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-rw-r--r--lib/tmpdir.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/lib/tmpdir.c b/lib/tmpdir.c
new file mode 100644
index 0000000..9c96a69
--- /dev/null
+++ b/lib/tmpdir.c
@@ -0,0 +1,164 @@
+/* Copyright (C) 1999, 2001-2002, 2006, 2009-2023 Free Software Foundation,
+ Inc.
+ This file is part of the GNU C Library.
+
+ This file 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 3 of the
+ License, or (at your option) any later version.
+
+ This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Extracted from sysdeps/posix/tempname.c. */
+
+#include <config.h>
+
+/* Specification. */
+#include "tmpdir.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;
+}