Upgrade mktemp.c to the current upstream version.
Yet another archaic relic containing bugs that had been fixed years before the
Android project even started...
Bug: 9935113
Change-Id: I3c9d019a216efd609ee568cf8c70bc360f357403
diff --git a/libc/upstream-freebsd/lib/libc/stdio/mktemp.c b/libc/upstream-freebsd/lib/libc/stdio/mktemp.c
new file mode 100644
index 0000000..58783dd
--- /dev/null
+++ b/libc/upstream-freebsd/lib/libc/stdio/mktemp.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 1987, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include "un-namespace.h"
+
+char *_mktemp(char *);
+
+static int _gettemp(char *, int *, int, int);
+
+static const unsigned char padchar[] =
+"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+int
+mkstemps(char *path, int slen)
+{
+ int fd;
+
+ return (_gettemp(path, &fd, 0, slen) ? fd : -1);
+}
+
+int
+mkstemp(char *path)
+{
+ int fd;
+
+ return (_gettemp(path, &fd, 0, 0) ? fd : -1);
+}
+
+char *
+mkdtemp(char *path)
+{
+ return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
+}
+
+char *
+_mktemp(char *path)
+{
+ return (_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);
+}
+
+__warn_references(mktemp,
+ "warning: mktemp() possibly used unsafely; consider using mkstemp()");
+
+char *
+mktemp(char *path)
+{
+ return (_mktemp(path));
+}
+
+static int
+_gettemp(char *path, int *doopen, int domkdir, int slen)
+{
+ char *start, *trv, *suffp, *carryp;
+ char *pad;
+ struct stat sbuf;
+ int rval;
+ uint32_t rand;
+ char carrybuf[MAXPATHLEN];
+
+ if ((doopen != NULL && domkdir) || slen < 0) {
+ errno = EINVAL;
+ return (0);
+ }
+
+ for (trv = path; *trv != '\0'; ++trv)
+ ;
+ if (trv - path >= MAXPATHLEN) {
+ errno = ENAMETOOLONG;
+ return (0);
+ }
+ trv -= slen;
+ suffp = trv;
+ --trv;
+ if (trv < path || NULL != strchr(suffp, '/')) {
+ errno = EINVAL;
+ return (0);
+ }
+
+ /* Fill space with random characters */
+ while (trv >= path && *trv == 'X') {
+ rand = arc4random_uniform(sizeof(padchar) - 1);
+ *trv-- = padchar[rand];
+ }
+ start = trv + 1;
+
+ /* save first combination of random characters */
+ memcpy(carrybuf, start, suffp - start);
+
+ /*
+ * check the target directory.
+ */
+ if (doopen != NULL || domkdir) {
+ for (; trv > path; --trv) {
+ if (*trv == '/') {
+ *trv = '\0';
+ rval = stat(path, &sbuf);
+ *trv = '/';
+ if (rval != 0)
+ return (0);
+ if (!S_ISDIR(sbuf.st_mode)) {
+ errno = ENOTDIR;
+ return (0);
+ }
+ break;
+ }
+ }
+ }
+
+ for (;;) {
+ if (doopen) {
+ if ((*doopen =
+ _open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
+ return (1);
+ if (errno != EEXIST)
+ return (0);
+ } else if (domkdir) {
+ if (mkdir(path, 0700) == 0)
+ return (1);
+ if (errno != EEXIST)
+ return (0);
+ } else if (lstat(path, &sbuf))
+ return (errno == ENOENT);
+
+ /* If we have a collision, cycle through the space of filenames */
+ for (trv = start, carryp = carrybuf;;) {
+ /* have we tried all possible permutations? */
+ if (trv == suffp)
+ return (0); /* yes - exit with EEXIST */
+ pad = strchr(padchar, *trv);
+ if (pad == NULL) {
+ /* this should never happen */
+ errno = EIO;
+ return (0);
+ }
+ /* increment character */
+ *trv = (*++pad == '\0') ? padchar[0] : *pad;
+ /* carry to next position? */
+ if (*trv == *carryp) {
+ /* increment position and loop */
+ ++trv;
+ ++carryp;
+ } else {
+ /* try with new name */
+ break;
+ }
+ }
+ }
+ /*NOTREACHED*/
+}
diff --git a/libc/upstream-freebsd/namespace.h b/libc/upstream-freebsd/namespace.h
index a3f850e..a980b57 100644
--- a/libc/upstream-freebsd/namespace.h
+++ b/libc/upstream-freebsd/namespace.h
@@ -17,4 +17,6 @@
#ifndef _BIONIC_FREEBSD_NAMESPACE_H_included
#define _BIONIC_FREEBSD_NAMESPACE_H_included
+__attribute__((visibility("hidden"))) char* _mktemp(char*);
+
#endif