[libc-commits] [libc] [libc] Add `ctime_s` (PR #110676)

[Victor Campos via libc-commits]

================

----------------
vhscampos wrote:

The C standard says this about the return: "The ctime_s function returns zero if the time was successfully converted and stored into the array pointed to by s. Otherwise, it returns a nonzero value."

Hence I believe that returning error codes is overspecific. It might come back to bite us if we ever decided to backtrack. Instead, I believe we should decide on one default errno_t value that ought to be returned every time on failure. I plan to add a macro for this default errno_t value that we can use here.

https://github.com/llvm/llvm-project/pull/110676