/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1998
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)os_tmpdir.c   10.3 (Sleepycat) 10/13/98";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <errno.h>
#include <stdlib.h>
#endif

#include "db_int.h"
#include "common_ext.h"

#ifdef macintosh
#include <TFileSpec.h>
#endif

/*
 * __os_tmpdir --
 *      Set the temporary directory path.
 *
 * The order of items in the list structure and the order of checks in
 * the environment are documented.
 *
 * PUBLIC: int __os_tmpdir __P((DB_ENV *, u_int32_t));
 */
int
__os_tmpdir(dbenv, flags)
        DB_ENV *dbenv;
        u_int32_t flags;
{
        /*
         * !!!
         * Don't change this to:
         *
         *      static const char * const list[]
         *
         * because it creates a text relocation in position independent code.
         */
        static const char * list[] = {
                "/var/tmp",
                "/usr/tmp",
                "/temp",                /* Windows. */
                "/tmp",
                "C:/temp",              /* Windows. */
                "C:/tmp",               /* Windows. */
                NULL
        };
        const char * const *lp, *p;

        /* Use the environment if it's permitted and initialized. */
        p = NULL;
#ifdef HAVE_GETEUID
        if (LF_ISSET(DB_USE_ENVIRON) ||
            (LF_ISSET(DB_USE_ENVIRON_ROOT) && getuid() == 0))
#else
        if (LF_ISSET(DB_USE_ENVIRON))
#endif
        {
                if ((p = getenv("TMPDIR")) != NULL && p[0] == '\0') {
                        __db_err(dbenv, "illegal TMPDIR environment variable");
                        return (EINVAL);
                }
                /* Windows */
                if (p == NULL && (p = getenv("TEMP")) != NULL && p[0] == '\0') {
                        __db_err(dbenv, "illegal TEMP environment variable");
                        return (EINVAL);
                }
                /* Windows */
                if (p == NULL && (p = getenv("TMP")) != NULL && p[0] == '\0') {
                        __db_err(dbenv, "illegal TMP environment variable");
                        return (EINVAL);
                }
                /* Macintosh */
                if (p == NULL &&
                    (p = getenv("TempFolder")) != NULL && p[0] == '\0') {
                        __db_err(dbenv,
                            "illegal TempFolder environment variable");
                        return (EINVAL);
                }
        }

#ifdef macintosh
        /* Get the path to the temporary folder. */
        if (p == NULL) {
                FSSpec spec;

                if (!Special2FSSpec(kTemporaryFolderType,
                    kOnSystemDisk, 0, &spec))
                        (void)__os_strdup(FSp2FullPath(&spec), &p);
        }
#endif

        /* Step through the list looking for a possibility. */
        if (p == NULL)
                for (lp = list; *lp != NULL; ++lp)
                        if (__os_exists(p = *lp, NULL) == 0)
                                break;
        if (p == NULL)
                return (0);

        return (__os_strdup(p, &dbenv->db_tmp_dir));
}