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402e1fd1 | 1 | /* Utility to pick a temporary filename prefix. |
ed24b9f2 DE |
2 | Copyright (C) 1996 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 | |
a7095f97 DE |
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, | |
ed24b9f2 DE |
18 | Boston, MA 02111-1307, USA. */ |
19 | ||
402e1fd1 | 20 | /* This file exports one function: choose_temp_base. */ |
ed24b9f2 | 21 | |
18496203 DE |
22 | /* This file lives in at least two places: libiberty and gcc. |
23 | Don't change one without the other. */ | |
24 | ||
9e189a7a | 25 | #ifndef NO_SYS_FILE_H |
a7095f97 | 26 | #include <sys/types.h> |
ed24b9f2 DE |
27 | #include <sys/file.h> /* May get R_OK, etc. on some systems. */ |
28 | #endif | |
29 | ||
30 | #ifndef R_OK | |
31 | #define R_OK 4 | |
32 | #define W_OK 2 | |
33 | #define X_OK 1 | |
34 | #endif | |
35 | ||
0980566f DE |
36 | #include <stdio.h> /* May get P_tmpdir. */ |
37 | ||
ed24b9f2 DE |
38 | #ifdef IN_GCC |
39 | #include "config.h" | |
40 | #include "gansidecl.h" | |
41 | extern char *xmalloc (); | |
42 | #else | |
43 | #include "ansidecl.h" | |
44 | #include "libiberty.h" | |
45 | #if defined (__MSDOS__) || defined (_WIN32) | |
46 | #define DIR_SEPARATOR '\\' | |
47 | #endif | |
48 | #endif | |
49 | ||
50 | #ifndef DIR_SEPARATOR | |
51 | #define DIR_SEPARATOR '/' | |
52 | #endif | |
53 | ||
54 | /* On MSDOS, write temp files in current dir | |
55 | because there's no place else we can expect to use. */ | |
56 | /* ??? Although the current directory is tried as a last resort, | |
57 | this is left in so that on MSDOS it is prefered to /tmp on the | |
58 | off chance that someone requires this, since that was the previous | |
59 | behaviour. */ | |
60 | #ifdef __MSDOS__ | |
61 | #ifndef P_tmpdir | |
62 | #define P_tmpdir "." | |
63 | #endif | |
64 | #endif | |
65 | ||
66 | /* Name of temporary file. | |
67 | mktemp requires 6 trailing X's. */ | |
68 | #define TEMP_FILE "ccXXXXXX" | |
69 | ||
70 | /* Subroutine of choose_temp_base. | |
71 | If BASE is non-NULL, returh it. | |
72 | Otherwise it checks if DIR is a usable directory. | |
73 | If success, DIR is returned. | |
74 | Otherwise NULL is returned. */ | |
75 | ||
76 | static char * | |
77 | try (dir, base) | |
78 | char *dir, *base; | |
79 | { | |
80 | if (base != 0) | |
81 | return base; | |
82 | if (dir != 0 | |
83 | && access (dir, R_OK | W_OK) == 0) | |
84 | return dir; | |
85 | return 0; | |
86 | } | |
87 | ||
88 | /* Return a prefix for temporary file names or NULL if unable to find one. | |
89 | The current directory is chosen if all else fails so the program is | |
90 | exited if a temporary directory can't be found (mktemp fails). | |
91 | The buffer for the result is obtained with xmalloc. */ | |
92 | ||
93 | char * | |
402e1fd1 | 94 | choose_temp_base () |
ed24b9f2 DE |
95 | { |
96 | char *base = 0; | |
97 | char *temp_filename; | |
98 | int len; | |
6524f653 DE |
99 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; |
100 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
ed24b9f2 DE |
101 | |
102 | #ifndef MPW | |
103 | base = try (getenv ("TMPDIR"), base); | |
104 | base = try (getenv ("TMP"), base); | |
105 | base = try (getenv ("TEMP"), base); | |
106 | ||
107 | #ifdef P_tmpdir | |
108 | base = try (P_tmpdir, base); | |
109 | #endif | |
110 | ||
111 | /* Try /usr/tmp, then /tmp. */ | |
ed24b9f2 | 112 | base = try (usrtmp, base); |
ed24b9f2 DE |
113 | base = try (tmp, base); |
114 | ||
115 | /* If all else fails, use the current directory! */ | |
116 | if (base == 0) | |
117 | base = "."; | |
118 | ||
119 | #else /* MPW */ | |
120 | base = ":"; | |
121 | #endif | |
122 | ||
123 | len = strlen (base); | |
124 | if (len == 0) | |
125 | abort (); | |
126 | temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/ | |
127 | + strlen (TEMP_FILE) + 1); | |
128 | strcpy (temp_filename, base); | |
129 | ||
130 | #ifndef MPW | |
131 | if (temp_filename[len-1] != '/' | |
132 | && temp_filename[len-1] != DIR_SEPARATOR) | |
133 | temp_filename[len++] = DIR_SEPARATOR; | |
134 | #else /* MPW */ | |
135 | if (temp_filename[len-1] != ':') | |
136 | temp_filename[len++] = ':'; | |
137 | #endif /* MPW */ | |
138 | strcpy (temp_filename + len, TEMP_FILE); | |
139 | ||
140 | mktemp (temp_filename); | |
141 | if (strlen (temp_filename) == 0) | |
142 | abort (); | |
143 | return temp_filename; | |
144 | } |