source: UsbWattMeter/trunk/curl-7.47.1/lib/parsedate.c@ 164

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1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2014, 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 https://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 ***************************************************************************/
22/*
23 A brief summary of the date string formats this parser groks:
24
25 RFC 2616 3.3.1
26
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
30
31 we support dates without week day name:
32
33 06 Nov 1994 08:49:37 GMT
34 06-Nov-94 08:49:37 GMT
35 Nov 6 08:49:37 1994
36
37 without the time zone:
38
39 06 Nov 1994 08:49:37
40 06-Nov-94 08:49:37
41
42 weird order:
43
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)
47
48 time left out:
49
50 1994 Nov 6
51 06-Nov-94
52 Sun Nov 6 94
53
54 unusual separators:
55
56 1994.Nov.6
57 Sun/Nov/6/94/GMT
58
59 commonly used time zone names:
60
61 Sun, 06 Nov 1994 08:49:37 CET
62 06 Nov 1994 08:49:37 EST
63
64 time zones specified using RFC822 style:
65
66 Sun, 12 Sep 2004 15:05:58 -0700
67 Sat, 11 Sep 2004 21:32:11 +0200
68
69 compact numerical date strings:
70
71 20040912 15:05:58 -0700
72 20040911 +0200
73
74*/
75
76#include "curl_setup.h"
77
78#ifdef HAVE_LIMITS_H
79#include <limits.h>
80#endif
81
82#include <curl/curl.h>
83#include "rawstr.h"
84#include "warnless.h"
85#include "parsedate.h"
86
87const char * const Curl_wkday[] =
88{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
89static const char * const weekday[] =
90{ "Monday", "Tuesday", "Wednesday", "Thursday",
91 "Friday", "Saturday", "Sunday" };
92const char * const Curl_month[]=
93{ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
94 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
95
96struct tzinfo {
97 char name[5];
98 int offset; /* +/- in minutes */
99};
100
101/*
102 * parsedate()
103 *
104 * Returns:
105 *
106 * PARSEDATE_OK - a fine conversion
107 * PARSEDATE_FAIL - failed to convert
108 * PARSEDATE_LATER - time overflow at the far end of time_t
109 * PARSEDATE_SOONER - time underflow at the low end of time_t
110 */
111
112static int parsedate(const char *date, time_t *output);
113
114#define PARSEDATE_OK 0
115#define PARSEDATE_FAIL -1
116#define PARSEDATE_LATER 1
117#define PARSEDATE_SOONER 2
118
119/* Here's a bunch of frequently used time zone names. These were supported
120 by the old getdate parser. */
121#define tDAYZONE -60 /* offset for daylight savings time */
122static const struct tzinfo tz[]= {
123 {"GMT", 0}, /* Greenwich Mean */
124 {"UTC", 0}, /* Universal (Coordinated) */
125 {"WET", 0}, /* Western European */
126 {"BST", 0 tDAYZONE}, /* British Summer */
127 {"WAT", 60}, /* West Africa */
128 {"AST", 240}, /* Atlantic Standard */
129 {"ADT", 240 tDAYZONE}, /* Atlantic Daylight */
130 {"EST", 300}, /* Eastern Standard */
131 {"EDT", 300 tDAYZONE}, /* Eastern Daylight */
132 {"CST", 360}, /* Central Standard */
133 {"CDT", 360 tDAYZONE}, /* Central Daylight */
134 {"MST", 420}, /* Mountain Standard */
135 {"MDT", 420 tDAYZONE}, /* Mountain Daylight */
136 {"PST", 480}, /* Pacific Standard */
137 {"PDT", 480 tDAYZONE}, /* Pacific Daylight */
138 {"YST", 540}, /* Yukon Standard */
139 {"YDT", 540 tDAYZONE}, /* Yukon Daylight */
140 {"HST", 600}, /* Hawaii Standard */
141 {"HDT", 600 tDAYZONE}, /* Hawaii Daylight */
142 {"CAT", 600}, /* Central Alaska */
143 {"AHST", 600}, /* Alaska-Hawaii Standard */
144 {"NT", 660}, /* Nome */
145 {"IDLW", 720}, /* International Date Line West */
146 {"CET", -60}, /* Central European */
147 {"MET", -60}, /* Middle European */
148 {"MEWT", -60}, /* Middle European Winter */
149 {"MEST", -60 tDAYZONE}, /* Middle European Summer */
150 {"CEST", -60 tDAYZONE}, /* Central European Summer */
151 {"MESZ", -60 tDAYZONE}, /* Middle European Summer */
152 {"FWT", -60}, /* French Winter */
153 {"FST", -60 tDAYZONE}, /* French Summer */
154 {"EET", -120}, /* Eastern Europe, USSR Zone 1 */
155 {"WAST", -420}, /* West Australian Standard */
156 {"WADT", -420 tDAYZONE}, /* West Australian Daylight */
157 {"CCT", -480}, /* China Coast, USSR Zone 7 */
158 {"JST", -540}, /* Japan Standard, USSR Zone 8 */
159 {"EAST", -600}, /* Eastern Australian Standard */
160 {"EADT", -600 tDAYZONE}, /* Eastern Australian Daylight */
161 {"GST", -600}, /* Guam Standard, USSR Zone 9 */
162 {"NZT", -720}, /* New Zealand */
163 {"NZST", -720}, /* New Zealand Standard */
164 {"NZDT", -720 tDAYZONE}, /* New Zealand Daylight */
165 {"IDLE", -720}, /* International Date Line East */
166 /* Next up: Military timezone names. RFC822 allowed these, but (as noted in
167 RFC 1123) had their signs wrong. Here we use the correct signs to match
168 actual military usage.
169 */
170 {"A", +1 * 60}, /* Alpha */
171 {"B", +2 * 60}, /* Bravo */
172 {"C", +3 * 60}, /* Charlie */
173 {"D", +4 * 60}, /* Delta */
174 {"E", +5 * 60}, /* Echo */
175 {"F", +6 * 60}, /* Foxtrot */
176 {"G", +7 * 60}, /* Golf */
177 {"H", +8 * 60}, /* Hotel */
178 {"I", +9 * 60}, /* India */
179 /* "J", Juliet is not used as a timezone, to indicate the observer's local
180 time */
181 {"K", +10 * 60}, /* Kilo */
182 {"L", +11 * 60}, /* Lima */
183 {"M", +12 * 60}, /* Mike */
184 {"N", -1 * 60}, /* November */
185 {"O", -2 * 60}, /* Oscar */
186 {"P", -3 * 60}, /* Papa */
187 {"Q", -4 * 60}, /* Quebec */
188 {"R", -5 * 60}, /* Romeo */
189 {"S", -6 * 60}, /* Sierra */
190 {"T", -7 * 60}, /* Tango */
191 {"U", -8 * 60}, /* Uniform */
192 {"V", -9 * 60}, /* Victor */
193 {"W", -10 * 60}, /* Whiskey */
194 {"X", -11 * 60}, /* X-ray */
195 {"Y", -12 * 60}, /* Yankee */
196 {"Z", 0}, /* Zulu, zero meridian, a.k.a. UTC */
197};
198
199/* returns:
200 -1 no day
201 0 monday - 6 sunday
202*/
203
204static int checkday(const char *check, size_t len)
205{
206 int i;
207 const char * const *what;
208 bool found= FALSE;
209 if(len > 3)
210 what = &weekday[0];
211 else
212 what = &Curl_wkday[0];
213 for(i=0; i<7; i++) {
214 if(Curl_raw_equal(check, what[0])) {
215 found=TRUE;
216 break;
217 }
218 what++;
219 }
220 return found?i:-1;
221}
222
223static int checkmonth(const char *check)
224{
225 int i;
226 const char * const *what;
227 bool found= FALSE;
228
229 what = &Curl_month[0];
230 for(i=0; i<12; i++) {
231 if(Curl_raw_equal(check, what[0])) {
232 found=TRUE;
233 break;
234 }
235 what++;
236 }
237 return found?i:-1; /* return the offset or -1, no real offset is -1 */
238}
239
240/* return the time zone offset between GMT and the input one, in number
241 of seconds or -1 if the timezone wasn't found/legal */
242
243static int checktz(const char *check)
244{
245 unsigned int i;
246 const struct tzinfo *what;
247 bool found= FALSE;
248
249 what = tz;
250 for(i=0; i< sizeof(tz)/sizeof(tz[0]); i++) {
251 if(Curl_raw_equal(check, what->name)) {
252 found=TRUE;
253 break;
254 }
255 what++;
256 }
257 return found?what->offset*60:-1;
258}
259
260static void skip(const char **date)
261{
262 /* skip everything that aren't letters or digits */
263 while(**date && !ISALNUM(**date))
264 (*date)++;
265}
266
267enum assume {
268 DATE_MDAY,
269 DATE_YEAR,
270 DATE_TIME
271};
272
273/* this is a clone of 'struct tm' but with all fields we don't need or use
274 cut out */
275struct my_tm {
276 int tm_sec;
277 int tm_min;
278 int tm_hour;
279 int tm_mday;
280 int tm_mon;
281 int tm_year;
282};
283
284/* struct tm to time since epoch in GMT time zone.
285 * This is similar to the standard mktime function but for GMT only, and
286 * doesn't suffer from the various bugs and portability problems that
287 * some systems' implementations have.
288 */
289static time_t my_timegm(struct my_tm *tm)
290{
291 static const int month_days_cumulative [12] =
292 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
293 int month, year, leap_days;
294
295 if(tm->tm_year < 70)
296 /* we don't support years before 1970 as they will cause this function
297 to return a negative value */
298 return -1;
299
300 year = tm->tm_year + 1900;
301 month = tm->tm_mon;
302 if(month < 0) {
303 year += (11 - month) / 12;
304 month = 11 - (11 - month) % 12;
305 }
306 else if(month >= 12) {
307 year -= month / 12;
308 month = month % 12;
309 }
310
311 leap_days = year - (tm->tm_mon <= 1);
312 leap_days = ((leap_days / 4) - (leap_days / 100) + (leap_days / 400)
313 - (1969 / 4) + (1969 / 100) - (1969 / 400));
314
315 return ((((time_t) (year - 1970) * 365
316 + leap_days + month_days_cumulative [month] + tm->tm_mday - 1) * 24
317 + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec;
318}
319
320/*
321 * parsedate()
322 *
323 * Returns:
324 *
325 * PARSEDATE_OK - a fine conversion
326 * PARSEDATE_FAIL - failed to convert
327 * PARSEDATE_LATER - time overflow at the far end of time_t
328 * PARSEDATE_SOONER - time underflow at the low end of time_t
329 */
330
331static int parsedate(const char *date, time_t *output)
332{
333 time_t t = 0;
334 int wdaynum=-1; /* day of the week number, 0-6 (mon-sun) */
335 int monnum=-1; /* month of the year number, 0-11 */
336 int mdaynum=-1; /* day of month, 1 - 31 */
337 int hournum=-1;
338 int minnum=-1;
339 int secnum=-1;
340 int yearnum=-1;
341 int tzoff=-1;
342 struct my_tm tm;
343 enum assume dignext = DATE_MDAY;
344 const char *indate = date; /* save the original pointer */
345 int part = 0; /* max 6 parts */
346
347 while(*date && (part < 6)) {
348 bool found=FALSE;
349
350 skip(&date);
351
352 if(ISALPHA(*date)) {
353 /* a name coming up */
354 char buf[32]="";
355 size_t len;
356 if(sscanf(date, "%31[ABCDEFGHIJKLMNOPQRSTUVWXYZ"
357 "abcdefghijklmnopqrstuvwxyz]", buf))
358 len = strlen(buf);
359 else
360 len = 0;
361
362 if(wdaynum == -1) {
363 wdaynum = checkday(buf, len);
364 if(wdaynum != -1)
365 found = TRUE;
366 }
367 if(!found && (monnum == -1)) {
368 monnum = checkmonth(buf);
369 if(monnum != -1)
370 found = TRUE;
371 }
372
373 if(!found && (tzoff == -1)) {
374 /* this just must be a time zone string */
375 tzoff = checktz(buf);
376 if(tzoff != -1)
377 found = TRUE;
378 }
379
380 if(!found)
381 return PARSEDATE_FAIL; /* bad string */
382
383 date += len;
384 }
385 else if(ISDIGIT(*date)) {
386 /* a digit */
387 int val;
388 char *end;
389 if((secnum == -1) &&
390 (3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) {
391 /* time stamp! */
392 date += 8;
393 }
394 else if((secnum == -1) &&
395 (2 == sscanf(date, "%02d:%02d", &hournum, &minnum))) {
396 /* time stamp without seconds */
397 date += 5;
398 secnum = 0;
399 }
400 else {
401 long lval;
402 int error;
403 int old_errno;
404
405 old_errno = ERRNO;
406 SET_ERRNO(0);
407 lval = strtol(date, &end, 10);
408 error = ERRNO;
409 if(error != old_errno)
410 SET_ERRNO(old_errno);
411
412 if(error)
413 return PARSEDATE_FAIL;
414
415#if LONG_MAX != INT_MAX
416 if((lval > (long)INT_MAX) || (lval < (long)INT_MIN))
417 return PARSEDATE_FAIL;
418#endif
419
420 val = curlx_sltosi(lval);
421
422 if((tzoff == -1) &&
423 ((end - date) == 4) &&
424 (val <= 1400) &&
425 (indate< date) &&
426 ((date[-1] == '+' || date[-1] == '-'))) {
427 /* four digits and a value less than or equal to 1400 (to take into
428 account all sorts of funny time zone diffs) and it is preceded
429 with a plus or minus. This is a time zone indication. 1400 is
430 picked since +1300 is frequently used and +1400 is mentioned as
431 an edge number in the document "ISO C 200X Proposal: Timezone
432 Functions" at http://david.tribble.com/text/c0xtimezone.html If
433 anyone has a more authoritative source for the exact maximum time
434 zone offsets, please speak up! */
435 found = TRUE;
436 tzoff = (val/100 * 60 + val%100)*60;
437
438 /* the + and - prefix indicates the local time compared to GMT,
439 this we need ther reversed math to get what we want */
440 tzoff = date[-1]=='+'?-tzoff:tzoff;
441 }
442
443 if(((end - date) == 8) &&
444 (yearnum == -1) &&
445 (monnum == -1) &&
446 (mdaynum == -1)) {
447 /* 8 digits, no year, month or day yet. This is YYYYMMDD */
448 found = TRUE;
449 yearnum = val/10000;
450 monnum = (val%10000)/100-1; /* month is 0 - 11 */
451 mdaynum = val%100;
452 }
453
454 if(!found && (dignext == DATE_MDAY) && (mdaynum == -1)) {
455 if((val > 0) && (val<32)) {
456 mdaynum = val;
457 found = TRUE;
458 }
459 dignext = DATE_YEAR;
460 }
461
462 if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
463 yearnum = val;
464 found = TRUE;
465 if(yearnum < 1900) {
466 if(yearnum > 70)
467 yearnum += 1900;
468 else
469 yearnum += 2000;
470 }
471 if(mdaynum == -1)
472 dignext = DATE_MDAY;
473 }
474
475 if(!found)
476 return PARSEDATE_FAIL;
477
478 date = end;
479 }
480 }
481
482 part++;
483 }
484
485 if(-1 == secnum)
486 secnum = minnum = hournum = 0; /* no time, make it zero */
487
488 if((-1 == mdaynum) ||
489 (-1 == monnum) ||
490 (-1 == yearnum))
491 /* lacks vital info, fail */
492 return PARSEDATE_FAIL;
493
494#if SIZEOF_TIME_T < 5
495 /* 32 bit time_t can only hold dates to the beginning of 2038 */
496 if(yearnum > 2037) {
497 *output = 0x7fffffff;
498 return PARSEDATE_LATER;
499 }
500#endif
501
502 if(yearnum < 1970) {
503 *output = 0;
504 return PARSEDATE_SOONER;
505 }
506
507 if((mdaynum > 31) || (monnum > 11) ||
508 (hournum > 23) || (minnum > 59) || (secnum > 60))
509 return PARSEDATE_FAIL; /* clearly an illegal date */
510
511 tm.tm_sec = secnum;
512 tm.tm_min = minnum;
513 tm.tm_hour = hournum;
514 tm.tm_mday = mdaynum;
515 tm.tm_mon = monnum;
516 tm.tm_year = yearnum - 1900;
517
518 /* my_timegm() returns a time_t. time_t is often 32 bits, even on many
519 architectures that feature 64 bit 'long'.
520
521 Some systems have 64 bit time_t and deal with years beyond 2038. However,
522 even on some of the systems with 64 bit time_t mktime() returns -1 for
523 dates beyond 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06)
524 */
525 t = my_timegm(&tm);
526
527 /* time zone adjust (cast t to int to compare to negative one) */
528 if(-1 != (int)t) {
529
530 /* Add the time zone diff between local time zone and GMT. */
531 long delta = (long)(tzoff!=-1?tzoff:0);
532
533 if((delta>0) && (t > LONG_MAX - delta)) {
534 *output = 0x7fffffff;
535 return PARSEDATE_LATER; /* time_t overflow */
536 }
537
538 t += delta;
539 }
540
541 *output = t;
542
543 return PARSEDATE_OK;
544}
545
546time_t curl_getdate(const char *p, const time_t *now)
547{
548 time_t parsed = -1;
549 int rc = parsedate(p, &parsed);
550 (void)now; /* legacy argument from the past that we ignore */
551
552 switch(rc) {
553 case PARSEDATE_OK:
554 case PARSEDATE_LATER:
555 case PARSEDATE_SOONER:
556 return parsed;
557 }
558 /* everything else is fail */
559 return -1;
560}
561
562/*
563 * Curl_gmtime() is a gmtime() replacement for portability. Do not use the
564 * gmtime_r() or gmtime() functions anywhere else but here.
565 *
566 */
567
568CURLcode Curl_gmtime(time_t intime, struct tm *store)
569{
570 const struct tm *tm;
571#ifdef HAVE_GMTIME_R
572 /* thread-safe version */
573 tm = (struct tm *)gmtime_r(&intime, store);
574#else
575 tm = gmtime(&intime);
576 if(tm)
577 *store = *tm; /* copy the pointed struct to the local copy */
578#endif
579
580 if(!tm)
581 return CURLE_BAD_FUNCTION_ARGUMENT;
582 return CURLE_OK;
583}
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