1/* Utility to pick a temporary filename prefix.
2   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
3
4This file is part of the libiberty library.
5Libiberty is free software; you can redistribute it and/or
6modify it under the terms of the GNU Library General Public
7License as published by the Free Software Foundation; either
8version 2 of the License, or (at your option) any later version.
9
10Libiberty is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13Library General Public License for more details.
14
15You should have received a copy of the GNU Library General Public
16License along with libiberty; see the file COPYING.LIB.  If not,
17write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
18Boston, MA 02110-1301, USA.  */
19
20#ifdef HAVE_CONFIG_H
21#include "config.h"
22#endif
23
24#include <stdio.h>	/* May get P_tmpdir.  */
25#ifdef HAVE_STDLIB_H
26#include <stdlib.h>
27#endif
28#ifdef HAVE_STRING_H
29#include <string.h>
30#endif
31
32#include "libiberty.h"
33extern char *choose_tmpdir (void);
34
35/* Name of temporary file.
36   mktemp requires 6 trailing X's.  */
37#define TEMP_FILE "ccXXXXXX"
38#define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
39
40/*
41
42@deftypefn Extension char* choose_temp_base (void)
43
44Return a prefix for temporary file names or @code{NULL} if unable to
45find one.  The current directory is chosen if all else fails so the
46program is exited if a temporary directory can't be found (@code{mktemp}
47fails).  The buffer for the result is obtained with @code{xmalloc}.
48
49This function is provided for backwards compatibility only.  Its use is
50not recommended.
51
52@end deftypefn
53
54*/
55
56char *
57choose_temp_base (void)
58{
59  const char *base = choose_tmpdir ();
60  char *temp_filename;
61  int len;
62
63  len = strlen (base);
64  temp_filename = XNEWVEC (char, len + TEMP_FILE_LEN + 1);
65  strcpy (temp_filename, base);
66  strcpy (temp_filename + len, TEMP_FILE);
67
68  if (mktemp (temp_filename) == 0)
69    abort ();
70  return temp_filename;
71}
72