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)
29 /* If we are in gcc, or we have a config.h, we assume that
30 HAVE_SYS_FILE_H tells us whether to include sys/file.h. However,
31 libiberty does not have a config.h, and instead arranges to define
32 NO_SYS_FILE_H on the command line when there is no sys/file.h. */
34 #if (defined (IN_GCC) || defined (HAVE_CONFIG_H)) ? defined (HAVE_SYS_FILE_H) : ! defined (NO_SYS_FILE_H)
35 #include <sys/types.h>
36 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
45 #include <stdio.h> /* May get P_tmpdir. */
48 #include "gansidecl.h"
49 extern char *xmalloc ();
52 #include "libiberty.h"
53 #if defined (__MSDOS__) || defined (_WIN32)
54 #define DIR_SEPARATOR '\\'
59 #define DIR_SEPARATOR '/'
62 /* On MSDOS, write temp files in current dir
63 because there's no place else we can expect to use. */
64 /* ??? Although the current directory is tried as a last resort,
65 this is left in so that on MSDOS it is preferred to /tmp on the
66 off chance that someone requires this, since that was the previous
74 /* Name of temporary file.
75 mktemp requires 6 trailing X's. */
76 #define TEMP_FILE "ccXXXXXX"
78 /* Subroutine of choose_temp_base.
79 If BASE is non-NULL, return it.
80 Otherwise it checks if DIR is a usable directory.
81 If success, DIR is returned.
82 Otherwise NULL is returned. */
91 && access (dir, R_OK | W_OK | X_OK) == 0)
96 /* Return a prefix for temporary file names or NULL if unable to find one.
97 The current directory is chosen if all else fails so the program is
98 exited if a temporary directory can't be found (mktemp fails).
99 The buffer for the result is obtained with xmalloc. */
107 static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
108 static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
111 base = try (getenv ("TMPDIR"), base);
112 base = try (getenv ("TMP"), base);
113 base = try (getenv ("TEMP"), base);
116 base = try (P_tmpdir, base);
119 /* Try /usr/tmp, then /tmp. */
120 base = try (usrtmp, base);
121 base = try (tmp, base);
123 /* If all else fails, use the current directory! */
132 temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/
133 + strlen (TEMP_FILE) + 1);
134 strcpy (temp_filename, base);
138 && temp_filename[len-1] != '/'
139 && temp_filename[len-1] != DIR_SEPARATOR)
140 temp_filename[len++] = DIR_SEPARATOR;
142 if (temp_filename[len-1] != ':')
143 temp_filename[len++] = ':';
145 strcpy (temp_filename + len, TEMP_FILE);
147 mktemp (temp_filename);
148 if (strlen (temp_filename) == 0)
150 return temp_filename;