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