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diff --git a/newlib/libc/stdio/setbuf.c b/newlib/libc/stdio/setbuf.c
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+/*
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/*
+FUNCTION
+<<setbuf>>---specify full buffering for a file or stream
+
+INDEX
+	setbuf
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	void setbuf(FILE *<[fp]>, char *<[buf]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	void setbuf(<[fp]>, <[buf]>)
+	FILE *<[fp]>;
+	char *<[buf]>;
+
+DESCRIPTION
+<<setbuf>> specifies that output to the file or stream identified by <[fp]>
+should be fully buffered.  All output for this file will go to a
+buffer (of size <<BUFSIZ>>, specified in `<<stdio.h>>').  Output will
+be passed on to the host system only when the buffer is full, or when
+an input operation intervenes.
+
+You may, if you wish, supply your own buffer by passing a pointer to
+it as the argument <[buf]>.  It must have size <<BUFSIZ>>.  You can
+also use <<NULL>> as the value of <[buf]>, to signal that the
+<<setbuf>> function is to allocate the buffer.
+
+WARNINGS
+You may only use <<setbuf>> before performing any file operation other
+than opening the file.
+
+If you supply a non-null <[buf]>, you must ensure that the associated
+storage continues to be available until you close the stream
+identified by <[fp]>.
+
+RETURNS
+<<setbuf>> does not return a result.
+
+PORTABILITY
+Both ANSI C and the System V Interface Definition (Issue 2) require
+<<setbuf>>.  However, they differ on the meaning of a <<NULL>> buffer
+pointer: the SVID issue 2 specification says that a <<NULL>> buffer
+pointer requests unbuffered output.  For maximum portability, avoid
+<<NULL>> buffer pointers.
+
+Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
+<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
+*/
+
+#include <_ansi.h>
+#include <stdio.h>
+#include "local.h"
+
+void
+_DEFUN (setbuf, (fp, buf),
+	FILE * fp _AND
+	char *buf)
+{
+  (void) setvbuf (fp, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
+}