Raman Tenneti 6f0f844e9a 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
2020-11-30 21:07:16 -08:00

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set(TARGET_PUBLIC_HEADERS
libc.include.assert_h
libc.include.ctype
libc.include.errno
libc.include.math
libc.include.signal
libc.include.stdio
libc.include.stdlib
libc.include.sys_mman
libc.include.sys_syscall
libc.include.threads
libc.include.time
libc.include.unistd
)