1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2008, 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.
22 ***************************************************************************/
24 A brief summary of the date string formats this parser groks:
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
32 we support dates without week day name:
34 06 Nov 1994 08:49:37 GMT
35 06-Nov-94 08:49:37 GMT
38 without the time zone:
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)
60 commonly used time zone names:
62 Sun, 06 Nov 1994 08:49:37 CET
63 06 Nov 1994 08:49:37 EST
65 time zones specified using RFC822 style:
67 Sun, 12 Sep 2004 15:05:58 -0700
68 Sat, 11 Sep 2004 21:32:11 +0200
70 compact numerical date strings:
72 20040912 15:05:58 -0700
82 #include <stdlib.h> /* for strtol() */
85 #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 */
156 static int checkday(const char *check, size_t len)
159 const char * const *what;
164 what = &Curl_wkday[0];
166 if(curl_strequal(check, what[0])) {
175 static int checkmonth(const char *check)
178 const char * const *what;
181 what = &Curl_month[0];
182 for(i=0; i<12; i++) {
183 if(curl_strequal(check, what[0])) {
189 return found?i:-1; /* return the offset or -1, no real offset is -1 */
192 /* return the time zone offset between GMT and the input one, in number
193 of seconds or -1 if the timezone wasn't found/legal */
195 static int checktz(const char *check)
198 const struct tzinfo *what;
202 for(i=0; i< sizeof(tz)/sizeof(tz[0]); i++) {
203 if(curl_strequal(check, what->name)) {
209 return found?what->offset*60:-1;
212 static void skip(const char **date)
214 /* skip everything that aren't letters or digits */
215 while(**date && !ISALNUM(**date))
225 static time_t parsedate(const char *date)
228 int wdaynum=-1; /* day of the week number, 0-6 (mon-sun) */
229 int monnum=-1; /* month of the year number, 0-11 */
230 int mdaynum=-1; /* day of month, 1 - 31 */
237 enum assume dignext = DATE_MDAY;
238 const char *indate = date; /* save the original pointer */
239 int part = 0; /* max 6 parts */
241 while(*date && (part < 6)) {
247 /* a name coming up */
250 sscanf(date, "%31[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz]", buf);
254 wdaynum = checkday(buf, len);
258 if(!found && (monnum == -1)) {
259 monnum = checkmonth(buf);
264 if(!found && (tzoff == -1)) {
265 /* this just must be a time zone string */
266 tzoff = checktz(buf);
272 return -1; /* bad string */
276 else if(ISDIGIT(*date)) {
281 (3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) {
287 val = (int)strtol(date, &end, 10);
290 ((end - date) == 4) &&
293 ((date[-1] == '+' || date[-1] == '-'))) {
294 /* four digits and a value less than or equal to 1400 (to take into
295 account all sorts of funny time zone diffs) and it is preceeded
296 with a plus or minus. This is a time zone indication. 1400 is
297 picked since +1300 is frequently used and +1400 is mentioned as
298 an edge number in the document "ISO C 200X Proposal: Timezone
299 Functions" at http://david.tribble.com/text/c0xtimezone.html If
300 anyone has a more authoritative source for the exact maximum time
301 zone offsets, please speak up! */
303 tzoff = (val/100 * 60 + val%100)*60;
305 /* the + and - prefix indicates the local time compared to GMT,
306 this we need ther reversed math to get what we want */
307 tzoff = date[-1]=='+'?-tzoff:tzoff;
310 if(((end - date) == 8) &&
314 /* 8 digits, no year, month or day yet. This is YYYYMMDD */
317 monnum = (val%10000)/100-1; /* month is 0 - 11 */
321 if(!found && (dignext == DATE_MDAY) && (mdaynum == -1)) {
322 if((val > 0) && (val<32)) {
329 if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
353 secnum = minnum = hournum = 0; /* no time, make it zero */
355 if((-1 == mdaynum) ||
358 /* lacks vital info, fail */
361 #if SIZEOF_TIME_T < 5
362 /* 32 bit time_t can only hold dates to the beginning of 2038 */
369 tm.tm_hour = hournum;
370 tm.tm_mday = mdaynum;
372 tm.tm_year = yearnum - 1900;
377 /* mktime() returns a time_t. time_t is often 32 bits, even on many
378 architectures that feature 64 bit 'long'.
380 Some systems have 64 bit time_t and deal with years beyond 2038. However,
381 even some of the systems with 64 bit time_t returns -1 for dates beyond
382 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06)
386 /* time zone adjust (cast t to int to compare to negative one) */
393 /* thread-safe version */
395 gmt = (struct tm *)gmtime_r(&t, &keeptime2);
397 return -1; /* illegal date/time */
400 /* It seems that at least the MSVC version of mktime() doesn't work
401 properly if it gets the 'gmt' pointer passed in (which is a pointer
402 returned from gmtime() pointing to static memory), so instead we copy
403 the tm struct to a local struct and pass a pointer to that struct as
404 input to mktime(). */
406 gmt = gmtime(&t); /* use gmtime_r() if available */
408 return -1; /* illegal date/time */
413 /* Add the time zone diff (between the given timezone and GMT) and the
414 diff between the local time zone and GMT. */
415 delta = (long)((tzoff!=-1?tzoff:0) + (t - t2));
417 if((delta>0) && (t + delta < t))
418 return -1; /* time_t overflow */
426 time_t curl_getdate(const char *p, const time_t *now)