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. */
24 #include <stdio.h> /* May get P_tmpdir. */
25 #include <sys/types.h>
35 #ifdef HAVE_SYS_FILE_H
36 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
45 #include "libiberty.h"
46 extern int mkstemps
PARAMS ((char *, int));
48 /* '/' works just fine on MS-DOS based systems. */
50 #define DIR_SEPARATOR '/'
53 /* Name of temporary file.
54 mktemp requires 6 trailing X's. */
55 #define TEMP_FILE "ccXXXXXX"
56 #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
58 /* Subroutine of choose_tmpdir.
59 If BASE is non-NULL, return it.
60 Otherwise it checks if DIR is a usable directory.
61 If success, DIR is returned.
62 Otherwise NULL is returned. */
64 static inline const char *try PARAMS ((const char *, const char *));
66 static inline const char *
68 const char *dir
, *base
;
73 && access (dir
, R_OK
| W_OK
| X_OK
) == 0)
78 static const char tmp
[] = { DIR_SEPARATOR
, 't', 'm', 'p', 0 };
79 static const char usrtmp
[] =
80 { DIR_SEPARATOR
, 'u', 's', 'r', DIR_SEPARATOR
, 't', 'm', 'p', 0 };
81 static const char vartmp
[] =
82 { DIR_SEPARATOR
, 'v', 'a', 'r', DIR_SEPARATOR
, 't', 'm', 'p', 0 };
84 static char *memoized_tmpdir
;
88 @deftypefn Replacement char* choose_tmpdir ()
90 Returns a pointer to a directory path suitable for creating temporary
100 const char *base
= 0;
105 return memoized_tmpdir
;
107 base
= try (getenv ("TMPDIR"), base
);
108 base
= try (getenv ("TMP"), base
);
109 base
= try (getenv ("TEMP"), base
);
112 base
= try (P_tmpdir
, base
);
115 /* Try /var/tmp, /usr/tmp, then /tmp. */
116 base
= try (vartmp
, base
);
117 base
= try (usrtmp
, base
);
118 base
= try (tmp
, base
);
120 /* If all else fails, use the current directory! */
124 /* Append DIR_SEPARATOR to the directory we've chosen
127 tmpdir
= xmalloc (len
+ 2);
128 strcpy (tmpdir
, base
);
129 tmpdir
[len
] = DIR_SEPARATOR
;
130 tmpdir
[len
+1] = '\0';
132 memoized_tmpdir
= tmpdir
;
138 @deftypefn Replacement char* make_temp_file (const char *@var{suffix})
140 Return a temporary file name (as a string) or @code{NULL} if unable to
141 create one. @var{suffix} is a suffix to append to the file name. The
142 string is @code{malloc}ed, and the temporary file has been created.
149 make_temp_file (suffix
)
152 const char *base
= choose_tmpdir ();
154 int base_len
, suffix_len
;
160 base_len
= strlen (base
);
161 suffix_len
= strlen (suffix
);
163 temp_filename
= xmalloc (base_len
166 strcpy (temp_filename
, base
);
167 strcpy (temp_filename
+ base_len
, TEMP_FILE
);
168 strcpy (temp_filename
+ base_len
+ TEMP_FILE_LEN
, suffix
);
170 fd
= mkstemps (temp_filename
, suffix_len
);
171 /* If mkstemps failed, then something bad is happening. Maybe we should
172 issue a message about a possible security attack in progress? */
175 /* Similarly if we can not close the file. */
178 return temp_filename
;
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