CODEWITHSUNDEEP
ctimeembedded
Jason S
Jason S

Reputation: 189686

non-viral open-source implementations of mktime?

I'm working on microcontroller w/ a primitive standard library, and I need to convert a calendar time structure to a time-offset-from-epoch and back, ala struct tm <-> time_t. There's no built-in function available to do this.

Could anyone refer me to a decent implementation which is open-source licensed, usable in proprietary software? (i.e. non-LGPL/GPL)

I can probably write one on my own but figured I should see if I can get a head start.

Upvotes: 3

Views: 2432

Answers (2)

Jed Smith
Jed Smith

Reputation: 15944

Newlib is a non-GPL implementation of the standard library intended for embedded devices. It contains a mktime call. Some of the files within are GPL, however, so be careful which ones you utilize (full licensing terms).

I'm a big proponent in embedded work of not reinventing the standard library. You'll undoubtedly need more of it than just mktime, so it might be worth looking into.

Upvotes: 4

cnicutar
cnicutar

Reputation: 182649

I was just thinking that BSDs use their own libc when Neil Butterworth commented. Look in lib/libc/stdtime/localtime.c for mktime and time1. You should be able to rip time1 without problems.

Here it is: src/lib/libc/stdtime/Attic/localtime.c

Upvotes: 5

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