1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/file_util.h"
#include <fcntl.h>
#include <string>
#include <vector>
#include "base/eintr_wrapper.h"
#include "base/file_path.h"
#include "base/string_util.h"
// just lifted off bionic, no should find out why it doesn't get linked in
static int _gettemp(char *, int *, int, int);
extern uint32_t arc4random();
int
mkstemps(char *path, int slen)
{
int fd;
return (_gettemp(path, &fd, 0, slen) ? fd : -1);
}
int
mkstemp(char *path)
{
int fd;
return (_gettemp(path, &fd, 0, 0) ? fd : -1);
}
char *
mkdtemp(char *path)
{
return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
}
char *_mktemp(char *);
char *
_mktemp(char *path)
{
return(_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);
}
#ifdef __BIONIC__
__warn_references(mktemp,
"warning: mktemp() possibly used unsafely; consider using mkstemp()");
#endif
char *
mktemp(char *path)
{
return(_mktemp(path));
}
static int
_gettemp(char *path, int *doopen, int domkdir, int slen)
{
char *start, *trv, *suffp;
struct stat sbuf;
int rval;
pid_t pid;
if (doopen && domkdir) {
errno = EINVAL;
return(0);
}
for (trv = path; *trv; ++trv)
;
trv -= slen;
suffp = trv;
--trv;
if (trv < path) {
errno = EINVAL;
return (0);
}
pid = getpid();
while (trv >= path && *trv == 'X' && pid != 0) {
*trv-- = (pid % 10) + '0';
pid /= 10;
}
while (trv >= path && *trv == 'X') {
char c;
pid = (arc4random() & 0xffff) % (26+26);
if (pid < 26)
c = pid + 'A';
else
c = (pid - 26) + 'a';
*trv-- = c;
}
start = trv + 1;
/*
* check the target directory; if you have six X's and it
* doesn't exist this runs for a *very* long time.
*/
if (doopen || domkdir) {
for (;; --trv) {
if (trv <= path)
break;
if (*trv == '/') {
*trv = '\0';
rval = stat(path, &sbuf);
*trv = '/';
if (rval != 0)
return(0);
if (!S_ISDIR(sbuf.st_mode)) {
errno = ENOTDIR;
return(0);
}
break;
}
}
}
for (;;) {
if (doopen) {
if ((*doopen =
open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
return(1);
if (errno != EEXIST)
return(0);
} else if (domkdir) {
if (mkdir(path, 0700) == 0)
return(1);
if (errno != EEXIST)
return(0);
} else if (lstat(path, &sbuf))
return(errno == ENOENT ? 1 : 0);
/* tricky little algorithm for backward compatibility */
for (trv = start;;) {
if (!*trv)
return (0);
if (*trv == 'Z') {
if (trv == suffp)
return (0);
*trv++ = 'a';
} else {
if (isdigit(*trv))
*trv = 'a';
else if (*trv == 'z') /* inc from z to A */
*trv = 'A';
else {
if (trv == suffp)
return (0);
++*trv;
}
break;
}
}
}
/*NOTREACHED*/
}
|
