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         const struct lc_time_T *tptr = __get_current_time_locale(locale);
  99         static int start_of_month[2][13] = {
 100                 {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
 101                 {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
 102         };
 103
 104         flags = FLAG_NONE;
 105
 106         ptr = fmt;
 107         while (*ptr != 0) {
 108                 c = *ptr++;
 109
 110                 if (c != '%') {
 111                         if (isspace_l((unsigned char)c, locale))
 112                                 while (*buf != 0 &&
 113                                        isspace_l((unsigned char)*buf, locale))
 114                                         buf++;
 115                         else if (c != *buf++)
 116                                 return (NULL);
 117                         continue;
 118                 }
 119
 120                 Ealternative = 0;
 121                 Oalternative = 0;
 122 label:
 123                 c = *ptr++;
 124                 switch (c) {
 125                 case '%':
 126                         if (*buf++ != '%')
 127                                 return (NULL);
 128                         break;
 129
 130                 case '+':
 131                         buf = _strptime(buf, tptr->date_fmt, tm, GMTp, locale);
 132                         if (buf == NULL)
 133                                 return (NULL);
 134                         flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 135                         break;
 136
 137                 case 'C':
 138                         if (!isdigit_l((unsigned char)*buf, locale))
 139                                 return (NULL);
 140
 141                         /* XXX This will break for 3-digit centuries. */
 142                         len = 2;
 143                         for (i = 0; len && *buf != 0 &&
 144                              isdigit_l((unsigned char)*buf, locale); buf++) {
 145                                 i *= 10;
 146                                 i += *buf - '0';
 147                                 len--;
 148                         }
 149                         if (i < 19)
 150                                 return (NULL);
 151
 152                         tm->tm_year = i * 100 - TM_YEAR_BASE;
 153                         flags |= FLAG_YEAR;
 154
 155                         break;
 156
 157                 case 'c':
 158                         buf = _strptime(buf, tptr->c_fmt, tm, GMTp, locale);
 159                         if (buf == NULL)
 160                                 return (NULL);
 161                         flags |= FLAG_WDAY | FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 162                         break;
 163
 164                 case 'D':
 165                         buf = _strptime(buf, "%m/%d/%y", tm, GMTp, locale);
 166                         if (buf == NULL)
 167                                 return (NULL);
 168                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 169                         break;
 170
 171                 case 'E':
 172                         if (Ealternative || Oalternative)
 173                                 break;
 174                         Ealternative++;
 175                         goto label;
 176
 177                 case 'O':
 178                         if (Ealternative || Oalternative)
 179                                 break;
 180                         Oalternative++;
 181                         goto label;
 182
 183                 case 'F':
 184                         buf = _strptime(buf, "%Y-%m-%d", tm, GMTp, locale);
 185                         if (buf == NULL)
 186                                 return (NULL);
 187                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 188                         break;
 189
 190                 case 'R':
 191                         buf = _strptime(buf, "%H:%M", tm, GMTp, locale);
 192                         if (buf == NULL)
 193                                 return (NULL);
 194                         break;
 195
 196                 case 'r':
 197                         buf = _strptime(buf, tptr->ampm_fmt, tm, GMTp, locale);
 198                         if (buf == NULL)
 199                                 return (NULL);
 200                         break;
 201
 202                 case 'T':
 203                         buf = _strptime(buf, "%H:%M:%S", tm, GMTp, locale);
 204                         if (buf == NULL)
 205                                 return (NULL);
 206                         break;
 207
 208                 case 'X':
 209                         buf = _strptime(buf, tptr->X_fmt, tm, GMTp, locale);
 210                         if (buf == NULL)
 211                                 return (NULL);
 212                         break;
 213
 214                 case 'x':
 215                         buf = _strptime(buf, tptr->x_fmt, tm, GMTp, locale);
 216                         if (buf == NULL)
 217                                 return (NULL);
 218                         flags |= FLAG_MONTH | FLAG_MDAY | FLAG_YEAR;
 219                         break;
 220
 221                 case 'j':
 222                         if (!isdigit_l((unsigned char)*buf, locale))
 223                                 return (NULL);
 224
 225                         len = 3;
 226                         for (i = 0; len && *buf != 0 &&
 227                              isdigit_l((unsigned char)*buf, locale); buf++){
 228                                 i *= 10;
 229                                 i += *buf - '0';
 230                                 len--;
 231                         }
 232                         if (i < 1 || i > 366)
 233                                 return (NULL);
 234
 235                         tm->tm_yday = i - 1;
 236                         flags |= FLAG_YDAY;
 237
 238                         break;
 239
 240                 case 'M':
 241                 case 'S':
 242                         if (*buf == 0 ||
 243                                 isspace_l((unsigned char)*buf, locale))
 244                                 break;
 245
 246                         if (!isdigit_l((unsigned char)*buf, locale))
 247                                 return (NULL);
 248
 249                         len = 2;
 250                         for (i = 0; len && *buf != 0 &&
 251                                 isdigit_l((unsigned char)*buf, locale); buf++){
 252                                 i *= 10;
 253                                 i += *buf - '0';
 254                                 len--;
 255                         }
 256
 257                         if (c == 'M') {
 258                                 if (i > 59)
 259                                         return (NULL);
 260                                 tm->tm_min = i;
 261                         } else {
 262                                 if (i > 60)
 263                                         return (NULL);
 264                                 tm->tm_sec = i;
 265                         }
 266
 267                         break;
 268
 269                 case 'H':
 270                 case 'I':
 271                 case 'k':
 272                 case 'l':
 273                         /*
 274                          * Of these, %l is the only specifier explicitly
 275                          * documented as not being zero-padded.  However,
 276                          * there is no harm in allowing zero-padding.
 277                          *
 278                          * XXX The %l specifier may gobble one too many
 279                          * digits if used incorrectly.
 280                          */
 281                         if (!isdigit_l((unsigned char)*buf, locale))
 282                                 return (NULL);
 283
 284                         len = 2;
 285                         for (i = 0; len && *buf != 0 &&
 286                              isdigit_l((unsigned char)*buf, locale); buf++) {
 287                                 i *= 10;
 288                                 i += *buf - '0';
 289                                 len--;
 290                         }
 291                         if (c == 'H' || c == 'k') {
 292                                 if (i > 23)
 293                                         return (NULL);
 294                         } else if (i > 12)
 295                                 return (NULL);
 296
 297                         tm->tm_hour = i;
 298
 299                         break;
 300
 301                 case 'p':
 302                         /*
 303                          * XXX This is bogus if parsed before hour-related
 304                          * specifiers.
 305                          */
 306                         if (tm->tm_hour > 12)
 307                                 return (NULL);
 308
 309                         len = strlen(tptr->am);
 310                         if (strncasecmp_l(buf, tptr->am, len, locale) == 0) {
 311                                 if (tm->tm_hour == 12)
 312                                         tm->tm_hour = 0;
 313                                 buf += len;
 314                                 break;
 315                         }
 316
 317                         len = strlen(tptr->pm);
 318                         if (strncasecmp_l(buf, tptr->pm, len, locale) == 0) {
 319                                 if (tm->tm_hour != 12)
 320                                         tm->tm_hour += 12;
 321                                 buf += len;
 322                                 break;
 323                         }
 324
 325                         return (NULL);
 326
 327                 case 'A':
 328                 case 'a':
 329                         for (i = 0; i < asizeof(tptr->weekday); i++) {
 330                                 len = strlen(tptr->weekday[i]);
 331                                 if (strncasecmp_l(buf, tptr->weekday[i],
 332                                                 len, locale) == 0)
 333                                         break;
 334                                 len = strlen(tptr->wday[i]);
 335                                 if (strncasecmp_l(buf, tptr->wday[i],
 336                                                 len, locale) == 0)
 337                                         break;
 338                         }
 339                         if (i == asizeof(tptr->weekday))
 340                                 return (NULL);
 341
 342                         buf += len;
 343                         tm->tm_wday = i;
 344                         flags |= FLAG_WDAY;
 345                         break;
 346
 347                 case 'U':
 348                 case 'W':
 349                         /*
 350                          * XXX This is bogus, as we can not assume any valid
 351                          * information present in the tm structure at this
 352                          * point to calculate a real value, so just check the
 353                          * range for now.
 354                          */
 355                         if (!isdigit_l((unsigned char)*buf, locale))
 356                                 return (NULL);
 357
 358                         len = 2;
 359                         for (i = 0; len && *buf != 0 &&
 360                              isdigit_l((unsigned char)*buf, locale); buf++) {
 361                                 i *= 10;
 362                                 i += *buf - '0';
 363                                 len--;
 364                         }
 365                         if (i > 53)
 366                                 return (NULL);
 367
 368                         if (c == 'U')
 369                                 day_offset = TM_SUNDAY;
 370                         else
 371                                 day_offset = TM_MONDAY;
 372
 373
 374                         week_offset = i;
 375
 376                         break;
 377
 378                 case 'u':
 379                 case 'w':
 380                         if (!isdigit_l((unsigned char)*buf, locale))
 381                                 return (NULL);
 382
 383                         i = *buf++ - '0';
 384                         if (i < 0 || i > 7 || (c == 'u' && i < 1) ||
 385                             (c == 'w' && i > 6))
 386                                 return (NULL);
 387
 388                         tm->tm_wday = i % 7;
 389                         flags |= FLAG_WDAY;
 390
 391                         break;
 392
 393                 case 'e':
 394                         /*
 395                          * With %e format, our strftime(3) adds a blank space
 396                          * before single digits.
 397                          */
 398                         if (*buf != 0 &&
 399                             isspace_l((unsigned char)*buf, locale))
 400                                buf++;
 401                         /* FALLTHROUGH */
 402                 case 'd':
 403                         /*
 404                          * The %e specifier was once explicitly documented as
 405                          * not being zero-padded but was later changed to
 406                          * equivalent to %d.  There is no harm in allowing
 407                          * such padding.
 408                          *
 409                          * XXX The %e specifier may gobble one too many
 410                          * digits if used incorrectly.
 411                          */
 412                         if (!isdigit_l((unsigned char)*buf, locale))
 413                                 return (NULL);
 414
 415                         len = 2;
 416                         for (i = 0; len && *buf != 0 &&
 417                              isdigit_l((unsigned char)*buf, locale); buf++) {
 418                                 i *= 10;
 419                                 i += *buf - '0';
 420                                 len--;
 421                         }
 422                         if (i > 31)
 423                                 return (NULL);
 424
 425                         tm->tm_mday = i;
 426                         flags |= FLAG_MDAY;
 427
 428                         break;
 429
 430                 case 'B':
 431                 case 'b':
 432                 case 'h':
 433                         for (i = 0; i < asizeof(tptr->month); i++) {
 434                                 if (Oalternative) {
 435                                         if (c == 'B') {
 436                                                 len = strlen(tptr->alt_month[i]);
 437                                                 if (strncasecmp_l(buf,
 438                                                                 tptr->alt_month[i],
 439                                                                 len, locale) == 0)
 440                                                         break;
 441                                         }
 442                                 } else {
 443                                         len = strlen(tptr->month[i]);
 444                                         if (strncasecmp_l(buf, tptr->month[i],
 445                                                         len, locale) == 0)
 446                                                 break;
 447                                 }
 448                         }
 449                         /*
 450                          * Try the abbreviated month name if the full name
 451                          * wasn't found and Oalternative was not requested.
 452                          */
 453                         if (i == asizeof(tptr->month) && !Oalternative) {
 454                                 for (i = 0; i < asizeof(tptr->month); i++) {
 455                                         len = strlen(tptr->mon[i]);
 456                                         if (strncasecmp_l(buf, tptr->mon[i],
 457                                                         len, locale) == 0)
 458                                                 break;
 459                                 }
 460                         }
 461                         if (i == asizeof(tptr->month))
 462                                 return (NULL);
 463
 464                         tm->tm_mon = i;
 465                         buf += len;
 466                         flags |= FLAG_MONTH;
 467
 468                         break;
 469
 470                 case 'm':
 471                         if (!isdigit_l((unsigned char)*buf, locale))
 472                                 return (NULL);
 473
 474                         len = 2;
 475                         for (i = 0; len && *buf != 0 &&
 476                              isdigit_l((unsigned char)*buf, locale); buf++) {
 477                                 i *= 10;
 478                                 i += *buf - '0';
 479                                 len--;
 480                         }
 481                         if (i < 1 || i > 12)
 482                                 return (NULL);
 483
 484                         tm->tm_mon = i - 1;
 485                         flags |= FLAG_MONTH;
 486
 487                         break;
 488
 489                 case 's':
 490                         {
 491                         char *cp;
 492                         int sverrno;
 493                         long n;
 494                         time_t t;
 495
 496                         sverrno = errno;
 497                         errno = 0;
 498                         n = strtol_l(buf, &cp, 10, locale);
 499                         if (errno == ERANGE || (long)(t = n) != n) {
 500                                 errno = sverrno;
 501                                 return (NULL);
 502                         }
 503                         errno = sverrno;
 504                         buf = cp;
 505                         if (gmtime_r(&t, tm) == NULL)
 506                                 return (NULL);
 507                         *GMTp = 1;
 508                         flags |= FLAG_YDAY | FLAG_WDAY | FLAG_MONTH |
 509                             FLAG_MDAY | FLAG_YEAR;
 510                         }
 511                         break;
 512
 513                 case 'Y':
 514                 case 'y':
 515                         if (*buf == 0 ||
 516                             isspace_l((unsigned char)*buf, locale))
 517                                 break;
 518
 519                         if (!isdigit_l((unsigned char)*buf, locale))
 520                                 return (NULL);
 521
 522                         len = (c == 'Y') ? 4 : 2;
 523                         for (i = 0; len && *buf != 0 &&
 524                              isdigit_l((unsigned char)*buf, locale); buf++) {
 525                                 i *= 10;
 526                                 i += *buf - '0';
 527                                 len--;
 528                         }
 529                         if (c == 'Y')
 530                                 i -= TM_YEAR_BASE;
 531                         if (c == 'y' && i < 69)
 532                                 i += 100;
 533                         if (i < 0)
 534                                 return (NULL);
 535
 536                         tm->tm_year = i;
 537                         flags |= FLAG_YEAR;
 538
 539                         break;
 540
 541                 case 'Z':
 542                         {
 543                         const char *cp;
 544                         char *zonestr;
 545
 546                         for (cp = buf; *cp &&
 547                              isupper_l((unsigned char)*cp, locale); ++cp) {
 548                                 /*empty*/}
 549                         if (cp - buf) {
 550                                 zonestr = alloca(cp - buf + 1);
 551                                 strncpy(zonestr, buf, cp - buf);
 552                                 zonestr[cp - buf] = '\0';
 553                                 tzset();
 554                                 if (0 == strcmp(zonestr, "GMT") ||
 555                                     0 == strcmp(zonestr, "UTC")) {
 556                                     *GMTp = 1;
 557                                 } else if (0 == strcmp(zonestr, tzname[0])) {
 558                                     tm->tm_isdst = 0;
 559                                 } else if (0 == strcmp(zonestr, tzname[1])) {
 560                                     tm->tm_isdst = 1;
 561                                 } else {
 562                                     return (NULL);
 563                                 }
 564                                 buf += cp - buf;
 565                         }
 566                         }
 567                         break;
 568
 569                 case 'z':
 570                         {
 571                         int sign = 1;
 572
 573                         if (*buf != '+') {
 574                                 if (*buf == '-')
 575                                         sign = -1;
 576                                 else
 577                                         return (NULL);
 578                         }
 579
 580                         buf++;
 581                         i = 0;
 582                         for (len = 4; len > 0; len--) {
 583                                 if (isdigit_l((unsigned char)*buf, locale)) {
 584                                         i *= 10;
 585                                         i += *buf - '0';
 586                                         buf++;
 587                                 } else if (len == 2) {
 588                                         i *= 100;
 589                                         break;
 590                                 } else
 591                                         return (NULL);
 592                         }
 593
 594                         if (i > 1400 || (sign == -1 && i > 1200) ||
 595                             (i % 100) >= 60)
 596                                 return (NULL);
 597                         tm->tm_hour -= sign * (i / 100);
 598                         tm->tm_min  -= sign * (i % 100);
 599                         *GMTp = 1;
 600                         }
 601                         break;
 602
 603                 case 'n':
 604                 case 't':
 605                         while (isspace_l((unsigned char)*buf, locale))
 606                                 buf++;
 607                         break;
 608
 609                 default:
 610                         return (NULL);
 611                 }
 612         }
 613
 614         if (!(flags & FLAG_YDAY) && (flags & FLAG_YEAR)) {
 615                 if ((flags & (FLAG_MONTH | FLAG_MDAY)) ==
 616                     (FLAG_MONTH | FLAG_MDAY)) {
 617                         tm->tm_yday = start_of_month[isleap(tm->tm_year +
 618                             TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
 619                         flags |= FLAG_YDAY;
 620                 } else if (day_offset != -1) {
 621                         int tmpwday, tmpyday, fwo;
 622
 623                         fwo = first_wday_of(tm->tm_year + TM_YEAR_BASE);
 624                         /* No incomplete week (week 0). */
 625                         if (week_offset == 0 && fwo == day_offset)
 626                                 return (NULL);
 627
 628                         /* Set the date to the first Sunday (or Monday)
 629                          * of the specified week of the year.
 630                          */
 631                         tmpwday = (flags & FLAG_WDAY) ? tm->tm_wday :
 632                             day_offset;
 633                         tmpyday = (7 - fwo + day_offset) % 7 +
 634                             (week_offset - 1) * 7 +
 635                             (tmpwday - day_offset + 7) % 7;
 636                         /* Impossible yday for incomplete week (week 0). */
 637                         if (tmpyday < 0) {
 638                                 if (flags & FLAG_WDAY)
 639                                         return (NULL);
 640                                 tmpyday = 0;
 641                         }
 642                         tm->tm_yday = tmpyday;
 643                         flags |= FLAG_YDAY;
 644                 }
 645         }
 646
 647         if ((flags & (FLAG_YEAR | FLAG_YDAY)) == (FLAG_YEAR | FLAG_YDAY)) {
 648                 if (!(flags & FLAG_MONTH)) {
 649                         i = 0;
 650                         while (tm->tm_yday >=
 651                             start_of_month[isleap(tm->tm_year +
 652                             TM_YEAR_BASE)][i])
 653                                 i++;
 654                         if (i > 12) {
 655                                 i = 1;
 656                                 tm->tm_yday -=
 657                                     start_of_month[isleap(tm->tm_year +
 658                                     TM_YEAR_BASE)][12];
 659                                 tm->tm_year++;
 660                         }
 661                         tm->tm_mon = i - 1;
 662                         flags |= FLAG_MONTH;
 663                 }
 664                 if (!(flags & FLAG_MDAY)) {
 665                         tm->tm_mday = tm->tm_yday -
 666                             start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)]
 667                             [tm->tm_mon] + 1;
 668                         flags |= FLAG_MDAY;
 669                 }
 670                 if (!(flags & FLAG_WDAY)) {
 671                         i = 0;
 672                         wday_offset = first_wday_of(tm->tm_year);
 673                         while (i++ <= tm->tm_yday) {
 674                                 if (wday_offset++ >= 6)
 675                                         wday_offset = 0;
 676                         }
 677                         tm->tm_wday = wday_offset;
 678                         flags |= FLAG_WDAY;
 679                 }
 680         }
 681
 682         return ((char *)buf);
 683 }
 684
 685 char *
 686 strptime_l(const char * __restrict buf, const char * __restrict fmt,
 687     struct tm * __restrict tm, locale_t loc)
 688 {
 689         char *ret;
 690         int gmt;
 691         FIX_LOCALE(loc);
 692
 693         gmt = 0;
 694         ret = _strptime(buf, fmt, tm, &gmt, loc);
 695         if (ret && gmt) {
 696                 time_t t = timegm(tm);
 697
 698                 localtime_r(&t, tm);
 699         }
 700
 701         return (ret);
 702 }
 703
 704 char *
 705 strptime(const char * __restrict buf, const char * __restrict fmt,
 706     struct tm * __restrict tm)
 707 {
 708         return strptime_l(buf, fmt, tm, __get_locale());
 709 }