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/* Copyright (C) 1999, 2001-2002, 2006, 2009-2021 Free Software Foundation,
Inc.
This file is part of the GNU C Library.
This program 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.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Extracted from sysdeps/posix/tempname.c. */
#include <config.h>
/* Specification. */
#include "tmpdir.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifndef __set_errno
# define __set_errno(Val) errno = (Val)
#endif
#include <stdio.h>
#ifndef P_tmpdir
# ifdef _P_tmpdir /* native Windows */
# define P_tmpdir _P_tmpdir
# else
# define P_tmpdir "/tmp"
# endif
#endif
#include <sys/stat.h>
#if defined _WIN32 && ! defined __CYGWIN__
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
# include <windows.h>
#endif
#include "pathmax.h"
#if defined _WIN32 && ! defined __CYGWIN__
/* Don't assume that UNICODE is not defined. */
# undef GetTempPath
# define GetTempPath GetTempPathA
#endif
#if _LIBC
# define struct_stat64 struct stat64
#else
# define struct_stat64 struct stat
# define __libc_secure_getenv secure_getenv
# define __xstat64(version, path, buf) stat (path, buf)
#endif
/* Pathname support.
ISSLASH(C) tests whether C is a directory separator character.
*/
#if defined _WIN32 || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
/* Native Windows, Cygwin, OS/2, DOS */
# define ISSLASH(C) ((C) == '/' || (C) == '\\')
#else
/* Unix */
# define ISSLASH(C) ((C) == '/')
#endif
/* Return nonzero if DIR is an existent directory. */
static bool
direxists (const char *dir)
{
struct_stat64 buf;
return __xstat64 (_STAT_VER, dir, &buf) == 0 && S_ISDIR (buf.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,
bool try_tmpdir)
{
const char *d;
size_t dlen, plen;
bool add_slash;
if (!pfx || !pfx[0])
{
pfx = "file";
plen = 4;
}
else
{
plen = strlen (pfx);
if (plen > 5)
plen = 5;
}
if (try_tmpdir)
{
d = __libc_secure_getenv ("TMPDIR");
if (d != NULL && direxists (d))
dir = d;
else if (dir != NULL && direxists (dir))
/* nothing */ ;
else
dir = NULL;
}
if (dir == NULL)
{
#if defined _WIN32 && ! defined __CYGWIN__
char dirbuf[PATH_MAX];
DWORD retval;
/* Find Windows temporary file directory.
We try this before P_tmpdir because Windows defines P_tmpdir to "\\"
and will therefore try to put all temporary files in the root
directory (unless $TMPDIR is set). */
retval = GetTempPath (PATH_MAX, dirbuf);
if (retval > 0 && retval < PATH_MAX && direxists (dirbuf))
dir = dirbuf;
else
#endif
if (direxists (P_tmpdir))
dir = P_tmpdir;
else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
dir = "/tmp";
else
{
__set_errno (ENOENT);
return -1;
}
}
dlen = strlen (dir);
#ifdef __VMS
add_slash = 0;
#else
add_slash = dlen != 0 && !ISSLASH (dir[dlen - 1]);
#endif
/* check we have room for "${dir}/${pfx}XXXXXX\0" */
if (tmpl_len < dlen + add_slash + plen + 6 + 1)
{
__set_errno (EINVAL);
return -1;
}
memcpy (tmpl, dir, dlen);
sprintf (tmpl + dlen, &"/%.*sXXXXXX"[!add_slash], (int) plen, pfx);
return 0;
}
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