[[e-mail]: Re: [php-maint] Bug#535770: PHP system timezone patch for 5.3?]

[Joe Orton]

Forwarding since Sean's mail is not making it through.

----- Forwarded message from sean finney  -----

From: sean finney 
To: PHP Packagers ,
    [e-mail], [e-mail],
    [e-mail]
Date: Wed, 15 Jul 2009 01:14:46 +0200
Subject: Re: [php-maint] Bug#535770: PHP system timezone patch for 5.3?
User-Agent: Mutt/1.5.20 (2009-06-14)

hi joe,

some quick notes/observations...

in your comments you say:

/* Parse an ISO-6709 date as used in zone.tab. Returns end of the

s/date/coordinate/ ? :)

but more seriously:

* in create_zone_index() it looks like
  find_zone_info(system_zone_info...) is called but system_zone_info
  isn't initialized until after create_zone_index has returned.

* i'm not sure but it seems like there might be a few corresponding free()'s
  missing from the mallocs/strdups.

* it looks like load_zone_table() is called unconditionally, even if
  it's not needed (i.e. a scall to localtime() will trigger it)

* is parsing the comments really necessary?  i don't see any php functions
  that use them.

also, before i came to the conclusion that some kind of intermediate
hashtable was needed to do the mapping (at which point i gave up and
figured i'd wait to hear back from you :), i had done a slightly 
simpler implementation of the parsing using a clean mmap'd buffer
and sscanf with "%ms" type formats which avoids a lot of the hard-coded
lengths etc[1].  if you're interested i can hack that code into the
load_zone_info (and parse_iso6709) to make a leaner/cleaner/more efficient
implementation.

also, FYI my posts to the fedora list are being automatically rejected
so if i say anything important that should be shared someone should
forward it along :)

sean

[1] 'm' being the sooner-or-later POSIX.1 adoption of the non-standard 'a'
    GNU libc extension to automatically allocate the parsed strings, which 
    in turn conflicted with the C99 'a' (float) format specifier, hence
    the new specifier.  it requires glibc >= 2.7 btw.

----- End forwarded message -----