52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/* Copyright (C) 1991-2022 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
static char tmpnam_buffer[L_tmpnam];
|
|
|
|
/* Generate a unique filename in P_tmpdir.
|
|
|
|
This function is *not* thread safe! */
|
|
char *
|
|
tmpnam (char s[L_tmpnam])
|
|
{
|
|
/* By using two buffers we manage to be thread safe in the case
|
|
where S != NULL. */
|
|
char tmpbufmem[L_tmpnam];
|
|
char *tmpbuf = s ?: tmpbufmem;
|
|
|
|
/* 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 (__builtin_expect (__path_search (tmpbuf, L_tmpnam, NULL, NULL, 0),
|
|
0))
|
|
return NULL;
|
|
|
|
if (__glibc_unlikely (__gen_tempname (tmpbuf, 0, 0, __GT_NOCREATE)))
|
|
return NULL;
|
|
|
|
if (s == NULL)
|
|
return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam);
|
|
|
|
return s;
|
|
}
|
|
|
|
link_warning (tmpnam,
|
|
"the use of `tmpnam' is dangerous, better use `mkstemp'")
|