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252b5132 RH |
1 | /* Utility to pick a temporary filename prefix. |
2 | Copyright (C) 1996, 1997, 1998 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 | /* This file exports two functions: choose_temp_base and make_temp_file. */ | |
21 | ||
252b5132 RH |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
25 | ||
26 | #include <stdio.h> /* May get P_tmpdir. */ | |
27 | #include <sys/types.h> | |
28 | #ifdef HAVE_UNISTD_H | |
29 | #include <unistd.h> | |
30 | #endif | |
31 | #ifdef HAVE_STDLIB_H | |
32 | #include <stdlib.h> | |
33 | #endif | |
35ca97ea RH |
34 | #ifdef HAVE_STRING_H |
35 | #include <string.h> | |
36 | #endif | |
252b5132 RH |
37 | #ifdef HAVE_SYS_FILE_H |
38 | #include <sys/file.h> /* May get R_OK, etc. on some systems. */ | |
39 | #endif | |
40 | ||
41 | #ifndef R_OK | |
42 | #define R_OK 4 | |
43 | #define W_OK 2 | |
44 | #define X_OK 1 | |
45 | #endif | |
46 | ||
47 | #include "libiberty.h" | |
48 | extern int mkstemps (); | |
49 | ||
50 | #ifndef IN_GCC | |
0c0a36a4 | 51 | #if defined (__MSDOS__) || (defined (_WIN32) && ! defined (__CYGWIN__) && ! defined (_UWIN)) |
252b5132 RH |
52 | #define DIR_SEPARATOR '\\' |
53 | #endif | |
54 | #endif | |
55 | ||
56 | #ifndef DIR_SEPARATOR | |
57 | #define DIR_SEPARATOR '/' | |
58 | #endif | |
59 | ||
60 | /* On MSDOS, write temp files in current dir | |
61 | because there's no place else we can expect to use. */ | |
62 | /* ??? Although the current directory is tried as a last resort, | |
63 | this is left in so that on MSDOS it is preferred to /tmp on the | |
64 | off chance that someone requires this, since that was the previous | |
65 | behaviour. */ | |
66 | #ifdef __MSDOS__ | |
67 | #ifndef P_tmpdir | |
68 | #define P_tmpdir "." | |
69 | #endif | |
70 | #endif | |
71 | ||
72 | /* Name of temporary file. | |
73 | mktemp requires 6 trailing X's. */ | |
74 | #define TEMP_FILE "ccXXXXXX" | |
75 | ||
76 | /* Subroutine of choose_temp_base. | |
77 | If BASE is non-NULL, return it. | |
78 | Otherwise it checks if DIR is a usable directory. | |
79 | If success, DIR is returned. | |
80 | Otherwise NULL is returned. */ | |
81 | ||
82 | static char * | |
83 | try (dir, base) | |
84 | char *dir, *base; | |
85 | { | |
86 | if (base != 0) | |
87 | return base; | |
88 | if (dir != 0 | |
89 | && access (dir, R_OK | W_OK | X_OK) == 0) | |
90 | return dir; | |
91 | return 0; | |
92 | } | |
93 | ||
94 | /* Return a prefix for temporary file names or NULL if unable to find one. | |
95 | The current directory is chosen if all else fails so the program is | |
96 | exited if a temporary directory can't be found (mktemp fails). | |
97 | The buffer for the result is obtained with xmalloc. | |
98 | ||
99 | This function is provided for backwards compatability only. It use | |
100 | is not recommended. */ | |
101 | ||
102 | char * | |
103 | choose_temp_base () | |
104 | { | |
105 | char *base = 0; | |
106 | char *temp_filename; | |
107 | int len; | |
108 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
109 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
110 | ||
111 | base = try (getenv ("TMPDIR"), base); | |
112 | base = try (getenv ("TMP"), base); | |
113 | base = try (getenv ("TEMP"), base); | |
114 | ||
115 | #ifdef P_tmpdir | |
116 | base = try (P_tmpdir, base); | |
117 | #endif | |
118 | ||
119 | /* Try /usr/tmp, then /tmp. */ | |
120 | base = try (usrtmp, base); | |
121 | base = try (tmp, base); | |
122 | ||
123 | /* If all else fails, use the current directory! */ | |
124 | if (base == 0) | |
125 | base = "."; | |
126 | ||
127 | len = strlen (base); | |
128 | temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/ | |
129 | + strlen (TEMP_FILE) + 1); | |
130 | strcpy (temp_filename, base); | |
131 | ||
132 | if (len != 0 | |
133 | && temp_filename[len-1] != '/' | |
134 | && temp_filename[len-1] != DIR_SEPARATOR) | |
135 | temp_filename[len++] = DIR_SEPARATOR; | |
136 | strcpy (temp_filename + len, TEMP_FILE); | |
137 | ||
138 | mktemp (temp_filename); | |
139 | if (strlen (temp_filename) == 0) | |
140 | abort (); | |
141 | return temp_filename; | |
142 | } | |
143 | /* Return a temporary file name (as a string) or NULL if unable to create | |
144 | one. */ | |
145 | ||
146 | char * | |
147 | make_temp_file (suffix) | |
0c0a36a4 | 148 | const char *suffix; |
252b5132 RH |
149 | { |
150 | char *base = 0; | |
151 | char *temp_filename; | |
152 | int base_len, suffix_len; | |
153 | int fd; | |
154 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
155 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
156 | ||
157 | base = try (getenv ("TMPDIR"), base); | |
158 | base = try (getenv ("TMP"), base); | |
159 | base = try (getenv ("TEMP"), base); | |
160 | ||
161 | #ifdef P_tmpdir | |
162 | base = try (P_tmpdir, base); | |
163 | #endif | |
164 | ||
165 | /* Try /usr/tmp, then /tmp. */ | |
166 | base = try (usrtmp, base); | |
167 | base = try (tmp, base); | |
168 | ||
169 | /* If all else fails, use the current directory! */ | |
170 | if (base == 0) | |
171 | base = "."; | |
172 | ||
173 | base_len = strlen (base); | |
174 | ||
175 | if (suffix) | |
176 | suffix_len = strlen (suffix); | |
177 | else | |
178 | suffix_len = 0; | |
179 | ||
180 | temp_filename = xmalloc (base_len + 1 /*DIR_SEPARATOR*/ | |
181 | + strlen (TEMP_FILE) | |
182 | + suffix_len + 1); | |
183 | strcpy (temp_filename, base); | |
184 | ||
185 | if (base_len != 0 | |
186 | && temp_filename[base_len-1] != '/' | |
187 | && temp_filename[base_len-1] != DIR_SEPARATOR) | |
188 | temp_filename[base_len++] = DIR_SEPARATOR; | |
189 | strcpy (temp_filename + base_len, TEMP_FILE); | |
190 | ||
191 | if (suffix) | |
192 | strcat (temp_filename, suffix); | |
193 | ||
194 | fd = mkstemps (temp_filename, suffix_len); | |
195 | /* If mkstemps failed, then something bad is happening. Maybe we should | |
196 | issue a message about a possible security attack in progress? */ | |
197 | if (fd == -1) | |
198 | abort (); | |
199 | /* Similarly if we can not close the file. */ | |
200 | if (close (fd)) | |
201 | abort (); | |
202 | return temp_filename; | |
203 | } |