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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/posix/mkstemp.c
1 /* Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
26 /* Generate a unique temporary file name from TEMPLATE.
27 The last six characters of TEMPLATE must be "XXXXXX";
28 they are replaced with a string that makes the filename unique.
29 Returns a file descriptor open on the file for reading and writing. */
34 static const char letters
[]
35 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
39 len
= strlen (template);
40 if (len
< 6 || strcmp (&template[len
- 6], "XXXXXX"))
46 if (sprintf (&template[len
- 5], "%.5u",
47 (unsigned int) getpid () % 100000) != 5)
48 /* Inconceivable lossage. */
51 for (i
= 0; i
< sizeof (letters
); ++i
)
55 template[len
- 6] = letters
[i
];
57 fd
= open (template, O_RDWR
|O_CREAT
|O_EXCL
, 0666);
62 /* We return the null string if we can't find a unique file name. */