--- /dev/null
+++ Libc/Libc-1725.40.4/tests/netbsd_vis.c
@@ -0,0 +1,194 @@
+/*	$NetBSD: t_vis.c,v 1.7 2014/09/08 19:01:03 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code was contributed to The NetBSD Foundation by Christos Zoulas.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <err.h>
+#include <vis.h>
+
+#include <darwintest.h>
+#include <locale.h>
+
+#include <TargetConditionals.h>
+
+static int styles[] = {
+	VIS_OCTAL,
+	VIS_CSTYLE,
+	VIS_SP,
+	VIS_TAB,
+	VIS_NL,
+	VIS_WHITE,
+	VIS_SAFE,
+#if 0	/* Not reversible */
+	VIS_NOSLASH,
+#endif
+	VIS_HTTP1808,
+	VIS_MIMESTYLE,
+#if 0	/* Not supported by vis(3) */
+	VIS_HTTP1866,
+#endif
+};
+
+#define SIZE	256
+
+T_DECL(strvis_basic, "strvis(3)")
+{
+	char *srcbuf, *dstbuf, *visbuf;
+	unsigned int i, j;
+
+	T_ASSERT_NOTNULL((srcbuf = malloc(SIZE)), NULL);
+	T_ASSERT_NOTNULL((dstbuf = malloc(SIZE + 1)), NULL);
+	T_ASSERT_NOTNULL((visbuf = malloc(SIZE * 4 + 1)), NULL);
+
+	for (i = 0; i < SIZE; i++)
+		srcbuf[i] = (char)i;
+
+	for (i = 0; i < sizeof(styles)/sizeof(styles[0]); i++) {
+		T_ASSERT_GT(strsvisx(visbuf, srcbuf, SIZE, styles[i], ""), 0, NULL);
+		memset(dstbuf, 0, SIZE);
+		T_ASSERT_GT(strunvisx(dstbuf, visbuf, 
+		    styles[i] & (VIS_HTTP1808|VIS_MIMESTYLE)), 0, NULL);
+		for (j = 0; j < SIZE; j++)
+			if (dstbuf[j] != (char)j)
+				T_FAIL("Failed for style %x, char %d [%d]", styles[i], j, dstbuf[j]);
+		if (dstbuf[SIZE] != '\0')
+			T_FAIL("Failed for style %x, the result must be null-terminated [%d]", styles[i], dstbuf[SIZE]);
+	}
+	free(dstbuf);
+	free(srcbuf);
+	free(visbuf);
+}
+
+T_DECL(strvis_null, "strvis(3) NULL")
+{
+	char dst[] = "fail";
+	strvis(dst, NULL, VIS_SAFE);
+	T_ASSERT_EQ(dst[0], '\0', NULL);
+	T_ASSERT_EQ(dst[1], 'a', NULL);
+}
+
+T_DECL(strvis_empty, "strvis(3) empty")
+{
+	char dst[] = "fail";
+	strvis(dst, "", VIS_SAFE);
+	T_ASSERT_EQ(dst[0], '\0', NULL);
+	T_ASSERT_EQ(dst[1], 'a', NULL);
+}
+
+#if TARGET_OS_OSX
+/* rdar://problem/108684957 - multibyte spaces should also be passed through */
+T_DECL(strvis_cstyle_mbspace, "strvis(3) multibyte space")
+{
+	const char str[] = "\xe2\x80\xaf";
+	char dst[(sizeof(str) - 1) * 4];
+	int ret;
+
+	(void)setlocale(LC_CTYPE, "en_US.UTF-8");
+
+	ret = strsnvisx(dst, sizeof(dst), str, sizeof(str) - 1,
+	    VIS_CSTYLE | VIS_NOSLASH, "\\\"\b\f\n\r\t");
+	T_ASSERT_EQ(ret, sizeof(str) - 1, NULL);
+	T_ASSERT_EQ_STR(dst, str, NULL);
+
+	(void)setlocale(LC_CTYPE, "C");
+}
+#endif
+
+T_DECL(strunvis_hex, "strunvis(3) \\Xxx")
+{
+	static const struct {
+		const char *e;
+		const char *d;
+		int error;
+	} ed[] = {
+		{ "\\xff", "\xff", 1 },
+		{ "\\x1", "\x1", 1 },
+		{ "\\x1\\x02", "\x1\x2", 2 },
+		{ "\\x1x", "\x1x", 2 },
+		{ "\\xx", "", -1 },
+	};
+	char uv[10];
+
+	for (size_t i = 0; i < sizeof(ed)/sizeof(ed[0]); i++) {
+		T_ASSERT_EQ(strunvis(uv, ed[i].e), ed[i].error, NULL);
+		if (ed[i].error > 0)
+			T_ASSERT_EQ(memcmp(ed[i].d, uv, (unsigned long)ed[i].error), 0, NULL);
+	}
+}
+
+#define	STRVIS_OVERFLOW_MARKER	0xff	/* Arbitrary */
+
+#if TARGET_OS_OSX
+T_DECL(strvis_overflow_mb, "Test strvis(3) multi-byte overflow")
+{
+	const char src[] = "\xf0\x9f\xa5\x91";
+	/* Extra byte to detect overflow */
+	char dst[sizeof(src) + 1];
+	int n;
+
+	setlocale(LC_CTYPE, "en_US.UTF-8");
+
+	/* Arbitrary */
+	memset(dst, STRVIS_OVERFLOW_MARKER, sizeof(dst));
+
+	/*
+	 * If we only provide four bytes of buffer, we shouldn't be able encode
+	 * a full 4-byte sequence.
+	 */
+	n = strnvis(dst, 4, src, VIS_SAFE);
+	T_ASSERT_EQ_CHAR((unsigned char)dst[4], STRVIS_OVERFLOW_MARKER, NULL);
+	T_ASSERT_EQ(n, -1, NULL);
+
+	n = strnvis(dst, sizeof(src), src, VIS_SAFE);
+	T_ASSERT_EQ(n, sizeof(src) - 1, NULL);
+}
+#endif
+
+T_DECL(strvis_overflow_c, "Test strvis(3) C locale overflow")
+{
+	const char src[] = "AAAA";
+	/* Extra byte to detect overflow */
+	char dst[sizeof(src) + 1];
+	int n;
+
+	/* Arbitrary */
+	memset(dst, STRVIS_OVERFLOW_MARKER, sizeof(dst));
+
+	/*
+	 * If we only provide four bytes of buffer, we shouldn't be able encode
+	 * 4 bytes of input.
+	 */
+	n = strnvis(dst, 4, src, VIS_SAFE | VIS_NOLOCALE);
+	T_ASSERT_EQ_CHAR((unsigned char)dst[4], STRVIS_OVERFLOW_MARKER, NULL);
+	T_ASSERT_EQ(n, -1, NULL);
+
+	n = strnvis(dst, sizeof(src), src, VIS_SAFE | VIS_NOLOCALE);
+	T_ASSERT_EQ(n, sizeof(src) - 1, NULL);
+}