1 files changed, 56 insertions, 0 deletions
diff --git a/usr/src/lib/libbc/libc/stdio/common/ungetc.c b/usr/src/lib/libbc/libc/stdio/common/ungetc.c
new file mode 100644
index 0000000000..f6c5f8b8f4
--- /dev/null
+++ b/usr/src/lib/libbc/libc/stdio/common/ungetc.c
@@ -0,0 +1,56 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 1988 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*      Copyright (c) 1984 AT&T */
+/*        All Rights Reserved   */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"  /* from S5R2 2.1 */
+
+/*LINTLIBRARY*/
+#include <stdio.h>
+
+int
+ungetc(c, iop)
+int	c;
+register FILE *iop;
+{
+	if(c == EOF)
+		return(EOF);
+	if((iop->_flag & (_IOREAD|_IORW)) == 0)
+		return(EOF);
+
+	if (iop->_base == NULL)  /* get buffer if we don't have one */
+		_findbuf(iop);
+
+	if((iop->_flag & _IOREAD) == 0 || iop->_ptr <= iop->_base)
+		if(iop->_ptr == iop->_base && iop->_cnt == 0)
+			++iop->_ptr;
+		else
+			return(EOF);
+	if (*--iop->_ptr != c) *iop->_ptr = c;  /* was *--iop->_ptr = c; */
+	++iop->_cnt;
+	return(c);
+}