CMakeLua/Utilities/cmcurl-7.19.0/lib/parsedate.c

   1 /***************************************************************************
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   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  * $Id: parsedate.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
  22  ***************************************************************************/
  23 /*
  24   A brief summary of the date string formats this parser groks:
  25
  26   RFC 2616 3.3.1
  27
  28   Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 822, updated by RFC 1123
  29   Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
  30   Sun Nov  6 08:49:37 1994       ; ANSI C's asctime() format
  31
  32   we support dates without week day name:
  33
  34   06 Nov 1994 08:49:37 GMT
  35   06-Nov-94 08:49:37 GMT
  36   Nov  6 08:49:37 1994
  37
  38   without the time zone:
  39
  40   06 Nov 1994 08:49:37
  41   06-Nov-94 08:49:37
  42
  43   weird order:
  44
  45   1994 Nov 6 08:49:37  (GNU date fails)
  46   GMT 08:49:37 06-Nov-94 Sunday
  47   94 6 Nov 08:49:37    (GNU date fails)
  48
  49   time left out:
  50
  51   1994 Nov 6
  52   06-Nov-94
  53   Sun Nov 6 94
  54
  55   unusual separators:
  56
  57   1994.Nov.6
  58   Sun/Nov/6/94/GMT
  59
  60   commonly used time zone names:
  61
  62   Sun, 06 Nov 1994 08:49:37 CET
  63   06 Nov 1994 08:49:37 EST
  64
  65   time zones specified using RFC822 style:
  66
  67   Sun, 12 Sep 2004 15:05:58 -0700
  68   Sat, 11 Sep 2004 21:32:11 +0200
  69
  70   compact numerical date strings:
  71
  72   20040912 15:05:58 -0700
  73   20040911 +0200
  74
  75 */
  76 #include "setup.h"
  77 #include <stdio.h>
  78 #include <ctype.h>
  79 #include <string.h>
  80
  81 #ifdef HAVE_STDLIB_H
  82 #include <stdlib.h> /* for strtol() */
  83 #endif
  84
  85 #include <curl/curl.h>
  86
  87 const char * const Curl_wkday[] =
  88 {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
  89 static const char * const weekday[] =
  90 { "Monday", "Tuesday", "Wednesday", "Thursday",
  91   "Friday", "Saturday", "Sunday" };
  92 const char * const Curl_month[]=
  93 { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  94   "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
  95
  96 struct tzinfo {
  97   const char *name;
  98   int offset; /* +/- in minutes */
  99 };
 100
 101 /* Here's a bunch of frequently used time zone names. These were supported
 102    by the old getdate parser. */
 103 #define tDAYZONE -60       /* offset for daylight savings time */
 104 static const struct tzinfo tz[]= {
 105   {"GMT", 0},              /* Greenwich Mean */
 106   {"UTC", 0},              /* Universal (Coordinated) */
 107   {"WET", 0},              /* Western European */
 108   {"BST", 0 tDAYZONE},     /* British Summer */
 109   {"WAT", 60},             /* West Africa */
 110   {"AST", 240},            /* Atlantic Standard */
 111   {"ADT", 240 tDAYZONE},   /* Atlantic Daylight */
 112   {"EST", 300},            /* Eastern Standard */
 113   {"EDT", 300 tDAYZONE},   /* Eastern Daylight */
 114   {"CST", 360},            /* Central Standard */
 115   {"CDT", 360 tDAYZONE},   /* Central Daylight */
 116   {"MST", 420},            /* Mountain Standard */
 117   {"MDT", 420 tDAYZONE},   /* Mountain Daylight */
 118   {"PST", 480},            /* Pacific Standard */
 119   {"PDT", 480 tDAYZONE},   /* Pacific Daylight */
 120   {"YST", 540},            /* Yukon Standard */
 121   {"YDT", 540 tDAYZONE},   /* Yukon Daylight */
 122   {"HST", 600},            /* Hawaii Standard */
 123   {"HDT", 600 tDAYZONE},   /* Hawaii Daylight */
 124   {"CAT", 600},            /* Central Alaska */
 125   {"AHST", 600},           /* Alaska-Hawaii Standard */
 126   {"NT",  660},            /* Nome */
 127   {"IDLW", 720},           /* International Date Line West */
 128   {"CET", -60},            /* Central European */
 129   {"MET", -60},            /* Middle European */
 130   {"MEWT", -60},           /* Middle European Winter */
 131   {"MEST", -60 tDAYZONE},  /* Middle European Summer */
 132   {"CEST", -60 tDAYZONE},  /* Central European Summer */
 133   {"MESZ", -60 tDAYZONE},  /* Middle European Summer */
 134   {"FWT", -60},            /* French Winter */
 135   {"FST", -60 tDAYZONE},   /* French Summer */
 136   {"EET", -120},           /* Eastern Europe, USSR Zone 1 */
 137   {"WAST", -420},          /* West Australian Standard */
 138   {"WADT", -420 tDAYZONE}, /* West Australian Daylight */
 139   {"CCT", -480},           /* China Coast, USSR Zone 7 */
 140   {"JST", -540},           /* Japan Standard, USSR Zone 8 */
 141   {"EAST", -600},          /* Eastern Australian Standard */
 142   {"EADT", -600 tDAYZONE}, /* Eastern Australian Daylight */
 143   {"GST", -600},           /* Guam Standard, USSR Zone 9 */
 144   {"NZT", -720},           /* New Zealand */
 145   {"NZST", -720},          /* New Zealand Standard */
 146   {"NZDT", -720 tDAYZONE}, /* New Zealand Daylight */
 147   {"IDLE", -720},          /* International Date Line East */
 148 };
 149
 150 /* returns:
 151    -1 no day
 152    0 monday - 6 sunday
 153 */
 154
 155 static int checkday(const char *check, size_t len)
 156 {
 157   int i;
 158   const char * const *what;
 159   bool found= FALSE;
 160   if(len > 3)
 161     what = &weekday[0];
 162   else
 163     what = &Curl_wkday[0];
 164   for(i=0; i<7; i++) {
 165     if(curl_strequal(check, what[0])) {
 166       found=TRUE;
 167       break;
 168     }
 169     what++;
 170   }
 171   return found?i:-1;
 172 }
 173
 174 static int checkmonth(const char *check)
 175 {
 176   int i;
 177   const char * const *what;
 178   bool found= FALSE;
 179
 180   what = &Curl_month[0];
 181   for(i=0; i<12; i++) {
 182     if(curl_strequal(check, what[0])) {
 183       found=TRUE;
 184       break;
 185     }
 186     what++;
 187   }
 188   return found?i:-1; /* return the offset or -1, no real offset is -1 */
 189 }
 190
 191 /* return the time zone offset between GMT and the input one, in number
 192    of seconds or -1 if the timezone wasn't found/legal */
 193
 194 static int checktz(const char *check)
 195 {
 196   unsigned int i;
 197   const struct tzinfo *what;
 198   bool found= FALSE;
 199
 200   what = tz;
 201   for(i=0; i< sizeof(tz)/sizeof(tz[0]); i++) {
 202     if(curl_strequal(check, what->name)) {
 203       found=TRUE;
 204       break;
 205     }
 206     what++;
 207   }
 208   return found?what->offset*60:-1;
 209 }
 210
 211 static void skip(const char **date)
 212 {
 213   /* skip everything that aren't letters or digits */
 214   while(**date && !ISALNUM(**date))
 215     (*date)++;
 216 }
 217
 218 enum assume {
 219   DATE_MDAY,
 220   DATE_YEAR,
 221   DATE_TIME
 222 };
 223
 224 static time_t parsedate(const char *date)
 225 {
 226   time_t t = 0;
 227   int wdaynum=-1;  /* day of the week number, 0-6 (mon-sun) */
 228   int monnum=-1;   /* month of the year number, 0-11 */
 229   int mdaynum=-1; /* day of month, 1 - 31 */
 230   int hournum=-1;
 231   int minnum=-1;
 232   int secnum=-1;
 233   int yearnum=-1;
 234   int tzoff=-1;
 235   struct tm tm;
 236   enum assume dignext = DATE_MDAY;
 237   const char *indate = date; /* save the original pointer */
 238   int part = 0; /* max 6 parts */
 239
 240   while(*date && (part < 6)) {
 241     bool found=FALSE;
 242
 243     skip(&date);
 244
 245     if(ISALPHA(*date)) {
 246       /* a name coming up */
 247       char buf[32]="";
 248       size_t len;
 249       sscanf(date, "%31[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz]", buf);
 250       len = strlen(buf);
 251
 252       if(wdaynum == -1) {
 253         wdaynum = checkday(buf, len);
 254         if(wdaynum != -1)
 255           found = TRUE;
 256       }
 257       if(!found && (monnum == -1)) {
 258         monnum = checkmonth(buf);
 259         if(monnum != -1)
 260           found = TRUE;
 261       }
 262
 263       if(!found && (tzoff == -1)) {
 264         /* this just must be a time zone string */
 265         tzoff = checktz(buf);
 266         if(tzoff != -1)
 267           found = TRUE;
 268       }
 269
 270       if(!found)
 271         return -1; /* bad string */
 272
 273       date += len;
 274     }
 275     else if(ISDIGIT(*date)) {
 276       /* a digit */
 277       int val;
 278       char *end;
 279       if((secnum == -1) &&
 280          (3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) {
 281         /* time stamp! */
 282         date += 8;
 283         found = TRUE;
 284       }
 285       else {
 286         val = (int)strtol(date, &end, 10);
 287
 288         if((tzoff == -1) &&
 289            ((end - date) == 4) &&
 290            (val <= 1400) &&
 291            (indate< date) &&
 292            ((date[-1] == '+' || date[-1] == '-'))) {
 293           /* four digits and a value less than or equal to 1400 (to take into
 294              account all sorts of funny time zone diffs) and it is preceeded
 295              with a plus or minus. This is a time zone indication.  1400 is
 296              picked since +1300 is frequently used and +1400 is mentioned as
 297              an edge number in the document "ISO C 200X Proposal: Timezone
 298              Functions" at http://david.tribble.com/text/c0xtimezone.html If
 299              anyone has a more authoritative source for the exact maximum time
 300              zone offsets, please speak up! */
 301           found = TRUE;
 302           tzoff = (val/100 * 60 + val%100)*60;
 303
 304           /* the + and - prefix indicates the local time compared to GMT,
 305              this we need ther reversed math to get what we want */
 306           tzoff = date[-1]=='+'?-tzoff:tzoff;
 307         }
 308
 309         if(((end - date) == 8) &&
 310            (yearnum == -1) &&
 311            (monnum == -1) &&
 312            (mdaynum == -1)) {
 313           /* 8 digits, no year, month or day yet. This is YYYYMMDD */
 314           found = TRUE;
 315           yearnum = val/10000;
 316           monnum = (val%10000)/100-1; /* month is 0 - 11 */
 317           mdaynum = val%100;
 318         }
 319
 320         if(!found && (dignext == DATE_MDAY) && (mdaynum == -1)) {
 321           if((val > 0) && (val<32)) {
 322             mdaynum = val;
 323             found = TRUE;
 324           }
 325           dignext = DATE_YEAR;
 326         }
 327
 328         if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
 329           yearnum = val;
 330           found = TRUE;
 331           if(yearnum < 1900) {
 332             if(yearnum > 70)
 333               yearnum += 1900;
 334             else
 335               yearnum += 2000;
 336           }
 337           if(mdaynum == -1)
 338             dignext = DATE_MDAY;
 339         }
 340
 341         if(!found)
 342           return -1;
 343
 344         date = end;
 345       }
 346     }
 347
 348     part++;
 349   }
 350
 351   if(-1 == secnum)
 352     secnum = minnum = hournum = 0; /* no time, make it zero */
 353
 354   if((-1 == mdaynum) ||
 355      (-1 == monnum) ||
 356      (-1 == yearnum))
 357     /* lacks vital info, fail */
 358     return -1;
 359
 360 #if SIZEOF_TIME_T < 5
 361   /* 32 bit time_t can only hold dates to the beginning of 2038 */
 362   if(yearnum > 2037)
 363     return 0x7fffffff;
 364 #endif
 365
 366   tm.tm_sec = secnum;
 367   tm.tm_min = minnum;
 368   tm.tm_hour = hournum;
 369   tm.tm_mday = mdaynum;
 370   tm.tm_mon = monnum;
 371   tm.tm_year = yearnum - 1900;
 372   tm.tm_wday = 0;
 373   tm.tm_yday = 0;
 374   tm.tm_isdst = 0;
 375
 376   /* mktime() returns a time_t. time_t is often 32 bits, even on many
 377      architectures that feature 64 bit 'long'.
 378
 379      Some systems have 64 bit time_t and deal with years beyond 2038. However,
 380      even some of the systems with 64 bit time_t returns -1 for dates beyond
 381      03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06)
 382   */
 383   t = mktime(&tm);
 384
 385   /* time zone adjust (cast t to int to compare to negative one) */
 386   if(-1 != (int)t) {
 387     struct tm *gmt;
 388     long delta;
 389     time_t t2;
 390
 391 #ifdef HAVE_GMTIME_R
 392     /* thread-safe version */
 393     struct tm keeptime2;
 394     gmt = (struct tm *)gmtime_r(&t, &keeptime2);
 395     if(!gmt)
 396       return -1; /* illegal date/time */
 397     t2 = mktime(gmt);
 398 #else
 399     /* It seems that at least the MSVC version of mktime() doesn't work
 400        properly if it gets the 'gmt' pointer passed in (which is a pointer
 401        returned from gmtime() pointing to static memory), so instead we copy
 402        the tm struct to a local struct and pass a pointer to that struct as
 403        input to mktime(). */
 404     struct tm gmt2;
 405     gmt = gmtime(&t); /* use gmtime_r() if available */
 406     if(!gmt)
 407       return -1; /* illegal date/time */
 408     gmt2 = *gmt;
 409     t2 = mktime(&gmt2);
 410 #endif
 411
 412     /* Add the time zone diff (between the given timezone and GMT) and the
 413        diff between the local time zone and GMT. */
 414     delta = (long)((tzoff!=-1?tzoff:0) + (t - t2));
 415
 416     if((delta>0) && (t + delta < t))
 417       return -1; /* time_t overflow */
 418
 419     t += delta;
 420   }
 421
 422   return t;
 423 }
 424
 425 time_t curl_getdate(const char *p, const time_t *now)
 426 {
 427   (void)now;
 428   return parsedate(p);
 429 }