tree 8bc8acd85429e774a137f9f156cb60729d372c57
parent f65b00cac1163bbb0529d735a8097e93207e92cd
author Raman Tenneti <rtenneti@google.com> 1606799207 -0800
committer Copybara-Service <copybara-worker@google.com> 1607474924 -0800

Initial commit of mktime.

This introduces mktime to LLVM libc, based on C99/C2X/Single Unix Spec.

Co-authored-by: Jeff Bailey <jeffbailey@google.com>

This change doesn't handle TIMEZONE,  tm_isdst and leap seconds.  It returns -1 for invalid dates. I have verified the return results for all the possible dates with glibc's mktime.

TODO:
+ Handle leap seconds.
+ Handle out of range time and date values that don't overflow or underflow.
+ Implement the following suggestion Siva - As we start accumulating the seconds, we should be able to check if the next amount of seconds to be added can lead to an overflow. If it does, return the overflow value.  If not keep accumulating. The benefit is that, we don't have to validate every input, and also do not need the special cases for sizeof(time_t) == 4.
+ Handle timezone and update of tm_isdst

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D91551

GitOrigin-RevId: 6f0f844e9af98dc935f80d8149f6e4fcebddf8f1