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506 lines
13 KiB
506 lines
13 KiB
/*
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*
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* This file is part of the KDE libraries
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* Copyright (c) 2000-2002 Waldo Bastian <bastian@kde.org>
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* 2002 Rik Hemsley <rik@kde.org>
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*
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* $Id$
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*
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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 version 2 as published by the Free Software Foundation.
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*
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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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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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**/
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#include <config.h>
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#include <sys/param.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <tqstringlist.h>
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#include <krfcdate.h>
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static unsigned int ymdhms_to_seconds(int year, int mon, int day, int hour, int minute, int second)
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{
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if (sizeof(time_t) == 4)
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{
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if ((time_t)-1 < 0)
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{
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if (year >= 2038)
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{
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year = 2038;
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mon = 0;
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day = 1;
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hour = 0;
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minute = 0;
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second = 0;
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}
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}
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else
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{
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if (year >= 2115)
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{
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year = 2115;
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mon = 0;
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day = 1;
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hour = 0;
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minute = 0;
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second = 0;
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}
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}
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}
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unsigned int ret = (day - 32075) /* days */
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+ 1461L * (year + 4800L + (mon - 14) / 12) / 4
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+ 367 * (mon - 2 - (mon - 14) / 12 * 12) / 12
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- 3 * ((year + 4900L + (mon - 14) / 12) / 100) / 4
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- 2440588;
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ret = 24*ret + hour; /* hours */
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ret = 60*ret + minute; /* minutes */
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ret = 60*ret + second; /* seconds */
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return ret;
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}
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static const char haystack[37]="janfebmaraprmayjunjulaugsepoctnovdec";
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// we follow the recommendation of rfc2822 to consider all
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// obsolete time zones not listed here equivalent to "-0000"
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static const struct {
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const char tzName[4];
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int tzOffset;
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} known_zones[] = {
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{ "UT", 0 },
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{ "GMT", 0 },
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{ "EST", -300 },
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{ "EDT", -240 },
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{ "CST", -360 },
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{ "CDT", -300 },
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{ "MST", -420 },
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{ "MDT", -360 },
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{ "PST", -480 },
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{ "PDT", -420 },
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{ { 0,0,0,0 }, 0 }
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};
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time_t
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KRFCDate::parseDate(const TQString &_date)
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{
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if (_date.isEmpty())
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return 0;
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// This parse a date in the form:
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// Wednesday, 09-Nov-99 23:12:40 GMT
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// or
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// Sat, 01-Jan-2000 08:00:00 GMT
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// or
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// Sat, 01 Jan 2000 08:00:00 GMT
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// or
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// 01 Jan 99 22:00 +0100 (exceptions in rfc822/rfc2822)
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//
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// We ignore the weekday
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//
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time_t result = 0;
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int offset = 0;
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char *newPosStr;
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const char *dateString = _date.latin1();
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int day = 0;
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char monthStr[4];
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int month = -1;
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int year = 0;
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int hour = 0;
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int minute = 0;
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int second = 0;
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// Strip leading space
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while(*dateString && isspace(*dateString))
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dateString++;
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// Strip weekday
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while(*dateString && !isdigit(*dateString) && !isspace(*dateString))
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dateString++;
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// Strip trailing space
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while(*dateString && isspace(*dateString))
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dateString++;
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if (!*dateString)
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return result; // Invalid date
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if (isalpha(*dateString))
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{
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// ' Nov 5 1994 18:15:30 GMT'
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// Strip leading space
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while(*dateString && isspace(*dateString))
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dateString++;
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for(int i=0; i < 3;i++)
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{
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if (!*dateString || (*dateString == '-') || isspace(*dateString))
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return result; // Invalid date
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monthStr[i] = tolower(*dateString++);
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}
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monthStr[3] = '\0';
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newPosStr = (char*)strstr(haystack, monthStr);
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if (!newPosStr)
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return result; // Invalid date
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month = (newPosStr-haystack)/3; // Jan=00, Feb=01, Mar=02, ..
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if ((month < 0) || (month > 11))
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return result; // Invalid date
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while (*dateString && isalpha(*dateString))
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dateString++; // Skip rest of month-name
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}
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// ' 09-Nov-99 23:12:40 GMT'
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// ' 5 1994 18:15:30 GMT'
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day = strtol(dateString, &newPosStr, 10);
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dateString = newPosStr;
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if ((day < 1) || (day > 31))
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return result; // Invalid date;
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if (!*dateString)
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return result; // Invalid date
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while(*dateString && (isspace(*dateString) || (*dateString == '-')))
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dateString++;
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if (month == -1)
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{
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for(int i=0; i < 3;i++)
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{
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if (!*dateString || (*dateString == '-') || isspace(*dateString))
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return result; // Invalid date
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monthStr[i] = tolower(*dateString++);
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}
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monthStr[3] = '\0';
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newPosStr = (char*)strstr(haystack, monthStr);
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if (!newPosStr)
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return result; // Invalid date
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month = (newPosStr-haystack)/3; // Jan=00, Feb=01, Mar=02, ..
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if ((month < 0) || (month > 11))
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return result; // Invalid date
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while (*dateString && isalpha(*dateString))
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dateString++; // Skip rest of month-name
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}
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// '-99 23:12:40 GMT'
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while(*dateString && (isspace(*dateString) || (*dateString == '-')))
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dateString++;
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if (!*dateString || !isdigit(*dateString))
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return result; // Invalid date
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// '99 23:12:40 GMT'
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year = strtol(dateString, &newPosStr, 10);
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dateString = newPosStr;
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// Y2K: Solve 2 digit years
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if ((year >= 0) && (year < 50))
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year += 2000;
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if ((year >= 50) && (year < 100))
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year += 1900; // Y2K
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if ((year < 1900) || (year > 2500))
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return result; // Invalid date
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// Don't fail if the time is missing.
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if (*dateString)
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{
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// ' 23:12:40 GMT'
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if (!isspace(*dateString++))
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return result; // Invalid date
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hour = strtol(dateString, &newPosStr, 10);
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dateString = newPosStr;
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if ((hour < 0) || (hour > 23))
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return result; // Invalid date
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if (!*dateString)
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return result; // Invalid date
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// ':12:40 GMT'
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if (*dateString++ != ':')
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return result; // Invalid date
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minute = strtol(dateString, &newPosStr, 10);
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dateString = newPosStr;
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if ((minute < 0) || (minute > 59))
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return result; // Invalid date
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if (!*dateString)
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return result; // Invalid date
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// ':40 GMT'
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if (*dateString != ':' && !isspace(*dateString))
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return result; // Invalid date
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// seconds are optional in rfc822 + rfc2822
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if (*dateString ==':') {
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dateString++;
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second = strtol(dateString, &newPosStr, 10);
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dateString = newPosStr;
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if ((second < 0) || (second > 59))
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return result; // Invalid date
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} else {
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dateString++;
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}
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while(*dateString && isspace(*dateString))
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dateString++;
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}
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// don't fail if the time zone is missing, some
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// broken mail-/news-clients omit the time zone
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if (*dateString) {
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if ((strncasecmp(dateString, "gmt", 3) == 0) ||
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(strncasecmp(dateString, "utc", 3) == 0))
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{
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dateString += 3;
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while(*dateString && isspace(*dateString))
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dateString++;
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}
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if ((*dateString == '+') || (*dateString == '-')) {
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offset = strtol(dateString, &newPosStr, 10);
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if (abs(offset) < 30)
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{
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dateString = newPosStr;
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offset = offset * 100;
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if (*dateString && *(dateString+1))
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{
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dateString++;
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int minutes = strtol(dateString, &newPosStr, 10);
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if (offset > 0)
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offset += minutes;
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else
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offset -= minutes;
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}
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}
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if ((offset < -9959) || (offset > 9959))
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return result; // Invalid date
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int sgn = (offset < 0)? -1:1;
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offset = abs(offset);
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offset = ((offset / 100)*60 + (offset % 100))*sgn;
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} else {
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for (int i=0; known_zones[i].tzName != 0; i++) {
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if (0 == strncasecmp(dateString, known_zones[i].tzName, strlen(known_zones[i].tzName))) {
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offset = known_zones[i].tzOffset;
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break;
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}
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}
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}
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}
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result = ymdhms_to_seconds(year, month+1, day, hour, minute, second);
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// avoid negative time values
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if ((offset > 0) && (offset > result))
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offset = 0;
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result -= offset*60;
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// If epoch 0 return epoch +1 which is Thu, 01-Jan-70 00:00:01 GMT
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// This is so that parse error and valid epoch 0 return values won't
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// be the same for sensitive applications...
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if (result < 1) result = 1;
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return result;
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}
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time_t
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KRFCDate::parseDateISO8601( const TQString& input_ )
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{
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if (input_.isEmpty())
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return 0;
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// These dates look like this:
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// YYYY-MM-DDTHH:MM:SS
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// But they may also have 0, 1 or 2 suffixes.
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// Suffix 1: .secfrac (fraction of second)
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// Suffix 2: Either 'Z' or +zone or -zone, where zone is HHMM
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unsigned int year = 0;
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unsigned int month = 0;
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unsigned int mday = 0;
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unsigned int hour = 0;
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unsigned int min = 0;
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unsigned int sec = 0;
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int offset = 0;
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TQString input = input_;
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// First find the 'T' separator, if any.
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int tPos = input.find('T');
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// If there is no time, no month or no day specified, fill those missing
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// fields so that 'input' matches YYYY-MM-DDTHH:MM:SS
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if (-1 == tPos) {
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const int dashes = input.contains('-');
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if (0 == dashes) {
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input += "-01-01";
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} else if (1 == dashes) {
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input += "-01";
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}
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tPos = input.length();
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input += "T12:00:00";
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}
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// Now parse the date part.
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TQString dateString = input.left(tPos).stripWhiteSpace();
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TQString timeString = input.mid(tPos + 1).stripWhiteSpace();
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TQStringList l = TQStringList::split('-', dateString);
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if (l.size() < 3)
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return 0;
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year = l[0].toUInt();
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month = l[1].toUInt();
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mday = l[2].toUInt();
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// Z suffix means UTC.
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if ((QChar)'Z' == timeString.at(timeString.length() - 1)) {
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timeString.remove(timeString.length() - 1, 1);
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}
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// +zone or -zone suffix (offset from UTC).
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int plusPos = timeString.findRev('+');
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if (-1 != plusPos) {
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TQString offsetString = timeString.mid(plusPos + 1);
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offset = offsetString.left(2).toUInt() * 60 + offsetString.right(2).toUInt();
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timeString = timeString.left(plusPos);
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} else {
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int minusPos = timeString.findRev('-');
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if (-1 != minusPos) {
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TQString offsetString = timeString.mid(minusPos + 1);
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offset = - int(offsetString.left(2).toUInt() * 60 + offsetString.right(2).toUInt());
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timeString = timeString.left(minusPos);
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}
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}
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// secfrac suffix.
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int dotPos = timeString.findRev('.');
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if (-1 != dotPos) {
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timeString = timeString.left(dotPos);
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}
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// Now parse the time part.
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l = TQStringList::split(':', timeString);
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if (l.size() < 3)
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return 0;
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hour = l[0].toUInt();
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min = l[1].toUInt();
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sec = l[2].toUInt();
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time_t result = ymdhms_to_seconds(year, month, mday, hour, min, sec);
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// avoid negative time values
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if ((offset > 0) && (offset > result))
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offset = 0;
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result -= offset*60;
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// If epoch 0 return epoch +1 which is Thu, 01-Jan-70 00:00:01 GMT
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// This is so that parse error and valid epoch 0 return values won't
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// be the same for sensitive applications...
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if (result < 1) result = 1;
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return result;
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}
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int KRFCDate::localUTCOffset()
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{
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time_t timeNow = time((time_t*) 0);
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tm *tM = gmtime(&timeNow);
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unsigned int timeUTC = ymdhms_to_seconds(tM->tm_year+1900, tM->tm_mon+1, tM->tm_mday,
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tM->tm_hour, tM->tm_min, tM->tm_sec);
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tM = localtime(&timeNow);
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unsigned int timeLocal = ymdhms_to_seconds(tM->tm_year+1900, tM->tm_mon+1, tM->tm_mday,
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tM->tm_hour, tM->tm_min, tM->tm_sec);
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return ((int)(timeLocal-timeUTC))/60;
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}
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static const char * const day_names[] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static const char * const month_names[] = {
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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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TQCString KRFCDate::rfc2822DateString(time_t utcTime, int utcOffset)
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{
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utcTime += utcOffset * 60;
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tm *tM = gmtime(&utcTime);
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char sgn = (utcOffset < 0) ? '-' : '+';
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int z = (utcOffset < 0) ? -utcOffset : utcOffset;
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TQCString dateStr;
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dateStr.sprintf("%s, %02d %s %04d %02d:%02d:%02d %c%02d%02d",
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day_names[tM->tm_wday], tM->tm_mday,
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month_names[tM->tm_mon], tM->tm_year+1900,
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tM->tm_hour, tM->tm_min, tM->tm_sec,
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sgn, z/60%24, z%60);
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return dateStr;
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}
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TQCString KRFCDate::rfc2822DateString(time_t utcTime)
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{
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return rfc2822DateString(utcTime, localUTCOffset());
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}
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