/*
* Load a timezone from file or from cache.
* Does not verify that the timezone is acceptable!
*/
struct pg_tz *
pg_tzset(const char *name)
{
pg_tz_cache *tzp;
struct state tzstate;
char uppername[TZ_STRLEN_MAX + 1];
char canonname[TZ_STRLEN_MAX + 1];
char *p;
if (strlen(name) > TZ_STRLEN_MAX)
return NULL; /* not going to fit */
if (!timezone_cache)
if (!init_timezone_hashtable())
return NULL;
/*
* Upcase the given name to perform a case-insensitive hashtable search.
* (We could alternatively downcase it, but we prefer upcase so that we
* can get consistently upcased results from tzparse() in case the name is
* a POSIX-style timezone spec.)
*/
p = uppername;
while (*name)
*p++ = pg_toupper((unsigned char) *name++);
*p = '\0';
tzp = (pg_tz_cache *) hash_search(timezone_cache,
uppername,
HASH_FIND,
NULL);
if (tzp)
{
/* Timezone found in cache, nothing more to do */
return &tzp->tz;
}
if (tzload(uppername, canonname, &tzstate, TRUE) != 0)
{
if (uppername[0] == ':' || tzparse(uppername, &tzstate, FALSE) != 0)
{
/* Unknown timezone. Fail our call instead of loading GMT! */
return NULL;
}
/* For POSIX timezone specs, use uppercase name as canonical */
strcpy(canonname, uppername);
}
/* Save timezone in the cache */
tzp = (pg_tz_cache *) hash_search(timezone_cache,
uppername,
HASH_ENTER,
NULL);
/* hash_search already copied uppername into the hash key */
strcpy(tzp->tz.TZname, canonname);
memcpy(&tzp->tz.state, &tzstate, sizeof(tzstate));
return &tzp->tz;
}
/*
* Load a timezone from file or from cache.
* Does not verify that the timezone is acceptable!
*/
struct pg_tz *
pg_tzset(const char *name)
{
pg_tz *tzp;
pg_tz tz;
if (strlen(name) > TZ_STRLEN_MAX)
return NULL; /* not going to fit */
if (!timezone_cache)
if (!init_timezone_hashtable())
return NULL;
tzp = (pg_tz *) hash_search(timezone_cache,
name,
HASH_FIND,
NULL);
if (tzp)
{
/* Timezone found in cache, nothing more to do */
return tzp;
}
if (tzload(name, &tz.state) != 0)
{
if (name[0] == ':' || tzparse(name, &tz.state, FALSE) != 0)
{
/* Unknown timezone. Fail our call instead of loading GMT! */
return NULL;
}
}
strcpy(tz.TZname, name);
/* Save timezone in the cache */
tzp = hash_search(timezone_cache,
name,
HASH_ENTER,
NULL);
strcpy(tzp->TZname, tz.TZname);
memcpy(&tzp->state, &tz.state, sizeof(tz.state));
return tzp;
}