I'm looking for a way to determine the next run of a cronjob based on the current time (or any other timestamp) and a cronline. While supporting the different formats that cron supports. Is anybody aware of a function or library or component for this?
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Yes, that is exactly what I need, how do I parse it and make a timestamp. Pseudo code is alright. I already created a function that can extract the paramters list / ranges / steppings / wildcards into arrays of numbers. But how do i make a timestamp from that which is the next availablue run datetime.
I couldn't find a readymade C++ crontab parser.
If you already got an array of values made from the crontab line, you can get the actual time with time.h functions, put it in numerical values (timestamp->string->int) and then do a mere subtraction. The result will be time left before the next cron job. If you need to output the value in screen, with a little arithmetics you can format it in a proper hh:mm:ss and else timestamp
There is a ready-made crontab parser - it is called 'cron': http://cvs.savannah.gnu.or
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by: ai_ja_naiPosted on 2009-03-11 at 07:42:26ID: 23857817
if you've got the cronline as a string, you can parse it and build a timestamp. I assume that you know the meaning of symbols (in case, it's minute hour dayofmonth month dayofweek username cmd; * means no parameter).
Or maybe I did not understand and you are looking for a library to get cronlines from crontab, aren't you?