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6599da04 | 1 | /* Utility to pick a temporary filename prefix. |
b9fb3c42 | 2 | Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. |
6599da04 JM |
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 | ||
16ba4214 | 20 | /* This file exports two functions: choose_temp_base and make_temp_file. */ |
6599da04 JM |
21 | |
22 | /* This file lives in at least two places: libiberty and gcc. | |
23 | Don't change one without the other. */ | |
24 | ||
11a0bb74 | 25 | #ifdef HAVE_CONFIG_H |
84f79fea JL |
26 | #include "config.h" |
27 | #endif | |
28 | ||
11a0bb74 | 29 | #include <stdio.h> /* May get P_tmpdir. */ |
6599da04 | 30 | #include <sys/types.h> |
11a0bb74 KG |
31 | #ifdef HAVE_UNISTD_H |
32 | #include <unistd.h> | |
33 | #endif | |
34 | #ifdef HAVE_SYS_FILE_H | |
6599da04 JM |
35 | #include <sys/file.h> /* May get R_OK, etc. on some systems. */ |
36 | #endif | |
37 | ||
38 | #ifndef R_OK | |
39 | #define R_OK 4 | |
40 | #define W_OK 2 | |
41 | #define X_OK 1 | |
42 | #endif | |
43 | ||
9b1a92d8 | 44 | #include "libiberty.h" |
91e0f659 | 45 | extern int mkstemps (); |
11a0bb74 KG |
46 | |
47 | #ifndef IN_GCC | |
6599da04 JM |
48 | #if defined (__MSDOS__) || defined (_WIN32) |
49 | #define DIR_SEPARATOR '\\' | |
50 | #endif | |
51 | #endif | |
52 | ||
53 | #ifndef DIR_SEPARATOR | |
54 | #define DIR_SEPARATOR '/' | |
55 | #endif | |
56 | ||
57 | /* On MSDOS, write temp files in current dir | |
58 | because there's no place else we can expect to use. */ | |
59 | /* ??? Although the current directory is tried as a last resort, | |
84f79fea | 60 | this is left in so that on MSDOS it is preferred to /tmp on the |
6599da04 JM |
61 | off chance that someone requires this, since that was the previous |
62 | behaviour. */ | |
63 | #ifdef __MSDOS__ | |
64 | #ifndef P_tmpdir | |
65 | #define P_tmpdir "." | |
66 | #endif | |
67 | #endif | |
68 | ||
69 | /* Name of temporary file. | |
70 | mktemp requires 6 trailing X's. */ | |
71 | #define TEMP_FILE "ccXXXXXX" | |
72 | ||
73 | /* Subroutine of choose_temp_base. | |
84f79fea | 74 | If BASE is non-NULL, return it. |
6599da04 JM |
75 | Otherwise it checks if DIR is a usable directory. |
76 | If success, DIR is returned. | |
77 | Otherwise NULL is returned. */ | |
78 | ||
79 | static char * | |
80 | try (dir, base) | |
81 | char *dir, *base; | |
82 | { | |
83 | if (base != 0) | |
84 | return base; | |
85 | if (dir != 0 | |
86 | && access (dir, R_OK | W_OK | X_OK) == 0) | |
87 | return dir; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* Return a prefix for temporary file names or NULL if unable to find one. | |
92 | The current directory is chosen if all else fails so the program is | |
93 | exited if a temporary directory can't be found (mktemp fails). | |
16ba4214 JL |
94 | The buffer for the result is obtained with xmalloc. |
95 | ||
96 | This function is provided for backwards compatability only. It use | |
97 | is not recommended. */ | |
6599da04 JM |
98 | |
99 | char * | |
100 | choose_temp_base () | |
101 | { | |
102 | char *base = 0; | |
103 | char *temp_filename; | |
104 | int len; | |
105 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
106 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
107 | ||
6599da04 JM |
108 | base = try (getenv ("TMPDIR"), base); |
109 | base = try (getenv ("TMP"), base); | |
110 | base = try (getenv ("TEMP"), base); | |
111 | ||
112 | #ifdef P_tmpdir | |
113 | base = try (P_tmpdir, base); | |
114 | #endif | |
115 | ||
116 | /* Try /usr/tmp, then /tmp. */ | |
117 | base = try (usrtmp, base); | |
118 | base = try (tmp, base); | |
119 | ||
120 | /* If all else fails, use the current directory! */ | |
121 | if (base == 0) | |
6599da04 | 122 | base = "."; |
6599da04 | 123 | |
6599da04 JM |
124 | len = strlen (base); |
125 | temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/ | |
126 | + strlen (TEMP_FILE) + 1); | |
127 | strcpy (temp_filename, base); | |
128 | ||
6599da04 JM |
129 | if (len != 0 |
130 | && temp_filename[len-1] != '/' | |
131 | && temp_filename[len-1] != DIR_SEPARATOR) | |
132 | temp_filename[len++] = DIR_SEPARATOR; | |
6599da04 JM |
133 | strcpy (temp_filename + len, TEMP_FILE); |
134 | ||
135 | mktemp (temp_filename); | |
136 | if (strlen (temp_filename) == 0) | |
137 | abort (); | |
138 | return temp_filename; | |
139 | } | |
16ba4214 JL |
140 | /* Return a temporary file name (as a string) or NULL if unable to create |
141 | one. */ | |
142 | ||
143 | char * | |
144 | make_temp_file (suffix) | |
145 | char *suffix; | |
146 | { | |
147 | char *base = 0; | |
148 | char *temp_filename; | |
149 | int base_len, suffix_len; | |
150 | int fd; | |
151 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
152 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
153 | ||
154 | base = try (getenv ("TMPDIR"), base); | |
155 | base = try (getenv ("TMP"), base); | |
156 | base = try (getenv ("TEMP"), base); | |
157 | ||
158 | #ifdef P_tmpdir | |
159 | base = try (P_tmpdir, base); | |
160 | #endif | |
161 | ||
162 | /* Try /usr/tmp, then /tmp. */ | |
163 | base = try (usrtmp, base); | |
164 | base = try (tmp, base); | |
165 | ||
166 | /* If all else fails, use the current directory! */ | |
167 | if (base == 0) | |
168 | base = "."; | |
169 | ||
170 | base_len = strlen (base); | |
171 | ||
172 | if (suffix) | |
173 | suffix_len = strlen (suffix); | |
174 | else | |
175 | suffix_len = 0; | |
176 | ||
177 | temp_filename = xmalloc (base_len + 1 /*DIR_SEPARATOR*/ | |
178 | + strlen (TEMP_FILE) | |
179 | + suffix_len + 1); | |
180 | strcpy (temp_filename, base); | |
181 | ||
182 | if (base_len != 0 | |
183 | && temp_filename[base_len-1] != '/' | |
184 | && temp_filename[base_len-1] != DIR_SEPARATOR) | |
185 | temp_filename[base_len++] = DIR_SEPARATOR; | |
186 | strcpy (temp_filename + base_len, TEMP_FILE); | |
187 | ||
188 | if (suffix) | |
189 | strcat (temp_filename, suffix); | |
190 | ||
191 | fd = mkstemps (temp_filename, suffix_len); | |
192 | /* If mkstemps failed, then something bad is happening. Maybe we should | |
193 | issue a message about a possible security attack in progress? */ | |
194 | if (fd == -1) | |
195 | abort (); | |
196 | /* Similarly if we can not close the file. */ | |
197 | if (close (fd)) | |
198 | abort (); | |
199 | return temp_filename; | |
200 | } |