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e5448d7a | 1 | /* Copyright (C) 1991,1993,1996-1999,2000 Free Software Foundation, Inc. |
9d187dd4 UD |
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 | |
41bdb6e2 AJ |
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. | |
9d187dd4 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
9d187dd4 | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
28f540f4 | 18 | |
28f540f4 RM |
19 | #include <stdio.h> |
20 | #include <string.h> | |
21 | ||
2c86b2bc UD |
22 | static char tmpnam_buffer[L_tmpnam]; |
23 | ||
d68171ed UD |
24 | /* Generate a unique filename in P_tmpdir. |
25 | ||
26 | This function is *not* thread safe! */ | |
28f540f4 | 27 | char * |
d68171ed | 28 | tmpnam (char *s) |
28f540f4 | 29 | { |
d68171ed UD |
30 | /* By using two buffers we manage to be thread safe in the case |
31 | where S != NULL. */ | |
e658b54e | 32 | char tmpbufmem[L_tmpnam]; |
84a4fd33 | 33 | char *tmpbuf = s ?: tmpbufmem; |
d68171ed UD |
34 | |
35 | /* In the following call we use the buffer pointed to by S if | |
36 | non-NULL although we don't know the size. But we limit the size | |
7cabd57c | 37 | to L_tmpnam characters in any case. */ |
e658b54e UD |
38 | if (__builtin_expect (__path_search (tmpbuf, L_tmpnam, NULL, NULL, 0), |
39 | 0)) | |
7cabd57c UD |
40 | return NULL; |
41 | ||
e658b54e | 42 | if (__builtin_expect (__gen_tempname (tmpbuf, __GT_NOCREATE), 0)) |
7cabd57c | 43 | return NULL; |
d68171ed | 44 | |
7cabd57c | 45 | if (s == NULL) |
2c86b2bc UD |
46 | return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam); |
47 | ||
48 | return s; | |
28f540f4 | 49 | } |
e5448d7a UD |
50 | |
51 | link_warning (tmpnam, | |
52 | "the use of `tmpnam' is dangerous, better use `mkstemp'") |