1 files changed, 109 insertions, 0 deletions
diff --git a/lib/libc/stdio/fgetwc.c b/lib/libc/stdio/fgetwc.c
new file mode 100644
index 0000000..93438a6
--- /dev/null
+++ b/lib/libc/stdio/fgetwc.c
@@ -0,0 +1,109 @@
+/*-
+ * Copyright (c) 2002 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 <stdio.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+#include "local.h"
+
+static __inline wint_t	__fgetwc_nbf(FILE *);
+
+/*
+ * Non-MT-safe version.
+ */
+wint_t
+__fgetwc(FILE *fp)
+{
+	wint_t wc;
+
+	if (MB_CUR_MAX == 1) {
+		/*
+		 * Assume we're using a single-byte locale. A safer test
+		 * might be to check _CurrentRuneLocale->encoding.
+		 */
+		wc = (wint_t)__sgetc(fp);
+	} else
+		wc = __fgetwc_nbf(fp);
+
+	return (wc);
+}
+
+/*
+ * MT-safe version.
+ */
+wint_t
+fgetwc(FILE *fp)
+{
+	wint_t r;
+
+	FLOCKFILE(fp);
+	ORIENT(fp, 1);
+	r = __fgetwc(fp);
+	FUNLOCKFILE(fp);
+
+	return (r);
+}
+
+static __inline wint_t
+__fgetwc_nbf(FILE *fp)
+{
+	char buf[MB_LEN_MAX];
+	mbstate_t mbs;
+	size_t n, nconv;
+	int c;
+	wchar_t wc;
+
+	n = 0;
+	while (n < MB_CUR_MAX) {
+		if ((c = __sgetc(fp)) == EOF) {
+			if (n == 0)
+				return (WEOF);
+			break;
+		}
+		buf[n++] = (char)c;
+		memset(&mbs, 0, sizeof(mbs));
+		nconv = mbrtowc(&wc, buf, n, &mbs);
+		if (nconv == n)
+			return (wc);
+		else if (nconv == 0)
+			return (L'\0');
+		else if (nconv == (size_t)-1)
+			break;
+	}
+
+	while (n-- != 0)
+		__ungetc((unsigned char)buf[n], fp);
+	errno = EILSEQ;
+	fp->_flags |= __SERR;
+	return (WEOF);
+}