diff options
Diffstat (limited to 'REORG.TODO/stdio-common/tmpnam.c')
-rw-r--r-- | REORG.TODO/stdio-common/tmpnam.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/REORG.TODO/stdio-common/tmpnam.c b/REORG.TODO/stdio-common/tmpnam.c new file mode 100644 index 0000000000..0ecc69ca04 --- /dev/null +++ b/REORG.TODO/stdio-common/tmpnam.c @@ -0,0 +1,51 @@ +/* Copyright (C) 1991-2017 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 (__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'") |