[PATCH] strftime: use tzname if TM_ZONE is NULL

[Yaakov Selkowitz]

On Wed, 2015-03-25 at 16:46 -0500, Yaakov Selkowitz wrote:
> * libc/time/strftime.c (strftime) <%Z>: Initialize tznam to NULL.
> Use _tzname as fallback if TM_ZONE is NULL.
> ---
> The crash was due to a strlen(NULL) a few lines later, which should NOT
> happen.  glibc takes this a step further and calls tzset() if not yet
> called so that the returned string matches the local timezone (instead
> of "GMT", or on Cygwin, "   ").  The question is how to (portably)
> determine if tzset() has been called already or not (e.g. a global
> variable?).

Craig's patch would take care of this, so I'd like to repropose this
patch as is.

-- 
Yaakov Selkowitz
Associate Software Engineer, ARM
Red Hat, Inc.