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6599da04 | 1 | /* Utility to pick a temporary filename prefix. |
84f79fea | 2 | Copyright (C) 1996, 1997 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 | ||
20 | /* This file exports one function: choose_temp_base. */ | |
21 | ||
22 | /* This file lives in at least two places: libiberty and gcc. | |
23 | Don't change one without the other. */ | |
24 | ||
84f79fea JL |
25 | #ifdef IN_GCC |
26 | #include "config.h" | |
27 | #endif | |
28 | ||
29 | #ifdef HAVE_SYS_FILE_H | |
6599da04 JM |
30 | #include <sys/types.h> |
31 | #include <sys/file.h> /* May get R_OK, etc. on some systems. */ | |
32 | #endif | |
33 | ||
34 | #ifndef R_OK | |
35 | #define R_OK 4 | |
36 | #define W_OK 2 | |
37 | #define X_OK 1 | |
38 | #endif | |
39 | ||
40 | #include <stdio.h> /* May get P_tmpdir. */ | |
41 | ||
42 | #ifdef IN_GCC | |
6599da04 JM |
43 | #include "gansidecl.h" |
44 | extern char *xmalloc (); | |
45 | #else | |
46 | #include "ansidecl.h" | |
47 | #include "libiberty.h" | |
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). | |
94 | The buffer for the result is obtained with xmalloc. */ | |
95 | ||
96 | char * | |
97 | choose_temp_base () | |
98 | { | |
99 | char *base = 0; | |
100 | char *temp_filename; | |
101 | int len; | |
102 | static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
103 | static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
104 | ||
105 | #ifndef MPW | |
106 | base = try (getenv ("TMPDIR"), base); | |
107 | base = try (getenv ("TMP"), base); | |
108 | base = try (getenv ("TEMP"), base); | |
109 | ||
110 | #ifdef P_tmpdir | |
111 | base = try (P_tmpdir, base); | |
112 | #endif | |
113 | ||
114 | /* Try /usr/tmp, then /tmp. */ | |
115 | base = try (usrtmp, base); | |
116 | base = try (tmp, base); | |
117 | ||
118 | /* If all else fails, use the current directory! */ | |
119 | if (base == 0) | |
6599da04 | 120 | base = "."; |
6599da04 JM |
121 | |
122 | #else /* MPW */ | |
123 | base = ":"; | |
124 | #endif | |
125 | ||
126 | len = strlen (base); | |
127 | temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/ | |
128 | + strlen (TEMP_FILE) + 1); | |
129 | strcpy (temp_filename, base); | |
130 | ||
131 | #ifndef MPW | |
132 | if (len != 0 | |
133 | && temp_filename[len-1] != '/' | |
134 | && temp_filename[len-1] != DIR_SEPARATOR) | |
135 | temp_filename[len++] = DIR_SEPARATOR; | |
136 | #else /* MPW */ | |
137 | if (temp_filename[len-1] != ':') | |
138 | temp_filename[len++] = ':'; | |
139 | #endif /* MPW */ | |
140 | strcpy (temp_filename + len, TEMP_FILE); | |
141 | ||
142 | mktemp (temp_filename); | |
143 | if (strlen (temp_filename) == 0) | |
144 | abort (); | |
145 | return temp_filename; | |
146 | } |