Re: CVS commit: src/lib/libc/time

[Alan Barrett <apb%cequrux.com@localhost>]

On Thu, 01 Aug 2013, David Holland wrote:
> (I thought time_t was required to be an integer type, but I suppose
> there's some legacy platform where it isn't.)

C99 requires time_t to be an arithmetic type.

    C99 section 7.23.1 point 3 "The types declared are ... clock_t and
    time_t which are arithmetic types capable of representing
    times; ..."

POSIX adds that time_t must be an integer type.

    <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html>
    "clock_t shall be an integer or real-floating type. [CX] [Option
    Start] time_t shall be an integer type. [Option End]"

    (The "[CX][Option Start]...[Option End]" just means "Extension to he
    ISO C standard".)

The tzcode implementation goes to some trouble to be portable to 
environments with integer or floating point types for time_t.

--apb (Alan Barrett)