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/* Copyright (C) 1991, 1993, 1996, 1997, 1998 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Library General Public License as

   published by the Free Software Foundation; either version 2 of the

   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public

   License along with the GNU C Library; see the file COPYING.LIB.  If not,

   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include <stdio.h>

#include <string.h>

#include "../misc/internals/tempname.h"

static char tmpnam_buffer[L_tmpnam];

/* Generate a unique filename in P_tmpdir.

   This function is *not* thread safe when S == NULL!

*/

char * tmpnam (char *s)

{

    /* By using two buffers we manage to be thread safe in the case

       where S != NULL.  */

    char tmpbuf[L_tmpnam];

    /* In the following call we use the buffer pointed to by S if

       non-NULL although we don't know the size.  But we limit the size

       to L_tmpnam characters in any case.  */

    if (__path_search (s ? : tmpbuf, L_tmpnam, NULL, NULL, 0))

        return NULL;

    if (__gen_tempname (s ? : tmpbuf, __GT_NOCREATE))

        return NULL;

    if (s == NULL)

        return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam);

    return s;

}