forked from vieter-v/libvieter
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#ifndef VIETER_CRON
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#define VIETER_CRON
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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typedef enum vieter_cron_parse_error {
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vieter_cron_parse_ok = 0,
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vieter_cron_parse_invalid_expression = 1,
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vieter_cron_parse_invalid_number = 2,
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vieter_cron_parse_out_of_range = 3,
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vieter_cron_parse_too_many_parts = 4,
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vieter_cron_parse_not_enough_parts = 5
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} vieter_cron_parse_error;
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typedef struct vieter_cron_expression {
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uint8_t *minutes;
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uint8_t *hours;
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uint8_t *days;
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uint8_t *months;
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uint8_t minute_count;
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uint8_t hour_count;
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uint8_t day_count;
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uint8_t month_count;
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} vieter_cron_expression;
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typedef struct vieter_cron_simple_time {
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int year;
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int month;
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int day;
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int hour;
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int minute;
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} vieter_cron_simple_time;
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/*
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* Allocate and initialize a new empty cron expression.
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*/
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vieter_cron_expression *ce_init();
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/*
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* Deallocate a cron expression.
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*/
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void vieter_cron_expr_free(vieter_cron_expression *ce);
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/*
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* Given a cron expression and a reference time, calculate the next time after
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* the reference time that this expression matches.
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*/
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void vieter_cron_expr_next(vieter_cron_simple_time *out,
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vieter_cron_expression *ce,
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vieter_cron_simple_time *ref);
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/*
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* Convencience wrapper around vieter_cron_expr_next that uses the current time
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* as the reference time.
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*/
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void vieter_cron_expr_next_from_now(vieter_cron_simple_time *out,
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vieter_cron_expression *ce);
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/*
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* Try to parse a string into a cron expression. Note that the cron expression
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* is updated in-place, meaning it can contain invalid information if the
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* function returns an error. The cron expression should only be used if the
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* function succeeded.
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*/
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vieter_cron_parse_error vieter_cron_expr_parse(vieter_cron_expression *out,
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const char *expression);
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#endif
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