/*-------------------------------------------------------------------------
 *
 * pgtz.c
 *	  Timezone Library Integration Functions
 *
 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/timezone/pgtz.c,v 1.7 2004/05/02 03:12:12 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */

#include "pgtz.h"
#include "tzfile.h"


static char tzdir[MAXPGPATH];
static int	done_tzdir = 0;
char *
pg_TZDIR(void)
{
	char	   *p;

	if (done_tzdir)
		return tzdir;

#ifndef WIN32
	StrNCpy(tzdir, PGDATADIR, MAXPGPATH);
#else
	if (GetModuleFileName(NULL, tzdir, MAXPGPATH) == 0)
		return NULL;
#endif

	canonicalize_path(tzdir);
#ifdef WIN32
	/* trim off binary name, then go up a directory */
	if ((p = last_path_separator(tzdir)) == NULL)
		return NULL;
	else
		*p = '\0';
	strcat(tzdir, "/../share");
#endif
	strcat(tzdir, "/timezone");

	done_tzdir = 1;
	return tzdir;
}