0,0 → 1,147 |
/* Copyright (C) 1991, 1992, 1996, 1998, 2004 Free Software Foundation, Inc. |
This file is derived from mkstemp.c from the GNU C Library. |
|
The GNU C Library is free software; you can redistribute it and/or |
modify it under the terms of the GNU Library General Public License as |
published by the Free Software Foundation; either version 2 of the |
License, or (at your option) any later version. |
|
The GNU C Library is distributed in the hope that it will be useful, |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
Library General Public License for more details. |
|
You should have received a copy of the GNU Library General Public |
License along with the GNU C Library; see the file COPYING.LIB. If not, |
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
Boston, MA 02110-1301, USA. */ |
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#ifdef HAVE_CONFIG_H |
#include "config.h" |
#endif |
|
#include <sys/types.h> |
#ifdef HAVE_STDLIB_H |
#include <stdlib.h> |
#endif |
#ifdef HAVE_STRING_H |
#include <string.h> |
#endif |
#include <errno.h> |
#include <stdio.h> |
#include <fcntl.h> |
#ifdef HAVE_UNISTD_H |
#include <unistd.h> |
#endif |
#ifdef HAVE_SYS_TIME_H |
#include <sys/time.h> |
#endif |
#include "ansidecl.h" |
|
/* We need to provide a type for gcc_uint64_t. */ |
#ifdef __GNUC__ |
__extension__ typedef unsigned long long gcc_uint64_t; |
#else |
typedef unsigned long gcc_uint64_t; |
#endif |
|
#ifndef TMP_MAX |
#define TMP_MAX 16384 |
#endif |
|
#ifndef O_BINARY |
# define O_BINARY 0 |
#endif |
|
/* |
|
@deftypefn Replacement int mkstemps (char *@var{pattern}, int @var{suffix_len}) |
|
Generate a unique temporary file name from @var{pattern}. |
@var{pattern} has the form: |
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@example |
@var{path}/ccXXXXXX@var{suffix} |
@end example |
|
@var{suffix_len} tells us how long @var{suffix} is (it can be zero |
length). The last six characters of @var{pattern} before @var{suffix} |
must be @samp{XXXXXX}; they are replaced with a string that makes the |
filename unique. Returns a file descriptor open on the file for |
reading and writing. |
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@end deftypefn |
|
*/ |
|
int |
mkstemps (char *pattern, int suffix_len) |
{ |
static const char letters[] |
= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; |
static gcc_uint64_t value; |
#ifdef HAVE_GETTIMEOFDAY |
struct timeval tv; |
#endif |
char *XXXXXX; |
size_t len; |
int count; |
|
len = strlen (pattern); |
|
if ((int) len < 6 + suffix_len |
|| strncmp (&pattern[len - 6 - suffix_len], "XXXXXX", 6)) |
{ |
return -1; |
} |
|
XXXXXX = &pattern[len - 6 - suffix_len]; |
|
#ifdef HAVE_GETTIMEOFDAY |
/* Get some more or less random data. */ |
gettimeofday (&tv, NULL); |
value += ((gcc_uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid (); |
#else |
value += getpid (); |
#endif |
|
for (count = 0; count < TMP_MAX; ++count) |
{ |
gcc_uint64_t v = value; |
int fd; |
|
/* Fill in the random bits. */ |
XXXXXX[0] = letters[v % 62]; |
v /= 62; |
XXXXXX[1] = letters[v % 62]; |
v /= 62; |
XXXXXX[2] = letters[v % 62]; |
v /= 62; |
XXXXXX[3] = letters[v % 62]; |
v /= 62; |
XXXXXX[4] = letters[v % 62]; |
v /= 62; |
XXXXXX[5] = letters[v % 62]; |
|
fd = open (pattern, O_BINARY|O_RDWR|O_CREAT|O_EXCL, 0600); |
if (fd >= 0) |
/* The file does not exist. */ |
return fd; |
if (errno != EEXIST |
#ifdef EISDIR |
&& errno != EISDIR |
#endif |
) |
/* Fatal error (EPERM, ENOSPC etc). Doesn't make sense to loop. */ |
break; |
|
/* This is a random value. It is only necessary that the next |
TMP_MAX values generated by adding 7777 to VALUE are different |
with (module 2^32). */ |
value += 7777; |
} |
|
/* We return the null string if we can't find a unique file name. */ |
pattern[0] = '\0'; |
return -1; |
} |