Mercurial > hg > CbC > CbC_gcc

comparison libiberty/make-temp-file.c @ 0:a06113de4d67

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
first commit
author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
parents
children 77e2b8dfacca
comparison
equal deleted inserted replaced
-1:000000000000 0:a06113de4d67
1 /* Utility to pick a temporary filename prefix.
2 Copyright (C) 1996, 1997, 1998, 2001 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., 51 Franklin Street - Fifth Floor,
18 Boston, MA 02110-1301, USA. */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include <stdio.h> /* May get P_tmpdir. */
25 #include <sys/types.h>
26 #include <errno.h>
27 #ifdef HAVE_UNISTD_H
28 #include <unistd.h>
29 #endif
30 #ifdef HAVE_STDLIB_H
31 #include <stdlib.h>
32 #endif
33 #ifdef HAVE_STRING_H
34 #include <string.h>
35 #endif
36 #ifdef HAVE_SYS_FILE_H
37 #include <sys/file.h> /* May get R_OK, etc. on some systems. */
38 #endif
39 #if defined(_WIN32) && !defined(__CYGWIN__)
40 #include <windows.h>
41 #endif
42
43 #ifndef R_OK
44 #define R_OK 4
45 #define W_OK 2
46 #define X_OK 1
47 #endif
48
49 #include "libiberty.h"
50 extern int mkstemps (char *, int);
51
52 /* '/' works just fine on MS-DOS based systems. */
53 #ifndef DIR_SEPARATOR
54 #define DIR_SEPARATOR '/'
55 #endif
56
57 /* Name of temporary file.
58 mktemp requires 6 trailing X's. */
59 #define TEMP_FILE "ccXXXXXX"
60 #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1)
61
62 #if !defined(_WIN32) || defined(__CYGWIN__)
63
64 /* Subroutine of choose_tmpdir.
65 If BASE is non-NULL, return it.
66 Otherwise it checks if DIR is a usable directory.
67 If success, DIR is returned.
68 Otherwise NULL is returned. */
69
70 static inline const char *try_dir (const char *, const char *);
71
72 static inline const char *
73 try_dir (const char *dir, const char *base)
74 {
75 if (base != 0)
76 return base;
77 if (dir != 0
78 && access (dir, R_OK | W_OK | X_OK) == 0)
79 return dir;
80 return 0;
81 }
82
83 static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 };
84 static const char usrtmp[] =
85 { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
86 static const char vartmp[] =
87 { DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 };
88
89 #endif
90
91 static char *memoized_tmpdir;
92
93 /*
94
95 @deftypefn Replacement char* choose_tmpdir ()
96
97 Returns a pointer to a directory path suitable for creating temporary
98 files in.
99
100 @end deftypefn
101
102 */
103
104 char *
105 choose_tmpdir (void)
106 {
107 if (!memoized_tmpdir)
108 {
109 #if !defined(_WIN32) || defined(__CYGWIN__)
110 const char *base = 0;
111 char *tmpdir;
112 unsigned int len;
113
114 base = try_dir (getenv ("TMPDIR"), base);
115 base = try_dir (getenv ("TMP"), base);
116 base = try_dir (getenv ("TEMP"), base);
117
118 #ifdef P_tmpdir
119 base = try_dir (P_tmpdir, base);
120 #endif
121
122 /* Try /var/tmp, /usr/tmp, then /tmp. */
123 base = try_dir (vartmp, base);
124 base = try_dir (usrtmp, base);
125 base = try_dir (tmp, base);
126
127 /* If all else fails, use the current directory! */
128 if (base == 0)
129 base = ".";
130 /* Append DIR_SEPARATOR to the directory we've chosen
131 and return it. */
132 len = strlen (base);
133 tmpdir = XNEWVEC (char, len + 2);
134 strcpy (tmpdir, base);
135 tmpdir[len] = DIR_SEPARATOR;
136 tmpdir[len+1] = '\0';
137 memoized_tmpdir = tmpdir;
138 #else /* defined(_WIN32) && !defined(__CYGWIN__) */
139 DWORD len;
140
141 /* Figure out how much space we need. */
142 len = GetTempPath(0, NULL);
143 if (len)
144 {
145 memoized_tmpdir = XNEWVEC (char, len);
146 if (!GetTempPath(len, memoized_tmpdir))
147 {
148 XDELETEVEC (memoized_tmpdir);
149 memoized_tmpdir = NULL;
150 }
151 }
152 if (!memoized_tmpdir)
153 /* If all else fails, use the current directory. */
154 memoized_tmpdir = xstrdup (".\\");
155 #endif /* defined(_WIN32) && !defined(__CYGWIN__) */
156 }
157
158 return memoized_tmpdir;
159 }
160
161 /*
162
163 @deftypefn Replacement char* make_temp_file (const char *@var{suffix})
164
165 Return a temporary file name (as a string) or @code{NULL} if unable to
166 create one. @var{suffix} is a suffix to append to the file name. The
167 string is @code{malloc}ed, and the temporary file has been created.
168
169 @end deftypefn
170
171 */
172
173 char *
174 make_temp_file (const char *suffix)
175 {
176 const char *base = choose_tmpdir ();
177 char *temp_filename;
178 int base_len, suffix_len;
179 int fd;
180
181 if (suffix == 0)
182 suffix = "";
183
184 base_len = strlen (base);
185 suffix_len = strlen (suffix);
186
187 temp_filename = XNEWVEC (char, base_len
188 + TEMP_FILE_LEN
189 + suffix_len + 1);
190 strcpy (temp_filename, base);
191 strcpy (temp_filename + base_len, TEMP_FILE);
192 strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix);
193
194 fd = mkstemps (temp_filename, suffix_len);
195 /* Mkstemps failed. It may be EPERM, ENOSPC etc. */
196 if (fd == -1)
197 {
198 fprintf (stderr, "Cannot create temporary file in %s: %s\n",
199 base, strerror (errno));
200 abort ();
201 }
202 /* We abort on failed close out of sheer paranoia. */
203 if (close (fd))
204 abort ();
205 return temp_filename;
206 }