1 files changed, 77 insertions, 0 deletions
diff --git a/lib/libc/stdio/ungetwc.c b/lib/libc/stdio/ungetwc.c
new file mode 100644
index 0000000..510648b
--- /dev/null
+++ b/lib/libc/stdio/ungetwc.c
@@ -0,0 +1,77 @@
+/*-
+ * Copyright (c) 2002-2004 Tim J. Robbins.
+ * 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 "namespace.h"
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+#include "local.h"
+#include "mblocal.h"
+
+/*
+ * Non-MT-safe version.
+ */
+wint_t
+__ungetwc(wint_t wc, FILE *fp)
+{
+	char buf[MB_LEN_MAX];
+	size_t len;
+
+	if (wc == WEOF)
+		return (WEOF);
+	if ((len = __wcrtomb(buf, wc, &fp->_extra->mbstate)) == (size_t)-1) {
+		fp->_flags |= __SERR;
+		return (WEOF);
+	}
+	while (len-- != 0)
+		if (__ungetc((unsigned char)buf[len], fp) == EOF)
+			return (WEOF);
+
+	return (wc);
+}
+
+/*
+ * MT-safe version.
+ */
+wint_t
+ungetwc(wint_t wc, FILE *fp)
+{
+	wint_t r;
+
+	FLOCKFILE(fp);
+	ORIENT(fp, 1);
+	r = __ungetwc(wc, fp);
+	FUNLOCKFILE(fp);
+
+	return (r);
+}