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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 | ||
22 | /* This file lives in at least two places: libiberty and gcc. | |
23 | Don't change one without the other. */ | |
24 | ||
25 | #ifdef HAVE_CONFIG_H | |
26 | #include "config.h" | |
27 | #endif | |
28 | ||
29 | #include <stdio.h> /* May get P_tmpdir. */ | |
30 | #include <sys/types.h> | |
31 | #ifdef HAVE_UNISTD_H | |
32 | #include <unistd.h> | |
33 | #endif | |
34 | #ifdef HAVE_STDLIB_H | |
35 | #include <stdlib.h> | |
36 | #endif | |
35ca97ea RH |
37 | #ifdef HAVE_STRING_H |
38 | #include <string.h> | |
39 | #endif | |
252b5132 RH |
40 | #ifdef HAVE_SYS_FILE_H |
41 | #include <sys/file.h> /* May get R_OK, etc. on some systems. */ | |
42 | #endif | |
43 | ||
44 | #ifndef R_OK | |
45 | #define R_OK 4 | |
46 | #define W_OK 2 | |
47 | #define X_OK 1 | |
48 | #endif | |
49 | ||
50 | #include "libiberty.h" | |
51 | extern int mkstemps (); | |
52 | ||
53 | #ifndef IN_GCC | |
54 | #if defined (__MSDOS__) || defined (_WIN32) | |
55 | #define DIR_SEPARATOR '\\' | |
56 | #endif | |
57 | #endif | |
58 | ||
59 | #ifndef DIR_SEPARATOR | |
60 | #define DIR_SEPARATOR '/' | |
61 | #endif | |
62 | ||
63 | /* On MSDOS, write temp files in current dir | |
64 | because there's no place else we can expect to use. */ | |
65 | /* ??? Although the current directory is tried as a last resort, | |
66 | this is left in so that on MSDOS it is preferred to /tmp on the | |
67 | off chance that someone requires this, since that was the previous | |
68 | behaviour. */ | |
69 | #ifdef __MSDOS__ | |
70 | #ifndef P_tmpdir | |
71 | #define P_tmpdir "." | |
72 | #endif | |
73 | #endif | |
74 | ||
75 | /* Name of temporary file. | |
76 | mktemp requires 6 trailing X's. */ | |
77 | #define TEMP_FILE "ccXXXXXX" | |
78 | ||
79 | /* Subroutine of choose_temp_base. | |
80 | If BASE is non-NULL, return it. | |
81 | Otherwise it checks if DIR is a usable directory. | |
82 | If success, DIR is returned. | |
83 | Otherwise NULL is returned. */ | |
84 | ||
85 | static char * | |
86 | try (dir, base) | |
87 | char *dir, *base; | |
88 | { | |
89 | if (base != 0) | |
90 | return base; | |
91 | if (dir != 0 | |
92 | && access (dir, R_OK | W_OK | X_OK) == 0) | |
93 | return dir; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* Return a prefix for temporary file names or NULL if unable to find one. | |
98 | The current directory is chosen if all else fails so the program is | |
99 | exited if a temporary directory can't be found (mktemp fails). | |
100 | The buffer for the result is obtained with xmalloc. | |
101 | ||
102 | This function is provided for backwards compatability only. It use | |
103 | is not recommended. */ | |
104 | ||
105 | char * | |
106 | choose_temp_base () | |
107 | { | |
108 | char *base = 0; | |
109 | char *temp_filename; | |
110 | int len; | |
111 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
112 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
113 | ||
114 | base = try (getenv ("TMPDIR"), base); | |
115 | base = try (getenv ("TMP"), base); | |
116 | base = try (getenv ("TEMP"), base); | |
117 | ||
118 | #ifdef P_tmpdir | |
119 | base = try (P_tmpdir, base); | |
120 | #endif | |
121 | ||
122 | /* Try /usr/tmp, then /tmp. */ | |
123 | base = try (usrtmp, base); | |
124 | base = try (tmp, base); | |
125 | ||
126 | /* If all else fails, use the current directory! */ | |
127 | if (base == 0) | |
128 | base = "."; | |
129 | ||
130 | len = strlen (base); | |
131 | temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/ | |
132 | + strlen (TEMP_FILE) + 1); | |
133 | strcpy (temp_filename, base); | |
134 | ||
135 | if (len != 0 | |
136 | && temp_filename[len-1] != '/' | |
137 | && temp_filename[len-1] != DIR_SEPARATOR) | |
138 | temp_filename[len++] = DIR_SEPARATOR; | |
139 | strcpy (temp_filename + len, TEMP_FILE); | |
140 | ||
141 | mktemp (temp_filename); | |
142 | if (strlen (temp_filename) == 0) | |
143 | abort (); | |
144 | return temp_filename; | |
145 | } | |
146 | /* Return a temporary file name (as a string) or NULL if unable to create | |
147 | one. */ | |
148 | ||
149 | char * | |
150 | make_temp_file (suffix) | |
151 | char *suffix; | |
152 | { | |
153 | char *base = 0; | |
154 | char *temp_filename; | |
155 | int base_len, suffix_len; | |
156 | int fd; | |
157 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
158 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
159 | ||
160 | base = try (getenv ("TMPDIR"), base); | |
161 | base = try (getenv ("TMP"), base); | |
162 | base = try (getenv ("TEMP"), base); | |
163 | ||
164 | #ifdef P_tmpdir | |
165 | base = try (P_tmpdir, base); | |
166 | #endif | |
167 | ||
168 | /* Try /usr/tmp, then /tmp. */ | |
169 | base = try (usrtmp, base); | |
170 | base = try (tmp, base); | |
171 | ||
172 | /* If all else fails, use the current directory! */ | |
173 | if (base == 0) | |
174 | base = "."; | |
175 | ||
176 | base_len = strlen (base); | |
177 | ||
178 | if (suffix) | |
179 | suffix_len = strlen (suffix); | |
180 | else | |
181 | suffix_len = 0; | |
182 | ||
183 | temp_filename = xmalloc (base_len + 1 /*DIR_SEPARATOR*/ | |
184 | + strlen (TEMP_FILE) | |
185 | + suffix_len + 1); | |
186 | strcpy (temp_filename, base); | |
187 | ||
188 | if (base_len != 0 | |
189 | && temp_filename[base_len-1] != '/' | |
190 | && temp_filename[base_len-1] != DIR_SEPARATOR) | |
191 | temp_filename[base_len++] = DIR_SEPARATOR; | |
192 | strcpy (temp_filename + base_len, TEMP_FILE); | |
193 | ||
194 | if (suffix) | |
195 | strcat (temp_filename, suffix); | |
196 | ||
197 | fd = mkstemps (temp_filename, suffix_len); | |
198 | /* If mkstemps failed, then something bad is happening. Maybe we should | |
199 | issue a message about a possible security attack in progress? */ | |
200 | if (fd == -1) | |
201 | abort (); | |
202 | /* Similarly if we can not close the file. */ | |
203 | if (close (fd)) | |
204 | abort (); | |
205 | return temp_filename; | |
206 | } |