1 /* Utility to pick a temporary filename prefix.
2 Copyright (C) 1996, 1997, 1998, 2001 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. */
26 #include <stdio.h> /* May get P_tmpdir. */
27 #include <sys/types.h>
37 #ifdef HAVE_SYS_FILE_H
38 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
47 #include "libiberty.h"
48 extern int mkstemps PARAMS ((char *, int));
50 /* '/' works just fine on MS-DOS based systems. */
52 #define DIR_SEPARATOR '/'
55 /* Name of temporary file.
56 mktemp requires 6 trailing X's. */
57 #define TEMP_FILE "ccXXXXXX"
58 #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
60 /* Subroutine of choose_tmpdir.
61 If BASE is non-NULL, return it.
62 Otherwise it checks if DIR is a usable directory.
63 If success, DIR is returned.
64 Otherwise NULL is returned. */
66 static inline const char *try PARAMS ((const char *, const char *));
68 static inline const char *
70 const char *dir, *base;
75 && access (dir, R_OK | W_OK | X_OK) == 0)
80 static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
81 static const char usrtmp[] =
82 { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
83 static const char vartmp[] =
84 { DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
86 static char *memoized_tmpdir;
90 @deftypefn Replacement char* choose_tmpdir ()
92 Returns a pointer to a directory path suitable for creating temporary
102 const char *base = 0;
107 return memoized_tmpdir;
109 base = try (getenv ("TMPDIR"), base);
110 base = try (getenv ("TMP"), base);
111 base = try (getenv ("TEMP"), base);
114 base = try (P_tmpdir, base);
117 /* Try /tmp, /var/tmp, then /usr/tmp. */
118 base = try (tmp, base);
119 base = try (vartmp, base);
120 base = try (usrtmp, base);
122 /* If all else fails, use the current directory! */
126 /* Append DIR_SEPARATOR to the directory we've chosen
129 tmpdir = xmalloc (len + 2);
130 strcpy (tmpdir, base);
131 tmpdir[len] = DIR_SEPARATOR;
132 tmpdir[len+1] = '\0';
134 memoized_tmpdir = tmpdir;
140 @deftypefn Replacement char* make_temp_file (const char *@var{suffix})
142 Return a temporary file name (as a string) or @code{NULL} if unable to
143 create one. @var{suffix} is a suffix to append to the file name. The
144 string is @code{malloc}ed, and the temporary file has been created.
151 make_temp_file (suffix)
154 const char *base = choose_tmpdir ();
156 int base_len, suffix_len;
162 base_len = strlen (base);
163 suffix_len = strlen (suffix);
165 temp_filename = xmalloc (base_len
168 strcpy (temp_filename, base);
169 strcpy (temp_filename + base_len, TEMP_FILE);
170 strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix);
172 fd = mkstemps (temp_filename, suffix_len);
173 /* If mkstemps failed, then something bad is happening. Maybe we should
174 issue a message about a possible security attack in progress? */
177 /* Similarly if we can not close the file. */
180 return temp_filename;