Switch to upstream OpenBSD mktemp.c.

Almost all of our stdio is actually OpenBSD, so although this isn't
really a core part of stdio (it doesn't touch struct FILE, for example)
it probably makes sense for it to come from the same upstream. My
actual motivation though is that it's the only FreeBSD file we have
compiler warnings from.

This patch moves us over to -Werror by default, with only the DNS code
having -Wno-error.

Change-Id: Id244a5b445cba41b0a1ca30298ca7b1ed177810c

3 files changed, 149 insertions, 206 deletions

diff --git a/libc/Android.mk b/libc/Android.mk
index 51ca264..0f9cf6a 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -234,7 +234,6 @@ libc_upstream_freebsd_src_files := \
     upstream-freebsd/lib/libc/stdio/fclose.c \
     upstream-freebsd/lib/libc/stdio/flags.c \
     upstream-freebsd/lib/libc/stdio/fopen.c \
-    upstream-freebsd/lib/libc/stdio/mktemp.c \
     upstream-freebsd/lib/libc/stdlib/abs.c \
     upstream-freebsd/lib/libc/stdlib/getopt_long.c \
     upstream-freebsd/lib/libc/stdlib/imaxabs.c \
@@ -414,6 +413,7 @@ libc_upstream_openbsd_src_files := \
     upstream-openbsd/lib/libc/stdio/getwc.c \
     upstream-openbsd/lib/libc/stdio/getwchar.c \
     upstream-openbsd/lib/libc/stdio/makebuf.c \
+    upstream-openbsd/lib/libc/stdio/mktemp.c \
     upstream-openbsd/lib/libc/stdio/perror.c \
     upstream-openbsd/lib/libc/stdio/printf.c \
     upstream-openbsd/lib/libc/stdio/putc.c \
@@ -496,6 +496,7 @@ libc_common_cflags += \
     -Werror=pointer-to-int-cast \
     -Werror=int-to-pointer-cast \
     -Werror=type-limits \
+    -Werror \
 
 ifeq ($(strip $(DEBUG_BIONIC_LIBC)),true)
   libc_common_cflags += -DDEBUG
@@ -565,7 +566,7 @@ endef
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := bionic/__stack_chk_fail.cpp
-LOCAL_CFLAGS := $(libc_common_cflags) -fno-stack-protector -Werror
+LOCAL_CFLAGS := $(libc_common_cflags) -fno-stack-protector
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
 LOCAL_C_INCLUDES := $(libc_common_c_includes)
@@ -589,7 +590,6 @@ LOCAL_SRC_FILES += upstream-openbsd/lib/libc/time/wcsftime.c
 
 LOCAL_CFLAGS := $(libc_common_cflags) \
     -fvisibility=hidden \
-    -Werror \
 
 # Don't use ridiculous amounts of stack.
 LOCAL_CFLAGS += -DALL_STATE
@@ -631,12 +631,13 @@ LOCAL_CFLAGS := \
     -DANDROID_CHANGES \
     -DINET6 \
     -fvisibility=hidden \
+    -Wno-unused-parameter \
     -I$(LOCAL_PATH)/dns/include \
     -I$(LOCAL_PATH)/private \
     -I$(LOCAL_PATH)/upstream-netbsd/lib/libc/include \
     -I$(LOCAL_PATH)/upstream-netbsd/android/include \
     -include netbsd-compat.h \
-#    -Werror \
+    -Wno-error \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
@@ -665,7 +666,6 @@ LOCAL_CFLAGS := \
     -I$(LOCAL_PATH)/upstream-freebsd/android/include \
     -I$(LOCAL_PATH)/upstream-freebsd/lib/libc/include \
     -include freebsd-compat.h \
-#    -Werror \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
@@ -691,7 +691,6 @@ LOCAL_SRC_FILES := $(libc_upstream_netbsd_src_files)
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \
     -Wno-sign-compare -Wno-uninitialized \
-    -Werror \
     -DPOSIX_MISTAKE \
     -I$(LOCAL_PATH)/upstream-netbsd/android/include \
     -I$(LOCAL_PATH)/upstream-netbsd/lib/libc/include \
@@ -722,7 +721,6 @@ LOCAL_SRC_FILES := $(libc_upstream_openbsd_src_files)
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \
     -Wno-sign-compare -Wno-uninitialized -Wno-unused-parameter \
-    -Werror \
     -I$(LOCAL_PATH)/upstream-openbsd/android/include \
     -I$(LOCAL_PATH)/upstream-openbsd/lib/libc/include \
     -I$(LOCAL_PATH)/upstream-openbsd/lib/libc/gdtoa/ \
@@ -753,7 +751,6 @@ LOCAL_SRC_FILES_64 := $(libc_upstream_openbsd_gdtoa_src_files_64)
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \
     -Wno-sign-compare -Wno-uninitialized \
-    -Werror \
     -fvisibility=hidden \
     -I$(LOCAL_PATH)/upstream-openbsd/android/include \
     -I$(LOCAL_PATH)/upstream-openbsd/lib/libc/include \
@@ -778,7 +775,6 @@ include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := $(libc_bionic_src_files)
 LOCAL_CFLAGS := $(libc_common_cflags) \
-    -Werror \
     -Wframe-larger-than=2048 \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
@@ -874,7 +870,6 @@ LOCAL_SRC_FILES := \
 LOCAL_C_INCLUDES := $(libc_common_c_includes)
 LOCAL_CFLAGS := $(libc_common_cflags) \
     -DLIBC_STATIC \
-    -Werror \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
@@ -896,7 +891,6 @@ include $(BUILD_STATIC_LIBRARY)
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES := $(libc_malloc_src)
 LOCAL_CFLAGS := $(libc_common_cflags) \
-    -Werror \
     -fvisibility=hidden \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
@@ -920,7 +914,6 @@ LOCAL_SRC_FILES := \
 
 LOCAL_CFLAGS := $(libc_common_cflags) \
     -DLIBC_STATIC \
-    -Werror \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
@@ -940,7 +933,7 @@ include $(BUILD_STATIC_LIBRARY)
 # ========================================================
 include $(CLEAR_VARS)
 
-LOCAL_CFLAGS := $(libc_common_cflags) -Werror
+LOCAL_CFLAGS := $(libc_common_cflags)
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
 LOCAL_C_INCLUDES := $(libc_common_c_includes)
@@ -1010,7 +1003,6 @@ include $(CLEAR_VARS)
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \
     -DMALLOC_LEAK_CHECK \
-    -Werror \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
@@ -1046,7 +1038,6 @@ include $(CLEAR_VARS)
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \
     -DMALLOC_QEMU_INSTRUMENT \
-    -Werror \
 
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)
diff --git a/libc/upstream-freebsd/lib/libc/stdio/mktemp.c b/libc/upstream-freebsd/lib/libc/stdio/mktemp.c
deleted file mode 100644
index 58783dd..0000000
--- a/libc/upstream-freebsd/lib/libc/stdio/mktemp.c
+++ /dev/null
@@ -1,191 +0,0 @@
-/*
- * 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-openbsd/lib/libc/stdio/mktemp.c b/libc/upstream-openbsd/lib/libc/stdio/mktemp.c
new file mode 100644
index 0000000..cb154c4
--- /dev/null
+++ b/libc/upstream-openbsd/lib/libc/stdio/mktemp.c
@@ -0,0 +1,143 @@
+/*	$OpenBSD: mktemp.c,v 1.33 2014/05/06 22:55:27 millert Exp $ */
+/*
+ * Copyright (c) 1996-1998, 2008 Theo de Raadt
+ * Copyright (c) 1997, 2008-2009 Todd C. Miller
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+
+#define MKTEMP_NAME	0
+#define MKTEMP_FILE	1
+#define MKTEMP_DIR	2
+
+#define TEMPCHARS	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+#define NUM_CHARS	(sizeof(TEMPCHARS) - 1)
+#define MIN_X		6
+
+#ifndef nitems
+#define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
+#endif
+
+static int
+mktemp_internal(char *path, int slen, int mode)
+{
+	char *start, *cp, *ep;
+	const char *tempchars = TEMPCHARS;
+	unsigned int tries;
+	struct stat sb;
+	size_t len;
+	int fd;
+
+	len = strlen(path);
+	if (len < MIN_X || slen < 0 || (size_t)slen > len - MIN_X) {
+		errno = EINVAL;
+		return(-1);
+	}
+	ep = path + len - slen;
+
+	for (start = ep; start > path && start[-1] == 'X'; start--)
+		;
+	if (ep - start < MIN_X) {
+		errno = EINVAL;
+		return(-1);
+	}
+
+	tries = INT_MAX;
+	do {
+		cp = start;
+		do {
+			unsigned short rbuf[16];
+			unsigned int i;
+
+			/*
+			 * Avoid lots of arc4random() calls by using
+			 * a buffer sized for up to 16 Xs at a time.
+			 */
+			arc4random_buf(rbuf, sizeof(rbuf));
+			for (i = 0; i < nitems(rbuf) && cp != ep; i++)
+				*cp++ = tempchars[rbuf[i] % NUM_CHARS];
+		} while (cp != ep);
+
+		switch (mode) {
+		case MKTEMP_NAME:
+			if (lstat(path, &sb) != 0)
+				return(errno == ENOENT ? 0 : -1);
+			break;
+		case MKTEMP_FILE:
+			fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
+			if (fd != -1 || errno != EEXIST)
+				return(fd);
+			break;
+		case MKTEMP_DIR:
+			if (mkdir(path, S_IRUSR|S_IWUSR|S_IXUSR) == 0)
+				return(0);
+			if (errno != EEXIST)
+				return(-1);
+			break;
+		}
+	} while (--tries);
+
+	errno = EEXIST;
+	return(-1);
+}
+
+char *_mktemp(char *);
+
+char *
+_mktemp(char *path)
+{
+	if (mktemp_internal(path, 0, MKTEMP_NAME) == -1)
+		return(NULL);
+	return(path);
+}
+
+__warn_references(mktemp,
+    "warning: mktemp() possibly used unsafely; consider using mkstemp()");
+
+char *
+mktemp(char *path)
+{
+	return(_mktemp(path));
+}
+
+int
+mkstemp(char *path)
+{
+	return(mktemp_internal(path, 0, MKTEMP_FILE));
+}
+
+int
+mkstemps(char *path, int slen)
+{
+	return(mktemp_internal(path, slen, MKTEMP_FILE));
+}
+
+char *
+mkdtemp(char *path)
+{
+	int error;
+
+	error = mktemp_internal(path, 0, MKTEMP_DIR);
+	return(error ? NULL : path);
+}