lib/libc/stdtime/strptime.c

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