96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* Copyright 2015, alex at staticlibs.net
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* File: ccronexpr.h
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* Author: alex
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*
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* Created on February 24, 2015, 9:35 AM
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*/
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#ifndef CCRONEXPR_H
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#define CCRONEXPR_H
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#if defined(__cplusplus) && !defined(CRON_COMPILE_AS_CXX)
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extern "C" {
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#endif
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#ifndef ANDROID
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#include <time.h>
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#else /* ANDROID */
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#include <time64.h>
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#endif /* ANDROID */
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#include <stdint.h> /*added for use if uint*_t data types*/
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/**
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* Parsed cron expression
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*/
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typedef struct {
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uint8_t seconds[8];
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uint8_t minutes[8];
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uint8_t hours[3];
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uint8_t days_of_week[1];
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uint8_t days_of_month[4];
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uint8_t months[2];
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} cron_expr;
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/**
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* Parses specified cron expression.
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*
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* @param expression cron expression as nul-terminated string,
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* should be no longer that 256 bytes
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* @param pointer to cron expression structure, it's client code responsibility
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* to free/destroy it afterwards
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* @param error output error message, will be set to string literal
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* error message in case of error. Will be set to NULL on success.
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* The error message should NOT be freed by client.
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*/
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void cron_parse_expr(const char* expression, cron_expr* target, const char** error);
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/**
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* Uses the specified expression to calculate the next 'fire' date after
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* the specified date. All dates are processed as UTC (GMT) dates
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* without timezones information. To use local dates (current system timezone)
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* instead of GMT compile with '-DCRON_USE_LOCAL_TIME'
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*
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* @param expr parsed cron expression to use in next date calculation
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* @param date start date to start calculation from
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* @return next 'fire' date in case of success, '((time_t) -1)' in case of error.
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*/
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time_t cron_next(cron_expr* expr, time_t date);
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/**
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* Uses the specified expression to calculate the previous 'fire' date after
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* the specified date. All dates are processed as UTC (GMT) dates
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* without timezones information. To use local dates (current system timezone)
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* instead of GMT compile with '-DCRON_USE_LOCAL_TIME'
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*
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* @param expr parsed cron expression to use in previous date calculation
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* @param date start date to start calculation from
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* @return previous 'fire' date in case of success, '((time_t) -1)' in case of error.
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*/
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time_t cron_prev(cron_expr* expr, time_t date);
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#if defined(__cplusplus) && !defined(CRON_COMPILE_AS_CXX)
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} /* extern "C"*/
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#endif
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#endif /* CCRONEXPR_H */
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