1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
23 A brief summary of the date string formats this parser groks:
27 Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
28 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
29 Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
31 we support dates without week day name:
33 06 Nov 1994 08:49:37 GMT
34 06-Nov-94 08:49:37 GMT
37 without the time zone:
44 1994 Nov 6 08:49:37 (GNU date fails)
45 GMT 08:49:37 06-Nov-94 Sunday
46 94 6 Nov 08:49:37 (GNU date fails)
59 commonly used time zone names:
61 Sun, 06 Nov 1994 08:49:37 CET
62 06 Nov 1994 08:49:37 EST
64 time zones specified using RFC822 style:
66 Sun, 12 Sep 2004 15:05:58 -0700
67 Sat, 11 Sep 2004 21:32:11 +0200
69 compact numerical date strings:
71 20040912 15:05:58 -0700
81 #include <stdlib.h> /* for strtol() */
84 #include <curl/curl.h>
86 #include "parsedate.h"
88 const char * const Curl_wkday[] =
89 {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
90 static const char * const weekday[] =
91 { "Monday", "Tuesday", "Wednesday", "Thursday",
92 "Friday", "Saturday", "Sunday" };
93 const char * const Curl_month[]=
94 { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
95 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
99 int offset; /* +/- in minutes */
102 /* Here's a bunch of frequently used time zone names. These were supported
103 by the old getdate parser. */
104 #define tDAYZONE -60 /* offset for daylight savings time */
105 static const struct tzinfo tz[]= {
106 {"GMT", 0}, /* Greenwich Mean */
107 {"UTC", 0}, /* Universal (Coordinated) */
108 {"WET", 0}, /* Western European */
109 {"BST", 0 tDAYZONE}, /* British Summer */
110 {"WAT", 60}, /* West Africa */
111 {"AST", 240}, /* Atlantic Standard */
112 {"ADT", 240 tDAYZONE}, /* Atlantic Daylight */
113 {"EST", 300}, /* Eastern Standard */
114 {"EDT", 300 tDAYZONE}, /* Eastern Daylight */
115 {"CST", 360}, /* Central Standard */
116 {"CDT", 360 tDAYZONE}, /* Central Daylight */
117 {"MST", 420}, /* Mountain Standard */
118 {"MDT", 420 tDAYZONE}, /* Mountain Daylight */
119 {"PST", 480}, /* Pacific Standard */
120 {"PDT", 480 tDAYZONE}, /* Pacific Daylight */
121 {"YST", 540}, /* Yukon Standard */
122 {"YDT", 540 tDAYZONE}, /* Yukon Daylight */
123 {"HST", 600}, /* Hawaii Standard */
124 {"HDT", 600 tDAYZONE}, /* Hawaii Daylight */
125 {"CAT", 600}, /* Central Alaska */
126 {"AHST", 600}, /* Alaska-Hawaii Standard */
127 {"NT", 660}, /* Nome */
128 {"IDLW", 720}, /* International Date Line West */
129 {"CET", -60}, /* Central European */
130 {"MET", -60}, /* Middle European */
131 {"MEWT", -60}, /* Middle European Winter */
132 {"MEST", -60 tDAYZONE}, /* Middle European Summer */
133 {"CEST", -60 tDAYZONE}, /* Central European Summer */
134 {"MESZ", -60 tDAYZONE}, /* Middle European Summer */
135 {"FWT", -60}, /* French Winter */
136 {"FST", -60 tDAYZONE}, /* French Summer */
137 {"EET", -120}, /* Eastern Europe, USSR Zone 1 */
138 {"WAST", -420}, /* West Australian Standard */
139 {"WADT", -420 tDAYZONE}, /* West Australian Daylight */
140 {"CCT", -480}, /* China Coast, USSR Zone 7 */
141 {"JST", -540}, /* Japan Standard, USSR Zone 8 */
142 {"EAST", -600}, /* Eastern Australian Standard */
143 {"EADT", -600 tDAYZONE}, /* Eastern Australian Daylight */
144 {"GST", -600}, /* Guam Standard, USSR Zone 9 */
145 {"NZT", -720}, /* New Zealand */
146 {"NZST", -720}, /* New Zealand Standard */
147 {"NZDT", -720 tDAYZONE}, /* New Zealand Daylight */
148 {"IDLE", -720}, /* International Date Line East */
149 /* Next up: Military timezone names. RFC822 allowed these, but (as noted in
150 RFC 1123) had their signs wrong. Here we use the correct signs to match
151 actual military usage.
153 {"A", +1 * 60}, /* Alpha */
154 {"B", +2 * 60}, /* Bravo */
155 {"C", +3 * 60}, /* Charlie */
156 {"D", +4 * 60}, /* Delta */
157 {"E", +5 * 60}, /* Echo */
158 {"F", +6 * 60}, /* Foxtrot */
159 {"G", +7 * 60}, /* Golf */
160 {"H", +8 * 60}, /* Hotel */
161 {"I", +9 * 60}, /* India */
162 /* "J", Juliet is not used as a timezone, to indicate the observer's local time */
163 {"K", +10 * 60}, /* Kilo */
164 {"L", +11 * 60}, /* Lima */
165 {"M", +12 * 60}, /* Mike */
166 {"N", -1 * 60}, /* November */
167 {"O", -2 * 60}, /* Oscar */
168 {"P", -3 * 60}, /* Papa */
169 {"Q", -4 * 60}, /* Quebec */
170 {"R", -5 * 60}, /* Romeo */
171 {"S", -6 * 60}, /* Sierra */
172 {"T", -7 * 60}, /* Tango */
173 {"U", -8 * 60}, /* Uniform */
174 {"V", -9 * 60}, /* Victor */
175 {"W", -10 * 60}, /* Whiskey */
176 {"X", -11 * 60}, /* X-ray */
177 {"Y", -12 * 60}, /* Yankee */
178 {"Z", 0}, /* Zulu, zero meridian, a.k.a. UTC */
186 static int checkday(const char *check, size_t len)
189 const char * const *what;
194 what = &Curl_wkday[0];
196 if(Curl_raw_equal(check, what[0])) {
205 static int checkmonth(const char *check)
208 const char * const *what;
211 what = &Curl_month[0];
212 for(i=0; i<12; i++) {
213 if(Curl_raw_equal(check, what[0])) {
219 return found?i:-1; /* return the offset or -1, no real offset is -1 */
222 /* return the time zone offset between GMT and the input one, in number
223 of seconds or -1 if the timezone wasn't found/legal */
225 static int checktz(const char *check)
228 const struct tzinfo *what;
232 for(i=0; i< sizeof(tz)/sizeof(tz[0]); i++) {
233 if(Curl_raw_equal(check, what->name)) {
239 return found?what->offset*60:-1;
242 static void skip(const char **date)
244 /* skip everything that aren't letters or digits */
245 while(**date && !ISALNUM(**date))
255 /* this is a clone of 'struct tm' but with all fields we don't need or use
266 /* struct tm to time since epoch in GMT time zone.
267 * This is similar to the standard mktime function but for GMT only, and
268 * doesn't suffer from the various bugs and portability problems that
269 * some systems' implementations have.
271 static time_t my_timegm(struct my_tm *tm)
273 static const int month_days_cumulative [12] =
274 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
275 int month, year, leap_days;
278 /* we don't support years before 1970 as they will cause this function
279 to return a negative value */
282 year = tm->tm_year + 1900;
285 year += (11 - month) / 12;
286 month = 11 - (11 - month) % 12;
288 else if (month >= 12) {
293 leap_days = year - (tm->tm_mon <= 1);
294 leap_days = ((leap_days / 4) - (leap_days / 100) + (leap_days / 400)
295 - (1969 / 4) + (1969 / 100) - (1969 / 400));
297 return ((((time_t) (year - 1970) * 365
298 + leap_days + month_days_cumulative [month] + tm->tm_mday - 1) * 24
299 + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec;
307 * PARSEDATE_OK - a fine conversion
308 * PARSEDATE_FAIL - failed to convert
309 * PARSEDATE_LATER - time overflow at the far end of time_t
310 * PARSEDATE_SOONER - time underflow at the low end of time_t
313 int Curl_parsedate(const char *date, time_t *output)
316 int wdaynum=-1; /* day of the week number, 0-6 (mon-sun) */
317 int monnum=-1; /* month of the year number, 0-11 */
318 int mdaynum=-1; /* day of month, 1 - 31 */
325 enum assume dignext = DATE_MDAY;
326 const char *indate = date; /* save the original pointer */
327 int part = 0; /* max 6 parts */
329 while(*date && (part < 6)) {
335 /* a name coming up */
338 sscanf(date, "%31[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz]",
343 wdaynum = checkday(buf, len);
347 if(!found && (monnum == -1)) {
348 monnum = checkmonth(buf);
353 if(!found && (tzoff == -1)) {
354 /* this just must be a time zone string */
355 tzoff = checktz(buf);
361 return PARSEDATE_FAIL; /* bad string */
365 else if(ISDIGIT(*date)) {
370 (3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) {
376 val = (int)strtol(date, &end, 10);
379 ((end - date) == 4) &&
382 ((date[-1] == '+' || date[-1] == '-'))) {
383 /* four digits and a value less than or equal to 1400 (to take into
384 account all sorts of funny time zone diffs) and it is preceeded
385 with a plus or minus. This is a time zone indication. 1400 is
386 picked since +1300 is frequently used and +1400 is mentioned as
387 an edge number in the document "ISO C 200X Proposal: Timezone
388 Functions" at http://david.tribble.com/text/c0xtimezone.html If
389 anyone has a more authoritative source for the exact maximum time
390 zone offsets, please speak up! */
392 tzoff = (val/100 * 60 + val%100)*60;
394 /* the + and - prefix indicates the local time compared to GMT,
395 this we need ther reversed math to get what we want */
396 tzoff = date[-1]=='+'?-tzoff:tzoff;
399 if(((end - date) == 8) &&
403 /* 8 digits, no year, month or day yet. This is YYYYMMDD */
406 monnum = (val%10000)/100-1; /* month is 0 - 11 */
410 if(!found && (dignext == DATE_MDAY) && (mdaynum == -1)) {
411 if((val > 0) && (val<32)) {
418 if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
432 return PARSEDATE_FAIL;
442 secnum = minnum = hournum = 0; /* no time, make it zero */
444 if((-1 == mdaynum) ||
447 /* lacks vital info, fail */
448 return PARSEDATE_FAIL;
450 #if SIZEOF_TIME_T < 5
451 /* 32 bit time_t can only hold dates to the beginning of 2038 */
453 *output = 0x7fffffff;
454 return PARSEDATE_LATER;
460 return PARSEDATE_SOONER;
465 tm.tm_hour = hournum;
466 tm.tm_mday = mdaynum;
468 tm.tm_year = yearnum - 1900;
470 /* my_timegm() returns a time_t. time_t is often 32 bits, even on many
471 architectures that feature 64 bit 'long'.
473 Some systems have 64 bit time_t and deal with years beyond 2038. However,
474 even on some of the systems with 64 bit time_t mktime() returns -1 for
475 dates beyond 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06)
479 /* time zone adjust (cast t to int to compare to negative one) */
482 /* Add the time zone diff between local time zone and GMT. */
483 long delta = (long)(tzoff!=-1?tzoff:0);
485 if((delta>0) && (t + delta < t))
486 return -1; /* time_t overflow */
496 time_t curl_getdate(const char *p, const time_t *now)
499 int rc = Curl_parsedate(p, &parsed);
500 (void)now; /* legacy argument from the past that we ignore */
504 case PARSEDATE_LATER:
505 case PARSEDATE_SOONER:
508 /* everything else is fail */