1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libc/locale/mbrtoc16.c b/lib/libc/locale/mbrtoc16.c
new file mode 100644
index 0000000..a47514c
--- /dev/null
+++ b/lib/libc/locale/mbrtoc16.c
@@ -0,0 +1,89 @@
+/*-
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <uchar.h>
+#include "xlocale_private.h"
+
+typedef struct {
+	char16_t	trail_surrogate;
+	mbstate_t	c32_mbstate;
+} _Char16State;
+
+size_t
+mbrtoc16_l(char16_t * __restrict pc16, const char * __restrict s, size_t n,
+    mbstate_t * __restrict ps, locale_t locale)
+{
+	_Char16State *cs;
+	char32_t c32;
+	ssize_t len;
+
+	FIX_LOCALE(locale);
+	if (ps == NULL)
+		ps = &locale->mbrtoc16;
+	cs = (_Char16State *)ps;
+
+	/*
+	 * Call straight into mbrtoc32_l() if we don't need to return a
+	 * character value. According to the spec, if s is a null
+	 * pointer, the value of parameter pc16 is also ignored.
+	 */
+	if (pc16 == NULL || s == NULL) {
+		cs->trail_surrogate = 0;
+		return (mbrtoc32_l(NULL, s, n, &cs->c32_mbstate, locale));
+	}
+
+	/* Return the trail surrogate from the previous invocation. */
+	if (cs->trail_surrogate >= 0xdc00 && cs->trail_surrogate <= 0xdfff) {
+		*pc16 = cs->trail_surrogate;
+		cs->trail_surrogate = 0;
+		return ((size_t)-3);
+	}
+
+	len = mbrtoc32_l(&c32, s, n, &cs->c32_mbstate, locale);
+	if (len >= 0) {
+		if (c32 < 0x10000) {
+			/* Fits in one UTF-16 character. */
+			*pc16 = c32;
+		} else {
+			/* Split up in a surrogate pair. */
+			c32 -= 0x10000;
+			*pc16 = 0xd800 | (c32 >> 10);
+			cs->trail_surrogate = 0xdc00 | (c32 & 0x3ff);
+		}
+	}
+	return (len);
+}
+
+size_t
+mbrtoc16(char16_t * __restrict pc16, const char * __restrict s, size_t n,
+    mbstate_t * __restrict ps)
+{
+
+	return (mbrtoc16_l(pc16, s, n, ps, __get_locale()));
+}