| 1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <stdio.h> |
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| 19 | #include <string.h> |
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| 20 | |
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| 21 | static char tmpnam_buffer[L_tmpnam]; |
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| 22 | |
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| 23 | /* Generate a unique filename in P_tmpdir. |
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| 24 | |
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| 25 | This function is *not* thread safe! */ |
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| 26 | char * |
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| 27 | tmpnam (char s[L_tmpnam]) |
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| 28 | { |
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| 29 | /* By using two buffers we manage to be thread safe in the case |
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| 30 | where S != NULL. */ |
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| 31 | char tmpbufmem[L_tmpnam]; |
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| 32 | char *tmpbuf = s ?: tmpbufmem; |
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| 33 | |
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| 34 | /* In the following call we use the buffer pointed to by S if |
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| 35 | non-NULL although we don't know the size. But we limit the size |
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| 36 | to L_tmpnam characters in any case. */ |
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| 37 | if (__builtin_expect (__path_search (tmpl: tmpbuf, L_tmpnam, NULL, NULL, try_tempdir: 0), |
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| 38 | 0)) |
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| 39 | return NULL; |
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| 40 | |
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| 41 | if (__glibc_unlikely (__gen_tempname (tmpbuf, 0, 0, __GT_NOCREATE))) |
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| 42 | return NULL; |
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| 43 | |
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| 44 | if (s == NULL) |
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| 45 | return (char *) memcpy (tmpnam_buffer, tmpbuf, L_tmpnam); |
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| 46 | |
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| 47 | return s; |
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| 48 | } |
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| 49 | |
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| 50 | link_warning (tmpnam, |
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| 51 | "the use of `tmpnam' is dangerous, better use `mkstemp'" ) |
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| 52 | |
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