| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1991,1993,1996-1999,2000 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, write to the Free |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 17 | 02111-1307 USA. */ |
| 18 | |
| 19 | #include <stdio.h> |
| 20 | #include <string.h> |
| 21 | #include "../misc/internals/tempname.h" |
| 22 | |
| 23 | |
| 24 | static char tmpnam_buffer[L_tmpnam]; |
| 25 | |
| 26 | /* Generate a unique filename in P_tmpdir. |
| 27 | |
| 28 | This function is *not* thread safe! */ |
| 29 | char * |
| 30 | tmpnam (char *s) |
| 31 | { |
| 32 | /* By using two buffers we manage to be thread safe in the case |
| 33 | where S != NULL. */ |
| 34 | char tmpbufmem[L_tmpnam]; |
| 35 | char *tmpbuf = s ?: tmpbufmem; |
| 36 | |
| 37 | /* In the following call we use the buffer pointed to by S if |
| 38 | non-NULL although we don't know the size. But we limit the size |
| 39 | to L_tmpnam characters in any case. */ |
| 40 | if (__builtin_expect (__path_search (tmpbuf, L_tmpnam, NULL, NULL, 0), |
| 41 | 0)) |
| 42 | return NULL; |
| 43 | |
| 44 | if (__builtin_expect (__gen_tempname (tmpbuf, __GT_NOCREATE, 0), 0)) |
| 45 | return NULL; |
| 46 | |
| 47 | if (s == NULL) |
| 48 | return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam); |
| 49 | |
| 50 | return s; |
| 51 | } |
| 52 | |
| 53 | link_warning (tmpnam, "the use of `tmpnam' is dangerous, better use `mkstemp'") |