mirror of
https://github.com/moparisthebest/curl
synced 2024-08-13 17:03:50 -04:00
44d84ac164
could very well cause a negate number get passed in and thus cause reading outside of the array usually used for this purpose. We avoid this by using the uppercase macro versions introduced just now that does some extra crazy typecasts to avoid byte codes > 127 to cause negative int values.
429 lines
11 KiB
C
429 lines
11 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2006, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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/*
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A brief summary of the date string formats this parser groks:
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RFC 2616 3.3.1
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Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
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Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
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Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
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we support dates without week day name:
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06 Nov 1994 08:49:37 GMT
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06-Nov-94 08:49:37 GMT
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Nov 6 08:49:37 1994
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without the time zone:
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06 Nov 1994 08:49:37
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06-Nov-94 08:49:37
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weird order:
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1994 Nov 6 08:49:37 (GNU date fails)
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GMT 08:49:37 06-Nov-94 Sunday
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94 6 Nov 08:49:37 (GNU date fails)
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time left out:
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1994 Nov 6
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06-Nov-94
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Sun Nov 6 94
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unusual separators:
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1994.Nov.6
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Sun/Nov/6/94/GMT
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commonly used time zone names:
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Sun, 06 Nov 1994 08:49:37 CET
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06 Nov 1994 08:49:37 EST
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time zones specified using RFC822 style:
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Sun, 12 Sep 2004 15:05:58 -0700
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Sat, 11 Sep 2004 21:32:11 +0200
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compact numerical date strings:
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20040912 15:05:58 -0700
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20040911 +0200
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*/
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#include "setup.h"
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h> /* for strtol() */
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#endif
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#include <curl/curl.h>
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static time_t Curl_parsedate(const char *date);
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const char * const Curl_wkday[] =
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{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
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static const char * const weekday[] =
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{ "Monday", "Tuesday", "Wednesday", "Thursday",
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"Friday", "Saturday", "Sunday" };
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const char * const Curl_month[]=
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{ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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struct tzinfo {
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const char *name;
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int offset; /* +/- in minutes */
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};
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/* Here's a bunch of frequently used time zone names. These were supported
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by the old getdate parser. */
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#define tDAYZONE -60 /* offset for daylight savings time */
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static const struct tzinfo tz[]= {
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{"GMT", 0}, /* Greenwich Mean */
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{"UTC", 0}, /* Universal (Coordinated) */
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{"WET", 0}, /* Western European */
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{"BST", 0 tDAYZONE}, /* British Summer */
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{"WAT", 60}, /* West Africa */
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{"AST", 240}, /* Atlantic Standard */
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{"ADT", 240 tDAYZONE}, /* Atlantic Daylight */
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{"EST", 300}, /* Eastern Standard */
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{"EDT", 300 tDAYZONE}, /* Eastern Daylight */
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{"CST", 360}, /* Central Standard */
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{"CDT", 360 tDAYZONE}, /* Central Daylight */
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{"MST", 420}, /* Mountain Standard */
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{"MDT", 420 tDAYZONE}, /* Mountain Daylight */
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{"PST", 480}, /* Pacific Standard */
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{"PDT", 480 tDAYZONE}, /* Pacific Daylight */
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{"YST", 540}, /* Yukon Standard */
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{"YDT", 540 tDAYZONE}, /* Yukon Daylight */
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{"HST", 600}, /* Hawaii Standard */
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{"HDT", 600 tDAYZONE}, /* Hawaii Daylight */
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{"CAT", 600}, /* Central Alaska */
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{"AHST", 600}, /* Alaska-Hawaii Standard */
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{"NT", 660}, /* Nome */
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{"IDLW", 720}, /* International Date Line West */
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{"CET", -60}, /* Central European */
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{"MET", -60}, /* Middle European */
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{"MEWT", -60}, /* Middle European Winter */
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{"MEST", -60 tDAYZONE}, /* Middle European Summer */
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{"CEST", -60 tDAYZONE}, /* Central European Summer */
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{"MESZ", -60 tDAYZONE}, /* Middle European Summer */
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{"FWT", -60}, /* French Winter */
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{"FST", -60 tDAYZONE}, /* French Summer */
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{"EET", -120}, /* Eastern Europe, USSR Zone 1 */
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{"WAST", -420}, /* West Australian Standard */
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{"WADT", -420 tDAYZONE}, /* West Australian Daylight */
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{"CCT", -480}, /* China Coast, USSR Zone 7 */
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{"JST", -540}, /* Japan Standard, USSR Zone 8 */
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{"EAST", -600}, /* Eastern Australian Standard */
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{"EADT", -600 tDAYZONE}, /* Eastern Australian Daylight */
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{"GST", -600}, /* Guam Standard, USSR Zone 9 */
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{"NZT", -720}, /* New Zealand */
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{"NZST", -720}, /* New Zealand Standard */
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{"NZDT", -720 tDAYZONE}, /* New Zealand Daylight */
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{"IDLE", -720}, /* International Date Line East */
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};
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/* returns:
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-1 no day
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0 monday - 6 sunday
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*/
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static int checkday(char *check, size_t len)
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{
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int i;
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const char * const *what;
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bool found= FALSE;
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if(len > 3)
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what = &weekday[0];
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else
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what = &Curl_wkday[0];
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for(i=0; i<7; i++) {
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if(curl_strequal(check, what[0])) {
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found=TRUE;
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break;
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}
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what++;
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}
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return found?i:-1;
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}
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static int checkmonth(char *check)
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{
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int i;
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const char * const *what;
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bool found= FALSE;
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what = &Curl_month[0];
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for(i=0; i<12; i++) {
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if(curl_strequal(check, what[0])) {
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found=TRUE;
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break;
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}
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what++;
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}
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return found?i:-1; /* return the offset or -1, no real offset is -1 */
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}
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/* return the time zone offset between GMT and the input one, in number
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of seconds or -1 if the timezone wasn't found/legal */
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static int checktz(char *check)
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{
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unsigned int i;
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const struct tzinfo *what;
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bool found= FALSE;
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what = tz;
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for(i=0; i< sizeof(tz)/sizeof(tz[0]); i++) {
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if(curl_strequal(check, what->name)) {
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found=TRUE;
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break;
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}
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what++;
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}
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return found?what->offset*60:-1;
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}
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static void skip(const char **date)
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{
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/* skip everything that aren't letters or digits */
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while(**date && !ISALNUM(**date))
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(*date)++;
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}
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enum assume {
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DATE_MDAY,
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DATE_YEAR,
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DATE_TIME
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};
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static time_t Curl_parsedate(const char *date)
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{
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time_t t = 0;
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int wdaynum=-1; /* day of the week number, 0-6 (mon-sun) */
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int monnum=-1; /* month of the year number, 0-11 */
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int mdaynum=-1; /* day of month, 1 - 31 */
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int hournum=-1;
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int minnum=-1;
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int secnum=-1;
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int yearnum=-1;
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int tzoff=-1;
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struct tm tm;
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enum assume dignext = DATE_MDAY;
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const char *indate = date; /* save the original pointer */
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int part = 0; /* max 6 parts */
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#ifdef WIN32
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/*
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* On Windows, we need an odd work-around for the case when no TZ variable
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* is set. If it isn't set and "automatic DST adjustment" is enabled, the
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* time functions below will return values one hour off! As reported and
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* investigated in bug report #1230118.
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*/
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const char *env = getenv("TZ");
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if(!env)
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putenv("TZ=GMT");
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#endif
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while(*date && (part < 6)) {
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bool found=FALSE;
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skip(&date);
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if(ISALPHA(*date)) {
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/* a name coming up */
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char buf[32]="";
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size_t len;
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sscanf(date, "%31[A-Za-z]", buf);
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len = strlen(buf);
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if(wdaynum == -1) {
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wdaynum = checkday(buf, len);
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if(wdaynum != -1)
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found = TRUE;
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}
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if(!found && (monnum == -1)) {
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monnum = checkmonth(buf);
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if(monnum != -1)
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found = TRUE;
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}
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if(!found && (tzoff == -1)) {
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/* this just must be a time zone string */
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tzoff = checktz(buf);
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if(tzoff != -1)
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found = TRUE;
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}
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if(!found)
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return -1; /* bad string */
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date += len;
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}
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else if(ISDIGIT(*date)) {
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/* a digit */
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int val;
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char *end;
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if((secnum == -1) &&
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(3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) {
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/* time stamp! */
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date += 8;
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found = TRUE;
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}
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else {
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val = (int)strtol(date, &end, 10);
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if((tzoff == -1) &&
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((end - date) == 4) &&
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(val < 1300) &&
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(indate< date) &&
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((date[-1] == '+' || date[-1] == '-'))) {
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/* four digits and a value less than 1300 and it is preceeded with
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a plus or minus. This is a time zone indication. */
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found = TRUE;
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tzoff = (val/100 * 60 + val%100)*60;
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/* the + and - prefix indicates the local time compared to GMT,
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this we need ther reversed math to get what we want */
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tzoff = date[-1]=='+'?-tzoff:tzoff;
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}
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if(((end - date) == 8) &&
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(yearnum == -1) &&
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(monnum == -1) &&
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(mdaynum == -1)) {
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/* 8 digits, no year, month or day yet. This is YYYYMMDD */
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found = TRUE;
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yearnum = val/10000;
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monnum = (val%10000)/100-1; /* month is 0 - 11 */
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mdaynum = val%100;
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}
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if(!found && (dignext == DATE_MDAY) && (mdaynum == -1)) {
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if((val > 0) && (val<32)) {
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mdaynum = val;
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found = TRUE;
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}
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dignext = DATE_YEAR;
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}
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if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
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yearnum = val;
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found = TRUE;
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if(yearnum < 1900) {
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if (yearnum > 70)
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yearnum += 1900;
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else
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yearnum += 2000;
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}
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if(mdaynum == -1)
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dignext = DATE_MDAY;
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}
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if(!found)
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return -1;
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date = end;
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}
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}
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part++;
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}
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if(-1 == secnum)
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secnum = minnum = hournum = 0; /* no time, make it zero */
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if((-1 == mdaynum) ||
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(-1 == monnum) ||
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(-1 == yearnum))
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/* lacks vital info, fail */
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return -1;
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#if SIZEOF_TIME_T < 5
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/* 32 bit time_t can only hold dates to the beginning of 2038 */
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if(yearnum > 2037)
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return 0x7fffffff;
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#endif
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tm.tm_sec = secnum;
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tm.tm_min = minnum;
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tm.tm_hour = hournum;
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tm.tm_mday = mdaynum;
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tm.tm_mon = monnum;
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tm.tm_year = yearnum - 1900;
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tm.tm_wday = 0;
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tm.tm_yday = 0;
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tm.tm_isdst = 0;
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/* mktime() returns a time_t. time_t is often 32 bits, even on many
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architectures that feature 64 bit 'long'.
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Some systems have 64 bit time_t and deal with years beyond 2038. However,
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even some of the systems with 64 bit time_t returns -1 for dates beyond
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03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06)
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*/
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t = mktime(&tm);
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/* time zone adjust (cast t to int to compare to negative one) */
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if(-1 != (int)t) {
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struct tm *gmt;
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long delta;
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time_t t2;
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#ifdef HAVE_GMTIME_R
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/* thread-safe version */
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struct tm keeptime2;
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gmt = (struct tm *)gmtime_r(&t, &keeptime2);
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#else
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gmt = gmtime(&t); /* use gmtime_r() if available */
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#endif
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if(!gmt)
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return -1; /* illegal date/time */
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t2 = mktime(gmt);
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/* Add the time zone diff (between the given timezone and GMT) and the
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diff between the local time zone and GMT. */
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delta = (long)((tzoff!=-1?tzoff:0) + (t - t2));
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if((delta>0) && (t + delta < t))
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return -1; /* time_t overflow */
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t += delta;
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}
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return t;
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}
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time_t curl_getdate(const char *p, const time_t *now)
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{
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(void)now;
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return Curl_parsedate(p);
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}
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