Added glib'c temp. path creation routines to stdio-common (the only place
where they are actually used). git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5382 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
parent
76e34f86e5
commit
51d951ad00
340
src/kernel/libroot/posix/glibc/stdio-common/tempname.c
Normal file
340
src/kernel/libroot/posix/glibc/stdio-common/tempname.c
Normal file
@ -0,0 +1,340 @@
|
||||
/* Copyright (C) 1991-1999, 2000, 2001 Free Software Foundation, Inc.
|
||||
This file is part of 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 Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 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
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#if HAVE_CONFIG_H
|
||||
# include <config.h>
|
||||
#endif
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <assert.h>
|
||||
|
||||
#include <errno.h>
|
||||
#ifndef __set_errno
|
||||
# define __set_errno(Val) errno = (Val)
|
||||
#endif
|
||||
|
||||
#include <stdio.h>
|
||||
#ifndef P_tmpdir
|
||||
# define P_tmpdir "/tmp"
|
||||
#endif
|
||||
#ifndef TMP_MAX
|
||||
# define TMP_MAX 238328
|
||||
#endif
|
||||
#ifndef __GT_FILE
|
||||
# define __GT_FILE 0
|
||||
# define __GT_BIGFILE 1
|
||||
# define __GT_DIR 2
|
||||
# define __GT_NOCREATE 3
|
||||
#endif
|
||||
|
||||
#if STDC_HEADERS || _LIBC
|
||||
# include <stddef.h>
|
||||
# include <stdlib.h>
|
||||
# include <string.h>
|
||||
#endif
|
||||
|
||||
#if HAVE_FCNTL_H || _LIBC
|
||||
# include <fcntl.h>
|
||||
#endif
|
||||
|
||||
#if HAVE_SYS_TIME_H || _LIBC
|
||||
# include <sys/time.h>
|
||||
#endif
|
||||
|
||||
#if HAVE_STDINT_H || _LIBC
|
||||
# include <stdint.h>
|
||||
#endif
|
||||
|
||||
#if HAVE_UNISTD_H || _LIBC
|
||||
# include <unistd.h>
|
||||
#endif
|
||||
|
||||
#include <sys/stat.h>
|
||||
#if STAT_MACROS_BROKEN
|
||||
# undef S_ISDIR
|
||||
#endif
|
||||
#if !defined S_ISDIR && defined S_IFDIR
|
||||
# define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
|
||||
#endif
|
||||
#if !S_IRUSR && S_IREAD
|
||||
# define S_IRUSR S_IREAD
|
||||
#endif
|
||||
#if !S_IRUSR
|
||||
# define S_IRUSR 00400
|
||||
#endif
|
||||
#if !S_IWUSR && S_IWRITE
|
||||
# define S_IWUSR S_IWRITE
|
||||
#endif
|
||||
#if !S_IWUSR
|
||||
# define S_IWUSR 00200
|
||||
#endif
|
||||
#if !S_IXUSR && S_IEXEC
|
||||
# define S_IXUSR S_IEXEC
|
||||
#endif
|
||||
#if !S_IXUSR
|
||||
# define S_IXUSR 00100
|
||||
#endif
|
||||
|
||||
#if _LIBC
|
||||
# define struct_stat64 struct stat64
|
||||
#else
|
||||
# define struct_stat64 struct stat
|
||||
# define __getpid getpid
|
||||
# define __gettimeofday gettimeofday
|
||||
# define __mkdir mkdir
|
||||
# define __open open
|
||||
# define __open64 open
|
||||
# define __lxstat64(version, path, buf) lstat (path, buf)
|
||||
# define __xstat64(version, path, buf) stat (path, buf)
|
||||
#endif
|
||||
|
||||
#define __secure_getenv getenv
|
||||
|
||||
#if 0
|
||||
#ifdef _LIBC
|
||||
# include <hp-timing.h>
|
||||
# if HP_TIMING_AVAIL
|
||||
# define RANDOM_BITS(Var) \
|
||||
if (__builtin_expect (value == UINT64_C (0), 0)) \
|
||||
{ \
|
||||
/* If this is the first time this function is used initialize \
|
||||
the variable we accumulate the value in to some somewhat \
|
||||
random value. If we'd not do this programs at startup time \
|
||||
might have a reduced set of possible names, at least on slow \
|
||||
machines. */ \
|
||||
struct timeval tv; \
|
||||
__gettimeofday (&tv, NULL); \
|
||||
value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
|
||||
} \
|
||||
HP_TIMING_NOW (Var)
|
||||
# endif
|
||||
#endif
|
||||
#endif
|
||||
|
||||
/* Use the widest available unsigned type if uint64_t is not
|
||||
available. The algorithm below extracts a number less than 62**6
|
||||
(approximately 2**35.725) from uint64_t, so ancient hosts where
|
||||
uintmax_t is only 32 bits lose about 3.725 bits of randomness,
|
||||
which is better than not having mkstemp at all. */
|
||||
#if !defined UINT64_MAX && !defined uint64_t
|
||||
# define uint64_t uintmax_t
|
||||
#endif
|
||||
|
||||
/* Return nonzero if DIR is an existent directory. */
|
||||
static int
|
||||
direxists(const char *dir)
|
||||
{
|
||||
struct stat st;
|
||||
return stat(dir, &st) == 0 && S_ISDIR(st.st_mode);
|
||||
}
|
||||
|
||||
|
||||
/* Path search algorithm, for tmpnam, tmpfile, etc. If DIR is
|
||||
non-null and exists, uses it; otherwise uses the first of $TMPDIR,
|
||||
P_tmpdir, /tmp that exists. Copies into TMPL a template suitable
|
||||
for use with mk[s]temp. Will fail (-1) if DIR is non-null and
|
||||
doesn't exist, none of the searched dirs exists, or there's not
|
||||
enough space in TMPL. */
|
||||
int
|
||||
__path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
|
||||
int try_tmpdir)
|
||||
{
|
||||
const char *d;
|
||||
size_t dlen, plen;
|
||||
|
||||
if (!pfx || !pfx[0])
|
||||
{
|
||||
pfx = "file";
|
||||
plen = 4;
|
||||
}
|
||||
else
|
||||
{
|
||||
plen = strlen (pfx);
|
||||
if (plen > 5)
|
||||
plen = 5;
|
||||
}
|
||||
|
||||
if (try_tmpdir)
|
||||
{
|
||||
d = __secure_getenv ("TMPDIR");
|
||||
if (d != NULL && direxists (d))
|
||||
dir = d;
|
||||
else if (dir != NULL && direxists (dir))
|
||||
/* nothing */ ;
|
||||
else
|
||||
dir = NULL;
|
||||
}
|
||||
if (dir == NULL)
|
||||
{
|
||||
if (direxists (P_tmpdir))
|
||||
dir = P_tmpdir;
|
||||
else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
|
||||
dir = "/tmp";
|
||||
else
|
||||
{
|
||||
__set_errno (ENOENT);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
dlen = strlen (dir);
|
||||
while (dlen > 1 && dir[dlen - 1] == '/')
|
||||
dlen--; /* remove trailing slashes */
|
||||
|
||||
/* check we have room for "${dir}/${pfx}XXXXXX\0" */
|
||||
if (tmpl_len < dlen + 1 + plen + 6 + 1)
|
||||
{
|
||||
__set_errno (EINVAL);
|
||||
return -1;
|
||||
}
|
||||
|
||||
sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* These are the characters used in temporary filenames. */
|
||||
static const char letters[] =
|
||||
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
|
||||
|
||||
/* Generate a temporary file name based on TMPL. TMPL must match the
|
||||
rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
|
||||
does not exist at the time of the call to __gen_tempname. TMPL is
|
||||
overwritten with the result.
|
||||
|
||||
KIND may be one of:
|
||||
__GT_NOCREATE: simply verify that the name does not exist
|
||||
at the time of the call.
|
||||
__GT_FILE: create the file using open(O_CREAT|O_EXCL)
|
||||
and return a read-write fd. The file is mode 0600.
|
||||
__GT_BIGFILE: same as __GT_FILE but use open64().
|
||||
__GT_DIR: create a directory, which will be mode 0700.
|
||||
|
||||
We use a clever algorithm to get hard-to-predict names. */
|
||||
int
|
||||
__gen_tempname (char *tmpl, int kind)
|
||||
{
|
||||
int len;
|
||||
char *XXXXXX;
|
||||
static uint64_t value;
|
||||
uint64_t random_time_bits;
|
||||
unsigned int count;
|
||||
int fd = -1;
|
||||
int save_errno = errno;
|
||||
struct stat st;
|
||||
|
||||
/* A lower bound on the number of temporary files to attempt to
|
||||
generate. The maximum total number of temporary file names that
|
||||
can exist for a given template is 62**6. It should never be
|
||||
necessary to try all these combinations. Instead if a reasonable
|
||||
number of names is tried (we define reasonable as 62**3) fail to
|
||||
give the system administrator the chance to remove the problems. */
|
||||
unsigned int attempts_min = 62 * 62 * 62;
|
||||
|
||||
/* The number of times to attempt to generate a temporary file. To
|
||||
conform to POSIX, this must be no smaller than TMP_MAX. */
|
||||
unsigned int attempts = attempts_min < TMP_MAX ? TMP_MAX : attempts_min;
|
||||
|
||||
len = strlen (tmpl);
|
||||
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
|
||||
{
|
||||
__set_errno (EINVAL);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* This is where the Xs start. */
|
||||
XXXXXX = &tmpl[len - 6];
|
||||
|
||||
/* Get some more or less random data. */
|
||||
#ifdef RANDOM_BITS
|
||||
RANDOM_BITS (random_time_bits);
|
||||
#else
|
||||
# if HAVE_GETTIMEOFDAY || _LIBC
|
||||
{
|
||||
struct timeval tv;
|
||||
gettimeofday(&tv, NULL);
|
||||
random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
|
||||
}
|
||||
# else
|
||||
random_time_bits = time (NULL);
|
||||
# endif
|
||||
#endif
|
||||
value += random_time_bits ^ getpid();
|
||||
|
||||
for (count = 0; count < attempts; value += 7777, ++count)
|
||||
{
|
||||
uint64_t v = value;
|
||||
|
||||
/* 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];
|
||||
|
||||
switch (kind)
|
||||
{
|
||||
case __GT_FILE:
|
||||
case __GT_BIGFILE:
|
||||
fd = open(tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
|
||||
break;
|
||||
|
||||
case __GT_DIR:
|
||||
fd = mkdir(tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
|
||||
break;
|
||||
|
||||
case __GT_NOCREATE:
|
||||
/* This case is backward from the other three. __gen_tempname
|
||||
succeeds if __xstat fails because the name does not exist.
|
||||
Note the continue to bypass the common logic at the bottom
|
||||
of the loop. */
|
||||
if (stat(tmpl, &st) < 0)
|
||||
{
|
||||
if (errno == ENOENT)
|
||||
{
|
||||
__set_errno (save_errno);
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
/* Give up now. */
|
||||
return -1;
|
||||
}
|
||||
continue;
|
||||
|
||||
default:
|
||||
assert (! "invalid KIND in __gen_tempname");
|
||||
}
|
||||
|
||||
if (fd >= 0)
|
||||
{
|
||||
__set_errno (save_errno);
|
||||
return fd;
|
||||
}
|
||||
else if (errno != EEXIST)
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* We got out of the loop because we ran out of combinations to try. */
|
||||
__set_errno (EEXIST);
|
||||
return -1;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user