1 files changed, 111 insertions, 0 deletions
diff --git a/lib/libc/stdio/fgetwc.c b/lib/libc/stdio/fgetwc.c
new file mode 100644
index 0000000000000..edad907fe8065
--- /dev/null
+++ b/lib/libc/stdio/fgetwc.c
@@ -0,0 +1,111 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2002-2004 Tim J. Robbins.
+ * All rights reserved.
+ *
+ * Copyright (c) 2011 The FreeBSD Foundation
+ * All rights reserved.
+ * 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 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 <stdio.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+#include "local.h"
+#include "mblocal.h"
+#include "xlocale_private.h"
+
+/*
+ * MT-safe version.
+ */
+wint_t
+fgetwc_l(FILE *fp, locale_t locale)
+{
+	wint_t r;
+	FIX_LOCALE(locale);
+
+	FLOCKFILE_CANCELSAFE(fp);
+	ORIENT(fp, 1);
+	r = __fgetwc(fp, locale);
+	FUNLOCKFILE_CANCELSAFE();
+
+	return (r);
+}
+
+wint_t
+fgetwc(FILE *fp)
+{
+	return fgetwc_l(fp, __get_locale());
+}
+
+/*
+ * Internal (non-MPSAFE) version of fgetwc().  This version takes an
+ * mbstate_t argument specifying the initial conversion state.  For
+ * wide streams, this should always be fp->_mbstate.  On return, *nread
+ * is set to the number of bytes read.
+ */
+wint_t 
+__fgetwc_mbs(FILE *fp, mbstate_t *mbs, int *nread, locale_t locale)
+{
+	wchar_t wc;
+	size_t nconv;
+	struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
+
+	*nread = 0;
+	if (fp->_r <= 0 && __srefill(fp))
+		return (WEOF);
+	do {
+		nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs);
+		if (nconv == (size_t)-1) {
+			fp->_flags |= __SERR;
+			return (WEOF);
+		} else if (nconv == (size_t)-2)
+			continue;
+		else if (nconv == 0) {
+			fp->_p++;
+			fp->_r--;
+			(*nread)++;
+			return (L'\0');
+		} else {
+			fp->_p += nconv;
+			fp->_r -= nconv;
+			*nread += nconv;
+			return (wc);
+		}
+	} while (__srefill(fp) == 0);
+	if (__sfeof(fp)) {
+		fp->_flags |= __SERR;
+		errno = EILSEQ;
+	}
+	return (WEOF);
+}