base
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biosvos
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/*
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Date manipulation routines
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Copyright (C) 1999-2005, Joe Orton <joe@manyfish.co.uk>
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Copyright (C) 2004 Jiang Lei <tristone@deluxe.ocn.ne.jp>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <time.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef WIN32
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#include <windows.h> /* for TIME_ZONE_INFORMATION */
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#endif
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#include "ne_alloc.h"
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#include "ne_dates.h"
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#include "ne_string.h"
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/* Generic date manipulation routines. */
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/* ISO8601: 2001-01-01T12:30:00Z */
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#define ISO8601_FORMAT_Z "%04d-%02d-%02dT%02d:%02d:%lfZ"
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#define ISO8601_FORMAT_M "%04d-%02d-%02dT%02d:%02d:%lf-%02d:%02d"
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#define ISO8601_FORMAT_P "%04d-%02d-%02dT%02d:%02d:%lf+%02d:%02d"
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/* RFC1123: Sun, 06 Nov 1994 08:49:37 GMT */
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#define RFC1123_FORMAT "%3s, %02d %3s %4d %02d:%02d:%02d GMT"
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/* RFC850: Sunday, 06-Nov-94 08:49:37 GMT */
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#define RFC1036_FORMAT "%10s %2d-%3s-%2d %2d:%2d:%2d GMT"
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/* asctime: Wed Jun 30 21:49:08 1993 */
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#define ASCTIME_FORMAT "%3s %3s %2d %2d:%2d:%2d %4d"
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static const char *const rfc1123_weekdays[7] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static const char *const short_months[12] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
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#define GMTOFF(t) ((t).tm_gmtoff)
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#elif defined(HAVE_STRUCT_TM___TM_GMTOFF)
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#define GMTOFF(t) ((t).__tm_gmtoff)
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#elif defined(WIN32)
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#define GMTOFF(t) (gmt_to_local_win32())
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#else
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/* FIXME: work out the offset anyway. */
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#define GMTOFF(t) (0)
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#endif
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#ifdef WIN32
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time_t gmt_to_local_win32(void)
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{
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TIME_ZONE_INFORMATION tzinfo;
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DWORD dwStandardDaylight;
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long bias;
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dwStandardDaylight = GetTimeZoneInformation(&tzinfo);
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bias = tzinfo.Bias;
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if (dwStandardDaylight == TIME_ZONE_ID_STANDARD)
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bias += tzinfo.StandardBias;
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if (dwStandardDaylight == TIME_ZONE_ID_DAYLIGHT)
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bias += tzinfo.DaylightBias;
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return (- bias * 60);
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}
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#endif
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/* Returns the time/date GMT, in RFC1123-type format: eg
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* Sun, 06 Nov 1994 08:49:37 GMT. */
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char *ne_rfc1123_date(time_t anytime) {
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struct tm *gmt;
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char *ret;
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gmt = gmtime(&anytime);
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if (gmt == NULL)
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return NULL;
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ret = ne_malloc(29 + 1); /* dates are 29 chars long */
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/* it goes: Sun, 06 Nov 1994 08:49:37 GMT */
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ne_snprintf(ret, 30, RFC1123_FORMAT,
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rfc1123_weekdays[gmt->tm_wday], gmt->tm_mday,
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short_months[gmt->tm_mon], 1900 + gmt->tm_year,
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gmt->tm_hour, gmt->tm_min, gmt->tm_sec);
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return ret;
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}
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/* Takes an ISO-8601-formatted date string and returns the time_t.
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* Returns (time_t)-1 if the parse fails. */
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time_t ne_iso8601_parse(const char *date)
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{
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struct tm gmt = {0};
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int off_hour, off_min;
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double sec;
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off_t fix;
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int n;
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/* it goes: ISO8601: 2001-01-01T12:30:00+03:30 */
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if ((n = sscanf(date, ISO8601_FORMAT_P,
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&gmt.tm_year, &gmt.tm_mon, &gmt.tm_mday,
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&gmt.tm_hour, &gmt.tm_min, &sec,
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&off_hour, &off_min)) == 8) {
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gmt.tm_sec = (int)sec;
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fix = - off_hour * 3600 - off_min * 60;
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}
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/* it goes: ISO8601: 2001-01-01T12:30:00-03:30 */
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else if ((n = sscanf(date, ISO8601_FORMAT_M,
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&gmt.tm_year, &gmt.tm_mon, &gmt.tm_mday,
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&gmt.tm_hour, &gmt.tm_min, &sec,
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&off_hour, &off_min)) == 8) {
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gmt.tm_sec = (int)sec;
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fix = off_hour * 3600 + off_min * 60;
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}
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/* it goes: ISO8601: 2001-01-01T12:30:00Z */
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else if ((n = sscanf(date, ISO8601_FORMAT_Z,
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&gmt.tm_year, &gmt.tm_mon, &gmt.tm_mday,
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&gmt.tm_hour, &gmt.tm_min, &sec)) == 6) {
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gmt.tm_sec = (int)sec;
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fix = 0;
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}
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else {
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return (time_t)-1;
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}
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gmt.tm_year -= 1900;
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gmt.tm_isdst = -1;
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gmt.tm_mon--;
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return mktime(&gmt) + fix + GMTOFF(gmt);
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}
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/* Takes an RFC1123-formatted date string and returns the time_t.
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* Returns (time_t)-1 if the parse fails. */
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time_t ne_rfc1123_parse(const char *date)
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{
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struct tm gmt = {0};
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char wkday[4], mon[4];
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int n;
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/* it goes: Sun, 06 Nov 1994 08:49:37 GMT */
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n = sscanf(date, RFC1123_FORMAT,
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wkday, &gmt.tm_mday, mon, &gmt.tm_year, &gmt.tm_hour,
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&gmt.tm_min, &gmt.tm_sec);
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/* Is it portable to check n==7 here? */
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gmt.tm_year -= 1900;
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for (n=0; n<12; n++)
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if (strcmp(mon, short_months[n]) == 0)
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break;
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/* tm_mon comes out as 12 if the month is corrupt, which is desired,
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* since the mktime will then fail */
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gmt.tm_mon = n;
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gmt.tm_isdst = -1;
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return mktime(&gmt) + GMTOFF(gmt);
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}
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/* Takes a string containing a RFC1036-style date and returns the time_t */
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time_t ne_rfc1036_parse(const char *date)
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{
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struct tm gmt = {0};
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int n;
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char wkday[11], mon[4];
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/* RFC850/1036 style dates: Sunday, 06-Nov-94 08:49:37 GMT */
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n = sscanf(date, RFC1036_FORMAT,
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wkday, &gmt.tm_mday, mon, &gmt.tm_year,
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&gmt.tm_hour, &gmt.tm_min, &gmt.tm_sec);
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if (n != 7) {
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return (time_t)-1;
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}
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/* portable to check n here? */
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for (n=0; n<12; n++)
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if (strcmp(mon, short_months[n]) == 0)
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break;
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/* tm_mon comes out as 12 if the month is corrupt, which is desired,
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* since the mktime will then fail */
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/* Defeat Y2K bug. */
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if (gmt.tm_year < 50)
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gmt.tm_year += 100;
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gmt.tm_mon = n;
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gmt.tm_isdst = -1;
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return mktime(&gmt) + GMTOFF(gmt);
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}
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/* (as)ctime dates are like:
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* Wed Jun 30 21:49:08 1993
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*/
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time_t ne_asctime_parse(const char *date)
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{
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struct tm gmt = {0};
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int n;
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char wkday[4], mon[4];
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n = sscanf(date, ASCTIME_FORMAT,
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wkday, mon, &gmt.tm_mday,
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&gmt.tm_hour, &gmt.tm_min, &gmt.tm_sec,
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&gmt.tm_year);
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/* portable to check n here? */
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for (n=0; n<12; n++)
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if (strcmp(mon, short_months[n]) == 0)
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break;
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/* tm_mon comes out as 12 if the month is corrupt, which is desired,
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* since the mktime will then fail */
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gmt.tm_mon = n;
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gmt.tm_isdst = -1;
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return mktime(&gmt) + GMTOFF(gmt);
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}
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/* HTTP-date parser */
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time_t ne_httpdate_parse(const char *date)
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{
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time_t tmp;
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tmp = ne_rfc1123_parse(date);
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if (tmp == -1) {
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tmp = ne_rfc1036_parse(date);
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if (tmp == -1)
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tmp = ne_asctime_parse(date);
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}
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return tmp;
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}
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