git.pond.sub.org Git - empserver/blob - src/lib/w32/strptime.c

   1 /*
   2  * Ported from NetBSD to Windows by Ron Koenderink, 2007
   3  * Port rebased by Markus Armbruster, 2009
   4  */
   5
   6 #include "w32misc.h"
   7 #ifdef _MSC_VER
   8 #define tzname _tzname
   9 #endif
  10
  11 typedef unsigned char u_char;
  12 typedef unsigned int uint;
  13
  14 typedef struct {
  15         const char *abday[7];
  16         const char *day[7];
  17         const char *abmon[12];
  18         const char *mon[12];
  19         const char *am_pm[2];
  20         const char *d_t_fmt;
  21         const char *d_fmt;
  22         const char *t_fmt;
  23         const char *t_fmt_ampm;
  24 } TimeLocale;
  25
  26 static const TimeLocale DefaultTimeLocale =
  27 {
  28         {
  29                 "Sun","Mon","Tue","Wed","Thu","Fri","Sat",
  30         },
  31         {
  32                 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
  33                 "Friday", "Saturday"
  34         },
  35         {
  36                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  37                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  38         },
  39         {
  40                 "January", "February", "March", "April", "May", "June", "July",
  41                 "August", "September", "October", "November", "December"
  42         },
  43         {
  44                 "AM", "PM"
  45         },
  46         "%a %b %e %H:%M:%S %Y",
  47         "%m/%d/%y",
  48         "%H:%M:%S",
  49         "%I:%M:%S %p"
  50 };
  51
  52 #define _CurrentTimeLocale (&DefaultTimeLocale)
  53 #define TM_YEAR_BASE 1900
  54 #define __UNCONST(a) ((void *)(a))
  55
  56 /*      $NetBSD: strptime.c,v 1.28 2008/04/28 20:23:01 martin Exp $     */
  57
  58 /*-
  59  * Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
  60  * All rights reserved.
  61  *
  62  * This code was contributed to The NetBSD Foundation by Klaus Klein.
  63  * Heavily optimised by David Laight
  64  *
  65  * Redistribution and use in source and binary forms, with or without
  66  * modification, are permitted provided that the following conditions
  67  * are met:
  68  * 1. Redistributions of source code must retain the above copyright
  69  *    notice, this list of conditions and the following disclaimer.
  70  * 2. Redistributions in binary form must reproduce the above copyright
  71  *    notice, this list of conditions and the following disclaimer in the
  72  *    documentation and/or other materials provided with the distribution.
  73  *
  74  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  75  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  76  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  77  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  78  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  79  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  80  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  81  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  82  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  83  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  84  * POSSIBILITY OF SUCH DAMAGE.
  85  */
  86
  87 #if 0
  88 #include <sys/cdefs.h>
  89 #if defined(LIBC_SCCS) && !defined(lint)
  90 __RCSID("$NetBSD: strptime.c,v 1.28 2008/04/28 20:23:01 martin Exp $");
  91 #endif
  92
  93 #include "namespace.h"
  94 #include <sys/localedef.h>
  95 #endif
  96 #include <ctype.h>
  97 #include <locale.h>
  98 #include <string.h>
  99 #include <time.h>
 100 #if 0
 101 #include <tzfile.h>
 102
 103 #ifdef __weak_alias
 104 __weak_alias(strptime,_strptime)
 105 #endif
 106 #endif
 107
 108 #define _ctloc(x)               (_CurrentTimeLocale->x)
 109
 110 /*
 111  * We do not implement alternate representations. However, we always
 112  * check whether a given modifier is allowed for a certain conversion.
 113  */
 114 #define ALT_E                   0x01
 115 #define ALT_O                   0x02
 116 #define LEGAL_ALT(x)            { if (alt_format & ~(x)) return NULL; }
 117
 118 static const char gmt[4] = { "GMT" };
 119
 120 static const u_char *conv_num(const unsigned char *, int *, uint, uint);
 121 static const u_char *find_string(const u_char *, int *, const char * const *,
 122         const char * const *, int);
 123
 124
 125 char *
 126 strptime(const char *buf, const char *fmt, struct tm *tm)
 127 {
 128         unsigned char c;
 129         const unsigned char *bp;
 130         int alt_format, i, split_year = 0;
 131         const char *new_fmt;
 132
 133         bp = (const u_char *)buf;
 134
 135         while (bp != NULL && (c = *fmt++) != '\0') {
 136                 /* Clear `alternate' modifier prior to new conversion. */
 137                 alt_format = 0;
 138                 i = 0;
 139
 140                 /* Eat up white-space. */
 141                 if (isspace(c)) {
 142                         while (isspace(*bp))
 143                                 bp++;
 144                         continue;
 145                 }
 146
 147                 if (c != '%')
 148                         goto literal;
 149
 150
 151 again:          switch (c = *fmt++) {
 152                 case '%':       /* "%%" is converted to "%". */
 153 literal:
 154                         if (c != *bp++)
 155                                 return NULL;
 156                         LEGAL_ALT(0);
 157                         continue;
 158
 159                 /*
 160                  * "Alternative" modifiers. Just set the appropriate flag
 161                  * and start over again.
 162                  */
 163                 case 'E':       /* "%E?" alternative conversion modifier. */
 164                         LEGAL_ALT(0);
 165                         alt_format |= ALT_E;
 166                         goto again;
 167
 168                 case 'O':       /* "%O?" alternative conversion modifier. */
 169                         LEGAL_ALT(0);
 170                         alt_format |= ALT_O;
 171                         goto again;
 172
 173                 /*
 174                  * "Complex" conversion rules, implemented through recursion.
 175                  */
 176                 case 'c':       /* Date and time, using the locale's format. */
 177                         new_fmt = _ctloc(d_t_fmt);
 178                         goto recurse;
 179
 180                 case 'D':       /* The date as "%m/%d/%y". */
 181                         new_fmt = "%m/%d/%y";
 182                         LEGAL_ALT(0);
 183                         goto recurse;
 184
 185                 case 'F':       /* The date as "%Y-%m-%d". */
 186                         new_fmt = "%Y-%m-%d";
 187                         LEGAL_ALT(0);
 188                         goto recurse;
 189
 190                 case 'R':       /* The time as "%H:%M". */
 191                         new_fmt = "%H:%M";
 192                         LEGAL_ALT(0);
 193                         goto recurse;
 194
 195                 case 'r':       /* The time in 12-hour clock representation. */
 196                         new_fmt =_ctloc(t_fmt_ampm);
 197                         LEGAL_ALT(0);
 198                         goto recurse;
 199
 200                 case 'T':       /* The time as "%H:%M:%S". */
 201                         new_fmt = "%H:%M:%S";
 202                         LEGAL_ALT(0);
 203                         goto recurse;
 204
 205                 case 'X':       /* The time, using the locale's format. */
 206                         new_fmt =_ctloc(t_fmt);
 207                         goto recurse;
 208
 209                 case 'x':       /* The date, using the locale's format. */
 210                         new_fmt =_ctloc(d_fmt);
 211                     recurse:
 212                         bp = (const u_char *)strptime((const char *)bp,
 213                                                             new_fmt, tm);
 214                         LEGAL_ALT(ALT_E);
 215                         continue;
 216
 217                 /*
 218                  * "Elementary" conversion rules.
 219                  */
 220                 case 'A':       /* The day of week, using the locale's form. */
 221                 case 'a':
 222                         bp = find_string(bp, &tm->tm_wday, _ctloc(day),
 223                                         _ctloc(abday), 7);
 224                         LEGAL_ALT(0);
 225                         continue;
 226
 227                 case 'B':       /* The month, using the locale's form. */
 228                 case 'b':
 229                 case 'h':
 230                         bp = find_string(bp, &tm->tm_mon, _ctloc(mon),
 231                                         _ctloc(abmon), 12);
 232                         LEGAL_ALT(0);
 233                         continue;
 234
 235                 case 'C':       /* The century number. */
 236                         i = 20;
 237                         bp = conv_num(bp, &i, 0, 99);
 238
 239                         i = i * 100 - TM_YEAR_BASE;
 240                         if (split_year)
 241                                 i += tm->tm_year % 100;
 242                         split_year = 1;
 243                         tm->tm_year = i;
 244                         LEGAL_ALT(ALT_E);
 245                         continue;
 246
 247                 case 'd':       /* The day of month. */
 248                 case 'e':
 249                         bp = conv_num(bp, &tm->tm_mday, 1, 31);
 250                         LEGAL_ALT(ALT_O);
 251                         continue;
 252
 253                 case 'k':       /* The hour (24-hour clock representation). */
 254                         LEGAL_ALT(0);
 255                         /* FALLTHROUGH */
 256                 case 'H':
 257                         bp = conv_num(bp, &tm->tm_hour, 0, 23);
 258                         LEGAL_ALT(ALT_O);
 259                         continue;
 260
 261                 case 'l':       /* The hour (12-hour clock representation). */
 262                         LEGAL_ALT(0);
 263                         /* FALLTHROUGH */
 264                 case 'I':
 265                         bp = conv_num(bp, &tm->tm_hour, 1, 12);
 266                         if (tm->tm_hour == 12)
 267                                 tm->tm_hour = 0;
 268                         LEGAL_ALT(ALT_O);
 269                         continue;
 270
 271                 case 'j':       /* The day of year. */
 272                         i = 1;
 273                         bp = conv_num(bp, &i, 1, 366);
 274                         tm->tm_yday = i - 1;
 275                         LEGAL_ALT(0);
 276                         continue;
 277
 278                 case 'M':       /* The minute. */
 279                         bp = conv_num(bp, &tm->tm_min, 0, 59);
 280                         LEGAL_ALT(ALT_O);
 281                         continue;
 282
 283                 case 'm':       /* The month. */
 284                         i = 1;
 285                         bp = conv_num(bp, &i, 1, 12);
 286                         tm->tm_mon = i - 1;
 287                         LEGAL_ALT(ALT_O);
 288                         continue;
 289
 290                 case 'p':       /* The locale's equivalent of AM/PM. */
 291                         bp = find_string(bp, &i, _ctloc(am_pm), NULL, 2);
 292                         if (tm->tm_hour > 11)
 293                                 return NULL;
 294                         tm->tm_hour += i * 12;
 295                         LEGAL_ALT(0);
 296                         continue;
 297
 298                 case 'S':       /* The seconds. */
 299                         bp = conv_num(bp, &tm->tm_sec, 0, 61);
 300                         LEGAL_ALT(ALT_O);
 301                         continue;
 302
 303                 case 'U':       /* The week of year, beginning on sunday. */
 304                 case 'W':       /* The week of year, beginning on monday. */
 305                         /*
 306                          * XXX This is bogus, as we can not assume any valid
 307                          * information present in the tm structure at this
 308                          * point to calculate a real value, so just check the
 309                          * range for now.
 310                          */
 311                          bp = conv_num(bp, &i, 0, 53);
 312                          LEGAL_ALT(ALT_O);
 313                          continue;
 314
 315                 case 'w':       /* The day of week, beginning on sunday. */
 316                         bp = conv_num(bp, &tm->tm_wday, 0, 6);
 317                         LEGAL_ALT(ALT_O);
 318                         continue;
 319
 320                 case 'Y':       /* The year. */
 321                         i = TM_YEAR_BASE;       /* just for data sanity... */
 322                         bp = conv_num(bp, &i, 0, 9999);
 323                         tm->tm_year = i - TM_YEAR_BASE;
 324                         LEGAL_ALT(ALT_E);
 325                         continue;
 326
 327                 case 'y':       /* The year within 100 years of the epoch. */
 328                         /* LEGAL_ALT(ALT_E | ALT_O); */
 329                         bp = conv_num(bp, &i, 0, 99);
 330
 331                         if (split_year)
 332                                 /* preserve century */
 333                                 i += (tm->tm_year / 100) * 100;
 334                         else {
 335                                 split_year = 1;
 336                                 if (i <= 68)
 337                                         i = i + 2000 - TM_YEAR_BASE;
 338                                 else
 339                                         i = i + 1900 - TM_YEAR_BASE;
 340                         }
 341                         tm->tm_year = i;
 342                         continue;
 343
 344                 case 'Z':
 345                         tzset();
 346                         if (strncmp((const char *)bp, gmt, 3) == 0) {
 347                                 tm->tm_isdst = 0;
 348 #ifdef TM_GMTOFF
 349                                 tm->TM_GMTOFF = 0;
 350 #endif
 351 #ifdef TM_ZONE
 352                                 tm->TM_ZONE = gmt;
 353 #endif
 354                                 bp += 3;
 355                         } else {
 356                                 const unsigned char *ep;
 357
 358                                 ep = find_string(bp, &i,
 359                                                  (const char * const *)tzname,
 360                                                   NULL, 2);
 361                                 if (ep != NULL) {
 362                                         tm->tm_isdst = i;
 363 #ifdef TM_GMTOFF
 364                                         tm->TM_GMTOFF = -(timezone);
 365 #endif
 366 #ifdef TM_ZONE
 367                                         tm->TM_ZONE = tzname[i];
 368 #endif
 369                                 }
 370                                 bp = ep;
 371                         }
 372                         continue;
 373
 374                 /*
 375                  * Miscellaneous conversions.
 376                  */
 377                 case 'n':       /* Any kind of white-space. */
 378                 case 't':
 379                         while (isspace(*bp))
 380                                 bp++;
 381                         LEGAL_ALT(0);
 382                         continue;
 383
 384
 385                 default:        /* Unknown/unsupported conversion. */
 386                         return NULL;
 387                 }
 388         }
 389
 390         return __UNCONST(bp);
 391 }
 392
 393
 394 static const u_char *
 395 conv_num(const unsigned char *buf, int *dest, uint llim, uint ulim)
 396 {
 397         uint result = 0;
 398         unsigned char ch;
 399
 400         /* The limit also determines the number of valid digits. */
 401         uint rulim = ulim;
 402
 403         ch = *buf;
 404         if (ch < '0' || ch > '9')
 405                 return NULL;
 406
 407         do {
 408                 result *= 10;
 409                 result += ch - '0';
 410                 rulim /= 10;
 411                 ch = *++buf;
 412         } while ((result * 10 <= ulim) && rulim && ch >= '0' && ch <= '9');
 413
 414         if (result < llim || result > ulim)
 415                 return NULL;
 416
 417         *dest = result;
 418         return buf;
 419 }
 420
 421 static const u_char *
 422 find_string(const u_char *bp, int *tgt, const char * const *n1,
 423                 const char * const *n2, int c)
 424 {
 425         int i;
 426         unsigned int len;
 427
 428         /* check full name - then abbreviated ones */
 429         for (; n1 != NULL; n1 = n2, n2 = NULL) {
 430                 for (i = 0; i < c; i++, n1++) {
 431                         len = strlen(*n1);
 432                         if (strncasecmp(*n1, (const char *)bp, len) == 0) {
 433                                 *tgt = i;
 434                                 return bp + len;
 435                         }
 436                 }
 437         }
 438
 439         /* Nothing matched */
 440         return NULL;
 441 }