--- /dev/null
+++ Libc/Libc-1272.200.26/tests/strerror.c
@@ -0,0 +1,134 @@
+/*-
+ * Copyright (c) 2001 Wes Peters <wes@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "darwintest.h"
+
+static char buf[64];
+static char *sret;
+static int iret;
+
+T_DECL(strerror, "")
+{
+	//T_DECL(strerror_unknown_error, "")
+	errno = 0;
+	sret = strerror(INT_MAX);
+	snprintf(buf, sizeof(buf), "Unknown error: %d", INT_MAX);
+	T_EXPECT_EQ_STR(sret, buf, NULL);
+	T_EXPECT_EQ(errno, EINVAL, NULL);
+
+	//T_DECL(strerror_no_error, "")
+	errno = 0;
+	sret = strerror(0);
+	T_EXPECT_EQ_STR(sret, "Undefined error: 0", NULL);
+	T_EXPECT_EQ(errno, 0, NULL);
+
+	//T_DECL(strerror_EPERM_test, "")
+	errno = 0;
+	sret = strerror(EPERM);
+	T_EXPECT_EQ_STR(sret, "Operation not permitted", NULL);
+	T_EXPECT_EQ(errno, 0, NULL);
+
+	//T_DECL(strerror_EPFNOSUPPORT_test, "")
+	errno = 0;
+	sret = strerror(EPFNOSUPPORT);
+	T_EXPECT_EQ_STR(sret, "Protocol family not supported", NULL);
+	T_EXPECT_EQ(errno, 0, NULL);
+
+	//T_DECL(strerror_ELAST_test, "")
+	errno = 0;
+	sret = strerror(ELAST);
+	T_EXPECT_EQ(errno, 0, NULL);
+}
+
+T_DECL(strerror_r, "")
+{
+	memset(buf, '*', sizeof(buf));
+	iret = strerror_r(-1, buf, sizeof(buf));
+	T_EXPECT_EQ_STR(buf, "Unknown error: -1", NULL);
+	T_EXPECT_EQ(iret, EINVAL, NULL);
+
+	//T_DECL(strerror_r__EPERM_one_byte_short, "")
+	memset(buf, '*', sizeof(buf));
+	/* One byte too short. */
+	iret = strerror_r(EPERM, buf, strlen("Operation not permitted"));
+	T_EXPECT_EQ_STR(buf, "Operation not permitte", NULL);
+	T_EXPECT_EQ(iret, ERANGE, NULL);
+
+	//T_DECL(strerror_r__EPERM_unknown_error_one_byte_short, "")
+	memset(buf, '*', sizeof(buf));
+	/* One byte too short. */
+	iret = strerror_r(-1, buf, strlen("Unknown error: -1"));
+	T_EXPECT_EQ_STR(buf, "Unknown error: -", NULL);
+	T_EXPECT_EQ(iret, EINVAL, NULL);
+
+	//T_DECL(strerror_r__EPERM_unknown_error_two_bytes_short, "")
+	memset(buf, '*', sizeof(buf));
+	/* Two bytes too short. */
+	iret = strerror_r(-2, buf, strlen("Unknown error: -2") - 1);
+	T_EXPECT_EQ_STR(buf, "Unknown error: ", NULL);
+	T_EXPECT_EQ(iret, EINVAL, NULL);
+
+	//T_DECL(strerror_r__EPERM_unknown_error_three_bytes_short, "")
+	memset(buf, '*', sizeof(buf));
+	/* Three bytes too short. */
+	iret = strerror_r(-2, buf, strlen("Unknown error: -2") - 2);
+	T_EXPECT_EQ_STR(buf, "Unknown error:", NULL);
+	T_EXPECT_EQ(iret, EINVAL, NULL);
+
+	//T_DECL(strerror_r__EPERM_unknown_error_12345_one_byte_short, "")
+	memset(buf, '*', sizeof(buf));
+	/* One byte too short. */
+	iret = strerror_r(12345, buf, strlen("Unknown error: 12345"));
+	T_EXPECT_EQ_STR(buf, "Unknown error: 1234", NULL);
+	T_EXPECT_EQ(iret, EINVAL, NULL);
+
+	//T_DECL(strerror_r__no_error, "")
+	memset(buf, '*', sizeof(buf));
+	iret = strerror_r(0, buf, sizeof(buf));
+	T_EXPECT_EQ_STR(buf, "Undefined error: 0", NULL);
+	T_EXPECT_EQ(iret, 0, NULL);
+
+	//T_DECL(strerror_r__EDEADLK, "")
+	memset(buf, '*', sizeof(buf));
+	iret = strerror_r(EDEADLK, buf, sizeof(buf));
+	T_EXPECT_EQ_STR(buf, "Resource deadlock avoided", NULL);
+	T_EXPECT_EQ(iret, 0, NULL);
+
+	//T_DECL(strerror_r__EPROCLIM, "")
+	memset(buf, '*', sizeof(buf));
+	iret = strerror_r(EPROCLIM, buf, sizeof(buf));
+	T_EXPECT_EQ_STR(buf, "Too many processes", NULL);
+	T_EXPECT_EQ(iret, 0, NULL);
+}