ReactOS 0.4.15-dev-7674-gc0b4db1
mkstemps.c
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1/* Copyright (C) 1991, 1992, 1996, 1998 Free Software Foundation, Inc.
2 This file is derived from mkstemp.c from the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 Boston, MA 02110-1301, USA.
18*/
19
20#include <sys/types.h>
21#include <stdlib.h>
22#include <string.h>
23#include <errno.h>
24#include <stdio.h>
25#include <fcntl.h>
26
27#ifdef _WIN32
28 #include <io.h>
29 #include <process.h>
30#else
31 #include <unistd.h>
32 #include <sys/time.h>
33#endif
34
35/* We need to provide a type for gcc_uint64_t. */
36#ifdef __GNUC__
37__extension__ typedef unsigned long long gcc_uint64_t;
38#else
39typedef unsigned long gcc_uint64_t;
40#endif
41
42#ifndef TMP_MAX
43#define TMP_MAX 16384
44#endif
45
46/* if O_BINARY is not defined, the system is probably not expecting any such flag */
47#ifndef O_BINARY
48#define O_BINARY 0
49#endif
50
51/*
52
53@deftypefn Replacement int mkstemps (char *@var{template}, int @var{suffix_len})
54
55Generate a unique temporary file name from @var{template}.
56@var{template} has the form:
57
58@example
59 @var{path}/ccXXXXXX@var{suffix}
60@end example
61
62@var{suffix_len} tells us how long @var{suffix} is (it can be zero
63length). The last six characters of @var{template} before @var{suffix}
64must be @samp{XXXXXX}; they are replaced with a string that makes the
65filename unique. Returns a file descriptor open on the file for
66reading and writing.
67
68@end deftypefn
69
70*/
71
72int
74 char *template,
75 int suffix_len)
76{
77 static const char letters[]
78 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
79 static gcc_uint64_t value;
80#ifdef HAVE_GETTIMEOFDAY
81 struct timeval tv;
82#endif
83 char *XXXXXX;
84 size_t len;
85 int count;
86
87 len = strlen (template);
88
89 if ((int) len < 6 + suffix_len
90 || strncmp (&template[len - 6 - suffix_len], "XXXXXX", 6))
91 {
92 printf("wrong parameter\n");
93 return -1;
94 }
95
96 XXXXXX = &template[len - 6 - suffix_len];
97
98#ifdef HAVE_GETTIMEOFDAY
99 /* Get some more or less random data. */
100 gettimeofday (&tv, NULL);
101 value += ((gcc_uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
102#else
103 value += getpid ();
104#endif
105
106 for (count = 0; count < TMP_MAX; ++count)
107 {
109 int fd;
110
111 /* Fill in the random bits. */
112 XXXXXX[0] = letters[v % 62];
113 v /= 62;
114 XXXXXX[1] = letters[v % 62];
115 v /= 62;
116 XXXXXX[2] = letters[v % 62];
117 v /= 62;
118 XXXXXX[3] = letters[v % 62];
119 v /= 62;
120 XXXXXX[4] = letters[v % 62];
121 v /= 62;
122 XXXXXX[5] = letters[v % 62];
123
124#ifdef VMS
125 fd = open (template, O_RDWR|O_CREAT|O_EXCL, 0600, "fop=tmd");
126#else
127 fd = open (template, O_RDWR|O_CREAT|O_EXCL|O_BINARY, 0600);
128#endif
129 if (fd >= 0)
130 /* The file does not exist. */
131 return fd;
132
133 /* This is a random value. It is only necessary that the next
134 TMP_MAX values generated by adding 7777 to VALUE are different
135 with (module 2^32). */
136 value += 7777;
137 }
138
139 /* We return the null string if we can't find a unique file name. */
140 template[0] = '\0';
141 return -1;
142}
ACPI_SIZE strlen(const char *String)
Definition: utclib.c:269
int strncmp(const char *String1, const char *String2, ACPI_SIZE Count)
Definition: utclib.c:534
#define O_CREAT
Definition: acwin.h:110
#define open
Definition: acwin.h:95
#define gettimeofday(tv, tz)
Definition: adns_win32.h:159
#define NULL
Definition: types.h:112
#define printf
Definition: freeldr.h:94
const GLdouble * v
Definition: gl.h:2040
GLuint GLuint GLsizei count
Definition: gl.h:1545
GLenum GLsizei len
Definition: glext.h:6722
#define O_EXCL
Definition: fcntl.h:40
#define O_RDWR
Definition: fcntl.h:36
#define O_BINARY
Definition: mkstemps.c:48
int mkstemps(char *template, int suffix_len)
Definition: mkstemps.c:73
unsigned long gcc_uint64_t
Definition: mkstemps.c:39
#define TMP_MAX
Definition: mkstemps.c:43
static int fd
Definition: io.c:51
unsigned long tv_sec
Definition: linux.h:1738
unsigned long tv_usec
Definition: linux.h:1739
Definition: pdh_main.c:94
#define getpid
Definition: wintirpc.h:52