Add fgetwln(3) from FreeBSD and bump libc minor revision.

1 files changed, 81 insertions, 0 deletions

diff --git a/lib/libc/stdio/fgetwln.c b/lib/libc/stdio/fgetwln.c
new file mode 100644
index 00000000000..1b6c64c175a
--- /dev/null
+++ b/lib/libc/stdio/fgetwln.c
@@ -0,0 +1,81 @@
+/*	$OpenBSD: fgetwln.c,v 1.1 2015/01/12 20:58:07 millert Exp $	*/
+
+/*-
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include "local.h"
+
+/*
+ * Expand the line buffer.  Return -1 on error.
+ */
+static int
+__slbexpand(FILE *fp, size_t newsize)
+{
+	void *p;
+
+	if (fp->_lb._size / sizeof(wchar_t) >= newsize)
+		return 0;
+	if ((p = reallocarray(fp->_lb._base, newsize, sizeof(wchar_t))) == NULL)
+		return -1;
+	fp->_lb._base = p;
+	fp->_lb._size = newsize * sizeof(wchar_t);
+	return 0;
+}
+
+wchar_t *
+fgetwln(FILE * __restrict fp, size_t *lenp)
+{
+	wint_t wc;
+	size_t len;
+
+	FLOCKFILE(fp);
+	_SET_ORIENTATION(fp, 1);
+
+	len = 0;
+	while ((wc = __fgetwc_unlock(fp)) != WEOF) {
+#define	GROW	512
+		if (len >= fp->_lb._size / sizeof(wchar_t) &&
+		    __slbexpand(fp, len + GROW))
+			goto error;
+		*((wchar_t *)fp->_lb._base + len++) = wc;
+		if (wc == L'\n')
+			break;
+	}
+	if (len == 0)
+		goto error;
+
+	FUNLOCKFILE(fp);
+	*lenp = len;
+	return (wchar_t *)fp->_lb._base;
+
+error:
+	FUNLOCKFILE(fp);
+	*lenp = 0;
+	return NULL;
+}