1 /* Copyright (C) 1991, 1992, 1996, 1998 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. */
37 #define __set_errno(x) errno=(x)
43 /* Generate a unique temporary file name from TEMPLATE.
44 The last six characters of TEMPLATE must be "XXXXXX";
45 they are replaced with a string that makes the filename unique.
46 Returns a file descriptor open on the file for reading and writing. */
51 static const char letters[]
52 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
56 len = strlen (template);
57 if (len < 6 || strcmp (&template[len - 6], "XXXXXX"))
63 if (sprintf (&template[len - 5], "%.5u",
64 (unsigned int) getpid () % 100000) != 5)
65 /* Inconceivable lossage. */
68 for (i = 0; i < sizeof (letters); ++i)
72 template[len - 6] = letters[i];
74 fd = open (template, O_RDWR|O_BINARY|O_CREAT|O_EXCL, 0600);
79 /* We return the null string if we can't find a unique file name. */