Daily bump.
[official-gcc.git] / libiberty / make-temp-file.c
blob5e21414ad8eed1f8294879235c2775f13956a647
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., 51 Franklin Street - Fifth Floor,
18 Boston, MA 02110-1301, USA. */
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
24 #include <stdio.h> /* May get P_tmpdir. */
25 #include <sys/types.h>
26 #ifdef HAVE_UNISTD_H
27 #include <unistd.h>
28 #endif
29 #ifdef HAVE_STDLIB_H
30 #include <stdlib.h>
31 #endif
32 #ifdef HAVE_STRING_H
33 #include <string.h>
34 #endif
35 #ifdef HAVE_SYS_FILE_H
36 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
37 #endif
39 #ifndef R_OK
40 #define R_OK 4
41 #define W_OK 2
42 #define X_OK 1
43 #endif
45 #include "libiberty.h"
46 extern int mkstemps (char *, int);
48 /* '/' works just fine on MS-DOS based systems. */
49 #ifndef DIR_SEPARATOR
50 #define DIR_SEPARATOR '/'
51 #endif
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_dir (const char *, const char *);
66 static inline const char *
67 try_dir (const char *dir, const char *base)
69 if (base != 0)
70 return base;
71 if (dir != 0
72 && access (dir, R_OK | W_OK | X_OK) == 0)
73 return dir;
74 return 0;
77 static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
78 static const char usrtmp[] =
79 { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
80 static const char vartmp[] =
81 { DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
83 static char *memoized_tmpdir;
87 @deftypefn Replacement char* choose_tmpdir ()
89 Returns a pointer to a directory path suitable for creating temporary
90 files in.
92 @end deftypefn
96 char *
97 choose_tmpdir (void)
99 const char *base = 0;
100 char *tmpdir;
101 unsigned int len;
103 if (memoized_tmpdir)
104 return memoized_tmpdir;
106 base = try_dir (getenv ("TMPDIR"), base);
107 base = try_dir (getenv ("TMP"), base);
108 base = try_dir (getenv ("TEMP"), base);
110 #ifdef P_tmpdir
111 base = try_dir (P_tmpdir, base);
112 #endif
114 /* Try /var/tmp, /usr/tmp, then /tmp. */
115 base = try_dir (vartmp, base);
116 base = try_dir (usrtmp, base);
117 base = try_dir (tmp, base);
119 /* If all else fails, use the current directory! */
120 if (base == 0)
121 base = ".";
123 /* Append DIR_SEPARATOR to the directory we've chosen
124 and return it. */
125 len = strlen (base);
126 tmpdir = XNEWVEC (char, len + 2);
127 strcpy (tmpdir, base);
128 tmpdir[len] = DIR_SEPARATOR;
129 tmpdir[len+1] = '\0';
131 memoized_tmpdir = tmpdir;
132 return tmpdir;
137 @deftypefn Replacement char* make_temp_file (const char *@var{suffix})
139 Return a temporary file name (as a string) or @code{NULL} if unable to
140 create one. @var{suffix} is a suffix to append to the file name. The
141 string is @code{malloc}ed, and the temporary file has been created.
143 @end deftypefn
147 char *
148 make_temp_file (const char *suffix)
150 const char *base = choose_tmpdir ();
151 char *temp_filename;
152 int base_len, suffix_len;
153 int fd;
155 if (suffix == 0)
156 suffix = "";
158 base_len = strlen (base);
159 suffix_len = strlen (suffix);
161 temp_filename = XNEWVEC (char, base_len
162 + TEMP_FILE_LEN
163 + suffix_len + 1);
164 strcpy (temp_filename, base);
165 strcpy (temp_filename + base_len, TEMP_FILE);
166 strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix);
168 fd = mkstemps (temp_filename, suffix_len);
169 /* If mkstemps failed, then something bad is happening. Maybe we should
170 issue a message about a possible security attack in progress? */
171 if (fd == -1)
172 abort ();
173 /* Similarly if we can not close the file. */
174 if (close (fd))
175 abort ();
176 return temp_filename;