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notifications-for-youtube/ISO8601DateFormatter/ISO8601DateFormatter.m
Kim Wittenburg 15062dfb27 Archive Project
2017-07-25 17:21:13 +02:00

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/*ISO8601DateFormatter.m
*
*Created by Peter Hosey on 2009-04-11.
*Copyright 2009 Peter Hosey. All rights reserved.
*/
#import <Foundation/Foundation.h>
#import "ISO8601DateFormatter.h"
#ifndef DEFAULT_TIME_SEPARATOR
# define DEFAULT_TIME_SEPARATOR ':'
#endif
unichar ISO8601DefaultTimeSeparatorCharacter = DEFAULT_TIME_SEPARATOR;
//Unicode date formats.
#define ISO_CALENDAR_DATE_FORMAT @"yyyy-MM-dd"
//#define ISO_WEEK_DATE_FORMAT @"YYYY-'W'ww-ee" //Doesn't actually work because NSDateComponents counts the weekday starting at 1.
#define ISO_ORDINAL_DATE_FORMAT @"yyyy-DDD"
#define ISO_TIME_FORMAT @"HH:mm:ss"
#define ISO_TIME_WITH_TIMEZONE_FORMAT ISO_TIME_FORMAT @"Z"
//printf formats.
#define ISO_TIMEZONE_UTC_FORMAT @"Z"
#define ISO_TIMEZONE_OFFSET_FORMAT @"%+.2d%.2d"
@interface ISO8601DateFormatter(UnparsingPrivate)
- (NSString *) replaceColonsInString:(NSString *)timeFormat withTimeSeparator:(unichar)timeSep;
- (NSString *) stringFromDate:(NSDate *)date formatString:(NSString *)dateFormat timeZone:(NSTimeZone *)timeZone;
- (NSString *) weekDateStringForDate:(NSDate *)date timeZone:(NSTimeZone *)timeZone;
@end
static NSMutableDictionary *timeZonesByOffset;
@implementation ISO8601DateFormatter
+ (void) initialize {
if (!timeZonesByOffset) {
timeZonesByOffset = [[NSMutableDictionary alloc] init];
}
}
+ (void) purgeGlobalCaches {
NSMutableDictionary *oldCache = timeZonesByOffset;
timeZonesByOffset = nil;
[oldCache release];
}
- (NSCalendar *) makeCalendarWithDesiredConfiguration {
NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
calendar.firstWeekday = 2; //Monday
calendar.timeZone = [NSTimeZone defaultTimeZone];
return calendar;
}
- (id) init {
if ((self = [super init])) {
parsingCalendar = [[self makeCalendarWithDesiredConfiguration] retain];
unparsingCalendar = [[self makeCalendarWithDesiredConfiguration] retain];
format = ISO8601DateFormatCalendar;
timeSeparator = ISO8601DefaultTimeSeparatorCharacter;
includeTime = NO;
parsesStrictly = NO;
}
return self;
}
- (void) dealloc {
[defaultTimeZone release];
[unparsingFormatter release];
[lastUsedFormatString release];
[parsingCalendar release];
[unparsingCalendar release];
[super dealloc];
}
@synthesize defaultTimeZone;
- (void) setDefaultTimeZone:(NSTimeZone *)tz {
if (defaultTimeZone != tz) {
[defaultTimeZone release];
defaultTimeZone = [tz retain];
unparsingCalendar.timeZone = defaultTimeZone;
}
}
//The following properties are only here because GCC doesn't like @synthesize in category implementations.
#pragma mark Parsing
@synthesize parsesStrictly;
static NSUInteger read_segment(const unsigned char *str, const unsigned char **next, NSUInteger *out_num_digits);
static NSUInteger read_segment_4digits(const unsigned char *str, const unsigned char **next, NSUInteger *out_num_digits);
static NSUInteger read_segment_2digits(const unsigned char *str, const unsigned char **next);
static double read_double(const unsigned char *str, const unsigned char **next);
static BOOL is_leap_year(NSUInteger year);
/*Valid ISO 8601 date formats:
*
*YYYYMMDD
*YYYY-MM-DD
*YYYY-MM
*YYYY
*YY //century
* //Implied century: YY is 00-99
* YYMMDD
* YY-MM-DD
* -YYMM
* -YY-MM
* -YY
* //Implied year
* --MMDD
* --MM-DD
* --MM
* //Implied year and month
* ---DD
* //Ordinal dates: DDD is the number of the day in the year (1-366)
*YYYYDDD
*YYYY-DDD
* YYDDD
* YY-DDD
* -DDD
* //Week-based dates: ww is the number of the week, and d is the number (1-7) of the day in the week
*yyyyWwwd
*yyyy-Www-d
*yyyyWww
*yyyy-Www
*yyWwwd
*yy-Www-d
*yyWww
*yy-Www
* //Year of the implied decade
*-yWwwd
*-y-Www-d
*-yWww
*-y-Www
* //Week and day of implied year
* -Wwwd
* -Www-d
* //Week only of implied year
* -Www
* //Day only of implied week
* -W-d
*/
- (NSDateComponents *) dateComponentsFromString:(NSString *)string {
return [self dateComponentsFromString:string timeZone:NULL];
}
- (NSDateComponents *) dateComponentsFromString:(NSString *)string timeZone:(out NSTimeZone **)outTimeZone {
return [self dateComponentsFromString:string timeZone:outTimeZone range:NULL];
}
- (NSDateComponents *) dateComponentsFromString:(NSString *)string timeZone:(out NSTimeZone **)outTimeZone range:(out NSRange *)outRange {
NSDate *now = [NSDate date];
NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
NSDateComponents *nowComponents = [parsingCalendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:now];
NSUInteger
//Date
year,
month_or_week = 0U,
day = 0U,
//Time
hour = 0U;
NSTimeInterval
minute = 0.0,
second = 0.0;
//Time zone
NSInteger tz_hour = 0;
NSInteger tz_minute = 0;
enum {
monthAndDate,
week,
dateOnly
} dateSpecification = monthAndDate;
BOOL strict = self.parsesStrictly;
unichar timeSep = self.timeSeparator;
if (strict) timeSep = ISO8601DefaultTimeSeparatorCharacter;
NSAssert(timeSep != '\0', @"Time separator must not be NUL.");
BOOL isValidDate = ([string length] > 0U);
NSTimeZone *timeZone = nil;
const unsigned char *ch = (const unsigned char *)[string UTF8String];
NSRange range = { 0U, 0U };
const unsigned char *start_of_date = NULL;
if (strict && isspace(*ch)) {
range.location = NSNotFound;
isValidDate = NO;
} else {
//Skip leading whitespace.
NSUInteger i = 0U;
for(NSUInteger len = strlen((const char *)ch); i < len; ++i) {
if (!isspace(ch[i]))
break;
}
range.location = i;
ch += i;
start_of_date = ch;
NSUInteger segment;
NSUInteger num_leading_hyphens = 0U, num_digits = 0U;
if (*ch == 'T') {
//There is no date here, only a time. Set the date to now; then we'll parse the time.
isValidDate = isdigit(*++ch);
year = nowComponents.year;
month_or_week = nowComponents.month;
day = nowComponents.day;
} else {
while(*ch == '-') {
++num_leading_hyphens;
++ch;
}
segment = read_segment(ch, &ch, &num_digits);
switch(num_digits) {
case 0:
if (*ch == 'W') {
if ((ch[1] == '-') && isdigit(ch[2]) && ((num_leading_hyphens == 1U) || ((num_leading_hyphens == 2U) && !strict))) {
year = nowComponents.year;
month_or_week = 1U;
ch += 2;
goto parseDayAfterWeek;
} else if (num_leading_hyphens == 1U) {
year = nowComponents.year;
goto parseWeekAndDay;
} else
isValidDate = NO;
} else
isValidDate = NO;
break;
case 8: //YYYY MM DD
if (num_leading_hyphens > 0U)
isValidDate = NO;
else {
day = segment % 100U;
segment /= 100U;
month_or_week = segment % 100U;
year = segment / 100U;
}
break;
case 6: //YYMMDD (implicit century)
if (num_leading_hyphens > 0U)
isValidDate = NO;
else {
day = segment % 100U;
segment /= 100U;
month_or_week = segment % 100U;
year = nowComponents.year;
year -= (year % 100U);
year += segment / 100U;
}
break;
case 4:
switch(num_leading_hyphens) {
case 0: //YYYY
year = segment;
if (*ch == '-') ++ch;
if (!isdigit(*ch)) {
if (*ch == 'W')
goto parseWeekAndDay;
else
month_or_week = day = 1U;
} else {
segment = read_segment(ch, &ch, &num_digits);
switch(num_digits) {
case 4: //MMDD
day = segment % 100U;
month_or_week = segment / 100U;
break;
case 2: //MM
month_or_week = segment;
if (*ch == '-') ++ch;
if (!isdigit(*ch))
day = 1U;
else
day = read_segment(ch, &ch, NULL);
break;
case 3: //DDD
day = segment % 1000U;
dateSpecification = dateOnly;
if (strict && (day > (365U + is_leap_year(year))))
isValidDate = NO;
break;
default:
isValidDate = NO;
}
}
break;
case 1: //YYMM
month_or_week = segment % 100U;
year = segment / 100U;
if (*ch == '-') ++ch;
if (!isdigit(*ch))
day = 1U;
else
day = read_segment(ch, &ch, NULL);
break;
case 2: //MMDD
day = segment % 100U;
month_or_week = segment / 100U;
year = nowComponents.year;
break;
default:
isValidDate = NO;
} //switch(num_leading_hyphens) (4 digits)
break;
case 1:
if (strict) {
//Two digits only - never just one.
if (num_leading_hyphens == 1U) {
if (*ch == '-') ++ch;
if (*++ch == 'W') {
year = nowComponents.year;
year -= (year % 10U);
year += segment;
goto parseWeekAndDay;
} else
isValidDate = NO;
} else
isValidDate = NO;
break;
}
case 2:
switch(num_leading_hyphens) {
case 0:
if (*ch == '-') {
//Implicit century
year = nowComponents.year;
year -= (year % 100U);
year += segment;
if (*++ch == 'W')
goto parseWeekAndDay;
else if (!isdigit(*ch)) {
goto centuryOnly;
} else {
//Get month and/or date.
segment = read_segment_4digits(ch, &ch, &num_digits);
NSLog(@"(%@) parsing month; segment is %lu and ch is %s", string, (unsigned long)segment, ch);
switch(num_digits) {
case 4: //YY-MMDD
day = segment % 100U;
month_or_week = segment / 100U;
break;
case 1: //YY-M; YY-M-DD (extension)
if (strict) {
isValidDate = NO;
break;
}
case 2: //YY-MM; YY-MM-DD
month_or_week = segment;
if (*ch == '-') {
if (isdigit(*++ch))
day = read_segment_2digits(ch, &ch);
else
day = 1U;
} else
day = 1U;
break;
case 3: //Ordinal date.
day = segment;
dateSpecification = dateOnly;
break;
}
}
} else if (*ch == 'W') {
year = nowComponents.year;
year -= (year % 100U);
year += segment;
parseWeekAndDay: //*ch should be 'W' here.
if (!isdigit(*++ch)) {
//Not really a week-based date; just a year followed by '-W'.
if (strict)
isValidDate = NO;
else
month_or_week = day = 1U;
} else {
month_or_week = read_segment_2digits(ch, &ch);
if (*ch == '-') ++ch;
parseDayAfterWeek:
day = isdigit(*ch) ? read_segment_2digits(ch, &ch) : 1U;
dateSpecification = week;
}
} else {
//Century only. Assume current year.
centuryOnly:
year = segment * 100U + nowComponents.year % 100U;
month_or_week = day = 1U;
}
break;
case 1:; //-YY; -YY-MM (implicit century)
NSLog(@"(%@) found %lu digits and one hyphen, so this is either -YY or -YY-MM; segment (year) is %lu", string, (unsigned long)num_digits, (unsigned long)segment);
NSUInteger current_year = nowComponents.year;
NSUInteger current_century = (current_year % 100U);
year = segment + (current_year - current_century);
if (num_digits == 1U) //implied decade
year += current_century - (current_year % 10U);
if (*ch == '-') {
++ch;
month_or_week = read_segment_2digits(ch, &ch);
NSLog(@"(%@) month is %lu", string, (unsigned long)month_or_week);
}
day = 1U;
break;
case 2: //--MM; --MM-DD
year = nowComponents.year;
month_or_week = segment;
if (*ch == '-') {
++ch;
day = read_segment_2digits(ch, &ch);
}
break;
case 3: //---DD
year = nowComponents.year;
month_or_week = nowComponents.month;
day = segment;
break;
default:
isValidDate = NO;
} //switch(num_leading_hyphens) (2 digits)
break;
case 7: //YYYY DDD (ordinal date)
if (num_leading_hyphens > 0U)
isValidDate = NO;
else {
day = segment % 1000U;
year = segment / 1000U;
dateSpecification = dateOnly;
if (strict && (day > (365U + is_leap_year(year))))
isValidDate = NO;
}
break;
case 3: //--DDD (ordinal date, implicit year)
//Technically, the standard only allows one hyphen. But it says that two hyphens is the logical implementation, and one was dropped for brevity. So I have chosen to allow the missing hyphen.
if ((num_leading_hyphens < 1U) || ((num_leading_hyphens > 2U) && !strict))
isValidDate = NO;
else {
day = segment;
year = nowComponents.year;
dateSpecification = dateOnly;
if (strict && (day > (365U + is_leap_year(year))))
isValidDate = NO;
}
break;
default:
isValidDate = NO;
}
}
if (isValidDate) {
if (isspace(*ch) || (*ch == 'T')) ++ch;
if (isdigit(*ch)) {
hour = read_segment_2digits(ch, &ch);
if (*ch == timeSep) {
++ch;
if ((timeSep == ',') || (timeSep == '.')) {
//We can't do fractional minutes when '.' is the segment separator.
//Only allow whole minutes and whole seconds.
minute = read_segment_2digits(ch, &ch);
if (*ch == timeSep) {
++ch;
second = read_segment_2digits(ch, &ch);
}
} else {
//Allow a fractional minute.
//If we don't get a fraction, look for a seconds segment.
//Otherwise, the fraction of a minute is the seconds.
minute = read_double(ch, &ch);
second = modf(minute, &minute);
if (second > DBL_EPSILON)
second *= 60.0; //Convert fraction (e.g. .5) into seconds (e.g. 30).
else if (*ch == timeSep) {
++ch;
second = read_double(ch, &ch);
}
}
}
if (!strict) {
if (isspace(*ch)) ++ch;
}
switch(*ch) {
case 'Z':
timeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];
break;
case '+':
case '-':;
BOOL negative = (*ch == '-');
if (isdigit(*++ch)) {
//Read hour offset.
segment = *ch - '0';
if (isdigit(*++ch)) {
segment *= 10U;
segment += *(ch++) - '0';
}
tz_hour = (NSInteger)segment;
if (negative) tz_hour = -tz_hour;
//Optional separator.
if (*ch == timeSep) ++ch;
if (isdigit(*ch)) {
//Read minute offset.
segment = *ch - '0';
if (isdigit(*++ch)) {
segment *= 10U;
segment += *ch - '0';
}
tz_minute = segment;
if (negative) tz_minute = -tz_minute;
}
NSTimeInterval timeZoneOffset = (tz_hour * 3600) + (tz_minute * 60);
NSNumber *offsetNum = [NSNumber numberWithDouble:timeZoneOffset];
timeZone = [timeZonesByOffset objectForKey:offsetNum];
if (!timeZone) {
timeZone = [NSTimeZone timeZoneForSecondsFromGMT:timeZoneOffset];
if (timeZone)
[timeZonesByOffset setObject:timeZone forKey:offsetNum];
}
}
}
}
}
if (isValidDate) {
components.year = year;
components.day = day;
components.hour = hour;
components.minute = (NSInteger)minute;
components.second = (NSInteger)second;
switch(dateSpecification) {
case monthAndDate:
components.month = month_or_week;
break;
case week:;
//Adapted from <http://personal.ecu.edu/mccartyr/ISOwdALG.txt>.
//This works by converting the week date into an ordinal date, then letting the next case handle it.
NSUInteger prevYear = year - 1U;
NSUInteger YY = prevYear % 100U;
NSUInteger C = prevYear - YY;
NSUInteger G = YY + YY / 4U;
NSUInteger isLeapYear = (((C / 100U) % 4U) * 5U);
NSUInteger Jan1Weekday = (isLeapYear + G) % 7U;
enum { monday, tuesday, wednesday, thursday/*, friday, saturday, sunday*/ };
components.day = ((8U - Jan1Weekday) + (7U * (Jan1Weekday > thursday))) + (day - 1U) + (7U * (month_or_week - 2));
case dateOnly: //An "ordinal date".
break;
}
}
} //if (!(strict && isdigit(ch[0])))
if (outRange) {
if (isValidDate)
range.length = ch - start_of_date;
else
range.location = NSNotFound;
*outRange = range;
}
if (outTimeZone) {
*outTimeZone = timeZone;
}
return components;
}
- (NSDate *) dateFromString:(NSString *)string {
return [self dateFromString:string timeZone:NULL];
}
- (NSDate *) dateFromString:(NSString *)string timeZone:(out NSTimeZone **)outTimeZone {
return [self dateFromString:string timeZone:outTimeZone range:NULL];
}
- (NSDate *) dateFromString:(NSString *)string timeZone:(out NSTimeZone **)outTimeZone range:(out NSRange *)outRange {
NSTimeZone *timeZone = nil;
NSDateComponents *components = [self dateComponentsFromString:string timeZone:&timeZone range:outRange];
if (outTimeZone)
*outTimeZone = timeZone;
parsingCalendar.timeZone = timeZone;
return [parsingCalendar dateFromComponents:components];
}
- (BOOL)getObjectValue:(id *)outValue forString:(NSString *)string errorDescription:(NSString **)error {
NSDate *date = [self dateFromString:string];
if (outValue)
*outValue = date;
return (date != nil);
}
#pragma mark Unparsing
@synthesize format;
@synthesize includeTime;
@synthesize timeSeparator;
- (NSString *) replaceColonsInString:(NSString *)timeFormat withTimeSeparator:(unichar)timeSep {
if (timeSep != ':') {
NSMutableString *timeFormatMutable = [[timeFormat mutableCopy] autorelease];
[timeFormatMutable replaceOccurrencesOfString:@":"
withString:[NSString stringWithCharacters:&timeSep length:1U]
options:NSBackwardsSearch | NSLiteralSearch
range:(NSRange){ 0UL, [timeFormat length] }];
timeFormat = timeFormatMutable;
}
return timeFormat;
}
- (NSString *) stringFromDate:(NSDate *)date {
NSTimeZone *timeZone = self.defaultTimeZone;
if (!timeZone) timeZone = [NSTimeZone defaultTimeZone];
return [self stringFromDate:date timeZone:timeZone];
}
- (NSString *) stringFromDate:(NSDate *)date timeZone:(NSTimeZone *)timeZone {
switch (self.format) {
case ISO8601DateFormatCalendar:
return [self stringFromDate:date formatString:ISO_CALENDAR_DATE_FORMAT timeZone:timeZone];
case ISO8601DateFormatWeek:
return [self weekDateStringForDate:date timeZone:timeZone];
case ISO8601DateFormatOrdinal:
return [self stringFromDate:date formatString:ISO_ORDINAL_DATE_FORMAT timeZone:timeZone];
default:
[NSException raise:NSInternalInconsistencyException format:@"self.format was %ld, not calendar (%d), week (%d), or ordinal (%d)", self.format, ISO8601DateFormatCalendar, ISO8601DateFormatWeek, ISO8601DateFormatOrdinal];
return nil;
}
}
- (NSString *) stringFromDate:(NSDate *)date formatString:(NSString *)dateFormat timeZone:(NSTimeZone *)timeZone {
if (includeTime)
dateFormat = [dateFormat stringByAppendingFormat:@"'T'%@", [self replaceColonsInString:ISO_TIME_FORMAT withTimeSeparator:self.timeSeparator]];
unparsingCalendar.timeZone = timeZone;
if (dateFormat != lastUsedFormatString) {
[unparsingFormatter release];
unparsingFormatter = nil;
[lastUsedFormatString release];
lastUsedFormatString = [dateFormat retain];
}
if (!unparsingFormatter) {
unparsingFormatter = [[NSDateFormatter alloc] init];
unparsingFormatter.formatterBehavior = NSDateFormatterBehavior10_4;
unparsingFormatter.dateFormat = dateFormat;
unparsingFormatter.calendar = unparsingCalendar;
}
NSString *str = [unparsingFormatter stringForObjectValue:date];
if (includeTime) {
NSInteger offset = [timeZone secondsFromGMT];
offset /= 60; //bring down to minutes
if (offset == 0)
str = [str stringByAppendingString:ISO_TIMEZONE_UTC_FORMAT];
else
str = [str stringByAppendingFormat:ISO_TIMEZONE_OFFSET_FORMAT, offset / 60, offset % 60];
}
//Undo the change we made earlier
unparsingCalendar.timeZone = self.defaultTimeZone;
return str;
}
- (NSString *) stringForObjectValue:(id)value {
NSParameterAssert([value isKindOfClass:[NSDate class]]);
return [self stringFromDate:(NSDate *)value];
}
/*Adapted from:
* Algorithm for Converting Gregorian Dates to ISO 8601 Week Date
* Rick McCarty, 1999
* http://personal.ecu.edu/mccartyr/ISOwdALG.txt
*/
- (NSString *) weekDateStringForDate:(NSDate *)date timeZone:(NSTimeZone *)timeZone {
unparsingCalendar.timeZone = timeZone;
NSDateComponents *components = [unparsingCalendar components:NSYearCalendarUnit | NSWeekdayCalendarUnit | NSDayCalendarUnit fromDate:date];
//Determine the ordinal date.
NSDateComponents *startOfYearComponents = [unparsingCalendar components:NSYearCalendarUnit fromDate:date];
startOfYearComponents.month = 1;
startOfYearComponents.day = 1;
NSDateComponents *ordinalComponents = [unparsingCalendar components:NSDayCalendarUnit fromDate:[unparsingCalendar dateFromComponents:startOfYearComponents] toDate:date options:0];
ordinalComponents.day += 1;
enum {
monday, tuesday, wednesday, thursday, friday, saturday, sunday
};
enum {
january = 1, february, march,
april, may, june,
july, august, september,
october, november, december
};
NSInteger year = components.year;
NSInteger week = 0;
//The old unparser added 6 to [calendarDate dayOfWeek], which was zero-based; components.weekday is one-based, so we now add only 5.
NSInteger dayOfWeek = (components.weekday + 5) % 7;
NSInteger dayOfYear = ordinalComponents.day;
NSInteger prevYear = year - 1;
BOOL yearIsLeapYear = is_leap_year(year);
BOOL prevYearIsLeapYear = is_leap_year(prevYear);
NSInteger YY = prevYear % 100;
NSInteger C = prevYear - YY;
NSInteger G = YY + YY / 4;
NSInteger Jan1Weekday = (((((C / 100) % 4) * 5) + G) % 7);
NSInteger weekday = ((dayOfYear + Jan1Weekday) - 1) % 7;
if((dayOfYear <= (7 - Jan1Weekday)) && (Jan1Weekday > thursday)) {
week = 52 + ((Jan1Weekday == friday) || ((Jan1Weekday == saturday) && prevYearIsLeapYear));
--year;
} else {
NSInteger lengthOfYear = 365 + yearIsLeapYear;
if((lengthOfYear - dayOfYear) < (thursday - weekday)) {
++year;
week = 1;
} else {
NSInteger J = dayOfYear + (sunday - weekday) + Jan1Weekday;
week = J / 7 - (Jan1Weekday > thursday);
}
}
NSString *timeString;
if(includeTime) {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
unichar timeSep = self.timeSeparator;
if (!timeSep) timeSep = ISO8601DefaultTimeSeparatorCharacter;
formatter.dateFormat = [self replaceColonsInString:ISO_TIME_WITH_TIMEZONE_FORMAT withTimeSeparator:timeSep];
timeString = [formatter stringForObjectValue:date];
[formatter release];
} else
timeString = @"";
return [NSString stringWithFormat:@"%lu-W%02lu-%02lu%@", (unsigned long)year, (unsigned long)week, ((unsigned long)dayOfWeek) + 1U, timeString];
}
@end
static NSUInteger read_segment(const unsigned char *str, const unsigned char **next, NSUInteger *out_num_digits) {
NSUInteger num_digits = 0U;
NSUInteger value = 0U;
while(isdigit(*str)) {
value *= 10U;
value += *str - '0';
++num_digits;
++str;
}
if (next) *next = str;
if (out_num_digits) *out_num_digits = num_digits;
return value;
}
static NSUInteger read_segment_4digits(const unsigned char *str, const unsigned char **next, NSUInteger *out_num_digits) {
NSUInteger num_digits = 0U;
NSUInteger value = 0U;
if (isdigit(*str)) {
value += *(str++) - '0';
++num_digits;
}
if (isdigit(*str)) {
value *= 10U;
value += *(str++) - '0';
++num_digits;
}
if (isdigit(*str)) {
value *= 10U;
value += *(str++) - '0';
++num_digits;
}
if (isdigit(*str)) {
value *= 10U;
value += *(str++) - '0';
++num_digits;
}
if (next) *next = str;
if (out_num_digits) *out_num_digits = num_digits;
return value;
}
static NSUInteger read_segment_2digits(const unsigned char *str, const unsigned char **next) {
NSUInteger value = 0U;
if (isdigit(*str))
value += *str - '0';
if (isdigit(*++str)) {
value *= 10U;
value += *(str++) - '0';
}
if (next) *next = str;
return value;
}
//strtod doesn't support ',' as a separator. This does.
static double read_double(const unsigned char *str, const unsigned char **next) {
double value = 0.0;
if (str) {
NSUInteger int_value = 0;
while(isdigit(*str)) {
int_value *= 10U;
int_value += (*(str++) - '0');
}
value = int_value;
if (((*str == ',') || (*str == '.'))) {
++str;
register double multiplier, multiplier_multiplier;
multiplier = multiplier_multiplier = 0.1;
while(isdigit(*str)) {
value += (*(str++) - '0') * multiplier;
multiplier *= multiplier_multiplier;
}
}
}
if (next) *next = str;
return value;
}
static BOOL is_leap_year(NSUInteger year) {
return \
((year % 4U) == 0U)
&& (((year % 100U) != 0U)
|| ((year % 400U) == 0U));
}
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