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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, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
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" | |
46 | extern int mkstemps PARAMS ((char *, int)); | |
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 | ||
d9697354 | 64 | static inline const char *try PARAMS ((const char *, const char *)); |
1dffcc66 | 65 | |
d9697354 | 66 | static inline const char * |
1dffcc66 DD |
67 | try (dir, base) |
68 | const char *dir, *base; | |
69 | { | |
70 | if (base != 0) | |
71 | return base; | |
72 | if (dir != 0 | |
73 | && access (dir, R_OK | W_OK | X_OK) == 0) | |
74 | return dir; | |
75 | return 0; | |
76 | } | |
77 | ||
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 }; | |
83 | ||
84 | static char *memoized_tmpdir; | |
85 | ||
86 | char * | |
87 | choose_tmpdir () | |
88 | { | |
89 | const char *base = 0; | |
90 | char *tmpdir; | |
91 | unsigned int len; | |
92 | ||
93 | if (memoized_tmpdir) | |
94 | return memoized_tmpdir; | |
95 | ||
96 | base = try (getenv ("TMPDIR"), base); | |
97 | base = try (getenv ("TMP"), base); | |
98 | base = try (getenv ("TEMP"), base); | |
99 | ||
100 | #ifdef P_tmpdir | |
101 | base = try (P_tmpdir, base); | |
102 | #endif | |
103 | ||
104 | /* Try /var/tmp, /usr/tmp, then /tmp. */ | |
105 | base = try (vartmp, base); | |
106 | base = try (usrtmp, base); | |
107 | base = try (tmp, base); | |
108 | ||
109 | /* If all else fails, use the current directory! */ | |
110 | if (base == 0) | |
111 | base = "."; | |
112 | ||
113 | /* Append DIR_SEPARATOR to the directory we've chosen | |
114 | and return it. */ | |
115 | len = strlen (base); | |
116 | tmpdir = xmalloc (len + 2); | |
117 | strcpy (tmpdir, base); | |
118 | tmpdir[len] = DIR_SEPARATOR; | |
119 | tmpdir[len+1] = '\0'; | |
120 | ||
121 | memoized_tmpdir = tmpdir; | |
122 | return tmpdir; | |
123 | } | |
124 | ||
125 | /* Return a temporary file name (as a string) or NULL if unable to create | |
126 | one. SUFFIX is a suffix to append to the file name. The string is | |
127 | malloced, and the temporary file has been created. */ | |
128 | ||
129 | char * | |
130 | make_temp_file (suffix) | |
131 | const char *suffix; | |
132 | { | |
133 | const char *base = choose_tmpdir (); | |
134 | char *temp_filename; | |
135 | int base_len, suffix_len; | |
136 | int fd; | |
137 | ||
138 | if (suffix == 0) | |
139 | suffix = ""; | |
140 | ||
141 | base_len = strlen (base); | |
142 | suffix_len = strlen (suffix); | |
143 | ||
144 | temp_filename = xmalloc (base_len | |
145 | + TEMP_FILE_LEN | |
146 | + suffix_len + 1); | |
147 | strcpy (temp_filename, base); | |
148 | strcpy (temp_filename + base_len, TEMP_FILE); | |
149 | strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix); | |
150 | ||
151 | fd = mkstemps (temp_filename, suffix_len); | |
152 | /* If mkstemps failed, then something bad is happening. Maybe we should | |
153 | issue a message about a possible security attack in progress? */ | |
154 | if (fd == -1) | |
155 | abort (); | |
156 | /* Similarly if we can not close the file. */ | |
157 | if (close (fd)) | |
158 | abort (); | |
159 | return temp_filename; | |
160 | } |