uclibc-ng/libc/stdio/tmpnam_r.c

/* 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>

extern int __path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
	       int try_tmpdir);
extern int __gen_tempname (char *tmpl, int openit);

/* Generate a unique filename in P_tmpdir.  If S is NULL return NULL.
   This makes this function thread safe.  */
char * tmpnam_r (char *s)
{
    if (s == NULL)
	return NULL;

    if (__path_search (s, L_tmpnam, NULL, NULL, 0))
	return NULL;
    if (__gen_tempname (s, 0))
	return NULL;

    return s;
}