1 /* Utility to pick a temporary filename prefix.
2 Copyright (C) 1996 Free Software Foundation, Inc.
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.
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.
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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 /* This file exports one function: choose_temp_base. */
22 #if ! defined (_WIN32) && ! defined (NO_SYS_FILE_H)
23 #include <sys/types.h>
24 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
33 #include <stdio.h> /* May get P_tmpdir. */
37 #include "gansidecl.h"
38 extern char *xmalloc ();
41 #include "libiberty.h"
42 #if defined (__MSDOS__) || defined (_WIN32)
43 #define DIR_SEPARATOR '\\'
48 #define DIR_SEPARATOR '/'
51 /* On MSDOS, write temp files in current dir
52 because there's no place else we can expect to use. */
53 /* ??? Although the current directory is tried as a last resort,
54 this is left in so that on MSDOS it is prefered to /tmp on the
55 off chance that someone requires this, since that was the previous
63 /* Name of temporary file.
64 mktemp requires 6 trailing X's. */
65 #define TEMP_FILE "ccXXXXXX"
67 /* Subroutine of choose_temp_base.
68 If BASE is non-NULL, returh it.
69 Otherwise it checks if DIR is a usable directory.
70 If success, DIR is returned.
71 Otherwise NULL is returned. */
80 && access (dir, R_OK | W_OK) == 0)
85 /* Return a prefix for temporary file names or NULL if unable to find one.
86 The current directory is chosen if all else fails so the program is
87 exited if a temporary directory can't be found (mktemp fails).
88 The buffer for the result is obtained with xmalloc. */
96 static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
97 static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
100 base = try (getenv ("TMPDIR"), base);
101 base = try (getenv ("TMP"), base);
102 base = try (getenv ("TEMP"), base);
105 base = try (P_tmpdir, base);
108 /* Try /usr/tmp, then /tmp. */
109 base = try (usrtmp, base);
110 base = try (tmp, base);
112 /* If all else fails, use the current directory! */
123 temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/
124 + strlen (TEMP_FILE) + 1);
125 strcpy (temp_filename, base);
128 if (temp_filename[len-1] != '/'
129 && temp_filename[len-1] != DIR_SEPARATOR)
130 temp_filename[len++] = DIR_SEPARATOR;
132 if (temp_filename[len-1] != ':')
133 temp_filename[len++] = ':';
135 strcpy (temp_filename + len, TEMP_FILE);
137 mktemp (temp_filename);
138 if (strlen (temp_filename) == 0)
140 return temp_filename;