1 /* Utility to pick a temporary filename prefix.
2 Copyright (C) 1996, 1997, 1998 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 /* This file lives in at least two places: libiberty and gcc.
23 Don't change one without the other. */
25 #if defined (IN_GCC) || defined (HAVE_CONFIG_H)
33 /* If we are in gcc, system.h has handled everything. When not in
34 gcc, if we have a config.h we assume that HAVE_SYS_FILE_H tells us
35 whether to include sys/file.h. However, libiberty does not have a
36 config.h, and instead arranges to define NO_SYS_FILE_H on the
37 command line when there is no sys/file.h. */
39 #if defined (HAVE_CONFIG_H) ? defined (HAVE_SYS_FILE_H) : ! defined (NO_SYS_FILE_H)
40 #include <sys/types.h>
41 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
50 #include <stdio.h> /* May get P_tmpdir. */
54 #include "gansidecl.h"
55 extern char *xmalloc ();
58 #include "libiberty.h"
59 #if defined (__MSDOS__) || defined (_WIN32)
60 #define DIR_SEPARATOR '\\'
65 #define DIR_SEPARATOR '/'
68 /* On MSDOS, write temp files in current dir
69 because there's no place else we can expect to use. */
70 /* ??? Although the current directory is tried as a last resort,
71 this is left in so that on MSDOS it is preferred to /tmp on the
72 off chance that someone requires this, since that was the previous
80 /* Name of temporary file.
81 mktemp requires 6 trailing X's. */
82 #define TEMP_FILE "ccXXXXXX"
84 /* Subroutine of choose_temp_base.
85 If BASE is non-NULL, return it.
86 Otherwise it checks if DIR is a usable directory.
87 If success, DIR is returned.
88 Otherwise NULL is returned. */
97 && access (dir
, R_OK
| W_OK
| X_OK
) == 0)
102 /* Return a prefix for temporary file names or NULL if unable to find one.
103 The current directory is chosen if all else fails so the program is
104 exited if a temporary directory can't be found (mktemp fails).
105 The buffer for the result is obtained with xmalloc. */
113 static char tmp
[] = { DIR_SEPARATOR
, 't', 'm', 'p', 0 };
114 static char usrtmp
[] = { DIR_SEPARATOR
, 'u', 's', 'r', DIR_SEPARATOR
, 't', 'm', 'p', 0 };
117 base
= try (getenv ("TMPDIR"), base
);
118 base
= try (getenv ("TMP"), base
);
119 base
= try (getenv ("TEMP"), base
);
122 base
= try (P_tmpdir
, base
);
125 /* Try /usr/tmp, then /tmp. */
126 base
= try (usrtmp
, base
);
127 base
= try (tmp
, base
);
129 /* If all else fails, use the current directory! */
138 temp_filename
= xmalloc (len
+ 1 /*DIR_SEPARATOR*/
139 + strlen (TEMP_FILE
) + 1);
140 strcpy (temp_filename
, base
);
144 && temp_filename
[len
-1] != '/'
145 && temp_filename
[len
-1] != DIR_SEPARATOR
)
146 temp_filename
[len
++] = DIR_SEPARATOR
;
148 if (temp_filename
[len
-1] != ':')
149 temp_filename
[len
++] = ':';
151 strcpy (temp_filename
+ len
, TEMP_FILE
);
153 mktemp (temp_filename
);
154 if (strlen (temp_filename
) == 0)
156 return temp_filename
;