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Someday I might forgive the standards bodies for omitting timegm().

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Maybe.  In the meantime, my workarounds for trying to coax UTC without
timegm() are getting uglier and uglier.  Apparently, some systems
don't support setenv()/unsetenv(), so you can't set the TZ env var and
hope thereby to coax mktime() into generating UTC.  Without that, I
don't see a really good alternative to just giving up and converting to
localtime with mktime().  (I suppose I should research the Perl library
approach for computing an inverse function to gmtime(); that might
actually be simpler than this growing list of hacks.)
This commit is contained in:
Tim Kientzle 2008-02-19 06:02:01 +00:00
parent 334a6ee707
commit 54c845efb9
1 changed files with 9 additions and 5 deletions
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14
lib/libarchive/archive_read_support_format_iso9660.c
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@ -1064,24 +1064,28 @@ time_from_tm(struct tm *t)
if (t->tm_isdst)
t->tm_hour -= 1;
return (mktime(t)); /* Re-convert. */
#else
/*
* If you don't have tm_gmtoff, let's try resetting the timezone
* (yecch!).
*/
#elif defined(HAVE_SETENV) && defined(HAVE_UNSETENV) && defined(HAVE_TZSET)
/* No timegm() and no tm_gmtoff, let's try forcing mktime() to UTC. */
time_t ret;
char *tz;
/* Reset the timezone, remember the old one. */
tz = getenv("TZ");
setenv("TZ", "UTC 0", 1);
tzset();
ret = mktime(t);
/* Restore the previous timezone. */
if (tz)
setenv("TZ", tz, 1);
else
unsetenv("TZ");
tzset();
return ret;
#else
/* <sigh> We have no choice but to use localtime instead of UTC. */
return (mktime(t));
#endif
}