1/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <stdio.h>
19#include <string.h>
20
21/* Generate a unique temporary filename using up to five characters of
22 PFX if it is not NULL. The directory to put this file in is
23 searched for as follows: First the environment variable "TMPDIR" is
24 checked. If it contains the name of a directory, that directory is
25 used. If not and if DIR is not NULL, that value is checked. If
26 that fails, P_tmpdir is tried and finally "/tmp". The storage for
27 the filename is allocated by `malloc'. */
28char *
29tempnam (const char *dir, const char *pfx)
30{
31 char buf[FILENAME_MAX];
32
33 if (__path_search (buf, FILENAME_MAX, dir, pfx, 1))
34 return NULL;
35
36 if (__gen_tempname (buf, 0, 0, __GT_NOCREATE))
37 return NULL;
38
39 return __strdup (buf);
40}
41
42link_warning (tempnam,
43 "the use of `tempnam' is dangerous, better use `mkstemp'")
44