Question

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.

Answer 1

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