krfcdate.cpp
/*
*
* This file is part of the KDE libraries
* Copyright (c) 2000-2002 Waldo Bastian <bastian@kde.org>
* 2002 Rik Hemsley <rik@kde.org>
*
* $Id: krfcdate.cpp 514036 2006-02-27 09:36:44Z osterfeld $
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License version 2 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
**/
#include <config.h>
#include <sys/param.h>
#include <ctype.h>
#include <stdlib.h>
#include <qstringlist.h>
#include <krfcdate.h>
static unsigned int ymdhms_to_seconds(int year, int mon, int day, int hour, int minute, int second)
{
if (sizeof(time_t) == 4)
{
if ((time_t)-1 < 0)
{
if (year >= 2038)
{
year = 2038;
mon = 0;
day = 1;
hour = 0;
minute = 0;
second = 0;
}
}
else
{
if (year >= 2115)
{
year = 2115;
mon = 0;
day = 1;
hour = 0;
minute = 0;
second = 0;
}
}
}
unsigned int ret = (day - 32075) /* days */
+ 1461L * (year + 4800L + (mon - 14) / 12) / 4
+ 367 * (mon - 2 - (mon - 14) / 12 * 12) / 12
- 3 * ((year + 4900L + (mon - 14) / 12) / 100) / 4
- 2440588;
ret = 24*ret + hour; /* hours */
ret = 60*ret + minute; /* minutes */
ret = 60*ret + second; /* seconds */
return ret;
}
static const char haystack[37]="janfebmaraprmayjunjulaugsepoctnovdec";
// we follow the recommendation of rfc2822 to consider all
// obsolete time zones not listed here equivalent to "-0000"
static const struct {
const char tzName[4];
int tzOffset;
} known_zones[] = {
{ "UT", 0 },
{ "GMT", 0 },
{ "EST", -300 },
{ "EDT", -240 },
{ "CST", -360 },
{ "CDT", -300 },
{ "MST", -420 },
{ "MDT", -360 },
{ "PST", -480 },
{ "PDT", -420 },
{ { 0,0,0,0 }, 0 }
};
time_t
KRFCDate::parseDate(const QString &_date)
{
if (_date.isEmpty())
return 0;
// This parse a date in the form:
// Wednesday, 09-Nov-99 23:12:40 GMT
// or
// Sat, 01-Jan-2000 08:00:00 GMT
// or
// Sat, 01 Jan 2000 08:00:00 GMT
// or
// 01 Jan 99 22:00 +0100 (exceptions in rfc822/rfc2822)
//
// We ignore the weekday
//
time_t result = 0;
int offset = 0;
char *newPosStr;
const char *dateString = _date.latin1();
int day = 0;
char monthStr[4];
int month = -1;
int year = 0;
int hour = 0;
int minute = 0;
int second = 0;
// Strip leading space
while(*dateString && isspace(*dateString))
dateString++;
// Strip weekday
while(*dateString && !isdigit(*dateString) && !isspace(*dateString))
dateString++;
// Strip trailing space
while(*dateString && isspace(*dateString))
dateString++;
if (!*dateString)
return result; // Invalid date
if (isalpha(*dateString))
{
// ' Nov 5 1994 18:15:30 GMT'
// Strip leading space
while(*dateString && isspace(*dateString))
dateString++;
for(int i=0; i < 3;i++)
{
if (!*dateString || (*dateString == '-') || isspace(*dateString))
return result; // Invalid date
monthStr[i] = tolower(*dateString++);
}
monthStr[3] = '\0';
newPosStr = (char*)strstr(haystack, monthStr);
if (!newPosStr)
return result; // Invalid date
month = (newPosStr-haystack)/3; // Jan=00, Feb=01, Mar=02, ..
if ((month < 0) || (month > 11))
return result; // Invalid date
while (*dateString && isalpha(*dateString))
dateString++; // Skip rest of month-name
}
// ' 09-Nov-99 23:12:40 GMT'
// ' 5 1994 18:15:30 GMT'
day = strtol(dateString, &newPosStr, 10);
dateString = newPosStr;
if ((day < 1) || (day > 31))
return result; // Invalid date;
if (!*dateString)
return result; // Invalid date
while(*dateString && (isspace(*dateString) || (*dateString == '-')))
dateString++;
if (month == -1)
{
for(int i=0; i < 3;i++)
{
if (!*dateString || (*dateString == '-') || isspace(*dateString))
return result; // Invalid date
monthStr[i] = tolower(*dateString++);
}
monthStr[3] = '\0';
newPosStr = (char*)strstr(haystack, monthStr);
if (!newPosStr)
return result; // Invalid date
month = (newPosStr-haystack)/3; // Jan=00, Feb=01, Mar=02, ..
if ((month < 0) || (month > 11))
return result; // Invalid date
while (*dateString && isalpha(*dateString))
dateString++; // Skip rest of month-name
}
// '-99 23:12:40 GMT'
while(*dateString && (isspace(*dateString) || (*dateString == '-')))
dateString++;
if (!*dateString || !isdigit(*dateString))
return result; // Invalid date
// '99 23:12:40 GMT'
year = strtol(dateString, &newPosStr, 10);
dateString = newPosStr;
// Y2K: Solve 2 digit years
if ((year >= 0) && (year < 50))
year += 2000;
if ((year >= 50) && (year < 100))
year += 1900; // Y2K
if ((year < 1900) || (year > 2500))
return result; // Invalid date
// Don't fail if the time is missing.
if (*dateString)
{
// ' 23:12:40 GMT'
if (!isspace(*dateString++))
return result; // Invalid date
hour = strtol(dateString, &newPosStr, 10);
dateString = newPosStr;
if ((hour < 0) || (hour > 23))
return result; // Invalid date
if (!*dateString)
return result; // Invalid date
// ':12:40 GMT'
if (*dateString++ != ':')
return result; // Invalid date
minute = strtol(dateString, &newPosStr, 10);
dateString = newPosStr;
if ((minute < 0) || (minute > 59))
return result; // Invalid date
if (!*dateString)
return result; // Invalid date
// ':40 GMT'
if (*dateString != ':' && !isspace(*dateString))
return result; // Invalid date
// seconds are optional in rfc822 + rfc2822
if (*dateString ==':') {
dateString++;
second = strtol(dateString, &newPosStr, 10);
dateString = newPosStr;
if ((second < 0) || (second > 59))
return result; // Invalid date
} else {
dateString++;
}
while(*dateString && isspace(*dateString))
dateString++;
}
// don't fail if the time zone is missing, some
// broken mail-/news-clients omit the time zone
if (*dateString) {
if ((strncasecmp(dateString, "gmt", 3) == 0) ||
(strncasecmp(dateString, "utc", 3) == 0))
{
dateString += 3;
while(*dateString && isspace(*dateString))
dateString++;
}
if ((*dateString == '+') || (*dateString == '-')) {
offset = strtol(dateString, &newPosStr, 10);
if (abs(offset) < 30)
{
dateString = newPosStr;
offset = offset * 100;
if (*dateString && *(dateString+1))
{
dateString++;
int minutes = strtol(dateString, &newPosStr, 10);
if (offset > 0)
offset += minutes;
else
offset -= minutes;
}
}
if ((offset < -9959) || (offset > 9959))
return result; // Invalid date
int sgn = (offset < 0)? -1:1;
offset = abs(offset);
offset = ((offset / 100)*60 + (offset % 100))*sgn;
} else {
for (int i=0; known_zones[i].tzName != 0; i++) {
if (0 == strncasecmp(dateString, known_zones[i].tzName, strlen(known_zones[i].tzName))) {
offset = known_zones[i].tzOffset;
break;
}
}
}
}
result = ymdhms_to_seconds(year, month+1, day, hour, minute, second);
// avoid negative time values
if ((offset > 0) && (offset > result))
offset = 0;
result -= offset*60;
// If epoch 0 return epoch +1 which is Thu, 01-Jan-70 00:00:01 GMT
// This is so that parse error and valid epoch 0 return values won't
// be the same for sensitive applications...
if (result < 1) result = 1;
return result;
}
time_t
KRFCDate::parseDateISO8601( const QString& input_ )
{
if (input_.isEmpty())
return 0;
// These dates look like this:
// YYYY-MM-DDTHH:MM:SS
// But they may also have 0, 1 or 2 suffixes.
// Suffix 1: .secfrac (fraction of second)
// Suffix 2: Either 'Z' or +zone or -zone, where zone is HHMM
unsigned int year = 0;
unsigned int month = 0;
unsigned int mday = 0;
unsigned int hour = 0;
unsigned int min = 0;
unsigned int sec = 0;
int offset = 0;
QString input = input_;
// First find the 'T' separator, if any.
int tPos = input.find('T');
// If there is no time, no month or no day specified, fill those missing
// fields so that 'input' matches YYYY-MM-DDTHH:MM:SS
if (-1 == tPos) {
const int dashes = input.contains('-');
if (0 == dashes) {
input += "-01-01";
} else if (1 == dashes) {
input += "-01";
}
tPos = input.length();
input += "T12:00:00";
}
// Now parse the date part.
QString dateString = input.left(tPos).stripWhiteSpace();
QString timeString = input.mid(tPos + 1).stripWhiteSpace();
QStringList l = QStringList::split('-', dateString);
if (l.size() < 3)
return 0;
year = l[0].toUInt();
month = l[1].toUInt();
mday = l[2].toUInt();
// Z suffix means UTC.
if ('Z' == timeString.at(timeString.length() - 1)) {
timeString.remove(timeString.length() - 1, 1);
}
// +zone or -zone suffix (offset from UTC).
int plusPos = timeString.findRev('+');
if (-1 != plusPos) {
QString offsetString = timeString.mid(plusPos + 1);
offset = offsetString.left(2).toUInt() * 60 + offsetString.right(2).toUInt();
timeString = timeString.left(plusPos);
} else {
int minusPos = timeString.findRev('-');
if (-1 != minusPos) {
QString offsetString = timeString.mid(minusPos + 1);
offset = - int(offsetString.left(2).toUInt() * 60 + offsetString.right(2).toUInt());
timeString = timeString.left(minusPos);
}
}
// secfrac suffix.
int dotPos = timeString.findRev('.');
if (-1 != dotPos) {
timeString = timeString.left(dotPos);
}
// Now parse the time part.
l = QStringList::split(':', timeString);
if (l.size() < 3)
return 0;
hour = l[0].toUInt();
min = l[1].toUInt();
sec = l[2].toUInt();
time_t result = ymdhms_to_seconds(year, month, mday, hour, min, sec);
// avoid negative time values
if ((offset > 0) && (offset > result))
offset = 0;
result -= offset*60;
// If epoch 0 return epoch +1 which is Thu, 01-Jan-70 00:00:01 GMT
// This is so that parse error and valid epoch 0 return values won't
// be the same for sensitive applications...
if (result < 1) result = 1;
return result;
}
int KRFCDate::localUTCOffset()
{
time_t timeNow = time((time_t*) 0);
tm *tM = gmtime(&timeNow);
unsigned int timeUTC = ymdhms_to_seconds(tM->tm_year+1900, tM->tm_mon+1, tM->tm_mday,
tM->tm_hour, tM->tm_min, tM->tm_sec);
tM = localtime(&timeNow);
unsigned int timeLocal = ymdhms_to_seconds(tM->tm_year+1900, tM->tm_mon+1, tM->tm_mday,
tM->tm_hour, tM->tm_min, tM->tm_sec);
return ((int)(timeLocal-timeUTC))/60;
}
static const char * const day_names[] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char * const month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
QCString KRFCDate::rfc2822DateString(time_t utcTime, int utcOffset)
{
utcTime += utcOffset * 60;
tm *tM = gmtime(&utcTime);
char sgn = (utcOffset < 0) ? '-' : '+';
int z = (utcOffset < 0) ? -utcOffset : utcOffset;
QCString dateStr;
dateStr.sprintf("%s, %02d %s %04d %02d:%02d:%02d %c%02d%02d",
day_names[tM->tm_wday], tM->tm_mday,
month_names[tM->tm_mon], tM->tm_year+1900,
tM->tm_hour, tM->tm_min, tM->tm_sec,
sgn, z/60%24, z%60);
return dateStr;
}
QCString KRFCDate::rfc2822DateString(time_t utcTime)
{
return rfc2822DateString(utcTime, localUTCOffset());
}
KRFCDate::localUTCOffset
static int localUTCOffset()
Returns the local timezone offset to UTC in minutes.
Definition: krfcdate.cpp:458
KRFCDate::parseDateISO8601
static time_t parseDateISO8601(const QString &date)
This function tries to parse a string containing a date/time in any of the formats specified by http:...
Definition: krfcdate.cpp:343
KRFCDate::parseDate
static time_t parseDate(const QString &date)
This function tries to parse a string containing a date/time in any of the formats specified by RFC82...
Definition: krfcdate.cpp:98
KRFCDate::rfc2822DateString
static QCString rfc2822DateString(time_t utcTime, int utcOffset)
Returns a string representation of the given date and time formated in conformance to RFC2822...
Definition: krfcdate.cpp:484

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