1 files changed, 88 insertions, 0 deletions
diff --git a/lib/libc/locale/mbstowcs.c b/lib/libc/locale/mbstowcs.c
new file mode 100644
index 0000000..7fd8663
--- /dev/null
+++ b/lib/libc/locale/mbstowcs.c
@@ -0,0 +1,88 @@
+/*-
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Paul Borman at Krystal Technologies.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <stddef.h>
+#include <rune.h>
+
+size_t
+mbstowcs(wchar_t * __restrict pwcs, const char * __restrict s, size_t n)
+{
+	const char *e;
+	int cnt;
+	rune_t r;
+
+	if (s == NULL) {
+		errno = EINVAL;
+		return (-1);
+	}
+
+	if (pwcs == NULL) {
+		/* Convert and count only, do not store. */
+		cnt = 0;
+		while ((r = sgetrune(s, MB_LEN_MAX, &e)) != _INVALID_RUNE &&
+		    r != 0) {
+			s = e;
+			cnt++;
+		}
+		if (r == _INVALID_RUNE) {
+			errno = EILSEQ;
+			return (-1);
+		}
+		return (cnt);
+	}
+
+	/* Convert, store and count characters. */
+	cnt = 0;
+	while (n-- > 0) {
+		*pwcs = sgetrune(s, MB_LEN_MAX, &e);
+		if (*pwcs == _INVALID_RUNE) {
+			errno = EILSEQ;
+			return (-1);
+		}
+		if (*pwcs++ == L'\0')
+			break;
+		s = e;
+		++cnt;
+	}
+
+	return (cnt);
+}