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 two functions: choose_temp_base and make_temp_file. */
22 /* This file lives in at least two places: libiberty and gcc.
23 Don't change one without the other. */
25 /* $FreeBSD: src/contrib/gcc/choose-temp.c,v 1.3 1999/11/04 10:23:25 obrien Exp $ */
31 #include <stdio.h> /* May get P_tmpdir. */
32 #include <sys/types.h>
39 #ifdef HAVE_SYS_FILE_H
40 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
49 #include "libiberty.h"
50 extern int mkstemps ();
53 #if defined (__MSDOS__) || (defined (_WIN32) && ! defined (__CYGWIN__) && ! defined (_UWIN))
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.
101 This function is provided for backwards compatability only. It use
102 is not recommended. */
110 static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
111 static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
113 base = try (getenv ("TMPDIR"), base);
114 base = try (getenv ("TMP"), base);
115 base = try (getenv ("TEMP"), base);
117 base = try (tmp, base);
120 base = try (P_tmpdir, base);
123 /* Try /usr/tmp even though it usually doesn't exist on FreeBSD. */
124 base = try (usrtmp, base);
126 /* If all else fails, use the current directory! */
131 temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/
132 + strlen (TEMP_FILE) + 1);
133 strcpy (temp_filename, base);
136 && temp_filename[len-1] != '/'
137 && temp_filename[len-1] != DIR_SEPARATOR)
138 temp_filename[len++] = DIR_SEPARATOR;
139 strcpy (temp_filename + len, TEMP_FILE);
141 mktemp (temp_filename);
142 if (strlen (temp_filename) == 0)
144 return temp_filename;
146 /* Return a temporary file name (as a string) or NULL if unable to create
150 make_temp_file (suffix)
155 int base_len, suffix_len;
157 static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
158 static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
160 base = try (getenv ("TMPDIR"), base);
161 base = try (getenv ("TMP"), base);
162 base = try (getenv ("TEMP"), base);
164 base = try (tmp, base);
167 base = try (P_tmpdir, base);
170 /* Try /usr/tmp even though it usually doesn't exist on FreeBSD. */
171 base = try (usrtmp, base);
173 /* If all else fails, use the current directory! */
177 base_len = strlen (base);
180 suffix_len = strlen (suffix);
184 temp_filename = xmalloc (base_len + 1 /*DIR_SEPARATOR*/
187 strcpy (temp_filename, base);
190 && temp_filename[base_len-1] != '/'
191 && temp_filename[base_len-1] != DIR_SEPARATOR)
192 temp_filename[base_len++] = DIR_SEPARATOR;
193 strcpy (temp_filename + base_len, TEMP_FILE);
196 strcat (temp_filename, suffix);
198 fd = mkstemps (temp_filename, suffix_len);
199 /* If mkstemps failed, then something bad is happening. Maybe we should
200 issue a message about a possible security attack in progress? */
203 /* Similarly if we can not close the file. */
206 return temp_filename;