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+/* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Library General Public License as
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+ published by the Free Software Foundation; either version 2 of the
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+ License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Library General Public License for more details.
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+
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+ You should have received a copy of the GNU Library General Public
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+ License along with the GNU C Library; see the file COPYING.LIB. If not,
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+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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+ Boston, MA 02111-1307, USA. */
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+
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+#include <stddef.h>
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+#include <stdint.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <errno.h>
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+#include <sys/types.h>
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+#include <sys/stat.h>
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+#include <fcntl.h>
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+#include <unistd.h>
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+#include <sys/time.h>
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+
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+/* Return nonzero if DIR is an existent directory. */
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+static int direxists (const char *dir)
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+{
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+ struct stat buf;
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+ return stat(dir, &buf) == 0 && S_ISDIR (buf.st_mode);
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+}
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+
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+/* Path search algorithm, for tmpnam, tmpfile, etc. If DIR is
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+ non-null and exists, uses it; otherwise uses the first of $TMPDIR,
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+ P_tmpdir, /tmp that exists. Copies into TMPL a template suitable
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+ for use with mk[s]temp. Will fail (-1) if DIR is non-null and
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+ doesn't exist, none of the searched dirs exists, or there's not
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+ enough space in TMPL. */
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+int __path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
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+ int try_tmpdir)
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+{
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+ //const char *d;
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+ size_t dlen, plen;
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+
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+ if (!pfx || !pfx[0])
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+ {
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+ pfx = "file";
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+ plen = 4;
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+ }
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+ else
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+ {
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+ plen = strlen (pfx);
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+ if (plen > 5)
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+ plen = 5;
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+ }
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+
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+#if 0
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+ if (try_tmpdir)
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+ {
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+ d = __secure_getenv ("TMPDIR");
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+ if (d != NULL && direxists (d))
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+ dir = d;
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+ else if (dir != NULL && direxists (dir))
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+ /* nothing */ ;
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+ else
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+ dir = NULL;
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+ }
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+#endif
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+ if (dir == NULL)
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+ {
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+ if (direxists (P_tmpdir))
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+ dir = P_tmpdir;
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+ else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
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+ dir = "/tmp";
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+ else
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+ {
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+ __set_errno (ENOENT);
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+ return -1;
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+ }
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+ }
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+
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+ dlen = strlen (dir);
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+ while (dlen > 1 && dir[dlen - 1] == '/')
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+ dlen--; /* remove trailing slashes */
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+
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+ /* check we have room for "${dir}/${pfx}XXXXXX\0" */
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+ if (tmpl_len < dlen + 1 + plen + 6 + 1)
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+ {
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+ __set_errno (EINVAL);
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+ return -1;
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+ }
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+
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+ sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
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+ return 0;
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+}
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+
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+/* These are the characters used in temporary filenames. */
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+static const char letters[] =
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+"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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+
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+/* Generate a temporary file name based on TMPL. TMPL must match the
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+ rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
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+ does not exist at the time of the call to __gen_tempname. TMPL is
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+ overwritten with the result. If OPENIT is nonzero, creates the
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+ file and returns a read-write fd; the file is mode 0600 modulo
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+ umask. If LARGEFILE is nonzero, uses open64() instead of open().
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+
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+ We use a clever algorithm to get hard-to-predict names. */
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+int __gen_tempname (char *tmpl, int openit)
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+{
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+ int len;
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+ char *XXXXXX;
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+ static uint64_t value;
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+ struct timeval tv;
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+ int count, fd;
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+ int save_errno = errno;
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+
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+ len = strlen (tmpl);
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+ if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
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+ {
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+ __set_errno (EINVAL);
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+ return -1;
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+ }
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+
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+ /* This is where the Xs start. */
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+ XXXXXX = &tmpl[len - 6];
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+
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+ /* Get some more or less random data. */
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+ gettimeofday (&tv, NULL);
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+ value += ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
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+
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+ for (count = 0; count < TMP_MAX; value += 7777, ++count)
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+ {
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+ uint64_t v = value;
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+
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+ /* Fill in the random bits. */
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+ XXXXXX[0] = letters[v % 62];
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+ v /= 62;
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+ XXXXXX[1] = letters[v % 62];
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+ v /= 62;
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+ XXXXXX[2] = letters[v % 62];
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+ v /= 62;
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+ XXXXXX[3] = letters[v % 62];
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+ v /= 62;
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+ XXXXXX[4] = letters[v % 62];
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+ v /= 62;
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+ XXXXXX[5] = letters[v % 62];
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+
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+ if (openit)
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+ {
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+ fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, 0600);
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+ if (fd >= 0)
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+ {
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+ __set_errno (save_errno);
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+ return fd;
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+ }
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+ else if (errno != EEXIST)
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+ /* Any other error will apply also to other names we might
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+ try, and there are 2^32 or so of them, so give up now. */
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+ return -1;
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+ }
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+ else
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+ {
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+ struct stat st;
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+ if (stat (tmpl, &st) < 0)
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+ {
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+ if (errno == ENOENT)
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+ {
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+ __set_errno (save_errno);
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+ return 0;
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+ }
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+ else
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+ /* Give up now. */
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+ return -1;
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+ }
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+ }
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+ }
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+
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+ /* We got out of the loop because we ran out of combinations to try. */
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+ __set_errno (EEXIST);
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+ return -1;
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+}
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Eric Andersen