333 lines
7.2 KiB
C
333 lines
7.2 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 - 2004, 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 (we always assume GMT):
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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 (curl_getdate() and 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 (curl_getdate() and 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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odd separators:
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1994.Nov.6
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Sun/Nov/6/94/GMT
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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 "parsedate.h"
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static const char *wkday[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
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static const char *weekday[] = { "Monday", "Tuesday", "Wednesday", "Thursday",
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"Friday", "Saturday", "Sunday" };
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const char *Curl_month[]= { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
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"Aug", "Sep", "Oct", "Nov", "Dec" };
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static const char *tz[]= { "GMT", "UTC", "MET" };
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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 **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 = &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 **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;
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}
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static int checktz(char *check)
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{
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int i;
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const char **what;
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bool found= FALSE;
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what = &tz[0];
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for(i=0; i<2; 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 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((int)**date))
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(*date)++;
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}
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#if 0
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#define TM_YEAR_ORIGIN 1900
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/* Yield A - B, measured in seconds. (from getdate.y) */
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static long
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difftm (struct tm *a, struct tm *b)
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{
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int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
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int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
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long days = (
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/* difference in day of year */
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a->tm_yday - b->tm_yday
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/* + intervening leap days */
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+ ((ay >> 2) - (by >> 2))
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- (ay / 100 - by / 100)
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+ ((ay / 100 >> 2) - (by / 100 >> 2))
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/* + difference in years * 365 */
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+ (long) (ay - by) * 365
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);
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return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
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+ (a->tm_min - b->tm_min))
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+ (a->tm_sec - b->tm_sec));
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}
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#endif
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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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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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long 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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long yearnum=-1;
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int tznum=-1;
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struct tm tm;
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enum assume dignext = DATE_MDAY;
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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((int)*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 && (tznum == -1)) {
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/* this just must be a time zone string */
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tznum = checktz(buf);
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if(tznum != -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((int)*date)) {
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/* a digit */
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long 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 = strtol(date, &end, 10);
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if((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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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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t = mktime(&tm);
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/* time zone adjust */
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{
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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 0
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/* previous involved version (that bugs?) */
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delta = difftm(&tm, gmt);
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#endif
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t2 = mktime(gmt);
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delta = t - t2;
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/* if we would like to adjust to a different input time zone than GMT,
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we would add that to the delta value right here */
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if(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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