452 lines
12 KiB
C
452 lines
12 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 - 2008, 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: parsedate.c,v 1.36 2008-10-23 11:49:19 bagder Exp $
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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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#include "rawstr.h"
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#include "parsedate.h"
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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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char name[5];
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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(const 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_raw_equal(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(const 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_raw_equal(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(const 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_raw_equal(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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/* this is a clone of 'struct tm' but with all fields we don't need or use
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cut out */
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struct my_tm {
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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};
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/* struct tm to time since epoch in GMT time zone.
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* This is similar to the standard mktime function but for GMT only, and
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* doesn't suffer from the various bugs and portability problems that
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* some systems' implementations have.
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*/
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static time_t my_timegm(struct my_tm *tm)
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{
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static const int month_days_cumulative [12] =
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
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int month, year, leap_days;
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if(tm->tm_year < 70)
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/* we don't support years before 1970 as they will cause this function
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to return a negative value */
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return -1;
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year = tm->tm_year + 1900;
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month = tm->tm_mon;
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if (month < 0) {
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year += (11 - month) / 12;
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month = 11 - (11 - month) % 12;
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}
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else if (month >= 12) {
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year -= month / 12;
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month = month % 12;
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}
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leap_days = year - (tm->tm_mon <= 1);
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leap_days = ((leap_days / 4) - (leap_days / 100) + (leap_days / 400)
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- (1969 / 4) + (1969 / 100) - (1969 / 400));
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return ((((time_t) (year - 1970) * 365
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+ leap_days + month_days_cumulative [month] + tm->tm_mday - 1) * 24
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+ tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec;
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}
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static time_t 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 my_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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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[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz]",
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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 <= 1400) &&
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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 or equal to 1400 (to take into
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account all sorts of funny time zone diffs) and it is preceeded
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with a plus or minus. This is a time zone indication. 1400 is
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picked since +1300 is frequently used and +1400 is mentioned as
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an edge number in the document "ISO C 200X Proposal: Timezone
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Functions" at http://david.tribble.com/text/c0xtimezone.html If
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anyone has a more authoritative source for the exact maximum time
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zone offsets, please speak up! */
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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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/* my_timegm() 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 on some of the systems with 64 bit time_t mktime() returns -1 for
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dates beyond 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06)
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*/
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t = my_timegm(&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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/* Add the time zone diff between local time zone and GMT. */
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long delta = (long)(tzoff!=-1?tzoff:0);
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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 parsedate(p);
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}
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