1 files changed, 132 insertions, 0 deletions
diff --git a/lib/libc/stdio/fgetws.c b/lib/libc/stdio/fgetws.c
new file mode 100644
index 0000000000000..84fc387ecae44
--- /dev/null
+++ b/lib/libc/stdio/fgetws.c
@@ -0,0 +1,132 @@
+/*-
+ * 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 <string.h>
+#include <wchar.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+#include "local.h"
+#include "mblocal.h"
+
+wchar_t *
+fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t locale)
+{
+	int sret;
+	wchar_t *wsp, *ret;
+	size_t nconv;
+	const char *src;
+	unsigned char *nl;
+	FIX_LOCALE(locale);
+	struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
+
+	FLOCKFILE_CANCELSAFE(fp);
+	ORIENT(fp, 1);
+
+	if (n <= 0) {
+		fp->_flags |= __SERR;
+		errno = EINVAL;
+		goto error;
+	}
+
+	wsp = ws;
+	if (n == 1)
+		goto ok;
+
+	if (fp->_r <= 0 && __srefill(fp))
+		/* EOF or ferror */
+		goto error;
+
+	sret = 0;
+	do {
+		src = fp->_p;
+		nl = memchr(fp->_p, '\n', fp->_r);
+		nconv = l->__mbsnrtowcs(wsp, &src,
+		    nl != NULL ? (nl - fp->_p + 1) : fp->_r,
+		    n - 1, &fp->_mbstate);
+		if (nconv == (size_t)-1) {
+			/* Conversion error */
+			fp->_flags |= __SERR;
+			goto error;
+		}
+		if (src == NULL) {
+			/*
+			 * We hit a null byte. Increment the character count,
+			 * since mbsnrtowcs()'s return value doesn't include
+			 * the terminating null, then resume conversion
+			 * after the null.
+			 */
+			nconv++;
+			src = memchr(fp->_p, '\0', fp->_r);
+			src++;
+		}
+		fp->_r -= (unsigned char *)src - fp->_p;
+		fp->_p = (unsigned char *)src;
+		n -= nconv;
+		wsp += nconv;
+	} while ((wsp == ws || wsp[-1] != L'\n') && n > 1 && (fp->_r > 0 ||
+	    (sret = __srefill(fp)) == 0));
+	if (sret && !__sfeof(fp))
+		/* ferror */
+		goto error;
+	if (!l->__mbsinit(&fp->_mbstate)) {
+		/* Incomplete character */
+		fp->_flags |= __SERR;
+		errno = EILSEQ;
+		goto error;
+	}
+	if (wsp == ws)
+		/* EOF */
+		goto error;
+ok:
+	*wsp = L'\0';
+	ret = ws;
+end:
+	FUNLOCKFILE_CANCELSAFE();
+	return (ret);
+
+error:
+	ret = NULL;
+	goto end;
+}
+
+wchar_t *
+fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
+{
+	return fgetws_l(ws, n, fp, __get_locale());
+}