Commit | Line | Data |
---|---|---|
1dffcc66 DD |
1 | /* Utility to pick a temporary filename prefix. |
2 | Copyright (C) 1996, 1997, 1998, 2001 Free Software Foundation, Inc. | |
3 | ||
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. | |
9 | ||
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. | |
14 | ||
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, | |
979c05d3 NC |
17 | write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
18 | Boston, MA 02110-1301, USA. */ | |
1dffcc66 DD |
19 | |
20 | #ifdef HAVE_CONFIG_H | |
21 | #include "config.h" | |
22 | #endif | |
23 | ||
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 | |
38 | ||
39 | #ifndef R_OK | |
40 | #define R_OK 4 | |
41 | #define W_OK 2 | |
42 | #define X_OK 1 | |
43 | #endif | |
44 | ||
45 | #include "libiberty.h" | |
49b1fae4 | 46 | extern int mkstemps (char *, int); |
1dffcc66 DD |
47 | |
48 | /* '/' works just fine on MS-DOS based systems. */ | |
49 | #ifndef DIR_SEPARATOR | |
50 | #define DIR_SEPARATOR '/' | |
51 | #endif | |
52 | ||
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) | |
57 | ||
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. */ | |
63 | ||
abf6a75b | 64 | static inline const char *try_dir (const char *, const char *); |
1dffcc66 | 65 | |
d9697354 | 66 | static inline const char * |
abf6a75b | 67 | try_dir (const char *dir, const char *base) |
1dffcc66 DD |
68 | { |
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; | |
75 | } | |
76 | ||
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 }; | |
82 | ||
83 | static char *memoized_tmpdir; | |
84 | ||
ba19b94f DD |
85 | /* |
86 | ||
87 | @deftypefn Replacement char* choose_tmpdir () | |
88 | ||
89 | Returns a pointer to a directory path suitable for creating temporary | |
90 | files in. | |
91 | ||
92 | @end deftypefn | |
93 | ||
94 | */ | |
95 | ||
1dffcc66 | 96 | char * |
49b1fae4 | 97 | choose_tmpdir (void) |
1dffcc66 DD |
98 | { |
99 | const char *base = 0; | |
100 | char *tmpdir; | |
101 | unsigned int len; | |
102 | ||
103 | if (memoized_tmpdir) | |
104 | return memoized_tmpdir; | |
105 | ||
abf6a75b DD |
106 | base = try_dir (getenv ("TMPDIR"), base); |
107 | base = try_dir (getenv ("TMP"), base); | |
108 | base = try_dir (getenv ("TEMP"), base); | |
1dffcc66 DD |
109 | |
110 | #ifdef P_tmpdir | |
abf6a75b | 111 | base = try_dir (P_tmpdir, base); |
1dffcc66 DD |
112 | #endif |
113 | ||
114 | /* Try /var/tmp, /usr/tmp, then /tmp. */ | |
abf6a75b DD |
115 | base = try_dir (vartmp, base); |
116 | base = try_dir (usrtmp, base); | |
117 | base = try_dir (tmp, base); | |
1dffcc66 DD |
118 | |
119 | /* If all else fails, use the current directory! */ | |
120 | if (base == 0) | |
121 | base = "."; | |
122 | ||
123 | /* Append DIR_SEPARATOR to the directory we've chosen | |
124 | and return it. */ | |
125 | len = strlen (base); | |
abf6a75b | 126 | tmpdir = XNEWVEC (char, len + 2); |
1dffcc66 DD |
127 | strcpy (tmpdir, base); |
128 | tmpdir[len] = DIR_SEPARATOR; | |
129 | tmpdir[len+1] = '\0'; | |
130 | ||
131 | memoized_tmpdir = tmpdir; | |
132 | return tmpdir; | |
133 | } | |
134 | ||
ba19b94f DD |
135 | /* |
136 | ||
137 | @deftypefn Replacement char* make_temp_file (const char *@var{suffix}) | |
138 | ||
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 | |
5d852400 | 141 | string is @code{malloc}ed, and the temporary file has been created. |
ba19b94f DD |
142 | |
143 | @end deftypefn | |
144 | ||
145 | */ | |
1dffcc66 DD |
146 | |
147 | char * | |
49b1fae4 | 148 | make_temp_file (const char *suffix) |
1dffcc66 DD |
149 | { |
150 | const char *base = choose_tmpdir (); | |
151 | char *temp_filename; | |
152 | int base_len, suffix_len; | |
153 | int fd; | |
154 | ||
155 | if (suffix == 0) | |
156 | suffix = ""; | |
157 | ||
158 | base_len = strlen (base); | |
159 | suffix_len = strlen (suffix); | |
160 | ||
abf6a75b | 161 | temp_filename = XNEWVEC (char, base_len |
1dffcc66 DD |
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); | |
167 | ||
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; | |
177 | } |