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Diffstat (limited to 'libkcal/libical/src/libical/icalrecur.c')
| -rw-r--r-- | libkcal/libical/src/libical/icalrecur.c | 2400 |
1 files changed, 2400 insertions, 0 deletions
diff --git a/libkcal/libical/src/libical/icalrecur.c b/libkcal/libical/src/libical/icalrecur.c new file mode 100644 index 00000000..acd2ccce --- /dev/null +++ b/libkcal/libical/src/libical/icalrecur.c @@ -0,0 +1,2400 @@ +/* -*- Mode: C -*- + ====================================================================== + FILE: icalrecur.c + CREATOR: eric 16 May 2000 + + + + (C) COPYRIGHT 2000, Eric Busboom <eric@softwarestudio.org> + http://www.softwarestudio.org + + This program is free software; you can redistribute it and/or modify + it under the terms of either: + + The LGPL as published by the Free Software Foundation, version + 2.1, available at: http://www.fsf.org/copyleft/lesser.html + + Or: + + The Mozilla Public License Version 1.0. You may obtain a copy of + the License at http://www.mozilla.org/MPL/ +*/ + +/** + @file icalrecur.c + @brief Implementation of routines for dealing with recurring time + + How this code works: + + Processing starts when the caller generates a new recurrence + iterator via icalrecur_iterator_new(). This routine copies the + recurrence rule into the iterator and extracts things like start and + end dates. Then, it checks if the rule is legal, using some logic + from RFC2445 and some logic that probably should be in RFC2445. + + Then, icalrecur_iterator_new() re-writes some of the BY* + arrays. This involves ( via a call to setup_defaults() ) : + + 1) For BY rule parts with no data ( ie BYSECOND was not specified ) + copy the corresponding time part from DTSTART into the BY array. ( + So impl->by_ptrs[BY_SECOND] will then have one element if is + originally had none ) This only happens if the BY* rule part data + would expand the number of occurrences in the occurrence set. This + lets the code ignore DTSTART later on and still use it to get the + time parts that were not specified in any other way. + + 2) For the by rule part that are not the same interval as the + frequency -- for HOURLY anything but BYHOUR, for instance -- copy the + first data element from the rule part into the first occurrence. For + example, for "INTERVAL=MONTHLY and BYHOUR=10,30", initialize the + first time to be returned to have an hour of 10. + + Finally, for INTERVAL=YEARLY, the routine expands the rule to get + all of the days specified in the rule. The code will do this for + each new year, and this is the first expansion. This is a special + case for the yearly interval; no other frequency gets expanded this + way. The yearly interval is the most complex, so some special + processing is required. + + After creating a new iterator, the caller will make successive calls + to icalrecur_iterator_next() to get the next time specified by the + rule. The main part of this routine is a switch on the frequency of + the rule. Each different frequency is handled by a different + routine. + + For example, next_hour handles the case of INTERVAL=HOURLY, and it + is called by other routines to get the next hour. First, the routine + tries to get the next minute part of a time with a call to + next_minute(). If next_minute() returns 1, it has reached the end of + its data, usually the last element of the BYMINUTE array. Then, if + there is data in the BYHOUR array, the routine changes the hour to + the next one in the array. If INTERVAL=HOURLY, the routine advances + the hour by the interval. + + If the routine used the last hour in the BYHOUR array, and the + INTERVAL=HOURLY, then the routine calls increment_monthday() to set + the next month day. The increment_* routines may call higher routine + to increment the month or year also. + + The code for INTERVAL=DAILY is handled by next_day(). First, the + routine tries to get the next hour part of a time with a call to + next_hour. If next_hour() returns 1, it has reached the end of its + data, usually the last element of the BYHOUR array. This means that + next_day() should increment the time to the next day. If FREQUENCY==DAILY, + the routine increments the day by the interval; otherwise, it + increments the day by 1. + + Next_day() differs from next_hour because it does not use the BYDAY + array to select an appropriate day. Instead, it returns every day ( + incrementing by 1 if the frequency is not DAILY with INTERVAL!=1) + Any days that are not specified in an non-empty BYDAY array are + filtered out later. + + Generally, the flow of these routine is for a next_* call a next_* + routine of a lower interval ( next_day calls next_hour) and then to + possibly call an increment_* routine of an equal or higher + interval. ( next_day calls increment_monthday() ) + + When the call to the original next_* routine returns, + icalrecur_iterator_next() will check the returned data against other + BYrule parts to determine if is should be excluded by calling + check_contracting_rules. Generally, a contracting rule is any with a + larger time span than the interval. For instance, if + INTERVAL=DAILY, BYMONTH is a contracting rule part. + + Check_contracting_rules() uses icalrecur_check_rulepart() to do its + work. icalrecur_check_rulepart() uses expand_map[] to determine if a rule + is contracting, and if it is, and if the BY rule part has some data, + then the routine checks if the value of a component of the time is + part of the byrule part. For instance, for "INTERVAL=DAILY; + BYMONTH=6,10", icalrecur_check_rulepart() would check that the time value + given to it has a month of either 6 or 10. + + Finally, icalrecur_iterator_next() does a few other checks on the + time value, and if it passes, it returns the time. + + A note about the end_of_data flag. The flag indicates that the + routine is at the end of its data -- the last BY rule if the routine + is using by rules, or the last day of the week/month/year/etc if + not. + + This flag is usually set early in a next_* routine and returned in + the end. The way it is used allows the next_* routine to set the + last time back to the first element in a BYxx rule, and then signal + to the higer level routine to increment the next higher level. For + instance. WITH FREQ=MONTHLY;BYDAY=TU,FR, After next_weekday_by_month + runs though both TU and FR, it sets the week day back to TU and sets + end_of_data to 1x. This signals next_month to increment the month. + + + ======================================================================*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#ifdef HAVE_STDINT_H +#include <stdint.h> +#endif + +#include "icalrecur.h" + +#include "icalerror.h" +#include "icalmemory.h" + +#include <stdlib.h> /* for malloc */ +#include <errno.h> /* for errno */ +#include <string.h> /* for strdup and strchr*/ +#include <assert.h> +#include <stddef.h> /* For offsetof() macro */ + +#include "pvl.h" + +/** This is the last year we will go up to, since 32-bit time_t values + only go up to the start of 2038. */ +#define MAX_TIME_T_YEAR 2037 + +#define TEMP_MAX 1024 + + +#define BYDAYIDX impl->by_indices[BY_DAY] +#define BYDAYPTR impl->by_ptrs[BY_DAY] + +#define BYMONIDX impl->by_indices[BY_MONTH] +#define BYMONPTR impl->by_ptrs[BY_MONTH] + +#define BYMDIDX impl->by_indices[BY_MONTH_DAY] +#define BYMDPTR impl->by_ptrs[BY_MONTH_DAY] + +#define BYWEEKIDX impl->by_indices[BY_WEEK_NO] +#define BYWEEKPTR impl->by_ptrs[BY_WEEK_NO] + +const char* icalrecur_freq_to_string(icalrecurrencetype_frequency kind); +icalrecurrencetype_frequency icalrecur_string_to_freq(const char* str); + +const char* icalrecur_weekday_to_string(icalrecurrencetype_weekday kind); +icalrecurrencetype_weekday icalrecur_string_to_weekday(const char* str); + + +/*********************** Rule parsing routines ************************/ + +struct icalrecur_parser { + const char* rule; + char* copy; + char* this_clause; + char* next_clause; + + struct icalrecurrencetype rt; +}; + +const char* icalrecur_first_clause(struct icalrecur_parser *parser) +{ + char *idx; + parser->this_clause = parser->copy; + + idx = strchr(parser->this_clause,';'); + + if (idx == 0){ + parser->next_clause = 0; + return 0; + } + + *idx = 0; + idx++; + parser->next_clause = idx; + + return parser->this_clause; + +} + +const char* icalrecur_next_clause(struct icalrecur_parser *parser) +{ + char* idx; + + parser->this_clause = parser->next_clause; + + if(parser->this_clause == 0){ + return 0; + } + + idx = strchr(parser->this_clause,';'); + + if (idx == 0){ + parser->next_clause = 0; + } else { + + *idx = 0; + idx++; + parser->next_clause = idx; + } + + return parser->this_clause; + +} + +void icalrecur_clause_name_and_value(struct icalrecur_parser *parser, + char** name, char** value) +{ + char *idx; + + *name = parser->this_clause; + + idx = strchr(parser->this_clause,'='); + + if (idx == 0){ + *name = 0; + *value = 0; + return; + } + + *idx = 0; + idx++; + *value = idx; +} + +void icalrecur_add_byrules(struct icalrecur_parser *parser, short *array, + int size, char* vals) +{ + char *t, *n; + int i=0; + int sign = 1; + int v; + (void)parser; + + n = vals; + + while(n != 0){ + + if(i == size){ + return; + } + + t = n; + + n = strchr(t,','); + + if(n != 0){ + *n = 0; + n++; + } + + /* Get optional sign. HACK. sign is not allowed for all BYxxx + rule parts */ + if( *t == '-'){ + sign = -1; + t++; + } else if (*t == '+'){ + sign = 1; + t++; + } else { + sign = 1; + } + + v = atoi(t) * sign ; + + + array[i++] = (short)v; + array[i] = ICAL_RECURRENCE_ARRAY_MAX; + + } + +} + +void icalrecur_add_bydayrules(struct icalrecur_parser *parser, const char* vals) +{ + + char *t, *n; + int i=0; + int sign = 1; + int weekno = 0; + icalrecurrencetype_weekday wd; + short *array = parser->rt.by_day; + char* end; + char* vals_copy; + + vals_copy = icalmemory_strdup(vals); + + end = (char*)vals_copy+strlen(vals_copy); + n = vals_copy; + + while(n != 0){ + + + t = n; + + n = strchr(t,','); + + if(n != 0){ + *n = 0; + n++; + } + + /* Get optional sign. */ + if( *t == '-'){ + sign = -1; + t++; + } else if (*t == '+'){ + sign = 1; + t++; + } else { + sign = 1; + } + + /* Get Optional weekno */ + weekno = strtol(t,&t,10); + + /* Outlook/Exchange generate "BYDAY=MO, FR" and "BYDAY=2 TH". + * Cope with that. + */ + if (*t == ' ') + t++; + + wd = icalrecur_string_to_weekday(t); + + array[i++] = (short)(sign* (wd + 8*weekno)); + array[i] = ICAL_RECURRENCE_ARRAY_MAX; + + } + + free(vals_copy); + +} + + +struct icalrecurrencetype icalrecurrencetype_from_string(const char* str) +{ + struct icalrecur_parser parser; + + memset(&parser,0,sizeof(parser)); + icalrecurrencetype_clear(&parser.rt); + + icalerror_check_arg_re(str!=0,"str",parser.rt); + + + /* Set up the parser struct */ + parser.rule = str; + parser.copy = icalmemory_strdup(parser.rule); + parser.this_clause = parser.copy; + + if(parser.copy == 0){ + icalerror_set_errno(ICAL_NEWFAILED_ERROR); + return parser.rt; + } + + /* Loop through all of the clauses */ + for(icalrecur_first_clause(&parser); + parser.this_clause != 0; + icalrecur_next_clause(&parser)) + { + char *name, *value; + icalrecur_clause_name_and_value(&parser,&name,&value); + + if(name == 0){ + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + icalrecurrencetype_clear(&parser.rt); + free(parser.copy); + return parser.rt; + } + + if (strcasecmp(name,"FREQ") == 0){ + parser.rt.freq = icalrecur_string_to_freq(value); + } else if (strcasecmp(name,"COUNT") == 0){ + parser.rt.count = atoi(value); + } else if (strcasecmp(name,"UNTIL") == 0){ + parser.rt.until = icaltime_from_string(value); + } else if (strcasecmp(name,"INTERVAL") == 0){ + parser.rt.interval = (short)atoi(value); + } else if (strcasecmp(name,"WKST") == 0){ + parser.rt.week_start = icalrecur_string_to_weekday(value); + } else if (strcasecmp(name,"BYSECOND") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_second, + ICAL_BY_SECOND_SIZE,value); + } else if (strcasecmp(name,"BYMINUTE") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_minute, + ICAL_BY_MINUTE_SIZE,value); + } else if (strcasecmp(name,"BYHOUR") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_hour, + ICAL_BY_HOUR_SIZE,value); + } else if (strcasecmp(name,"BYDAY") == 0){ + icalrecur_add_bydayrules(&parser,value); + } else if (strcasecmp(name,"BYMONTHDAY") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_month_day, + ICAL_BY_MONTHDAY_SIZE,value); + } else if (strcasecmp(name,"BYYEARDAY") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_year_day, + ICAL_BY_YEARDAY_SIZE,value); + } else if (strcasecmp(name,"BYWEEKNO") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_week_no, + ICAL_BY_WEEKNO_SIZE,value); + } else if (strcasecmp(name,"BYMONTH") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_month, + ICAL_BY_MONTH_SIZE,value); + } else if (strcasecmp(name,"BYSETPOS") == 0){ + icalrecur_add_byrules(&parser,parser.rt.by_set_pos, + ICAL_BY_SETPOS_SIZE,value); + } else { + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + icalrecurrencetype_clear(&parser.rt); + free(parser.copy); + return parser.rt; + } + + } + + free(parser.copy); + + return parser.rt; + +} + +static struct { const char* str;size_t offset; int limit; } recurmap[] = +{ + {";BYSECOND=",offsetof(struct icalrecurrencetype,by_second),60}, + {";BYMINUTE=",offsetof(struct icalrecurrencetype,by_minute),60}, + {";BYHOUR=",offsetof(struct icalrecurrencetype,by_hour),24}, + {";BYDAY=",offsetof(struct icalrecurrencetype,by_day),7}, + {";BYMONTHDAY=",offsetof(struct icalrecurrencetype,by_month_day),31}, + {";BYYEARDAY=",offsetof(struct icalrecurrencetype,by_year_day),366}, + {";BYWEEKNO=",offsetof(struct icalrecurrencetype,by_week_no),52}, + {";BYMONTH=",offsetof(struct icalrecurrencetype,by_month),12}, + {";BYSETPOS=",offsetof(struct icalrecurrencetype,by_set_pos),366}, + {0,0,0}, +}; + +/* A private routine in icalvalue.c */ +void print_date_to_string(char* str, struct icaltimetype *data); +void print_datetime_to_string(char* str, struct icaltimetype *data); + +char* icalrecurrencetype_as_string(struct icalrecurrencetype *recur) +{ + char* str; + char *str_p; + size_t buf_sz = 200; + char temp[20]; + int i,j; + + if(recur->freq == ICAL_NO_RECURRENCE){ + return 0; + } + + str = (char*)icalmemory_tmp_buffer(buf_sz); + str_p = str; + + icalmemory_append_string(&str,&str_p,&buf_sz,"FREQ="); + icalmemory_append_string(&str,&str_p,&buf_sz, + icalrecur_freq_to_string(recur->freq)); + + if(recur->until.year != 0){ + + temp[0] = 0; + if (recur->until.is_date) + print_date_to_string(temp,&(recur->until)); + else + print_datetime_to_string(temp,&(recur->until)); + + icalmemory_append_string(&str,&str_p,&buf_sz,";UNTIL="); + icalmemory_append_string(&str,&str_p,&buf_sz, temp); + } + + if(recur->count != 0){ + snprintf(temp,sizeof(temp),"%d",recur->count); + icalmemory_append_string(&str,&str_p,&buf_sz,";COUNT="); + icalmemory_append_string(&str,&str_p,&buf_sz, temp); + } + + if(recur->interval != 1){ + snprintf(temp,sizeof(temp),"%d",recur->interval); + icalmemory_append_string(&str,&str_p,&buf_sz,";INTERVAL="); + icalmemory_append_string(&str,&str_p,&buf_sz, temp); + } + + for(j =0; recurmap[j].str != 0; j++){ + short* array = (short*)(recurmap[j].offset+ (size_t)recur); + int limit = recurmap[j].limit; + + /* Skip unused arrays */ + if( array[0] != ICAL_RECURRENCE_ARRAY_MAX ) { + + icalmemory_append_string(&str,&str_p,&buf_sz,recurmap[j].str); + + for(i=0; + i< limit && array[i] != ICAL_RECURRENCE_ARRAY_MAX; + i++){ + if (j == 3) { /* BYDAY */ + const char *daystr = icalrecur_weekday_to_string( + icalrecurrencetype_day_day_of_week(array[i])); + int pos; + + pos = icalrecurrencetype_day_position(array[i]); + + if (pos == 0) + icalmemory_append_string(&str,&str_p,&buf_sz,daystr); + else { + snprintf(temp,sizeof(temp),"%d%s",pos,daystr); + icalmemory_append_string(&str,&str_p,&buf_sz,temp); + } + + } else { + snprintf(temp,sizeof(temp),"%d",array[i]); + icalmemory_append_string(&str,&str_p,&buf_sz, temp); + } + + if( (i+1)<limit &&array[i+1] + != ICAL_RECURRENCE_ARRAY_MAX){ + icalmemory_append_char(&str,&str_p,&buf_sz,','); + } + } + } + } + + /* Monday is the default, so no need to write that out */ + if ( recur->week_start != ICAL_MONDAY_WEEKDAY ) { + const char *daystr = icalrecur_weekday_to_string( + icalrecurrencetype_day_day_of_week( recur->week_start )); + icalmemory_append_string(&str,&str_p,&buf_sz,";WKST="); + icalmemory_append_string(&str,&str_p,&buf_sz,daystr); + } + + return str; +} + + +/************************* occurrence iteration routiens ******************/ + +enum byrule { + NO_CONTRACTION = -1, + BY_SECOND = 0, + BY_MINUTE = 1, + BY_HOUR = 2, + BY_DAY = 3, + BY_MONTH_DAY = 4, + BY_YEAR_DAY = 5, + BY_WEEK_NO = 6, + BY_MONTH = 7, + BY_SET_POS +}; + + + +struct icalrecur_iterator_impl { + + struct icaltimetype dtstart; /* Hack. Make into time_t */ + struct icaltimetype last; /* last time return from _iterator_next*/ + int occurrence_no; /* number of step made on t iterator */ + struct icalrecurrencetype rule; + + short days[366]; + short days_index; + + enum byrule byrule; + short by_indices[9]; + short orig_data[9]; /**< 1 if there was data in the byrule */ + + + short *by_ptrs[9]; /**< Pointers into the by_* array elements of the rule */ + +}; + +static void increment_year(icalrecur_iterator* impl, int inc); + +int icalrecur_iterator_sizeof_byarray(short* byarray) +{ + int array_itr; + + for(array_itr = 0; + byarray[array_itr] != ICAL_RECURRENCE_ARRAY_MAX; + array_itr++){ + } + + return array_itr; +} + +enum expand_table { + UNKNOWN = 0, + CONTRACT = 1, + EXPAND =2, + ILLEGAL=3 +}; + +/** + * The split map indicates, for a particular interval, wether a BY_* + * rule part expands the number of instances in the occcurrence set or + * contracts it. 1=> contract, 2=>expand, and 3 means the pairing is + * not allowed. + */ + +struct expand_split_map_struct +{ + icalrecurrencetype_frequency frequency; + + /* Elements of the 'map' array correspond to the BYxxx rules: + Second,Minute,Hour,Day,Month Day,Year Day,Week No,Month*/ + + short map[8]; +}; + +static struct expand_split_map_struct expand_map[] = +{ + {ICAL_SECONDLY_RECURRENCE,{1,1,1,1,1,1,1,1}}, + {ICAL_MINUTELY_RECURRENCE,{2,1,1,1,1,1,1,1}}, + {ICAL_HOURLY_RECURRENCE, {2,2,1,1,1,1,1,1}}, + {ICAL_DAILY_RECURRENCE, {2,2,2,1,1,1,1,1}}, + {ICAL_WEEKLY_RECURRENCE, {2,2,2,2,3,3,1,1}}, + {ICAL_MONTHLY_RECURRENCE, {2,2,2,2,2,3,3,1}}, + {ICAL_YEARLY_RECURRENCE, {2,2,2,2,2,2,2,2}}, + {ICAL_NO_RECURRENCE, {0,0,0,0,0,0,0,0}} + +}; + + + +/** Check that the rule has only the two given interday byrule parts. */ +static +int icalrecur_two_byrule(icalrecur_iterator* impl, + enum byrule one,enum byrule two) +{ + short test_array[9]; + enum byrule itr; + int passes = 0; + + memset(test_array,0,sizeof(test_array)); + + test_array[one] = 1; + test_array[two] = 1; + + for(itr = BY_DAY; itr != BY_SET_POS; itr++){ + + if( (test_array[itr] == 0 && + impl->by_ptrs[itr][0] != ICAL_RECURRENCE_ARRAY_MAX + ) || + (test_array[itr] == 1 && + impl->by_ptrs[itr][0] == ICAL_RECURRENCE_ARRAY_MAX + ) + ) { + /* test failed */ + passes = 0; + } + } + + return passes; + +} + +/** Check that the rule has only the one given interdat byrule parts. */ +static int icalrecur_one_byrule(icalrecur_iterator* impl,enum byrule one) +{ + int passes = 1; + enum byrule itr; + + for(itr = BY_DAY; itr != BY_SET_POS; itr++){ + + if ((itr==one && impl->by_ptrs[itr][0] == ICAL_RECURRENCE_ARRAY_MAX) || + (itr!=one && impl->by_ptrs[itr][0] != ICAL_RECURRENCE_ARRAY_MAX)) { + passes = 0; + } + } + + return passes; +} + +/*static int count_byrules(icalrecur_iterator* impl) +{ + int count = 0; + enum byrule itr; + + for(itr = BY_DAY; itr <= BY_SET_POS; itr++){ + if(impl->by_ptrs[itr][0] != ICAL_RECURRENCE_ARRAY_MAX){ + count++; + } + } + + return count; +}*/ + + +static void setup_defaults(icalrecur_iterator* impl, + enum byrule byrule, icalrecurrencetype_frequency req, + int deftime, int *timepart) +{ + + icalrecurrencetype_frequency freq; + freq = impl->rule.freq; + + /* Re-write the BY rule arrays with data from the DTSTART time so + we don't have to explicitly deal with DTSTART */ + + if(impl->by_ptrs[byrule][0] == ICAL_RECURRENCE_ARRAY_MAX && + expand_map[freq].map[byrule] != CONTRACT){ + impl->by_ptrs[byrule][0] = (short)deftime; + } + + /* Initialize the first occurrence */ + if( freq != req && expand_map[freq].map[byrule] != CONTRACT){ + *timepart = impl->by_ptrs[byrule][0]; + } + + +} + +static int has_by_data(icalrecur_iterator* impl, enum byrule byrule){ + + return (impl->orig_data[byrule] == 1); +} + + +static int expand_year_days(icalrecur_iterator* impl, int year); + + +icalrecur_iterator* icalrecur_iterator_new(struct icalrecurrencetype rule, + struct icaltimetype dtstart) +{ + icalrecur_iterator* impl; + icalrecurrencetype_frequency freq; + + if ( ( impl = (icalrecur_iterator*) + malloc(sizeof(icalrecur_iterator))) == 0) { + icalerror_set_errno(ICAL_NEWFAILED_ERROR); + return 0; + } + + memset(impl,0,sizeof(icalrecur_iterator)); + + impl->rule = rule; + impl->last = dtstart; + impl->dtstart = dtstart; + impl->days_index =0; + impl->occurrence_no = 0; + freq = impl->rule.freq; + + /* Set up convienience pointers to make the code simpler. Allows + us to iterate through all of the BY* arrays in the rule. */ + + impl->by_ptrs[BY_MONTH]=impl->rule.by_month; + impl->by_ptrs[BY_WEEK_NO]=impl->rule.by_week_no; + impl->by_ptrs[BY_YEAR_DAY]=impl->rule.by_year_day; + impl->by_ptrs[BY_MONTH_DAY]=impl->rule.by_month_day; + impl->by_ptrs[BY_DAY]=impl->rule.by_day; + impl->by_ptrs[BY_HOUR]=impl->rule.by_hour; + impl->by_ptrs[BY_MINUTE]=impl->rule.by_minute; + impl->by_ptrs[BY_SECOND]=impl->rule.by_second; + impl->by_ptrs[BY_SET_POS]=impl->rule.by_set_pos; + + memset(impl->orig_data,0,9*sizeof(short)); + + /* Note which by rules had data in them when the iterator was + created. We can't use the actuall by_x arrays, because the + empty ones will be given default values later in this + routine. The orig_data array will be used later in has_by_data */ + + impl->orig_data[BY_MONTH] + = (short)(impl->rule.by_month[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_WEEK_NO] + =(short)(impl->rule.by_week_no[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_YEAR_DAY] + =(short)(impl->rule.by_year_day[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_MONTH_DAY] + =(short)(impl->rule.by_month_day[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_DAY] + = (short)(impl->rule.by_day[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_HOUR] + = (short)(impl->rule.by_hour[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_MINUTE] + = (short)(impl->rule.by_minute[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_SECOND] + = (short)(impl->rule.by_second[0]!=ICAL_RECURRENCE_ARRAY_MAX); + impl->orig_data[BY_SET_POS] + = (short)(impl->rule.by_set_pos[0]!=ICAL_RECURRENCE_ARRAY_MAX); + + + /* Check if the recurrence rule is legal */ + + /* If the BYYEARDAY appears, no other date rule part may appear. */ + + if(icalrecur_two_byrule(impl,BY_YEAR_DAY,BY_MONTH) || + icalrecur_two_byrule(impl,BY_YEAR_DAY,BY_WEEK_NO) || + icalrecur_two_byrule(impl,BY_YEAR_DAY,BY_MONTH_DAY) || + icalrecur_two_byrule(impl,BY_YEAR_DAY,BY_DAY) ){ + + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + + return 0; + } + + /* BYWEEKNO and BYMONTH rule parts may not both appear.*/ + + if(icalrecur_two_byrule(impl,BY_WEEK_NO,BY_MONTH)){ + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + return 0; + } + + /* BYWEEKNO and BYMONTHDAY rule parts may not both appear.*/ + + if(icalrecur_two_byrule(impl,BY_WEEK_NO,BY_MONTH_DAY)){ + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + return 0; + } + + + /*For MONTHLY recurrences (FREQ=MONTHLY) neither BYYEARDAY nor + BYWEEKNO may appear. */ + + if(freq == ICAL_MONTHLY_RECURRENCE && + icalrecur_one_byrule(impl,BY_WEEK_NO)){ + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + return 0; + } + + + /*For WEEKLY recurrences (FREQ=WEEKLY) neither BYMONTHDAY nor + BYYEARDAY may appear. */ + + if(freq == ICAL_WEEKLY_RECURRENCE && + icalrecur_one_byrule(impl,BY_MONTH_DAY )) { + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + return 0; + } + + /* BYYEARDAY may only appear in YEARLY rules */ + if(freq != ICAL_YEARLY_RECURRENCE && + icalrecur_one_byrule(impl,BY_YEAR_DAY )) { + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + return 0; + } + + /* Rewrite some of the rules and set up defaults to make later + processing easier. Primarily, t involves copying an element + from the start time into the corresponding BY_* array when the + BY_* array is empty */ + + + setup_defaults(impl,BY_SECOND,ICAL_SECONDLY_RECURRENCE, + impl->dtstart.second, + &(impl->last.second)); + + setup_defaults(impl,BY_MINUTE,ICAL_MINUTELY_RECURRENCE, + impl->dtstart.minute, + &(impl->last.minute)); + + setup_defaults(impl,BY_HOUR,ICAL_HOURLY_RECURRENCE, + impl->dtstart.hour, + &(impl->last.hour)); + + setup_defaults(impl,BY_MONTH_DAY,ICAL_DAILY_RECURRENCE, + impl->dtstart.day, + &(impl->last.day)); + + setup_defaults(impl,BY_MONTH,ICAL_MONTHLY_RECURRENCE, + impl->dtstart.month, + &(impl->last.month)); + + + if(impl->rule.freq == ICAL_WEEKLY_RECURRENCE ){ + + if(impl->by_ptrs[BY_DAY][0] == ICAL_RECURRENCE_ARRAY_MAX){ + + /* Weekly recurrences with no BY_DAY data should occur on the + same day of the week as the start time . */ + impl->by_ptrs[BY_DAY][0] = (short)icaltime_day_of_week(impl->dtstart); + + } else { + /* If there is BY_DAY data, then we need to move the initial + time to the start of the BY_DAY data. That is if the + start time is on a Wednesday, and the rule has + BYDAY=MO,WE,FR, move the initial time back to + monday. Otherwise, jumping to the next week ( jumping 7 + days ahead ) will skip over some occurrences in the + second week. */ + + /* This is probably a HACK. There should be some more + general way to solve this problem */ + + short dow = (short)(impl->by_ptrs[BY_DAY][0]-icaltime_day_of_week(impl->last)); + + if(dow < 0) { + /* initial time is after first day of BY_DAY data */ + + impl->last.day += dow; + impl->last = icaltime_normalize(impl->last); + } + } + + + } + + /* For YEARLY rule, begin by setting up the year days array . The + YEARLY rules work by expanding one year at a time. */ + + if(impl->rule.freq == ICAL_YEARLY_RECURRENCE){ + struct icaltimetype next; + + for (;;) { + expand_year_days(impl, impl->last.year); + if (impl->days[0] != ICAL_RECURRENCE_ARRAY_MAX) + break; /* break when no days are expanded */ + increment_year(impl,impl->rule.interval); + } + + /* Copy the first day into last. */ + next = icaltime_from_day_of_year(impl->days[0], impl->last.year); + + impl->last.day = next.day; + impl->last.month = next.month; + } + + + /* If this is a monthly interval with by day data, then we need to + set the last value to the appropriate day of the month */ + + if(impl->rule.freq == ICAL_MONTHLY_RECURRENCE && + has_by_data(impl,BY_DAY)) { + + int dow = icalrecurrencetype_day_day_of_week( + impl->by_ptrs[BY_DAY][impl->by_indices[BY_DAY]]); + int pos = icalrecurrencetype_day_position( + impl->by_ptrs[BY_DAY][impl->by_indices[BY_DAY]]); + + int poscount = 0; + int days_in_month = + icaltime_days_in_month(impl->last.month, impl->last.year); + + if(pos >= 0){ + /* Count up from the first day pf the month to find the + pos'th weekday of dow ( like the second monday. ) */ + + for(impl->last.day = 1; + impl->last.day <= days_in_month; + impl->last.day++){ + + if(icaltime_day_of_week(impl->last) == dow){ + if(++poscount == pos || pos == 0){ + break; + } + } + } + } else { + /* Count down from the last day pf the month to find the + pos'th weekday of dow ( like the second to last monday. ) */ + pos = -pos; + for(impl->last.day = days_in_month; + impl->last.day != 0; + impl->last.day--){ + + if(icaltime_day_of_week(impl->last) == dow){ + if(++poscount == pos ){ + break; + } + } + } + } + + + if(impl->last.day > days_in_month || impl->last.day == 0){ + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + return 0; + } + + } + + + + return impl; +} + + +void icalrecur_iterator_free(icalrecur_iterator* i) +{ + icalerror_check_arg_rv((i!=0),"impl"); + + free(i); + +} + +static void increment_year(icalrecur_iterator* impl, int inc) +{ + impl->last.year+=inc; +} + +/** Increment month is different that the other incement_* routines -- + it figures out the interval for itself, and uses BYMONTH data if + available. */ +static void increment_month(icalrecur_iterator* impl) +{ + int years; + + if(has_by_data(impl,BY_MONTH) ){ + /* Ignore the frequency and use the byrule data */ + + impl->by_indices[BY_MONTH]++; + + if (impl->by_ptrs[BY_MONTH][impl->by_indices[BY_MONTH]] + ==ICAL_RECURRENCE_ARRAY_MAX){ + impl->by_indices[BY_MONTH] = 0; + + increment_year(impl,1); + + } + + impl->last.month = + impl->by_ptrs[BY_MONTH][impl->by_indices[BY_MONTH]]; + + } else { + + int inc; + + if(impl->rule.freq == ICAL_MONTHLY_RECURRENCE){ + inc = impl->rule.interval; + } else { + inc = 1; + } + + impl->last.month+=inc; + + /* Months are offset by one */ + impl->last.month--; + + years = impl->last.month / 12; + + impl->last.month = impl->last.month % 12; + + impl->last.month++; + + if (years != 0){ + increment_year(impl,years); + } + } +} + +static void increment_monthday(icalrecur_iterator* impl, int inc) +{ + int i; + + for(i=0; i<inc; i++){ + + int days_in_month = + icaltime_days_in_month(impl->last.month, impl->last.year); + + impl->last.day++; + + if (impl->last.day > days_in_month){ + impl->last.day = impl->last.day-days_in_month; + increment_month(impl); + } + } +} + + +static void increment_hour(icalrecur_iterator* impl, int inc) +{ + int days; + + impl->last.hour+=inc; + + days = impl->last.hour / 24; + impl->last.hour = impl->last.hour % 24; + + if (impl->days != 0){ + increment_monthday(impl,days); + } +} + +static void increment_minute(icalrecur_iterator* impl, int inc) +{ + int hours; + + impl->last.minute+=inc; + + hours = impl->last.minute / 60; + impl->last.minute = impl->last.minute % 60; + + if (hours != 0){ + increment_hour(impl,hours); + } + +} + +static void increment_second(icalrecur_iterator* impl, int inc) +{ + int minutes; + + impl->last.second+=inc; + + minutes = impl->last.second / 60; + impl->last.second = impl->last.second % 60; + + if (minutes != 0) + { + increment_minute(impl, minutes); + } +} + +#if 0 +#include "ical.h" +void test_increment() +{ + icalrecur_iterator impl; + + impl.last = icaltime_from_string("20000101T000000Z"); + + printf("Orig: %s\n",icaltime_as_ctime(impl.last)); + + increment_second(&impl,5); + printf("+ 5 sec : %s\n",icaltime_as_ctime(impl.last)); + + increment_second(&impl,355); + printf("+ 355 sec : %s\n",icaltime_as_ctime(impl.last)); + + increment_minute(&impl,5); + printf("+ 5 min : %s\n",icaltime_as_ctime(impl.last)); + + increment_minute(&impl,360); + printf("+ 360 min : %s\n",icaltime_as_ctime(impl.last)); + increment_hour(&impl,5); + printf("+ 5 hours : %s\n",icaltime_as_ctime(impl.last)); + increment_hour(&impl,43); + printf("+ 43 hours : %s\n",icaltime_as_ctime(impl.last)); + increment_monthday(&impl,3); + printf("+ 3 days : %s\n",icaltime_as_ctime(impl.last)); + increment_monthday(&impl,600); + printf("+ 600 days : %s\n",icaltime_as_ctime(impl.last)); + +} + +#endif + +static int next_second(icalrecur_iterator* impl) +{ + + int has_by_second = (impl->by_ptrs[BY_SECOND][0]!=ICAL_RECURRENCE_ARRAY_MAX); + int this_frequency = (impl->rule.freq == ICAL_SECONDLY_RECURRENCE); + + int end_of_data = 0; + + assert(has_by_second || this_frequency); + + if( has_by_second ){ + /* Ignore the frequency and use the byrule data */ + + impl->by_indices[BY_SECOND]++; + + if (impl->by_ptrs[BY_SECOND][impl->by_indices[BY_SECOND]] + ==ICAL_RECURRENCE_ARRAY_MAX){ + impl->by_indices[BY_SECOND] = 0; + + end_of_data = 1; + } + + + impl->last.second = + impl->by_ptrs[BY_SECOND][impl->by_indices[BY_SECOND]]; + + + } else if( !has_by_second && this_frequency ){ + /* Compute the next value from the last time and the frequency interval*/ + increment_second(impl, impl->rule.interval); + + } + + /* If we have gone through all of the seconds on the BY list, then we + need to move to the next minute */ + + if(has_by_second && end_of_data && this_frequency ){ + increment_minute(impl,1); + } + + return end_of_data; + +} + +static int next_minute(icalrecur_iterator* impl) +{ + + int has_by_minute = (impl->by_ptrs[BY_MINUTE][0]!=ICAL_RECURRENCE_ARRAY_MAX); + int this_frequency = (impl->rule.freq == ICAL_MINUTELY_RECURRENCE); + + int end_of_data = 0; + + assert(has_by_minute || this_frequency); + + + if (next_second(impl) == 0){ + return 0; + } + + if( has_by_minute ){ + /* Ignore the frequency and use the byrule data */ + + impl->by_indices[BY_MINUTE]++; + + if (impl->by_ptrs[BY_MINUTE][impl->by_indices[BY_MINUTE]] + ==ICAL_RECURRENCE_ARRAY_MAX){ + + impl->by_indices[BY_MINUTE] = 0; + + end_of_data = 1; + } + + impl->last.minute = + impl->by_ptrs[BY_MINUTE][impl->by_indices[BY_MINUTE]]; + + } else if( !has_by_minute && this_frequency ){ + /* Compute the next value from the last time and the frequency interval*/ + increment_minute(impl,impl->rule.interval); + } + +/* If we have gone through all of the minutes on the BY list, then we + need to move to the next hour */ + + if(has_by_minute && end_of_data && this_frequency ){ + increment_hour(impl,1); + } + + return end_of_data; +} + +static int next_hour(icalrecur_iterator* impl) +{ + + int has_by_hour = (impl->by_ptrs[BY_HOUR][0]!=ICAL_RECURRENCE_ARRAY_MAX); + int this_frequency = (impl->rule.freq == ICAL_HOURLY_RECURRENCE); + + int end_of_data = 0; + + assert(has_by_hour || this_frequency); + + if (next_minute(impl) == 0){ + return 0; + } + + if( has_by_hour ){ + /* Ignore the frequency and use the byrule data */ + + impl->by_indices[BY_HOUR]++; + + if (impl->by_ptrs[BY_HOUR][impl->by_indices[BY_HOUR]] + ==ICAL_RECURRENCE_ARRAY_MAX){ + impl->by_indices[BY_HOUR] = 0; + + end_of_data = 1; + } + + impl->last.hour = + impl->by_ptrs[BY_HOUR][impl->by_indices[BY_HOUR]]; + + } else if( !has_by_hour && this_frequency ){ + /* Compute the next value from the last time and the frequency interval*/ + increment_hour(impl,impl->rule.interval); + + } + + /* If we have gone through all of the hours on the BY list, then we + need to move to the next day */ + + if(has_by_hour && end_of_data && this_frequency ){ + increment_monthday(impl,1); + } + + return end_of_data; + +} + +static int next_day(icalrecur_iterator* impl) +{ + + int has_by_day = (impl->by_ptrs[BY_DAY][0]!=ICAL_RECURRENCE_ARRAY_MAX); + int this_frequency = (impl->rule.freq == ICAL_DAILY_RECURRENCE); + + assert(has_by_day || this_frequency); + + if (next_hour(impl) == 0){ + return 0; + } + + /* Always increment through the interval, since this routine is not + called by any other next_* routine, and the days that are + excluded will be taken care of by restriction filtering */ + + if(this_frequency){ + increment_monthday(impl,impl->rule.interval); + } else { + increment_monthday(impl,1); + } + + + return 0; + +} + + +/*static int next_yearday(icalrecur_iterator* impl) +{ + + int has_by_yearday = (impl->by_ptrs[BY_YEAR_DAY][0]!=ICAL_RECURRENCE_ARRAY_MAX); + + int end_of_data = 0; + + assert(has_by_yearday ); + + if (next_hour(impl) == 0){ + return 0; + } + + impl->by_indices[BY_YEAR_DAY]++; + + if (impl->by_ptrs[BY_YEAR_DAY][impl->by_indices[BY_YEAR_DAY]] + ==ICAL_RECURRENCE_ARRAY_MAX){ + impl->by_indices[BY_YEAR_DAY] = 0; + + end_of_data = 1; + } + + impl->last.day = + impl->by_ptrs[BY_YEAR_DAY][impl->by_indices[BY_YEAR_DAY]]; + + if(has_by_yearday && end_of_data){ + increment_year(impl,1); + } + + return end_of_data; + +}*/ + + +/* Returns the day of the month for the current month of t that is the + pos'th instance of the day-of-week dow */ + +static int nth_weekday(int dow, int pos, struct icaltimetype t){ + + int days_in_month = icaltime_days_in_month(t.month, t.year); + int end_dow, start_dow; + int wd; + + if(pos >= 0){ + t.day = 1; + start_dow = icaltime_day_of_week(t); + + if (pos != 0) { + pos--; + } + + /* find month day of first occurrence of dow -- such as the + month day of the first monday */ + + wd = dow-start_dow+1; + + if (wd <= 0){ + wd = wd + 7; + } + + wd = wd + pos * 7; + + } else { + t.day = days_in_month; + end_dow = icaltime_day_of_week(t); + + pos++; + + /* find month day of last occurrence of dow -- such as the + month day of the last monday */ + + wd = (end_dow - dow); + + if (wd < 0){ + wd = wd+ 7; + } + + wd = days_in_month - wd; + + wd = wd + pos * 7; + } + + return wd; +} + +static int is_day_in_byday(icalrecur_iterator* impl,struct icaltimetype tt){ + + int idx; + + for(idx = 0; BYDAYPTR[idx] != ICAL_RECURRENCE_ARRAY_MAX; idx++){ + int dow = icalrecurrencetype_day_day_of_week(BYDAYPTR[idx]); + int pos = icalrecurrencetype_day_position(BYDAYPTR[idx]); + int this_dow = icaltime_day_of_week(tt); + + if( (pos == 0 && dow == this_dow ) || /* Just a dow, like "TU" or "FR" */ + (nth_weekday(dow,pos,tt) == tt.day)){ /*pos+wod: "3FR" or -1TU" */ + return 1; + } + } + + return 0; +} + +static int next_month(icalrecur_iterator* impl) +{ + int data_valid = 1; + + int this_frequency = (impl->rule.freq == ICAL_MONTHLY_RECURRENCE); + + assert( has_by_data(impl,BY_MONTH) || this_frequency); + + /* Iterate through the occurrences within a day. If we don't get to + the end of the intra-day data, don't bother going to the next + month */ + + if (next_hour(impl) == 0){ + return data_valid; /* Signal that the data is valid */ + } + + /* Now iterate through the occurrences within a month -- by days, + weeks or weekdays. */ + + /* + * Case 1: + * Rules Like: FREQ=MONTHLY;INTERVAL=1;BYDAY=FR;BYMONTHDAY=13 + */ + + if(has_by_data(impl,BY_DAY) && has_by_data(impl,BY_MONTH_DAY)){ + int day, idx,j; + int days_in_month = icaltime_days_in_month(impl->last.month, + impl->last.year); + /* Iterate through the remaining days in the month and check if + each day is listed in the BY_DAY array and in the BY_MONTHDAY + array. This seems very inneficient, but I think it is the + simplest way to account for both BYDAY=1FR (First friday in + month) and BYDAY=FR ( every friday in month ) */ + + for(day = impl->last.day+1; day <= days_in_month; day++){ + for(idx = 0; BYDAYPTR[idx] != ICAL_RECURRENCE_ARRAY_MAX; idx++){ + for(j = 0; BYMDPTR[j]!=ICAL_RECURRENCE_ARRAY_MAX; j++){ + int dow = + icalrecurrencetype_day_day_of_week(BYDAYPTR[idx]); + int pos = icalrecurrencetype_day_position(BYDAYPTR[idx]); + int mday = BYMDPTR[j]; + int this_dow; + + impl->last.day = day; + this_dow = icaltime_day_of_week(impl->last); + + if( (pos == 0 && dow == this_dow && mday == day) || + (nth_weekday(dow,pos,impl->last) == day && mday==day)){ + goto MDEND; + } + } + } + } + + MDEND: + + if ( day > days_in_month){ + impl->last.day = 1; + increment_month(impl); + data_valid = 0; /* signal that impl->last is invalid */ + } + + + /* + * Case 2: + * Rules Like: FREQ=MONTHLY;INTERVAL=1;BYDAY=FR + */ + + } else if(has_by_data(impl,BY_DAY)){ + /* For this case, the weekdays are relative to the + month. BYDAY=FR -> First Friday in month, etc. */ + + /* This code iterates through the remaining days in the month + and checks if each day is listed in the BY_DAY array. This + seems very inneficient, but I think it is the simplest way to + account for both BYDAY=1FR (First friday in month) and + BYDAY=FR ( every friday in month ) */ + + int day; + int days_in_month = icaltime_days_in_month(impl->last.month, + impl->last.year); + assert( BYDAYPTR[0]!=ICAL_RECURRENCE_ARRAY_MAX); + + for(day = impl->last.day+1; day <= days_in_month; day++){ + impl->last.day = day; + if(is_day_in_byday(impl,impl->last)){ + data_valid = 1; + break; + } + } + + if ( day > days_in_month){ + impl->last.day = 1; + increment_month(impl); + + /* Did moving to the next month put us on a valid date? if + so, note that the new data is valid, if, not, mark it + invalid */ + + if(is_day_in_byday(impl,impl->last)){ + data_valid = 1; + } else { + data_valid = 0; /* signal that impl->last is invalid */ + } + } + + /* + * Case 3 + * Rules Like: FREQ=MONTHLY;COUNT=10;BYMONTHDAY=-3 + */ + + } else if (has_by_data(impl,BY_MONTH_DAY)) { + int day; + + assert( BYMDPTR[0]!=ICAL_RECURRENCE_ARRAY_MAX); + + BYMDIDX++; + + /* Are we at the end of the BYDAY array? */ + if (BYMDPTR[BYMDIDX] ==ICAL_RECURRENCE_ARRAY_MAX){ + + BYMDIDX = 0; /* Reset to 0 */ + increment_month(impl); + } + + day = BYMDPTR[BYMDIDX]; + + if (day < 0) { + day = icaltime_days_in_month(impl->last.month, impl->last.year) + day + 1; + } + + impl->last.day = day; + + } else { + increment_month(impl); + } + + return data_valid; + +} + +static int next_weekday_by_week(icalrecur_iterator* impl) +{ + + int end_of_data = 0; + int start_of_week, dow; + struct icaltimetype next; + + if (next_hour(impl) == 0){ + return 0; + } + + if(!has_by_data(impl,BY_DAY)){ + return 1; + } + + /* If we get here, we need to step to tne next day */ + + for (;;) { + struct icaltimetype tt = icaltime_null_time(); + BYDAYIDX++; /* Look at next elem in BYDAY array */ + + /* Are we at the end of the BYDAY array? */ + if (BYDAYPTR[BYDAYIDX]==ICAL_RECURRENCE_ARRAY_MAX){ + BYDAYIDX = 0; /* Reset to 0 */ + end_of_data = 1; /* Signal that we're at the end */ + } + + /* Add the day of week offset to to the start of this week, and use + that to get the next day */ + /* ignore position of dow ("4FR"), only use dow ("FR")*/ + dow = icalrecurrencetype_day_day_of_week(BYDAYPTR[BYDAYIDX]); + tt.year = impl->last.year; + tt.day = impl->last.day; + tt.month = impl->last.month; + + start_of_week = icaltime_start_doy_of_week(tt); + + dow--; /* Set Sunday to be 0 */ + + if(dow+start_of_week <1){ + /* The selected date is in the previous year. */ + if(!end_of_data){ + continue; + } + } + + next = icaltime_from_day_of_year(start_of_week + dow,impl->last.year); + + impl->last.day = next.day; + impl->last.month = next.month; + impl->last.year = next.year; + + return end_of_data; + } + +} + +static int next_week(icalrecur_iterator* impl) +{ + int end_of_data = 0; + + /* Increment to the next week day, if there is data at a level less than a week */ + if (next_weekday_by_week(impl) == 0){ + return 0; /* Have not reached end of week yet */ + } + + /* If we get here, we have incremented through the entire week, and + can increment to the next week */ + + if( has_by_data(impl,BY_WEEK_NO)){ + /*FREQ=WEEKLY;BYWEEK=20*/ + /* Use the Week Number byrule data */ + int week_no; + struct icaltimetype t; + + impl->by_indices[BY_WEEK_NO]++; + + if (impl->by_ptrs[BY_WEEK_NO][impl->by_indices[BY_WEEK_NO]] + ==ICAL_RECURRENCE_ARRAY_MAX){ + impl->by_indices[BY_WEEK_NO] = 0; + + end_of_data = 1; + } + + t = impl->last; + t.month=1; /* HACK, should be setting to the date of the first week of year*/ + t.day=1; + + week_no = impl->by_ptrs[BY_WEEK_NO][impl->by_indices[BY_WEEK_NO]]; + + impl->last.day += week_no*7; + + impl->last = icaltime_normalize(impl->last); + + } else { + /* Jump to the next week */ + increment_monthday(impl,7*impl->rule.interval); + } + + if( has_by_data(impl,BY_WEEK_NO) && end_of_data){ + increment_year(impl,1); + } + + return end_of_data; + +} + +/** Expand the BYDAY rule part and return a pointer to a newly allocated list of days. */ +static pvl_list expand_by_day(icalrecur_iterator* impl, int year) +{ + /* Try to calculate each of the occurrences. */ + int i; + pvl_list days_list = pvl_newlist(); + + int start_dow, end_dow, end_year_day; + struct icaltimetype tmp = impl->last; + + tmp.year= year; + tmp.month = 1; + tmp.day = 1; + tmp.is_date = 1; + + /* Find the day that 1st Jan falls on, 1 (Sun) to 7 (Sat). */ + start_dow = icaltime_day_of_week(tmp); + + /* Get the last day of the year*/ + tmp.year= year; + tmp.month = 12; + tmp.day = 31; + tmp.is_date = 1; + + end_dow = icaltime_day_of_week(tmp); + end_year_day = icaltime_day_of_year(tmp); + + for(i = 0; BYDAYPTR[i] != ICAL_RECURRENCE_ARRAY_MAX; i++){ + /* This is 1 (Sun) to 7 (Sat). */ + int dow = + icalrecurrencetype_day_day_of_week(BYDAYPTR[i]); + int pos = icalrecurrencetype_day_position(BYDAYPTR[i]); + + if(pos == 0){ + /* The day was specified without a position -- it is just + a bare day of the week ( BYDAY=SU) so add all of the + days of the year with this day-of-week*/ + int doy, tmp_start_doy; + + tmp_start_doy = ((dow + 7 - start_dow) % 7) + 1; + + for (doy = tmp_start_doy; doy <= end_year_day; doy += 7) + pvl_push(days_list,(void*)(ptrdiff_t)doy); + + } else if ( pos > 0) { + int first; + /* First occurrence of dow in year */ + if( dow >= start_dow) { + first = dow - start_dow + 1; + } else { + first = dow - start_dow + 8; + } + + /* Then just multiple the position times 7 to get the pos'th day in the year */ + pvl_push(days_list,(void*)(first+ (pos-1) * 7)); + + } else { /* pos < 0 */ + int last; + pos = -pos; + + /* last occurrence of dow in year */ + if( dow <= end_dow) { + last = end_year_day - end_dow + dow; + } else { + last = end_year_day - end_dow + dow - 7; + } + + pvl_push(days_list,(void*)(last - (pos-1) * 7)); + } + } + return days_list; +} + + +/* For INTERVAL=YEARLY, set up the days[] array in the iterator to + list all of the days of the current year that are specified in this + rule. */ + +static int expand_year_days(icalrecur_iterator* impl, int year) +{ + int j,k; + int days_index=0; + struct icaltimetype t; + int flags; + + t = icaltime_null_date(); + +#define HBD(x) has_by_data(impl,x) + + memset(impl->days,ICAL_RECURRENCE_ARRAY_MAX_BYTE,sizeof(impl->days)); + + /* The flags and the following switch statement select which code + to use to expand the yers days, based on which BY-rules are + present. */ + + flags = (HBD(BY_DAY) ? 1<<BY_DAY : 0) + + (HBD(BY_WEEK_NO) ? 1<<BY_WEEK_NO : 0) + + (HBD(BY_MONTH_DAY) ? 1<<BY_MONTH_DAY : 0) + + (HBD(BY_MONTH) ? 1<<BY_MONTH : 0) + + (HBD(BY_YEAR_DAY) ? 1<<BY_YEAR_DAY : 0); + + + switch(flags) { + + case 0: { + /* FREQ=YEARLY; */ + t = impl->dtstart; + t.year = impl->last.year; + + impl->days[days_index++] = (short)icaltime_day_of_year(t); + + break; + } + case 1<<BY_MONTH: { + /* FREQ=YEARLY; BYMONTH=3,11*/ + + for(j=0;impl->by_ptrs[BY_MONTH][j]!=ICAL_RECURRENCE_ARRAY_MAX;j++){ + int month = impl->by_ptrs[BY_MONTH][j]; + int doy; + + t = impl->dtstart; + t.year = year; + t.month = month; + t.is_date = 1; + + doy = icaltime_day_of_year(t); + + impl->days[days_index++] = (short)doy; + + } + break; + } + + case 1<<BY_MONTH_DAY: { + /* FREQ=YEARLY; BYMONTHDAY=1,15*/ + for(k=0;impl->by_ptrs[BY_MONTH_DAY][k]!=ICAL_RECURRENCE_ARRAY_MAX;k++) + { + int month_day = impl->by_ptrs[BY_MONTH_DAY][k]; + int doy; + + t = impl->dtstart; + t.day = month_day; + t.year = year; + t.is_date = 1; + + doy = icaltime_day_of_year(t); + + impl->days[days_index++] = (short)doy; + + } + break; + } + + case (1<<BY_MONTH_DAY) + (1<<BY_MONTH): { + /* FREQ=YEARLY; BYMONTHDAY=1,15; BYMONTH=10 */ + + for(j=0;impl->by_ptrs[BY_MONTH][j]!=ICAL_RECURRENCE_ARRAY_MAX;j++){ + for(k=0;impl->by_ptrs[BY_MONTH_DAY][k]!=ICAL_RECURRENCE_ARRAY_MAX;k++) + { + int month = impl->by_ptrs[BY_MONTH][j]; + int month_day = impl->by_ptrs[BY_MONTH_DAY][k]; + int doy; + + t.day = month_day; + t.month = month; + t.year = year; + t.is_date = 1; + + doy = icaltime_day_of_year(t); + + impl->days[days_index++] = (short)doy; + + } + } + + break; + } + + case 1<<BY_WEEK_NO: { + /* FREQ=YEARLY; BYWEEKNO=20,50 */ + + int dow; + + t.day = impl->dtstart.day; + t.month = impl->dtstart.month; + t.year = year; + t.is_date = 1; + + dow = icaltime_day_of_week(t); + /* HACK Not finished */ + + icalerror_set_errno(ICAL_UNIMPLEMENTED_ERROR); + + break; + } + + case (1<<BY_WEEK_NO) + (1<<BY_MONTH_DAY): { + /*FREQ=YEARLY; WEEKNO=20,50; BYMONTH= 6,11 */ + icalerror_set_errno(ICAL_UNIMPLEMENTED_ERROR); + break; + } + + case 1<<BY_DAY: { + /*FREQ=YEARLY; BYDAY=TH,20MO,-10FR*/ + pvl_elem i; + pvl_list days = expand_by_day(impl,year); + + + for(i=pvl_head(days);i!=0;i=pvl_next(i)){ + short day = (short)(intptr_t)pvl_data(i); + impl->days[days_index++] = day; + } + + pvl_free(days); + + break; + } + + case (1<<BY_DAY)+(1<<BY_MONTH): { + /*FREQ=YEARLY; BYDAY=TH,20MO,-10FR; BYMONTH = 12*/ + + + for(j=0;impl->by_ptrs[BY_MONTH][j]!=ICAL_RECURRENCE_ARRAY_MAX;j++){ + int month = impl->by_ptrs[BY_MONTH][j]; + int days_in_month = icaltime_days_in_month(month,year); + int first_dow, last_dow, doy_offset; + + t.year = year; + t.month = month; + t.day = 1; + t.is_date = 1; + + first_dow = icaltime_day_of_week(t); + + /* This holds the day offset used to calculate the day of the year + from the month day. Just add the month day to this. */ + doy_offset = icaltime_day_of_year(t) - 1; + + t.day = days_in_month; + last_dow = icaltime_day_of_week(t); + + for(k=0;impl->by_ptrs[BY_DAY][k]!=ICAL_RECURRENCE_ARRAY_MAX;k++){ + short day_coded = impl->by_ptrs[BY_DAY][k]; + enum icalrecurrencetype_weekday dow = + icalrecurrencetype_day_day_of_week(day_coded); + int pos = icalrecurrencetype_day_position(day_coded); + int first_matching_day, last_matching_day, day, month_day; + + /* Calculate the first day in the month with the given weekday, + and the last day. */ + first_matching_day = ((dow + 7 - first_dow) % 7) + 1; + last_matching_day = days_in_month - ((last_dow + 7 - dow) % 7); + + if (pos == 0) { + /* Add all of instances of the weekday within the month. */ + for (day = first_matching_day; day <= days_in_month; day += 7) + impl->days[days_index++] = (short)(doy_offset + day); + + } else if (pos > 0) { + /* Add the nth instance of the weekday within the month. */ + month_day = first_matching_day + (pos - 1) * 7; + + if (month_day <= days_in_month) + impl->days[days_index++] = (short)(doy_offset + month_day); + + } else { + /* Add the -nth instance of the weekday within the month.*/ + month_day = last_matching_day + (pos + 1) * 7; + + if (month_day > 0) + impl->days[days_index++] = (short)(doy_offset + month_day); + } + } + } + break; + } + + case (1<<BY_DAY) + (1<<BY_MONTH_DAY) : { + /*FREQ=YEARLY; BYDAY=TH,20MO,-10FR; BYMONTHDAY=1,15*/ + + pvl_elem itr; + pvl_list days = expand_by_day(impl,year); + + for(itr=pvl_head(days);itr!=0;itr=pvl_next(itr)){ + short day = (short)(intptr_t)pvl_data(itr); + struct icaltimetype tt; + + tt = icaltime_from_day_of_year(day,year); + + for(j = 0; BYMDPTR[j]!=ICAL_RECURRENCE_ARRAY_MAX; j++){ + int mday = BYMDPTR[j]; + + if(tt.day == mday){ + impl->days[days_index++] = day; + } + } + + } + + pvl_free(days); + + break; + } + + case (1<<BY_DAY) + (1<<BY_MONTH_DAY) + (1<<BY_MONTH): { + /*FREQ=YEARLY; BYDAY=TH,20MO,-10FR; BYMONTHDAY=10; MYMONTH=6,11*/ + + pvl_elem itr; + pvl_list days = expand_by_day(impl,year); + + for(itr=pvl_head(days);itr!=0;itr=pvl_next(itr)){ + short day = (short)(intptr_t)pvl_data(itr); + struct icaltimetype tt; + int i; + + tt = icaltime_from_day_of_year(day,year); + + for(i = 0; BYMONPTR[i] != ICAL_RECURRENCE_ARRAY_MAX; i++){ + for(j = 0; BYMDPTR[j]!=ICAL_RECURRENCE_ARRAY_MAX; j++){ + int mday = BYMDPTR[j]; + int month = BYMONPTR[i]; + + if(tt.month == month && tt.day == mday){ + impl->days[days_index++] = day; + } + } + } + + } + + pvl_free(days); + + break; + + } + + case (1<<BY_DAY) + (1<<BY_WEEK_NO) : { + /*FREQ=YEARLY; BYDAY=TH,20MO,-10FR; WEEKNO=20,50*/ + + pvl_elem itr; + pvl_list days = expand_by_day(impl,year); + + for(itr=pvl_head(days);itr!=0;itr=pvl_next(itr)){ + short day = (short)(intptr_t)pvl_data(itr); + struct icaltimetype tt; + int i; + + tt = icaltime_from_day_of_year(day,year); + + for(i = 0; BYWEEKPTR[i] != ICAL_RECURRENCE_ARRAY_MAX; i++){ + int weekno = BYWEEKPTR[i]; + int this_weekno = icaltime_week_number(tt); + if(weekno== this_weekno){ + impl->days[days_index++] = day; + } + } + + } + + pvl_free(days); + break; + } + + case (1<<BY_DAY) + (1<<BY_WEEK_NO) + (1<<BY_MONTH_DAY): { + /*FREQ=YEARLY; BYDAY=TH,20MO,-10FR; WEEKNO=20,50; BYMONTHDAY=1,15*/ + icalerror_set_errno(ICAL_UNIMPLEMENTED_ERROR); + break; + } + + case 1<<BY_YEAR_DAY: { + for(j=0;impl->by_ptrs[BY_YEAR_DAY][j]!=ICAL_RECURRENCE_ARRAY_MAX;j++){ + impl->days[days_index++] = impl->by_ptrs[BY_YEAR_DAY][j]; + } + break; + } + + default: { + icalerror_set_errno(ICAL_UNIMPLEMENTED_ERROR); + break; + } + + } + + return 0; +} + + +static int next_year(icalrecur_iterator* impl) +{ + struct icaltimetype next; + + if (next_hour(impl) == 0){ + return 0; + } + + if (impl->days[++impl->days_index] == ICAL_RECURRENCE_ARRAY_MAX){ + impl->days_index = 0; + + for (;;) { + increment_year(impl,impl->rule.interval); + expand_year_days(impl,impl->last.year); + if (impl->days[0] != ICAL_RECURRENCE_ARRAY_MAX) + break; + } + } + + next = icaltime_from_day_of_year(impl->days[impl->days_index], impl->last.year); + + impl->last.day = next.day; + impl->last.month = next.month; + + return 1; +} + +int icalrecur_check_rulepart(icalrecur_iterator* impl, + int v, enum byrule byrule) +{ + int itr; + + if(impl->by_ptrs[byrule][0]!=ICAL_RECURRENCE_ARRAY_MAX){ + for(itr=0; impl->by_ptrs[byrule][itr]!=ICAL_RECURRENCE_ARRAY_MAX;itr++){ + if(impl->by_ptrs[byrule][itr] == v){ + return 1; + } + } + } + + return 0; +} + +static int check_contract_restriction(icalrecur_iterator* impl, + enum byrule byrule, int v) +{ + int pass = 0; + int itr; + icalrecurrencetype_frequency freq = impl->rule.freq; + + if(impl->by_ptrs[byrule][0]!=ICAL_RECURRENCE_ARRAY_MAX && + expand_map[freq].map[byrule] == CONTRACT){ + for(itr=0; impl->by_ptrs[byrule][itr]!=ICAL_RECURRENCE_ARRAY_MAX;itr++){ + if(impl->by_ptrs[byrule][itr] == v){ + pass=1; + break; + } + } + + return pass; + } else { + /* This is not a contracting byrule, or it has no data, so the + test passes*/ + return 1; + } +} + + +static int check_contracting_rules(icalrecur_iterator* impl) +{ + + int day_of_week = icaltime_day_of_week(impl->last); + int week_no = icaltime_week_number(impl->last); + int year_day = icaltime_day_of_year(impl->last); + + if ( + check_contract_restriction(impl,BY_SECOND, impl->last.second) && + check_contract_restriction(impl,BY_MINUTE, impl->last.minute) && + check_contract_restriction(impl,BY_HOUR, impl->last.hour) && + check_contract_restriction(impl,BY_DAY, day_of_week) && + check_contract_restriction(impl,BY_WEEK_NO, week_no) && + check_contract_restriction(impl,BY_MONTH_DAY, impl->last.day) && + check_contract_restriction(impl,BY_MONTH, impl->last.month) && + check_contract_restriction(impl,BY_YEAR_DAY, year_day) ) + { + + return 1; + } else { + return 0; + } +} + +struct icaltimetype icalrecur_iterator_next(icalrecur_iterator *impl) +{ + int valid = 1; + + if( (impl->rule.count!=0 &&impl->occurrence_no >= impl->rule.count) || + (!icaltime_is_null_time(impl->rule.until) && + icaltime_compare(impl->last,impl->rule.until) > 0)) { + return icaltime_null_time(); + } + + if(impl->occurrence_no == 0 + && icaltime_compare(impl->last,impl->dtstart) >= 0){ + + impl->occurrence_no++; + return impl->last; + } + + do { + valid = 1; + switch(impl->rule.freq){ + + case ICAL_SECONDLY_RECURRENCE: { + next_second(impl); + break; + } + case ICAL_MINUTELY_RECURRENCE: { + next_minute(impl); + break; + } + case ICAL_HOURLY_RECURRENCE: { + next_hour(impl); + break; + } + case ICAL_DAILY_RECURRENCE: { + next_day(impl); + break; + } + case ICAL_WEEKLY_RECURRENCE: { + next_week(impl); + break; + } + case ICAL_MONTHLY_RECURRENCE: { + valid = next_month(impl); + break; + } + case ICAL_YEARLY_RECURRENCE:{ + next_year(impl); + break; + } + default:{ + icalerror_set_errno(ICAL_MALFORMEDDATA_ERROR); + return icaltime_null_time(); + } + } + + if(impl->last.year >= 2038 ){ + /* HACK */ + return icaltime_null_time(); + } + + } while(!check_contracting_rules(impl) + || icaltime_compare(impl->last,impl->dtstart) < 0 + || valid == 0); + + +/* Ignore null times and times that are after the until time */ + if( !icaltime_is_null_time(impl->rule.until) && + icaltime_compare(impl->last,impl->rule.until) > 0 ) { + return icaltime_null_time(); + } + + impl->occurrence_no++; + + return impl->last; +} + + +/************************** Type Routines **********************/ + + +void icalrecurrencetype_clear(struct icalrecurrencetype *recur) +{ + memset(recur,ICAL_RECURRENCE_ARRAY_MAX_BYTE, + sizeof(struct icalrecurrencetype)); + + recur->week_start = ICAL_MONDAY_WEEKDAY; + recur->freq = ICAL_NO_RECURRENCE; + recur->interval = 1; + memset(&(recur->until),0,sizeof(struct icaltimetype)); + recur->count = 0; +} + +/** The 'day' element of icalrecurrencetype_weekday is encoded to + * allow representation of both the day of the week ( Monday, Tueday), + * but also the Nth day of the week ( First tuesday of the month, last + * thursday of the year) These routines decode the day values. + * + * The day's position in the period ( Nth-ness) and the numerical + * value of the day are encoded together as: pos*7 + dow + * + * A position of 0 means 'any' or 'every' + */ + +enum icalrecurrencetype_weekday icalrecurrencetype_day_day_of_week(short day) +{ + return abs(day)%8; +} + +int icalrecurrencetype_day_position(short day) +{ + int wd, pos; + + wd = icalrecurrencetype_day_day_of_week(day); + + pos = (abs(day)-wd)/8 * ((day<0)?-1:1); + + + return pos; +} + + +/****************** Enumeration Routines ******************/ + +static struct {icalrecurrencetype_weekday wd; const char * str; } +wd_map[] = { + {ICAL_SUNDAY_WEEKDAY,"SU"}, + {ICAL_MONDAY_WEEKDAY,"MO"}, + {ICAL_TUESDAY_WEEKDAY,"TU"}, + {ICAL_WEDNESDAY_WEEKDAY,"WE"}, + {ICAL_THURSDAY_WEEKDAY,"TH"}, + {ICAL_FRIDAY_WEEKDAY,"FR"}, + {ICAL_SATURDAY_WEEKDAY,"SA"}, + {ICAL_NO_WEEKDAY,0} +}; + +const char* icalrecur_weekday_to_string(icalrecurrencetype_weekday kind) +{ + int i; + + for (i=0; wd_map[i].wd != ICAL_NO_WEEKDAY; i++) { + if ( wd_map[i].wd == kind) { + return wd_map[i].str; + } + } + + return 0; +} + +icalrecurrencetype_weekday icalrecur_string_to_weekday(const char* str) +{ + int i; + + for (i=0; wd_map[i].wd != ICAL_NO_WEEKDAY; i++) { + if ( strcasecmp(str,wd_map[i].str) == 0){ + return wd_map[i].wd; + } + } + + return ICAL_NO_WEEKDAY; +} + + + +static struct { + icalrecurrencetype_frequency kind; + const char* str; +} freq_map[] = { + {ICAL_SECONDLY_RECURRENCE,"SECONDLY"}, + {ICAL_MINUTELY_RECURRENCE,"MINUTELY"}, + {ICAL_HOURLY_RECURRENCE,"HOURLY"}, + {ICAL_DAILY_RECURRENCE,"DAILY"}, + {ICAL_WEEKLY_RECURRENCE,"WEEKLY"}, + {ICAL_MONTHLY_RECURRENCE,"MONTHLY"}, + {ICAL_YEARLY_RECURRENCE,"YEARLY"}, + {ICAL_NO_RECURRENCE,0} +}; + +const char* icalrecur_freq_to_string(icalrecurrencetype_frequency kind) +{ + int i; + + for (i=0; freq_map[i].kind != ICAL_NO_RECURRENCE ; i++) { + if ( freq_map[i].kind == kind ) { + return freq_map[i].str; + } + } + return 0; +} + +icalrecurrencetype_frequency icalrecur_string_to_freq(const char* str) +{ + int i; + + for (i=0; freq_map[i].kind != ICAL_NO_RECURRENCE ; i++) { + if ( strcasecmp(str,freq_map[i].str) == 0){ + return freq_map[i].kind; + } + } + return ICAL_NO_RECURRENCE; +} + +/** Fill an array with the 'count' number of occurrences generated by + * the rrule. Note that the times are returned in UTC, but the times + * are calculated in local time. YOu will have to convert the results + * back into local time before using them. + */ + +int icalrecur_expand_recurrence(char* rule, time_t start, + int count, time_t* array) +{ + struct icalrecurrencetype recur; + icalrecur_iterator* ritr; + time_t tt; + struct icaltimetype icstart, next; + int i = 0; + + memset(array, 0, count*sizeof(time_t)); + + icstart = icaltime_from_timet_with_zone(start,0,0); + + recur = icalrecurrencetype_from_string(rule); + + for(ritr = icalrecur_iterator_new(recur,icstart), + next = icalrecur_iterator_next(ritr); + !icaltime_is_null_time(next) && i < count; + next = icalrecur_iterator_next(ritr)){ + + tt = icaltime_as_timet(next); + + if (tt >= start ){ + array[i++] = tt; + } + + } + + icalrecur_iterator_free(ritr); + + return 1; +} |