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1 /* Utility to pick a temporary filename prefix.
2 Copyright (C) 1996-2020 Free Software Foundation, Inc.
3
4 This file is part of the libiberty library.
5 Libiberty is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 Libiberty is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with libiberty; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
18 Boston, 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 #include <sys/types.h>
26 #ifdef HAVE_UNISTD_H
27 #include <unistd.h>
28 #endif
29 #ifdef HAVE_STDLIB_H
30 #include <stdlib.h>
31 #endif
32 #ifdef HAVE_STRING_H
33 #include <string.h>
34 #endif
35
36 #include "libiberty.h"
37
38 /* Name of temporary file.
39 mktemp requires 6 trailing X's. */
40 #define TEMP_FILE "ccXXXXXX"
41 #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
42
43 /*
44
45 @deftypefn Extension char* choose_temp_base (void)
46
47 Return a prefix for temporary file names or @code{NULL} if unable to
48 find one. The current directory is chosen if all else fails so the
49 program is exited if a temporary directory can't be found (@code{mktemp}
50 fails). The buffer for the result is obtained with @code{xmalloc}.
51
52 This function is provided for backwards compatibility only. Its use is
53 not recommended.
54
55 @end deftypefn
56
57 */
58
59 char *
60 choose_temp_base (void)
61 {
62 const char *base = choose_tmpdir ();
63 char *temp_filename;
64 int len;
65
66 len = strlen (base);
67 temp_filename = XNEWVEC (char, len + TEMP_FILE_LEN + 1);
68 strcpy (temp_filename, base);
69 strcpy (temp_filename + len, TEMP_FILE);
70
71 if (mktemp (temp_filename) == 0)
72 abort ();
73 return temp_filename;
74 }