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/*
* tmpfile.c - functions to create and safely open temp files for the shell.
*/
/* Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <bashtypes.h>
#include <posixstat.h>
#include <posixtime.h>
#include <filecntl.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <shell.h>
#ifndef errno
extern int errno;
#endif
#define BASEOPENFLAGS (O_CREAT | O_TRUNC | O_EXCL)
#define DEFAULT_TMPDIR "." /* bogus default, should be changed */
#define DEFAULT_NAMEROOT "shtmp"
extern pid_t dollar_dollar_pid;
static char *get_sys_tmpdir __P((void));
static char *get_tmpdir __P((int));
static char *sys_tmpdir = (char *)NULL;
static int ntmpfiles;
static int tmpnamelen = -1;
static unsigned long filenum = 1L;
static char *
get_sys_tmpdir ()
{
if (sys_tmpdir)
return sys_tmpdir;
#ifdef P_tmpdir
sys_tmpdir = P_tmpdir;
if (file_iswdir (sys_tmpdir))
return sys_tmpdir;
#endif
sys_tmpdir = "/tmp";
if (file_iswdir (sys_tmpdir))
return sys_tmpdir;
sys_tmpdir = "/var/tmp";
if (file_iswdir (sys_tmpdir))
return sys_tmpdir;
sys_tmpdir = "/usr/tmp";
if (file_iswdir (sys_tmpdir))
return sys_tmpdir;
sys_tmpdir = DEFAULT_TMPDIR;
return sys_tmpdir;
}
static char *
get_tmpdir (flags)
int flags;
{
char *tdir;
tdir = (flags & MT_USETMPDIR) ? get_string_value ("TMPDIR") : (char *)NULL;
if (tdir && (file_iswdir (tdir) == 0 || strlen (tdir) > PATH_MAX))
tdir = 0;
if (tdir == 0)
tdir = get_sys_tmpdir ();
#if defined (HAVE_PATHCONF) && defined (_PC_NAME_MAX)
if (tmpnamelen == -1)
tmpnamelen = pathconf (tdir, _PC_NAME_MAX);
#else
tmpnamelen = 0;
#endif
return tdir;
}
char *
sh_mktmpname (nameroot, flags)
char *nameroot;
int flags;
{
char *filename, *tdir, *lroot;
struct stat sb;
int r, tdlen;
filename = (char *)xmalloc (PATH_MAX + 1);
tdir = get_tmpdir (flags);
tdlen = strlen (tdir);
lroot = nameroot ? nameroot : DEFAULT_NAMEROOT;
#ifdef USE_MKTEMP
sprintf (filename, "%s/%s.XXXXXX", tdir, lroot);
if (mktemp (filename) == 0)
{
free (filename);
filename = NULL;
}
#else /* !USE_MKTEMP */
while (1)
{
filenum = (filenum << 1) ^
(unsigned long) time ((time_t *)0) ^
(unsigned long) dollar_dollar_pid ^
(unsigned long) ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++);
sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum);
if (tmpnamelen > 0 && tmpnamelen < 32)
filename[tdlen + 1 + tmpnamelen] = '\0';
# ifdef HAVE_LSTAT
r = lstat (filename, &sb);
# else
r = stat (filename, &sb);
# endif
if (r < 0 && errno == ENOENT)
break;
}
#endif /* !USE_MKTEMP */
return filename;
}
int
sh_mktmpfd (nameroot, flags, namep)
char *nameroot;
int flags;
char **namep;
{
char *filename, *tdir, *lroot;
int fd, tdlen;
filename = (char *)xmalloc (PATH_MAX + 1);
tdir = get_tmpdir (flags);
tdlen = strlen (tdir);
lroot = nameroot ? nameroot : DEFAULT_NAMEROOT;
#ifdef USE_MKSTEMP
sprintf (filename, "%s/%s.XXXXXX", tdir, lroot);
fd = mkstemp (filename);
if (fd < 0 || namep == 0)
{
free (filename);
filename = NULL;
}
if (namep)
*namep = filename;
return fd;
#else /* !USE_MKSTEMP */
do
{
filenum = (filenum << 1) ^
(unsigned long) time ((time_t *)0) ^
(unsigned long) dollar_dollar_pid ^
(unsigned long) ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++);
sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum);
if (tmpnamelen > 0 && tmpnamelen < 32)
filename[tdlen + 1 + tmpnamelen] = '\0';
fd = open (filename, BASEOPENFLAGS | ((flags & MT_READWRITE) ? O_RDWR : O_WRONLY), 0600);
}
while (fd < 0 && errno == EEXIST);
if (namep)
*namep = filename;
else
free (filename);
return fd;
#endif /* !USE_MKSTEMP */
}
FILE *
sh_mktmpfp (nameroot, flags, namep)
char *nameroot;
int flags;
char **namep;
{
int fd;
FILE *fp;
fd = sh_mktmpfd (nameroot, flags, namep);
if (fd < 0)
return ((FILE *)NULL);
fp = fdopen (fd, (flags & MT_READWRITE) ? "w+" : "w");
if (fp == 0)
close (fd);
return fp;
}
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