Hi,
I wonder what is the simplest way to validate, from a C program, whether a
given string can be successfully parsed as TZ (timezone) environment
variable.
Thing is, tzset(3C) is not returning any error code. So if I putenv()
something into TZ, and do the tzset() afterwards, it'll "do something".
It'll simply set the global variables timezone/altzone/daylight/tzname[]
to 0/0/0/{"GMT", " "}.
But that's the same as specifying TZ=GMT (which is actually valid). So
it's not sufficient just testing for the tuple above.
It seems the thing I need to do to validate something is a usable TZ
environment variable is:
- putenv(); tzset()
- test for the above tuple
- additionally validate tzname[0] != <my TZ string>
Any better ideas ?
Thx,
FrankH.
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