| /* Copyright (C) 1991-2014 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 |
| <http://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) |
| { |
| /* 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 (__builtin_expect (__gen_tempname (tmpbuf, 0, 0, __GT_NOCREATE), 0)) |
| return NULL; |
| |
| if (s == NULL) |
| return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam); |
| |
| return s; |
| } |
| |
| #if 0 /* Google-local: b/6115789 */ |
| link_warning (tmpnam, |
| "the use of `tmpnam' is dangerous, better use `mkstemp'") |
| #endif |
