274                 case 'l':
 275                         /*
 276                          * %k and %l specifiers are documented as being
 277                          * blank-padded.  However, there is no harm in
 278                          * allowing zero-padding.
 279                          *
 280                          * XXX %k and %l specifiers may gobble one too many
 281                          * digits if used incorrectly.
 282                          */
 283
 284                         len = 2;
 285                         if ((c == 'k' || c == 'l') &&
 286                             isblank_l((unsigned char)*buf, locale)) {
 287                                 buf++;
 288                                 len = 1;
 289                         }
 290
 291                         if (!isdigit_l((unsigned char)*buf, locale))
 292                                 return (NULL);
 293
 294                         for (i = 0; len && *buf != 0 &&
 295                              isdigit_l((unsigned char)*buf, locale); buf++) {
 296                                 i *= 10;
 297                                 i += *buf - '0';
 298                                 len--;
 299                         }
 300                         if (c == 'H' || c == 'k') {
 301                                 if (i > 23)
 302                                         return (NULL);
 303                         } else if (i == 0 || i > 12)
 304                                 return (NULL);
 305
 306                         tm->tm_hour = i;
 307
 308                         break;
 309
 310                 case 'p':
 311                         /*
 312                          * XXX This is bogus if parsed before hour-related
 313                          * specifiers.
 314                          */
 315                         if (tm->tm_hour > 12)
 316                                 return (NULL);
 317
 318                         len = strlen(tptr->am);
 319                         if (strncasecmp_l(buf, tptr->am, len, locale) == 0) {
 320                                 if (tm->tm_hour == 12)
 321                                         tm->tm_hour = 0;
 322                                 buf += len;
 323                                 break;
 324                         }
 325
 326                         len = strlen(tptr->pm);
 327                         if (strncasecmp_l(buf, tptr->pm, len, locale) == 0) {
 328                                 if (tm->tm_hour != 12)
 329                                         tm->tm_hour += 12;
 330                                 buf += len;
 331                                 break;
 332                         }
 333
 334                         return (NULL);
 335
 336                 case 'A':
 337                 case 'a':
 338                         for (i = 0; i < asizeof(tptr->weekday); i++) {
 339                                 len = strlen(tptr->weekday[i]);
 340                                 if (strncasecmp_l(buf, tptr->weekday[i],
 341                                                 len, locale) == 0)
 342                                         break;
 343                                 len = strlen(tptr->wday[i]);
 344                                 if (strncasecmp_l(buf, tptr->wday[i],
 345                                                 len, locale) == 0)
 346                                         break;
 347                         }
 348                         if (i == asizeof(tptr->weekday))
 349                                 return (NULL);
 350
 351                         buf += len;
 352                         tm->tm_wday = i;
 353                         flags |= FLAG_WDAY;
 354                         break;
 355
 356                 case 'U':
 357                 case 'W':
 358                         /*
 359                          * XXX This is bogus, as we can not assume any valid
 360                          * information present in the tm structure at this
 361                          * point to calculate a real value, so just check the
 362                          * range for now.
 363                          */
 364                         if (!isdigit_l((unsigned char)*buf, locale))
 365                                 return (NULL);
 366
 367                         len = 2;
 368                         for (i = 0; len && *buf != 0 &&
 369                              isdigit_l((unsigned char)*buf, locale); buf++) {
 370                                 i *= 10;
 371                                 i += *buf - '0';
 372                                 len--;
 373                         }
 374                         if (i > 53)
 375                                 return (NULL);
 376
 377                         if (c == 'U')
 378                                 day_offset = TM_SUNDAY;
 379                         else
 380                                 day_offset = TM_MONDAY;
 381
 382
 383                         week_offset = i;
 384
 385                         break;
 386
 387                 case 'u':
 388                 case 'w':
 389                         if (!isdigit_l((unsigned char)*buf, locale))
 390                                 return (NULL);
 391
 392                         i = *buf++ - '0';
 393                         if (i < 0 || i > 7 || (c == 'u' && i < 1) ||
 394                             (c == 'w' && i > 6))
 395                                 return (NULL);
 396
 397                         tm->tm_wday = i % 7;
 398                         flags |= FLAG_WDAY;
 399
 400                         break;
 401
 402                 case 'e':
 403                         /*
 404                          * With %e format, our strftime(3) adds a blank space
 405                          * before single digits.
 406                          */
 407                         if (*buf != 0 &&
 408                             isspace_l((unsigned char)*buf, locale))
 409                                buf++;
 410                         /* FALLTHROUGH */
 411                 case 'd':
 412                         /*
 413                          * The %e specifier was once explicitly documented as
 414                          * not being zero-padded but was later changed to
 415                          * equivalent to %d.  There is no harm in allowing
 416                          * such padding.
 417                          *
 418                          * XXX The %e specifier may gobble one too many
 419                          * digits if used incorrectly.
 420                          */
 421                         if (!isdigit_l((unsigned char)*buf, locale))
 422                                 return (NULL);
 423
 424                         len = 2;
 425                         for (i = 0; len && *buf != 0 &&
 426                              isdigit_l((unsigned char)*buf, locale); buf++) {
 427                                 i *= 10;
 428                                 i += *buf - '0';
 429                                 len--;
 430                         }
 431                         if (i == 0 || i > 31)
 432                                 return (NULL);
 433
 434                         tm->tm_mday = i;
 435                         flags |= FLAG_MDAY;
 436
 437                         break;
 438
 439                 case 'B':
 440                 case 'b':
 441                 case 'h':
 442                         for (i = 0; i < asizeof(tptr->month); i++) {
 443                                 if (Oalternative) {
 444                                         if (c == 'B') {
 445                                                 len = strlen(tptr->alt_month[i]);
 446                                                 if (strncasecmp_l(buf,
 447                                                                 tptr->alt_month[i],
 448                                                                 len, locale) == 0)
 449                                                         break;
 450                                         }
 451                                 } else {
 452                                         len = strlen(tptr->month[i]);
 453                                         if (strncasecmp_l(buf, tptr->month[i],
 454                                                         len, locale) == 0)
 455                                                 break;
 456                                 }
 457                         }
 458                         /*
 459                          * Try the abbreviated month name if the full name
 460                          * wasn't found and Oalternative was not requested.
 461                          */
 462                         if (i == asizeof(tptr->month) && !Oalternative) {
 463                                 for (i = 0; i < asizeof(tptr->month); i++) {
 464                                         len = strlen(tptr->mon[i]);
 465                                         if (strncasecmp_l(buf, tptr->mon[i],
 466                                                         len, locale) == 0)
 467                                                 break;
 468                                 }
 469                         }
 470                         if (i == asizeof(tptr->month))
 471                                 return (NULL);
 472
 473                         tm->tm_mon = i;
 474                         buf += len;
 475                         flags |= FLAG_MONTH;
 476
 477                         break;
 478
 479                 case 'm':
 480                         if (!isdigit_l((unsigned char)*buf, locale))
 481                                 return (NULL);
 482
 483                         len = 2;
 484                         for (i = 0; len && *buf != 0 &&
 485                              isdigit_l((unsigned char)*buf, locale); buf++) {
 486                                 i *= 10;
 487                                 i += *buf - '0';
 488                                 len--;
 489                         }
 490                         if (i < 1 || i > 12)
 491                                 return (NULL);
 492
 493                         tm->tm_mon = i - 1;
 494                         flags |= FLAG_MONTH;
 495
 496                         break;
 497
 498                 case 's':
 499                         {
 500                         char *cp;
 501                         int sverrno;
 502                         long n;
 503                         time_t t;
 504
 505                         sverrno = errno;
 506                         errno = 0;
 507                         n = strtol_l(buf, &cp, 10, locale);
 508                         if (errno == ERANGE || (long)(t = n) != n) {
 509                                 errno = sverrno;
 510                                 return (NULL);
 511                         }
 512                         errno = sverrno;
 513                         buf = cp;
 514                         if (gmtime_r(&t, tm) == NULL)
 515                                 return (NULL);
 516                         *GMTp = 1;
 517                         flags |= FLAG_YDAY | FLAG_WDAY | FLAG_MONTH |
 518                             FLAG_MDAY | FLAG_YEAR;
 519                         }
 520                         break;
 521
 522                 case 'Y':
 523                 case 'y':
 524                         if (*buf == 0 ||
 525                             isspace_l((unsigned char)*buf, locale))
 526                                 break;
 527
 528                         if (!isdigit_l((unsigned char)*buf, locale))
 529                                 return (NULL);
 530
 531                         len = (c == 'Y') ? 4 : 2;
 532                         for (i = 0; len && *buf != 0 &&
 533                              isdigit_l((unsigned char)*buf, locale); buf++) {
 534                                 i *= 10;
 535                                 i += *buf - '0';
 536                                 len--;
 537                         }
 538                         if (c == 'Y')
 539                                 century = i / 100;
 540                         year = i % 100;
 541
 542                         flags |= FLAG_YEAR;
 543
 544                         break;
 545
 546                 case 'Z':
 547                         {
 548                         const char *cp;
 549                         char *zonestr;
 550
 551                         for (cp = buf; *cp &&
 552                              isupper_l((unsigned char)*cp, locale); ++cp) {
 553                                 /*empty*/}
 554                         if (cp - buf) {
 555                                 zonestr = alloca(cp - buf + 1);
 556                                 strncpy(zonestr, buf, cp - buf);
 557                                 zonestr[cp - buf] = '\0';
 558                                 tzset();
 559                                 if (0 == strcmp(zonestr, "GMT") ||
 560                                     0 == strcmp(zonestr, "UTC")) {
 561                                     *GMTp = 1;
 562                                 } else if (0 == strcmp(zonestr, tzname[0])) {
 563                                     tm->tm_isdst = 0;
 564                                 } else if (0 == strcmp(zonestr, tzname[1])) {
 565                                     tm->tm_isdst = 1;
 566                                 } else {
 567                                     return (NULL);
 568                                 }
 569                                 buf += cp - buf;
 570                         }
 571                         }
 572                         break;
 573
 574                 case 'z':
 575                         {
 576                         int sign = 1;
 577
 578                         if (*buf != '+') {
 579                                 if (*buf == '-')
 580                                         sign = -1;
 581                                 else
 582                                         return (NULL);
 583                         }
 584
 585                         buf++;
 586                         i = 0;
 587                         for (len = 4; len > 0; len--) {
 588                                 if (isdigit_l((unsigned char)*buf, locale)) {
 589                                         i *= 10;
 590                                         i += *buf - '0';
 591                                         buf++;
 592                                 } else if (len == 2) {
 593                                         i *= 100;
 594                                         break;
 595                                 } else
 596                                         return (NULL);
 597                         }
 598
 599                         if (i > 1400 || (sign == -1 && i > 1200) ||
 600                             (i % 100) >= 60)
 601                                 return (NULL);
 602                         tm->tm_hour -= sign * (i / 100);
 603                         tm->tm_min  -= sign * (i % 100);
 604                         *GMTp = 1;
 605                         }
 606                         break;
 607
 608                 case 'n':
 609                 case 't':
 610                         while (isspace_l((unsigned char)*buf, locale))
 611                                 buf++;
 612                         break;
 613
 614                 default:
 615                         return (NULL);
 616                 }
 617         }
 618
 619         if (century != -1 || year != -1) {
 620                 if (year == -1)
 621                         year = 0;
 622                 if (century == -1) {
 623                         if (year < 69)
 624                                 year += 100;
 625                 } else
 626                         year += century * 100 - TM_YEAR_BASE;
 627                 tm->tm_year = year;
 628         }
 629
 630         if (!(flags & FLAG_YDAY) && (flags & FLAG_YEAR)) {
 631                 if ((flags & (FLAG_MONTH | FLAG_MDAY)) ==
 632                     (FLAG_MONTH | FLAG_MDAY)) {
 633                         tm->tm_yday = start_of_month[isleap(tm->tm_year +
 634                             TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
 635                         flags |= FLAG_YDAY;
 636                 } else if (day_offset != -1) {
 637                         int tmpwday, tmpyday, fwo;
 638
 639                         fwo = first_wday_of(tm->tm_year + TM_YEAR_BASE);
 640                         /* No incomplete week (week 0). */
 641                         if (week_offset == 0 && fwo == day_offset)
 642                                 return (NULL);
 643
 644                         /* Set the date to the first Sunday (or Monday)
 645                          * of the specified week of the year.
 646                          */
 647                         tmpwday = (flags & FLAG_WDAY) ? tm->tm_wday :
 648                             day_offset;
 649                         tmpyday = (7 - fwo + day_offset) % 7 +
 650                             (week_offset - 1) * 7 +
 651                             (tmpwday - day_offset + 7) % 7;
 652                         /* Impossible yday for incomplete week (week 0). */
 653                         if (tmpyday < 0) {
 654                                 if (flags & FLAG_WDAY)
 655                                         return (NULL);
 656                                 tmpyday = 0;
 657                         }
 658                         tm->tm_yday = tmpyday;
 659                         flags |= FLAG_YDAY;
 660                 }
 661         }
 662
 663         if ((flags & (FLAG_YEAR | FLAG_YDAY)) == (FLAG_YEAR | FLAG_YDAY)) {
 664                 if (!(flags & FLAG_MONTH)) {
 665                         i = 0;
 666                         while (tm->tm_yday >=
 667                             start_of_month[isleap(tm->tm_year +
 668                             TM_YEAR_BASE)][i])
 669                                 i++;
 670                         if (i > 12) {
 671                                 i = 1;
 672                                 tm->tm_yday -=
 673                                     start_of_month[isleap(tm->tm_year +
 674                                     TM_YEAR_BASE)][12];
 675                                 tm->tm_year++;
 676                         }
 677                         tm->tm_mon = i - 1;
 678                         flags |= FLAG_MONTH;
 679                 }
 680                 if (!(flags & FLAG_MDAY)) {
 681                         tm->tm_mday = tm->tm_yday -
 682                             start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)]
 683                             [tm->tm_mon] + 1;
 684                         flags |= FLAG_MDAY;
 685                 }
 686                 if (!(flags & FLAG_WDAY)) {
 687                         i = 0;
 688                         wday_offset = first_wday_of(tm->tm_year);
 689                         while (i++ <= tm->tm_yday) {
 690                                 if (wday_offset++ >= 6)
 691                                         wday_offset = 0;
 692                         }
 693                         tm->tm_wday = wday_offset;
 694                         flags |= FLAG_WDAY;
 695                 }
 696         }
 697
 698         return ((char *)buf);
 699 }
 700
 701 char *
 702 strptime_l(const char * __restrict buf, const char * __restrict fmt,
 703     struct tm * __restrict tm, locale_t loc)
 704 {
 705         char *ret;
 706         int gmt;
 707         FIX_LOCALE(loc);
 708
 709         gmt = 0;
 710         ret = _strptime(buf, fmt, tm, &gmt, loc);
 711         if (ret && gmt) {
 712                 time_t t = timegm(tm);
 713
 714                 localtime_r(&t, tm);
 715         }
 716
 717         return (ret);
 718 }
 719
 720 char *
 721 strptime(const char * __restrict buf, const char * __restrict fmt,
 722     struct tm * __restrict tm)
 723 {
 724         return strptime_l(buf, fmt, tm, __get_locale());
 725 }