1 files changed, 102 insertions, 0 deletions
diff --git a/lib/libc/string/strxfrm.c b/lib/libc/string/strxfrm.c
new file mode 100644
index 000000000000..e327aaf1c2ff
--- /dev/null
+++ b/lib/libc/string/strxfrm.c
@@ -0,0 +1,102 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
+ *		at Electronni Visti IA, Kiev, Ukraine.
+ *			All rights reserved.
+ *
+ * Copyright (c) 2011 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by David Chisnall
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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 ``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 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 <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <wchar.h>
+#include "collate.h"
+
+size_t
+strxfrm_l(char * __restrict dest, const char * __restrict src, size_t len, locale_t loc);
+size_t
+strxfrm(char * __restrict dest, const char * __restrict src, size_t len)
+{
+	return strxfrm_l(dest, src, len, __get_locale());
+}
+
+size_t
+strxfrm_l(char * __restrict dest, const char * __restrict src, size_t len, locale_t locale)
+{
+	size_t slen;
+	size_t xlen;
+	wchar_t *wcs = NULL;
+
+	FIX_LOCALE(locale);
+	struct xlocale_collate *table =
+		(struct xlocale_collate*)locale->components[XLC_COLLATE];
+
+	if (!*src) {
+		if (len > 0)
+			*dest = '\0';
+		return (0);
+	}
+
+	/*
+	 * The conversion from multibyte to wide character strings is
+	 * strictly reducing (one byte of an mbs cannot expand to more
+	 * than one wide character.)
+	 */
+	slen = strlen(src);
+
+	if (table->__collate_load_error)
+		goto error;
+
+	if ((wcs = malloc((slen + 1) * sizeof (wchar_t))) == NULL)
+		goto error;
+
+	if (mbstowcs_l(wcs, src, slen + 1, locale) == (size_t)-1)
+		goto error;
+
+	if ((xlen = _collate_sxfrm(table, wcs, dest, len)) == (size_t)-1)
+		goto error;
+
+	free(wcs);
+
+	if (len > xlen) {
+		dest[xlen] = 0;
+	} else if (len) {
+		dest[len-1] = 0;
+	}
+
+	return (xlen);
+
+error:
+	/* errno should be set to ENOMEM if malloc failed */
+	free(wcs);
+	strlcpy(dest, src, len);
+
+	return (slen);
+}