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diff --git a/tools/regression/lib/libc/locale/test-c16rtomb.c b/tools/regression/lib/libc/locale/test-c16rtomb.c
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+/*-
+ * Copyright (c) 2002 Tim J. Robbins
+ * All rights reserved.
+ *
+ * Copyright (c) 2013 Ed Schouten <ed@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.
+ */
+/*
+ * Test program for c16rtomb() as specified by ISO/IEC 9899:2011.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <uchar.h>
+
+int
+main(int argc, char *argv[])
+{
+ mbstate_t s;
+ char buf[MB_LEN_MAX + 1];
+
+ /*
+ * C/POSIX locale.
+ */
+
+ printf("1..1\n");
+
+ /*
+ * If the buffer argument is NULL, c16 is implicitly 0,
+ * c16rtomb() resets its internal state.
+ */
+ assert(c16rtomb(NULL, L'\0', NULL) == 1);
+ assert(c16rtomb(NULL, 0xdc00, NULL) == 1);
+
+ /* Null wide character. */
+ memset(&s, 0, sizeof(s));
+ memset(buf, 0xcc, sizeof(buf));
+ assert(c16rtomb(buf, 0, &s) == 1);
+ assert((unsigned char)buf[0] == 0 && (unsigned char)buf[1] == 0xcc);
+
+ /* Latin letter A, internal state. */
+ assert(c16rtomb(NULL, L'\0', NULL) == 1);
+ assert(c16rtomb(NULL, L'A', NULL) == 1);
+
+ /* Latin letter A. */
+ memset(&s, 0, sizeof(s));
+ memset(buf, 0xcc, sizeof(buf));
+ assert(c16rtomb(buf, L'A', &s) == 1);
+ assert((unsigned char)buf[0] == 'A' && (unsigned char)buf[1] == 0xcc);
+
+ /* Unicode character 'Pile of poo'. */
+ memset(&s, 0, sizeof(s));
+ memset(buf, 0xcc, sizeof(buf));
+ assert(c16rtomb(buf, 0xd83d, &s) == 0);
+ assert(c16rtomb(buf, 0xdca9, &s) == (size_t)-1);
+ assert(errno == EILSEQ);
+
+ /*
+ * UTF-8.
+ */
+
+ assert(strcmp(setlocale(LC_CTYPE, "en_US.UTF-8"), "en_US.UTF-8") == 0);
+
+ /* Unicode character 'Pile of poo'. */
+ memset(&s, 0, sizeof(s));
+ memset(buf, 0xcc, sizeof(buf));
+ assert(c16rtomb(buf, 0xd83d, &s) == 0);
+ assert(c16rtomb(buf, 0xdca9, &s) == 4);
+ assert((unsigned char)buf[0] == 0xf0 && (unsigned char)buf[1] == 0x9f &&
+ (unsigned char)buf[2] == 0x92 && (unsigned char)buf[3] == 0xa9 &&
+ (unsigned char)buf[4] == 0xcc);
+
+ /* Invalid code; 'Pile of poo' without the trail surrogate. */
+ memset(&s, 0, sizeof(s));
+ memset(buf, 0xcc, sizeof(buf));
+ assert(c16rtomb(buf, 0xd83d, &s) == 0);
+ assert(c16rtomb(buf, L'A', &s) == (size_t)-1);
+ assert(errno == EILSEQ);
+
+ /* Invalid code; 'Pile of poo' without the lead surrogate. */
+ memset(&s, 0, sizeof(s));
+ memset(buf, 0xcc, sizeof(buf));
+ assert(c16rtomb(buf, 0xdca9, &s) == (size_t)-1);
+ assert(errno == EILSEQ);
+
+ printf("ok 1 - c16rtomb()\n");
+}